Cable Testing; Cable Testing Via Cable Plugs - Siemens 8DJH Installation And Operating Instructions Manual

Operation
Isolating and earthing the
feeder under test
Preparations
112/121
22

Cable testing

22.1

Cable testing via cable plugs

DANGER
High voltage! Danger!
➭ Isolate.
➭ Secure against reclosing.
➭ Verify safe isolation from supply.
➭ Earth and short-circuit.
➭ Cover or barrier adjacent live parts.
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.
➭ Fit switching prohibition signs.
➭ Secure the locking device (option) with a lock.
ATTENTION
The cables, cable plugs and voltage detecting systems may be damaged by too high test
voltages.
➭ Observe the specifications of the manufacturers of the cables, cable plugs and voltage
detecting systems (maximum test values).
➭ Disconnect the feeder under test.
➭ Make sure that the feeder in the opposite substation has also been isolated and secured
against reclosing.
➭ Verify safe isolation from supply.
➭ Earth the feeder.
➭ Remove the cable compartment cover, see page 76, "Removing and mounting the cable
compartment cover".
➭ Remove the voltage transformers on the testing section and close the bushings in a
surge-proof way.
➭ Undo the screw-type cone at the T-plug or at the adapter.
➭ Fit cable test elements (e.g. measuring bolts) according to the operating instructions of the
plug manufacturers.
Revision 05 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DJH • 500-8067.9
① Bushing
② Measuring bolt
③ Test lead
④ Earthing connection of cable
shield
⑤ Earthing connection of plug
⑥
T-plug