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,利用暂态零模电流进行配电网故障选线、定位,给出了故障定位步骤。MATLAB仿真结果表明,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。
This pap er analyzes the distribution of the transient zero-mode current in the distribution network and introduces the theory of correlation. Based on the fact that the transient zero-mode current of the fault line is of the maximum and its inner product with the non-fault line is below zero; and polarities of the transient zero model currents at the two sides of the fault point are reverse and wave forms are substantially different; and the related coefficient is less than the valve value and close to 0, the paper gives the fault location steps by using the transient zero-mode current to identify the fault line and fault location in the distribution network. The MATLAB simulation results show that the proposed fault location method based on the transient zero mode current for distribution network is correct and free of restrictions resulted from voltage initial angle, grounding resistance and neutral-point earthing ways.
出处
《电网与清洁能源》
2013年第4期29-33,共5页
Power System and Clean Energy
基金
国家自然科学基金项目(61263004)~~
关键词
小电流接地系统
暂态零模电流
相关系数
内积
故障选线
故障定位
the small current grounding system
transientzero-mode current
correlation coefficient
inner product
faultline selection
fault location
