Megger TDS40, Руководство по эксплуатации, Страница: 38 / 71

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During normal operation, the voltage source is / can be switched off
- by pressing the "HVOff" key (red) (Fig. 3, item 9)
- automatically after the lapse of the test time
- automatically after a voltage breakdown in the cable under test or a short
circuit has been detected
In these cases the predefined discharging of the voltage source, back-up capacitor and
test object follows.
Fig. 20: Start menu after the test has been finished
In addition, the voltage source is / can be switched off
- by activating the “Emergency Off” switch (Fig. 3; item 1),
- by turning the HV interlock key switch (Fig. 3; item 11)
- after drop out of the operating voltage
- by removing a system card which has been inserted prior to the test (see
section 6.4)
- after detection of an internal failure (see section 7.5)
In these cases the predefined discharging of the voltage source, back-up capacitor and
test object follows too.
Attention ! The test object has to be connected to earth and shorted after termination of
the test.
You are not excused from this duty even if the complete discharge by the
internal discharging unit and the zero positioning of the residual voltage
(Fig. 3, item 2) have been performed.
In the case of an incomplete discharge of the test object the complete
discharging must be carried out by a suitable discharge rod.
After the test session has been finished, the test system has to be switched off.
Afterwards, it must be disconnected from the cable under test which has been grounded
and shorted before. Finally, the earth cable has to be disconnected.
VLF mode
20kV
15min
F1:Print
F2:Setup
Test time over