浙江电力

2020, v.39;No.295(11) 112-118

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基于波形特征的小电阻接地配电网高阻接地故障分析
Analysis of High Resistance Grounding Fault of Small Resistance Grounding Distribution Network Based on Waveform Features

牛纯春,陆晓东,章琦,魏春晖,杨炀,冯新江
NIU Chunchun,LU Xiaodong,ZHANG Qi,WEI Chunhui,YANG Yang,FENG Xinjiang

摘要(Abstract):

随着配网系统电容电流日渐增大,中性点经小电阻接地方式得到推广应用。然而,小电阻接地方式存在高阻接地时零序电流保护无法切除故障线路的问题。首先,从高阻接地故障的非线性特征出发,分析系统伏安特性,发现高阻接地时故障线路伏安特性曲线会发生阻性畸变,非故障线路伏安特性曲线会发生容性畸变。然后,基于零序电流波形的时域特征,提出分别采用峰值检测法和极值检测法识别单相高阻接地故障线路和非故障线路。最后,通过仿真实验验证了该方法的有效性。
With the increase of capacitive current of the distribution network system, neutral point grounding through small resistance has been widely used. However, zero-sequence current protection cannot remove the fault line in the small-resistance grounding mode when high resistance grounding occurs. Firstly, based on the non-linear characteristics of high resistance grounding fault, the voltage-ampere characteristics of the system are analyzed. It is found that the voltage-ampere characteristics of the fault line will be resistively distorted and the voltage-ampere characteristics of the non-fault line will be capacitively distorted when the high resistance grounding fault occurs. Then, based on the time-domain characteristics of the zero-sequence current waveform, the peak detection method and extreme detection method are proposed to identify single-phase high resistance grounding fault line and non-fault line. Finally, the effectiveness of this method is verified by simulation experiments.

关键词(KeyWords): 高阻接地故障;伏安特性;阻性畸变;容性畸变;波形特征
high resistance grounding fault;voltage-ampere characteristics;resistive distortion;capacitive aberration;waveform feature

Abstract:

Keywords:

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作者(Author): 牛纯春,陆晓东,章琦,魏春晖,杨炀,冯新江
NIU Chunchun,LU Xiaodong,ZHANG Qi,WEI Chunhui,YANG Yang,FENG Xinjiang

DOI: 10.19585/j.zjdl.202011017

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