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4.3.2 Changing the Test Settings
Changing the
operation mode
To select the operation mode, select Mode from the settings menu (see page 18).
Menu item Description
VLF-Sinus In this mode, the test object is tested with a true VLF sine wave voltage
of up to 24 kV
RMS
(33.9 kV
peak
) and a frequency of between 0.01 Hz and
0.1 Hz (settable).
DC+ In this mode, the test object is tested with positive DC voltage of up to
33.9 kV.
This mode is especially useful for testing the dielectric strength of a
newly laid or disconnected cable (particularly for paper insulated cables).
DC-
In this mode, the test object is tested with negative DC voltage of up to
33.9 kV.
This mode is especially useful for testing the dielectric strength of a
newly laid or disconnected cable (particularly for paper insulated cables).
VLF-
Rectangle
In this mode, the test object is tested with a rectangular AC voltage with
an amplitude of up to 33.9 kV and a frequency of between 0.01 Hz and
0.1 Hz (settable).
The slew rate is automatically adapted.
This mode is especially suitable for start-up testing of the dielectric
strength of a newly laid or disconnected cable.
Sheath
Test
In this mode, the sheath of the test object (e.g. a newly laid cable
system) is tested with negative DC voltage of up to 10 kV.
Sheath
Pinpointing
In the case that the results of a sheath test do indicate the presence of a
sheath fault, the sheath pinpointing mode can be used to immediately
pinpoint the fault position by means of the step voltage method.
Thereby, the fault position is pinpointed with a pulsed DC voltage of up
to 10 kV and a duty cycle of either 1:3 or 1:4.
Back This menu item is used to return to the settings menu (see page 18).
VLF-Sinus
Back
Rectangle
VLF-Sinus
DC-
DC+
Test
Pinpointing
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