[lo_paus-210113-01.vsd, 1, en_US]
Figure 6-259
Logic Diagram for the Plausibility Release of the Circuit-Breaker Restrike Protection
The plausibility-release logic checks the following conditions:
•
When the parameter Plausibility via 50BF fct. is set to yes, the pickup signal of the Circuit-
breaker failure protection is monitored. The plausibility release is given if the Circuit-breaker failure
protection has picked up.
•
When the parameter Plaus. via open/trip cmd is set to yes, the trip/open command is moni-
tored. The plausibility release is given if the trip/open command has been generated.
•
When the parameter Plaus. via binary input is set to yes, the
>release
signal is monitored.
The plausibility release is given if the
>release
signal has been received.
If one of the conditions is fulfilled, the plausibility release is given for 5 s. The 5-s timer ensures that the
release criterion and start condition relate to the same circuit-breaker opening/tripping process.
If all the 3 plausibility settings are set to no, the start/stop-monitoring logic considers the release as fulfilled.
For safety reasons, the input signal
>release
has a preset software filtering time of 20 ms.
Start/Stop Monitoring
Via the start/stop monitoring logic, the monitoring duration of the current signal regarding restriking is deter-
mined.
Protection and Automation Functions
6.42 Circuit-Breaker Restrike Protection
854 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
To Next Page
Loading...
