因應北部核一、核二、協和等電廠穩定電源陸續除役，為解決未來台灣地區用電缺口及配合政府再生能源政策，台電公司規劃於2025年提供6.5GW併網容量予彰化離岸風力業者，而需配合新建彰工～彰濱345kV線，將離岸電力併入台電公司電力網。該新建線路位於彰化濱海工業區內，由彰工升壓站引接至彰濱E/S，因濱海地區鐵塔鹽害銹蝕問題，故配合鐵塔維護更換而開發了寬型鐵塔。台電公司輸電鐵塔的設計規範均係採風力設計，一般認為地震力對於鐵塔的影響較小，在民國88年921大地震後，為確保輸電鐵塔之結構安全，台電公司民國89年委託中華民國結構工程學會就鐵塔結構做耐震設計研究，雖結論顯示輸電鐵塔具有一定安全性，但在部分停電事故時，鐵塔耐震問題仍經常遭受大眾質疑。本研究採用MIDAS結構分析程式就WD5寬型鐵塔之耐震能力進行深入探討，除以台電材料規範、鋼結構設計規範(包含容許應力設計法及極限設計法)，以及桿件斷面實際應力等方式對鐵塔進行耐震能力之安全檢核外，並深入探求寬型鐵塔之耐震程度，以確保鐵塔結構之安全，進而維護台電公司輸電系統電力輸送之穩定性。

In light of the gradual decommissioning of stable power sources such as Taiwan’s First Nuclear Power Plant, Second Nuclear Power Plant, and Hsieh-ho Power Plant, the Taiwan Power Company (Taipower) plans to deploy 6.5GW of grid-connected capacity for offshore wind farm operators in Changhua by 2025, so as to cope with Taiwan’s future electricity consumption gap and to stay in line with the government’s policies on renewable energy. The project will require the construction of 345kV lines from Changgong to Changbin and the integration of offshore power into Taipower’s grid system. The proposed power lines are located inside the Changhua Coastal Industrial Park (also referred to as Changbin), and extend from the Changbin Extra-High Voltage Substation to the Changgong Booster Station. Due to the problem of salt corrosion in steel transmission towers in coastal areas, wide-type transmission towers have been developed to facilitate tower maintenance and replacement. Based on the load combinations of the design specifications, the design force of Taipower’s transmission towers is generally dominated by the wind forces and seismic forces are regarded to have less impact on transmission towers. In the wake of the 1999 Jiji earthquake, Taipower commissioned the Chinese Society of Structural Engineering (CSSE) to examine the structural quality of its transmission towers in terms of withstanding earthquakes, so as to verify their structural safety. Even though CSSE’s results showed that the towers’ design accorded them a certain degree of safety, the seismic resistance of the towers is often raised as a public concern following the occurrence of partial power outages. This study used the MIDAS structural analysis software to perform in-depth investigations on the seismic resistance of the WD5 wide-type transmission tower. In addition to performing safety assessments of the seismic resistance of the towers based on standards such as Taipower’s material specifications, design specifications of steel structures (including allowable strength design and ultimate strength design methods), and the actual stress experienced by the cross section of a member, the resistance of the WD5 wide-type transmission towers was also investigated thoroughly, so as to ensure the structural safety of the towers and, thereby, maintain the stability of Taipower’s power supply systems.

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