110kV电阻接地系统电气设备适应性研究及试验

Research on Adaptability of Electrical Equipment of 110kV Resistance Grounding System and Experiment

110kV配电网采用中性点经合适的电阻值接地后,能够消除单相接地故障时负荷侧电压出现的暂降/暂升,但同时也会引起系统中性点和非故障相对地电压的升高。因此,原工作于直接接地系统的部分110kV电气设备不能直接用于110kV中性点经电阻接地系统中。采用理论分析和数字仿真的方法,对国产110kV电气设备用于中性点经电阻接地系统的适应性进行了研究,给出了设备的选型建议,并通过现场试验证明了国内110kV配电网采用中性点经电阻接地方式的可行性和优越性。

1 10 kV neutral resistance grounding system is able to eliminate voltage sag on the load side due to the single-phase grounding fault.At the same time,however,the voltage of the neutral point and non-fault phase voltage to ground will be elevated.So part of the 1 10 kV electrical equipment used in the original neutral direct grounding system cannot be used directly in the 1 10 kV neutral resistance grounding system.The adaptability of electrical equipment for the 1 10 kV neutral resistance grounding system is studied through theoretical analysis and simulation.Suggestions are made for selection of 1 10 kV electrical equipments.And a field experiment on the 1 10 kV neutral resistance grounding system is performed to prove the feasibility and excellence of 1 10 kV neutral resistance grounding system. This work is supported by State Grid Hubei Electric Power Company(No.521 5B014003 H).