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Columninsulatorsaredividedintoeightlevelsof95,105,125,150,170,200,250and325KVaccordingtotheratedlightningimpulsewithstandvoltagevalue.AccordingtotheratedbendingfailureloadvalueFourlevelsof3,5,8and12.5KV.Accordingtoitsinstallationmethod,itisdividedintotwotypes:verticalinstallationandhorizontalinstallation.Accordingtoitsconnectionwithhigh-voltagewires,itisdividedintotopbindingtypeandtopclamptype.Kind.Accordingtotheconnectionbetweenthesteelfeetandthebase,itcanbedividedintotwotypes:separableandnon-separable.