Ground conductor monitoring system

Details Ground conductor monitoring system Ground conductor monitoring system

1981-02-12

1983-11-15

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

361 42, G01R 3102

Patent

active

044158505

ABSTRACT:
A monitoring system for continuously monitoring the ground conductor of an electrical cable having power conductors and a pilot wire in addition to the ground conductor. An a.c. test signal is connected onto a loop comprised of the ground conductor and pilot wire and a terminating impedance. A current transformer samples the test signal on the ground conductor and checks its magnitude. By making the transformer impedance considerably lower than the mutual inductance between the ground conductor and pilot wire, large, expensive blocking impedances are not required to prevent the test signal from following sneak paths from the test loop to earth ground.

REFERENCES:
patent: 1539834 (1925-06-01), Gaarz
patent: 3713003 (1973-01-01), Benham
patent: 4001646 (1977-01-01), Howell
patent: 4011483 (1977-03-01), Meadows
patent: 4053815 (1977-10-01), Sircom
patent: 4071871 (1978-01-01), Kochem
patent: 4153923 (1979-05-01), Graf
patent: 4187504 (1980-02-01), Cantrell
patent: 4191946 (1980-03-01), Knox
patent: 4228475 (1980-10-01), Sherwood
patent: 4321643 (1982-03-01), Vernier
Forsyth et al.: "The Brookhaven Superconducting Cable Test Facility" IEEE Tran. on Magnetics--Jan. 1977.

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