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首页> 外文会议>2015 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies >Frequency spectrum characteristic analysis of single-phase ground fault in a Petersen-coil grounded system
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Frequency spectrum characteristic analysis of single-phase ground fault in a Petersen-coil grounded system

机译：Petersen线圈接地系统中单相接地故障的频谱特性分析

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This paper theoretically analyzes the frequency spectrum characteristics of the single-phase ground fault in a Petersen-coil grounded distribution network. Different equivalent circuits are analyzed for faults with low transition resistances and with high transition resistances, separately. The analysis concludes that the system makes a transition from an under-damped state to a damping state, and finally to another under-damped state with the increase of transition resistances. A distribution network model is built with PSCAD/EMTDC. Simulations are performed for different fault locations, different fault initial angles, different transition resistances and different cable proportions. The analysis in time domain and frequency domain is performed. Results show that the use of cables enables the main frequency of the fault current move towards lower frequency. Meanwhile, the amplitude of the fault current obviously increases due to the high capacitance to ground of cables. The transition resistance makes the biggest influence on the characteristic frequency band. Fault location mainly affects the zero sequence current main frequency amplitude. The further the fault location is away from the Bus, the little the amplitude of high-frequency component is. The transient capacitive current component increases, the transient inductive current component decreases and the high-frequency component amplitude increases with the increase of fault initial angles.
机译：本文从理论上分析了彼得森线圈接地配电网中单相接地故障的频谱特性。分别分析了不同的等效电路中的低过渡电阻和高过渡电阻故障。分析得出的结论是，随着过渡电阻的增加，系统会从欠阻尼状态过渡到阻尼状态，最后过渡到另一个欠阻尼状态。使用PSCAD / EMTDC构建了一个分销网络模型。针对不同的故障位置，不同的故障初始角度，不同的过渡电阻和不同的电缆比例执行仿真。进行时域和频域分析。结果表明，使用电缆可使故障电流的主频率向较低频率移动。同时，由于电缆对地的高电容，故障电流的幅度明显增加。过渡电阻对特征频带的影响最大。故障位置主要影响零序电流主频率幅值。故障位置离总线越远，高频分量的幅度就越小。随着故障初始角的增加，瞬态电容性电流分量增大，瞬态电感性电流分量减小，高频分量幅度增大。

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