Interval
1 year
3 years
3 years
3 years
In case of
accidental impact
3 years or 100,000
trips at the rated
current
3 years
5 years
5 years
3 years
3 years
3 years
1 year
Operation
The contactor must operate normally.
The insulating parts must be free of any accumulation of dust,
dirt, any cracks, traces of surface discharges or damage.
The elements must be free of any deformation, accumulation
of dust, dirt or any damage. The screws, nuts and bolts must
be tightened correctly.
Check that the interrupter is free of any accumulation of dust,
dirt, cracks, traces of surface discharge or damage.
Carry out a voltage test with the contacts open at 15 kV-50 Hz
for 1 minute. If there is a discharge during the test, the interrupter
must be replaced since this phenomenon means a deterioration in
the degree of vacuum. If necessary, contact ABB service.
Refer to section 9.2.2 below.
Check correct operations and signals.
Check whether the cable ties are loose or broken and check
the connections are tight.
Check the seal over the spring register is intact
Check tightness and absence of any traces of overheating or
oxidation:
Check tightness of the connections.
As per routine test report
Close the contactor and carry out the opening operation
(emergency). The contactor opens normally.
1
2
3
4
5
6
7
8
9
10
11
12
Description
Carry out 5 mechanical closing and opening operations
Visual inspection of the insulating parts
Visual inspection of the structure and mechanisms
Inspection of the interrupter
Erosion of the interrupter contacts
Auxiliary contacts
Auxiliary circuit conductors
Contactor springs
Power connections
Earthing contact
Insulation resistance
Opening pushbutton of the mechanical latching (if
provided)
46
U N I G E A R Z V C
M E D I U M V O L T A G E P R O D U C T S
General guidelines are given in the table below: