Traveling wave based single-phase-to-ground protection method for power distribution system
Traveling wave based single-phase-to-ground protection method for power distribution system
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DOI：
10.17775/cseejpes.2015.00022
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发表时间：
2015-07
影响因子：
7.1
通讯作者：
Xinzhou Dong;Jun Wang;Shenxing Shi;Bin Wang;Bąk Dominik;Miles Redefern
中科院分区：
文献类型：
--
作者：
Xinzhou Dong;Jun Wang;Shenxing Shi;Bin Wang;Bąk Dominik;Miles Redefern
正确检测和识别配电系统中未有效接地的单相接地故障是保护工程师面临的主要挑战。本文提出了一种新的行波保护方法来解决这个问题。所提出的方法比较故障发生后立即测量的电流和电压行波的极性，以确定故障方向。利用母线上检测到的工频电压抑制运行，避免了自然跳闸。工频电压确保系统不会由于噪声而误操作，并且还提供相间和三相故障的区分。利用小波变换和模极大值理论提取继电保护点行波信号的极性。仿真研究表明，保护的正确操作，这是独立的故障距离，故障起始角，故障路径电阻，以及用于中性点接地的方法。
Correct detection and identification of single-phase to-ground faults not effectively grounded in distribution systems is a major challenge for protection engineers. This paper proposes a novel traveling wave based protection method to solve this problem. The proposed method compares the polarities of current and voltage traveling waves measured immediately after the fault inception to determine the fault direction. Nuisance tripping is avoided by using the power frequency voltages detected on the busbar to inhibit operation. The power frequency voltages ensure that the system does not mal-operate due to noise and also provide discrimination for phase-to-phase and three-phase faults. The wavelet transform and modulus maxima theories are used to extract the polarity of traveling waves measured at the relaying point. The simulation studies demonstrate correct operation of protection, which is independent of fault distance, fault inception angle, fault path resistance, and the method used for neutral grounding.