Sonel S-36 VLF, User Manual

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S-36 VLF
– USER MANUAL
19
The device automatically carries out a load test in
which the capacity of the tested object is deter-
mined internally.
If the load capacity is within the permissible range
(see
sec. 7 Technical specifications), the VLF test
will now start automatically.
The measured output voltage is displayed as true
RMS value in the upper area of the screen.
In the lowermost display line, the selected test time
and test time that has already expired are indicat-
ed.
Leakage current measurement
During the VLF test the ammeter is disabled. Otherwise the charging current and not the leak-
age current would be displayed.
But during the VLF test, you can also measure the leakage current. To this end, press the but-
ton
[VLF Current measurement] .
The VLF test will then be continued up to the next negative voltage half-wave. Shortly before
the peak voltage is reached, the device stops to activate the ammeter. After a few seconds, the
leakage current can be read. If need be, the current measurement range has to be changed
with the selector switch.
After completing the measurement, do not forget to select again the greatest
measurement range (10 mA). The leakage current measurement is automatically
completed after 30 seconds. However, you can also prematurely abort the meas-
urement by pressing the button
[VLF Current measurement] . The VLF test will
then be automatically resumed.
Breakdown detection
If the test object is damaged or defective, the insu-
lation will be punctured during the test, the break-
down will be automatically detected and the time at
which the breakdown occurred determined.
See sec. 4.3.3 Terminating the test .
Breakdown!
after 011:13 min
at 36.0 kV
Output voltage:
36.0 kV rms 0.1 Hz
Test time:
21:16 of 060 min
Load Test!
1.9 µF