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Page 20 MAINTENANCE
Table 2 – Check Points for Periodic Inspection (cont.)
Check
Point
Check Item Check Method Criteria What to do
Dielectric
Strength
Measure
main circuit
Measure dielectric
strength between
phases and between
circuits and ground.
10kV AC or 14kV DC for
1 minute.
If breakdown occurs,
contact Toshiba.
Open/Close
Operation
--- Perform open/close
operation by electric
operation test to
confirm the correct
operation.
--- If not normal, check
and repair. If
necessary, replace
faulty parts.
Table 3 - Gap/Wipe Standard Values (contactor in new condition).
Parts
Gap Wipe Allowable Wear
Vacuum
Interrupter
Normally
energized
type
0.091-0.098 in.
(2.3-2.5 mm)
0.091-0.102 in.
(2.3-2.6 mm)
0.051 in. (1.3 mm)
a-contact
0.157±0.016 in.
(4±0.4 mm)
0.118±0.012 in.
(3±0.3 mm)
b-contact
0.157±0.016 in.
(4±0.4 mm)
0.118±0.012 in.
(3±0.3 mm)
Auxiliary
Switch
Delayed
b-contact
0.098±0.012 in.
(2.5±0.3 mm)
0.177±0.020 in.
(4.5±0.5 mm)
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