Operation | 9
163/174
500-8384.9 • Version 11 • Installation and Operating Instructions • 8DJH
9.10 Cable testing
9.10.1 Cable testing via cable plugs
DANGER
Mortal danger due to non-interlocked switch-disconnector
If the cable compartment cover is removed, the switch-disconnector is not interlocked
during the cable test. Switching to CLOSED position can cause an internal arc or an electric
shock.
⇨ Observe the Five Safety Rules.
⇨ Fit switching prohibition signs.
⇨ Padlock the locking device (option).
WARNING
Mortal danger due to overvoltages
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, no overvoltages may occur.
⇨ Overvoltages must be avoided by suitable measures taken by the switchgear operator.
NOTICE
High test voltage
The test voltage can damage connection cables, cable plugs and voltage detecting systems.
⇨ Observe the manufacturer information related to the connection cables, cable plugs and
voltage detecting systems (maximum test values).
a
d
s
g
h
f
1
Bushing
2
Measuring bolt
3
Test lead
4
Earthing connection of cable shield
5
Earthing connection of plug
6
T-plug
Tab. 52:
Test voltages
Rated voltage of
switchgear
Test voltage
AC test voltage VLF
1)
0.1 Hz
AC
DC
Rectangle
Sinus
Test dura-
tion
U
ct
Test dura-
tion
U
ct
Test dura-
tion
Mean value
Maximum
value
Mean value
Maximum
value
[kV]
[kV]
[min]
[kV]
[min]
[kV]
[kV]
[kV]
[kV]
[min]
7.2
11
1
22
15
22
22
15.6
22
60
12
19
1
38
15
38
38
26.8
38
60
15
28
1
52
15
52
52
36.8
52
60
17.5
28
1
52
15
52
52
36.8
52
60
24
38
1
72
15
72
72
51
72
60
1)
Very low frequency
1. Disconnect the feeder under test.
2. Make sure that the feeder in the opposite substation has also been isolated and secured
against reclosing.
Summary of Contents for 8DJH
Page 173: ......
