邻近直流导线时交流电晕电流脉冲特性试验

发布时间：2018-05-02 16:17

本文选题：交流电晕放电 + 电晕电流脉冲　；参考：《电工技术学报》2017年04期

【摘要】：本文搭建交直流并行线路电晕放电试验平台,研究邻近直流电压时交流单点电晕放电下的电晕电流脉冲特性。并对交流电晕电流脉冲的分布模式、重复频率以及波形等特征参数进行统计分析。试验结果表明,邻近的正极性直流电压会促进交流负半周电晕放电而抑制交流正半周电晕放电,邻近的负极性直流电压作用正好相反。直流电压对交流负半周电晕电流脉冲波形参数无明显影响,而正半周电晕电流脉冲的幅值会随负极性直流电压的增加有所升高。同时发现,随着交流电压幅值的升高,促使其正半周发生电晕放电所需要的负极性直流电压幅值也相应地升高,并基于电晕放电的发展过程中电离强度的计算提出种子电子的缺失是造成该现象的原因。最后,在电晕放电离子云模型基础上,提出脉冲序列发展的过程中电离区域电场强度恒定不变的假设,从而对邻近直流电压影响下的交流电晕电流脉冲波形参数特性给出了合理的解释。
[Abstract]:In this paper, an AC-DC parallel circuit corona discharge test platform is set up to study the characteristics of corona current pulse under AC single point corona discharge near DC voltage. The characteristic parameters of AC corona current pulse, such as distribution mode, repetition rate and waveform, are analyzed statistically. The experimental results show that the adjacent positive DC voltage can promote the AC negative half-cycle corona discharge and suppress the AC positive half-cycle corona discharge. The DC voltage has no obvious effect on the waveform parameters of the AC negative half-cycle corona current pulse, but the amplitude of the positive half-cycle corona current pulse will increase with the increase of the negative DC voltage. At the same time, it is found that with the increase of AC voltage amplitude, the negative DC voltage amplitude required for positive half-cycle corona discharge also increases correspondingly. Based on the calculation of ionization intensity during the development of corona discharge, it is suggested that the absence of seed electrons is the cause of this phenomenon. Finally, on the basis of the corona discharge ion cloud model, the assumption that the electric field intensity in the ionization region is constant during the development of the pulse sequence is proposed. The parameter characteristics of AC corona current pulse under the influence of adjacent DC voltage are explained reasonably.
【作者单位】：新能源与电力系统国家重点实验室(华北电力大学);
【基金】：国家自然科学基金(51177041) 高等学校学科创新引智计划(“111”计划)(B08013)资助项目
【分类号】：TM75

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