直流电压下盆式绝缘子表面电荷对沿面闪络的影响  

Effect of Surface Charge on Surface Flashover of Basin-type Insulator Under DC Voltage

作　　者：金硕 郭世瑞 杨宇晨 吴子威 张晓星 张瑞 JIN Shuo;GUO Shirui;YANG Yuchen;WU Ziwei;ZHANG Xiaoxing;ZHANG Rui(Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment,Hubei University of Technology,Wuhan 430068,China;Xiangyang Industrial Institute of Hubei University of Technology,Xiangyang 441100,China;Xiangyang Jiuding Haotian Environmental Protection Equipment Co.,Ltd.,Xiangyang 441100,China)

机构地区：[1]湖北工业大学新能源及电网装备安全监测湖北省工程研究中心,武汉430068 [2]襄阳湖北工业大学产业研究院,襄阳441100 [3]襄阳九鼎昊天环保设备有限公司,襄阳441100

出　　处：《高电压技术》2025年第3期1180-1190,共11页High Voltage Engineering

基　　金：湖北省自然科学基金创新群体(2021CFA025);太阳能高效利用及储能运行控制湖北省重点实验室开放基金(HBSEES202401)。

摘　　要：直流电压下GIS盆式绝缘子表面的电荷积聚会引起电场畸变,降低绝缘裕度,在电压极性反转过程中电场畸变情况更加严重,发生沿面闪络等故障的风险将进一步提升。围绕上述问题,该文以缩比盆式绝缘子为主要研究对象,采用有限元仿真研究了正、负电压下以及极性反转电压下的盆式绝缘子表面电荷分布特性,并结合闪络试验揭示了电荷分布对闪络电压的影响。研究结果表明,电荷密度随着加压时间的增大而增加,导致闪络电压降低,正极性电压下闪络电压最大可下降9.3%,负极性电压下闪络电压最大可下降10.7%;在负极性转正极性过程中,闪络电压最大可下降12.3%,而在正极性转负极性过程中,闪络电压最大可下降29.4%;且闪络电压与电荷密度表现为负相关。The accumulation of charges on the surface of GIS basin-type insulators under DC voltage can cause electric field distortion,reduce insulation margin,and make the electric field distortion more severe during voltage polarity rever-sal.The risk of surface flashover and other faults will further increase.Based on the above issues,this paper focuses on the study of downsized basin-type insulators,and uses finite element simulation to study the surface charge distribution characteristics of basin-type insulators under positive voltages,negative voltages,and polarity reversal voltages.Com-bined with flashover tests,the impact of charge distribution on flashover voltage is revealed.The research results show that the charge density increases with the increase of stating voltage time,leading to a decrease in flashover voltage.Un-der positive polarity voltages,the maximum flashover voltage can decrease by 9.3%,and under negative polarity voltages,the maximum flashover voltage can decrease by 10.7%.During the transition from negative polarity to positive polarity,the maximum flashover voltage can decrease by 12.3%,while during the transition from positive polarity to negative po-larity,the maximum flashover voltage can decrease by 29.4%.Meanwhile,the flashover voltage is negatively correlated with the charge density.

关 键 词：电荷积聚 沿面闪络 盆式绝缘子 直流GIS 极性反转 

分 类 号：TM216[一般工业技术—材料科学与工程]