DC current detection system for a current transformer

Details DC current detection system for a current transformer DC current detection system for a current transformer

1993-12-28

1995-10-24

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Transient or portion of cyclic

324110, 324127, G01R 1900

Patent

active

054613060

ABSTRACT:
A system for detecting the presence of an average dc current component in a load comprising a current transformer 10 for supplying a signal representative of the current, and a comparison means 12 and 13, for example a microprocessor and associated RAM, for comparing values of the current taken at time intervals corresponding to a phase interval of substantially n.pi., where n.pi. is an odd integer, of the ac periodic supply signal, so as to determine the presence of a dc current component caused by rectification of the supply. In one embodiment, the signal from a voltage detecting means 14-18 can be used to synchronise the sampling of the current at the correct phase.

REFERENCES:
patent: 4255705 (1981-03-01), Milkovic
patent: 4500837 (1985-02-01), Shuey

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