Operation
124 Revision 03 * INSTALLATION AND OPERATING INSTRUCTIONS 8DJH * 500-8067.9
20 Cable testing
20.1 Cable testing via cable plugs
Isolating and earthing
the feeder under test
Ö Disconnect the feeder under test.
Ö Make sure that the feeder in the opposite substation has also been isolated and
secured against reclosing.
Ö Verify safe isolation from supply.
Ö Earth the feeder.
Preparations Ö Remove the cable compartment cover.
Ö Undo the screw-type cone at the T-plug or at the adapter.
Ö Fit cable test equipment (e.g. measuring bolts) according to the operating
instructions of the plug manufacturers.
DANGER!
Cable testing with connected cables represents a special stress for the isolating
distance. If the busbar of the switchgear under test or the opposite substation are live
with operating voltage, adequate measures must be taken in order to prevent
overvoltages. Normally, the switch-disconnector is not interlocked during
the cable test.
Ö Fit switching prohibition signs.
Ö Secure the locking device (option) with a lock.
ATTENTION!
In cable panels type K, the switching operation for the EARTHED position has no
influence on the voltage state of the radial cable behind the screwed-on cable
compartment cover.
Ö Before removing the screwed-on cable compartment cover, isolate and earth
the radial cable in the opposite substation.
a
Bushing
s
Measuring bolt
d
Test lead
f
Earthing connection of cable
shield
g
Earthing connection of plug
h
T-plug
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