Maintenance
Maintenance plan
L51--003EN/03
5/6
06--2004
E ALSTOM
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
ALSTOM T&D S.A.
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.
Makesurethat thepermanentresistorsareworkingproperlyby checkingthat
these give off heat andthat thereare nooverheating marks (a zonenotorious
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.
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.
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