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