【摘要】 超、特高压避雷器电位分布的改善通常采用综合均压措施,即在高压端加均压环,同时在避雷器元件上并联均压电容柱。虽然均压电容柱能有效改善避雷器电压分布,但也带来了性能难以检验及参数选择不当会使避雷器运行可靠性下降等诸多不安全因素。通常均压柱中电容器电容比避雷器电阻片电容小很多,电容柱自身的电位分布比电阻片柱更不均匀,局部电容器的荷电率很高,会导致其加速老化,直至毁坏。文中采用有限元法建立1 000kV交流系统无间隙金属氧化物避雷器挂网运行时的三维仿真模型,在给定的均压环配置基础上,计算分析了均压电容柱的电位分布,得出电容值和电容器、垫片的排布对电容柱电位分布的影响显著,特别是避雷器元件两端靠近法兰的电容器承担的电压需要关注,必须合理选择电容器参数,为特高压避雷器均压电容器参数的合理选取提供参考依据。更多还原

【Abstract】 To improve the potential distribution of the EHV or UHV MOA usually requires a comprehensive measurethat the grading rings are taken in the high-voltage side,while grading capacitors are enforced on the arrester elements.Although the grading capacitors can improve voltage distribution of the arrester,it may be difficult to test and itsimproper parameters will bring insecurity. Since the capacitance of capacitor column is much smaller than that of MOVcolumn,the potential distribution is unevenly,and some capacitors’ electric load rate is very high,which will causesits accelerated aging until it is destroyed. This paper builds 3 D model of 1 000kV MOA capacitor column put inoperation by means of the finite element analysis method to get the conclusion that the capacitance and the configurationof the capacitors and gaskets make influence on the potential distribution of the capacitor column. In particular,thewithstand voltage of the capacitor at both ends of the arrester element near the flange needs to be concerned. Thereferenceisprovidedforthereasonableselectionoftheparametersofcapacitorcolumnfor 1000kVMOA.更多还原