ABB Relion 611 Series, Technical Manual

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The function contains a blocking functionality. It is possible to block function outputs
and the reset timers, if desired.
5.5.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of CBPSOF can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
GUID-A786834F-1BA2-4DD6-8457-D38BCBC4ABF8 V2 EN
Figure 157: Functional module diagram
Trigger
This module is used for detecting possible fault immediately after closing the circuit
breaker. An external protection function for example, PHxPTOC or EFxPTOC is used
for fault indication. The
START
and
START_DLYD
inputs are available for feeding
the detected fault.
•
START
input is used when it is required to enable SOTF control immediately
after protection function indicates a fault.
•
START_DLYD
input is used when time delayed SOTF control enabling is
needed. In this case, the delay can be set with a Operate delay time setting.
SOTF control
The SOTF control is activated when
CB_CL_CMD
circuit breaker closing command
input is activated. The module is kept active until the set SOTF reset time is exceeded
after the CB_CL_CMD is deactivated. The
OPERATE
output is activated when a fault
indication signal is received from the Trigger module while the SOTF control is still
active.
5.5.5 Application
The
CB_CL_CMD
input activates CBPSOF. In the standard configuration, the breaker
close command should be connected to this input. The SOTF reset time setting
parameter is used for keeping CBPSOF active for a certain time after the CB close
command is executed.
Section 5
1MRS757454 D
Protection related functions
326 611 series
Technical Manual