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5.11.3 3-PHASE DEAD TIME LOGIC DIAGRAM

V03340

CB1L3PAR

DT Start by Prot

Protection Reset

DTOK CB1L 3P

3PDTCOMP

DTOK All

OK Time 3P

AR Start

CB1L3PAR

Logic 1

3PDTCOMP

Seq Counter = 1

Seq Counter = 2

Seq Counter = 3

Seq Counter = 4

3P AR DT Shot 1

3P DTime1&

3P AR DT Shot 2

3P AR DT Shot 3

3P AR DT Shot 4

3P DTime2

3P DTime3

3P DTime4

3P Dead Time IP

3PDTCOMP

CB1L3PAR

CB13PDTCOMP

3P DTime

Figure 75: Three-phase Dead Time logic diagram (Module 25)

5.12 CIRCUIT BREAKER AUTOCLOSE

Autoclose logic takes effect when dead times have expired.

The Autoclose logic checks that all necessar

y 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

Chapter 7 - Autoreclose P54A/B/C/E

162 P54xMED-TM-EN-1

Brand	GE
Model	P54C
Category	Relays
Language	English

GE P54C User Manual

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GE P54C Specifications

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