本論文主要係以電磁暫態程式(EMTP)來模擬345kV及161kV電纜連接站遭受雷擊時，於電纜上所出現的暫態過電壓現象，並分析影響電纜電壓大小的原因，以提供最佳的保護效果。首先，本文依序建立雷擊突波、輸電線、輸電鐵塔、避雷器及輸電電纜等相關模型，以便於進行EMTP程式模擬；其次，針對雷擊至不同位置時，分析電纜連接站之避雷器接地線於不同引接方式下，電纜所承受之過電壓影響；並探討不同避雷器接地線長度與接地電阻值，對於電纜暫態過電壓之影響進行分析，以達到保護電纜絕緣之效果。根據研究結果顯示，電纜的絕緣保護效果與避雷器接地線之引接方式有關。尤其當避雷器接地線採用共同接地方式引接時，接地線長度的改變對於電纜導體電壓影響較明顯，而採用獨立接地方式引接時，減少接地電阻值將可有效降低導體電壓，並可避免地電位湧升造成遮蔽層銅線之電壓過高。

The main purpose of this thesis is to simulate the transient over-voltage on the 345kV and 161kV cable, while the lighting striking on the cable connection station by using the Electro-Magnetic Transients Program (EMTP). The feasibility of cable connection station to reduce the damage caused by lightning striking will also be conducted. In the process of the research, the components of the study system include lighting surge, transmission line, transmission tower, lightning surge, arrester, and cable are first modeled. Secondly, the voltage value in the cable will be analyzed by the different connection methods of ground wire, altering the length of the grounding wire of the arrester, and changing the value of the grounding resistance while the lighting striking on the different place. Simulation r4esults show that the voltage value be influenced by the grounding wire changed and reduction of the grounding resistance value can effectively decrease the over-voltage caused by lighting striking using the independent grounding method. The independent grounding also can avoid to exceed the metallic shield voltage caused by ground potential rise.

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