Abstract
Compared with conventional porcelain bushings, polymeric ones are light and therefore possess improved seismic performance. They are also explosion proof with no scattering when broken and are highly stain resistant. In particular, the polymeric bushings coated with silicone rubber show good voltage resistance performance, even when covered with salt deposits. That is, by covering the surface with silicone rubber, the hydrophobic nature of the polymer bushing becomes excellent. This reduces the risk of the occurrence of surface arc discharges and flashovers. Therefore, as shown in Figure 1, the length of a typical polymer bushing insulated with pressurized SF6 can be reduced significantly compared with a conventional porcelain bushing insulated with oil-impregnated paper (OIP) of the same voltage class. The weight can be reduced drastically as well.
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