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題 名 | 地下電纜載流量之研究=The Study of Ampacities of a Single-Phase Buried Cable |
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作 者 | 江奕旋; | 書刊名 | 樹德學報 |
卷 期 | 21 1998.03[民87.03] |
頁 次 | 頁199-212 |
分類號 | 448.36 |
關鍵詞 | 有限元素法; 地下電纜; 纜溝; 電流載流量; Finite element method; Underground cable; Trench; Ampacity; |
語 文 | 中文(Chinese) |
中文摘要 | 由於路權之限制、及安全之考量與市容之美化等因素,配電線路進入市區後, 已逐步從架空方式改為地下埋設。但配電線路地下化所投資的工程費用比架空方式要昂貴 許多。因此,如何選擇適當的電纜規格及規劃最佳的埋設方式,以有效發揮電纜的功能, 避免造成過度的投資浪費,是線路規劃者必須重視的課題。 電纜周圍環境的熱散逸好壞影響其容量之大小,如:纜溝尺寸、電纜埋深、回填土種 類及周圍大氣溫度等因素,皆對其有程度不同之影響,本文採用有限元素法來分析這些因 素對直埋式單線地下電纜之載流量的影響。首先,以電纜絕緣耐溫之上限為依據,求出該 電纜系統之各節點溫度,再以熱流動率沿電纜之封閉路徑積分,求出電纜之可能最大熱輸 入率,以此分析電纜周圍環境對其載流量之影響。所分析之結果,可提供地下輸電系統規 劃人員作為參考,有助於改善直埋式電纜之施工方式,以節省成本,並提昇輸電效率。 |
英文摘要 | The ampacity is determined by the maximun temperature at which the insulation of the cable can be operated and, by the method of heat dissipation through the cable and its surroundings. The trench dimensions, soil properties and environmental conditions are the parameters that influence the heat dissipation from the cable and the ampacities of the cables systems. The evaluation of underground cable ampacity is the most important needs in power cable engineering and operation. This paper presents a study of the underground cable thermal field problem by using the finite element method. First, the maximum temperature at which the insulation of the cable can be operated is used for calculating the thermal distribution around the cable. Then, the maximum heat input rate will be calculated by integrating the heat flow rate along the boundary of the cable. The results given are useful for design of cable trench and the improving the effeciency of the underground transmission system. |
本系統中英文摘要資訊取自各篇刊載內容。