ABB ConVac, Installation And Operation Instruction Manual

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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

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.

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

•

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

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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

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

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