一起35 kV中性点不接地系统接地故障仿真推演

Simulation and Deduction of a Grounding Fault in a 35 kV Neutral Point Unearthed System

故障过程中产生的过电流在系统中会传递并引起故障扩大,故障设备燃烧、爆炸等情况会使得检测及还原难度增大,不利于故障还原工作。针对一起330 kV变电站35 kV中性点不接地系统接地故障,通过仿真分析,结合现场故障录波,还原了故障发展过程,明确了故障原因,为今后此类故障分析提供了思路和手段。

The overcurrent generated during the fault process will propagate through the system,leading to fault expansion.The combustion and explosion of faulty equipment will increase the difficulty of detection and reduction.By combining simulation analysis with field fault recordings,this paper reducts development process of a grounding fault of a 35 kV neutral point unearthed system in a 330 kV substation and clarifies its fault cause.Valuable insights and methodologies is provided for similar fault analysis in the future.