Hazard Analysis of Residual Section in Glass Insulator Strings of 35 kV Transmission Lines
Aiming at the residual section of 35 kV transmission line glass insulator after zero value self-explosion,the external insulation and internal insulation characteristics of the residual section are analyzed.Combined with two examples,the damage of the residual section in the glass insulator string of 35 kV transmission line under the action of strong wind and heavy rain is analyzed,and the countermeasures are put forward for the damage of the residual section.The results show that rainwater can be infiltrated into the internal insulation through the external insulation of the residual section;If the residual section is not found and replaced in time during operation,heavy wind and rain may cause single-phase ground flashover fault of 35 kV transmission line glass insulator string with residual section.Among them,before the internal insulation of the residual section is not infiltrated by rainwater,the internal insulation level is higher than the external insulation level,and the flashover arc is directly pulled from the external insulation of the residual section,which may cause the 35 kV transmission line with single-phase grounding flashover fault and delayed tripping to burn out the wire fault;After the internal insulation of the residual section is soaked by rainwater,the internal insulation level is lower than the external insulation level,and the flashover arc is conducted from the internal insulation of the residual section soaked by rainwater,which may cause the 35 kV transmission line drop string fault.
glass insulatorresidual sectionself-shatteringexternal insulationinternal insulation35 kV transmission line
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