Grounding system test apparatus

Details Grounding system test apparatus Grounding system test apparatus

1983-12-14

1986-09-02

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

307252T, G01R 3102

Patent

active

046098658

ABSTRACT:
The apparatus is used in conjunction with a power center or distribution box of a multi-phase trailing cable resistance grounded power system in coal mines and the like. It provides from phase voltage an adjustable low voltage current source for adjusting the ground fault relay. The voltage is obtained from a phase-controlled triac and is rich in harmonics which makes it useful in locating cable faults in conjunction with any commercially available cable fault detector which operates at power or higher frequency.

REFERENCES:
patent: 3697809 (1972-10-01), Self
patent: 3971007 (1976-07-01), Borkovitz
patent: 4135129 (1979-01-01), Johnson
RCA Transistor, Thyristor and Diode Manual: Technical Series SC-15, printed Apr. 1971, pp. 56-64 and 225-226.
Electronic Design: "Single Optically-Isolated Driver Controls Inverse-Parallel SCR's", vol. 28, No. 11, p. 120.

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