Surge voltage arrester with fail-safe feature

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

H - Electricity

01

C

317/12.4

H01C 7/12 (2006.01) H01C 8/04 (2006.01) H02H 9/04 (2006.01)

Patent

CA 1137542

Baumbach Case 282 Abstract of the Disclosure A surge voltage arrester utilizes for surge protection a varistor (16) of the zinc oxide type between a line terminal (4, 40) and a ground terminal (6, 60). The varistor is of a type that has a resistance which de- creases 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 (34, 26, 30, 14 etc.) 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.

345938

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