Electrostatic shield for a transformer

Details Electrostatic shield for a transformer Electrostatic shield for a transformer

1981-10-30

1983-04-12

Kozma, Thomas J.

Inductor devices

With electric and/or magnetic shielding means

174 35CE, H01F 1504

Patent

active

043799990

ABSTRACT:
An electrostatic shield for an electrical transformer comprises a substantially ring-shaped inner insulator of asymmetric vertical cross-section with a side confronting a coil of the transformer being substantially planar and the remaining surface being of a curved section, a field concentration relaxation conductor formed from a conductive foil, completely surrounding the inner insulator, and a multiple outer insulator comprising at least one layer of polyethylene terephthalate (PET) film and at least one mica insulation layer with mica bonded to a non-conductive backing film such as glass tape or PET film by a bonding agent such as epoxy resin, whereby the dielectric strength of the electrostatic shield and hence the transformer, is substantially improved.

REFERENCES:
patent: 3602858 (1971-08-01), Moone et al.
patent: 4153891 (1979-05-01), McNutt
Report by Mitsubishi Denki Corporation entitled "Applications and Circumstances of Gas-Insulated Transformers," vol. 54, No. 8, 1980 and an English translation thereof.

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