Anti-overvoltage protector

Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation

Patent

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Details

361117, 313602, 313325, H02H 904, H01T 202

Patent

active

046283994

ABSTRACT:
A pair of main electrodes are hermetically mounted, by fusion of a low melting point metal, onto both end openings of an insulative cylindrical member, respectively. Main electric discharge surfaces of the electrodes oppose each other in said cylindrical member with a gap interposed therebetween. A recessed portion is provided in the main electric discharge surface of one of the pair of main electrodes. A pair of trigger electrodes are conductively connected to the pair of main electrodes, and oppose each other in the recessed portion to thereby form a trigger electric discharge gap therebetween. The pair of main electrodes are formed of electrically conductive material having a thermal coefficient of expansion greater than that of the insulative cylindrical member. The dimension of the trigger electric discharge gap is given as the dimension of the gap between the trigger electrodes which is produced due to the difference in the thermal coefficient of expansion between the pair of main electrodes and an insulative cylindrical member when the trigger electrodes are caused to contact each other by zeroing the gap therebetween and, in this state, the pair of main electrodes are hermetically mounted, by fusion of the low melting point metal, onto both end openings, respectively, of the insulative cylindrical member and, thereafter, the resultant unit is cooled down to room temperature.

REFERENCES:
patent: 3588576 (1971-06-01), Kawiecki
patent: 3989985 (1976-11-01), Lange et al.
patent: 4175277 (1979-11-01), Zuk

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