GE SF6, Instruction Manual

Page: 174 / 300

Maintenance
Maintenance plan
GE Information
08- 2016 L51- 004EN/07
6/8
Detail of maintenance operations , continued
SF
6
pressure gas For a circuit- breaker equipped with a ”dial- type” SF
6
gas densimeter, check
the position of the needle.
Needle position Colored area Direction
GREEN None
YELLOW
Perform a topping- up
operation.
RED
Abnormally low density,
find the origin of the
leak and contact
Grid Solutions
After- sales Service .
NOTE : If the intersection is in either the yellow or red zone, without
any particular indication from the electrical contact densimeter, verify
the concordance of different information sources to find the defective
element and then replace it.
Operating device
Air- vents should be clean, free of dust and unobstructed. If necessary clean
using a solvent.
Make sure that the permanent resistors are working properly by checking that
these give off heat and that there are no overheating marks (a zone notorious
for this).
For thermally controlled resistors, check that energizing and de- energizing
takes place correctly at voltage supply terminals by means of a thermostat
(recommended thermostat temperature: +5
_
C.
If necessary, change resistors found to be defective.
For the opening damper, if any leak is observed, please contact
Grid Solutions, After- Sales Department, to proceed with any changes
Operation counter
Read indications given by the counter(s) and note these on the inspection
sheet ”Maintenance visits”.
The number of circuit- breaker operations recorded influences future
maintenance operations.
Continued on next page.