新型喷射气流防雷灭弧间隙的机理研究  

Research on New-type Jet Airflow Lightning Protection Arc Extinction Mechanism

作　　者：龙梦妮[1] 曾子轩 

机构地区：[1]广西大学电气工程学院,广西南宁530004 [2]新加城建筑学院

出　　处：《电气开关》2013年第2期32-36,共5页Electric Switchgear

基　　金：国家自然科学基金项目(50867002)

摘　　要：为解决输电线路频繁遭受雷害的问题,一种安装于输电线路的新型喷射气流防雷灭弧间隙已开发并成功运用于10kv和35kv线路。采用改进的mayr电弧模型对新型防雷灭弧间隙熄灭单相接地短路电流的灭弧性能进行仿真。运用二维N-S方程和k-ε湍流模型求解喷射气流的速度和范围,以确定mayr模型的耗散系数。通过开断试验确定电弧模型的时间常数。通过对比在小电流灭弧试验中示波器波形和高速摄像机拍摄画面,所描述模型可较好的反映气流对电弧的强烈灭弧作用,证明喷射气流防雷灭弧间隙可快速、强烈灭弧。In order to solve the problem of transmission lines that are frequently are subjected to damage caused by thunder, a new type jet airflow lightning protection arc gap which is installed in transmission lines has been applied to 10kV and 35kV lines. Arc extinction performance simulation by improved Mayr electric arc model to single - phase earth short - circuit current of new type lightning protection arc extinction gap flameout is carried out. Use two - dimensional N - S equation and k - e turbulent model to solve the speed and scope of the jet airflw so as to determine the dissipation factor of mayr model. Determine the time constant of the electric arc model through cut - off test. Compare the oscillo- scope waveform and high speed motion picture camera picture in small current arc extinction test. The model descirbed can better reflect the airflow to strong arc extinction function of the electric arc. It has been proved that the jet airflow lightning protection arc extinction gap can quickly and strongly put out electric arc.

关 键 词：防雷灭弧间隙 气吹灭弧 喷射气流场 改进的mayr模型 

分 类 号：TM72[电气工程—电力系统及自动化]