Surge voltage arrester with fail-safe feature

Details Surge voltage arrester with fail-safe feature Surge voltage arrester with fail-safe feature

1979-03-07

1981-02-03

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

337 28, 337 32, 337 33, 338 21, 361127, 361 57, H02H 322, H02H 904

Patent

active

042492246

ABSTRACT:
A surge voltage arrester utilizes for surge protection a varistor of the zinc oxide type between a line terminal and a ground terminal. The varistor is of a type that has a resistance which decreases as increasing voltage is applied thereacross. With increasing temperature the leakage current through the varistor increases at a given voltage. At a critical temperature and voltage condition, the varistor is subject to a thermal runaway condition which would cause the varistor to fail expelling hot particles. To avoid this failure condition, a fail-safe mechanism is provided which connects the line terminal to the ground terminal by-passing the varistor when there is an overcurrent condition on the line that results in heating of the varistor.

REFERENCES:
patent: 3755715 (1973-08-01), Klayum et al.
patent: 3879696 (1975-04-01), Imajyo et al.
patent: 3946429 (1976-03-01), Kessler, Jr.
patent: 3975664 (1976-08-01), Baumbach
patent: 4002952 (1977-01-01), Menninga
patent: 4015228 (1977-03-01), Eda et al.
patent: 4068281 (1978-01-01), Harnden, Jr.
patent: 4168514 (1979-09-01), Howell

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