Electrodynamic forces affecting lightning protection system components and structures

2016 33rd International Conference on Lightning Protection (ICLP) Pub Date : 2016-09-01 DOI:10.1109/ICLP.2016.7791443

Volodymyr Shostak, Mikhailo Sypchenko, Thomas Smatloch

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Abstract

Electrodynamic (ED) forces influencing upon lightning protection (LP) components in some typical LP system configurations and conditions are studied. These include: various angles between conductors, their finite lengths, round and flat bar cross-section, grid of conductors, various heights of conductor holders, placement of conductors above metallic cladding and reinforced concrete, various materials, etc. Some practical formulas and examples (grid; conductor going from roof to wall and other) are included, and the scale of stresses affecting the components is discussed. For various current magnitudes and waveforms according to [1], ED forces are estimated by analytical formulas and numerical simulation. In typical LP components, stresses may reach a few units, tens and up to ~180 kN/m, for maximal currents corresponding to LPL 1. For some fastening elements (screws, expansion anchors), the critical levels of current magnitudes (tens of kiloamperes), which able to pull out holders from typical base materials (wood, concrete/brick), are determined. Results are discussed and recommendations provided.

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影响防雷系统部件和结构的电动力

研究了几种典型防雷系统配置和条件下，电动力对防雷元件的影响。这些包括:导体之间的各种角度，它们的有限长度，圆形和扁平的横截面，导体的网格，导体支架的各种高度，导体在金属包层和钢筋混凝土之上的放置，各种材料等。一些实用的公式和例子(网格;包括从顶板到顶板的导体和其他)，并讨论了影响元件的应力尺度。对于根据[1]的各种电流大小和波形，通过解析公式和数值模拟来估计ED力。在典型的低压元件中，对于LPL 1对应的最大电流，应力可能达到几个单位，几十个单位，甚至高达~180 kN/m。对于某些紧固元件(螺丝，膨胀锚)，确定了能够从典型基础材料(木材，混凝土/砖)中拔出支架的电流大小的临界水平(数十千安)。讨论了结果并提出了建议。

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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2016 33rd International Conference on Lightning Protection (ICLP)

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