132kV GIS Local Control Cabinet Schematic Walkthrough
0:00 / 4:52
LCC overview
0:00 - 0:45
Physical specs of the 132kV LCC: dimensions, steel enclosure, mimic panel, and Local/Remote selector.
AC vs DC auxiliaries
0:45 - 1:31
How non-critical AC heaters and lighting differ from the critical 220 V DC that feeds trips, relays, and motors.
Hand-crank motor lockout
1:31 - 2:10
Inserting a hand crank depresses a limit switch and hard-wires the motor DC supply off for technician safety.
Circuit breaker -QA1 control
2:10 - 2:53
Trip-circuit supervision, anti-pumping, SF6 density blocking, and redundant Trip 2 protect the main breaker.
Bay-wide interlocking
2:53 - 3:32
Double-operation, load interlocking, maintenance lockout, and breaker-release logic prevent dangerous switching.
Status, faults, and lamp test
3:32 - 4:13
Mimic LEDs, KFAL fault relays, the PBAL1 annunciator, and lamp test keep operators informed.
Measurement and close
4:13 - 4:52
CT/VT test disconnects and the front-panel multimeter complete the LCC as the bay control interface.