Apparatus for determining load currents

Details Apparatus for determining load currents Apparatus for determining load currents

1996-08-16

1998-02-17

Berhane, Adolf

Electricity: power supply or regulation systems

For phase shift or control

Using transformer

G05F 170

Patent

active

057194890

ABSTRACT:
A compact power circuit configured for circuit breaker applications includes, in one embodiment, a plurality of current transformers, each current transformer being coupled to a respective one of the phase lines of a power line to generate a current proportional to the current in the respective one of the phase lines. The circuit also includes a plurality of operational amplifiers, each of the operational amplifiers being coupled to a respective one of the current transformers. The operational amplifiers generate the phase signals v.sub.a, v.sub.b and v.sub.c respectively. A neutral phase signal Vn is generated by a current transformer coupled to the neutral phase line of the power line. A ground fault signal is generated from the vector sum of signals v.sub.a, v.sub.b, v.sub.c and V.sub.n.

REFERENCES:
patent: 3959720 (1976-05-01), Bose et al.
patent: 4068159 (1978-01-01), Gyugyi
patent: 4092592 (1978-05-01), Milkovic
patent: 4447843 (1984-05-01), Massey
patent: 4799005 (1989-01-01), Fernandes
patent: 5198746 (1993-03-01), Gyugyi et al.
patent: 5499155 (1996-03-01), Gershen et al.

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