架空輸電線路建模及雷害防治對策

吳建澄

doi:10.6841/NTUT.2010.00496

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架空輸電線路建模及雷害防治對策

Overhead Transmission Line Modeling and Lightning Damage Prevention Countermeasure

吳建澄 , Masters　　Advisor：王順源;曾傳蘆　　

繁體中文 DOI： 10.6841/NTUT.2010.00496

架空輸電線路；線路模型；逆閃絡；遮蔽失敗； Overhead Transmission Line ； Transmission Line Model ； Backflashover ； Shielding Failure Flashover

Abstract │ Reference (21) │ Altmetrics

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The thesis is devoted to the study on overhead transmission line modeling and related lightning damage prevention. First, by using the Tflash software, the transmission line model with the same parameters is built. Consequently, this research adopts different lightning prevention methods, such as reducing grounding resistance, increasing insulation strength, and installing line arresters to analyze lightning strikes characteristics. Moreover, we use the parameters of 69 kV overhead transmission lines, which are deployed at Taiwan Power Company’s Hsinchu- Jhudong and Longshuei-Jhudong sections, to establish a practical model. This model linking up with different lightning prevention methods can analyze the probability of lightning flashover. 
	From the lightning strikes characteristics, we observe that if the grounding resistance is reduced, the tower-foot voltage is reduced accordingly during the lightning strikes. No significant effects are found while the lightning strikes on the conductor. Also, increasing insulation strength increases the value of maximum flashover voltage and reduces the backflashover. In addition, the installation of line arresters improves significantly the rise of tower voltage when the lightning strikes.	From the simulation of the probability of lightning flashover, it shows that when the transmission line grounding resistance is less than 10 Ω, the effect of which reducing grounding resistance to improve lightning damage is insignificant. There are significant improvements in backflashover and shielding failure flashover by increasing the insulation strength. If the arrester is installed on the incorrect location, the probability of flashover of other towers will increase. Installing line arresters thoroughly obtains the best performance if no budget limit. However, the installation cost increases tremendously since the arresters are expensive. The effect of arrester installation on the flashover of other towers can be simulated using the proposed method and the locations of arresters can be found to get the compromise between the installation cost and flashover influence.

Reference ( 21 ) 〈TOP〉

[2] IEEE STD 1243-1997, IEEE Guide for Improving the Lightning Performance of Transmission Lines , IEEEE Power Engineering Society, 26, June 1997.
連結：
[1] EPRI, Handbook for Improving Overhead Transmission Line Lightning Performance, December 2004.
[3] 輸電工程手冊，台灣電力公司輸變電工程處。
[4] 架空線路設計準則，台灣電力公司，96年4月10日。
[5] 線路絕緣設計標準，台灣電力公司，87年10月2日。

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