高铁接触网的自能式组合间隙结构有效性研究

Effectiveness study on self-energy combined gap structure of catenary of high-speed railway

为了解决高铁接触网雷害问题,目前研制了一种应用于高铁接触网的组合型多断点灭弧防雷间隙装置(CMALPGD)。为了验证灭弧装置的可行性,论述了装置的产气及熄弧原理,建立了灭弧室电弧三维动态磁流体动力学(MHD)模型,并通过COMSOL Multiphysics仿真软件分析了CMALPGD动作时,灭弧室断口处电弧的温度、电导率及产生的高速气流速度(最高速度达1 000 m/s)的变化情况,验证了高速气流能够作用于电弧并熄灭电弧,同时抑制电弧发展,整个熄弧时间约为2. 5 ms。同时构建试验电路进行灭弧试验,得出试验条件下的灭弧时间为3. 0 ms,且一段时间内电弧未发生重燃。仿真和实验结果几乎相同,充分验证了CMALPGD应用于高铁接触网的可能性。

In order to solve the problem of lightning damage in catenary of high-speed railway,a combined multiplebreakpoints arc-extinguishing lightning protection gap device( CMALPGD) for catenary of high-speed railway has been developed in this paper. In a bid to verify the feasibility of the arc-extinguishing device,this paper discusses the gas production and arc-extinguishing principle of the device,establishes the three-dimensional dynamic magnet hydro dynamics( MHD) model of arc-extinguishing chamber. Through the COMSOL multi-physics simulation software,the temperature,conductivity and high-speed airflow velocity( maximum speed of 1000 m/s) of the arc at the break of the arc-extinguishing chamber were analyzed during the CMALPGD operation. It is verified that the high-speed airflow can act on the arc and extinguish the arc. The entire arc-extinguishing time is about 2. 5 ms. Meanwhile,the test circuit was built for arc-extinguishing test,and the arc-extinguishing time under the test conditions was 3. 0 ms and the arc did not re-ignite for a period of time. The simulation and test results are almost the same,which fully proves the possibility of applying CMALPGD to catenary of high-speed railway.