Technical Guide P92x/EN TD/E11
Technical Data
MiCOM P921-P922-P923 Page 23/30
6. CONTROL FUNCTIONS SETTINGS
6.1 Circuit breaker state monitoring
The MiCOM P921-P922-P923 relays monitor the state of the circuit breaker using
either 52a and/or 52b signals.
6.2 Circuit breaker control
It is possible to control the circuit breaker via the communication (RS232 or RS485
links).
Setting Range Step Size
Close pulse time 0.1 to 5 s 0.05 s
Trip pulse time 0.1 to 5 s 0.05 s
6.3 Circuit Breaker Condition Monitoring
Setting Range Step Size
Nb. Operations Alarm 0 – 50000 1
Open time alarm 0.1 – 5s 0.1s
Close time alarm 0.1 – 5s 0.1s
7. LOGIC EQUATIONS
2 or 4 logic equations are available. The associated timers are :
Time delays Settings Step size
tOPERATE 0 – 3600s 0.1s
tRESET 0 – 3600s 0.1s
8. VT RATIOS
The primary and secondary rating can be independently set for each set of VT inputs,
for example the residual VT ratio can be different to that used for the phase voltages.
Voltage ranges
Primary Secondary
57 – 130V 0,1 – 100kV
step = 0.01kV
57 – 130V
step = 0.1V
220 – 480V 220 – 480V
step = 10V
220 – 480V
step = 10V
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