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9.3.3. Circuit-breaker pole
The circuit-breaker pole and relative vacuum in-
terrupter is maintenance-free up to the maximum
number of electrical operations foreseen for the
type of interrupter (see par. 7.2.3.).
The operating life of the vacuum interrupter is
defined by the sum of the ultimate currents cor-
responding to the specific type of interrupter in
accordance with what is indicated in the diagrams
of par. 7.2.3: when the sum of the ultimate cur-
rents is reached, the complete pole must be re-
placed.
Note
Dismantling and replacement of the operating
mechanism (snap-on box) 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 disman-
tling the circuit-breaker pole, use:
– the VIDAR vacuum tester, of the Programma
Electric GmbH, Bad Homberg v.d.H. company.
To check vacuum tightness of the interrupter, the
following test values must be set on the VIDAR
tester:
Rated circuit-breaker
DC test voltage
voltage
12 kV
40 kV
17.5 kV
40 kV
24 kV
60 kV
The test must always be carried out with the
circuit-breaker open with the contacts at the
nominal distance (12 to 24 kV).
Procedure for testing the degree of vacuum of
the interrupter of the circuit-breaker poles:
– insulate the working area and make it safe by
following the safety rules specified in the IEC/
DIN VDE Standards;
– open the circuit-breaker;
– earth a terminal of each circuit-breaker pole;
All manuals and user guides at all-guides.com
– connect the earthed 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.
Note
The test connection cables may produce an in-
dication due to the capacitive effect. In this case
the cables must not be removed.
9.4. Repairs
Replacement of spare parts and accessories
must only be carried out by ABB personnel or
suitably qualified and specially trained person-
nel.
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 dis-
charged.
All power supply sources must be disconnected
and made safe against any reclosing during re-
moval and installation work.
Should the maintenance be carried out
!
by the customer's personnel, respon-
sibility for the interventions remains
with the customer.
The replacement of parts not included
in the list "List of spare parts/accesso-
ries" (par. 12.1.) must only be carried
out by ABB personnel. In particular:
– complete pole with bushings/connec-
tions
– actuator and transmission system
– set of closing springs
– opening spring
– shock absorber.
41
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