文章摘要
齐郑,郑宇航,杭天琦,等.基于暂态过程的非有效接地系统故障相辨识方法[J].电力系统自动化,2018,42(16):155-160. DOI: 10.7500/AEPS20171202001.
QI Zheng,ZHENG Yuhang,HANG Tianqi, et al.Transient Process Based Fault Phase Identification Method for Non-effectively Grounded System[J].Automation of Electric Power Systems,2018,42(16):155-160. DOI: 10.7500/AEPS20171202001.
基于暂态过程的非有效接地系统故障相辨识方法
Transient Process Based Fault Phase Identification Method for Non-effectively Grounded System
DOI:10.7500/AEPS20171202001
关键词: 单相电弧接地故障  故障相辨识  间歇性电弧  暂态高频分量  多尺度小波变换
KeyWords: single-phase-to-earth fault via arc  fault phase identification  intermittent arc  transient high-frequency components  multi-scale wavelet transformation
上网日期:2018-07-25
基金项目:国家重点研发计划资助项目(2016YFB0900105)
作者单位E-mail
齐郑 华北电力大学电气与电子工程学院, 北京市 102206  
郑宇航 华北电力大学电气与电子工程学院, 北京市 102206 harvardchaser@163.com 
杭天琦 华北电力大学电气与电子工程学院, 北京市 102206  
薛融 华北电力大学电气与电子工程学院, 北京市 102206  
刘自发 华北电力大学电气与电子工程学院, 北京市 102206  
摘要:
      针对中性点非有效接地系统的单相电弧接地故障,将故障相母线快速接地以熄灭原接地点电弧的处理措施得到了广泛的应用。该方法通常需要在一个周期内辨识故障相并动作,但以稳态判据为主的传统故障相辨识方法在间歇性电弧接地时易出现错误。文中分析了传统方法的失效原因,通过配电网等效模型推导了电弧熄灭后母线三相电压的暂态时域表达式,利用多尺度小波变换提取相电压高频分量,依据其幅值相位特征并结合传统判据,提出了新的暂态辨识方法以解决间歇性弧光接地的故障相辨识问题。仿真结论证明了方法的有效性。
Abstract:
      In order to suppress the arc of the single-phase-to-earth fault in neutral point non-effectively grounded system, the operation which switches the fault phase to the earth has been widely used. The prerequisite of this method is to identify fault phase correctly in one cycle. However, the traditional fault phase identification method based on steady process is prone to failure in the case of grounding fault via intermittent arc. This paper analyzes the defects of the conventional methods, establishes the equivalent model of distribution network, and derives the transient time domain expression of the three-phase voltages after the arc extinguishing. The multi-scale wavelet transformation is used to extract the transient high-frequency components of three-phase voltages. A novel method is proposed to identify the fault phase by calculating the amplitude and phase characteristics of the high-frequency components and the conventional methods are combined with this novel method. The simulation results prove the effectiveness of the proposed identification method.
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