Circuit-Breaker Restrike Protection
Overview of Function
The Circuit-breaker restrike protection function:
•
Monitors the circuit breaker against restriking, for example, caused by an overvoltage over the circuit-
breaker poles after switching off a capacitor bank
•
Generates a backup operate signal in case of a circuit-breaker restriking
Structure of the Function
The Circuit-breaker restrike protection function is used in the Circuit-breaker function group. A maximum
of 2 functions can operate simultaneously within the function group.
[lo_strrestrike_2014-03-05.vsd, 2, en_US]
Figure 6-257 Structure/Embedding of the Function
The function logic is grouped into the parts shown in Figure 6-258. In the following chapter, these logic parts
are described in detail.
[lo_respro-210113-01.vsd, 1, en_US]
Figure 6-258 Logic Overview of the Function
Function Description
Plausibility Release
The function Circuit-breaker restrike protection issues a trip command to a superordinated circuit breaker,
usually the infeed circuit breaker of a busbar. Overfunction of this protection can cause extreme problems for
the whole application.
The logic of plausibility release strongly reduces the risk of a false start of the function by adding an extra
release criteria for a function start.
Each criterion can be switched on or off individually.
6.42
6.42.1
6.42.2
6.42.3
Protection and Automation Functions
6.42 Circuit-Breaker Restrike Protection
SIPROTEC 5, Overcurrent Protection, Manual 853
C53000-G5040-C017-8, Edition 07.2017
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