Maintenance
Maintenance p lan
P51--0001EN/02
6/6
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
Contact densimeter
thresholds
Check the SF
6
contact densimeter thresholds.
If the values are outside tolerances, replace the densimeter.
Tightening the
fasteners
Check and readjust the tightening torque values of the fixings for
unpressurised components using a torque wrench. The tightening torque
values are those incicated in the module ”T ightening torque values.”
Operation
of the relays
Check the relays are functioning by carrying out the following circuit
breaker sequences :
-- locking the closing,
-- automatic opening,
-- antipumping,
Tightening the
terminals
L.V.
With the electrical cabinet turned off, make sure the cable lugs or end
pieces are tightly on the electrical conductors, and check the tightening
torque of the connection fasteners.
CAUTION : THE TERMINAL SCREWS MUST NOT BE TIGHTENED
TOO MUCH.
Insulating enclosures
Check the state of the insulating enclosures. They must have no traces of
shocks, bursting, cracks, deposits, dust, pollution, etc.
If necessary clean the insulating enclosures with a dry cloth.
In case of anomaly in the state of the insulating enclosures contact :
ALSTOM Grid, After Sales Service, in order to envisage changing the
deteriorated parts.
Breaking
chambers
Check the state of the breaking chambers. This operation requires the
complete dismantling of the breaking chamber for access to the
components that must be inspected, and must be carried out by ALSTOM
Grid, After Sales Service, who should be contacted prior to any operation
of this type, at the time of scheduling.
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