Megger PFL22M1500 Series, User Manual

Page: 39 / 78

OPERATION
AVTMPFL22M Rev 1 April 2011
29
Surge Generation (Surge Impulse): High Voltage pinpoint location
1. Set the rotary Voltage Control knob (item 21) to the “Zero Start” position
item 9).
2. Set the Voltage Range switch (item 20) to the desired “surge” range either 8
or 16kV. At this stage the Status Bar (item 1) will glow “Red”.
NOTE: Range and function switch cannot be moved if a mode is active.
3. Set the Mode (Filter) selector switch (item 19) to the Surge and Proof Burn
group. Both lamps will illuminate, advising that either of these modes are
available.
4. Depress the Surge Mode pushbutton (item 17). Selection is confirmed by the
pushbutton remaining illuminated and the other pushbutton extinguishing.
5. Set the Surge Repetition Control (item14) to the desired repetition rate from
3secs to 30sec. The rate selected is decided by the operator based on
conditions i.e. external noise and ease of hearing the discharges via the
ground microphone.
6. Select the required voltage using the rotary Voltage Control knob (item 21).
The selected voltage being displayed on the d.c KiloVolt meter (item 13) the
Voltage Preview lamp (item 7) is illuminated indicating that the displayed
voltage is a “preview” with no HV being applied.
7. Depress the Initiate button (item 22) and the selected impulse voltage is
applied to the cable under test at the required rate as set by the surge cycle
control.
The fault is then located using the acoustic method and a suitable impulse
receiver (MPP2000).
8. To deselect depress the Surge Mode pushbutton (item 17), which also
engages the internal earthing/grounding and removes any High Voltage.
9. The Status Bar (item1) will glow “green” when all HV removed and the
instrument and test piece has been earthed/grounded.