摘要
直流电晕放电产生的空间电荷会在恒定的直流电场作用下积聚到设备绝缘表面上,引起绝缘子表面局部电场畸变,加速绝缘子老化,降低绝缘性能。因此研究绝缘子表面电荷的消散特性对高压直流电气设备的绝缘优化设计非常重要。基于绝缘材料表面电荷消散的基本理论,考虑3种典型的电荷消散方式,提出了模拟绝缘平板材料表面电荷消散规律的数值计算模型,获得了表面电荷密度随时间的变化特性。基于有源静电探头法,得到了典型绝缘材料表面积聚的电晕电荷随时间消散的特性。试验与数值计算结果基本吻合,证明了提出模型的有效性。研究发现环氧树脂材料的电荷消散以体传导消散方式为主导,空间离子中和消散作用较小,研究结论可为工程设计提供参考。
The space charge generated by DC corona discharge can be accumulated on the insulation surface of equipment under the action of constant DC electric field,causing local electric field distortion on the surface of the insulator,accelerating the aging of the insulator and reducing the insulation performance.Therefore,it is very important to study the dissipation characteristics of insulator surface charge for the insulation optimization design of HVDC electrical equipment.Based on the basic theory of surface charge dissipation of insulating materials,and considering three typical charge dissipation modes,this paper proposes a numerical calculation model to simulate the surface charge dissipation law of insulating flat materials,and obtains the characteristics of surface charge density change with time.Besides,based on the active electrostatic probe method,the characteristics of corona charge accumulated on the surface of typical insulating materials decaying with time.The experimental results basically agree with the numerical results,which proves the validity of the proposed model.The study finds that the charge dissipation of epoxy resin material is dominated by body conduction dissipation,and that the effect of space ion neutralization dissipation is small.The research conclusion can provide reference for engineering design.
作者
黄菁雯
邱露微
杜志叶
何靖萱
易凡
HUANG Jingwen;QIU Luwei;DU Zhiye;HE Jingxuan;YI Fan(School of Electrical Engineering of Wuhan University,Wuhan Hubei 430072,China;College of Science and Technology of China Three Gorges University,Yichang Hubei 443002,China;Air Force Early Warning Academy,Wuhan Hubei 430019,China)
出处
《湖北电力》
2023年第3期1-9,共9页
Hubei Electric Power
基金
国家自然科学基金资助项目(项目编号:51977152)
国家电网公司华中分部科技项目(项目编号:5214AJ220017)。
关键词
表面电荷
消散特性
数值计算
电荷消散途径
surface charge
decay characteristics
numerical calculation
charge decay mechanism
