Autoreclose Reset Successful Indication Logic Diagram; Cb Healthy And System Check Timers; Figure 178: Autoreclose Reset Successful Indication Logic Diagram (Modules 37 & 38) - GE MiCOM P40 Technical Manual

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Chapter 11 - Autoreclose

AUTORECLOSE RESET SUCCESSFUL INDICATION LOGIC DIAGRAM

Res AROK by UI

Reset AROK Ind

Res AROK by NoAR

Ext Rst CB1 AROK

Res AROK by Ext

Res AROK by TDly

AROK Reset Time

Res AROK by UI

Reset AROK Ind

Res AROK by NoAR

Ext Rst CB2 AROK

Res AROK by Ext

Res AROK by TDly

AROK Reset Time

Figure 178: Autoreclose Reset Successful Indication logic diagram (Modules 37 & 38)

This logic provides signals to cancel Autoreclose if the circuit breaker is not healthy (for example low gas pressure)

or system check conditions are not satisfied (for example required line & bus voltage conditions) when the scheme

is ready to close the circuit breaker.

At the completion of a dead time, the logic starts an Autoreclose healthy timer. If a circuit breaker healthy signal

becomes high before the Autoreclose healthy time is complete, the timer stops and, if all other relevant circuit

breaker closing conditions are satisfied, the scheme issues a circuit breaker Autoclose signal. If the circuit breaker

healthy signal stays low, then, at the end of the Autoreclose healthy time, a circuit breaker unhealthy alarm is

raised. This forces the Autoreclose sequence to be cancelled.

Additionally, at the completion of any three-phase dead time, the logic starts an Autoreclose check synchronism

timer. If the circuit breaker synchronism-check OK signal goes high before the time is complete, the timer stops

and, if all other relevant circuit breaker closing conditions are satisfied, the scheme issues a circuit breaker

ResCB1 ARSucc

ResCB2 ARSucc

P446SV-TM-EN-1