Non-fragmenting arrester with staged pressure relief mechanism

Details Non-fragmenting arrester with staged pressure relief mechanism Non-fragmenting arrester with staged pressure relief mechanism

H - Electricity

02

H

317/17

H02H 3/22 (2006.01) H02H 1/04 (2006.01) H02H 3/20 (2006.01)

Patent

CA 2030740

ABSTRACT A non-fragmenting surge arrester with a staged pressure relief mechanism includes a liner with outlets formed in the walls thereof, a gas expansion chamber within the liner and a housing having weakened-wall regions adjacent to the outlets in the liner. Ionized gas formed by an internal failure is vented from the expansion chamber through the outlets and, upon generation of sufficient pressure, fractures the housing at the weakened-wall regions. In this manner, the generated gas forms a lower impedance path for the current which is thereby shunted around the failed internal components, preventing the generation of further internal pressure which could cause a catastrophic failure of the arrester. 2415b/1

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