Maintenance
Maintenance plan
L51--003EN/03
6/6
06--2004
E ALSTOM
Detail of maintenance operations, continued
Electrical densimeter
thresholds
Check the electrical contact SF
6
densimeter thresholds.
If the values found are outside required tolerances replace the densimeter.
Tightening of
mountings
Check and adjust, with a torque wrench, the tightening torques of screws on
sub--assemblies not subjected to gas pressure. The tightening torques are
given in paragraph ”Tightening torques”.
Relay operation
Checkrelayoperationbyexecutingthefollowingcircuit--breakersequences :
-- closing lock--out,
-- automatic opening,
-- anti--pumping.
Tightening
LV terminals
With the electric cubicle out of service, check that the connectors and tips of
conductors are tightened correctly and check the torque of connection
mountings.
Tool used : 4 mm diameter screw driver , for terminals of the ”Entrelec” type
(for example).
CAUTION : SCREWS ON TERMINALS MUST NOT BE
OVER-- TIGHTENED.
Insulating envelopes
Checktheconditionof insulatingenvelopes, theseshouldbefreefromimpact
marks, splintering, cracks, dust deposits, pollution etc...
If necessary, clean these using a dry rag.
If anomalies are found contact :
ALSTOMT&DSA,After--sales Serviceinordertochangethe defectiveparts.
Interrupting
chambers
Check the condition of interrupting chambers. This operation necessitates
complete dismantling of the interrupting chamber to gain access to the
elements to be inspected and should obligatorily be performed by ALSTOM
T&D SA, After--sales Service -- to be contacted before all operations of this
kind, preferably at the maintenance planning stage.
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