Surge protection device

Details Surge protection device Surge protection device

H - Electricity

02

H

317/13, 317/12.4

H02H 9/04 (2006.01)

Patent

CA 1288463

Abstract of the Disclosure A surge protection device (10) for protecting an electric power system from excessive voltage surges, including those caused by direct lightning strikes. Metal oxide varistors (14, 16 and 18) are wired between each incoming 115 volt power line and ground and between the two power lines (24 and 26). The varistors connect with the power lines on the user side of the main circuit breakers (30). The varistors (14, 16 and 18) are normally nononductive but become conductive when excessive voltages are present on the power lines 24 and 26). Then, short circuits are established through the varistors (14, 16 and 18) to protect downline equipment. The varistors (14, 16 and 18) are embedded in a pliable filler material (62) which fills a rigid polymeric shell (12). In the event of a direct lightning strike, the surge protector (10) is destroyed sacrificially and the pressure resulting from the failure is relieved through the opposite ends (20 and 22) of the shell.

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