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M ED I U M VO LTAG E P R O D U C T S
39
39
•
If any anomalous conditions are found, appropriate
servicing measures must be taken (see the
paragraph on “Servicing).
8.8. Servicing
Interruption device in general
If cleaning is found to be necessary during the
inspections, as specified in par. “Operations before
putting into service”, use the following procedure:
•
insulate the working area and make it safe by
following the safety regulations specified in the
IEC/DIN VDE Standards.
•
general cleaning of the surfaces:
- dry and eliminate any light deposits of dirt using
a soft dry cloth;
- more resistant deposits of dirt can be removed
using a slightly alkaline household cleanser or
Rivolta BWR 210 type detergent.
•
cleaning the insulating surfaces and conductive
components:
- light dirt: with Rivolta BWR 210 detergent;
- resistant dirt: with cold 716 type detergent.
After cleaning, rinse thoroughly with clean water
and dry carefully
Note
Only use halogen-free detergents and never trichloroethane,
trichloroethylene or carbon tetrachloride!
8.9. 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.
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. “Trip curves”: when the sum of the ultimate
currents is reached, the complete pole must be
replaced.
Note
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.
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
DC test voltage
15 kV
36 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:
•
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 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 tester connection cables can produce an indication due to the capacitive
effect. In this case the cables must not be removed.
8.10. 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 drive springs must be discharged.
All power supply sources must be disconnected and
made safe against any reclosing during removal and
installation work.
CAUTION
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/accessories” must only
be carried out by abb personnel. In
particular:
•
Complete pole with bushings/connections
•
Actuator
•
Transmission system.
Summary of Contents for VM1/A/P
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