Device for measuring with direct current the total resistance of

Details Device for measuring with direct current the total resistance of Device for measuring with direct current the total resistance of

1976-09-23

1978-05-16

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

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324DIG1, 361 42, G01R 2702

Patent

active

040901270

ABSTRACT:
Instrument for measuring the total resistance of the protection circuit, that is to say of the phase-to-earth circuit the electric shock may possibly pass through. The modification made in Wheatstone's bridge (two condenser placed between the couples of vertices) allows a side of the bridge to be replaced through a circuit containing electromotive force. However, the alternate voltages involved do influence neither the direct ones utilized for measuring the unknown earth resistance nor the zero-instrument. Feeding is carried out through a Graetz bridge, to which a suitable resistance was added to avoid short-circuits on a side of the same bridge.

REFERENCES:
patent: 1956538 (1934-04-01), Ridings et al.
patent: 2883618 (1959-04-01), Nuut
patent: 3001120 (1961-09-01), Bereskin
Stout, Basic Electrical Measurements, Jan. 1955, pp. 64, 65.
Dep't. of the Army Technical Manual, TM 11-669, Transients and Waveforms, Nov. 1951, pp. 13-15.

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