基于故障点电压频谱参数识别的无通道保护研究

首先在严格的傅里叶变换基础上分析了故障分量网络故障点叠加电压频谱，指出故障点电压频谱幅度的比值反映了故障点叠加电压的特征．在此基础上，提出了一种新的基于故障点电压频谱参数识别的线路保护原理．该原理通过识别保护安装处测量电压频谱比值和故障点电压频谱比值特征之间的关系判别区内、区外故障，并定量分析了上述比值和故障位置的关系．利用这一结论可构成利用单端电气量的无通道保护，仿真表明由该原理构成的继电保护具有较高的灵敏度，可以严格区分保护区内末端故障和区外故障．随着光互感器的成熟和应用，该方法有望得到实际应用．

Non-Communication Transmission Line Protection Based on Frequency Spectrum Recognition

The superimposed voltage component spectrum at fault point is investigated via Fourier analysis. The result shows that the voltage spectrum ratios between different frequencies represents the characteristic of superimposed voltage component at fault point. Furthermore, the relationship between the ratios at fault point and measurement point is deduced quantitatively to distinguish the internal fault fast from external fault for the transmission line with line trap. The EMTP simulation shows that, without the opposite information, the protective relaying based on the proposed principle can distinguish the internal fault from external fault fast with high sensitivity.