Protective circuit for zinc oxide varistors
US4259704A · kind A · utility
9Cited by
6References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1979 |
| Grant date | Mar 31, 1981 |
| Priority date | — |
| Expiry date | Apr 20, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/043
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention provides an improved circuit for determining rates of rise of energy in metal oxide varistor devices. A high voltage transformer is employed to trigger a protective air gap for bypassing the metal oxide varistor device. One application for the invention is for use within a series capacitor protective circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.