摘要
分析了配电网暂态零模电流的分布情况,引入了相关性理论,根据故障线路的暂态零模电流有效值最大且与非故障线路的内积小于0,故障点两侧的暂态零模电流极性相反,波形差异大,相关系数小于阀值且接近0的特征,提出了基于暂态零模电流的配电网故障选线、定位方法,给出了故障定位步骤。MATLAB仿真结果表明,所提出的基于暂态零模电流的配电网故障选线、定位方法正确,具有不受电压初相角、接地电阻、中性点接地方式制约等优点。
The distribution of transient zero-mode cmTent in power system is analyzed. The theory of correlation is introduced. According to the characteristic of transient zero-mode current of fault line is maximum and inner product between non-fault line is less than 0, polarity of transient zero-mode current both sides of the failure point is opposite,wavefoml difference,correlation coefficient is less than the threshold value and close to 0,the fault location in distribution network based on transient zero-mode current ＆ the steps of fault location are put forward. MATLAB simulation results show that the method of fault location in distribution network based on transient zero-mode current is right, and has advantages of not affected by initial phase angle of voltage, grounding resistance, the neutral point grounding mode.
出处
《陕西电力》
2013年第5期34-37,48,共5页
Shanxi Electric Power
基金
甘肃省普通高等学校研究生导师资助项(1004-06)
关键词
小电流接地系统
暂态零模电流
相关系数
内积
故障定位
the small current grounding system
transient zero-mode current
correlation coefficient
inner product
fault location
