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Performance of Medium Voltage Overhead Distribution Lines Against Lightning Discharges

机译：中压架空配电线路抗雷电放电的性能

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The lightning discharges are one of the main causes of interruptions of medium voltage overheadrndistribution lines, being the reason of great concern for the utility companies. Its destructive effectsrnfrequently extends to equipments and connected installations, with the possibility to cause personalrninjuries and material damages, beyond economic losses, due to out of income and the possibility ofrnindemnities, penalties and fines.rnWith the beginning of the deregulation of the electric energy supply, some actions were been taken byrnthe utilities for the prevention and minimization of the damages associated to the lightning discharges.rnHowever, as the lightning discharges are random events, consequently, difficult to predict, thernmajority of these actions does not follow a study or a detailed analysis of the problem.rnBy this way, in the majority of the cases the actions were taken based on the knowledge of thernengineer in charge, or based in rules defined without any effective evidence, by means of studies or byrnlaboratory tests. As a result, many of them besides of presenting high cost are not effective.rnAmong others, the distribution network reliability depends directly on its exposition to the lightningrndischarges. To determine the exposition level of the line, the designer should know the number ofrndischarges to the ground per unit of area per unit of time.rnThe aim of this paper is to present the results of the performance study of medium voltage overheadrndistribution lines against lightning discharges, in the way to define methodologies to reduce the systemrnfailures.rnThe results were obtained within the partnership among the High Voltage Laboratory of the FederalrnUniversity of Itajuba, AES Sul Utility Company and the University of Bologna.rnDirect discharges and induced surges were simulated into real networks to identify the major factor ofrninfluence for network failures. Then commentaries on the relative performance and comparisons ofrndifferent construction configurations of overhead lines are presented.rnOnce that the atmospheric discharges phenomena are random, this work considers that the parameterrngeneration of the discharges follows the statistical data proposed by Anderson and Eriksson. ThernMonte Carlo Method is used for the incidence distribution of the discharges and the ElectrornGeometrical Model for the interception point of the discharge.
机译：雷电放电是中压架空配电线路中断的主要原因之一，是公用事业公司高度关注的原因。它的破坏性影响通常会扩展到设备和连接的设备，并可能由于收入不足以及可能遭受罚款，罚款和罚款而造成人身伤害和财产损失，而不是经济损失。随着对电能供应的放松管制的开始，公用事业公司采取了一些措施来防止和最大程度地减少与雷电放电有关的损害。但是，由于雷电放电是随机事件，因此，很难预测，这些措施的绝大多数并未经过研究或详细分析。通过这种方式，在大多数情况下，采取的措施是根据负责任的工程​​师的知识，或根据没有任何有效证据的定义的规则，通过研究或实验室测试得出的。结果，其中的许多方法除了成本高昂以外，都是无效的。其中，配电网的可靠性直接取决于其对雷电的影响。为了确定线路的暴露水平，设计人员应该知道单位时间内每单位面积对地面的放电数量。本文的目的是介绍中压架空配电线路抗雷电放电性能的研究结果。通过定义Itajuba联邦大学高压实验室，AES Sul公用事业公司和博洛尼亚大学之间的合作关系，获得了结果。rn将直接放电和感应浪涌模拟为真实网络以确定影响网络故障的主要因素。然后对架空线的不同性能和相对性能进行了评述。鉴于大气排放现象是随机的，这项工作认为排放参数的产生遵循了安德森和埃里克森提出的统计数据。 ThernMonte Carlo方法用于放电的入射分布，电子几何模型用于放电的拦截点。

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