Toshiba HCV-6KALU Instruction Manual page 23

MAINTENANCE
Table 2 – Check Points for Periodic Inspection (cont.)
Check Check Item
Point
Main Circuit Dust on
surface of
vacuum
interrupter
Insulating Dust, foreign
Frame and matter or
Flanges damage
Control Auxiliary
Circuits Switch
Drive unit
Wiring
Insulation Resistance
Resistance from main
Measure- circuit to
ment ground
Resistance
from control
circuits to
ground
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Check Method
Visual inspection. Make sure there is no
dust on the surface.
Visual inspection. Make sure there is no
dust, foreign matter or
breakage.
See Table 3. Contact wear and wipe.
Make sure there is no
dust.
Visual inspection. Check for overheating
and discoloration.
Visual inspection. Check for discoloration
Tighten using a and tightness.
screwdriver.
Measure insulation Resistance should be
resistance between
50M Ω or greater.
phases, between
electrodes, and
between circuits and
ground. Megger test
at 1000V.
Measure insulation Resistance should be
resistance between
1M Ω or greater.
circuits and ground.
Megger test at
500V.
Criteria What to do
Wipe with a clean,
dry cloth.
Wipe with a clean,
dry cloth. If
damaged, contact
Toshiba.
Replace if wear or
damage is
excessive. See
Table 1 for
tightening torque
specifications
Replace if damaged.
Repair if
disconnected.
Tighten if loose.
See Table 1 for
tightening torque
specifications.
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. If
necessary, replace
faulty parts.
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