南充500kV变电站电晕放电成因分析及抑制措施

Causes Analysis and Suppression Measures of Corona Discharge in Nanchong 500 kV Substation

电晕是高压输变电设备上常见的放电现象,不仅会引起电能损耗和无线电通信干扰,还会产生臭氧和氮氧化物污染环境,为解决此一问题,结合南充500kV变电站某门型塔出现的电晕放电现象在COMSOLMultiphys-ics软件中建立了仿真模型;基于有限元法计算了电晕区域的电场分布,分析了电晕形成的原因,得出了屏蔽环选取时未考虑复杂的电气接线和导线排列等因素的影响以及各导体产生的电场相互叠加是导致该变电站出现电晕放电现象的主要原因的结论;提出了优化屏蔽环尺寸、改变接线方式和调整各相母线排列方式等措施以减轻或消除电晕放电。分析表明,与改变接线方式和调整各相母线排列方式相比,优化屏蔽环几何参数的措施简单易行且抑制电晕放电效果明显,是消除南充500kV变电站电晕放电现象的最佳方案,而改变接线方式和调整各相母线排列方式亦可为将来工程的设计提供参考依据。

In order to mitigate the serious corona discharges in Nanchong 500kV substation,we established a simulation model by the COMSOL Multiphysics software based on FEM to investigate the corona in the area,and believed that the serious discharge was caused from the facts that complex electrical wiring,wire arrangement and other factors were not taken into account when selecting shielding rings and the superposition of electric field generated by conductors around the door-type tower.Many countermeasures,such as to optimize geometric parameters of shield rings,to adjust the connection mode,and to change the phase sequence,were used to eliminate the serious corona discharges.It is revealed that optimizing geometric parameters of shield rings,and adjusting connection mode or changing phase sequence need to change the existing electric connection,which is hard to apply,but it can be used as reference for future project design.