Regulating transformer with magnetic shunt

Details Regulating transformer with magnetic shunt Regulating transformer with magnetic shunt

1978-08-29

1980-06-03

Kozma, Thomas J.

Inductor devices

Polyphase

323 56, 336165, 336172, 336184, 336215, H01F 2108

Patent

active

042064341

ABSTRACT:
A regulating power transformer has a DC-shunt control arranged so that coupling between the primary and secondary windings of the transformer over substantially the entire range from 5% to 95% of rated line input may be achieved, with low harmonic component and low voltage distortion in the output. A DC-shunt, having a cross-section at least equal to any single path AC magnetic flux core leg is interposed between primary and secondary windings placed on the core legs, with an air gap between each end of the shunt member where it is contiguous to a core leg, and a DC control winding is arranged through at least one window formed in the shunt member. The AC reluctance through the shunt member and the air gaps at each end is less than the AC reluctance in the principal magnetic path between the primary and secondary windings, so that when there is zero DC current in the DC control winding, there is substantially no coupling between the primary and secondary windings, with substantially all of the magnetic flux established by the primary winding being shunted through the shunt member.

REFERENCES:
patent: 1376978 (1921-05-01), Stoekle
patent: 2245192 (1941-06-01), Gugel
patent: 2500189 (1950-03-01), Landis
patent: 2802981 (1957-08-01), Hobart et al.
patent: 2864993 (1958-12-01), Schober
patent: 3360753 (1967-12-01), Wroblewski
patent: 3622868 (1971-11-01), Todt

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