GIS中隔离开关电弧模型对快速暂态过电压的影响  

Influence of arcing model of GIS switching to VFTO

作　　者：王娜[1,2] 林莘[1] 徐建源[1] 王飞鸣[1] 

机构地区：[1]沈阳工业大学电气工程学院,辽宁沈阳110870 [2]沈阳化工大学信息工程学院,辽宁沈阳110142

出　　处：《电工电能新技术》2013年第1期85-88,共4页Advanced Technology of Electrical Engineering and Energy

基　　金：教育部高等学校博士学科点专项科研基金(20092102110001);辽宁省自然科学基金(201102169)资助项目

摘　　要：在快速暂态过电压(Very Fast Transient Overvoltage,VFTO)的仿真计算中,对隔离开关高频电弧的准确建模,是影响VFTO计算精度的关键因素。在分段电弧模型基础上,提出一种动态电弧模型。该模型在预击穿阶段考虑击穿延时对VFTO的影响,采用双曲线形式时变电阻;在熄弧阶段建立完整Mayr-Schwarz模型描述电弧的动态物理过程。并结合某1100kV GIS电站,详细计算动态电弧模型下的VFTO特性。结果表明,该模型对提高VFTO仿真计算结果准确性有着重要意义。In the process of simulation calculation of very fast transient over-voltage （ VFTO）, establishing an accurate high-frequency arc model is a key factor to improve the accuracy of VFTO. Dynamic arcing model is presented in the paper based on segmental arcing model. In the pre-breakdown stage, hyperbolic time-varying resistance was used in this model to consider the impact of breakdown delay time on VFTO waveform ; in the extinction phase, complete Mayr model was established to describe the dynamic physical processes of arc. Moreover, taking a 1100kV station as an example, this paper calculated in detail the amplitude, the frequency and the gradient of VFTO in GIS on the condition of varied arcing models, It is found that VFTO has higher magnitude, higher frequency and higher gradient under dynamic arcing model. By comparing VFTO simulation results with the measured data, it is found that the dynamic arcing model is the further improvement of segmental arcing model and has great significance for improving the accuracy of simulation calculation of VFTO.

关 键 词：隔离开关 动态电弧模型 气体绝缘变电站 快速暂态过电压 

分 类 号：TM501[电气工程—电器]