Download Maintenance procedure

s
Maintenance
programme
Masterpact NT/NW
Level III
Issued by:
ABT Services Product Manager
Validated by:
ABT Quality Manager
Last modification
Index A
First edition
(See last page for details on modifications)
15 December 2004
Date
Warning:
For checks and preventive maintenance, the operator must take all necessary precautions to avoid injury.
Circuit-breaker test: Unless specified otherwise in the special indications below, all operations (inspection, test and preventive maintenance) must
be carried out with the circuit breaker (device and chassis) and the auxiliary circuits de-energised.
Checks to ensure that the circuit breaker is de-energised must be carried out on the upstream and downstream terminals.
Test equipment: The high voltages used for certain tests are dangerous and may result in serious injury or death. During the tests, it is strictly
forbidden for anyone to touch the circuit breaker or the conductors while voltage is applied.
Return to operation: Before putting the equipment back into operation, it is mandatory to check that all connections are made with the correct
tightening torque, the inside of the cabinet is clean, all protective covers are in position and the circuit breaker is off (open position).
Subassembly
Control and indication auxiliaries
Action
Check operation of control auxiliary XF at 0.85 Un
Goal
Check that XF closes the circuit breaker at 0.85 Un.
For a drawout device, check the electrical continuity of the wiring.
Frequency
Every 2 years
Special
indications
This test requires an external power supply. For voltages greater than 50 V DC, all
suitable measures to avoid electrocution must be taken.
Pre-test
conditions
Device
The device must comply
with the conditions
specified opposite.
Necessary tools
auxiliaries NIII_2_2.doc
Fixed
Drawout
Position of
poles
Open
Open
Mechanism
Charged
Charged
Device
position in
chassis
Connect
ed
Test
Discharged
Disconne Removed
cted
Adjustable external power supply
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