绝缘护套在变电站500 kV引线中应用的可行性分析

Application Feasibility Analysis on Insulation Sheath in Substation 500 kV Lead

对某500 kV变电站部分500 kV引线段存在保护死区问题进行分析,提出对引线加装绝缘护套的绝缘化改造方案,分析加装绝缘护套对空间电场的影响,等效电气间隙的变化,以及护套材料的电气性能、热性能是否满足改造要求,给出优化改造建议。

Aiming at the problem of protection dead zone for some 500 kV lead segments in the 500 kV substation,the cause is analyzed,the lead transformation insulation sheath insulation is proposed,and then the influence of the insulation sheath on the spatial electric field is analyzed,the change of the gap before and after the transformation is compared.Whether the electrical and thermal properties of the sheath material can meet the requirement of lead insulation transformation,the optimization and transformation plan is given through the comprehensive analysis.