WL Circuit Breakers - Siemens

Functions/Parameters for Communications
WL Circuit Breaker
Setpoints
In addition to the load management option
(load shedding/load restore), the metering
module offers an option for automatic
monitoring of operating data and the
generation of an alarm.
Two setpoints can be defined (e.g., for
overvoltage). With the lower setpoint, an
alarm can be generated via the setpoint
value (e.g. > 480V), whereas, with a
voltage increase, a tripping event (e.g. >
528V) can be generated.
Minimum for Communicated Currents
In order to avoid the detection, display
and communication of very low currents
generated by system noise, even with the
circuit breaker in the disconnect position,
the “Minimum for Communicated Currents”
parameter offers the option of setting all
detected current values smaller than this
parameter to zero. The factory setting is
50A. This means that all values smaller
than 50A are displayed as “0” on the
display, interpreted as “0” for internal
calculations (power) and also transmitted
as “0” via the communications. If this
parameter is changed to “0”, this function
is deactivated and all detected current
measuring values will be directly used.
2/19
The parameter can be found in the parameter
tree of the BDA.
Normal Positive Power Flow Direction
The current direction of the energy “flow”
and the question, “How much energy has,
up to now, flowed in both directions?” is of
particular interest for tie breaker applications.
For a determination, it is important to
define a “normal direction.” This direction
can either be “from top to bottom” or “from
bottom to top.”The measured real power is
either assigned a positive polarity (in
normal direction) or a negative polarity
(opposite of normal direction). In contrast,
the measured currents are always assigned
a positive polarity.
With energy, the transmitted energy values
are incorporated in two counters, real
energy and real energy opposite to normal
direction. The two energy counters are not
assigned a polarity.
Figure
2-7
Event and Trip Log
All events (except for tripping events) are
labeled with a time stamp and an ON (+)
or OFF (-) indication and entered in the
event log.
The event log has a depth of 10 events
and works like a FiFo memory (first in,
first out), i.e. the oldest event is deleted
from the event log upon the occurrence
of a new event.
The trip log is similar to the event log,
however, only the last 5 trips are recorded
with a time stamp and entered in the
trip log.
Note: The event and the trip log are only
available with the COM15/COM16 module.
In the event log the last 10 events on the CubicleBUS are listed. The trip log contains the last 5 trips.
Both of them can be displayed with the BDA.
WL PROFIBUS/MODBUS Communication and Electronic Accessories