Maintenance; Checking The Cable Connections; Checking The Connecting Linkage; Checking The Control Circuits - GE GL 311 F3/4031 P/VE Operating Instructions Manual

I
NSPECTION AND
9.3

Maintenance

DANGER
DANGER
9.3.1

Checking the Cable Connections

9.3.2

Checking the Connecting Linkage

9.3.3

Checking the Control Circuits

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M
AINTENANCE
The circuit breaker must be shut down for maintenance work.
Opening the pole columns is not necessary.
• Disconnect the breaker from the high voltage system, and ground
(earth) the breaker at both ends.
• Discharge the closing and opening springs.
This state is reached when the position indicator shows OPEN
and the spring position indicator is on "discharged." The
operations shown in the table below are required to reach this
state, depending on the starting situation:
Breaker Position
CLOSED / I
CLOSED / I
OPEN / 0
OPEN / 0
Danger due to electric shock.
Therefore:
- Disconnect the breaker from the high voltage system and
ground (earth) the breaker at both ends.
Danger due to suddenly moving linkage.
Therefore:
- Discharge the closing and opening springs by carrying
out closing and opening operations.
• Check to make sure all cable connections in the mechanism
housing are tight.
• Check all the fastening and locking elements (pins, nuts, screws
and bolts) on the connecting linkage.
• Carry out test operations in accordance with the commissioning
procedure (see "Test Operations" on Page 59).
OI 250 (EN)
State of the
Closing Spring
Charged
Discharged
Charged
Discharged
Operations to Be
Executed
O-C-O
O
C-O
No operation requi-
red
REV7
/REV3