Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-06-03
1976-02-17
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
317131, 336179, 336183, G01R 3312, H01H 4726
Patent
active
039394034
ABSTRACT:
A measuring coil comprises two windings, each being formed by winding simultaneously two insulated wires having the same size, the two wires of each winding extending side by side. The windings formed by the single turns of the wires in each winding are interconnected in such a way that the magnetic effects are additive in the wires of a first of said windings and subtractive in the wires of the second winding. The single turns of the first wire in each of the two windings form the measuring coil to be fed by an alternating current and the single turns of the second wire in each of said two windings form both a sensing element for measuring the temperature of the measuring coil and/or a heating element to be fed by an adjustable direct current for maintaining the coil temperature at a predetermined value with a high accuracy.
REFERENCES:
patent: 2568587 (1951-09-01), MacGeorge
patent: 2795697 (1957-06-01), Nagel
patent: 3378763 (1968-04-01), Hastings
patent: 3434047 (1969-03-01), Brickner
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