快速暂态过电压下GIS绝缘特性研究综述  

Review of Insulation Characteristics of GIS Under Very Fast Transient Overvoltage

作　　者：张璐 黄国强 刘孝为 吴经锋 赵峥[2] 孙蕾[3] 张乔根[4] 

机构地区：[1]国网陕西省电力公司电力科学研究院,陕西西安710054 [2]国网北京经济技术研究院,北京102209 [3]中国水电顾问集团西北勘测设计研究院,陕西西安710065 [4]西安交通大学,陕西西安710049

出　　处：《陕西电力》2015年第7期70-77,共8页Shanxi Electric Power

基　　金：国家自然科学基金项目资助(51177132);国家电网公司科技项目资助(5226SX15001T)

摘　　要：随着电压等级升高,气体绝缘开关设备(GIS)的额定雷电冲击耐受电压和快速暂态过电压(VFTO)水平的差异逐渐减小,由VFTO引起的GIS绝缘事故日益增加。从工程应用角度出发,对VFTO下正常及存在缺陷的GIS气体间隙和绝缘子的绝缘特性进行了综述,详细对比了VFFO波头时间、振荡频率、衰减时间常数等特征参量对GIS绝缘特性的影响规律。指出了GIS绝缘特性的后期研究方向,即在统计分析工程实际VFTO波形的基础上提出VFTO典型试验波形,并研究典型波形下大尺寸GIS气体间隙和全尺寸绝缘子放电特性,给出GIS在VFTO和雷电冲击下的绝缘等价性关系,为工程实际中考虑VFTO特性的GIS绝缘配合提供基础数据。With the increase of voltage level, the difference between the rated lightning impulse （LI） and the very fast transient overvoltage （VFFO） level of gas insulated switehgear （GIS） decreases. Insulation failures caused by VFFO become severer. From the viewpoint of engineering application, the insulation characteristics of normal and defective SF6 gas gap and insulator of GIS under VFTO are reviewed. The influence law of typical parameters of VFTO, such as front time, oscillation frequency and damping time constant, on GIS insulation characteristics are compared. The further research direction of GIS insulation characteristics is proposed, that is the typical testing waveform should be proposed based on the statistical analysis of VFFO waveforms in engineering practice. The discharge characteristics of large size gas gap and full size insulator of GIS under typical waveforms should be researched. The insulation equivalence relation of GIS under VFTO and LI is given. The papaer can provide elementary data for GIS insulation coordination considering VFTO characteristics in engineering application.

关 键 词：气体绝缘开关设备 快速暂态过电压 雷电冲击 绝缘特性 SF6气体间隙 绝缘子 

分 类 号：TM864[电气工程—高电压与绝缘技术]