ABB VD4 Installation And Operating Instructions Manual page 29

M E D I U M V O LTA G E P R O D U C T S
The test must always be carried out with the
circuit breaker open with the contacts at the
nominal distance (12 to 17.5 kV).
Procedure for testing the degree of vacuum of the
interrupter of the circuit breaker poles:
• turn off the power supply and make the working
area safe by following the safety instructions
specified in the IEC/DIN VDE Standards;
• open the circuit breaker;
• earth a terminal of each circuit breaker pole;
• connect the earth terminal of the VIDAR tester to
the circuitbreaker 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 conduct
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.
Screw tightness inspection
10 Nm
10 Nm
Figure 11
9.4 Repairs section
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 springs of the operating mechanism must be
discharged.
All power supply sources must be disconnected
and made safe to prevent them from reclosing
during the removal and installation work.
If maintenance is 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" (sect. 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.
15 Nm
29