电晕放电对SF6绝缘直流穿墙套管合成电场的影响

doi:10.3969/j.issn.1008-0198.2025.05.009

湖南电力 ›› 2025, Vol. 45 ›› Issue (5): 64-70.doi: 10.3969/j.issn.1008-0198.2025.05.009

电晕放电对SF₆绝缘直流穿墙套管合成电场的影响

刘泰蔚¹, 谢雄杰¹, 胡伟¹, 蔡广燚¹, 许佐明¹, 白正², 尹朋博¹

1.中国电力科学研究院有限公司电网环境保护全国重点实验室, 湖北武汉 430074;
2.电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室, 清华大学, 北京 100084

收稿日期:2025-08-11 发布日期:2025-11-11
通信作者: 刘泰蔚(1994),男,工程师,主要从事高端套管智能故障诊断及智能监测工作。
基金资助:
国家电网有限公司科技项目（5500-202255120A-1-1-ZN）

Impact of Corona Discharge on Total Electric Field in the SF₆ Insulated DC Wall Bushing

LIU Taiwei¹, XIE Xiongjie¹, HU Wei¹, CAI Guangyi¹, XU Zuoming¹, BAI Zheng², YIN Pengbo¹

1. State Key Laboratory of Power Grid Environmental Protection, China Electric Power Research Institute, Wuhan 430074, China;
2. State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

Received:2025-08-11 Published:2025-11-11

摘要/Abstract

摘要： 高压直流穿墙套管合成电场在有电晕放电时会发生显著变化。对此,以工程应用的±100 kV SF₆气体绝缘直流穿墙套管为研究对象,采用场磨式静电探头法,测量直流穿墙套管在+90 kV直流电压极化和结束加压后去极化过程中的合成电场。通过在套管安装法兰附近布置接地尖端诱发电晕放电,分析不同尖端长度对直流穿墙套管合成电场的影响。结果表明：正常工况下随着极化时间的增加,直流穿墙套管合成电场先快速下降,之后趋于平缓,并在7 200 s后达到稳定状态,这是因为套管表面积累了异极性空间电荷;在去极化过程中,合成电场呈现近似指数衰减过程,其时间常数约为3×10⁴ s;随着尖端长度的增加,电晕放电呈现由放电量小、放电次数多到放电量大、放电次数少的变化过程,导致直流穿墙套管合成电场下降速率加快且稳定值降低。研究为探明直流穿墙套管复合外套表面电荷分布规律提供了数据支撑。

关键词: 高压直流, 穿墙套管, SF₆气体绝缘, 电晕放电, 合成电场

Abstract: The total electric field in HVDC wall bushing undergoes significant changes under corona discharge conditions. Therefore, an engineering-applied ±100 kV SF₆ gas-insulated DC wall bushing is selected as the study object. Using a field mill-type electrostatic field meter, the total electric field during both polarization under +90 kV DC voltage and subsequent depolarization after voltage removal are measured. The grounding tips are installed near the HVDC wall bushing flange to induce corona discharge, and the influence of tip lengths on the total electric field is analyzed. The results show that under normal conditions, the total electric field decreases rapidly initially and then stabilizes after 7200s with increasing polarization time, due to the accumulation of space charges on the surface. During depolarization, the total electric field decays approximately exponentially with a time constant of about 3×10⁴ s. As the tip length increases, the corona discharge transitions from smaller discharge magnitudes with higher frequencies to larger magnitudes with lower frequencies, resulting in a faster decrease rate and a lower stabilized value of the total electric field in the HVDC wall bushing. This study provides data support for elucidating the space charge distribution pattern on surface of HVDC wall bushings.

Key words: HVDC, wall bushing, SF₆ gas insulated, corona discharge, total electric field

中图分类号:

TM851

刘泰蔚, 谢雄杰, 胡伟, 蔡广燚, 许佐明, 白正, 尹朋博. 电晕放电对SF₆绝缘直流穿墙套管合成电场的影响[J]. 湖南电力, 2025, 45(5): 64-70.

LIU Taiwei, XIE Xiongjie, HU Wei, CAI Guangyi, XU Zuoming, BAI Zheng, YIN Pengbo. Impact of Corona Discharge on Total Electric Field in the SF₆ Insulated DC Wall Bushing[J]. Hunan Electric Power, 2025, 45(5): 64-70.

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电晕放电对SF₆绝缘直流穿墙套管合成电场的影响

Impact of Corona Discharge on Total Electric Field in the SF₆ Insulated DC Wall Bushing

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