Apparatus for sensing current transformer primary current as a f

Details Apparatus for sensing current transformer primary current as a f Apparatus for sensing current transformer primary current as a f

1979-05-16

1981-06-30

Moore, David K.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324117R, G01R 102

Patent

active

042765102

ABSTRACT:
The secondary winding of a current transformer is driven by a high frequency AC source to excite the core to alternating, uniformly equal positive and negative peaks of current excitation. An inductance sensor alternately senses the secondary winding inductances at corresponding points adjacent the positive and negative peaks of the flux wave generated in the core. Any difference in these inductances is a function of low frequency primary current and is utilized to develop a current flowing through a tertiary core winding to equalize these inductances. This tertiary winding current thus becomes a precise measure of the primary current.

REFERENCES:
patent: 3857096 (1974-12-01), Gregory
patent: 3882387 (1975-05-01), Vikstrom
patent: 3986115 (1976-10-01), Huang

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