Megger 128311841, Operating Manual

Page: 16 / 23

Operating Manual
10
HV Tester 25 kV
Before the test equipment is connected, safe isolation from supply must
be established and safeguarded in accordance with DIN VDE 0105.
The requirements of DIN VDE 0104 and DIN VDE 0105 must be
complied with. The test equipment should be connected in the following
order:
1.
Ground and short-circuit the conductor of the test object that is not
going to be tested (connect to station ground or auxiliary ground
point). In the case of ungrounded test objects, the tester can only
be used if an auxiliary ground is provided.
2. Establish a conductive connection between the station/auxiliary
ground and the ground terminal [5] of the HV Tester 25 kV.
3. In the case of mains operation the ground safety circuit checks
whether the protective ground (protective conductor terminal [7])
and station ground have the same potential. The yellow lamp
indicates that the potential is the same. If the lamp does not light
up, the potential of the station ground must be checked and a
connection established between the protective ground terminal
and the station ground. The housing of the HV Tester has the
same potential as the protective ground terminal.
4. In the case of internal or external batteries establish a
conductive connection between the protective conductor terminal
[7] and station ground.
5. Connect the high-voltage terminal [6] to the test object.
power supply
operational ground
protective ground
Figure 3 Example for connecting HV Tester 25 kV