正负直流电压下棒板间隙起晕电压计算方法

Calculation Method for Corona Onset Voltage of Rod Plane Gaps Under Positive and Negative DC Voltage

阐述了棒-板间隙正电晕起晕判据的推导过程,并采用正负电晕起始判据分别建立了计算棒-板间隙正负直流起晕电压的光电离模型,且确定了模型中碰撞电离系数、吸附系数、光子吸收系数、光子表面发射系数等参数的取值。进行了10 cm、12 cm、14 cm和16 cm间隙距离下的棒-板间隙正负直流电晕放电试验,通过紫外成像仪和高电位电流采集系统得到了正负直流起晕电压特性,起晕电压计算结果与紫外法检测结果对比,相对误差在-0.8%~5.6%,与高电位电流法检测结果对比,相对误差在-1.8%~2.5%,计算结果与试验结果吻合度较好。提出的正负直流电晕计算模型对加强特高压输电工程中的电晕控制具有指导意义和重要参考价值。

We first expounded the derivation process of positive corona criterion for rod-plate gap in detail,and established a photoionization model for calculating the positive and negative DC corona onset voltage of rod-plate gap by using positive and negative corona criterion.Values of collision ionization attachment coefficients,photon absorption coefficient,emission coefficient of photon surface and other parameters in the model are determined.The positive and negative DC corona discharge test of the rod-plane gaps at 10cm,12cm,14cm and 16cm was carried out.The positive and negative DC onset voltage characteristics under different gap distances were obtained by the UV imager and the high potential current acquisition system.The calculated results were compared with the results of UV detection.The relative error is-0.8%~5.6%.Compared with the high potential current method,the relative error is-1.8%~2.5%.The calculated results agree well with the experimental results.The proposed calculation model for positive and negative DC corona onset voltage has guiding significance and important reference value for enhancing corona control in UHV transmission engineering.