Self-compressive surge arrester module and method of making...

H - Electricity – 01 – C

Patent

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Details

H01C 7/12 (2006.01) H01C 7/10 (2006.01) H01C 17/00 (2006.01) H02H 9/04 (2006.01)

Patent

CA 2247928

A surge arrester module having an array of MOV's and other components includes an insulative coating (16) for applying an axially compressive force to the stacked array. The component stack (20), while held in an axially compressed condition, receives the insulative casing that includes thermosetting resin that, when cured, has a coefficient of thermal expansion that is greater than that of the components of the stack. The coated stack is then cured at a temperature that exceeds the maximum expected temperature that will be experienced by the arrester components. Upon cooling, the components of the array are held in compression and adequate electrical contact with each other is maintained by the casing. Fiberglass strands (24, 28) are included in the casing for reinforcement and cantilever strength. A method of manufacturing the module is also disclosed.

Cette invention concerne un module de protection contre les surtensions qui possède un réseau de varistors à oxyde métallique, ainsi que d'autres composants. Ce module possède un revêtement isolant (16) permettant d'exercer une force de compression axiale sur le réseau empilé. Lorsqu'elle est maintenue en situation de compression axiale, la pile de composants (20) va recevoir un boîtier isolant comprenant une résine thermodurcissable qui, une fois solidifiée, possède un coefficient de dilatation thermique supérieur à celui des composants de la pile. La pile ainsi enduite est ensuite solidifiée à une température supérieure à celle que les composants du module de protection pourront avoir à supporter. Lors du refroidissement, les composants du réseau sont maintenus en compression tandis que le boîtier permet de maintenir un contact électrique adéquat avec chacun d'entre eux. Des brins de fibre de verre (24, 28) sont intégrés aux boîtier de manière à renforcer le module et à obtenir une plus grande résistance en porte-à-faux. Cette invention concerne également un procédé de fabrication de ce module.

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