ABB eVD4, Инструкция по установке и обслуживанию, Страница: 57 / 72

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9.3.3. Circuit-breaker pole
The circuit-breaker pole and relative vacuum interrupter are
maintenance-free until the maximum number of electrical
operations for the type of interrupter is reached (see par.
7.2.3. Trip curves).
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 par. 7.2.3. Trip curves: when the sum of the ultimate
currents is reached, the whole pole must be replaced.
Note
Dismantling and replacement of the pole can only be carried out by ABB personnel
or by skilled and specially trained personnel, particularly with regard to the neces-
sary adjustments.
To carry out the interrupter test without dismantling the
circuit-breaker pole, use:
– the VIDAR vacuum tester, manufactured by the 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 d.c. test voltage
12 kV 40 kV
17.5 kV 40 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 circuit-
breaker pole interrupter:
– turn the power supply off and make the working
area safe by following the safety regulations
specified in the IEC/DIN VDE Standards;
– remove the RBX615 device (see paragraph 5.3.7.);
– 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.
Note
The tester connection cables can produce an indication due to the capacitive ef-
fect. 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 personnel.
Always work with the circuit-breaker open and locked so that
it cannot be closed again, with the work area isolated and
made safe.
The operating mechanism spring must be released.
All power supply sources must be disconnected and made
safe against reclosing during removal and installation
operations.
Should maintenance be carried out by the
customer’s personnel, responsibility for the
interventions remains with the customer.
Replacement of parts not included in the “List of
spare parts/accessories” (par. 12.1.) must only be
carried out by ABB personnel. In particular:
– complete pole with bushings/connections
– actuator and transmission system
– closing spring set
– opening spring
– shock-absorber.