Megger TDS40, Руководство по эксплуатации, Страница: 43 / 71

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6. Optional Features
6.1 Detection of Breakdown and Short Circuit
Systems with the optional breakdown and short circuit detection offers the following
additional functions:
The test voltage will be immediately switched off in any case of a breakdown in the cable
under test. The status message "Cable break down" is indicated on the display.
The level of the break down voltage is indicated on the display. That value is represented
as storage voltage (i.e. in parentheses).
In case of a short circuit (test voltage < 5% of rated voltage), the test voltage will be
switched off. The status message "Cable cannot be charged" is indicated on the display.
Fig. 29: Breakdown detection
6.2 Measurement of Leakage Current
If a system is equipped with the optional Leakage Current measurement, the leakage
currents of the test object are indicated on the display during the test.
During charging period, the instantaneous measurement values are indicated on the
display. Afterwards, the VLF final values are indicated on the display. The final values (test
voltage and leakage current) are represented in brackets. Change-over to the
representation of the instantaneous measurement values (values without parentheses or
brackets) and back can be carried out by activating the F2 key.
If the test and diagnosis system has been additionally equipped with the logging option or
protocol printout option, these measurement values can be additionally filed and printed
out respectively.
VLF mode
20kV
15min
6:32
(20.1kV)
(0.19mA)
Breakdown in cable