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

IF 3.3 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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引用次数: 0

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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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.