气体绝缘开关设备的隔离开关分合空载短母线时特快速暂态过电压及特快速暂态电流测量  

Measuring of Very Fast Transient Over-voltage and Very Fast Transient Current Generated by Disconnector in Gas Insulated Switchgear Switching on/off Short Buses with no Load

作　　者：詹花茂[1,2] 赵承楠[1,2] 段韶峰[1,2] 李成榕[1,2] 李志兵[3] 欧阳卓[1,2] 

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206 [2]华北电力大学新能源电力系统国家重点实验室,北京102206 [3]中国电力科学研究院,北京100192

出　　处：《高电压技术》2013年第6期1317-1323,共7页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2011CB209405);国家电网公司科技项目(SGKJJSKF[2009]776;[2011])~~

摘　　要：为深入研究气体绝缘开关设备(GIS)的隔离开关分合空载短母线产生的特快速暂态过电压(VFTO),建立了252kV GIS试验回路并研制了VFTO、特快速暂态电流(VFTC)和开距测量系统。该系统采用手孔式电容分压器测量、Rogowski线圈及光纤传输系统、位置传感器分别测量VFTO、VFTC、开关开距。对上述测量系统进行了标定:VFTO测量系统低频截止频率<20Hz,高频截止频率>80MHz;VFTC测量系统带宽达到70MHz;开距测量系统误差<1.5%。结果表明各系统满足测量要求。试验结果表明:在试验回路上实现了隔离开关分合闸时VFTO、VFTC及开距的同时测量,获得了VFTO和VFTC的典型波形、隔离开关间隙的击穿电压特性和燃弧规律。该试验回路产生的VFTO幅值最大值为447.02kV,上升时间约为13ns;VFTC的幅值最大值为2.61kA,上升时间约为7ns。VFTO和VFTC的主要频率均为4.4、23.3、44.2MHz,主要取决于回路的电感、电容及暂态行波的折反射。间隙的击穿电压没有明显的极性效应。燃弧时间<2μs。To investigate the very fast transient over-voltage （VFTO） generated by disconnector in gas insulated switchgear（GIS） switching on/off short buses with no load, we developed a system for measuring VFTO, very fast transient current （VFTC}, and gap distance, as well as a 252 kV GIS experimental circuit for testing the system. In the system, VFTO was measured by a hand-hole capacitive sensor; VFTC was measured by a Rogowski coil with fiber optic transmission system; the gap distance was measured by a position sensitive detector. Moreover, the measurement systems were calibrated, showing that the VFTO measuring system had a lower cut-off frequency lower than 20 Hz, and an upper cut-off frequency higher than 80 MHz, the frequency bandwidth of the VFTC measurement system was 70 MHz, and the gap distance measurement system had errors less than 1. 5o//oo. These parameters apparently met the requirements of measurement. Test results of the experimental system prove that the measurement systems can measure VFTO and VFTC induced by disconnector switching simultaneously, as well as the gap distance. Typical waveforms of VFTO and VFTC, breakdown voltage characteristics and the arcing law of the disconnector can be obtained in the tests- the VFTO has its highest amplitude of 447.02 kV, with a rise time about 13 ns; the VFTC has its highest amplitude of 2.61 kA, with a rise time about 7 ns. The primary frequencies of both VFTO and VFTC are 4.4, 23.3, and 44.2 MHz, depending on the inductance, capacitance of the circuit, and the reflection of travelling wave. No polarity effect exists in the breakdown voltage of the gap, and the arcing time is less than 2 μs.

关 键 词：特快速暂态过电压 特快速暂态电流 气体绝缘组合电器 光纤传输系统 开距 位置传感器 

分 类 号：TM564.1[电气工程—电器] TM86