基于有源消弧暂态衰减信息的配电网接地故障跟踪检测方法

Ground Fault Tracking and Detection of Distribution Network Based on Transient Attenuation Information of Active Arc-suppression Process

现有配电网单相接地故障检测技术缺乏消弧过程的故障程度跟踪与选线能力。该文充分利用消弧过程中的暂态信息,建立考虑线路参数不对称的集总参数等效模型,论证消弧过程零序电压衰减直流特征的物理意义,提出考虑快速消弧的配电网故障检测新方法,对于低、高阻接地故障均有较高的检测灵敏度。实际应用中,仅需观测消弧全补偿电流投切过程中零序电压及零序电流波形,即可实现过渡电阻测量、故障程度跟踪与故障选线,具有瞬时性故障实时跟踪、故障检测与故障消弧同步进行的优势,操作简单、易于实现。仿真实验证实了方法的有效性,为配电网故障检测提供了新的理论依据。

The existing single-phase grounding fault detection technologies lack the ability of fault degree tracking and line selection during arc suppression process in distribution network.Making full use of the transient information during arc suppression process,the lumped parameter equivalent model considering line parameter asymmetry is established,the physical significance of attenuation characteristics of zero sequence voltage in arc suppression process is demonstrated,and a new fault detection method for distribution network considering fast arc suppression is proposed,which is highly sensitive to the detection of both low and high resistance grounding fault.Fault resistance measurement,fault degree tracking and fault line selection can be realized by observing the waveform of zero sequence voltage and current during the switching process of arc suppression full compensation in actual application.It is easy to operate and complete.The effectiveness of the method is verified by simulation experiments,which provides a new theoretical basis for ground fault detection of distribution network.