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6. Servicing
6.1. Interruption devices in general
If the devices had to be cleaned during the inspections,
according to what is specified in par. 9.2.1., use the following
procedure:
•
insulate the working area and make it safe, respecting the
safety regulations specified in the IEC/DIN VDE Standards;
• general cleaning of surface:
– 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 domestic cleanser;
• cleaning insulating surface and conductive parts:
– 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!
6.2. Actuator and transmission system
Servicing must be carried out after 10,000 operations both for
the actuator (snap-on box) and for the shock absorber.
note
Dismantling and replacement of the operating mechanism
(snap-on box) can only be carried out by Abb personnel or
by qualified and specially trained personnel, especially for the
necessary adjustments.
6.3. Servicing details
•
If provided, turn off the spring charging motor power supply
and manually discharge the operating mechanism springs
by closing and opening the circuit-breaker.
•
Replace parts subject to high climatic or mechanical
stresses (contact an Abb service centre).
note
These operations can only be carried out by Abb personnel
or suitably qualified and specially trained personnel.
6.4. Vacuum interrupters
The vacuum interrupters are maintenance-free up to the
maximum number of electrical operations.
The operating life of the vacuum interrupter is defined by the
sum of the ultimate currents corresponding to the specific
type of interrupter: when the sum of the ultimate currents is
reached, the complete VI must be replaced, for electrical life
ask to Abb.
note
Dismantling and replacement of the interrupter assembly
can only be carried out by Abb personnel or by qualified
and specially trained personnel, especially 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 DC test voltage of the circuit-
breaker 15-40 kV
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.
