Patent · US Expired

Surge arrester

US4352140A · kind A · utility

16Cited by

2References

8Claims

0Family size

Assignee

Asea Aktiebolag · SE

Inventors

Bror Axelsson · Binstead Close, SE
Ulf Johnsen · Ludvika, SE
Lennart Stenstrom · Ludvika, SE
Bengt Thors · Ludvika, SE

Key dates

Filing date	Apr 24, 1981
Grant date	Sep 28, 1982
Priority date	—
Expiry date	Apr 24, 2001

Classification

Technology area (CPC H)Electricity
CPC primaryH01C7/12
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In a surge arrester comprising a stack of series-connected cylindrical ZnO-varistors in an insulating housing, the envelope surface of each varistor is provided with an insulating protection means, which overlap varistors positioned adjacent to each other. The protection means prevent the varistors from being mechanically damaged during handling, provides guiding for the varistors in the stack, and seals the stack of varistors, so that a local glow discharge or a fault in individual varistors will not lead to an arc flash-over along the stack.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.