中低速磁浮列车车体接地回流特性研究

Study of Grounding Current Characteristics of Power Supply Main Loop in the Medium-low Speed Maglev System

针对目前中低速磁浮列车采用的第三轨受流方式,建立了车体放电主电路的接地阻容(R-C)网络的数学函数,结合函数的波特图和实测频谱数据开展了接地电流特征研究。理论分析与实测数据表明,车体电位累积与泄放体现出动态变化与平衡特性,可进一步优化R-C参数并采取悬浮架与车体分开接地,以形成快速导流通道,改善接地性能。

As to the power supply main loop in the medium-low speed maglev system which employ the third trail, a mathematical model of resistance capacitance （R-C） ground network was built, and ground current characteristics were analyzed from its bode diagram and measured spectral data. The theoretical and experimental results showed that the accumulation and discharge of vehicle body potential had dynamic balance characteristic, by further optimizing the R-C parameters as well as separating the suspension modulars from the vehicle body, a rapid current diversion channel was formed to improve the system grounding performance.