Cb Trip Conversion Logic Diagram; Monitor Checks For Cb Closure; Figure 88: Circuit Breaker Trip Conversion Logic Diagram (Module 63) - GE P4A Technical Manual

P54A/B/C/E
5.21.1

CB TRIP CONVERSION LOGIC DIAGRAM

530
Trip Inputs A
531
Trip Inputs B
532
Trip Inputs C
Tripping Mode
3 Pole
858
AR Force 3 pole
533
Force 3Pole Trip
529
Trip Inputs 3 Ph
530
Trip Inputs A
531
Trip Inputs B
532
Trip Inputs C
892
Pole Dead A
893
Pole Dead B
894
Pole Dead C
V03386

Figure 88: Circuit Breaker Trip Conversion Logic Diagram (Module 63)

5.22

MONITOR CHECKS FOR CB CLOSURE

For single-phase Autoreclose neither voltage nor synchronisation checks are needed as synchronising power
should be flowing in the two healthy phases. For three-phase Autorelcose, for the first shot (and only the first shot),
you can choose to attempt reclosure without performing a synchronisation check. The setting to permit
Autoreclose without checking synchronising conditions is CB SC Shot 1.
Otherwise, synchronising checks on voltages, relative frequencies, and relative phase angles are needed to ensure
that sympathetic conditions exist before CB closure is attempted.
The following diagrams detail the Monitor Checks for CB closure.
P54xMED-TM-EN-1
1
&
1
1
≥
2
&
1
& 1
1
&
1
&
1
1
1
1
Dwell
100 ms
Chapter 7 - Autoreclose
S
523
Q Trip Output A
R
S
524
Trip Output B
Q
R
S
525
Trip Output C
Q
R
S
526
Trip 3 ph
Q
R
522
Any Trip
S
527
2/3 Ph Fault
Q
R
S
528
3 Ph Fault
Q
R
173