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Lightning Overvoltage Protection of Step-Up Transformer Inside a Nacelle of Onshore New-Generation Wind Turbines

机译:在陆上新一代风力涡轮机的机舱内升压变压器的避雷过电压保护

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摘要

This paper presents an electromagnetic transient analysis of lightning-initiated overvoltage stresses of the step-up transformers installed inside a nacelle of onshore, multi-megawatt, new-generation wind turbines. The increase in the wind turbine (WT) nominal power output, necessitated introducing the step-up transformer into the nacelle. A transformer installed inside a nacelle is subjected to completely different overvoltage stresses from those present if it were installed at the base of the WT tower. This has serious repercussions on its overvoltage protection (i.e., selection and installation of surge arresters) and insulation coordination. Furthermore, the overvoltage protection of medium-voltage cables (inside the tower) is also problematic when considering their length, proximity to the tower wall, and their screen grounding practices, and needs to be tackled in conjunction with that of the step-up transformer. This paper presents detailed models for the various components of the latest-generation WTs, intended for fast-front transient analysis and assembled within the EMTP software package. We further present the comprehensive results of the lightning-transient numerical simulations, covering both upward and downward (first and subsequent) strikes, their analysis, and recommendations for the optimal selection of medium-voltage surge arresters for the step-up transformers installed inside a nacelle.
机译:本文介绍了安装在陆上陆上,多兆瓦,新一代风力涡轮机内的机舱内的升压变压器的闪电过电压应力的电磁瞬态分析。风力涡轮机(WT)标称功率输出的增加,需要将升压变压器引入机舱。如果安装在机舱内的变压器,则在WT塔的底部安装完全不同的过电压应力。这对其过压保护具有严重影响(即,选择和安装电涌避雷器)和绝缘协调。此外,当在考虑其长度,塔架壁的长度和屏幕接地实践时,中压电缆(塔内)的过电压保护也是有问题的,并且需要与升压变压器的长度结合使用。本文介绍了最新一代WT的各种组件的详细型号,用于快速前进的瞬态分析并在EMTP软件包中组装。我们进一步提出了闪电瞬态数值模拟的综合结果,涵盖了向上和向下(第一和后续)罢工,分析和建议,为安装在A内的升压变压器的中压避雷器的最佳选择机舱。

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