3-15
External voltage
protection (optional)
If external voltage protection is available, the external voltage detector monitors
presence of AC voltage at the HV output (from ‘standby’ mode onwards)
1000 VAC, a system message appears
and a continuous warning signal sounds. An
internal circuit breaker
then separates the HV output from the rest of the HV system in the
device. This prevents the test object from discharging.
The operator must rectify the cause of the fault and then press the clear
continue using the system.
In some operation modes, the external voltage detector is disabled by default (see
sections 4.4.1 Hipot Operation Mode and 4.4.3 Sheath Fault Testing / Pinpointing)
Devices equipped with the optional external vol
tage protection do not discharge the
cable under test, if an abrupt power outage (e.g. power failure) takes place. In that
case, the cable under test has to be manually discharged and grounded.
Even in the case of an abrupt switch-off using the power swi
equipped with exter
nal voltage protection does not discharge the cable under test.
Thus, it is recommended to use the HV off
button (7) to terminate a running test in
order to ensure proper discharging of the cable under test. Afterwards,
can be switched off using the power switch.
Emergency off switch
If the system detects that the emergency off switch has been pressed, it is switched to
the ‘standby’ state. A system message appears to notify the operator.
The operator must rectify the cause of the fault and then press the clear
continue using the system.
Emergency off
clear
External voltage
clear
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