高电压技术2013，Vol.39Issue(6)：1317-1323,7.DOI:10.3969/j.issn.1003-6520.2013.06.005
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
摘要
Abstract
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 1.5％.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Key words
very fast transient over-voltage/ very fast transient current/ gas insulated switchgear/ fiber transmission system/ gap distance/ position sensitive detector引用本文复制引用
詹花茂,赵承楠,段韶峰,李成榕,李志兵,欧阳卓..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[J].高电压技术,2013,39(6):1317-1323,7.基金项目
国家重点基础研究发展计划(973计划)(2011CB209405) （973计划）
国家电网公司科技项目(SGKJJSKF[2009]776 （）
[2011]) （）
Project supported by National Basic Research Program of China (973 Program)(2011CB209405),Science and Technology Project of SGCC (SGKJJSKF[2009]776,[2011]). （973 Program）
