Putting Into Service - ABB ConVac Installation And Operation Instruction Manual

24 C O N V A C V A C U U M C O N T A C T O R I N S T A L L A T I O N A N D O P E R A T I O N I N S T R U C T I O N
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6. Putting into service

6.1 General procedures
Before putting the apparatus into service, carry
out the following operations:
• 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 isolating
contacts of the withdrawable contactors
• carefully clean the sheets and insulating parts
with brushes with clean dry cloths
• 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 contactor vacuum interrupter has
not been damaged due to accidental impacts
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Table 6a
Item inspected
1 Insulation resistance
2 Auxiliary circuits
3 Drive. Open/closed indicator,
operation counter
4 Fuse connections, fuse
protectors
5 truck operation and interlocks
6 VT primary/secondary
protection fuse
All the operations regarding putting into
service must be carried out by ABB personnel
or by suitably qualified customer personnel
with in-depth knowledge of the apparatus
and of the installation.
Procedure
Medium voltage circuit With a 2500 V megger, measure
the insulation resistance between the phases and the
exposed conductive part of the circuit.
Check that the connections to the control circuits are
correct: proceed with the relative power supply.
Carry out a few closing and opening operations of the
contactor.
Check if the screws are fastened, and the snap spring
and fuse protectors are installed correctly
Execute several racking-in/out operations
Execute several close/open operations
Check the compliance of operation logic with clause 5.7.3
Check the fuse at primary side
• make sure that all the barriers and protective
shields are correctly installed
• carry out the inspections indicated in table 6a
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.
Contactors with self-supplied VTs shall pay special
attentions to the following items:
• Remove the fuse at the VT primary side while
performing the withstand voltage test of the
main circuit
• Remove the fuse at the VT primary and
secondary side while performing the withstand
voltage test of the control circuit
• Only the DC resistance test method is allowed
for primary loop resistance testing
Positive check
The insulation resistance should
be at least 50 MΩ and remains
stable.
Operations and signals normal.
Operations and signals normal.
Assembling and protector status
all correct
Operations and status normal
Operations and status normal