特高压气体绝缘开关设备瞬态外壳电压特性的试验研究

Experimental Research on the Characteristics of Transient Enclosure Voltage in Ultra High Voltage Gas Insulated Switchgear

特高压(ultra high voltage,UHV)气体绝缘开关设备(gas insulated switchgear,GIS)中隔离开关操作产生的瞬态外壳电压(transient enclosure voltage,TEV)具有的高幅值、陡波形、宽频带等瞬态特性影响变得越来越突出,可能危害到接触GIS设备的运行人员安全及GIS设备监控系统的正常运行。依托国网武汉1 000 kV交流UHV试验基地的2个UHV GIS设备试验回路,文中开展了TEV特性的试验研究。试验工况包括隔离开关速度为快速和慢速、回路负载侧是否预充直流电压、分支母线改变长度、隔离开关调换接线方向等接线方式,共开展了2 940次隔离开关合、分闸操作试验以及多测量点的TEV同步测量。通过对大量TEV测量结果的统计分析,获得了1 000 kV UHV GIS设备TEV的波形特征,包括TEV全过程波形特征、脉冲个数、波形总持续时间、单脉冲波形特征、频率成分、单脉冲持续时间、幅值上升时间以及预充/不预充直流电压、不同分支母线长度、调换隔离开关接线方向对TEV幅值特性的影响。并进一步统计分析了击穿电压、VFTO与TEV之间的相关性。通过一系列的试验研究,获得了特高压GIS设备的TEV波形特性,为进一步研究TEV建模仿真、标准制定以及安全防护等提供了依据。

Transient enclosure voltage （TEV） generated during switching of disconnector in ultra high voltage~ （UHV） gas insulated switchgear （GIS） on influences of high amplitude, steep wave, wide bandwidth and other transient characteristics had been becoming more prominent, and may affecte the safety of operating personnel touched with GIS and normal operation of GIS monitoring devices. This paper relied on two test circuits of UHV GIS in 1 000 kV UHV AC test base of State Grid in Wuhan, carried out experimental studies of TEV characteristics. Experimental conditions comprised a number of wiring layouts, such as disconnector switching with fast and slow speeds, test circuits at load side in pre-charge or no pre-charge DC voltage, branch bus with different lengths and disconnector switching with replacement directions etc. A total of 2 940 times of experiments during opening and closing of disconnector and TEV simultaneous measuring of multiple points had been carried out. By a large number of TEV measurement results of statistical analysis, the TEV waveform characteristics of 1 000 kV UHV GIS were obtained, including full waveform characters of TEV, pulse numbers, full waveform durations, single pulse waveform characters, frequency components, single pulse waveform durations, amplitude rising and TEV amplitude characters influence in pre-charge or no pre-charge DC voltage, different branch bus lengths, replacement disconnector switching directions. In further, correlations of TEV and striking voltages, and VFTO were statistically analyzed. Through a series of experimental research, the paper obtained the TEV waveform characteristics of UHV GIS, and the results have provided the basis for further study on TEV modeling and simulation, development of standards and security protection etc.