VD4/R - VD4/L - VD4/R-SEC - VD4/L-SEC - INSTALLATION AND OPERATING INSTRUCTIONS 28
Functional test
Carry out a few opening and closing operations
with the circuit breaker not connected to the
load.
If provided, cut off the power supply to the
spring loading motor. Discharge the springs by
closing and opening the circuit breaker by
means of the closing and opening pushbuttons.
Visually inspect the lubrication conditions of the
jaw isolating contacts, of the sliding surfaces,
etc.
Make sure that the electrical and mechanical
operation of the various devices is correct, with
particular attention to the interlocks.
The screws and nuts are tightened in the factory
and correct tightening is indicated with a
coloured mark. No further tightening operations
should be required during the operating life of
the circuit breaker. However, if, following
interventions, it should be necessary to
retighten the screws or nuts, make sure that you
comply with the values indicated in fig. 11.
9.2.3 Circuit breaker pole
No further inspections are necessary beyond
those already described sect. 9.2.1.
9.3 Overhaul
9.3.1 Interruption devices in general
Comply with the following procedure if the
devices had to be cleaned during the inspections,
as specified in sect. 9.2.1:
insulate the work area and make it safe,
following the safety regulations specified in the
generally clean the surfaces:
dry and remove light deposits of dirt with a
more resistant deposits of dirt can be
removed using slightly alkaline domestic type
clean the insulating surfaces and conductive
parts:
stubborn dirt: with cold detergent type 716.
After cleaning, thoroughly rinse with clean water
and dry carefully.
Note
Only use detergents without halogens and never
1.1.1-trichloroethane, trichloroethylene or carbon
tetrachloride!
9.3.2 Actuator and transmission system:
Circuit breakers up to 25 kA
The actuator (trip box), the shock-absorber and all
the other components of the transmission system
(shaft, main levers, locking rings, etc.) must be
completely replaced after 10,000 operations.
Note
Dismantling and replacement of the operating
mechanism (trip box) can only be carried out by
ABB personnel or by skilled and specially trained
personnel, particularly as regards the necessary
adjustments.
Details about overhauling
When required, cut off the power supply to the
spring loading motor and discharge the springs
of the operating mechanism in the manual mode
by closing and opening the circuit breaker.
Replace the parts subjected to mechanical
stress or stress due to particular environmental
conditions, (contact an ABB service centre).
Note
These operations can only be carried out by ABB
personnel or by skilled and specially trained
personnel.
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 sect. 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 the indications in the graphs
of sect. 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 as
regards the necessary adjustments.
To perform the interrupter test without
dismantling the circuitbreaker pole, use:
VIDAR tester for the vacuum test, manufactured
by Programma Electric GmbH, Bad Homberg
v.d.H.
The following VIDAR tester test values are valid for
the interrupter vacuum test:
Rated voltage of the circuit breaker d.c. test voltage
—
9. Maintenance
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