Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1996-07-03
1998-08-11
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324117R, G01R 120
Patent
active
057931968
ABSTRACT:
A measuring device for measuring time varying differential-mode currents flowing in first and second conductive groups includes a low reluctance magnetic circuit including first and second portions defining first and second openings positionable to surround the first and second conductive groups. The magnetic circuit comprises a twisted loop which cancels common-mode flux produced by common-mode current flowing in the first and second conductive groups.
REFERENCES:
patent: 2146555 (1939-02-01), Arey
patent: 2729788 (1956-01-01), Schweitzer, Jr.
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patent: 2883622 (1959-04-01), Lenehan
patent: 3332863 (1967-07-01), Woods
patent: 3431487 (1969-03-01), Savage
patent: 3582774 (1971-06-01), Forgacs
patent: 4263549 (1981-04-01), Toppeto
patent: 4912396 (1990-03-01), Groenenboom
patent: 5590031 (1996-12-01), Mead, Jr. et al.
Karlsen Ernest F.
Sundstrand Corporation
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