Beam strengthened cutout insulator

Details Beam strengthened cutout insulator Beam strengthened cutout insulator

H - Electricity

01

B

337/123

H01B 17/06 (2006.01)

Patent

CA 1309150

BEAM STRENGTHENED CUTOUT INSULATOR Abstract of the Disclosure An improved, integrally cast, synthetic resin insulator (22) especially adapted for use in an electrical cutout device (20) is provided which can be readily fabricated and gives greatly en- hanced beam strength and arc track resistance characteristics. The preferred insulator (22) is cast using an epoxy resin such as bisphenol A filled with a relatively large quantity of glass beads and hydrated alumina. The filler fraction contributes to lowered viscosity, deaerability and improved settling properties while the resin is in an uncured state, and moreover enhances the arc track resistance and mechanical strength of the resin system after curing. The preferred insula- tor (22) is cast to present a longitudinal bow giving the insulator (22) an arcuate central axis. Further, the periphery of the insulator (22) is formed with a series of superposed, generally oval-shaped in cross-section, outwardly flaring skirts (30) interconnected by smooth transition regions (32) free of stress-inducing sharp cor- ners. By virtue of the oval-shaped skirts (32), the insulator (22) has a greater effective width than thickness, thus maximizing the beam strength of the insulator (22).

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