252kV GIS用SF6/N_(2)混合气体局放特性研究  

Research on Partial Discharge Characteristics of SF6/N_(2)Gas Mixture in 252 kV GIS

作　　者：赵彦杰 陈丽安 袁传镇 ZHAO Yanjie;CHEN Li’an;YUAN Chuanzhen(School of Electrical Engineering and Automation,Xiamen University of Technology,Fujian Xiamen 361024,China;Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control,Fujian Xiamen 361024,China;Xuji(Xiamen)Intelligent Switchgear Manufacturing Co.,Ltd.,Fujian Xiamen 361101,China)

机构地区：[1]厦门理工学院电气工程与自动化学院,福建厦门361024 [2]厦门市高端电力装备及智能控制重点实验室,福建厦门361024 [3]许继(厦门)智能电力设备股份有限公司,福建厦门361101

出　　处：《高压电器》2023年第9期169-175,183,共8页High Voltage Apparatus

基　　金：福建省自然科学基金(2023J011443)。

摘　　要：为了研究工频电压下SF_(6)/N_(2)混合气体的局放特性及其在GIS中的工程应用前景,文中设计了尖端、气隙两种GIS局放缺陷模型并进行了电场仿真分析,搭建了252 kV GIS局放试验样机,在绝缘等效基础上分别进行了不同气体混合比(2∶8、3∶7、4∶6)、不同气压(0.4、0.5、0.6 MPa)条件下SF_(6)/N_(2)混合气体的局放试验。仿真及试验结果表明:SF_(6)/N_(2)混合气体的局放起始电压、熄灭电压、视在放电量均小于纯SF_(6),说明SF_(6)加入N_(2)可以降低其对电场畸变的敏感程度。通过对比SF_(6)/N_(2)混合气体和纯SF_(6)之间的局放图谱,发现SF_(6)/N_(2)混合气体与同等工频绝缘强度的纯SF_(6)局放水平相当,在不改变现有GIS结构和设计原则的前提下可以替代纯SF_(6)。In order to study the partial discharge characteristics of SF_(6)/N_(2)gas mixture under power frequency voltage and its engineering application prospect in GIS,such two partial discharge defect models as tip and spherical gap of GIS was designed and subjected to electric field simulation analysis.The sample for the partial discharge of 252 kV GIS was set up and,on the basis of insulation equivalence,the partial discharge test of SF_(6)/N_(2)gas mixture is performed at different gas mixing ratio(2∶8,3∶7,4∶6)and different gas pressure(0.4 MPa,0.5 MPa,0.6 MPa)respectively.The simulation and test results show that the partial discharge inception voltage,extinguishing voltage and apparent discharge of SF_(6)/N_(2)gas mixture are less than those of pure SF_(6),indicating that adding N_(2)to SF_(6)can reduce its sensitivity to electric field distortion.By comparing the partial discharge chromatograph between SF_(6)/N_(2)gas mixture and pure SF_(6),it is found that the partial discharge of SF_(6)/N_(2)gas mixture is comparable to that of pure SF_(6)at same power frequency insulation strength and,on the premises of not changing the existing GIS structure and design principle,can replace pure SF_(6).

关 键 词：GIS母线 SF6/N_(2)混合气体 局放 绝缘等效 气压 

分 类 号：TM213[一般工业技术—材料科学与工程] TM855[电气工程—电工理论与新技术]