高压电器2025，Vol.61Issue(3)：1-8,41,9.DOI:10.13296/j.1001-1609.hva.2025.03.001
SF6气体压力对GIS隔离开关操作时暂态电压过程的影响分析
Analysis on Influence of SF6 Gas Pressure on Transient Voltage Process During Operation of GIS Disconnector
摘要
Abstract
SF6 gas pressure is directly related to the dynamic insulation characteristics between contacts in the opening and closing process of gas insulated switchgear(GIS)disconnector.In order to study the influence of varia-tion of SF6 gas pressure on the transient voltage process excited during the operation of the disconnector,the test platform is set up in accordance with the switching busbar duty 1 of GIS disconnector and also based on 1 100 kV GIS disconnector.The gas pressure of the disconnector is increased from 0.4 MPa to 0.5 MPa and 0.54 MPa respec-tively,and the transient voltage on both sides of the open contacts during the operation of the disconnector is accu-rately measured by using the ultra-wide-band voltage monitoring system.The time domain characteristics,spectrum distribution and time-frequency distribution characteristics of transient voltage are analyzed.It is found through test data analysis that with the increase of SF6 gas pressure,the closing time of GIS disconnector is decreased nonlinearly from 333 ms to 242 ms.The overshoot coefficient of very fast transient voltage(VFTO)at AC power supply side is decreased with the increase of gas pressure and there is no obvious change in the overshoot coefficient at short bus side.The opening time is approximately linearly reduced from 169 ms to 98 ms,the residual voltage at the short bus side is significantly reduced after opening operation,and the single transient overvoltage overshoot coefficient on both sides has no obvious change.In case of increase of SF6 gas pressure,the main frequency point of the transient voltage on both sides of the open contacts remains unchanged during the opening and closing process,but in the high-frequency region above 10 MHz,the lower the gas pressure,the smaller the high-frequency component.The maximum instantaneous frequency of the transient voltage on both sides of the open contacts does not change signif-icantly.The low frequency component below 10 MHz is varied with the gas pressure and the duration remains un-changed.However,the high frequency component above 10 MHz is increased with the gas pressure and the dura-tion is longer.The study in this paper is conducive to further optimize the field operation condition for GIS discon-nector and improve the dynamic insulation characteristics in the operation process.关键词
GIS隔离开关/SF6气体压力/特快速暂态过电压/频谱分布/时频特征Key words
GIS disconnector/SF6 gas pressure/very fast transient voltage(VFTO)/spectrum distribution/time-frequency domain characteristics引用本文复制引用
何雨峰,丁登伟,卢贵有,程浪,邵帅,刘卫东,何良..SF6气体压力对GIS隔离开关操作时暂态电压过程的影响分析[J].高压电器,2025,61(3):1-8,41,9.基金项目
国家自然科学基金(51977120).Project Supported by National Natural Science Foundation of China(51977120). （51977120）
