【摘要】 从理论上推导出了考虑集肤效应的三相输电线路的正序阻抗和零序阻抗随频率变化的公式,分析了输电线路的阻抗频率特性及输电线路阻抗的依频特性对行波定位和保护的影响,并提出了应用小波包分析对行波信号进行分解,分频段进行行波速度的计算并记录行波波头到达的时间来进行故障定位的方法.通过ATP仿真分析表明,该故障定位方法能有效消除行波色散特性的影响,提高故障定位的精度.更多还原

【Abstract】 The formula for the change of the positive-sequence and zero-sequence impedance of!three phase transmission line with frequency are put forward by considering skin effect in this paper.The frequency characteristics of transmission line impedance and its impact on the traveling wave location are also analyzed in the paper.A wavelet packet in traveling wave signalis is used,a velocity in different bands is calculated and the arrival time of traveling wave to decide the fault location is recorded.ATP simulation results show that the method can reduce the effect of dispersion characteristics,improve the precision of fault location.更多还原