摘要
由于气体绝缘变电站(GIS)隔离开关操作而产生的快速暂态过电压(very fast transient overvoltage,VFTO),具有高频率、上升时间短、高幅值等特点,对GIS本体及相邻设备有较大危害。文中在隔离开关测量系统的基础上,研究了变压器耦合电容和隔离开关分合闸速度对VFTO和快速暂态电流(very fast transient current,VFTC)的影响。当变压器耦合电容分别取300、800、1 100 p F时,试验结果得出VFTO和VFTC的幅值会随着耦合电容的升高而增大。测量了隔离开关在6种不同劲度系数弹簧下的分合闸速度,研究了隔离开关分合闸速度不同时对VFTO和VFTC的影响,得出当隔离开关速度越慢时,隔离开关产生的VFTO的幅值越高。在两种不同弹簧速度情况下,统计了特快速暂态电压和电流的频率、幅值和上升时间,并进行了分析。
Disconnector switching in gas insulated substation （GIS）may generate very fast transient overvoltage （VFFO）and current（VFTC）, which are characterized by their high peak value, short rise time and high frequencies. This overvoltage may cause high electric stress to the insulation in GIS and the adjacent apparatuses. So, it is very important to study the characterizes of VFTO and VFTC for the power system＇s security and stability. This paper studies the influences of transformer＇s coupling capacitance and the switching speed of disconnector to the VFTO and VFTC based on the measuring system. When the coupling capacitance is 300 pF,800 pF and 1 100 pF, the test result shows that the amplitude of VFTO and VFTC will increase with the rising of coupling capacitance. The closing and opening speeds of the disconnector equipped with six springs with different stiffness coefficients are measured and the influences of the switching sppeds of the disconnector on VFTO and VFTC are investigated. It is concluded that the amplitude of VFFO increases as the switching speed getting slowly. The frequency, amplitude and rise time of VFTO and VFTC are analyzed statistically under the two spring speeds
出处
《高压电器》
CAS
CSCD
北大核心
2015年第3期93-98,104,共7页
High Voltage Apparatus
关键词
快速暂态过电压
隔离开关
耦合电容
劲度系数
very fast transient overvoltage（VFTO）
disconnector
coupling capacitance
stiffness coefficient
