Surge arrester
US4476513A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1981 |
| Grant date | Oct 9, 1984 |
| Priority date | — |
| Expiry date | Dec 16, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C7/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A surge arrester comprises two or more surge arrester units which are electrically series-connected between a top terminal and a bottom terminal. Each surge arrester unit comprises a stack of metal oxide varistor blocks, the latter being distributed within the surge arrester so that the number of varistor blocks per unit length in the surge arrester unit which is nearest the bottom terminal is less than in the surge arrester unit which is nearest the top terminal. This enables a more even temperature distribution to be achieved throughout the length of the surge arrester especially in the case where the surge arrester is located where it is subjected to long-term external fouling or pollution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.