D.C. Switchgear Range Type SECUB-2 - Secheron

SUBSTATIONS
D.C. Switchgear Range
Type SECUB-2

A domain of expertise
With a complete range of equipment and a leading expertise
in DC traction power substations, Sécheron SA is a world
leader and major partner for electrification of DC traction
networks. Covering all activities from calculation, network
design and engineering, up to the production of the DC
Systems, Sécheron SA can offer customers and partners
tailor made solutions based on a modular concept and
standard products.
Our equipment is developed on world leading technology
and proven worldwide design and acceptance. In-house
technology covers all key devices applied in the DC Systems
(rectifiers, DC HSCB, Disconnecting Switches, Protection
relays, measuring amplifiers, etc.).
SECUB-2: DC switchgear for light rail applications
The SECUB-2 cubicle is a compact DC switchgear solution
designed for DC traction substations powering light transportation
systems such as tramways, LRT, trolleybuses, monorails
and LIM.
SECUB-2 completes the range of Sécheron DC switchgear
that covers heavy duty transportation systems.
SECUB-2 is the improved evolution of the SECUB which has
widely been installed in various networks since more than 10
years.
Main features
• Rated current up to 2400 A (main circuit)
• Rated voltage up to 900 Vdc
• Metal enclosed switchgear compartment equipped with high-speed
circuit-breaker
• Bi-directional current interruption
• Rated short-circuit current up to 100 kA (150 kA peak)
• Equipped with a high-performance Protection and Control Relay type
SEPCOS
• Strong, compact and durable cubicle
• Modular construction
• Limited and easy maintenance
• Designed according to EN 50123 & IEC 61992 standards
New features:
• Possibility to integrate a disconnecting switch in the rear compartment
• Access from the front of the cubicle after having fully removed the drawer

Description
The metal enclosed compartmented DC switchgear type SECUB-2 integrates three separated compartments for high and low
voltage equipment:
• Low voltage compartment including protection and control devices
• High-speed circuit-breaker compartment
• Rear high voltage busbar compartment including optional disconnecting switch
Protection and control compartment
Accessible from the front of the cubicle, the low voltage compartment includes the protection and control relay SEPCOS, the
low voltage equipment (MCBs, relays etc.).
High speed circuit breaker compartment
The HV compartment includes the high-speed circuit-breaker which is mounted on a withdrawable drawer.
The drawer can easily be drawn in or out of the cubicle and connected or disconnected from buses by means of power finger
connectors.
The HSCB’s auxiliary circuits can be connected or disconnected thanks to a multiple connector.
The unlocking mechanism of the door ensures a trip of the HSCB before opening.
Behind this door, a polycarbonate protecting screen ensures the security of personel and prevent contact with live parts.
With the door open, the drawer can be drawn in or out with a handle located on the drawer frame (linked to a locking system).
When the drawer has been drawn out, it can be easily placed on a trolley (optional) allowing easy maintenance operations and
access inside the cubicle.
The withdrawable circuit breaker drawer has four different positions:
• Service
• Test
• Disconnected
• Removed
It is possible to see the physical
state of the HSCB (opened or
closed) as well as the drawer
position (service or test) trough a
window located on the front door.
A counter showing the number
of HSCB operation is also visible
through this window.
The drawer also contains a measuring shunt. The isolated amplifiers for current (MIU10) and voltage (VM10) measurement as well
as the line test components are mounted on a retractable plate located below the drawer.
With the plate removed, the power cable connection compartment is easily accessible inside the cubicle. This feature makes the
installation against the wall possible.
This compartment is separated from the busbar compartment thanks to isolating shutters.
Rear high voltage busbar compartment
The busbar rear compartment is composed of two main parts:
• Main incoming busbar
• Connection for outgoing cables, copper bars are provided to connect the power cable to the third rail or the catenary
• As an option, an off load disconnecting switch can be mounted to insure the by-pass or line isolating function

Main technical data
Symbol
Unit
Cubicle type
SECUB-2 UR15 SECUB-2 UR26
Rated service current I Ne [A] 1500 A 2600 A
Rated voltage UNe [VDC] 900 900
Rated insultation voltage Unm [VDC] 1800 1800
Nominal voltage Un [VDC] 600/750 600/750
Power frequency withstand voltage Ua [kV] 6.9 kV, 50 Hz, 1min.
Rated service current
Main busbar [kA] 2400A 2400A / 4000A*
Rated short-circuit current INss / ÎNss [kA] 12 / 18 100 / 150
Protection degree (doors and walls)
IP30
Protection degree (roof)
IP20 / IP32** / IP42**
Ambient temperature range [VDC] -5 °C ... +40 °C
Typical weights (Without disconnector) [kg] 330 350
Dimensions (WxDxH) [mm] 450x1400x2200
* 4000A: option
** IP32/IP42: option
Designed according to standard specifications EN 501 23 and IEC 61992
Composition
Unique feature:
Key components of the switchgear are designed and manufactured by Sécheron and are fully compatible.
SEPCOS
Protection relay
SWS18.20
Disconnecting Switch
SEPCOS
Touch-screen display
VM10
Isolated amplifier for
Voltage Measurement
UR26.81S
High-speed circuit breaker
MIU10
Isolated amplifier for
Current Measurement

Main dimensions
1. Circuit-breaker
450
1400
2. Withdrawable breaker drawer
3. Low-voltage compartment
(protection and control circuits)
4. Main plugs (power circuit)
100
3
1075
325
5. Shunt (current)
6. Current measuring amplifier
7. Voltage measuring amplifier
8
10
8. Busbar compartment
9. Output cable
2200
11
10. Bypass busbar (option)
11. Disconnecting switch (option)
12. Main busbar
1
12
4
1430
2
5
6
7
9
SECUB-2 HSCB cubicle: Main applications
Main configurations:
MAIN BUSBAR
MAIN BUSBAR
MAIN BUSBAR
1. Line feeder
E SEPCOS E SEPCOS E SEPCOS
2. Line feeder with isolating switch
Line Test
I >
Line Test
I > I >
I I I
Line Test
3. Line feeder with earthing switch
MIU10
MIU10
MIU10
4. Rectifier breaker
U
VM10
M
U
VM10
U
VM10
5. Line feeder with bypass
1
2 3
MAIN BUSBAR
MAIN BUSBAR
BY-PASS BUSBAR
E
SEPCOS
E
SEPCOS
I >
I >
I
MIU10
Line Test
I
MIU10
M
U
VM10
4
5

SEPCOS control and protection relay
SEPCOS is a protection and control unit that is applied to the outgoing feeder or the
incoming HSCB cubicles in the DC traction substation.
Main features:
• Modular PLC concept, PLC programming, IEC61131 normalized programming.
• Fully approved in railway substation environment EN50255-22.
• High noise immunity thanks to sampling rate at 40 microseconds and
16 bits A-D converter.
Protection functions:
• All typical protection functions (e.g. Function DDL +/-, Imax +/-, etc.).
Control functions:
• HSCB ON / OFF control with electric or magnetic holding.
• Intertripping, automatic reclosing, anti-pumping, line test function.
• External synchronization of the PLC, measurement supervisor control.
Open to all customer network and protocols:
• TCP/IP: MODBUS-TCP
• Specific TCP/IP based power distribution protocols:
- IEC60870-5-104
- DNP3
- IEC61850
• Fieldbus: MODBUS-RTU, Profibus DP
SEPCOS in the low-voltage compartment
The SEPCOS may be controlled and parametrized
through a user friendly 7″ color Touch Screen display
which is located on the front door of the cubicle.
All functions are available through a web server
(S-Web), including visualization of trends.
Products and Services
Sécheron provides complete DC substations systems including:
• Transformer-rectifier group
• DC switchgear including:
- DC HSCB cubicles
- Disconnector cubicles
- Contactor cubicles
• Voltage limiting devices
• Protection and control systems
• Human Machine Interfaces
Sécheron also provides services in order to support customers in network design and installation of our systems:
• DC System Engineering
• Dynamic simulation of complete networks
• Short-circuit, earthing circuit and harmonic calculation
• Supervision of installation and commissioning
• In line and field testing

Full compact lightrail solution
With years of experience in the field of traction rectifiers, today proposes a cubicle which integrates both functions of rectifier and
isolating switch.
This cubicle is normally used combined with the SECUB-2.
It is a compact solution for LRT’s substation building and reserves ample space for convenient maintenance operation.
Example of Rectifier+AIS cubicle delivered for a tramway substation
Power Diode Blocks
Diodes fitted in heatsinks combined
with snubbers and optional fuses
Reverse current
detection
RC Filter
Combined with base-load
resistor
SWS / SWG
Bipolar off-load motorized
disconnecting swich with
optional earthing connection
Touch Voltage Protection
Optional Negative-earth
voltage threshold relay
MIU10 / VM10
Isolated amplifiers for current and
voltage measurement
Frame leakage detection
Frame-earth current
threshold relay
IPT
Optional Interphase coil
for connection with coupled
rectifier transformers
Side view of rectifier+AIS cubicle (right side)
Technical data
Symbol
Unit
Rated service current I Ne [A] up to 1600 A
Rated Power P [W] upt to 1200 kW
Rated voltage U Ne [VDC] 900
Rated insultation voltage U nm [VDC] 1800
Nominal voltage U n [VDC] 600/750
Power frequency withstand voltage U a [kV] 6.9 kV, 50 Hz, 1min.
Output signal
6 or 12 pulses
Connection scheme
1 or 2 Graetz bridges in parallel
Protection degree (basic)
IP20
Ambient temperature range [VDC] -5 °C ... +40 °C
Typical weight [kg] 950
Dimensions (WxDxH) [mm] 1600x1400x2200
Cooling
Natural Air

Standards
The SECUB-2 has been successfully type tested at IPH laboratory in Berlin.
According to standards:
• IEC 61992-2:2006
• EN 50123-2:2003
Approved type test reports available.
Main features related to SECUB-2 breaker cubicle
Rated voltage (Une)
Rated insulation voltage
Rated service current (Ine)
Rated making & breaking capacity (Înss/Inss)
Rated track time constant (Tnc)
Duty classes
900VDC
1800VDC
2600A
100/150kA
31.5ms
f, e, d
SG820794BEN_B00-05.13
Sécheron SA
Rue du Pré-Bouvier 25
1217 Meyrin - Geneva
CH-Switzerland
Tel: +41 (0)22 739 41 11
Fax: +41 (0)22 739 48 11
substations@secheron.com
www.secheron.com
This document is not contractual and contains information corresponding to the level of technology at the date of printing. Sécheron reserves the right to modify and/or improve the product,
whose characteristics are described in these documents, as required by new technology at any time. It is the purchaser’s responsibility to inform himself, no matter what the circumstances,
of the product’s maintenance conditions and requirements. Séche ron reserves all rights, especially those arising from our “General Delivery Conditions”.
Copyright© 2007 Sécheron SA