【摘要】 为分析馈线自身的不平衡对单相高阻接地故障暂态特征的影响，建立一种包含多个馈线不平衡电压源的单相接地故障等值电路，单条馈线的不平衡电压源的幅值和相位只与该条馈线的固有对地不平衡度有关，而暂态故障电流特征的显著程度与过渡电阻的大小相关。提出基于状态空间的故障过渡电阻辨识方法，利用线性回归的方法辨识得到单相接地故障电阻从故障发生时刻起，会从一个较大的值逐步降低，而影响故障暂态特征显著程度的初始电阻往往较大，这可能导致故障后的馈线暂态电流与固有电流的幅值之间无显著差异，馈线的固有不平衡将严重影响基于暂态特征进行选线的方法准确性。更多还原

【Abstract】 To analyze the impact of feeder imbalance on the transient characteristics of single-phase high-impedance grounded faults, this paper establishes an equivalent circuit for single-phase grounded faults that includes multiple feeder imbalance voltage sources. The magnitude and phase of the unbalanced voltage source of a single feeder are only related to the inherent ground imbalance of that feeder, while the significance of the transient fault current characteristics is related to the size of the transition resistance. A state-space-based fault transition resistance identification method is proposed, and linear regression is used to identify the single-phase ground fault resistance. From the moment the fault occurs, it will gradually decrease from a larger value. The initial resistance that affects the significant degree of fault transient characteristics is often large, which may cause no significant difference between the amplitude of the feeder transient current and the inherent current after the fault. The inherent imbalance of the feeder will seriously affect the accuracy of using transient characteristics for line selection.更多还原