Fail-safe surge arrester

Details Fail-safe surge arrester Fail-safe surge arrester

H - Electricity

01

C

317/13, 317/24

H01C 8/04 (2006.01) H01C 7/12 (2006.01) H01T 1/15 (2006.01)

Patent

CA 2012253

A fail-safe, non-fragmenting surge arrester includes a liner having outlets formed in the walls thereof for venting ionized gases generated within the liner by internal arcing. The vented ionized gas forms a lower impedance path for the current which is thereby shunted around the failed internal components, preventing the generation of internal pressure which could otherwise cause a fragmenting failure mode of the arrester. The internal components include stacked varistor elements and may include an internal fuse link electrically in series with the varistors.

Dispositif de protection contre les surtensions sans fragmentation et à sécurité intégrée incorporant une chemise conductrice comportant des orifices de sortie pour l'évacuation des gaz ionisés produits à l'intérieur de la chemise par la formation d'arcs électriques. Les gaz évacués offrent un trajet de plus faible impédance pour le courant qui est alors détourné des composants internes défectueux, prévenant ainsi la production d'une pression interne qui autrement aurait pour effet de mettre le dispositif de protection contre les surtensions en mode de fragmentation. Les composants internes incluent des varistances empilées et peuvent inclure un lien fusible interne monté en série avec les varistances.

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