Method and apparatus for detecting faults in buried insulated co

Details Method and apparatus for detecting faults in buried insulated co Method and apparatus for detecting faults in buried insulated co

1975-08-11

1976-11-09

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 54, 324 67, G01R 3108, G01R 3128

Patent

active

039913635

ABSTRACT:
An electrical leakage path fault in the insulation of a buried conductor is located by first applying a composite signal comprising a test signal and a carrier signal modulated by the test signal between the conductor and earth. The two components of the composite signal are then sensed at locations along the path of the conductor. The sensed carrier signal is used by itself while its modulation content is used with the sensed test signal to trace the conductor to the fault.

REFERENCES:
patent: 1672933 (1928-06-01), Edwards et al.
patent: 2176755 (1939-10-01), Borden
patent: 2176757 (1939-10-01), Borden
patent: 2425554 (1947-08-01), Nelson et al.
patent: 2641633 (1953-06-01), Hosford
patent: 2731598 (1956-01-01), Herbert
patent: 2966627 (1960-12-01), Hawkins
patent: 3299351 (1967-01-01), Williams
patent: 3526831 (1970-09-01), Smith
patent: 3792350 (1974-02-01), Bossler et al.

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