一种特高压交流输电线路冲击电晕的改进模型  

Improved Model of Impulse Corona on Ultra High Voltage Alternating Current Transmission Lines

作　　者：文艺[1,2] 李淳 李建明 

机构地区：[1]西华大学电气信息学院,成都610039 [2]国网四川检修公司,成都610072 [3]国网四川雅安电力(集团)公司,四川雅安625000 [4]国网四川电科院,成都610072

出　　处：《高压电器》2015年第2期63-72,共10页High Voltage Apparatus

摘　　要：在变电站设备雷电绝缘裕度设计中,忽略输电线路上冲击电晕引起的雷电侵入波的衰减畸变,使得电气设备雷电绝缘裕度的要求过严,加之冲击电晕对特高压输电线路绕击耐雷水平计算值也有很大影响,这都让特高压输电线路上冲击电晕效应的研究显得很有必要。笔者提出了一种既考虑避雷线上电晕和起晕导线间耦合作用,又考虑输电线路与大地间电晕电容分布特点的多导线冲击电晕模型,该模型更符合冲击电晕放电的实际情况。同时,建立了计及上述电晕模型的特高压交流线路的雷电绕击仿真电路。结果表明,冲击电晕会对线路上的波过程产生影响,使雷电过电压波的幅值和陡度发生衰减和波形,从而提高了线路绕击耐雷水平的计算值。In the lightning insulation margin design of substation equipment, the attenuation and distortion of inbreaking lightning wave induced by impulse corona on transmission lines are ignored, leading to an over-strict requirement for the insulation margin. And the impulse corona exerts a significant influence on the withstand level calculation of hghtning shielding failure. Therefore, it is necessary to investigate the impulse corona effect on UHV transmission lines. In this paper, a multi-conductor impulse corona model is proposed by considering the corona effect of overhead ground wire, the coupling between the transmission lines with corona, and the distribution feature of the corona capacitance between transmission line and ground. This model is well in accordance with the actual impulse corona discharge. Moreover, a lightning shielding failure simulation circuit of UHVAC transmission lines with corona is constructed by using ATP-EMTP. Simulation resuhs show that impulse corona influences the wave process on the line to attenuate and distort the amplitude and steepness of lightning wave, so as to raise the withstand level of lightning shielding failure.

关 键 词：冲击电晕 特高压输电线路 绕击 ATP-EMTP 耐雷水平 衰减和变形 

分 类 号：TM863[电气工程—高电压与绝缘技术]