Method of finding faults in a branched electrical distribution c

Details Method of finding faults in a branched electrical distribution c Method of finding faults in a branched electrical distribution c

1993-02-12

1994-11-29

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324534, G01R 3111

Patent

active

053693663

ABSTRACT:
A PN modulated signal is applied to an end of a network electrical distribution circuit. The signal produces a snapshot trace of energy reflected from various discontinuities along the circuit, including a fault. Because the fault absorbs a large part of the energy in the applied signal, reflections from discontinuities in the same branch as the fault but farther from the input are reduced in amplitude. By knowing the position of the branches and various discontinuities, such as transformers, the position of the fault can be logically determined. If the fault is a high resistance fault a high voltage pulse is applied to the end of the circuit. The PN signal is initially sensed at a time when the fault has a low resistance because of arcing due to the high voltage pulse.

REFERENCES:
patent: 5083086 (1992-01-01), Steiner
patent: 5185579 (1993-02-01), Mertens et al.

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