500kV绝缘子串含零值绝缘子时的电晕放电分析

Analysis of Corona Discharge in 500kV Insulator String with Zero Insulators

由于绝缘子串中含有零值绝缘子可能会导致输电线路雷击跳闸事故,本文基于有限元法研究了绝缘子串中含零值绝缘子的电场分布,并结合紫外检测仪观测电晕放电综合研究绝缘子串的电晕放电情况。建立了绝缘子串的三维模型,考虑了绝缘串子中含有零值绝缘子时的情况,并对该模型进行了电场仿真,同时通过紫外检测技术观测了含零值绝缘子的绝缘子串电晕放电,而且电场分析结果与实测数据相符,零值绝缘子附近电场发生畸变,紫外观测数据显示零值绝缘子附近发生了电晕放电。零值绝缘子导致的电场畸变是零值绝缘子附近发生电晕放电的重要原因之一,该研究可用于高压输变电设备外绝缘状况紫外检测的诊断与评估。

Insulator string containing zero value insulator may result in lightning trip-out accidents of transmission lines. Based on finite element method, the electric field distribution of insulator strings containing zero value insulator is studied. With the corona discharge data observed by the UV detector, corona discharge of the insulator string is also studied. With 3D model of the insulator string built and the insulator string with zero value insulator considered, the electric field distribution of the model is simulated. The corona discharge of the insulator string with zero value insulator has been observed using UV detection. The electric field analysis result agrees with the measured data, where the electric field near the zero value insulator is distorted and the corona discharge observed by ultraviolet detector occurs near the zero value insulator. Therefore, field distortion caused by zero value insulator is one of the important reasons for corona discharge near zero value insulator. The result can be used for external insulation diagnosis and assessment of high voltage power transmission equipment with UV detection.