Megger TDS40, Operating Manual, Page: 34 / 71

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Fig. 13: Selection of the test voltage
The test voltage level can be adjusted in steps of 1 kV up to the maximum test voltage of
the system by turning the knob / push-button (Fig. 3, item 6). The adjusted test voltage
level has to be confirmed by pressure on the knob / push-button (Fig. 3, item 6). Now it is
possible to adjust the test time:
Fig. 14: Selection of the test time
The test time can be adjusted in steps of 1 min from 5 min up to 45 min and in steps of 5
min from 45 min up to 90 min test duration at maximum by turning the knob / push-button
(Fig. 3, item 6). The adjusted test time has to be confirmed by pressure on the knob /
push-button (Fig. 3, item 6).
Use the information given in DIN VDE 0276 - 620 and 0276 - 621 as a guideline to start
from. These standards recommend a test level of 3 x Uo and a test duration of 30 or 60
minutes, respectively.
When you follow these guidelines, the test level is near the peak voltage of a 50 Hz test (2 x
U0 rms).
For sheath tests with DC voltage, the test voltage should not exceed 3 kV for PVC cables or
5 kV for PE cables respectively.
VLF mode
20kV
*15min
Set test time ? OK?
VLF mode
*20kV
15min
Set Voltage ? OK?