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The operating life of the vacuum interrupter is
defined by the sum of the ultimate currents
corresponding to the specific type of interrupter in
accordance with what is indicated in the graphs of
7.2.3. Trip curves: when the sum of the ultimate
currents is reached, the complete pole must be
replaced.
Note
Dismantling and replacement of the interrupter assembly can only be carried
out by ABB personnel or by qualified and specially trained personnel, espe-
cially for the necessary adjustments.
To carry out the interrupter test use the VIDAR
vacuum tester, of the Electric GmbH, Bad Homberg
v.d.H. company Programme.
To check vacuum tightness of the interrupter, the
following test values must be set on the VIDAR tester:
Rated circuit breaker
voltage
Rated circuit breaker
voltage
The test must always be carried out with the circuit
breaker open with the contacts at the nominal
distance.
Procedure for testing the degree of vacuum of the
interrupter:
• cut off the voltage in the working area and make it
safe in accordance with the safety regulations
specified in the IEC/DIN VDE Standards;
• open the circuit breaker;
• earth a terminal of each circuit breaker phase;
• 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 not connected to earth of the
interrupter (L1 phase) and carry out the test. Repeat
the test for phases L2 and L3.
Note
The tester connection cables can produce an indication due to the capacitive
effect. In this case the cables must not be removed.
9.3.4. Lubrication
• Visually inspect the lubrication conditions of the
tulip isolating contacts, the sliding surfaces, etc.
Lubricate if necessary.
• Check correct electrical and mechanical operation
of the various devices, particularly with regard to
the interlocks. Lubricate if necessary.
9.4. Repairs
Replacement of spare parts and accessories must
only be carried out by ABB personnel or suitably
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 operating mechanism springs 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 personnel, responsibility
for the interventions remains with the
customer. The replacement of parts not
included in the “List of spare parts”
(par. 10.1.) must only be carried out by
ABB personnel.
In particular
• complete interrupter assembly with
connections
• actuator and transmission system
• group of closing springs
• opening spring
• shock absorber.
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