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35
USER MANUAL
In other words, when the mini-sensor is moved over the target cable
and with the axis of sensor crossing the axis of the cable, the abrupt
drop of signal over the cable may be observed. Other cables will not
cause so evident signal drop or they will not cause a signal drop
depending on the strength of the signal via the cables.
Put the mini-sensor at different angles for testing in order to avoid
false trials (you may detect a cable which goes over the sought one).
5.4.3
Check by the method of depth measurement
To check the results and eliminate errors of the measurement, apply
the module of magnetic antenna to the target cable and perform the
depth measurements. The depth readings shall be zero, other
readings mean the false trials.
5.5 Locating the line-to-ground faults of the overhead lines in the networks of
6 ~ 10 kW with isolated neutral
The search of line-to-ground faults is performed on the high-
harmonic level of zero- sequence current at the frequency of 550Hz
or 1450Hz. The faulty overhead line, which splits off from the station,
is detected according to the signal peak. The signal strength will be
much higher on the faulty line than on non-faulty one in the points
where the branches of the overhead line take place. The signal
strength behind the short-circuited area drops abruptly.