Patent · US Expired

Protective circuit for zinc oxide varistors

US4259704A · kind A · utility

9Cited by
6References
7Claims
0Family size

Assignee

Inventor

Key dates

Filing dateApr 20, 1979
Grant dateMar 31, 1981
Priority date
Expiry dateApr 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.