Surge absorbing device

Details Surge absorbing device Surge absorbing device

1985-06-28

1987-04-14

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

361111, H02H 904

Patent

active

046583246

ABSTRACT:
A surge absorbing device of composite construction comprising a high resistance element of metal oxide and a pair of electrodes connected to the high resistance element with a discharging gap formed between the electrodes. At a normal state, a fine current flows through the high resistance element, but when a surge voltage is transiently applied across the high resistance element, a triggering discharge is produced across the electrodes by a voltage drop of the product of the resistance value of the high resistance element and the value of surge current whereby it is immediately transferred to a main discharge of large current to absorb the surge current at a high velocity. A heat-proof and reduction-proof protective film is formed on the surface of the high resistance element to stabilize the characteristic of surge absorption. The protective film may be formed of a carbide of a carbon group element, of lead borosilicate glass or deleaded glass, or of a multi-layer of lead borosilicate glass or deleaded glass and metal oxide.

REFERENCES:
patent: 3876894 (1975-04-01), Peche
patent: 3889222 (1975-06-01), Takano et al.
patent: 3961225 (1976-06-01), Tachibana et al.
patent: 4233641 (1980-11-01), Baumbach
patent: 4237515 (1980-12-01), Pierce, Jr.

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