Equivalent Circuit Model of a Transmission Tower Considering a Lightning Struck Point and Cross-arms
Equivalent Circuit Model of a Transmission Tower Considering a Lightning Struck Point and Cross-arms
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DOI：
10.1016/j.epsr.2021.107253
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发表时间：
2021-07
影响因子：
3.9
通讯作者：
Akifumi Yamanaka;N. Nagaoka;Y. Baba
中科院分区：
文献类型：
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作者：
Akifumi Yamanaka;N. Nagaoka;Y. Baba
研究了雷击杆塔顶端横担时垂直双回输电塔绝缘子上产生的电压，提出了考虑横担的杆塔电路分析模型。当雷击塔顶横担顶端时，雷击侧绝缘子的电压高于另一侧绝缘子的电压。这是因为电磁场在被撞击的一侧更强，而在另一侧减弱。电压差会对反向闪络的发生产生影响。现有的输电塔等值电路大多没有考虑雷击侧电磁场或其合成电压的差异。本文提出了一种新的电磁暂态模拟器的等效电路模型，该模型可以考虑雷击侧电压的差异。通过比较本文中使用FDTD方法计算的绝缘子电压波形和过去在实际特高压输电塔上测量的绝缘子电压波形，证实了所提出的等效电路模型的有效性。
This paper studies voltages generated across the insulators of a vertical double-circuit transmission tower due to a lightning strike to a tip of the tower top cross-arm, and presents a circuit analysis model of the tower considering the cross-arms. When lightning strikes the tip of tower top cross-arm, insulator voltages on the lightning-struck side are higher than those on the other side. This is because the electromagnetic field is more intense on the struck-side and it is weakened on the other side. The voltage difference can have an effect on the back-flashover occurrence. Most of existing equivalent circuits of transmission tower cannot consider the difference of electromagnetic field or its resultant voltages depending on the side of lightning strike. Here, a new equivalent circuit model, which can consider the difference of voltages depending on the side of lightning strike, is proposed for electromagnetic transient simulators. The validity of the proposed equivalent circuit model is confirmed by comparing waveforms of insulator voltages computed using the FDTD method in this paper and those measured on an actual ultra-high voltage transmission tower in the past.