Protective circuit for zinc oxide varistors
US4174529A · kind A · utility
11Cited by
5References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 10, 1978 |
| Grant date | Nov 13, 1979 |
| Priority date | — |
| Expiry date | Apr 10, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention provides a circuit for determining excessive energy magnitudes or rates of rise of energy in metal oxide varistor devices. The circuit further provides a series of low voltage control pulses for energizing a high voltage pulse generator. The output of the high voltage pulse generator triggers 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.