Bushing compsite insulator

IEEE Standards C57.19.00;1991 & C57.19.01;2000 ISO 9001;2008 Composite bushings have been designed for application on oil filled transformers and reactors and meet or exceed the applicable requirements of IEEE Standards C57.19.00;1991 and C57.19.01;2000. The design offers a capacitively graded, oil free, dry polymer condenser bushing with a composite air end insulator and silicone rubber weathersheds for outdoor applications. The condenser consists of an electrical grade paper wound over a central winding tube. The condenser deign is achieved by inserting aluminum foil layers at predetermined locations for distribution of stresses. The condenser core is then heat and vacuum dried and subsequently impregnated with an electrical grade epoxy. The cured resin paper condenser core has the electrical, mechanical, and thermal properties that make it suitable for application in oil filled transformer and reactors. The air end insulator consists of a filament-wound glass fiber reinforced composite insulating tube with silicone rubber weathersheds for outdoor application. The lower end of the composite insulating tube is attached to an aluminum-mounting flange. The upper end of the tube is attached to an aluminum cap that enables the assembly of the bushing. The insulator is assembled over the upper part of the condenser in such a way that it makes a seal with the condenser in the mounting flange area as well as at the upper end. The insulator assembly with the mounting flange provides the bushing with mechanical strength as well as means to mount the bushing on the apparatus. The double, oil resistant O-ring seals at the top and bottom ends along with the composite insulator make the bushing design virtually impervious to moisture from the outside. Both the mounting flange and the upper cap are made of corrosion resistant aluminum. The space between the condenser core and the composite insulator is filled with a specially formulated nontar polymer compound, which after curing results in a hard rubber like consistency. This filler maintains its rubberlike consistency at temperatures typically encountered in oil filled transformer and reactor applications. The lower end of the resin impregnated condenser core is exposed to transformer oil. Since there is no liquid filler, the bushing is dry in nature and therefore not susceptible to any leaks or fire hazards and can be applied at any angle from vertical to horizontal. The composite silicone insulator is designed to meet or exceed the heavy contamination creep distance requirements of the IEEE Standards C57.19.01;2000 and C57.19.100;1995. The use of non-ceramic composite insulator with silicone rubber weathersheds offers unique features that make this design more suitable for areas with contamination and seismic activity. In the absence of porcelains, the bushing is lighter, easier to handle and install. It is less susceptible to damage from vandalism, shipping, and handling. Because of these unique features, it is virtually maintenance free and its use will result in a cost effective product on an overall basis.

Bushing compsite insulator