Multilayered high voltage grading system for electrical conductors
US4207482A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1978 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Nov 14, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/259
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.