Electrical insulators having increased resistance to partial discharges
US4157975A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1976 |
| Grant date | Jun 12, 1979 |
| Priority date | — |
| Expiry date | Jun 17, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B3/441
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to electrical insulators having increased resistance to partial discharges and electrical equipment comprising such electrical insulators. These electrical insulators are formed of a macromolecular material in which is incorporated a chelate of general formula: ##STR1## wherein: R.sub.1, R.sub.2 and R.sub.3 each represent hydrogen or a alkyl, aryl, or cycloalkyl group or a heterocyclic group containing a sulphur, oxygen or nitrogen atom, whereby said group or heterocyclic group may be substituted by one or more halogen atoms; PA1 X and Y represent oxygen or sulphur; PA1 The total number of carbon atoms in the metal chelate is between 5 and 25; PA1 M.sup.n+ stands for a metal ion, and PA1 N is an integer from 1 to 4, this enolate or thioenolate being present in said insulating material in a sufficient amount for promoting extinction of partial discharges, said amount not exceeding a value which would substantially alter the physical properties of the insulator, such as its volume resistivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.