Cable fault locating apparatus having an earth current canceller

Details Cable fault locating apparatus having an earth current canceller Cable fault locating apparatus having an earth current canceller

1977-11-14

1979-07-17

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3108

Patent

active

041616880

ABSTRACT:
The cable fault locating apparatus employing an inverted Murray bridge circuit having a ratio arm connected to open ends of a faulty cable and a sound return cable, a voltage source connected through a switch to both ends of the ratio arm and a galvanometer connected between the output terminal of the ratio arm and the ground is characterized by an earth current canceller connected either in series or parallel with the galvanometer so as to cancel a stray earth current.

REFERENCES:
patent: 3800216 (1974-03-01), Hamilton
patent: 3812420 (1974-05-01), Gunter

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