500kV无间隙MOA电位分布分析及其均压化措施

采用静电场数值计算的模拟电荷法 (CSM)和电路分析中的节点电压方程法对 50 0 k V无间隙 MOA阀片承担的电压进行了分析。分析结果表明 ,上节元件两端和下节元件靠近地端的阀片承担较大的电压 ,这与该 MOA解剖结果一致。为改善此 MOA阀片承担电压的均匀性 ,对可能采用的几种措施用此种分析方法进行了仿真研究。并提出了“场 -路”结合思想 ,电场计算部分不仅可采用 CSM,也可采用有限元法 (FEM)、有限差分法 (FDM)等其它数学方法。本方法也为三维场转化为轴对称场或平行平面场提供了一种有效的途径。

Analysis on Electric Stress along 500kV Gapless MOA and Its Evening Measurement

The electric stress along 500kV gapless MOA′s double resistor columns is analyzed with charge simulation method (CSM) and the node voltage equation method. The results shows that higher potential stress occures on resistors at both ends of the upper element and the earth end of the lower element, which is in agreement with the MOA′s diagnosis test results. In order to even the resistor stress, some possible measurement are simulated. The ′field unites with circuit′ method suggested in this paper can adopt the method as Finite Element Method, Finite Difference method as well as CSM and so on. This method also proved an efficient avenue from three dimensions field to axle balanced field or parallel field.