ANALYSIS OF LIGHTNING DATA FOR BACK FLASHOVER PREVENTION IN 69 KV OVERHEAD TRANSMISSION LINE IN TAIWAN

Chien-Kuo Chang ； Hung-Yu Ke ； Ruay-Nan Wu

《技術學刊》 37卷2期 (2022/06) Pp. 137-148

摘要

Mostly the design of the lightning protection of transmission lines does not refer to the lightning record of the surrounding environment. This study uses the data of a total lightning detection system to improve the lightning protection of 69 kV overhead transmission lines in Taiwan. In this study, two sections of such transmission lines in a high-frequency lightning strike area were selected to build a simulation model. The electromagnetic transient of lightning strikes on the ground wire and the cross-arms of a tower were simulated using the T-Flash software. The insulation strengths of the lightning prevention were proposed by affording 95% cumulative probability of the lightning current. The result showed that the success rate of lightning protection improved from 51.6% to 95%. The proposed method can identify and improve existing high-risk lines as well as confirm the safety of new circuits.

關鍵字

overhead transmission line ； lightning detection system ； back flashover ； statistical analysis

參考文獻

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