【作者】 何旺龄； 何俊佳； 熊蕊；

【Author】 HE Wang-ling;HE Jun-jia;XIONG Rui;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology;

【机构】 华中科技大学电气与电子工程学院；

【摘要】 随着我国特高压的发展和输电线路电压等级的大幅度提高,输电线路的电晕效应问题愈加明显,而电晕效应产生的本质原因是导线表面过高的电场强度引起的电晕放电问题。因此,利用小电晕笼,对交流施加电压条件下的电晕脉冲放电特性和无线电干扰特性进行了试验研究。主要利用高频电晕电流采集系统对交流电晕放电脉冲进行了采集分析,讨论了不同施加电压条件下,交流正、负半轴的电晕脉冲幅值和脉冲重复率的变化规律,同时利用高压耦合电容和无线电干扰接收机对电晕放电脉冲引起的无线电干扰水平进行了测量研究。得出结论:随着施加电压的增大,交流正负半轴的电流脉冲幅值变化很小,而脉冲个数增量很大;相比正极性电晕脉冲,负极性电晕脉冲更加的规则;同时,线路无线电干扰水平随施加电压的增大而增大,随测量频率的增大而减小。更多还原

【Abstract】 With the development of ultra-high voltage(UHV) AC transmission systems and the increase of voltage level,some undesired corona effects become more obvious,which mainly caused by the corona discharge phenomenon.In this paper,the alternating current(AC) corona discharge performance is studied by using a small corona cage with different applied AC voltages,where the corona cage is located in a 5m anechoic chamber to avoid the outside interference.The different corona models are detected in an AC cycle with a high-speed current acquisition system.And the characteristic parameters of AC corona pulses,such as average amplitude and repetition frequency,are statistically analyzed.Besides,the frequency responses of corona current pulses are investigated.It is found that a higher applied voltage can lead to an obvious increase of the pulse number in a cycle but little change in average pulse amplitude.The negative Trichel pulse is more consistent with this characteristic.Besides,the frequency responses of corona pulses increase with the applied voltage rise,and decreases with the frequency rise.更多还原