针对被动式选线方法在谐振及高阻接地故障中可靠性不足的问题，提出一种基于注入方波信号和广义S变换能量熵的配电网故障选线方法。首先，分析发生单相接地故障时系统内注入信号的分布特征，并在此基础上合理分析注入方波信号的频率选择。其次，利用小波阈值算法和快速独立分量分析对注入信号后的零序电流进行预处理，达到滤除噪声和工频分量的效果。最后，对预处理后的零序电流信号进行广义S变换，计算在注入信号特征频率下的广义S变换能量熵，通过对熵值大小的比较来确定故障线路。仿真和现场实测波形验证结果表明，所提选线方法具有较强的适用性和可靠性，能够在不同工况下实现准确选线，且具备较好的抗噪能力和耐高过渡电阻能力。

Aiming at the problem that the current passive line selection method has insufficient reliability in resonance and high resistance grounding faults, a fault line selection method for distribution network based on injected square wave signal and generalized S-transform energy entropy was proposed. Firstly, the distribution characteristics of the injected signal in the system when a single-phase ground fault occurs were analyzed, and the frequency selection of the injected square wave signal was reasonably analyzed on this basis. Secondly, wavelet threshold algorithm and fast independent component analysis were used to preprocess the zero-sequence current after the injection signal to achieve the effect of filtering noise and power frequency components. Finally, the generalized S-transform was applied to the preprocessed zero-sequence current signal to calculate the energy entropy of the generalized S-transform under the characteristic frequency of the injected signal, and the fault line was determined by comparing the entropy value. The simulation and on-site waveform verification results show that the proposed line selection method has strong applicability and reliability, can achieve accurate line selection under different working conditions, and has good anti-noise ability and high transition resistance ability.