Circuit for measuring the ground resistance of an ungrounded pow

Details Circuit for measuring the ground resistance of an ungrounded pow Circuit for measuring the ground resistance of an ungrounded pow

1976-09-09

1978-01-03

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 62, G01R 3102, G01R 2708

Patent

active

040669505

ABSTRACT:
A measuring circuit for measuring the ground resistance of an ungrounded power circuit, particularly a d-c system supplied from a converter circuit in which a series circuit including an a-c voltage generator, a measuring resistor and a coupling member is connected between the object of the measurement and ground and an evaluation circuit including a phase sensitive rectifier circuit forms the unknown ground resistance by dividing the active component of the current driven by the generator voltage through the series circuit into the voltage between the measurement object and ground.

REFERENCES:
patent: 3281681 (1966-10-01), Stevenson
patent: 3284705 (1966-11-01), Dobson
patent: 3935512 (1976-01-01), Falk et al.
patent: 3967191 (1976-06-01), Roche
patent: 3973185 (1976-08-01), Beak et al.

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