Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1988-03-18
1989-12-12
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324107, 324127, G01R 1148, G01R 1120
Patent
active
048870293
ABSTRACT:
A mutual inductance differential current transducer employs a toroidal coil mounted coaxially and generally centrally of the length of an alternating current conductor wiht a conductive sheet therebetween surrounding the conductor and of substantially the same length and in insulated relationship from the conductor. The axial length of the coil is less than approximately one-third the length of the conductor, and the toroidal cross-section has a longer leg parallel to the axis of the conductor and a cross-sectional area eliminating the need for external capacitive and magnetic shielding. The coil is wound with an integer number of layers of the same number of turns per layer, the total number of turns being selected to produce a predetermined range of voltage levels of the analog voltage signal output of the coil, produced in response to and representative of the differential current flow through the conductor. The coil is wound utilizing only conventional toroidal coil winding controls with resultant winding defects in each layer producing corresponding abberations in the analog voltage signal output, the abberations of the respective such contributions for the corresponding, plural integer number of layers being substantially self-cancelling and thereby maintaining the substantially linear responsive character of the analog voltage signal output of the coil.
REFERENCES:
patent: 3299385 (1967-01-01), Stein
patent: 3449703 (1968-03-01), Steen
patent: 3559133 (1971-01-01), Van Dice
patent: 4272724 (1981-06-01), Wada et al.
patent: 4413230 (1983-11-01), Miller
patent: 4491790 (1985-01-01), Miller
patent: 4621231 (1986-11-01), Heinrich et al.
patent: 4742294 (1988-05-01), Gallios
Burns W.
Eisenzopf Reinhard J.
Studebaker R. R.
Westinghouse Electric Corp.
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