4kv room breaker numbers on 4KV1-4
- 4KV1-2 are 52/1 through 52/14
- 4KV3-4 are 52/15 through 52/28
-52/29 and up are not in the 4KV room
4KV room layout
- Starting from 4KV1 to the right
- 4KV1-4KV2-4KV3-4KV4-SST2B-480V2B-480V3-SST2C-SST2A-480V1-480V2A-DS bus
SST-2D and 480V4 are on the NE corner
480V5 and SST-2E are in the nook
MCC-5 normal power and alternate power?
- Normal power from E-1
- Alternate power from DS bus through kirk key breaker across from WGDP.
IB alternate power
- All IB panels (1-4) can be alternately powered from 480V Bus 3 via MCC4-MCC8
- Only 1 IB can be alternately powered at one time
Energizing Dead Bus operation
-when a breaker is operated to energize a dead-bus, the breaker switch should be held 4 to 8 seconds to allow time for the UV coil to be energized.
125VDC DP-A provides control power to?
MCC-A
- 480V Busses 1, 2A, and E-1
- 4KV Busses 1 and 2
125VDC DP-B provides control power to?
MCC-B
- 480V Busses 2B,3 and E-2
- 4KV Busses 3 and 4
Control Power for 480Bus 4?
-125VDC MCC-B-A (powered from MCC-B0
Control power for 480Bus 5?
-It provides its own control power.
Switchyard Disconnects
- Are manually operated unlike breakers.
- All 3 phases disconnect at the same time.
- Only operated after OCB’s are open
OCB in switch yard indication?
- To revieve open indication on the RTGB all 3 phases of the OCB must be open.
- Only 1 Phases has to be close to get a Close indication on the RTGB
Main Transformer fans and oil pumps power supplies?
- Normal power 480V Bus 1 via PP-63
- Alternate power MCC-17 via PP-64
UAT fans and oil pump power supplies?
- Normal Power 480Bus 1 via PP-63
- Alternate power from MCC-4
115KV SUT fans and controls
- Normal PP-90
- Alternate PP-91
-LTC powered by PP-92
230KV SUT fans and controls
-Normal PP-91
Alternate PP-90
-LTC powered by PP-93
