SIPROTEC 4 7SA522 Distance Protection Relay for Transmission ...

SIPROTEC 4
7SA522
Distance Protection Relay for
Transmission Lines
Protection Systems
Catalog SIP 4.2 • 1999

SIPROTEC 4
7SA522
Protection Systems
Distance Protection Relay
for Transmission Lines
Description/Overview Pages 2 to 11
Functions Pages 12 to 17
Typical fields application Pages 18 to 20
Firmware V4
Catalog SIP 4.2 • 1999
Technical data Pages 21 to 31
Selection and
ordering data Pages 32 and 33
© Siemens AG 1999
Accessories Page 34
Trip time curves Page 35
Connection diagrams Pages 36 to 41
Advantages to you
Cost-effectiveness,
high degree of automation
User-friendly operation
Low planning and engineering
effort
Fast, flexible mounting,
reduced wiring
Simple, short commissioning
Simple spare part stocking,
high flexibility
High reliability and availability
State-of-the-art technology
Compliance with international
standards
Integration in the overall system
SIPROTEC 4-SICAM-SIMATIC
Dimension drawings Pages 42 to 44

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Description
Application
The 7SA522 relay provides
full scheme distance protection
and incorporates all functions
usually required for the
protection of a power line.
The relay is designed to provide
fast and selective fault
clearance on transmission
and subtransmission overhead
lines and cables. This
contributes towards improved
stability and availability
of your electrical power
transmission system. The power
system star point can
be solid or impedance grounded
(earthed). The 7SA522 is
suitable for single- and
three-phase tripping applications
with and without pilot-
(tele-) protection schemes.
The effect of apparent impedances
in unfaulted fault
loops is eliminated by a
sophisticated and improved
method which uses pattern
recognition with symmetrical
components and load compensation.
The correct phase
selection is essential for selective
tripping and reliable
fault location.
During network power
swings an improved power
swing blocking feature prevents
the distance protection
from unwanted tripping and
optionally provides controlled
tripping in the event of loss
of synchronism (out of step).
This function guarantees power
transmission even under
critical network operating
conditions.
Maximum Lifetime and
Reliability
The 7SA522 hardware is based
on 20 years of experience
by Siemens with numerical
protection. State-of-theart
32 bit microprocessor
technology is employed.
Naturally the device complies
with the latest standards and
techniques for electromagnetic
compatibility. The overall
number of electronic components
is substantially reduced
by using large-scale integrated
circuits.
The relay software is designed
in accordance with high
level programming language
techniques. The long experience
in manufacturing numerical
relays provide the basis
for a modern software structure.
This along with modern
manufacturing techniques
and quality controls ensure
maximum lifetime and reliability.
Cost-effective power
system management
The SIPROTEC 4 units are
numerical relays which also
provide control and monitoring
functions and therefore
support the user in view of a
cost-effective power system
management. They contribute
towards the reliable
supply of electric power to
the customers.
Local operation has been designed
according to ergonomic
criteria. Large, easy-toread
displays are a major design
aim.
The SIPROTEC 4 units have
a uniform design and a degree
of functionality which
represents a whole new
level of quality in protection
and control. If the application
requirements change the
relays may be adapted
quickly by entering new settings
without any additional
hardware costs.
The use of powerful microcontrollers
and the application
of digital measured value
conditioning and processing
largely suppresses the influence
of higher-frequency
transients, harmonics and
DC components.
Back-up protection
The unit can also be used as
backup distance and overcurrent
protection for all types
of differential protection
equipment.
Add-on protective
functions
The 7SA522 incorporates several
protective functions
usually required for transmission
line protection. These
are
− High-resistance earth fault
protection
− Phase overcurrent protection
− STUB bus overcurrent stage
− Overvoltage protection
− Automatic reclosure
− Synchrocheck
− Circuit breaker failure protection.
Programmable logic
The integrated programmable
logic functions allow the
user to implement his own
functions for the automation
of a switchgear (interlocking)
or a substation via a graphic
user interface. The user can
also generate user-defined
messages and logical combinations
of internal or external
signals.
Local and remote
communication
The SIPROTEC 4 units provide
several serial communication
interfaces for various
tasks:
− Front interface for connecting
a PC
− IEC system interface for
connecting to a control
system via
IEC 60870-5-103 or
Profibus-FMS/DP,
Modbus RTU,
DNP3.0
− Prepared for Ethernet
(UCA)
− Modem interface for connecting
a PC via modem
and/or starcoupler
− Time synchronization via
IRIG-B/SCADA (DCF 77)
The 7SA522 relay has two
additional optional interfaces
for communication with the
remote relay or process bus.
It is therefore well prepared
for future communication
standards.
Operational indications
and fault indications with
time stamp
The SIPROTEC 4 units provide
extensive data for fault
analysis as well as control.
All indications listed below
are protected against power
supply failure.
− Fault event record
The last eight fault cases
are always stored in the
unit. All fault recordings
are time stamped with a
resolution of 1 ms.
− Operational indications
All indications that are not
directly associated with
the fault (e.g. operating or
switching actions) are stored
in the status indication
buffer. The time resolution
is 1 ms.
2 Siemens SIP 4.2 · 08/99

Operational measured
values
The large scope of measured
and limit values permits improved
system management
as well as simplified commissioning.
Control
The integrated control functions
permit control of circuit
breakers or isolators (electrically
operated/motorized disconnectors)
via the integrated
operator panel, binary inputs,
DIGSI 4 or the substation
control system (e.g.
SICAM).
A full range of control execution
functions is provided.
Time synchronization
A battery backed clock is always
provided and can be
synchronized via a synchronization
signal (DCF77,
IRIG-B via satellite receiver),
binary input, system interface
or SCADA (e.g. SICAM).
A date and time is assigned
to every indication.
Assignable binary inputs
and outputs
Binary inputs, outputs and
LED’s can be assigned to
perform specific functions as
defined by the user.
Selectable function keys
Four function keys can be assigned
to permit the user to
perform frequently recurring
actions very quickly and
simply.
Typical applications are, for
example, jumps to a given
position in the menu tree in
order to display the list of
operating indications or to
perform automatic functions,
such as ”Switching of circuit-breaker”.
Continuous self-monitoring
The hardware and software
components are continuously
monitored. If abnormal conditions
are detected, the unit
signals them immediately. In
this way, a high level of safety,
reliability and availability is
achieved.
Reliable battery
monitoring
The internal battery is used
to back-up the clock, switching
statistics, status and
fault indications and fault recording
in the event of a power
supply failure. Its function
is checked by the processor
at regular intervals. If
the capacity of the battery is
found to be declining, an
alarm is generated. Routine
replacement is therefore not
necessary. All setting parameters
are stored in the
Flash-EPROM, and therefore
not lost if the power supply
or battery fails.
User-friendly local
operation
Many advantages can already
be found on the clear and
user-friendly front panel:
Positioning and grouping of
the keys support the natural
operating process.
A large non-reflective back-lit
display provides clear
information display.
Programmable (freely assignable)
LED’s for important
messages are provided. Arrow
keys ensure an easy navigation
in the function tree.
Operator-friendly input of the
set values via the numeric
keys or DIGSI 4 is provided as
well as four programmable
keys for frequently used
functions at the push of a button.
Distance
Fault
Locator
Gnd
O/C
Directional
Ground
Overcurrent
STUB
O/C
21
21N
FL
50N
51N
67N
5050N-2
5151N-2
50STUB
52
68
68T
Power
Swing
85-21
Pilot
Dist.
Local/Tele Ctrl.
Commands
CB Indications
Trip Circuit
supervision
27WI 85-67N 50HS 50BF 59 25
Weak
infeed
Lockout
Pilot
Gnd
Operat.
values
Switch
onto-
Flt. O/C
Bkr.
fail.
CFC Logic
Synchrocheck
74TC
Pilot schemes can use
one channel or two
redundant channels to
theremoteend
86
79 Autoreclosure
Overvoltage
Supervision
Note:Pilotschemes=Teleprotection
Serial Communication
Interfaces
Figure 1
Single line diagram
Siemens SIP 4.2 · 08/99 3

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Description
Local operation
All operator actions can be
executed and information
displayed via an integrated
user interface.
Figure 2
Front view SIPROTEC 4 7SA522
On the LCD display,
substation and device information
can be displayed
as text in various lists.
Frequently displayed information
includes measured
analog values, binary information
about the state of the
switchgear and the device,
protection infor- mation, general
indications and alarms.
14 assignable (configurable)
LEDs are used to display
plant or device information.
The LEDs can be labelled
according to user requirements.
An LED reset key resets
the LEDs.
RS232 operator interface
4 configurable function keys
permit the user to execute
frequently used actions simply
and fast. Typical applications
include jumps to certain
points in the menu tree
to display the operational
measured values, or execution
of automatic functions
such as: ”Operate the circuit-breaker”.
Numerical keys for easy data entry
Keys for navigation
4 Siemens SIP 4.2 · 08/99

Description
Connection techniques
and housing with many
advantages
1/2 and 1/1-rack sizes: These
are the available housing
widths of the SIPROTEC 4
7SA522 relays, referred to a
19" module frame system.
This means that previous
models can always be replaced.
The space required in
the switchgear cubicle is the
same. The height is a uniform
243 mm (9.57 inches)
for all housing widths. All
cables can be connected
with or without ring lugs.
Plug-in terminals are available
as an option.
Figure 3
Housing widths 1/2 x 19’‘ and 1/1 x 19’‘
Figure 5
Rear view with terminal covers and
wiring
Figure 4
Rear view with screw terminals and serial
interfaces
Siemens SIP 4.2 · 08/99 5

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
DIGSI 4 Operating Program
DIGSI 4
The PC operating program
DIGSI 4 is the interface between
the user and the
SIPROTEC 4 units. It has a
modern PC operator interface
in accordance with the
Windows ® versions 95/98/
NT4.0. With DIGSI 4 the
SIPROTEC 4 units can be
configured and interrogated -
it is a tailored program for the
electrical supply industries.
Figure 6
DIGSI 4 – Main menu
Figure 7
DIGSI 4 – Device configuration
DIGSI 4 matrix
The DIGSI 4 matrix provides
the user with an overall view
of the unit configuration at a
glance. For example, all LEDs
and the configuration of the
binary inputs and output relays
are displayed in a single
chart. And with one click of
the mouse button connections
can be made.
Figure 8
DIGSI 4 – Configuration matrix
6 Siemens SIP 4.2 · 08/99

DIGSI 4 Operating Program
Convenient protection
functions setting:
Secondary or Primary
The settings can be entered
and displayed as secondary
or primary values. Switching
between secondary and primary
is done by clicking on
the corresponding symbol in
the tool bar.
Commissioning
Special attention has been
paid to commissioning. All
binary inputs and output contacts
can be displayed and
activated directly. This can
simplify the wiring check
significantly for the user.
CFC: Programming logic
With the help of the CFC graphic
tool (Continuous Function
Chart) interlocks and
switching sequences can be
configured simply via drag
and drop of logic symbols; no
special knowledge of software
is required. Logical elements,
such as AND, OR,
flip-flops and timer elements
are available. The user can
also generate user-defined
annunciations and logical
combinations of internal or
external signals.
Figure 9
CFC (Continuous Function Chart)
The new DIGSI 4
Easy to learn
Clear layout of routing matrix
Substation, feeder and equipment
data management
Password protection
Linked with the SICAM/SIMATIC
software environment
Windows standards
Siemens SIP 4.2 · 08/99 7

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
System SIPROTEC 4/SICAM
SIPROTEC 4 as an integral part
of SICAM energy automation
system
SIPROTEC 4 is tailor-made for use
in the SIMATIC-based SICAM
energy automation system. The
SICAM family consists of the following
components:
− SICAM RTU, the modern telecontrol
system with automation
and programmable logic functions
− SICAM SAS, the modern integration
of switchgear automation
and information technology
− SICAM PCC, the information
and communication technology
on a PC basis
Database
SICAM WinCC
DIGSI 4
SICAM plusTOOLS
Bay control units
SICAM/SIPROTEC 4
Software
Data
management
Communication
Various communication
protocols
SCADA
CPU
Central I/O
Protection devices
Data management and communication
is one of the strong points
of the SICAM and SIPROTEC 4
system. Powerful engineering
tools (SICAM plus TOOLS based
on STEP7 and SICAM Win CC)
make working with SICAM convenient.
The SIPROTEC 4 units
are optimally matched for use in
SICAM SAS and SICAM PCC.
With SICAM and SIPROTEC 4
continuity exists at three central
points:
− Data management
− Software architecture
− Communication.
Figure 10
SICAM/SIPROTEC 4 architecture
IEC 60870-5-103/Profibus-FMS
Rear of unit
SIPROTEC 4
Front interface
Service
Bus
Rear of unit
SIPROTEC 4
Front interface
Systems
control
Rear of unit
SIPROTEC 4
Front interface
Office
Modem
access
All central system components
(SICAM and SIPROTEC 4 CPUs,
SICAM WinCC, SICAM plus
TOOLS, bay controllers and protection
equipment), as well as the
DIGSI 4 operating program, are
established on the same basis.
The ability to link SICAM/SIPRO-
TEC and other components of the
substation control, protection and
automation is assured via open
interfaces, such as
IEC 60870-5-103 or PROFIBUS.
Service interface
The service interface can be used
asa2 nd operating interface.
DIGSI 4 offers the additional possibility
of accessing bay controllers
via modem. Thus the full
range of DIGSI 4 functionality is
available at the office desk or
when travelling (by laptop and modem).
This permits rapid and extensive
access for the service personnel.
All settings and control
commands are available and it is
possible to read the operational
and fault event logs, fault records
as well as ope- rational measured
values.
Figure 11
Systems control bus and service bus
Star coupler
All SIPROTEC units operate also
with the proven star coupler. The
star coupler is used for simple
applications which also give the
user an alternative method of
retrieving information remotely.
Service vehicle
8 Siemens SIP 4.2 · 08/99

SIPROTEC 4/SICAM system
SICAM WinCC
Operation and monitoring
archive, configuration station
Telecontrol interafce to
system control centers
(e.g. IEC 60870-5-101)
Automation
systems
(e.g. SIMATIC)
Time synchronisation
DCF77, GPS
DIGSI 4
SICAM SC
IEC 60870-5-103
Profibus FMS
IEC 60870-5-103
2) 2) 1) 2) 1) 2)
1)
6MD63
Protection
Protection/control
Control
7SJ61/62
7SJ61/62 6MD/7SJ63 6MB525 7SJ61/62 6MD63 7SJ63
1) Protection and control 2) Protection and control
in seperate units.
in one unit.
7SJ600
7SA511
7UT51
SD51
7SJ51
6MB525
Figure 12
SICAM SAS communication structure
Figure 13
Communication via star coupler
Siemens SIP 4.2 · 08/99 9

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Communication
Digital communication
With respect to communication,
particular emphasis is
placed on the customer requirements
in energy automation:
− Every data item is timestamped
at the source, i.e.
where it originates.
− The communication system
automatically handles
the transfer of large data
blocks (e.g. fault recordings
or parameter data
files). The user has access
to these features without
any additional programming
effort.
− For the safe execution of a
control command the corresponding
data telegram
is initially acknowledged by
the device which will execute
the command. After
the release and execution
of the command a feedback
signal is generated.
At every stage of the control
command execution
particular conditions are
checked. If these are not
satisfied, command execution
may be terminated in a
controlled manner.
Local PC interface
The PC interface accessible
from the front of the unit permits
quick access to all parameters
and fault event data.
The use of the DIGSI 4 operating
program is particularly
advantageous during commissioning.
Remote relay interface (**)
Most pilot- (tele-) protection
schemes could be implemented
using digital serial communication.
The 7SA522 is
capable of remote relay
communication via direct
links or multiplexed digital
communication networks.
Safe bus architecture for
substation control
interface
RS485 bus
With this data transmission
via copper conductors,
electromagnetic fault influences
are largely eliminated
(*) available with next firmware release
(**) in preparation
1) Optical Link Module
by the use of twisted-pair
conductors. Upon failure of
a unit, the remaining system
continues to operate
without any problem.
Fiber optic double ring
circuit
The fiber optic double ring
circuit is almost immune to
electromagnetic interference.
Upon failure of a section
between two units, the
communication system continues
to operate without
disturbance. It is generally
impossible to communicate
with a unit that has failed. If
a unit were to fail, there is
no effect on the communication
with the rest of the
system.
Retrofitting: Modules for
every type of communication
Communication modules are
available for the entire
SIPROTEC 4 unit range. This
ensures that a range of communication
protocols can be
used. No external converter
is required.
IEC 60870-5-103
IEC 60870-5-103 is an internationally
standardized protocol
for efficient communication
with protection relays. IEC
60870-5-103 is supported by
a number of protection device
manufacturers and is
used world-wide.
PROFIBUS-FMS (*)
PROFIBUS-FMS is an internationally
standardized communication
system (EN 50170)
for communication problem
solving. Profibus is supported
internationally by several
hundred manufacturers and
has to date been used in
more than 1,000,000 applications
all over the world.
Connection to a SIMATIC
S5/S7 programmable controller
is made on the basis of
the data obtained (e.g. fault
recording, fault data, measured
values and control functionality)
via the SICAM
energy automation system.
Figure 14
IEC 60870-5-103 star type RS232 copper conductor connection or fiber
optic connection
Figure 15
Profibus: Optical double ring circuit
OLM 1)
Figure 16
Profibus: RS485 copper conductor connection
10 Siemens SIP 4.2 · 08/99

Communication
Profibus DP (*)
Profibus DP is an industrial
communications standard
and is supported by a
number of PLC and protection
device manufacturers.
Modbus RTU (*)
Modbus RTU is a recognized
industrial communications
standard and is supported by
a number of PLC and protection
device manufacturers.
DNP 3.0 (*)
DNP 3.0 (Distributed Network
Protocol version 3) is a
communications protocol
based on messages. The
SIPROTEC 4 units are fully
Level 1 and Level 2 compliant
with DNP 3.0. DNP 3.0 is
supported by a number of
protection device manufacturers.
Figure 17
Optical fiber communication module
Ethernet UCA (**)
UCA (Utility Communications
Architecture) is a developing
communications protocol
specifically designed for substation
automation. When it
becomes an international
standard, the SIPROTEC 4
units are prepared to support
it. Simply plug in a new communication
module.
Figure 18
RS232/RS485 electrical communication module
Figure 19
Fiber optical double ring communication module
(*) available with next firmware release
(**) in preparation
Siemens SIP 4.2 · 08/99 11

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Functions
Distance protection
(ANSI 21, 21N)
Full-scheme design
The main function of the
7SA522 is a full-scheme distance
protection. By parallel
calculation and monitoring of
all six impedance loops a
high degree of sensitivity and
selectivity is achieved for all
types of faults. The shortest
tripping time is less than one
cycle. Single- and three- pole
tripping is possible.
MHO and quadrilateral
characteristics
The 7SA522 relay provides
quadrilateral as well as MHO
zone characteristics. Both
characteristics can be used
separately for phase and
ground faults. Resistance
ground faults can for instance
be covered with the
quadrilateral characteristic
and phase faults with the
mho characteristic.
Load bias
In order to guarantee a reliable
discrimination between
load operation and short circuit
– especially on long high
loaded lines – the relay is
equipped with a selectable
load encroachment characteristic.
Impedances within this
load encroachment characteristic
will prevent the distance
zones from unwanted
tripping.
Absolute phase-selectivity
The 7SA522 distance protection
incorporates a well proven
highly sophisticated phase
selection algorithm. The
pickup of unfaulted loops is
eliminated to prevent the
adverse influence of currents
and voltages in the fault free
loops. This phase selection
algorithm achieves single
pole tripping and correct distance
measurement in a
wide application range.
Parallel line compensation
The influence of wrong distance
measurement due to
parallel lines can be compensated
by feeding the neutral
current of the parallel line to
the relay. Parallel line compensation
can be used for distance
protection as well as
for the fault locator.
6 zone packages
Five independent distance
zones and one separate
overreach zone for zone
extension schemes are
available. Each distance zone
has separate time stages,
partly valid for single phase
or multi-phase faults.
Ground faults are detected
by monitoring the neutral
current 3I 0 and the zero sequence
voltage 3V 0 .
Quadrilateral
The quadrilateral tripping
characteristic permits separate
setting of the reactance
X and the resistance R. The
resistance section R can be
set separately for faults with
and without ground involvement.
This characteristic has
therefore an optimal performance
in case of faults with
fault resistance. The distance
zones can be set forward, reverse
or non-directional.
Sound phase polarization and
voltage memory provides a
dynamically unlimited directional
sensitivity.
MHO
The mho tripping characteristic
provides sound phase respectively
memory polarization
for all distance zones.
The example in figure 21
shows the characteristic for a
forward fault where the mho
circle expands to the source
impedance but never more
than the selected impedance
reach. This mho circle expansion
guarantees safe and selective
operation for all types
of faults even for close-in
faults.
Insensitive to measuring
value distortion
Digital filtering of the
measured values makes the
protection unit insensitive to
disturbances in the measured
quantities. In particular
the influence of DC components,
capacitive voltage
transformers and frequency
changes are reduced.
reverse
Load
forwards
Z3
Figure 21
Distance protection: MHO characteristic
X
ϕ
Line
Z2
Z1B
α
Z1
reverse
Figure 20
Distance protection: quadrilateral characteristic
Load
X
Z3 (if revers)
Fuse failure monitoring
The loss of the secondary
V.T. circuit voltage blocks the
distance protection
automatically and prevents
the relay from unwanted
tripping. The secondary V.T.
voltage is supervised by the
integrated fuse failure
monitor. A pickup of the fuse
failure monitor as well as the
ϕ
Z1
Line
Z2
Z4
Z1B
Z5
Z4
Z5
Load
forwards
Load
V.T.-mcb binary input block
the distance protection and
can activate the backup
overcurrent protection.
R
R
12 Siemens SIP 4.2 · 08/99

Functions
Fault locator
The integrated fault locator calculates
the fault impedance
and the distance-to-fault. The
result is displayed in ohms, miles,
kilometers or in percent of
the line length. Parallel line and
load current compensation is
also available.
Power swing detection
(ANSI 68, 68T)
Dynamic occurrences, for instance
short circuits, load fluctuations,
autoreclosures or
switching operations can cause
power swings in the transmission
network. During power
swings, large currents along
with small voltages can cause
unwanted tripping of distance
protection relays. To avoid uncontrolled
tripping of the distance
protection and to achieve
controlled tripping in the event
of loss of synchronism the
7SA522 relay is equipped with
an efficient power swing detection
function. Power swings
can be detected under symmetrical
load conditions as well as
during single pole autoreclosures.
Pilot- (Tele-) protection for
distance protection
(ANSI 85-21)
A pilot protection function is
available for fast clearance of
faults up to 100% of the line
length. The following operating
modes may be selected:
− PUTT, permissive underreaching
zone transfer trip
− POTT, permissive overreaching
zone transfer trip
− UNBLOCKING
− BLOCKING
− DUTT, direct underreaching
zone transfer trip (together
with Direct Transfer Trip
function)
The carrier send and receive
signals are available as binary
inputs and outputs and can be
assigned freely to each physical
relay input or output. At
least one channel is required
for each direction.
Common transmission channels
are power-line carrier, microwave
radio and fiber-optic
links.
Figure 22
Power swing current and voltage wave forms
A serial remote relay interface
is in preparation for direct connection
to a digital communication
network
7SA522 also permits the transfer
of phase-selective signals.
This function requires three
channels for each direction.
This feature is particularly advantageous
as it permits to
execute reliable single-pole tripping,
even if two single-phase
faults occur on different lines.
The transmission methods are
suitable also for lines with three
ends (three-terminal lines). Phase-selective
transmission is
also possible with multi-end
applications, if some user specific
linkages are implemented
by way of the integrated CFC
LOGIC. During disturbances in
the transmission receiver or on
the transmission circuit, the pilot
protection function can be
blocked by a binary input signal
without loosing the zone selectivity.
The control of the overreach
zone Z1B (zone extension -
can be switched over to the autoreclosure
function. A transient
blocking function (Current
reversal guard) is provided to
overcome current reversals resulting
from the clearance of
short circuits on parallel lines.
Figure 23
Power swing circle diagram
Direct transfer tripping
There are various conditions
on the power system which
necessitate the remote tripping
of the circuit breaker
from the protection position.
The 7SA522 relay is equipped
with phase-selective intertripping
signal inputs and
outputs.
Siemens SIP 4.2 · 08/99 13

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Functions
Weak infeed protection:
echo and/or trip
(ANSI 27 WI)
To prevent delayed tripping
of permissive schemes
during weak or zero infeed
situations, an echo function
is provided. If no fault
detector is picked up at the
weak infeed end of the line,
the signal received here is
returned as echo to allow
accelerated tripping at the
strong infeed end of the line.
It is also possible to initiate
tripping at the weak infeed
end. A phase-selective 1-pole
or 3-pole trip is issued if a
permissive trip signal (POTT
or Unblocking) is received
and a if the phase-ground
(earth) voltage drops correspondingly.
Directional ground (earth)
fault overcurrent protection
for high-resistance
faults
(ANSI 50N, 51N, 67N)
In grounded (earthed) networks
the sensitivity of the
ground distance protection
may not cover ground faults
with high fault resistances.
The 7SA522 protection relay
has therefore protection
functions for high-resistance
ground faults of this nature.
The ground fault overcurrent
protection can be used with
3 definite time stages and
one inverse time stage
(IDMT). A 4 th definite time
stage can be applied instead
of the one inverse time
stage.
The available ANSI/ IEEE inverse-time
curves are:
• Inverse
• Short inverse
• Long inverse
• Moderately inverse
• Very inverse
• Extremely inverse
• Definite inverse
An additional logarithmic inverse
time characteristic is
also available.
The direction decision is performed
with the neutral current
and the zero sequence
voltage or with the negative
sequence components V2
and I2. In addition or as an
alternative to the directional
determination with zero
sequence voltage, the starpoint
current of a grounded
power transformer may also
be used for polarization. Dual
polarization applications can
therefore be fulfilled. Each
overcurrent stage can be set
in forward or reverse direction
or for both directions
(non-directional).
As an option the 7SA522
relay can be provided with a
sensitive neutral (residual)
current transformer. This
feature provides a measuring
range for the neutral (residual)
current from 5mA to 100A
with a nominal relay current
of 1A and from 5 mA to 500A
with a nominal relay current
of 5A. Thus the ground fault
overcurrent protection can be
applied with extreme
sensitivity.
The function is equipped
with special digital filter algorithms,
providing the elimination
of higher harmonics.
This feature is particularly important
for low zero sequence
fault currents which usually
have a high content of 3 rd
and 5 th harmonic. Inrush stabilization
and instantaneous
switch-onto-fault trip can be
activated separately for each
stage as well.
Different operating modes
can be selected. The ground
fault protection may be
blocked during the dead time
of single-pole autoreclose cycles
or during pickup of the
distance protection.
Pilot protection for
directional ground (earth)
fault protection
(ANSI 85-67N)
The directional ground fault
overcurrent protection can be
combined with one of the following
pilot schemes:
• Directional comparison
• BLOCKING
• UNBLOCKING.
The transient blocking function
(current revresal guard)
is also provided to overcome
current reversals resulting
from the clearance of short
circuits on parallel lines.
The pilot functions for distance
protection and for
ground (earth) fault protection
can use the same signalling
channel or two separate
and redundant channels.
Backup overcurrent
protection
(ANSI 50, 50N, 51, 51N)
The 7SA522 provides a
backup overcurrent protection.
Two definite time
stages and one inverse time
stage (IDMTL) are available,
separately for phase currents
and for the neutral (residual)
current. Two operating
modes are selectable. The
function can run in parallel to
the distance protection or
only during interruption of
the voltage in the secondary
VT circuit (emergency operation).
The secondary voltage interruption
can be detected by
the integrated Fuse Failure
monitor or via a binary input
Figure 24
Normal inverse
of a VT miniature circuit
breaker (VT m.c.b. trip).
The available ANSI/ IEEE inverse-time
curves are:
• Inverse
• Short inverse
• Long inverse
• Moderately inverse
• Very inverse
• Extremely inverse
• Definite inverse
STUB bus overcurrent
protection
(ANSI 50(N)-STUB)
The STUB bus overcurrent
protection is a separate
definite time overcurrent
stage. It can be activated
from a binary input signalling
the open line isolator (disconnector).
Settings are available for
phase and ground (earth)
faults.
t =
( I / I
P)
014 .
⋅ T
002 .
P
− 1
14 Siemens SIP 4.2 · 08/99

Functions
Instantaneous high-speed
switch-onto-fault overcurrent
protection
(ANSI 50HS)
Instantaneous tripping is possible
when energizing a faulty
line. On definite large-fault
currents, the high-speed
switch-onto-fault overcurrent
stage can initiate very fast 3-
pole tripping.
With lower fault currents, instantaneous
tripping after
switch-onto-fault is also possible
with the overreach distance
zone Z1B or just with
pickup in any zone.
The switch-onto-fault initiation
can be detected via the
binary input ”manual close”
or automatically via measurement.
Overvoltage protection
(ANSI 59)
Impermissible overvoltages
can occur on long transmission
lines without or with low
load. The 7SA522 protection
relay contains an overvoltage
protection function. Two stages
are available: One phasesegregated
stage and one
zero-sequence voltage stage.
The residual voltage from a
broken-delta VT winding can
be directly measured via the
V4-voltage transformer input
(Ven-voltage) or can be
calculated internally as 3V 0 .
Tripping can be performed at
the local circuit breaker or at
the remote end of the line by
sending an intertripping signal.
Breaker failure protection
(ANSI 50BF)
The 7SA522 relay incorporates
a two-stage circuit-breaker
failure protection to detect
failures of tripping commands
execution, for example
due to a defective circuitbreaker.
The current detection
logic is phase-segregated
and can therefore also be
used in single-pole tripping
schemes. If the fault current
has not been interrupted after
a settable time delay is
expired, a retrip command or
the busbar trip command is
generated. The breaker failure
protection can be initiated
by all integrated protection
functions as well as by external
devices via binary input
signals.
Automatic reclosing
(ANSI 79)
The 7SA522 relay is equipped
with an automatic reclosing
function (AR). The function
includes several operating
modes:
• 3-pole auto reclosing for all
types of faults; different
dead times are available depending
the type of fault
• 1-pole auto reclosing for 1-
phase faults, no reclosing
for multi-phase faults
• 1-pole auto reclosing for 1-
phase faults and for 2-phase
faults without earth, no -
reclosing for multi-phase
faults
• 1-pole auto reclosing for 1-
phase and 3-pole auto reclosing
for multi-phase faults
• 1-pole auto reclosing for 1-
phase faults and 2-phase
faults without earth and 3-
pole auto reclosing for other
faults
• Multiple-shot auto reclosing
• Interaction with an external
device for automatic reclosing
via binary inputs and
outputs
• Control of the integrated AR
function by external protection
• Interaction with the internal
or an external synchronism
check
• Monitoring of the circuitbreaker
auxiliary contacts
• Voltage check for discrimination
between successful
and non-successful reclose
attempts
In addition to the above mentioned
operating modes, several
other operating principles
can be performed by
means of the integrated programmable
logic (CFC).
Synchronism check
(ANSI 25)
The synchronism and voltage
check function will ensure
that the stability of the network
will not be endangered
when a line is switched onto
a busbar. For this purpose a
synchronism check function
is provided. After verification
of the network synchronism
the function enables the
CLOSE command. Alternatively
reclosing can be enabled
for different criteria, e.g.
checking that the busbar or
line is not carrying a voltage
(dead line or dead bus).
Fuse-failure monitoring
and other supervision
functions
The 7SA522 relay provides
comprehensive monitoring
functions covering both hardware
and software. Furthermore,
the measured values
are continuously checked for
plausibility. Thus the current
and voltage transformers are
also included in this monitoring
system.
If any measured voltage is
not present due to short circuit
or conductor breakage in
the voltage transformer secondary
circuit the distance
protection would react in an
unwanted trip due to this
loss of voltage. This secondary
voltage interruption can be
detected by means of the integrated
Fuse-failure monitor.
Immediate blocking of distance
protection and switching
to the backup-emergency
overcurrent protection
is provided for all types of secondary
voltage failures.
Additional measurement supervision
functions are
• Balance of voltages and currents
• Broken-conductor supervision
• Summation of currents and
voltages
• Phase-sequence supervision
Trip circuit supervision
(ANSI 74TC)
One or two binary inputs for
each circuit breaker pole can
be used for monitoring the
circuit-breaker trip coils including
the connecting cables.
An alarm signal is issued
whenever the circuit is interrupted.
Lockout (ANSI 86)
A given tripping command
can be held until it is reset
via a binary input. Thereby
the circuit breaker can be
locked to prevent restarting
until the cause of the disturbance
is clarified. The lockout
state can be removed by
conscious manual resetting.
A prerequisite is that the
close coil — as usual — at
the circuit breaker is locked
with pending tripping command.
Siemens SIP 4.2 · 08/99 15

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Functions
Measured values
The RMS values are
calculated from the acquired
current and voltage signals
along with the power factor,
the frequency, the real and
reactive power. Measured
values are displayed as primary
or secondary values or
in percent of the specific line
nominal current and voltage.
The following values are
available for measured value
processing:
• Currents 3x I phase ,3I 0 , I G ,
3I0 par
• Voltages 3x V phase-ground ,3x
V phase-phase ,3V 0 ,V en ,V sync
• Symmetrical components
I 1 , I 2 ,V 1 ,V 2
• Real power P (Watt),
Reactive power Q (Var),
Apparent power S (VA)
• Power factor PF (= cosϕ)
• Frequency f
• Load (in service) impedances,
primary and secondary
3x (R phase-ground ,X phase-ground ) ,
3x (R phase-phase ,X phase-phase )
• Limit-value monitoring
Limit values are monitored
by means of the CFC. Commands
can be derived from
this limit value indication.
Commissioning and test
functions
Special attention has been
paid to commissioning. All binary
inputs and outputs can
be displayed and set directly.
This can simplify the wiring
check process significantly
for the user.
The measured values can be
displayed via DIGSI 4 on the
PC screen as primary, secondary
and/or percentage values
simultaneously. This provides
a complete overview of
the actual system conditions.
• The 7SA522 provides a circuit
breaker test function.
Single- and three pole tripping
commands can be generated
manually followed by
a reclosing command. The
pole open time can be set
separately to the auto reclosing
dead time.
4 predefined setting
groups
The settings of the 7SA522
relay can be adapted quickly
to suit changing network
configurations. The relay
includes 4 setting groups
which can be predefined
during commissioning or
even changed by remote via
a DIGSI 4 modem link. The
setting groups can be
activated via binary inputs,
via DIGSI 4 (local or remote),
via the integrated keypad or
via the serial substation
control interface.
Operational measured values are clearly
arranged on the LCD display
Some fault indications are displayed
automtically on the LCD display
Region-specific default
settings
The SIPROTEC 4 relays
7SA522 can be supplied in
regional versions. The user
purchases only the functions
required. The available functions
are matched to the technical
requirements of the regions
(see table).
Function Region World Region US Region GE
Frequency
50 Hz/60 Hz
Line length
km/miles
Inverse-time characteristic
for backup overcurrent
preset to 50 Hz preset to 60 Hz preset to 50 Hz
preset to km preset to miles preset to km
IEC, ANSI 1)
preset to IEC
ANSI 1)
IEC
Inverse-time characteristic
for ground (earth) overcurrent
IEC, ANSI 1) , ANSI 1)
Logarithmic inverse
preset to IEC
IEC
STUB-Bus overcurrent stage –
1)
Disc-emulation with inverse time characteristic is generally combined with ANSI curves
16 Siemens SIP 4.2 · 08/99

Control and automatic functions
Control
In addition to the protection
functions, the SIPROTEC 4
units also support all control
and monitoring functions required
for operating mediumvoltage
or high-voltage substations.
The main application
is reliable control of
switching and other processes.
The status of primary
equipment or auxiliary devices
can be obtained from
auxiliary contacts and communicated
to the 7SA522 via
binary inputs. Therefore it is
possible to detect and indicate
both the OPEN and
CLOSED position or a faulty
or intermediate circuit-breaker
or auxiliary contact position.
The switchgear or circuit-breaker
can be controlled
via:
− integrated operator panel
− binary inputs
− substation control system
− DIGSI 4.
Automation
With the integrated logic, the
user can set specific functions
for the automation of
the switchgear or substation
by means of a graphic interface
(CFC). Functions are activated
by means of function
keys, binary inputs or via the
communication interface.
Switching authority
The following hierarchy of
switching authority is applicable:
”LOCAL”, DIGSI 4 PC
program, ”REMOTE”. The
switching authority is determined
according to parameters
or by DIGSI 4. If the
”LOCAL” mode is selected,
only local switching operations
are possible. Every
switching operation and
change of breaker position is
stored in the status indication
memory. The switch
command source, switching
device, cause (i.e. spontaneous
change or command)
and result of a switching
operation are retained.
Command processing
The 7SA522 offers all functions
required for command
processing, including the
processing of single and
double commands with or
without feedback as well as
sophisticated monitoring of
the control hardware and
software. Control actions
using functions such as runtime
monitoring and automatic
command termination
after output check of the external
process are also provided
by 7SA522. Typical
applications are:
• Single and double commands
using 1, 1 plus 1
common or 2 trip contacts
• User-definable bay interlocks
• Operating sequences combining
several switching
operations such as control
of circuit-breakers, isolators
(disconnector switches) and
earthing switches
• Derived triggering of switching
operations, indications
or alarms by logical combination
of existing information.
Assignment of command
feedback
The positions of the circuitbreaker
or switching devices
are captured by feedback.
These indication inputs are
logically assigned to the corresponding
command outputs.
The unit can therefore
distinguish whether the indication
changes as a consequence
of switching operation
or due to a spontaneous
change of state (intermediate
position).
Figure 25
Chatter disable
The chatter disable feature
evaluates whether the number
of status changes of an
indication input exceeds a
specified figure in a configured
period of time. If so, the
indication input is blocked for
a certain period, so that the
event list will not record excessive
operations.
Filter time
All binary control indications
can be subjected to a filter
time (indication delay) to
prevent spurious operation.
Indication filtering and
delay
Indications can be filtered or
delayed. Filtering serves to
suppress brief changes at
the indication input. The indication
is passed on only if
the indication voltage is still
present after a set period of
time. In the case of indication
delay, there is a delay for a
preset time. The information
is passed on only if the indication
voltage is still present
after this time.
Indication derivation
A further indication (or a
command) can be derived
from an existing indication.
Group indications can also be
formed. The volume of information
to the system interface
can thus be reduced and
restricted to the most important
signals.
Data transmission lockout
A data transmission lockout
can be activated, so as to
prevent transfer of information
to the control center
during work on a circuit bay.
Test mode
During commissioning a test
mode can be selected; all
indications then have a test
mode suffix for transmission
to the control system.
Siemens SIP 4.2 · 08/99 17

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Typical connections
Typical connection of
current and voltage
transformers
The typical AC connection has
3 phase current transformers
and 3 phase-ground (earth)
voltage transformers. The
neutral (residual) current (I N =
3I 0 ) is measured via the I4-
current transformer as the
sum of the three phase currents.
The zero sequence voltage
3V 0 is not measured externally
but calculated by the
microprocessor.
A (L1)
B (L2)
C (L3)
52
Circuit
breaker
I N
V N
Flush mounting
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
R15
R16
R17
R18
Busbar
I A(L1)
I B(L2)
I C(L3)
V A(L1)
V B(L2)
I 4
V 4
V C(L3)
R13
R14
Line
Figure 26
Voltage transformer connections:
Separate open
delta transformer
The three phase-to-ground
(earth) voltage transformers
are typically connected as illustrated.
The V4 voltage
transformer measures the
zero sequence voltage 3V 0
(Ven) via a separate VT (open
delta connection). This ensures
an additional voltage supervision.
The V4 transformer can also
be connected to a separate
voltage transformer for free
assignable voltage measurement
(Vx).
A (L1)
B (L2)
C (L3)
Circuit
breaker
52
R15
R16
R17
R18
R13
R14
V A(L1)
V B(L2)
V C(L3)
V 4
Busbar
Line
Figure 27
18 Siemens SIP 4.2 · 08/99

Typical connections
VT connection to the
busbar
The three phase-to-ground
(earth) voltage transformers
are connected typically. The
V4 voltage transformer is connected
to a busbar VT for synchronism
check and/or voltage-supervised
automatic reclosing.
Any phase-to-phase
or phase-to-ground (earth) voltage
can be used for busbar
voltage sensing.
A (L1)
B (L2)
C (L3)
Busbar
R15
R16
R17
V A(L1)
V B(L2)
R18
V C(L3)
Circuit
breaker
52
R13
R14
V 4
Line
Figure 28
Mutual parallel line
compensation
The three-phase current transformers
are typically connected
as illustrated. The I4-CT is
connected to the neutral (residual)
current of the parallel
line for mutual parallel line
compensation.
A (L1)
B (L2)
C (L3)
Busbar
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
I A(L1)
I B(L2)
I C(L3)
I 4
52
Circuit
breaker
52
Circuit
breaker
Line
Parallel line
Figure 29
Siemens SIP 4.2 · 08/99 19

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Typical connections
Additional polarizing for
directional ground- (earth)
fault protection
The three-phase current transformers
are typically connected
as illustrated. The I4-CT is
connected as polarizing current
to a grounded (earthed)
power transformer. This
ensures dual polarization for
the directional ground- (earth)
fault protection
(ANSI 67N).
A (L1)
B (L2)
C (L3)
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
I A(L1)
I B(L2)
I C(L3)
I 4
Busbar
52
Circuit
breaker
Figure 30
Separate neutral (residual)
current measurement
The three-phase current transformers
are connected typically.
The starpoint points in
line direction. The I4-CT is
connected to a separate neutral
(residual) current CT, thus
permitting a high sensitive 3I 0
measurement for high resistance
ground (earth) faults.
A (L1)
B (L2)
C (L3)
Q1
Q2
Q3
Q4
Q5
Q6
Q7
I A(L1)
I B(L2)
I C(L3)
Busbar
Note: Terminal Q7 must be
connected to that CT terminal
pointing in the same direction
as the starpoint of the phase
current CTs.
52
Circuit
breaker
Q8 I 4
Flux balancing or
other neutral CT
Figure 31
20 Siemens SIP 4.2 · 08/99

Technical Device Data
Analog input circuits
Rated frequency
Rated current I nom
Rated voltage
Power consumption
in CT circuits with I nom = 1A
in CT circuits with I nom = 5A
in the CT circuit for high sensitive ground (earth)
fault protection (refer to ordering code) at 1A
in VT circuits
Thermal overload capability
in CT circuits
in the CT circuit for high sensitive ground (earth)
fault protection (refer to ordering code)
in VT circuits
Dynamic overload capability
in CT circuits
in the CT circuit for high sensitive earth fault
protection (refer to ordering code)
50Hz or 60Hz (selectable)
1 A or 5 A (selectable)
80 V to 125 V (selectable)
approx. 0.05 VA
approx. 0.30 VA
approx. 0.05 VA
approx. 0.1VA
100 x I Nom for1s
30 x I Nom for 10 s
4xI Nom continuous
300 A for 1 s
100 A for 10 s
15 A continuous
230 V continuous per phase
250 x I Nom (one half cycle)
Power Supply
Rated auxiliary voltage
24 V to 48 V DC
60Vto125VDC
110Vto250VDC
and 115 V AC with 50 Hz / 60 Hz
Permitted tolerance of the rated auxiliary voltage -20% to +20%
Max. superimposed AC voltage (peak to peak) ≤ 15%
Power consumption
during normal operation
approx. 8 W
during pickup with all inputs and outputs activated approx. 18 W
Bridging time during auxiliary voltage failure
Vaux ≥ 110 V
≥ 50 ms
Binary Inputs
Quantity
Function can be assigned
Minimum operating voltage
Range is selectable with jumpers for each
binary input
Maximum operating voltage
Current consumption, energized
8 or 16 or 24 (refer to ordering code)
17 V or 73 V or 154 V DC, bipolar
(3 operating ranges)
300 V DC
approx. 1.8 mA
Output contacts
Quantity
Function can be assigned
Switching capacity
make
break
break (for resistive load)
break (for τ = L/R ≤ 50 ms)
Switching voltage
Permissible current
8 or 16 or 24 (refer to ordering code)
1000 W/VA
30 VA
40 W
25 VA
250 V
30 A for 0.5 s
5 A continuous
LED displays
Quantity
RUN (green) 1
ERROR (red) 1
Indication (red), function can be assigned 14
Siemens SIP 4.2 · 08/99 21

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Technical Device Data
Mechanical construction
Housing
7XP20
Dimension 1/2 x 19’‘ or 1/1 x 19’‘
refer to ordering code and see dimension drawings
Degree of protection to EN 60 529
For the front of the housing IP 51
For the rear of the housing
flush mounting version IP 50
surface mounting version IP 51
For the terminals
IP 2x with terminal cover put on
Weight
Flush mounting
1/2 x 19‘’ 6 kg
1/1 x 19’‘ 10 kg
Surface mounting
1/2 x 19‘’ 11 kg
1/1 x 19’‘ 19 kg
Serial interface / front of unit
Operating interface 1 for DIGSI 4
Connection non isolated, RS 232,
front panel, 9-pin subminiature connector
Baud rate
4800 Baud to 115200 Baud
Serial interfaces / rear of unit
Time synchronization
with IRIG-B signal / DCF77 / SCADA or binary input
impulse
Connection
9-pin subminiature connector
Voltage levels
5 V or 12 V or 24 V
Service interface (refer to ordering code) for DIGSI 4 / Modem / Service
(Operating interface 2) Isolated RS232/RS485 9-pin subminiature connector
Dielectric test
500 V/ 50 Hz
Distance for RS232
max. 15 m
Distance for RS485
max. 1000 m
Fiber-optic
integrated ST-connector
Optical wavelength
λ=820 nm
Permissible attenuation
max. 8dB for glass-fiber 62.5/125µm
Distance
max. 1.5 km
System interface (refer to ordering code) IEC60870-5-103
Profibus FMS (*)
Profibus DP (*)
Modbus RTU (*)
DNP 3.0 (*)
Isolated RS232/RS485
9-pin subminiature connector
Baud rate
4800 Baud to 38400 Baud
Dielectric test
500 V/50HZ
Distance for RS232
max. 15 m
Distance for RS485
max. 1000m
Profibus RS485
Dielectric test
500 V/50Hz
Baud rate
max. 12 MBaud
Distance
1000 m at 93.75 kBaud; 100 m at 12MBaud
Fiber-optic
integrated ST-connector
single or double ring
Baud rate
max. 1.5 Mbaud
Optical wavelength
λ = 820nm
Permissible attenuation
max. 8dB for glass-fiber 62.5/125µm
Distance
max. 1.5 km
Remote Relay interfaces Quantity max. 2 (**)
*) available with next firmware release
**) in preparation
22 Siemens SIP 4.2 · 08/99

Technical Device Data
Electrical tests
Standards
IEC 60255 (product standards)
ANSI/IEEE C37.90.0/.1/.2
UL 508
For further regulations see “Individual functions”
Insulating tests
Standards IEC 60255-5
Voltage test (100% test)
All circuits except for auxiliary supply, binary inputs
and communication interfaces
Auxiliary voltage and binary inputs (100% test)
RS485/RS232 rear side communication interfaces
and time synchronization interface (100% test)
Surge voltage test (type test)
All circuits except for communication interfaces
and time synchronization interface, class III
2,5 kV (rms.), 50Hz / 60 Hz
3,5 kV DC
500 V (rms.), 50 Hz / 60 Hz
5 kV (peak); 1.2/50 µs; 0.5 J
3 positive and 3 negative surges at intervals of 5 s
EMC tests for noise immunity
Standards
IEC 60255-6, 60255-22 (Product standards)
EN 50082-2 (Basic specification)
(Type tests) DIN 57 435 part 303
High frequency test 2.5 kV (peak); 1 MHz; τ = 15 ms; 400 surges per s;
IEC 60255-22-1, class III and DIN 57 435
test duration 2 s
part 303, class III
Discharge of static electricity
8 kV contact discharge; 15 kV air discharge; both
IEC 60255-22-2 class IV
EN 61000-4-2, class IV
polarities; 150 pF; R j = 330 Ω
Exposure to RF field, non modulated
10 V/m; 27 MHz to 500 MHz
IEC 60255-22-3 (report) class III
Exposure to RF field, amplitude-modulated
10 V/m; 80 MHz to 1000 MHz; 80% AM; 1 kHz
IEC 61000-4-3, class III
Exposure to RF field, pulse-modulated
10 V/m; 900 Mhz; repetition frequency 200 Hz;
IEC 61000-4-3/ ENV 50204, class III duty cycle 50 %
Fast transients, Bursts
4 kV; 5/50 ns; 5 kHz; burst length = 15 ms;
IEC 60255-22-4 and
repetition frequency 300 ms; both polarities;
IEC 61000-4-4, class IV
Rj =50Ω; test duration 1 min
High-energy surge voltages (SURGE),
IEC 61000-4-5 installation class III
Auxiliary supply common (longitudinal) mode: 2kV; 12Ω, 9µF
differential(transversal) mode: 1kV; 2Ω, 18µF
Measurements inputs, binary inputs, binary outputs common (longitude) mode: 2kV; 42Ω,0.5µF
differential(transversal) mode: 1kV; 42Ω, 0.5µF
Conducted RF, amplitude-modulated
10 V; 150 kHz to 80 Mhz; 80 % AM; 1kHz
IEC 61000-4-6, class III
Magnetic field with power frequency
30 A/m continuous;
IEC 61000-4-8, class IV
300 A/m for 3 s; 50 Hz
IEC 60255-6
0.5 mT; 50 Hz
Oscillatory Surge Withstand Capability
2,5 to 3 kV (peak); 1 to 1,5 Mhz
ANSI/IEEE C37.90.1
damped wave; 50 surges per second;
Duration 2 s; Ri = 150Ω to 200Ω
Fast Transient Surge Withstand Capability
4 kV to 5 kV; 10/150 ns; 50 impulses per second;
ANSI/IEEE C37.90.1 both polarities; Duration 2s;Rj =80Ω
Radiated Electromagnetic Interference
35 V/m; 25 MHz to 1000 Mhz
IEEE C37.90.2
Damped oscillations
2.5 kV (peak value), polarity alternating 100 kHz,
IEC 60894, IEC 61000-4-12
1 Mhz, 10 Mhz and 50 Mhz, Rj = 200Ω
EMC tests for interference emission
(Type test)
Standard
EN 50081-1 (Basic specification)
Radio interference voltage on lines,
only auxiliary supply
IEC-CISPR 22
Interference field strenght
IEC-CISPR 22
150kHz to 30 Mhz
class B
30 Mhz to 1000 MHZ
class B
Siemens SIP 4.2 · 08/99 23

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Technical Device Data
Mechanical dynamic tests
Vibration, shock stress and vibration
during earthquake
Standards IEC 60255-21 and IEC 60068-2
Vibration
IEC 60255-21-1, class 2
IEC 60068-2-6
Shock
IEC 60255-21-2, class 1
IEC 60068-2-27
Vibration during earthquake
IEC 60255-21-2, class 1
IEC 60068-3-3
Vibration and shock stress
during transport
Standards IEC 60255-21 and IEC 60068-2
Vibration
IEC 60255-21-1, class 2
IEC 60255-2-6
Shock
IEC 60255-21-2, class 1
IEC 60068-2-27
Repetitive shock
IEC 60255-21-2, class 1
IEC 60068-2-29
sinusoidal
10 Hz to 60 Hz: ±0.075 mm amplitude;
60 Hz to 150 Hz: 1 g acceleration
frequency sweep 1 octave/min
20 cycles in 3 othogonal axes
half-sinusoidal
acceleration 5 g, duration 11 ms, 3 shocks each in
both directions of the 3 axes
sinusoidal
1 Hz to 8 Hz:±3,5 mm amplitude (horizontal axis)
1 Hz to 8 Hz:±1.5 mm amplitude (vertical axis)
8 Hz to 35 Hz: 1g acceleration (horizontal axis)
8 Hz to 35 Hz: 0.5 g acceleration (vertical axis)
frequency sweep 1 octave/min
1 cycle in 3 orthogonal axes
sinusoidal
5 Hz to 8 Hz:±7.5 mm amplitude;
8 Hz to 150 Hz: 2 g acceleration
frequency sweep 1 octave/min
20 cycles in 3 orthogonal axes
half-sinusoidal
acceleration 15 g, duration 11 ms, 3 shocks each
in both directions of the 3 axes
half-sinusoidal
acceleration 10 g, duration 16 ms, 1000 shocks
each in both directions of the 3 axes
Climatic stress tests
Temperatures
Humidity
Temperature during service
-5°C to +55°C
Temporary permissible temperature limit during service -20°C to +70 °C
(The legibility of the display may be affected
above 55°C)
Temperature limit during storage
-25°C to +55°C
Temperature limit during transport
-25°C to +70°C
(Storage and transport with standard factory packaging)
Permissible humidity stress
yearly average ≤ 75% relative humidity; on 56 days
in the year up to 93% relative humidity; moisture
condensation during operation is not permitted
CE conformity
This product is in conformity with the directive of the Conformity is proved by tests that had been
Council of the European Communities on the
performed according to Article 10 of the
approximation of the laws of the member states Council Directive in accordance with the
relating to electromagnetic compatibility generic standards EN 50081 and EN 50082
(EMC Council Directive 89/336/EEC) and concerning (for EMC directive) and the standards EN 60255-6
electrical equipment for application within specified (for low-voltage directive) by Siemens AG.
voltage limits (low-voltage directive 73/23 EEC).
The device is designed in accordance with the
international standards of IEC 60255.
Further applicable standards:
ANSI/IEEE C37.90.0 and C37.90.1
24 Siemens SIP 4.2 · 08/99

Technical Function Data
Distance protection – ANSI 21, 21N
Fault locator
Distance zones
6, 1 as extended (overreach) zone
all zones may be set forward or/and reverse
or ineffective
Time stages
6 for multi-phase faults
3 for single-phase faults
Characteristic
(refer to ordering code)
selectable seperately for phase and
quadrilateral and/or
ground (earth) faults
MHO
Time range
0.00 to 30 s (step 0.01s) or deactivated
Line angle ϕ L
30° to 89° (step 1°)
Quadrilateral reactance reach X
0.05Ω to 250Ω (1A) / 0.01Ω to 50Ω (5A)
(step 0.01Ω)
Quadrilateral resistance reach R
for phase-to-phase faults and
0.05Ω to 250Ω (1A) / 0.01Ω to 50Ω (5A)
phase-to-ground (earth) faults
(step 0.01Ω)
MHO impedance reach ZR
0.05Ω to 200Ω (1A) / 0.01Ω to 40Ω (5A)
(step 0.01Ω)
Minimum phase current I
0.10A to 4A (1A) / 0.50A to 20A (5A)
(step 0.01A)
Ground- (Earth-) fault pickup
Neutral (residual) current 3 I 0
Zero sequence voltage 3V 0
Zero sequence compensation
selectable input formats
Seperately selectable for zones
0.05A to 4A (1A) / 0.25A to 20A (5A)
(step 0.01A)
1 to 100V (step 1V) or deactivated
RG/RL and XG/XL
k 0 and ϕ (k 0 )
Z1
higher zones
RG/RL and XG/XL - 0.33 to 7 (step 0.01)
k 0
0 to 4 (step 0.001)
ϕ (k 0 ) -135° to 135°
Parallel line mutual compensation
(refer to ordering code)
RM/RL and XM/XL 0.00 to 8 (step 0.01)
Load encroachment
Minimum load resistance
0.10Ω to 250Ω (1A) / 0.02Ω to 50Ω (5A)
(step 0.01Ω) or deactivated
Maximum load angle 20° to 60° (step 1°)
Directional decision for all types of faults
Directional sensitivity
Tolerances
Timer tolerance
Operating times
Minimum trip time
Reset time
with sound phase polarization and/or voltage
memory
dynamically unlimited
for sinusodial quantities
∆X
X ≤ 5% for 30° ≤ϕ scc ≤ 90°
∆R
R ≤ 5% for 0° ≤ϕ scc ≤ 60°
∆Z
Z
≤ 5% for -30° ≤(ϕ scc −ϕ line ) ≤+30°
± 1% of set value or 10ms
approx. 17ms at 50Hz
approx. 15ms at 60Hz
approx. 30ms
Output of the distance to fault
X, R (secondary) in Ω
X, R (primary) in Ω
distance in kilometers or miles
distance in % of line length
Start of calculation
with trip, with pickup reset
Reactance per unit length 0.005 to 6.5Ω /km (1A) / 0.001 to 1.3Ω /km (5A) or
0.005 to 10Ω / mile (1A) / 0.001 to 2Ω / mile (5A)
(step 0.001Ω / unit)
Tolerance
for sinusodial quantities
≤ 2.5% line length for 30° ≤ϕ scc ≤ 90° and
V scc /V N > 0.10
Siemens SIP 4.2 · 08/99 25

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Technical Function Data
Power swing detection – ANSI 68, 68T
Power swing detection principle
Max. detectable power swing frequency
Operating modes
Power swing blocking programs
Detection of faults during power swing blocking
measurement of the rate of impedance vector
change and scanning of the vector course
approx. 7 Hz
power swing blocking and/or
power swing tripping (out of step tripping)
all zones blocked
Z1/Z1B blocked
Z2 to Z5 blocked
Z1, Z1B, Z2 blocked
stop power swing blocking for all types of faults
Pilot- (Tele-) protection for distance protection – ANSI 85-21
Direct transfer trip
Operating modes
Transient blocking logic
(current reversal guard)
Send and receive signals
Trip time delay
Timer tolerance
POTT
PUTT, DUTT
directional comparison Blocking
directional comparison Unblocking
directional comparison hybrid (POTT and echo
with Weak Infeed protection)
for overreaching schemes
suitable for 2- and 3- terminal lines
phase segregated signals for selective single phase
tripping selectable
0.00 to 30s (step 0.01s) or deactivated
± 1% of set value or 10ms
Ground- (Earth-) fault overcurrent protection – ANSI 50N, 51N, 67N
Characteristic
Inrush restraint
Instantaneous trip after switch-onto-fault
Influence of harmonics
Stages 1 and 2
Stages 3 and 4
3 definite time stages / 1 inverse time stage or
4 definite time stages
Selectable for every stage
Selectable for every stage
3 rd and higher harmonics are completely
suppressed by digital filtering
2 nd and higher harmonics are completely
suppressed by digital filtering
Definite time ground (earth) Pickup definite time stage 1, 3I 0 0.5A to 25A (1A) / 2.5A to 125A (5A)
overcurrent protection
(step 0.01A)
ANSI 50N Pickup definite time stage 2, 3I 0 0.2A to 25A (1A) / 1A to 125A (5A)
(step 0.01A)
Pickup definite time stage 3, 3I 0
0.05A to 25A (1A) / 0.25A to 125A (5A)
(step 0.01A)
with normal neutral (residual) current CT
(refer to ordering code)
0.003A to 25A (1A) / 0.015A to 125A (5A)
(step 0.01A)
with high sensitive neutral (residual) current CT
(refer to ordering code)
Pickup definite time stage 4, 3I 0
Time delay for definite time stages
Tolerances
Current starting
Delay times
Pickup times
Definite time stages 1 and 2
Definite time stages 3 and 4
0.05A to 4A (1A) / 0.25A to 20A (5A)
(step 0.01A)
with normal neutral (residual) current CT
(refer to ordering code)
0.003A to 4A (1A) / 0.015A to 20A (5A)
(step 0.01A)
with high sensitive neutral (residual) current CT
(refer to ordering code)
0.00 to 30s (step 0.01s) or deactivated
≤ 3% of set value or 1% of I nom
± 1% of set value or 10ms
approx. 30ms
approx. 40ms
26 Siemens SIP 4.2 · 08/99

Technical Function Data
Inverse time ground (earth) Current starting 3I 0 0.05A to 4A (1A) / 0.25A to 20A (5A)
overcurrent protection
(step 0.01A)
ANSI 51N
with normal neutral (residual) current CT
(refer to ordering code)
0.003A to 4A (1A) / 0.015A to 20A (5A)
(step 0.01A)
with high sensitive neutral (residual) current CT
(refer to ordering code)
Tripping time characteristics Characteristics normal inverse
according to IEC 60255-3
very inverse
extremely inverse
long time inverse
Time multiplier
T p = 0.05 to 3s (step 0.01s) or deactivated
Pickup threshold
approx. 1.1 x I/I p
Reset threshold
approx. 1.05 x I/I p
Tolerances
Operating time for 2 ≤ I/I p ≤ 20
≤ 5% of setpoint ± 15ms
Tripping time characteristics Characteristics inverse
according to ANSI/IEEE
short inverse
long inverse
moderately inverse
very inverse
extremely inverse
definite inverse
Time dial
0.50 to 15 (step 0.01) or deactivated
Pickup threshold
approx. 1.1 x M
Reset threshold
approx. 1.05 x M
Tolerances
Operating time for 2 ≤Μ≤20
≤ 5% of setpoint ± 15ms
Tripping time according to
Logarithmic inverse characteristic
Characteristic t[s] = T 3I0p max -T 3I0p ⋅ln 3 I
3
Pickup threshold 1.1 to 4.0 x I/Ip (step 0.1)
0
I
0 p
Directional decision Polarizing quantities for directional decision 3I 0 and 3V 0 or
ANSI 67N
3I 0 and 3V 0 and I g (grounded power transformer) or
3I 2 and 3V 2 (negative sequece)
Zero sequence voltage 3V 0
0.5 to 10V (step 0.1V)
Ground current I g of grounded power transformer 0.05A to 1A (1A) / 0.25A to 5A (5A) (step 0.01A)
Negative sequence voltage 3V 2
0.5 to 10V (step 0.1V)
Negative sequence current 3I 2
0.05A to 1A (1A) / 0.25A to 5A (5A) (step 0.01A)
Inrush restraint 2 nd harmonic ratio 10 to 45% of fundamental (step 1%)
Maximum current, overriding inrush restraint
0.5A to 25A (1A) / 2.5A to 125A (5A) (step 0.01A)
Siemens SIP 4.2 · 08/99 27

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Technical Function Data
Pilot-(Tele-) protection for directional ground-(earth-) fault overcurrent protection – ANSI 85-67N
Operating modes
Transient blocking logic
Send and receive signals
directional comparison Pickup
directional comparison Blocking
directional comparison Unblocking
for schemes with parallel lines
suitable for 2- and 3- terminal lines
Weak Infeed protection with undervoltage – ANSI 27WI
Operating modes with carrier (signal) reception echo
echo and trip with undervoltage
Undervoltage phase-ground (-earth) 2V to 70V (step 1V)
Time delay
0.00s to 30s (step 0.01s)
Echo impulse
0.00s to 30s (step 0.01s)
Tolerances
Voltage threshold ≤ 5% of set value or 0.5V
Timer
± 1% of set value or 10ms
Backup overcurrent protection – ANSI 50(N), 51(N)
Operating modes
Characteristic
Instantaneous trip after switch-onto-fault
active only with loss of VT secondary circuit
always active
2 definite time stages / 1 inverse time stage
selectable for every stage
Definite time overcurrent Pickup definite time stage 1, phase current 0.1A to 25A (1A) / 0.5A to 125A (5A)
protection
(step 0.01A)
ANSI 50, 50N Pickup definite time stage 1, neutral (residual) 0.05A to 25A (1A)
/ 0.25A to 125A (5A)
current
(step 0.01A)
Pickup definite time stage 2, phase current
0.1A to 25A (1A) / 0.5A to 125A (5A)
(step 0.01A)
Pickup definite time stage 2, neutral (residual)
0.05A to 25A (1A) / 0.25A to 125A (5A)
current
(step 0.01A)
Time delay for definite time stages
0.00 to 30s (step 0.01s) or deactivated
Tolerances
Current starting
≤ 3% of set value or 1% of I nom
Delay times
± 1% of set value or 10ms
Operating time
approx. 25ms
Inverse time overcurrent Phase current starting 0.1A to 4A (1A) / 0.5A to 20A (5A)
protection
(step 0.01A)
ANSI 51, 51N Neutral (residual) current starting 0.05A to 4A (1A) / 0.5A to 20A (5A)
(step 0.01A)
Tripping time characteristics Characteristics normal inverse
according to IEC 60255-3
very inverse
extremely inverse
long time inverse
Time multiplier
T p = 0.05 to 3s (step 0.01s) or deactivated
Pickup threshold
approx. 1.1 x I/I p
Reset threshold
approx. 1.05 x I/I p
Tolerances
Operating time for 2 ≤ I/I p ≤20
≤ 5% of setpoint ±15ms
28 Siemens SIP 4.2 · 08/99

Technical Function Data
Tripping time characteristics Characteristics inverse
according to ANSI/IEEE
short inverse
long inverse
moderately inverse
very inverse
extremely inverse
definite inverse
Time dial
0.50 to 15 (step 0.01) or deactivated
Pickup threshold
approx. 1.1 x M
Reset threshold
approx. 1.05 x M
Tolerances
Operating time for 2 ≤ M ≤ 20
≤ 5% of setpoint ±15ms
STUB bus overcurrent protection – ANSI 50(N)-STUB
Operating modes
Characteristic
Instantaneous trip after switch-onto-fault
Pickup phase current
Pickup neutral (residual) current
active only with open isolator position
(signalled via binary input)
1 definite time stage
selectable
0.1A to 25A (1A) / 0.5A to 125A (5A)
(step 0.01A)
0.05A to 25A (1A) / 0.25 to 125A (5A)
(step 0.01A)
Time delay, separate for phase and
0.00 to 30s (step 0.01s) or deactivated
ground (earth) stage
Reset ratio approx. 0.95
Tolerances
Current starting
≤ 3% of set value or 1% of I nom
Delay times
± 1% of set value or 10ms
Instantaneous high speed switch-onto-fault overcurrent protection – ANSI 50HS
Operating mode
active only after CB closing; instantaneous
trip after pickup
Pickup current
1A to 25A (1A) / 5A to 125A (5A)
(step 0.01A)
Reset ratio approx. 0.95
Tolerances
Current starting
≤ 3% of set value or 1% of I nom
Operating time
approx. 13ms
Overvoltage protection – ANSI 59
Measured quantities
3 phase-ground (-earth) voltages and
zero sequence voltage 3V 0
(zero sequence voltage can be measured via
separate VT or can be calculated internally)
Operating modes
local trip and/or
carrier trip impulse for remote end trip
Pickup phase-ground (-earth) voltage
1V to 170V (step 0.1V)
Pickup zero sequence voltage 3V 0
1V to 300V (step 0.1V)
Trip time delay, separate for phase-ground
0.00 to 30s (step 0.01s) or deactivated
(-earth) and zero sequence voltage
Carrier send impulse
0.05s to 0.5s (step 0.01s)
Reset ratio 0.95
Tolerances
Pickup
≤ 3% of set value or 1V
Timers
± 1% of set value or 10ms
Operating time
phase-ground (earth) voltage
approx. 30ms
zero sequence voltage
approx. 65ms
Siemens SIP 4.2 · 08/99 29

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Technical Function Data
Breaker failure protection – ANSI 50BF
Number of stages 2
Current start
0.1A to 4A (1A) / 0.5A to 20A (5A) (step 0.01A)
Delay time
0.05 to 1s (step 0.01s)
Shortest release time
approx. 10ms
Timer tolerance
± 1% of setting value or 10ms
Automatic reclosure – ANSI 79
Synchronism check – ANSI 25
Number of automatic reclosures up to 8
Program
only 1-pole
only 3-pole
1 or 3-pole
Voltage check
discrimination between successful and
non-successful reclose attempts
Action times
0.01 to 30 s (step 0.01s)
Dead times
0.01 to 1800 s (step 0.01s)
Reclaim times
0.5 to 30 s (step 0.01s)
CLOSE command duration
0.01 to 30 s (step 0.01s)
Timer tolerance
± 1% of setting value or 10ms
Operating modes
Line dead / busbar dead V 1 /V 2 <
Synchronism V 1 >/V 2 >
Permissible voltage difference 1 to 50 V (step 1V)
Permissible frequence difference
0.01 to 1 Hz (step 0.01 Hz)
Permissible angle difference 1 to 60° (step 1)
Supervision time
0.01 to 30 s (step 0.01s)
30 Siemens SIP 4.2 · 08/99

Technical Function Data
Operational measured values
Currents
primary, secondary and percent
3xI phase
3I 0 , I 1 , I 2 , I G ,3I 0par
Tolerances
10 to 50% V nom typically ≤1% of 50% V nom
50 to 200%V nom typically ≤1% of measured value
Voltages
primary, secondary and percent
3xV phase-ground, 3xV phase-phase
3V 0 ,V 1 ,V 2 ,V SYNC ,V en
Tolerances
10 to 50% I nom typically ≤1% of 50% I nom
50 to 200% I nom
typically ≤1% of measured value
Power and direction of power flow
primary and percent
P, real power in W
Q, reactive power in Var
S, apparent power in VA
Frequency
f
Power factor
PF
Load impedances with direction
primary and secondary
3x(R phase-ground ,X phase-ground )
3x(R phase-phase ,X phase-phase )
Tolerances
P: typically ≤ 3%
for |cos ϕ| = 0.7 to 1 and
V/V nom , I/I nom = 50 to 120%
Q: typically ≤ 3%
for |sin ϕ| = 0.7 to 1 and
V/V nom , I/I nom = 50 to 120%
S: typically ≤ 2%
for V/V nom ,I/I nom = 50 to 120%
f: ≤ 20mHz
PF: ≤ 3%
for |cos ϕ| = 0.7 to 1
Oscillographic fault recording
Measured analog channels
3 x I phase
,3I 0
,3I 0par
3xV phase ,3V 0 ,V SYNC ,V en
Binary channels
pickup and trip information, other signals can be
freely configured
Maximum number of available recordings 8
Sampling interval
20 samples per cycle
Storage time
total of 5s
pre-event and post-event recording time and
event storage time settable
Additional functions
Measurement supervision
current summation
current balance
voltage summation
voltage phase sequence
fuse failure monitor
Annunciations
Event logging buffer length 200
Fault logging
storage of signals of the last 8 faults,
buffer length 200
Switching statistics
phase segregated summation of circuit
breaker operations
summated tripping current per phase
tripping current of the last trip
Circuit breaker test
trip-/close-cycle 3phase
trip-/close-cycle per phase
Setting range
Dead time for CB trip-close-cycle
0.00 to 30s (step 0.01s)
Commissioning aids
operational measured values
circuit breaker test
read binary inputs
initiate binary inputs
set binary outputs
set serial interface outputs
Siemens SIP 4.2 · 08/99 31

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Selection and ordering data
Current transformer
Phase = 1A, Ground (Earth) = 1A (min. = 0.05A) 1
Phase = 1A, Ground (Earth) = high sensitive 1A (min. = 0.005A) 1) 2
Phase = 5A, Ground (Earth) = 5A (min. = 0.25A) 5
Phase = 5A, Ground (Earth) = high sensitive 5A (min. = 0.005A) 1) 6
1) Position 7=2orposition 7=6isnotavailable with Position 14 = K, M, N, Q
Position 7 8 9 10 11 12 13 14 15 16
7
S
A
5
2
2
7
–
–
Auxiliary Voltage (Power supply, Binary indication voltage)
24V to 48V DC, binary input threshold 17V 2
60V to 125V, binary input threshold 17V 4
110V to 250V DC, 115 V AC, binary input threshold 73V 5
220V to 250V DC, 115V AC, binary input threshold 154V 6
8
Housing and quantity of binary inputs (BI) and outputs (BO)
1/2 x 19’‘, 8 BI, 16 BO, Flush-mounting housing with screw terminals A
1/1 x 19’‘, 16 BI, 24 BO, Flush-mounting housing with screw terminals C
1/1 x 19’‘, 24 BI, 32 BO, Flush-mounting housing with screw terminals D
1/2 x 19’‘, 8 BI, 16 BO, Surface-mounting housing with screw terminals 2) E
1/1 x 19’‘, 16 BI, 24 BO, Surface-mounting housing with screw terminals 2) G
1/1 x 19’‘, 24 BI, 32 BO, Surface-mounting housing with screw terminals 2) H
1/2 x 19’‘, 8 BI, 16 BO, Flush-mounting housing with plug-in terminals J
1/1 x 19’‘, 16 BI, 24 BO, Flush-mounting housing with plug-in terminals L
1/1 x 19’‘, 24 BI, 32 BO, Flush-mounting housing with plug-in terminals M
2) Position 11 =5orposition 11 =6isnotavailable with position 9 = E, G, H
9
Region and operating language
Region GE, language german
Region World, language UK-english
Region US, language US-english
Other languages on request
10
A
B
C
System interface for substation control (on rear of device)
No system interface 0
IEC 60870-5-103, electrical RS232 1
IEC 60870-5-103, electrical RS485 2
IEC 60870-5-103, fiber optical 820 nm, ST-connector 3
PROFIBUS FMS Slave, electrical RS485 (*) 4
PROFIBUS FMS, optical fiber, single ring, ST-connector 2) (*) 5
PROFIBUS FMS, optical fiber, double ring, ST-connector 2) (*) 6
Other protocols on request
2) Position 11 =5orposition 11 =6isnotavailable with position 9 = E, G, H
11
Service interface (2 nd operating interface) for DIGSI / Modem (on rear of device)
No 2 nd operating interface 0
Electrical RS232 1
Electrical RS485 2
Optical fiber 820nm, ST-connector 3
With remote relay interface (in preparation)
12
*) available with next firmware release
32 Siemens SIP 4.2 · 08/99

Selection and ordering data
Position 13 14 15 16
Trip mode
Trip mode 3pole 0
Trip mode 1- and 3pole 4
13
Distance characteristic (ANSI 21, 21N), Power Swing (ANSI 68)
Parallel Line Compensation
14
Quadrilateral without Power Swing without Parallel Line Comp. C
Quadrilateral and/or MHO without Power Swing without Parallel Line Comp. E
Quadrilateral with Power Swing without Parallel Line Comp.. F
Quadrilateral and/or MHO with Power Swing without Parallel Line Comp. H
Quadrilateral without Power Swing with Parallel Line Comp. 1) K
Quadrilateral and/or MHO without Power Swing with Parallel Line Comp. 1) M
Quadrilateral with Power Swing with Parallel Line Comp. 1) N
Quadrilateral and/or MHO with Power Swing with Parallel Line Comp. 1) Q
1) Position 7=2orPosition 7=6isnotavailable with Position 14 = K, M, N, Q
Autoreclosure (AR, ANSI 79), Synchrocheck (Sync., ANSI 25)
15
Breaker Failure protection (BF, ANSI 50BF), Overvoltage protection (OV, ANSI 59)
Without AR without Sync. without BF without OV A
Without AR without Sync. without BF with OV B
Without AR without Sync. with BF without OV (*) C
Without AR without Sync. with BF with OV (*) D
Without AR with Sync. without BF without OV (*) E
Without AR with Sync. without BF with OV (*) F
Without AR with Sync. with BF without OV (*) G
Without AR with Sync. with BF with OV (*) H
With AR without Sync. without BF without OV (*) J
With AR without Sync. without BF with OV (*) K
With AR without Sync. with BF without OV (*) L
With AR without Sync. with BF with OV (*) M
With AR with Sync. without BF without OV (*) N
With AR with Sync. without BF with OV (*) P
With AR with Sync. with BF without OV (*) Q
With AR with Sync. with BF with OV (*) R
Ground (Earth) Fault Overcurrent protection (ANSI 50N, 51N, 67N)
Without 0
With 4
16
*) available with next firmware release
Siemens SIP 4.2 · 08/99 33

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Accesories
Description Order No. Size of
package
Supplier
Fig
Fig. 32
Mounting rail
for 19”rack
Fig. 33
2-pin connector
Fig. 34
3-pin connector
Connector 2-pin
Connector 3-pin
C73334-A1-C35-1
C73334-A1-C36-1
Crimp connector 827039-1
CI2 0.5-1 mm 2
Crimp connector 827396-1
CI2 0.5-1 mm 2
Crimp connector 827040-1
CI2 1-2.5 mm 2
Crimp connector 827397-1
CI2 1-2.5 mm 2
Crimp connector 163083-7
Type III+ 0.75-1.5 mm 2
Crimp connector 163084-2
Type III+ 0.75-1.5 mm 2
Crimping tool for Typ III+
Crimping tool for CI2
0-169422-1
0-825582-0
1
1
4000
taped on reel
1
4000
taped on reel
1
Siemens
Siemens
AMP 1)
AMP 1)
AMP 1)
AMP 1)
4000 AMP 1)
taped on reel
1
AMP 1)
1
1
AMP 1)
AMP 1)
19”mounting rail C73165-A63-D200-1 Siemens 32
33
34
Short-circuiting links
- for current terminals
- all other terminals
Terminal cover
- large
- small
(included)
C73334-A1-C33-1
C73334-A1-C34-1
C73334-A1-C31-1
C73334-A1-C32-1
1
1
1
1
Siemens
Siemens
Siemens
Siemens
35
36
5
5
Fig. 35
Short circuit link for current
contacts
Fig. 36
Short circuit link for voltage/
signal contacts
1) AMP Deutschland GmbH
Amperesstr. 7-11
D-63225 Langen
Phone:: +49 6103 709-0
Fax +49 6103 709-223
Please check with your local
representative for local supplier
Product Description Versions Order Number
DIGSI 4
Software for operation and usage
of protection devices of Siemens
MS Windows program, running under MS Windows
NT 4, MS Windows 95
Including device templates, online manual
Professional
7XS5402 – 0AA00
Complete version: Basis version and DIGRA 4, DIGSI REMOTE 4,
SIMATIC CFC 4, Display Editor 4 and Graphic Tools 4 with license
for 10 purchase. 1 copper connection cable included
Basis
Complete version with license for 10 PCs, 1 copper connection
cable included
7XS5400 – 0AA00
Copper connection cable
Demo version
Functionality of Basis version without the availability of
communication with relays
between PC and relay
(9-pin female to 9-pin male)
7XS5401 – 0AA00
7XV5100-4
Two-channel binary signal transducer
The bidirectional transducer registers binary
information at two binary inputs and forwards
it via fibre-optic cable to a second transducer,
which outputs the signals via contacts.
Distances of about 3 km can be realized directly
via multimode fibre-optic cables. The repeater
7XV5451 is available for distances up to 14 km
via monomode fibre-optic cable. Because of serial
transmission connection can also be made by
standby modem or a digital network via the
asynchronous RS232 interface.
Plastic housing, for snap mount on 35 mm DIN EN 50022 rail
Auxiliary voltage supply DC 24 to 250V and AC110 to 220V with
alarm relay
2 binary inputs, 2 trips,
1 alarm relay with potential free contacts
Connector to a second transducer via fibre optic cable with
820nm,
FSMA-plug to connect to the fibre-optic cable 62,5 µm/125 µm
Connection to a second transducer via a communication system
with a RS232 interface, 9-pole. SUB-D socket
7XV5653-0AA00
Instruction Manual 7SA522 V4.00, English C53000-G1176-C119
Instruction Manual 7SA522 V4.00, US English C53000-G1140-C119
7SA522 Advertising sheet English E50001-U321-A133-X-7600
SIPROTEC Overview sheet English E50001-U321-A118-X-7600
34 Siemens SIP 4.2 · 08/99

Trip time curves
The figures 37 and 38 show
the tripping time curves for
the distance protection function.
These curves apply to
lines with a Source Impedance
Ratio (SIR) up to 20.
The tripping time includes
the output contact closing
time.
The curves are based on a
line with conventional VT’s,
no pre-fault load and faults
without fault resistance.
Trip time (ms)
35
30
25
20
15
f=50Hz,SIR

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Connection diagrams according to IEC Standard
Figure 37
Housing 1/2 x 19’‘, Basic Version 7SA522*-*A, 7SA522*-*E and 7SA522*-*J
with 8 Binary Inputs and 16 Binary Outputs
Flush mounting
Surface mounting
25
50
24
49
23
48
22
47
20
45
19
44
21
46
43
18
42
17
41
40
14
39
38
13
37
12
36
11
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
R15
R16
R17
R18
R13
R14
K17
K18
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
I L1
I L2
I L3
I 4
V L1
V L2
V L3
V 4
BI 1
BI 2
BI 3
BI 4
BI 5
BI 6
BI 7
BI 8
Fast BO1
Fast BO2
Fast BO3
Fast BO4
Fast BO5
Fast BO6
Fast BO7
BO8
BO9
BO10
BO11
Live status contact
NC or NO with Jumper
=
BO12
BO 13
BO 14
BO 15
=
(~)
Serial
Interfaces
+
-
K5
K6
K7
K8
K9
K10
K11
K12
K13
K14
K15
K16
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
K3
K4
K1
K2
88
63
87
62
86
61
85
60
84
59
83
58
74
99
73
98
97
72
96
71
95
70
94
69
90
65
L+(15)
L-(16)
Service interface
DIGSI, Modem
C
System/Scada
interface
B
Front interface
Time
synchronization
A
Figure 38
Serial interfaces
36 Siemens SIP 4.2 · 08/99

Connection diagrams according to IEC Standard
Figure 39
Housing 1/1 x 19’‘, Medium Version 7SA522*-*C, 7SA522*-*G and 7SA522*-*L
with 16 Binary Inputs and 24 Binary Outputs
Surface mounting
Flush mounting
50
100
49
99
48
98
47
97
45
95
44
94
46
96
75
25
74
24
73
23
72
22
71
21
70
20
69
19
90
40
89
39
86
36
85
35
84
34
83
33
82
32
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
R15
R16
R17
R18
R13
R14
K17
K18
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
P17
P18
N1
N2
N3
N4
N5
N6
N7
N8
N9
N10
N11
N12
I L1
I L2
I L3
I 4
V L1
V L2
V L3
V 4
BI 1
BI 2
BI 3
BI 4
BI 5
BI 6
BI 7
BI 8
BI 9
BI 10
BI 11
BI 12
BI 13
BI 14
BI 15
BI 16
Fast BO1
Fast BO2
Fast BO3
Fast BO4
Fast BO5
Fast BO6
Fast BO7
BO8
BO9
BO10
BO11
Live status contact
NC or NO with Jumper
=
BO12
BO 13
BO 14
BO 15
BO16
NC or NO
with Jumper
BO 17
BO 18
BO 19
BO 20
BO 21
BO 22
BO 23
=
(~)
Serial
Interfaces
+
-
K5
K6
K7
K8
K9
K10
K11
K12
K13
K14
K15
K16
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P13
P14
P15
P16
K3
K4
K1
K2
173
123
172
122
171
121
170
120
169
119
168
118
149
199
148
198
197
147
196
146
195
145
194
144
190
140
189
139
188
138
187
137
186
136
185
135
184
134
174
124
L+ (37)
L- (38)
Note: for serial interfaces see Figure 38
Siemens SIP 4.2 · 08/99 37

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Connection diagrams according to IEC Standard
Figure 40
Housing 1/1 x 19’‘, Maximum Version 7SA522*-*D, 7SA522*-*H and 7SA522*-*M with
24 Binary Inputs and 32 Binary Outputs
Surface mounting
Flush mounting
50
100
49
99
48
98
47
97
45
95
44
94
46
96
75
25
74
24
73
23
72
22
71
21
70
20
69
19
90
40
89
39
86
36
85
35
84
34
83
33
82
32
68
18
67
17
66
16
65
15
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
R15
R16
R17
R18
R13
R14
K17
K18
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
P17
P18
N1
N2
N3
N4
N5
N6
N7
N8
N9
N10
N11
N12
H17
H18
G1
G2
G3
G4
G5
G6
I L1
I L2
I L3
I 4
V L1
V L2
V L3
V 4
BI 1
BI 2
BI 3
BI 4
BI 5
BI 6
BI 7
BI 8
BI 9
BI 10
BI 11
BI 12
BI 13
BI 14
BI 15
BI 16
BI 17
BI 18
BI 19
BI 20
BI 21
Fast BO1
Fast BO2
Fast BO3
Fast BO4
Fast BO5
Fast BO6
Fast BO7
BO8
BO9
BO10
BO11
BO12
Live status contact
NC or NO with Jumper
=
BO 13
BO 14
BO 15
BO16
NC or NO
with Jumper
BO 17
BO 18
BO 19
BO 20
BO 21
BO 22
BO 23
BO24
NC or NO
with Jumper
BO 25
BO 26
BO 27
BO 28
BO 29
BO 30
BO 31
=
(~)
+
-
K5
K6
K7
K8
K9
K10
K11
K12
K13
K14
K15
K16
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P13
P14
P15
P16
H3
H4
H5
H6
H7
H8
H9
H10
H11
H12
H13
H14
H15
H16
K3
K4
K1
K2
173
123
172
122
171
121
170
120
169
119
168
118
149
199
148
198
197
147
196
146
195
145
194
144
190
140
189
139
188
138
187
137
186
136
185
135
184
134
166
116
165
115
164
114
163
113
162
112
161
111
160
110
174
124
L+ (37)
L- (38)
64
14
63
13
62
12
G7
G8
G9
G10
G11
G12
BI 22
BI 23
BI 24
Serial
Interfaces
Note: for serial interfaces see Figure 38
38 Siemens SIP 4.2 · 08/99

Connection diagrams according to ANSI Standard
Figure 41
Housing ½ x 19’‘, Basic Version 7SA522*-*A, 7SA522*-*E and 7SA522*-*J with
8 Binary Inputs and 16 Binary Outputs
Surface mounting
25
50
24
49
23
48
22
47
20
45
19
44
21
46
43
18
42
17
41
40
14
39
38
13
37
12
36
11
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
R15
R16
R17
R18
R13
R14
K17
K18
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
I A
I B
I C
I 4
V A
V B
V C
V 4
BI 1
BI 2
BI 3
BI 4
BI 5
BI 6
BI 7
BI 8
Fast BO1
Fast BO2
Fast BO3
Fast BO4
Fast BO5
Fast BO6
Fast BO7
=
BO8
BO9
BO10
BO11
BO12
BO 13
BO 14
BO 15
Live status contact
NC or NO with Jumper
=
(~)
Serial
Interfaces
Flush mounting
+
-
K3
K4
K1
K2
K5
K6
K7
K8
K9
K10
K11
K12
K13
K14
K15
K16
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
88
63
87
62
86
61
85
60
84
59
83
58
74
99
73
98
97
72
96
71
95
70
94
69
90
65
L+(15)
L-(16)
Service interface
DIGSI, Modem
C
System/Scada
interface
B
Front interface
Time
synchronization
A
Figure 42
Serial interfaces
Siemens SIP 4.2 · 08/99 39

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Connection diagrams according to ANSI Standard
Figure 43
Housing 1/1 x 19’‘, Medium Version 7SA522*-*C, 7SA522*-*G and 7SA522*-*L
with 16 Binary Inputs and 24 Binary Outputs
Surface mounting
Flush mounting
50
100
49
99
48
98
47
97
45
95
44
94
46
96
75
25
74
24
73
23
72
22
71
21
70
20
69
19
90
40
89
39
86
36
85
35
84
34
83
33
82
32
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
R15
R16
R17
R18
R13
R14
K17
K18
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
P17
P18
N1
N2
N3
N4
N5
N6
N7
N8
N9
N10
N11
N12
I A
I B
I C
I 4
V A
V B
V C
V 4
BI 1
BI 2
BI 3
BI 4
BI 5
BI 6
BI 7
BI 8
BI 9
BI 10
BI 11
BI 12
BI 13
BI 14
BI 15
BI 16
Fast BO1
Fast BO2
Fast BO3
Fast BO4
Fast BO5
Fast BO6
Fast BO7
BO8
BO9
BO10
BO11
=
BO12
BO 13
BO 14
BO 15
BO16
NC or NO
with Jumper
BO 17
BO 18
BO 19
BO 20
BO 21
BO 22
BO 23
Live status contact
NC or NO with Jumper
=
(~)
Serial
Interfaces
K5
K6
K7
K8
K9
K10
K11
K12
K13
K14
K15
K16
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P13
P14
P15
P16
K3
K4
+
K1
- K2
173
123
172
122
171
121
170
120
169
119
168
118
149
199
148
198
197
147
196
146
195
145
194
144
190
140
189
139
188
138
187
137
186
136
185
135
184
134
174
124
L+ (37)
L-(38)
Note: for serial interfaces see Figure 42
40 Siemens SIP 4.2 · 08/99

Connection diagrams according to ANSI Standard
Figure 44
Housing 1/1 x 19’‘, Maximum Version 7SA522*-*D, 7SA522*-*H and 7SA522*-*M
with 24 Binary Inputs and 32 Binary Outputs
Surface mounting
Flush mounting
50
100
49
99
48
98
47
97
45
95
44
94
46
96
75
25
74
24
73
23
72
22
71
21
70
20
69
19
90
40
89
39
86
36
85
35
84
34
83
33
82
32
68
18
67
17
66
16
65
15
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
R15
R16
R17
R18
R13
R14
K17
K18
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
P17
P18
N1
N2
N3
N4
N5
N6
N7
N8
N9
N10
N11
N12
H17
H18
G1
G2
G3
G4
G5
G6
I A
I B
I C
I 4
V A
V B
V C
V 4
BI 1
BI 2
BI 3
BI 4
BI 5
BI 6
BI 7
BI 8
BI 9
BI 10
BI 11
BI 12
BI 13
BI 14
BI 15
BI 16
BI 17
BI 18
BI 19
BI 20
BI 21
Fast BO1
Fast BO2
Fast BO3
Fast BO4
Fast BO5
Fast BO6
Fast BO7
BO8
BO9
BO10
BO11
Live status contact
NC or NO with Jumper
=
BO12
BO 13
BO 14
BO 15
BO16
NC or NO
with Jumper
BO 17
BO 18
BO 19
BO 20
BO 21
BO 22
BO 23
BO24
NC or NO
with Jumper
BO 25
BO 26
BO 27
BO 28
BO 29
BO 30
BO 31
=
(~)
+
-
K5
K6
K7
K8
K9
K10
K11
K12
K13
K14
K15
K16
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P13
P14
P15
P16
H3
H4
H5
H6
H7
H8
H9
H10
H11
H12
H13
H14
H15
H16
K3
K4
K1
K2
173
123
172
122
171
121
170
120
169
119
168
118
149
199
148
198
197
147
196
146
195
145
194
144
190
140
189
139
188
138
187
137
186
136
185
135
184
134
166
116
165
115
164
114
163
113
162
112
161
111
160
110
174
124
L+ (37)
L- (38)
64
14
63
13
62
12
G7
G8
G9
G10
G11
G12
BI 22
BI 23
BI 24
Serial
Interfaces
Note: for serial interfaces see Figure 42
Siemens SIP 4.2 · 08/99 41

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Dimension drawings
Figure 45
Flush mounting 1/2 x 19’‘ with screw and
plug-in terminals
225 (8.86)
220 (8.66)
221 +2 (8.70 + 0.079 )
255.8 ±0.3 (10.07 ± 0.012 )
245 +1(9.64 +0.039)
5(0.20)orM4
6(0.24)
4.3
(0.17)
13.2
(0.52)
7.3
(0.29)
180 ± 0.5 (7.09 ± 0.020 )
206.5 ± 0.3 (8.13 ± 0.012 )
Housing 1/2 x 19’‘
Rear view
Housing 1/2 x 19’‘
Panel cutout
29.5
(1.16)
172 (6.77) 34
(1.34)
29.5
(1.16)
172 (6.77)
29
(1.14)
30
(1.18)
266 (10.47)
244 (9.61)
266 (10.47)
244 (9.61)
2
(0.08)
2
(0.08)
34
(1.34)
Side view with
screw terminals
Side view with
plug-in terminals
Note:
Dimensions are indicated in millimeters;
values stated in brackets are inches
42 Siemens SIP 4.2 · 08/99

Dimension drawings
Figure 46
Flush mounting 1/1 x 19’‘ with screw and
plug-in terminals
450 (17.72)
445 (17.52)
446 +2 (17.56 + 0.079 )
255.8 ± 0.3 (10.07 ± 0.012)
245 + 1(9.64 + 0.039)
5 (0.20)
or M4
6 (0.24)
6 (0.24)
5 (0.20)
or M4
5 (0.20)
or M4
6 (0.24)
6 (0.24)
5 (0.20)
or M4
4.3
(0.17)
7.3
(0.29)
216.1 ± 0.3 (8.51 ± 0.012 )
425.5 ± 0.3 (16.75 ± 0.012 )
13.2
(0.52) 13.2
(0.52)
13.2
(0.52)
Housing 1/1 x 19’‘
Rear view
Housing 1/1 x 19’‘
Panel cutout
29.5
(1.16)
172 (6.77) 34
(1.34)
29.5
(1.16)
172 (6.77)
29
(1.14)
30
(1.18)
266 (10.47)
244 (9.61)
266 (10.47)
244 (9.61)
2
(0.08)
2
(0.08)
34
(1.34)
Side view with
screw terminals
Side view with
plug-in terminals
Note:
Dimensions are indicated in millimeters;
values stated in brackets are inches
Siemens SIP 4.2 · 08/99 43

SIPROTEC 4 – 7SA522
Distance Protection Relay for Transmission Lines
Dimension drawings
Figure 47
Surface mounting 1/1 and 1/2 x 19’‘
260 (10.24)
29.5
(1.16)
25
(0.98)
266 (10.47)
71
(2.80)
72
(2.83)
52
(2.05)
Side view
240 (9.45)
219 (8.62) 10.5
(0.41)
51 75
101
465 (18.31)
444 (17.48)
150
10.5
(0.41)
76 100
151
200
225 (8.86)
280 (11.02)
320 (12.60)
344 (13.54)
450 (17.72)
280 (11.02)
320 (12.60)
344 (13.54)
1 25
1 50
9 (0.35)
26 50
9 (0.35)
51 100
Front view
Housing 1/2 x 19’‘
Front view
Housing 1/1 x 19’‘
Note:
Dimensions are indicated in millimeters;
values stated in brackets are inches
44 Siemens SIP 4.2 · 08/99

Appendix
Explanation of ANSI numbers, IEC designation
ANSI IEC ANSI Standard 7SA522
number
14 Underspeed device. A device that functions when the speed of a machine
–
falls below a determined value.
21
Distance relay. A relay that functions when the circuit admittance, impedance,
or reactance increases or decreases beyond a predetermined value.
Phase distance measurement
21N
Ground distance measurement
FL
Fault locator
25 Synchronizing or synchronism-check device. A device that operates when
two ac circuits are within the desired limits of frequency, phase angle and voltage
to permit or cause the paralleling of these two circuits.
Synchro-check function
27
27WI
U< Undervoltage relay. A relay that operates when its input voltage is less than a
predetermined value.
32 Directional power relay. A relay that operates on a predetermined value of power
flow in a given direction or upon reverse power flow such as that resulting from the
motoring of a generator upon loss of its prime mover.
33 Position switch. A switch that makes or breakes contact when the main device
or piece of apparatus that has no device function number reaches a given position.
34 Master sequence device. A device such as a motor opoerated multicontact switch,
or the equivalent, or a programming device, such as a computer, that establishes
or determines the operating sequence of the major devices in equipment during
starting and stopping or during other sequencial switching operations.
37 I< Undercurrent or underpower relay. A relay that functions when the current or
power flow decreases below a predetermined value.
46 I2 Reverse-phase or phase-balance current relay. A relay that functions when the
polyphase currents are of reverse-phase sequence or when the polyphase currents
are unbalanced, or contain negative phase-sequence components above a given
amount.
47 Phase-sequence or phase-balance voltage relay. A relay that functions upon a
predetermined value of polyphase voltage in the desired phase sequence, when
the polyphase voltages are unbalanced, or when the negative phase-sequence voltage.
48 Incomplete sequence relay. A relay that generally returns the equipment to the
normal, or off, position and locks it out if the normal starting, operating, or stopping
sequence is not properly completed within a predetermined time.
49 Machine or transformer thermal relay. A relay that functions when the temperature
of a machine armature winding or other load-carrying winding or element of a machine
or power transformer exceeds a predetermined value.
50 I>>, I> Instantaneous overcurrent relay. A relay that functions instantaneously on an
excessive value of current
50N 3I 0 >>>,
3I 0 >>, 3I 0>
50N-2 3I 0 >
50BF
50HS
50 STUB
50N STUB
51
51N
51N-2
I ph
I>>>
I ph STUB
3I 0 STUB
I p ,3I 0p
3I0p
3I 0p
AC time overcurrent relay. A relay that functions when the ac input current exceeds
a predetermined value, and in which the input current and operating time are inversely
related d through a substantial portion of the performance range.
52 AC circuit breaker. A device that is used to close and interrupt an ac power circuit under
normal conditions or the interrupt this circuit under fault or emergency conditions.
55 cos ϕ Power factor relay. A relay that operates when the power factor in an ac circuit
rises above or falls below a predetermined value.
Phase-Ground undervoltage in
combination with Weak Infeed
trip function
–
Application of programmable logic
Application of programmable logic
Application of programmable
logic. Operating measured value
and limit value module
1. Measured value supervision:
current symmetry / balance
2. Application of programmable
logic: Operating measured value
and limit value module
1. Measured value supervision:
voltage symmetry / balance
2. Application of programmable
logic: Operating measured value
and limit value module
Application of programmable logic
–
Phase-overcurrent time protection
as backup
Ground overcurrent time protection
(directional)
Ground-overcurrent time protection
as backup stage
Breaker failure protection
Instantaneous high speed
s-o-t-f protection
STUB-bus overcurrent stage,
phase and ground
Phase-overcurrent inverse time
protection as backup
Ground overcurrent inverse time
protection (directional)
Ground-overcurrent inverse time
protection as backup stage
–
Application of programmable
logic. Operating measured value
and limit value module
Siemens SIP 4.2 · 08/99 45

Appendix
Explanation of ANSI numbers, IEC designation
ANSI IEC ANSI standard 7SA522
number
59 U>>, U> Overvoltage relay. A relay that operates when its input voltage is more than a
predetermined value.
Phase-ground and zero sequence
overvoltage
62 Time-delay stopping or opening relay. A time-delay relay that serves in conjunction
with the dvice that initiates the shutdown, stopping or opening operation in an
automatic sequence or protective relay system.
64 U T > Ground detector relay. A relay that operates upon failure of machine or other
apparatus insulation to ground.
66 Notching or jogging device. A device that functions to allow that only a specified
number of operations of a given device or equipment, or a specified number of
successive operations within a given time of each other. It is also a device that
functions to energize a circuit periodically or for fractions of specified time intervals,
or that is used to permit intermittent acceleration or jogging of a machine at low
speeds for mechanical positioning.
67 AC directional overcurrent relay. A relay that functions on a desired value of ac
overcurrent flowing in a predetermined direction
Application of programmable
logic
Ground fault detection
67 N Directional ground-fault time
overcurrent
68
Blocking relay is a relay that initiates a pilot signal for blocking or tripping on external
faults in a transmission line or in other apparatus under predetermined conditions, or
cooperates with other devices to block tripping or to block reclosing on an out-of-step
condition or on power swings
Power swing blocking
68 T
Power swing tripping
74
74 TC
Alarm relay. A relay other than an annunciator, as covered under device function 30,
that is used to operate, or that operates in connection with, a visual or audible alarm.
Trip circuit supervision
79 AC reclosing relay. A relay that controls the automatic reclosing and locking out of an
ac circuit interrupter.
Auto reclosing function
81 Frequency relay. A relay that responds to frequency of an electrical quantity, operating
when the frequency or rate of change of frequency exceeds or is less than a
predetermined value.
85
85-21
Teleprotection
Carrier or pilot-wire receiver relay is a relay that is operated or restrained by a signal
used in connection with carrier-current or dc pilot-wire fault directional relaying.
–
Application of programmable
logic: Operating measured value
and limit value module
Pilot schemes for distance
protection
85-67N
86 Lockout relay. A hand or electrically reset auxiliary relay that is operated upon the
occurence of abnormal conditions to maintain associated equipment or devices
inoperative until it is reset
87 Differential protective relay. A protective relay that functions on a percentage, phase
angle, or other quantitive difference between two currents or some other electrical
quantities.
Pilot schemes for directional
ground fault protection
Trip signal lock-out
see product range 7SD or 7UT
46 Siemens SIP 4.2 · 08/99

List of abbreviations used
A, B, C Phase designation according to ANSI
AMZ curves
Inverse time overcurrent protection
IDMT characteristics
ANSI
American National Standard Institute
AR
Auto-reclosure
ARC
Auto-reclosure
BI
Binary Input
BO
Binary Output
CFC
Continuous Function Chart
DCF77
Time synchronizing signal in Germany
DO
Digital Output
EF
Earth Fault detection
Flash-EPROM
Electrically Programmable and Erasable Memory
FO
Fiber Optic Conductor
GPS
Global Position System
IBS
Commissioning
IEC
International Electrotechnical Commission
IRIG B
Time synchronizing signal via GPS
L1, L2, L3 Phase designation according to IEC
LED
Light Emitting Diode
MHO
Circle characteristic in the impedance plane
NC
Normally Closed output relay contact, e.g. contacts are closed if relay is not activated
NO
Normally Open output relay contact, e.g. contacts are open if relay is not activated
OLM
Optical Link Module
PLC
Programmable Logic Control
PLC
Power Line Carrier
R
Relay
SC
Substation Controller
SCADA
Supervisory Control and Data Aquisition
SICAM
Substation Information Control Automation and Monitoring System
SIMATIC
SIEMENS Automation Technology
SIPROTEC
SIEMENS PROTECTION
SIR
Source to line impedance ratio
Ratio of the source impedance behind a relay terminal to the line impedance.
UMZ curves
Definite time overcurrent protection
DT characteristics
Siemens SIP 4.2 · 08/99 47

Siemens Companies and Representatives
Siemens AG Power Transmission and Distribution
Europe
Austria
Siemens AG Österreich
Siemensstr. 88 - 92
A-1211 Wien
Mrs. Strobach
Phone:+43-1-1707-22522
Fax:+43-1-1707-53075
Belgium
Siemens S. A.
Chaussée de Charlerois
116
B-1060 Brüssel
Mr. Belvaux
Phone:+32-2-53621-2595
Fax:+32-2-53621-6900
Czech. Republic
Siemens s. r. O.
Na Strzi 40
CZ-140 00 Prag 4
Mr. Slechta
Phone:+420-2-61095209
Fax:+420-2-61095252
Denmark
Siemens A / sincerely
Borupvang 3
DK-2750 Ballerup
Mr. Jensen
Phone:+45-4477 4309
Fax:+45-4477 4020
Finland
Siemens Osakeyhtiö
Majurinkatu 1
FIN-02601 Espoo
Mr. Tuukkanen
Phone:+358-9-5105 3846
Fax:+358-9-5105 3530
France
Siemens S. A.
39-47, boulevard Ornano
F 93527 Saint Denis
Mr. Cieslak
Phone:+33-1-4922 3469
Fax:+33-1-4922 3090
Great Britain
Siemens plc
William Siemens House
Princess Road
Manchester M20 2UR
Mr. Denning
Phone:+44-1-614465130
Fax:+44-1-614465105
Greece
Siemens A. E.
Artemidos 8
GR-151 10 Athen
Mr. Roubis
Phone:+30-1-6864530
Fax:+30-1-6864703
Italy
Siemens S.p. A.
Via Fabio Filzi 29
I-20 124 Mailand
Mr. Mormile
Phone:+39-02-66762854
Fax:+39-02-66762347
Ireland
Siemens Ltd.
8 Raglan Road
Ballsbridge
Dublin 4
Mr. Kernan
Phone:+353-1-603 2430
Fax:+353-1-603 2499
Netherlands
Siemens Nederland N.V.
Prinses Beatrixlaan 26
NL-2500 BB Den Haag
Mr. Langedijk
Phone:+31-70-333 3126
Fax:+31-70-333 3225
Norway
Siemens A / sincerely
Ostre Aker vei 90
N-0518 Oslo
Mr. Gravermoen
Phone:+47-22-633140
Fax:+47-22-633796
Poland
Siemens Sp.z.o.o.
ul. Zupnicza 11
PL-03-821 Warschau
Mr. Dombrowski
Phone:+48-22-8709120
Fax:+48-22-6709139
Portugal
Siemens S. A.
Apartado 60300
P-2700 Amadora
Mr. Pissarro
Phone:+351-1-417 8253
Fax:+351-1-417 8071
Slovenia
Branch office: Siemens
Austria
Spain
Siemens S.A.
Apartado 155
E 28 020 Madrid
Mr. Martin
Phone:+34-1-5147562
Fax:+34-1-5147037
Switzerland
Siemens-Albis AG
Freilagerstr. 28 - 40
CH-8047 Zürich
Mr. Horisberger
Phone:+41-1-495-3566
Fax:+41-1-495-3253
Turkey
SIMKO Ticaret ve Sanayi
AS
Meclisi Mebusan
Caddesi125
80040 Findikli-Istanbul
Mr. Uzuner
Phone:+90-0216-4593741
Fax:+90-0216-4592155
Africa
Egypt
Siemens Ltd.
Cairo, P.O.Box 775 /
11511
26, El Batal Ahmed
Abdel Aziz Str.
Mohandessin
Mr. Aly Abou-Zied
Phone:+20-2-3499727,
Fax:+20-2-3446774
South Africa
Siemens Ltd., PT & D
26 Electron Ave.,
Isando 1600
Mr. A Matthe
Phone:+27-11-921 2499
Fax:+27-11-921 7100
Australia
Siemens Ltd., PT & D
Sydney Office
383 Pacific Highway
Artarmon N.S.W. 2064
Mr. Fomin
Phone:+61-2-9950 8649
Fax:+61-2-9950 8733
North America
USA
Siemens
Power Transmission &
Distribution, LLC
7000 Siemens Rd.
Wendell , NC 27591
Mr. C. Pretorius
Phone:+1-919-365 2196
Fax: +1-919-365 2552
Mexico
Siemens S.A. DE C.V.
Pte. 116 No. 590,
Col. Ind. Vallejo
02300 Mexico D.F.
Mr. Loredo
Phone:+52-5-3282012
Fax:+52-5-3282241
South America
Brazil
Siemens S.A.
Coronel Bento Bicudo,
111 Lapa
05069-900 Sao Paulo -SP
Mr. Muramoto
Phone: +55-11-833 4079
Fax:+55-11-833 4391
Columbia
Siemens S.A., GDH
Santafe de Bogota,D.C.
Cra 65 No. 11-83
Conmuta
Mr. Walter Bing-Zaremba
Phone:+57-1-294 2222
Fax:+57-1-294 2500
Asia
China
Siemens Ltd., PT & D
No. 7, Wangjin
Zhonghuan Nanlu,
Chaoyang District
Beijing, 100015
Mr. Sure En Lee
Phone:+86-10-6436 1888
ext. 3806
Fax:+86-10-64381464
Hong Kong
Siemens Ltd., PTD 58/F
Central Plaza
18 Harbour Road
Wanchai, Hong Kong
Mr. Humphrey S.K. Ling
Phone:+852-2583 3388
Fax:+852-28029908
India
Siemens Ltd., PTD / ZLS
4A, Ring Road, I.P. Estate
New Delhi 110 002
Mr. A. K. Dixit
Phone:+91-11-3719877
Fax:+91-11-3739161
Indonesia
P.T. Siemens Indonesia
Jl. Jend. A. Yani
Pulo Mas, Jakarta 13210
P.O.Box 2469
Jakarta 10001
Mr. Volker Schenk
Phone:+62-21-4729 153
Fax: +62-21-471 5055,
472 9201
Korea
Siemens Ltd
10th Floor Asia Tower
Bldg
726, Yeoksam-dong,
Kangman-gu
Seoul 100-630, Korea
Mr. Kim Se-ho
Phone: +82-2-5277 805
Malaysia
Siemens
Electrical Engineering
Sdn Bhd
13 th Floor, CP Tower
11 Section 16/11, Jalan
Damansara
46350 Petaling Jaya
Selangor Darul Ehsan
Mr. Vind Sidhu
Phone:+60-3-751 3929
(direct)
Phone:+60-3-7513888
(switchb.)
Fax:+60-3-757 0380
Phillipines
Siemens Inc.
14 F Centerpoint building
Orligas Center, Pasig City
Makati 1229, Metro Manila
Mr. De Guzmann
Phone.:+63-2-637 0900
Fax:+63-2-633 5592
Singapore
Power Automation
89 Science Park, #04-13
The Rutherford,
Singapore 112861
Mr. Au
Phone:+65-872 2688
Fax:+65-872 3692
Taiwan
Siemens Ltd., PT & D
Dept.
19th Floor, 333, Tun-Hua
S. Road,
Sec. 2, (P.O.Box 26-755)
Taipei
Mr. Frances Peng
Phone:+886-2-23788900
ext.832
Fax:+886-2-2378 8958
Thailand
Siemens Limited, EV SP
Dept.
Charn Issara Tower II,
32ndFloor
2922/283 New Petchburi
Road
Bangkapi, Huaykwang
Bangkok 10320
Mr. Chaturawit sincerely.
Phone:+66-2-715-4815
Fax:+66-2-715-4785
Vietnam
Siemens AG, Representation
5B Ton Duc Thang Str.
District 1
Ho Chi Minh City
Ms. Hung
Phone:+84-8825 1900
Fax:+84-8825 1580
48 Siemens SIP 4.2 · 08/99

Conditions of Sale and Delivery · Export Regulations
Trademarks
Conditions of Sale and Delivery
Subject to the
General Conditions of Supply
and Delivery
for Products and Services of
the Electrical and Electronic
Industry and to any other conditions
agreed upon with the
recipients of catalogs.
Technical data, dimensions
and weights are subject to
change unless otherwise stated
on the individual pages of
this catalog.
The illustrations are for reference
only.
We reserve the right to adjust
the prices and shall charge
the price applying on the
date of delivery.
A En 1.91a
Export Regulations
Trademarks
Siemens Online
In accordance with the
present provisions of the
German Export List and the
US Commercial Control List,
export licences are not
required for the products
listed in this catalog.
An export licence may
however be required due to
country-specific application
and final destination of the
products.
Relevant are the export
criteria stated in the delivery
note and the invoice
subject to a possible export
and reexport licence.
Subject to change without
notice.
All product designations used
are trademarks or product
names of Siemens AG or of
other suppliers.
The Power Transmission and
Distribution Group can also
be found in the Internet:
http://www.ev.siemens.de
Siemens SIP 4.2 · 08/99 49

Responsible for
Technical contents: Michael Claus,
Product Manager Distance Protection
Siemens AG, EV S V13, Nuremberg, Germany
Ordering No: E50417-K1176-C114–A
Printed in Germany

Power Transmission and
Distribution Group
Protection and Substation
Control Systems Division
P.O. Box 48 06
D-90026 Nuremberg
http://www.ev.siemens.de
Siemens Aktiengesellschaft Subject to change without notice Ordering No: E50417-K1176-C114–A
Printed in Germany