Insulating structures

Details Insulating structures Insulating structures

H - Electricity

01

B

H01B 17/42 (2006.01) H01B 17/50 (2006.01)

Patent

CA 2539371

An electrical insulator (10) comprises an elongate shank (12) and one or more sheds (14) disposed along the length of the shank (12). The surface of the insulator comprises longitudinally extending flutes, the depth of which are varied along the length of the insulator such that the circumferential distance of all transverse sections along the length of the insulator is substantially constant or controlled. Instead of flutes, the surface may be formed with an array of protuberances and/or concavities. The insulator thus provides a defined perimeter and surface area along its length, such that areas of the surface are not preferentially heated by surface currents to form dry bands and thereby cause arcing. Such topography also renders the insulator less susceptible to the degrading effects of surface pollution.

Isolant électrique (10) composé d'une tige allongée (12) et d'une ou de plusieurs collerettes (14) situées le long de cette tige (12). La surface de cet isolant comprend des cannelures longitudinales dont la profondeur varie le long de l'isolant, de sorte que la distance périphérique de la totalité des sections transversales de la longueur de l'isolant est pratiquement constante ou réglée. A la place des cannelures, cette surface peut comporter un ensemble de protubérances et/ou de formes concaves. Cet isolant présente, de ce fait, un périmètre et une surface définis sur sa longueur, de sorte que certaines zones de cette surface ne sont pas réchauffées de manière préférentielle par des courants superficiels, de manière à créer des bandes sèches susceptibles de provoquer un arc électrique. Cette topographie permet à l'isolant d'être moins exposé à la dégradation causée par la pollution de surface.

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