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27
USER MANUAL
5.2.1
Insulation fault finding by signal drop.
The technique is the same for all types of sensors.
Both operators shall stand in trail over the axis of the target line
(for the DKI-E sensor) or both pins of the sensor shall be put into the
soil for survey as shown in Figure 13.
The point of insulation failure may be defined by the signal peaks
when one pin/operator is directly over the place of break. The signal
drops to it minimum when the point of insulation failure gets between
the pins/ operators. When you work near the area of failure, move
the pins closer to each other (to make their coordinate positions more
clear) and reduce the steps.
When the long-distance insulation failure takes place, the signal
peaks are located distantly from each other, on the bounds of failure.
The signal null is between the bounds of insulation damage.
To make a precise tracing you may define the polarity of signal at the
SONDE input. For this, switch the mode of double-frequency signal
of «1024 and 512Hz» and set the operating frequency of the Tracer
to the level of «1042» at the SONDE input. The indication of current
direction becomes active automatically, if the two-frequency signal
strength is sufficient (Figure 4, Pos. 6).
Figure 13
– Insulation fault finding by signal drop
When the operator moves along the undamaged part of the utility,
and then moves directly over the damaged area, the chaotic change
(or missing) of polarity at the SONDE input may occur because of
weak signal (see Figure 13).
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