Unshielded air-coupled current transformer

Details Unshielded air-coupled current transformer Unshielded air-coupled current transformer

1994-11-14

1996-05-28

Kozma, Thomas J.

Inductor devices

With closed core interrupted by an air gap

336175, 336184, 336212, H01F 2724, H01F 2730

Patent

active

055215726

ABSTRACT:
An air-coupled current transformer is provided with a primary current conductor and two secondary coils connected such that the emf induced in each coil by an external disturbing magnetic flux is subtractive, whereas the emf induced by the current in the primary is additive. Two ferromagnetic core pieces enhance the rejection of the emf induced by the disturbing flux. Ceramic spacers are inserted into air gaps between the core pieces for maintaining the gaps fixed to keep the scale factor of the transformer independent of temperature.

REFERENCES:
patent: 1415505 (1922-05-01), Angus
patent: 2148641 (1939-02-01), Reich
patent: 3195082 (1965-07-01), Wetherill et al.
patent: 3268843 (1966-08-01), Popp
patent: 3525964 (1970-08-01), Stevenson
patent: 3546565 (1970-12-01), Downing et al.
patent: 4800356 (1989-01-01), Ellis
"Current Transformers", H. E. Forrest, Electrical Review, Jul. 9, 1948, pp. 51-54.

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