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Page 28
Table 2. Check Points for Inspection (cont'd)
Check Point
Check Item
Auxiliary
Terminals loose
Switch
or disconnected
Case/contacts
Control
Smooth
Circuits
movement of
motor charging
mechanism
Terminals loose
or disconnected
Insulation
Measure main
Resistance
circuit to ground
Measure-
ment
Measure
between main
circuit terminals
Measure control
circuits to
ground
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Check Method
Visual
Make sure terminals are
inspection.
not loose or disconnected.
Tighten using a
screwdriver.
Visual
Make sure there is no
inspection.
damage or warping.
Energize the
Breaker (motor-operated
control circuit.
type) should charge
quickly and smoothly.
Visual
Make sure terminals are
inspection.
not loose or disconnected.
Tighten using a
screwdriver.
Megger test at
Resistance should be
1000V.
500MΩ or greater.
Megger test at
Resistance should be
1000V.
100MΩ or greater.
Megger test at
Resistance should be
500V.
2MΩ or greater.
MAINTENANCE
Criteria
Repair if
disconnected.
Tighten if loose.
See
Table 1 for
tightening torques.
Replace if damaged
or warped.
If the circuit fails to
operate, check the
cause and repair.
Repair if
disconnected.
Tighten if loose.
See
Table 1 for
tightening torques.
If the insulation
resistance is low,
wipe off the vacuum
interrupter and other
insulation surfaces
with a clean dry
cloth and then
repeat the test.
What to do
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