Abstract:This article mainly introduced the guizhou power grid companies high-voltage switchgear running in high humidity area, internalinsulationof switchgear failure easily, lead to damage of switchgear, greatly influence the safe and stable operation of power grids. Beginning in 2015 for special projects switchgear insulation accident nt, through special accident investigation, greater scope for switchgear partial discharge test and typical substation switchgear work and so on, The reasons for insulation failure of 10kV and 35kV switchgear were found, and corresponding measures were taken to rectify them.In accordance with the geographical features of the cold and humidity in guizhou, guizhou power grid company is compiled according to the research results switchgear specification book, improved the switchgear insulation requirements, puts forward the switchgear essence safety point of view, the essence of the lifting equipment safety from the source is the first condition of ensuring the safe operation of the equipment.Switch cabinet of stock a complete set of control measures, through the governance and rectification, guizhou power grid companies switchgear insulation fault has fallen sharply, the switchgear insulation reform has achieved good results and experience.