Unbalanced current detector for three phase electrical system

Details Unbalanced current detector for three phase electrical system Unbalanced current detector for three phase electrical system

1981-09-21

1983-12-27

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

328133, 324140R, G01R 2500

Patent

active

044233744

ABSTRACT:
An unbalanced current detector for a three phase electrical system of the type including a current transformer (4, 6, 8) for each phase (.phi.A, .phi.B, .phi.C) and a burden resistor (16) which receives a rectified output of the current transformer is disclosed. The harmonic content of a rectified ripple voltage developed across the burden resistor (16) is applied to a filter (20) for extracting desired frequencies and rejecting other frequencies, and the filter output is applied to a level detecting and amplifying circuit (54) the output of which is applied to an indicator (77) to indicate an unbalanced current condition.

REFERENCES:
patent: 3783341 (1974-01-01), Beckwith
patent: 4199798 (1980-04-01), Leppke et al.

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