配电线路励磁涌流自适应闭锁方案

doi:10.19595/j.cnki.1000-6753.tces.180668

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Abstract In distribution lines, the characteristics of magnetizing inrush current may be covered by sine signals so that it cannot be reliably recognized. Besides, line protection may also be incorrectly blocked when inrush current and fault current exist together. Aiming at these problems, this paper proposes an adaptive blocking scheme for inrush current in distribution lines. Firstly, the wavelet transform is utilized to divide line current signal waveform into inrush sections and sine sections, and the least squares method is used to calculate the amplitude and phase angle of each section. And then, the smallest sections in per cycle are evaluated to examine if them meet the action criterion of line protection. Finally, according to the evaluation result, line operating condition is judged so as to determine whether to block line protection. Not only is the proposed scheme able to reliably block inrush current in normal operating condition, but also it will not incorrectly block line protection when inrush current and fault current exist together, which realize the adaptive blocking technique. The proposed scheme does not need to further set other thresholds. In addition, it does not require voltage information. Therefore, it is convenient for the implementation in the actual project. The validity and reliability of the proposed scheme have been verified by simulation tests and field recorded data tests.

Key words： Distribution line magnetizing inrush current wavelet transform least squares method adaptive blocking

Received: 23 April 2018 Published: 14 June 2019

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TM773

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	Liu Penghui
	Huang Chun
	Shi Yanxiang
	Wang Yonghong
	Lei Yiteng

Cite this article:

Liu Penghui,Huang Chun,Shi Yanxiang等. An Adaptive Blocking Scheme for Magnetizing Inrush Current in Distribution Lines[J]. Transactions of China Electrotechnical Society, 2019, 34(11): 2395-2414.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180668 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I11/2395

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