Line Tracer
18
3.2. Determining Cable Faults
Locating cable interruptions
L1
N
Ro RE
Interruption
OFF
No
signal
Receiv er R1 0K
sw itche d in
capacitive mode
Transmitter T10K
is automatically
in generator mode
Fig. 14. Determination of interruption location-electrical field caused by transmitter
disappears behind the interruption.
Locating earth fault
L1
N
Ro RE
short circuit
OFF
no
signal
Receiver R10K
sw i t che d in
inductive mode
Transmitter T10K
is automatically
in generator mode
Fig. 15. Determination of short circuit location
Electromagnetic field disappears behind the short circuit location.
Attention: Load current of Transmitter is 1 A. Therefore for the safety reasons the max.
value of RE is less then 50
Ω.
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