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
基金项目(Foundation):
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
参考文献(References):
- [1]龙毅,欧阳金鑫,熊小伏,等.基于零序功率变化量的配电网单相高阻接地保护[J].电工技术学报,2019,34(17):3687-3695.
- [2]范迎青,高文逸.6~10 kV电网中性点经中电阻接地的单相接地保护[J].电力自动化设备,2000,20(1):12-14.
- [3]崔韬.配电线路高阻接地故障检测技术的研究[D].北京:清华大学,2009.
- [4]刘健,张小庆,申巍,等.中性点非有效接地配电网的单相接地定位能力测试技术[J].电力系统自动化,2018,42(1):138-143.
- [5]刘健,张志华,张小庆,等.基于配电自动化系统的单相接地定位[J].电力系统自动化,2017,41(1):145-149.
- [6]孙旭,陈晓彬,邢文忠.小电阻接地方式下高阻接地保护拒动解决方案研究及应用[J].电工技术,2018(24):51-53.
- [7]李震球,王时胜,吴丽娜.一种谐振接地系统电弧高阻接地故障选线新方法及仿真[J].电力系统保护与控制,2014,42(17):44-49.
- [8]罗建,何建军,王官洁.消弧线圈接地系统的单相接地选线研究[J].电力系统保护与控制,2009,37(4):1-4.
- [9]盛亚如,丛伟,卜祥海,等.基于中性点电流与零序电流投影量差动的小电阻接地系统高阻接地故障判断方法[J].电力自动化设备,2019,39(3):17-22.
- [10]许庆强,许扬,周栋骥,等.小电阻接地配电网线路保护单相高阻接地分析[J].电力系统自动化,2010,34(9):91-94.
- [11]葛乃成,刘艳敏,倪腊琴.电力系统高阻接地故障保护综述[J].华东电力,2011,39(5):753-756.
- [12]蔡燕春,董凯达,张少凡,等.10 kV配电线路高阻接地检测技术[J].广东电力,2017,30(10):126-131.
- [13]董凯达,蔡燕春,余群兵,等.小电阻接地系统灵活高阻接地保护研究[J].广东电力,2019,32(1):109-117.
- [14]PSRC Working Group D15.High impedance fault detection technology[R].1996.
- [15]HUANG S J,HSIEH C T.High-impedance fault detection utilizing a morlet wavelet transform approach[J].IEEE Transactions on Power Delivery,1999,14(4):1401-1410.
- [16]耿建昭,王宾,董新洲,等.中性点有效接地配电网高阻接地故障特征分析及检测[J].电力系统自动化,2013,37(16):85-91.
- [17]王宾,耿建昭,董新洲.配网高阻接地故障伏安特性分析及检测[J].中国电机工程学报,2014,34(22):3815-3823.
- [18]孙万麟,王超.基于改进的软阈值小波包网络的电力信号消噪[J].海军工程大学学报,2019,31(4):79-82.
- 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