Electrostatic fork shield

Details Electrostatic fork shield Electrostatic fork shield

1986-07-03

1988-02-16

Kozma, Thomas J.

Inductor devices

Polyphase

336 84C, H01F 3300, H01F 1504

Patent

active

047258047

ABSTRACT:
An electrostatic fork shield for a layer wound transformer yielding a high degree of noise attenuation. A three phase transformer has three leg portions which are interconnected at both ends by a yoke. Around each leg portion is wound layers of primary coil and secondary coil. The transformer core, coils and shields lie within an enclosure. Both the inner wall and outer wall of each transformer coil is covered with a non-ferrous conductive shield. Between the primary and secondary coils of each phase and their respective vertical shields, is interposed a glastic spacer. A horizontal shield lies across each end of the transformer coil. The horizontal shield comprises a base and inner and outer fingers which cover a large portion of the surface of the coil ends but do not form a complete electric path around any leg portion. Two barrier shields are located on one side of the transformer between adjacent phases and are connected to the inner fingers of each horizontal shield. The barrier shields contact the outermost vertical shield of adjacent phases. Side shields are received in separate slots in the base portion of the horizontal shields. One side shield also provides support for the shield ground wire connected to both horizontal shields, the side shield and the transformer ground. Top shields and bottom shields block the space between the respective ends of the transformer coils and the nearby enclosure walls.

REFERENCES:
patent: 2114189 (1938-04-01), Kronmiller
patent: 2170048 (1939-08-01), Dunning et al.
patent: 2183355 (1939-12-01), Mauerer
patent: 2914719 (1959-11-01), Walton et al.
patent: 2937349 (1960-05-01), Camilli
patent: 3142029 (1964-07-01), Keen, Jr. et al.
patent: 3265998 (1966-08-01), Park
patent: 3277416 (1966-10-01), Barr
patent: 3353129 (1967-11-01), Leibinger
patent: 4176334 (1979-11-01), Buritz et al.
patent: 4333900 (1982-06-01), Carey

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