3.2.6.16 Combined restart inhibit and restart enable signal
The restart inhibit signals from the motor thermal protection, negative-sequence
overcurrent and motor startup protection function are combined in an OR-gate to
obtain a common restart inhibit signal. This signal is also connected to the
disturbance recorder and it provides a LED indication on the LHMI.
The restart inhibit signal is inverted to a restart enable signal. The restart enable
signal is active, if the emergency start is activated or if both the common operate
signal and the common restart inhibit signals are inactive. The restart enable signal
is connected to the disturbance recorder. The signal provides a LED indication on
the LHMI and is available as an output at PSM PO4 with a minimum alarm time of
80 ms.
3.2.7 Supervision functions
3.2.7.1 Trip circuit supervision TCSSCBR
Two instances of the trip circuit supervision function are used for supervising
Master trip 1 and Master trip 2. Function continuously supervises trip circuit and
alarms in case of a failure of a trip circuit. The function block does not perform the
supervision itself but it is used as an aid for configuration. To prevent unwanted
alarms, the function is blocked when any of the protection function's operate
signals is active or the circuit breaker is in open position.
An additional instance of the trip circuit supervision function is used to check the
proper functioning of the closing circuit of the motor circuit breaker. To prevent
unwanted alarms, the function is blocked when the circuit breaker is in closed
position.
The function gives an indication via a LED on the LHMI on detection of any of the
trip circuit failure. Also individual trip circuit alarm indications are connected to
the disturbance recorders.
3.2.7.2 Fuse failure and current circuit supervision SEQRFUF, CCRDIF
The fuse failure and current circuit supervision functions give an alarm in case of a
failure in the secondary circuits between the voltage transformer or current
transformer and the IED respectively. The set of three phase currents and voltages,
I3P and U3P, are connected to the inputs.
An alarm is available on failure of the secondary circuits. Alarms are recorded by a
disturbance recorder.
3.2.7.3 Circuit-breaker condition monitoring SSCBR
The circuit-breaker condition monitoring function checks for the healthiness of the
circuit breaker. The circuit breaker status is connected to the function via binary
1MRS756785 A Section 3
REM630 variants
REM630 37
Application Manual
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