High-voltage bushing with layers of preshrunk embossed insulatin

Details High-voltage bushing with layers of preshrunk embossed insulatin High-voltage bushing with layers of preshrunk embossed insulatin

1980-12-30

1982-12-07

Askin, Laramie E.

Electricity: conductors and insulators

With fluids or vacuum

Insulators

174143, 264342R, 361315, 361323, 361326, H01B 1728, H01G 422, H01G 432

Patent

active

043628974

ABSTRACT:
A high voltage insulator bushing is formed of wound insulating foils and is provided with conductive parts which are at different electric potentials and with a wound insulator body arranged between the conductive parts. The wound insulator body contains layers of an embossed insulating foil which consists of a plastic material which shrinks above a predetermined temperature. The embossed insulating foil is subjected to a thermal shrinking treatment prior to being wound as part of the insulator body. Such preshrinking prevents further shrinkage which would occur when the high voltage bushing is operated. Smooth insulating foil may be wound as part of the insulator body so as to be interposed between the layers of the embossed insulating foil. The gaps and voids which are formed between the layers of insulating foils caused by the irregular surface of the embossed insulating foil are filled with an insulating medium.

REFERENCES:
patent: 3430116 (1969-02-01), Johnstone
patent: 3462545 (1969-08-01), Grimmer
patent: 3991451 (1976-11-01), Maruyama et al.
Brand, U., et al., "Gas Impregnated Plastic Foils for High Voltage Insulation", CIGRE Paper No. 15-02, 1972, 8 pp.
Boening, P., Kleines Lehrbuch der Elektrischen Festigkeit, Karlsruhe, 1955, pp. 140-142. _
Dietz, H., et al., "A Condenser Bushing with SF.sub.6 -Impregnated Plastic film Insulation", Third International Symposium on High Voltage _Engineering, Milan, Italy, Aug. 28-31, 1979, Report No. 32.09.

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