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Completion /
Cancellation of a test
A running test can be completed / interrupted in various ways.
The user can interrupt the test by means of the following:
• Activation of the Stop button with the aid of the rotary encoder
• Pressing the “HV OFF” button
In addition, the test is automatically interrupted in the following cases:
• A condition of the safety circuit is no longer fulfilled (see section 4.2).
• A severe deviation of the test voltage has occurred.
• The test object has experienced a voltage breakdown.
If none of these criteria occur over the entire duration of the test, the test is successfully
completed.
In all these scenarios, the voltage source is deactivated and the HV output discharged at
the same time as the cancellation / completion of the test.
A result screen informs the user of the progress of the test and, if applicable, the reason
and time point of cancellation.
Saving log data
If a USB stick is plugged in the slot (see section 4.1) at the conclusion of a test, log data
(see chapter 7) are automatically saved to this stick and saving is confirmed in the test's
result screen. If not, the user is prompted through a notice on the result screen to insert
the USB stick.
If the prompt is ignored and the screen is instead acknowledged, the data are not
saved.
When the stick is inserted into the USB slot, it can take up to 10 seconds until the notice
on the screen disappears and the successful saving of the log data is confirmed.
Sheath pinpointing If a voltage breakdown took place during a sheath test or if the measured leakage currents
do indicate the presence of a sheath fault, the fault position can be immediately pinpointed
with the test system serving as voltage source.
For this purpose, a button to switch to pinpointing mode becomes visible right after the
sheath test has been finished.
After the mode has been switched and HV clearance has been granted, the test system
applies a pulsed DC voltage to the screen of the cable under test. The test current coming
from the pulsed DC source is flowing into the ground at the point of fault and results in a
maximum step voltage at the fault. This peak can be located with an earth fault locator
(e.g. ESG 80-2). When approaching
the fault position, the step voltage increases and
decreases after the fault with a change in polarity.
For detailed information on how to pinpoint a sheath fault, please refer to the operating
instructions of the earth fault locator in use.
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