Accurate Flashover assessment for coastal overhead lines based on volt-time criterion

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Electric Power Systems Research Pub Date : 2024-11-23 DOI:10.1016/j.epsr.2024.111257

Amin Foroughi Nematollahi, Behrooz Vahidi

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Abstract

This study investigates the impact of considering insulation volt-time curves on estimating the annual flashover rate of overhead lines subjected to nearby lightning strikes in the presence of ocean-land environments. A method based on the

3 D

Finite Element Method is employed to compute induced voltages, while a Monte Carlo simulation determines the annual flashover occurrence. To detect Flashover occurrence a volt-time method is employed and the results are compared with the conventional

1.5 C F O

criterion. The influence of line proximity to the coastline, pole spacing, and various striking distance calculation methods on flashover predictions is evaluated. Results indicate that the

1.5 C F O

criterion underestimates the annual flashover rate due to indirect lightning in mixed ocean-land terrains compared to the volt-time curve approach. A novel analytical formula is proposed to estimate annual flashovers considering volt-time curves in such environments.

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基于伏特-时间准则的沿海架空线路精确闪络评估

本研究探讨了在海洋-陆地环境下，考虑绝缘电压-时间曲线对估算附近遭受雷击的架空线路年闪络率的影响。采用基于三维有限元法的方法计算感应电压，并通过蒙特卡罗模拟确定年闪络发生率。为了检测闪络的发生，采用了伏特时间法，并将结果与传统的 1.5CFO 标准进行了比较。评估了线路与海岸线的距离、电杆间距以及各种冲击距离计算方法对闪络预测的影响。结果表明，与伏特-时间曲线法相比，1.5CFO 标准低估了海洋-陆地混合地形中间接闪电引起的年闪络率。提出了一种新的分析公式，用于估算在这种环境下考虑伏-时曲线的年闪络率。

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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.