Operating Modes
36
Button /
Menu item
Description
Only adjustable for sheath fault pinpointing
Menu item to select the rate of the DC pulses in seconds.
Example: If a pulse rate of 1:3 produces is selected, every DC pulse with
a duration of 3 seconds is followed by a 3 second voltage dropout.
The duration of the test can be specified within a range of 1 to 90 minutes.
In the relevant standards (e.g. VDE 0276), the test duration of a sheath
test is specified as being between 5 to 10 minutes depending on the cable
type.
The setting activates the continuous operation mode that should
particularly be used for the sheath fault pinpointing.
In this submenu, the following additional parameters can be set:
Switching between manual and automatic ramp voltage.
In automatic mode, as soon as high voltage is enabled, the test
system begins voltage conditioning and charges the test object
directly up to the upper limit that has been set.
In the manual mode, the voltage must be ramped up by using the
rotary encoder. This permits a gradual increase and therefore
makes it easier to assess sudden fluctuations in current, for
example.
Once all the settings have been made, the test or pinpointing can be started with the
menu item . After which 10 seconds remain to enable high voltage with the “HV On”
button .
As soon as high voltage is enabled, the “HV Off” button lights up red signalling high
voltage at the HV output.
Depending on the setting (see above), the VLF SIN-45 test system either immediately
starts with voltage conditioning or waits for the manual adjustment of the voltage. During
sheath testing or sheath fault pinpointing the applied voltage can be manually adjusted
by means of the menu item .
pinpointing
1 s
3 s
0 kV
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