Method of nondestructively establishing an earth gradient for ca

Details Method of nondestructively establishing an earth gradient for ca Method of nondestructively establishing an earth gradient for ca

1986-01-24

1987-09-29

Strecker, Gerard R.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

G01R 3110

Patent

active

046971378

ABSTRACT:
A fault is located in an insulated electrical conductor buried in earth by establishing a voltage gradient through the earth emanating from the fault, and thereafter sensing the direction of the gradient to locate the fault. The voltage gradient is established by applying a pulsed voltage initially to the conductor at a voltage level significantly less than the maximum voltage level of which the voltage source is capable. The presence or absence of a voltage gradient as a result of such initial voltage level is sensed and, if no gradient has been established, the voltage level is increased somewhat and reapplied, but at a level still significantly less than the maximum level of which the voltage source is capable. After the voltage gradient has been established, the voltage level varies within a range no higher than the initial voltage level at which the gradient was established, so as to maintain the voltage gradient.

REFERENCES:
patent: 1212467 (1917-01-01), Evershed
patent: 2176757 (1939-10-01), Borden
patent: 2837714 (1958-06-01), Hill
patent: 3199023 (1965-08-01), Bhimani
patent: 3792350 (1974-02-01), Bossler et al.
patent: 3991363 (1976-11-01), Lathrop
patent: 4117397 (1978-09-01), Fukao et al.

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