动态电弧模型下特快速瞬态过电压特性的计算与分析  

Calculation and Analysis of Very Fast Transient Over-voltage Characteristic on the Condition of Dynamic Arcing Model

作　　者：林莘[1] 王娜[1] 徐建源[1] 

机构地区：[1]沈阳工业大学电气工程学院,辽宁省沈阳市110870

出　　处：《中国电机工程学报》2012年第16期157-164,共8页Proceedings of the CSEE

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项目(201102169)~~

摘　　要：在特快速瞬态过电压(very fast transient over-voltage,VFTO)的仿真计算过程中,建立准确的隔离开关高频电弧模型是提高VFTO计算准确度的关键。在分段电弧模型的基础上,提出一种动态电弧模型。在预击穿阶段,该模型考虑击穿延时对VFTO的影响,采用双曲线形式的时变电阻;在熄弧阶段建立完整的麦也尔(Mayr-Schwarz)模型描述电弧的动态物理过程。结合某1100kV气体绝缘变电站(gas insulated substation,GIS)的实际电路,详细计算2种电弧模型下GIS内部的VFTO幅值、频率和陡度,同时讨论了击穿延时对VFTO波形的影响。计算结果表明:动态电弧模型下VFTO具有幅值较高、频率较高、上升陡度较大的特点;击穿延时对VFTO的初始上升时间和幅值有影响。通过VFTO仿真与实测数据相比较可知,动态电弧模型是分段电弧模型的进一步完善,对于提高VFTO仿真计算的精度有重要意义。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. A dynamic arcing model was presented based on the segmental arcing model. In the pre-breakdown stage, hyperbolic time-varying resistance was used in the model to consider the impact of breakdown delay time on VFTO waveform; in the extinction phase, a complete Mayr model was established to describe the dynamic physicalprocesses of arc. Moreover, taking the 1 lOOkV station as an example, this paper calculated the amplitude, the frequency and the gradient of VFTO in gas insulated substation （GIS） on the condition of two arcing models, and discussed the influence of breakdown delay time on VFTO waveform. It is found that VFTO has higher magnitude, higher frequency and higher gradient under the dynamic arcing model; breakdown delay time affects the initial rise time and amplitude of VFTO. By comparing VFTO simulation results with the measured data, it is found that the dynamic arcing model is the further improvement of the segmental arcing model and has great significance for improving the accuracy of the simulation calculation of VFTO.

关 键 词：动态电弧模型 特快速瞬态过电压特性 仿真计算 

分 类 号：TM85[电气工程—高电压与绝缘技术]