船舶中压电网弧光接地过电压的研究

Research on Arc Grounding Over-Voltage of Shipboard Medium-Voltage Power Network

船舶中压电网中性点接地方式不同,发生单相接地故障时,内部所产生的弧光接地过电压大小也会有所差异。在PSCAD软件中,建立发生弧光接地的过电压模型,对几种基本接地方式的内部过电压抑制情况进行了仿真研究。仿真结果表明,中性点经大电阻接地方式对单相接地故障所引起的弧光过电压有良好的抑制作用,能够保证系统供电的安全、可靠,是一种合理的接地方式。

In shipboard medium-voltage power system,when single-phase earth fault occurs,different neutral point grounding ways,it generates vary internal over-voltage.Then,it establishes the simulation model of arc grounding’s overvoltage in PSCAD software.The simulation of the over-voltage suppression in different grounding modes is carried out.From the simulation results,it can be concluded that the high-resistance grounding of the neutral point can effectively suppress the arc grounding over-voltage caused by the single-phase grounding fault of the system,and ensure the safety and reliability of the power supply.It is a reasonable neutral grounding method.