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首页> 外文期刊>Electric power systems research >Single line-to-ground fault location based on unsynchronized phasors in automated ungrounded distribution systems
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Single line-to-ground fault location based on unsynchronized phasors in automated ungrounded distribution systems

机译：自动不接地配电系统中基于不同步相量的单线接地故障定位

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摘要

This paper proposes a new method for locating single line-to-ground (SLG) faults in ungrounded distribution systems. A distribution automation system is required to obtain all the required information from feeder remote terminal units via a communication channel with unpredictable time delays. Before locating a SLG fault, the faulted section is identified based on the absolute difference between the approximate zero-sequence angles of two adjacent nodes. Fault location starts by obtaining the synchronized zero-sequence voltage and current at the faulted node. This is achieved by forward calculation from the zero-sequence voltage and current at the substation. Because the zero-sequence current at the faulted node is calculated in synchronization with the substation, the other phasors at the faulted node are synchronized by phase compensation based on the phase difference between the synchronized and measured phasors corresponding to the zero-sequence current. Using the synchronized phasors, the fault location is identified through application of an orthogonal operator to the voltage equation at the faulted node. The performance of the proposed algorithm was evaluated using fault signals generated by the EMTP. The simulation results confirmed the validity and efficiency of the proposed algorithm for locating SLG faults in ungrounded distribution systems.
机译：本文提出了一种定位不接地配电系统中单线接地故障的新方法。需要配电自动化系统，以不可预测的时间延迟通过通信信道从馈线远程终端单元获取所有所需信息。在定位SLG故障之前，根据两个相邻节点的近似零序角度之间的绝对差来确定故障区域。通过获取故障节点上的同步零序电压和电流来开始故障定位。这是通过从变电站的零序电压和电流进行正向计算来实现的。由于故障节点处的零序电流是与变电站同步计算的，因此故障节点处的其他相量将根据与零序电流相对应的同步相量和测量相量之间的相位差通过相位补偿进行同步。使用同步相量，通过对故障节点处的电压方程应用正交算子来确定故障位置。使用由EMTP生成的故障信号评估了所提出算法的性能。仿真结果证实了该算法在不接地配电系统中定位SLG故障的有效性和有效性。

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