Three-Phase Follower Timing Logic Diagram; Circuit Breaker Autoclose; Figure 173: Three-Phase Follower Cb Timing Logic Diagram (Module 29) - GE MiCOM P40 Technical Manual

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THREE-PHASE FOLLOWER TIMING LOGIC DIAGRAM

CB1 open 3 ph

En CB 1 Follower

CB2 open 3 ph

En CB 2 Follower

Follower Time

Autoclose logic takes effect when dead times have expired.

The Autoclose logic checks that all necessary conditions are satisfied before issuing an Autoclose command to the

circuit breaker control scheme.

Before a circuit breaker can be closed, it must be healthy (sufficient energy to close, and if necessary re-trip) and it

must not be in a lockout condition.

For three-phase Autoreclose, the circuit breaker must be open on all three phases and the appropriate system

check conditions must be met. For single-phase Autoreclose, the circuit breaker must be open on that phase.

The Autoclose command is a pulse lasting 100 milliseconds. Another command (Set CB Close) to set the circuit

breaker to close is asserted as well as the Autoclose command. This signal will remain set either until the end of

the Autoreclose cycle, or until the next protection operation. These commands are used to initiate the Reclaim

Time logic and the Autoreclose Shot Counter logic.

P446SV-TM-EN-1

Chapter 11 - Autoreclose

3 P Follower Time

CB13 PFTCOMP

CB23 PFTCOMP