Operation & Maintenance Manual
23
COMMISSIONING
ELECTRICAL SWITCHING SEQUENCE FOR GIS INCOMING/ OUTGOING FEEDER PANEL
Q0 Circuit Breaker Q1 / Q4 Busbar disconnecting switch Q2 / Q3 Earthing Switch
(Q1 & Q2, Q3 & Q4 incorporated in one 3 position switch)
5) SWITCHING SEQUENCE TO CONNECTING BUS B TO EARTHING. AND TO DISCONNECTING BUS B FROM EARTHING.
DURING ELECTRICAL OPERATION DO NOT INSERT OPERATING HANDLE
Note: The below operating sequence is standard operating sequence. If any key interlocks / key exchange are provided please refer
key interlock arrangement provided by Design.
SWITCHING SEQUENCE
INITIAL STATUS
Q1 - OFF
Q0 - OFF
Q2 - OFF
CONNECTING BUSBAR
TO EARTHING
Q2 - OFF to ON
Q4 - OFF to ON
Q2 - ON
Q4 - ON
Q0 - OFF
Q0 - OFF to ON
DISCONNECTING BUSBAR
FROM EARTHING
Q2 - ON to OFF
Q4 - ON to OFF
Q0 - ON toOFF
Q0 - OFF
Q2 - ON
Q4 - ON
STEP - 0
Q4 - OFF
Q3 - OFF
Q1 - OFF
Q1 - OFF
Q3 - OFF
Q3 - OFF
Q1 - OFF
Q3 - OFF
Q3 - OFF
Q1 - OFF
STEP - 1
STEP - 2
STEP - 3
STEP - 4
BUS A
Q1
Q2
BUS B
Q4
Q3
BUS A
Q1
Q2
BUS B
Q4
Q3
BUS A
Q1
Q2
BUS B
Q4
Q3
BUS A
Q1
Q2
BUS B
Q4
Q3
BUS A
Q1
Q2
BUS B
Q4
Q3
Q0
Q0
Q0
Q0
Q0
