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Table 6 Periodical inspection and detailed inspection
Location
Contactor as
Appearance
a whole
Insulating
Material
Operating
Sliding parts
devices
Spring
Electromagnets
Latch
mechanism
Closing coil,
trip coil
Fastenings
Primary
Terminal,
circuit
movable
conductor
Interrupter
Vacuum
Contact wear
Vacuum
container
Vacuum level
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What to inspect
Abnormal appearance
damage
Check if moisture or
dust adheres to the
insulator.
Under dusty environments,
frequent inspection
should be done.
Check for wear, loose or
seized parts.
Rust, deformation,
discoloration, or damage.
Discoloration, rust,
wear, or loose mounting.
Check for scores and
wear
Check for discoloration
and burned parts.
Check for loose bolts or
nuts.
Discoloration of terminal
and coupling conductor,
loose fastenings.
Check contact wear and
wipe.
Check moisture and dust
adhering to the surface.
Check vacuum level by
withstand voltage test.
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１７ -
Decision criteria
What to do
Check by sight.
Replace broken
Parts.
Check by sight.
Clean.
Check bye sight.
Clean parts and
If necessary,
remove foreign
check correct
matters.
operation.
Pour oil in
Also check loose
Adequate amount.
fastenings.
Check by sight.
Retighten.
check the
If necessary,
tightness.
investigate the
cause and replace
parts.
See Table 7.
Replace vacuum
Interrupter.
Check by sight.
Clean.
Apply AC17kV
If found abnormal,
for 1minutes.
inform the maker.
6F9G0154
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