基于暂态特性的配电网跨线路同相相继接地故障线路检测

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Yizhao Wang, Chuan Feng, Jian Liu, Xuan Dong, Jiawei Yuan, Zaibin Jiao
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引用次数: 0

摘要

目前,对小电流接地系统中单相接地(SPG)故障的理论分析已达到很高的水平,相应的检测方法也已成熟。然而,对连续接地(SG)故障的研究却严重不足,尤其是在消弧线圈接地系统中跨线同相连续接地(CSSG)故障的检测方面。为解决这些问题,我们提出了一种基于 CSSG 瞬态特性的新型故障线路检测方法。首先,建立了瞬态等效电路,并从理论上分析了瞬态零序电流(ZSC)的特性。其次,采用变异模态分解(VMD)从本征模态函数(IMF)中提取低频和高频信息。随后,提出了基于峰度理论和 Teager-Kaiser 能量算子(TKEO)的故障起始判据,该判据可准确检测二次故障的发生时间。最后,提出了一种基于交叉相关距离(CCD)和瞬态能量(TE)的故障线路检测方法。不同条件下的 PSCAD 仿真结果和现场测试结果肯定了分析的准确性和所提方法的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Faulty line detection for cross-line same-phase successive ground faults in distribution network based on transient characteristics

Faulty line detection for cross-line same-phase successive ground faults in distribution network based on transient characteristics

Currently, theoretical analysis of single-phase grounding (SPG) faults in low-current grounding systems has reached a high level of refinement, and the corresponding detection methods have matured. However, there is a significant lack of research on successive grounding (SG) faults, particularly in the area of detecting cross-line same-phase successive grounding (CSSG) faults in arc suppression coil grounding systems. To address these issues, a novel faulty line detection method based on transient characteristics of CSSG is proposed. Firstly, a transient equivalent circuit is established, and the characteristics of transient zero-sequence current (ZSC) are theoretically analysed. Secondly, variational mode decomposition (VMD) is employed to extract low and high-frequency information from intrinsic mode functions (IMFs). Subsequently, a fault initiation criterion based on kurtosis theory and the Teager-Kaiser energy operator (TKEO) is proposed, which can accurately detect the occurrence time of secondary faults. Finally, a method for faulty line detection based on cross-correlation distance (CCD) and transient energy (TE) is proposed. The results of PSCAD simulation under different conditions and field test affirm the accuracy of the analysis and the effectiveness of the proposed method.

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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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