When concerning the installation and operation costs, it is always desirable to protect an overhead distribution network with a limited quantity of surge arresters (SAs). This paper presents a novel procedure for designing differentiated protection against lightning, by identifying appropriate positions for those SAs on the overhead line. Rather than the traditional flashover rate of a whole line, indices in terms of flashover numbers at individual poles and associated with possible stroke locations are introduced in this paper. Based on these flashover indices, a differentiated configuration of SAs can be identified using a selection strategy. After several rounds of selection, a differentiated SA protection scheme can be obtained, given by a pre-set quantity of SAs. In this procedure, a simplified probability-based approach is proposed to determine the flashover indices. By comparing the traditional Monte Carlo method, this approach can achieve a 10-fold increase in computational efficiency with reasonable accuracy. Two different selection strategies are introduced in this paper. Compared with the selection strategy using the flashover indices at individual poles, the selection strategy based on a group of poles is recommended because it yields a configuration with better lightning performance with the same quantity of SAs. This design procedure is applied to practical distribution networks with a shield wire and nearby structures. The influence of grounding impedance, a shield wire, and nearby structures is addressed. Finally, a generalized step-by-step procedure is provided to assist in a differentiated SA protection design.

中文翻译：

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配电网避雷器差异化配置的防雷保护


当考虑到安装和运营成本时，总是希望使用有限数量的电涌放电器 (SA) 来保护架空配电网络。本文提出了一种通过确定架空线路上这些 SA 的适当位置来设计差异化防雷保护的新颖程序。本文介绍的不是传统的整条线路的闪络率，而是各个极的闪络次数以及与可能的行程位置相关的指数。基于这些闪络指数，可以使用选择策略来识别 SA 的差异化配置。经过多轮选择，可以得到差异化的SA保护方案，由预先设定的SA数量给出。在此过程中，提出了一种基于概率的简化方法来确定闪络指数。与传统的蒙特卡罗方法相比，该方法可以在合理的精度下实现计算效率提高 10 倍。本文介绍了两种不同的选择策略。与基于单杆闪络指数的选择策略相比，基于一组杆的选择策略更值得推荐，因为它在相同SA数量的情况下产生了更好的防雷性能配置。该设计过程适用于具有屏蔽线和附近结构的实际配电网络。解决了接地阻抗、屏蔽线和附近结构的影响。最后，提供了通用的分步过程来帮助进行差异化的 SA 保护设计。