GIS隔离开关操作产生的壳体电位升高和VFTO关系  

Relationship Between Transient Enclosure Voltage and Very Fast Transient Overvoltage Generated During Disconnector Operations in Gas Insulated Switchgear

作　　者：关永刚[1] 蔡元纪[1] 刘卫东[1] 陈维江[2] 

机构地区：[1]清华大学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,北京100084 [2]国家电网公司,北京100031

出　　处：《高电压技术》2015年第12期4097-4104,共8页High Voltage Engineering

基　　金：国家自然科学基金(51277106);国家重点基础研究发展计划(973计划)(2011CB209405)~~

摘　　要：气体绝缘开关设备(GIS)中的隔离开关操作,会产生特快速瞬态过电压(VFTO)和壳体电位升高(TEV)等问题。该研究旨在通过试验方法研究TEV和VFTO之间的关系,并分析TEV在GIS回路中的形成原因和传播规律。研究中,首先利用自制的TEV和VFTO测量系统,在武汉特高压交流试验基地对GIS隔离开关操作时产生的TEV和VFTO波形进行了测量。从暂态波形时间对应角度分析,所有统计的时间偏差均在[-90μs,20μs]的区间内,证明了2者在时序上的对应关系;从幅值比例关系角度,使用Spearman相关系数分析,证明了TEV波形上的脉冲电压与隔离开关断口间的击穿电压满足正比单值函数关系。通过引入比例系数,分析了试验回路上不同位置处的TEV幅值,从试验角度验证了行波传输理论对TEV成因的解释。该研究还给出了通过少量现场试验确定某一位置最大TEV的方法,估算试验回路中可能出现的TEV最大值为51.37 k V,这一估算方法能够为TEV的理论分析和仿真计算提供支持。Disconnector operations in gas insulated switchgear（GIS） may induce very fast transient overvoltage （VFTO） and transient enclosure voltage （TEV）. To obtain the relationship between TEV and VFTO from the viewpoint of experi- ment, we analyzed the theory of TEV generation and propagation. TEV and VFTO waveforms during disconnector operations were obtained by self-developed measurement systems at Wuhan ultra-high voltage AC test base. The transient waveform-time analyses show that the subtle differences [-90 μs, 20 μs] between the breakdown time and its correspond- ing pulse time indicate a good relationship between TEV and VFTO. Meanwhile, analyses of breakdown time and amplitude ratio by Spearman correlation coefficient show that TEV pulse voltage is directly proportional to the corres- ponding VFTO breakdown voltage between contacts. Then, TEV magnitudes at different measurement points in the test circuit are analyzed through the introducing ratio coefficient, so as to validate the transmission line theory from the expe- rimental view. Furthermore, we provided a method to obtain the largest TEV magnitude through a small amount of on-site measurements, by which the maximum TEV value of 51.37 kV in the test circuit was estimated. Moreover, this method would be helpful to TEV theoretical analysis and simulation.

关 键 词：气体绝缘开关设备 壳体电位升高 特快速瞬态过电压 隔离开关 相关分析 比例系数 

分 类 号：TM564.1[电气工程—电器]