Method of and apparatus for tracing faults in electrical conduct

Details Method of and apparatus for tracing faults in electrical conduct Method of and apparatus for tracing faults in electrical conduct

1988-10-24

1990-01-23

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324527, 324544, 324557, 324326, G01R 3108

Patent

active

048961175

ABSTRACT:
A high frequency and two low frequency electromagnetic signals are generated (1), the low ones being coherent with the second being a sub-harmonic of the first. The high frequency is modulated (4) by the second low frequency and applied (7,9) as a composite signal to an underground conductor, while the first low frequency is applied (9,10) additively. A receiver traversed over the line has aerials (12,21) or ground probes (24,25) for picking up these signals in separate channels. The high frequency is demodulated (18) to provide a reference signal for a synchronous detector (20) to which the first low frequency is fed. That suffers a phase reversal if there is a fault, and the output of the synchronous detector is arranged to indicate that.

REFERENCES:
patent: 3299351 (1967-01-01), Williams
patent: 4118662 (1978-10-01), Weber
patent: 4686454 (1987-08-01), Pecukonis

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