Maintenance
Maintenance p lan
P51--0001EN/02
5/6
01--2011
© ALSTOM 2010. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be
relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is
provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is
strictly prohibited.
GRID
Details of maintenance operations, continued
Pressure of SF
6
gas
If the circuit breaker has a ”dial densimeter” for SF
6
gas, check the
position of the needle.
Position of
the needle
Colour zone Instructions
GREEN Nil
YELLOW
Carry out
an additional
filling
RED
Density
abnormally low, search
for a new leak
and contact
ALSTOM Grid
After--Sales
Department.
NOTE : If the needle is either in the yellow zone or in the red zone,
with no particular indication from the contact densimeter, make sure teh
informationis correct then find the defective component and replace it.
Operating
mechanism
The air vents must be clean, free of dust, and unobstructed. If encessary,
clean them with solvent.
Make sure the permanent resistors are functioning by observing the heat
they give off and the absence of traces of overheating (area obviously
burned).
For thermo--stat resistors, use a thermostat to check they are turned on
and off properly at the power supply terminals (recommended theromstat
temperature : +5°C
If necessary change the defective resistors.
For the opening damper, if a leak is observed, contact
ALSTOM Grid, After Sales Service to change it.
Operation
counter
Read the operating counter(s), write the reading in the ”Maintenance visits”
monitoring document.
The number of circuit breaker operations determines subsequent
maintenance operations.
Continued on next page.
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