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首页> 外文期刊>Electric power systems research >Effect of a lossy dispersive ground on lightning overvoltages transferred to the low-voltage side of a single-phase distribution transformer
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Effect of a lossy dispersive ground on lightning overvoltages transferred to the low-voltage side of a single-phase distribution transformer

机译：有损分散接地对雷电过电压的影响，雷电过电压会传递到单相配电变压器的低压侧

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摘要

This paper presents a study of lightning overvoltages transferred to the low-voltage side of a 10 kVA 7.967 kV/240-120V single-phase distribution transformer considering dispersive ground effects in the medium-voltage distribution line terminated at its primary side. A two-port wideband model that is capable to represent the transformer behavior under different load conditions is considered. The medium voltage distribution line is modeled using Marti's transmission line model modified to include the variation with frequency of the ground resistivity and permittivity. Periodical grounding points are also modeled considering dispersive ground effects. Phase-neutral voltages transferred to the transformer secondary are calculated for direct lightning strikes at the medium-voltage line including insulation breakdown, surge arresters, and different load conditions. It is shown that the frequency variation of the ground resistivity and permittivity can significantly affect voltages transferred to the low-voltage side of the transformer if a high-resistivity soil is considered, depending on load conditions and on flashover occurrence. It is also shown that the importance of considering or neglecting frequency-dependent ground parameters on lightning overvoltages transferred to the secondary side of the transformer is minimized by the installation of a medium-voltage surge arrester at its primary side. (C) 2017 Elsevier B.V. All rights reserved.
机译：本文对转移到10 kVA 7.967 kV / 240-120V单相配电变压器的低压侧的雷电过电压进行了研究，考虑了终止于其初级侧的中压配电线路中的分散接地效应。考虑了一个能够代表不同负载条件下的变压器行为的两端口宽带模型。使用Marti的传输线模型对中压配电线进行建模，修改后的模型包括了接地电阻率和介电常数随频率的变化。还考虑了分散的地面效应对周期性接地点进行建模。计算传递到变压器次级的相中性电压是为了在中压线上产生直接雷击，包括绝缘击穿，电涌放电器和不同的负载条件。结果表明，如果考虑使用高电阻率土壤，则接地电阻率和介电常数的频率变化会严重影响传输到变压器低压侧的电压，具体取决于负载条件和发生的跳火。还表明，通过在变压器的初级侧安装中压电涌放电器，可以最小化考虑或忽略与频率相关的接地参数对转移到变压器次级侧的雷电过电压的重要性。 （C）2017 Elsevier B.V.保留所有权利。

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