23
1mm
Item inspected
1 Insulation resistance.
2 Drive. Open/closed indicator,
operation counter
(if provided)
3 Auxiliary circuits.
Procedure
Medium voltage circuit
With a 2500 V megger, measure the
insulation resistance between the phases
and the exposed conductive part of the
circuit.
Carry out a few closing and opening
operations of the contactor.
Check that the connections to the control
circuits are correct: proceed with the rela-
tive power supply.
With the contactor open, check that the
thickness between the body of the contact
and the stem is 1 mm.
Positive check
The insulation resistance should be at
least 50 Mohm and in any case constant
over time.
Operations and signals normal.
Operations and signals normal.
Tighten the fixing screws.
TABLE 3
6. Putting into service
6.1. General procedures
All the operations regarding putting
into service must be carried out by
ABB personnel or by suitably quali-
fied customer personnel with in-depth
knowledge of the apparatus and of the
installation.
Before putting the apparatus into service, carry
out the following operations as well as those
indicated in the table:
– check that the voltage and current applied are
within the specified rated values
– check tightness of the power connections of
the fixed contactors and integrity of the iso-
lating contacts of the withdrawable contactors
– carefully clean the sheets and insulating parts
with brushes and clean dry cloths. Avoid us-
ing jets of compressed air
– check the earthing connection of the fixed
contactors
– check that no foreign bodies, such as bits of
packing, have got into the moving parts
– check that the value of the power supply volt-
age of the circuits is between 85% and 110%
of the rated auxiliary voltage of the apparatus
– check that the contactor vacuum interrupter
has not been damaged due to accidental im-
pacts. In case of doubt, carry out the check
indicated in paragraph 7.2 Table 4.
– make sure that all the barriers and protective
shields are correctly installed
– carry out the inspections indicated in table 3.
On completion of the operations indicated,
check that everything is put back in its original
position.
The check can only be considered as
passed if all the tests indicated have
had a positive outcome.
In the case of a negative check, do not
put the apparatus into service and, if
necessary, contact ABB Service.
Summary of Contents for V-Contact VSC 12
Page 1: ...V Contact VSC Installation and service instructions 7 2 12 kV 400 A ...
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Page 35: ...33 50 50 49 49 Fig 18c Fig 18b ...
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