Clarifying the conditions under which the LEMP significantly affects lightning flashover rates of medium-voltage distribution lines

IF 4.2 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Electric Power Systems Research Pub Date : 2025-02-12 DOI:10.1016/j.epsr.2025.111515

Akifumi Yamanaka, Kazuyuki Ishimoto

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Abstract

Lightning strikes on distribution lines can disrupt the operation of electric power systems, and hence it is crucial to accurately estimate the lightning performance by comparing various protection strategies. Recent studies have shown that the lightning electromagnetic pulses (LEMPs), which generate lightning-induced voltages in distribution lines, have a significant impact on the overvoltages generated even by direct strikes. This study aimed to clarify the conditions under which the LEMP significantly affects flashover rates (FORs) because considering the LEMP for direct lightning surge analysis requires additional calculations for electromagnetic transient analysis. We evaluated the LEMP impact on the FORs by considering the parameters as follows: soil resistivity (grounding resistance), intervals of surge arresters (SAs), and critical flashover voltages (CFOs). The analyses clarified that the LEMP impact is significant for lines with a coarse interval of SAs and low soil resistivity; this trend is emphasized by a high CFO. The impact is insignificant for lines with a close interval of SAs or a high resistivity. Although considering the LEMP impact is important for performing an accurate analysis, it can be neglected in the latter conditions, facilitating an efficient lightning performance assessment of distribution lines taking account of various protection strategies.

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阐明了LEMP显著影响中压配电线路雷电闪络率的条件

雷电对配电线路的影响会破坏电力系统的正常运行，因此通过比较各种保护策略来准确估计配电线路的雷电性能至关重要。近年来的研究表明，在配电线路中产生雷击电压的雷电电磁脉冲（LEMPs），即使是直接击中也会对产生过电压产生重大影响。本研究旨在阐明在何种条件下LEMP会显著影响闪络率（FORs），因为考虑LEMP用于直击雷击浪涌分析需要额外的电磁瞬变分析计算。我们通过考虑以下参数来评估LEMP对FORs的影响：土壤电阻率（接地电阻）、避雷器间隔（SAs）和临界闪络电压（cfo）。分析表明，LEMP对土壤电阻率较低的土壤电阻率较粗的土壤土壤的影响较大；高财务总监强调了这一趋势。对于sa间隔较近或电阻率较高的线路，影响不大。尽管考虑LEMP影响对于进行准确的分析很重要，但在后一种情况下可以忽略它，从而促进考虑各种保护策略的配电线路的有效防雷性能评估。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.