Abstract
According to two typical COT bushing faults, three typical 220kV cable-conductor bushings (COT, TOM and BRDLW) widely used in the power grid are analyzed about bushing compact structure. Bushing pressing structure, installation clamping force, deformation deviation and sealing system are discussed in the paper. The study found that the installation clamping force and the reeds adjustment range of COT bushing is smaller than others. The manufacturability deviation and the poor condition will cause hidden trouble to the bushing sealing system. Last, several suggestions about bushing maintenance are given for the COT bushing.
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