Multilayered high voltage grading system for electrical conducto

Details Multilayered high voltage grading system for electrical conducto Multilayered high voltage grading system for electrical conducto

1978-11-14

1980-06-10

Dixon, Jr., William R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310196, 428331, 428446, H02K 1512

Patent

active

042074827

ABSTRACT:
An insulated electrical member is made, having in combination, an electrical member covered with insulation and a conducting varnish, where an abrasion resistant stress grading system covers at least part of the conducting varnish, the stress grading comprising: (1) a first base layer of resinous paint containing non-linear SiC having a resistivity value of between 2,000 to 4,000 Meg. Ohm/Square, in contact with the conducting varnish, (2) a second overlapping layer of resinous paint containing non-linear SiC having a resistivity value of between 4,000 to 6,000 Meg. Ohm/Square and containing at least one fibrous support, covering the first base layer and (3) an overcoat of an arc and track resistant resinous insulating varnish; where, at the point of overlap of the SiC layers, the thickness ratio of the base SiC layer:overlapping SiC layer is from 1:1 to 1:15.

REFERENCES:
patent: 2318074 (1943-05-01), Hill et al.
patent: 3210461 (1965-10-01), Berg et al.
patent: 3354331 (1967-11-01), Broeker et al.
patent: 3364066 (1968-01-01), Karlson et al.
patent: 3505729 (1970-04-01), Balke et al.
patent: 3670192 (1972-06-01), Andersson et al.
patent: 3823334 (1974-07-01), Philofsky et al.
patent: 3824683 (1974-07-01), Rhudy
Hirabayashi et al., "A New Corona Suppression Method for High Voltage Generator Insulation", Proceeding of the 12th Electrical/Electronics Insulation Conference, 1975, pp. 139-142.

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