牵引网电分相的联合建模与潜在过电压抑制研究

Traction Power Network Sectioning United Modeling and Uppression of Potential Over-voltage

针对电力机车通过关节式电分相造成车顶绝缘被击穿的问题,通过潜在电路模型的构建,提出了一种电分相过电压的抑制方法。建立了锚段关节式电分相的链式电路模型,分析了机车通过电分相过渡的暂态过程,探讨了平衡接线和AT供电对潜在过电压的影响,利用机车-电分相-牵引网联合仿真模型,进行感应电压和过电压仿真实验。结果表明:中性线加装抑制电路,可使过电压最大值由108.0 kV降为64.8 kV,减小了过电压对牵引网和机车的绝缘冲击作用。

A suppression method of electrical sectioning over-voltage is proposed by constructing a potential circuit model because the over-voltage causes insulation breakdown when an electric locomotive goes through articulated electrical sectioning. A chain-type equivalent circuit model of electrical sectioning structure is established, the transition process of a locomotive going through electrical phase is analyzed,and the balance wiring and the influence of AT power supply on potential over-voltage are discussed. The induction voltage and the over-voltage are simulated by using the united simulation model of locomotive-electrical traction-network. The results show that installing a suppression circuit on electrical sectioning neutral wires can reduce the maximum over-voltage from 108.0 kV to 64.8 kV to weaken the impact of over-voltage on the insulation of traction power network and locomotives.