ABB Relion REM601 - Circuit Breaker Failure Protection; Functionality; Principle of Operation

Section 4 1MDU07212-YN Rev. D
Protection and Control Function
20 REF601 / REJ601 / REM601
Application Manual
The phase discontinuity protection will be inhibited when all phase currents fall
below 0.1 x In.
The protection could be blocked by settings or via binary input of the relay.
Table 10: Setting ranges Phase discontinuity protection
Parameter
Value (Range)
Start value, ‘I2/I1>”
10…100%, in steps of 1%
Operate delay time, ‘tI2/I1>’
0.1 … 64 sec, in steps of 0.1
Block the phase discontinuity
protection
0 = No, 1 = Yes
Operation accuracy
± 5.0% of set value
Operation time accuracy
3% of set or ± 30 ms
Reset ratio
0.98
4.5 Circuit breaker failure protection
4.5.1 Functionality
The circuit breaker failure protection function provides re-trip and back-up trip
signal in case circuit breaker under operation fails to open. Function is activated by
trip commands from the protection functions or via external protection trip using
binary input.
The function has two independent timers for trip purposes: a re-trip timer for the
repeated tripping of its own breaker and a back-up timer for the trip logic operation
for upstream breakers.
The protection could be blocked by settings of the relay.
4.5.2 Principle of Operation
The operation of the breaker failure protection can be described using a module
diagram.