Sonel LKZ-1500, User Manual, Page: 43 / 60

LKZ-1500-
LITE ● LKZ-1500 – USER MANUAL
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5.2.3.3 Tracing of damaged insulation and grounding area
Cable insulation failure relative to the ground with the resistance of hundreds Ohm may be locat-
ed with insulation control sensors
– A-frame/DKI-E. Connect the Transmitter in accordance with
Fig. 38 . The grounding wire shall be connected to the Transmitter jack with the marking. The
methods of locating are generally the same as those described in sec. 5.2.1 and 5.2.2.
In case the cable insulation resistance relative to the ground does not allow the use of the insula-
tion control, the method of phase tracing may be applied. It is optimum when the earth leakage im-
pedance can be up to 0.5 MΩ.
The area of damaged insulation shall be determined initially with a reflection-coefficient meter.
One operator only locates by this method, and no additional sensors are required.
Fig. 38 Connecting diagram and signal strength for the method of insulation damage tracing
with insulation control
Fig. 39 Connecting diagram and phase shift at the phase method
of cable insulation failure locating
A-frame
SENSOR input signal strength
Earth fault location
SENSOR
SENSOR
SENSOR
SENSOR SENSOR
mV mV mV
mV mV
Hz Hz Hz Hz Hz Hz Hz
Hz
Hz Hz
Ground
Earth fault location
LKN-1500
TRACE