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11.3.3. Circuit-breaker pole
The circuit-breaker pole and relative vacuum interrupter are maintenance-free up to the maximum
number of electrical operations foreseen for the type of interrupter (see para. 9.2. Trip curves).
The operating life of the vacuum interrupter is defined by the sum of the ultimate currents corre-
sponding to the specific type of interrupter in accordance with what is indicated in the graphs of
par. 9.2. Trip curves: when the sum of the ultimate currents is reached, the complete pole must be
replaced.
Dismantling and replacement of the pole can only be carried out by ABB personnel or suitably qualified
and specially trained personnel, especially for the necessary adjustments.
To carry out the interrupter test without dismantling the circuit-breaker pole, use:
– the VIDAR vacuum tester, made by the company Programma Electric GmbH, Bad Homberg v.d.H.
To check vacuum tightness of the interrupter, the following test values must be set on the VIDAR
tester:
Rated voltage of the circuit-breaker
12 kV
17.5 kV
The test must always be carried out with the circuit-breaker open with the contacts at the nominal
distance (12 kV and 17.5 kV).
Procedure for testing the degree of vacuum of the interrupter of the circuit-breaker poles:
– turn the power supply off and make the working area safe by following the safety regulations
specified in the IEC/DIN VDE Standards;
– open the circuit-breaker;
– earth a terminal of each circuit-breaker pole;
– connect the earth terminal of the VIDAR tester to the circuit-breaker structure;
– connect the high voltage terminal of the VIDAR tester to the terminal of the circuit-breaker pole
not connected to earth (L1 phase) and carry out the test. Repeat the test for phases L2 and L3.
The tester connection cables can produce an indication due to the capacitive effect. In this case the
cables must not be removed.
11.4. Repairs
Replacement of spare parts and accessories must only be carried out by ABB personnel or suit-
ably qualified and specially trained personnel.
Always work with the circuit-breaker open and locked so that it cannot be closed again, with the
work area insulated and made safe.
The capacitors must be discharged.
All power supply sources must be disconnected and made safe against any reclosing during
removal and installation work.
Should maintenance be carried out by the customer's , responsibility for the interventions
remains with the customer. The replacement of parts not included in the "List of spare parts"
(para. 13.1.) must only be carried out by ABB personnel. In particular:
– complete pole with bushings/connections
– actuator
– transmission system.
d.c. test voltage
40 kV
40 kV
Note
Note
Warning!
33
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