電纜的送電容量主要決定於電纜導體的最高容許溫度及地中之基底溫度,尤其是地中的基底溫度,若能於電纜之各種運轉情況下,均可將其經常維持恆定,也就是將電纜所產生的熱量均能有效排除的話,則不但可抑制地中基底溫度的上昇,更可大幅度的增加電纜的送電容量。在繁華的市區中,由於負載密集,特別需要靠電纜輸送較大的電力,因此若能提供電纜最佳的散熱途徑,有效降低其佈設環境的溫度,則可提高其送電容量,以因應負載的需求。 台電於五輸及六輸輸電計劃中,為提高送電容量而採用161kV XLPE電力電纜,其中又以2000mm²為主要之設計重點,有鑑於此,本論文乃針對國內現今佈設於管路及洞道中之161kV XLPE電力電纜,提出並分析佈設環境溫度變化對電纜送電容量之影響情形,期能對提升舊有線路及新設計線路之送電容量有所助益。
The transmission capacity of cables depends on the allowed maximum temperature of conductors and underground temperature. If the underground temperature can be maintained to be stable, that is, the heat energy produced by cables operation can be efficiently expelled, the capacity of electricity transmission can be increased. In the busier downtown where the power loading is much higher and needs huge power energy from power cables, it is more necessary to reduce the environmental temperature to offer more electricity. This paper studies the current installation layout of 161kV XLPE(Cross-linked Polyethylene) power cables which 2000mm² is the major point design to upgrade transmission capacity in Taiwan Power Company’s Fifth and Sixth Power Transmission Projects to submit some suggestion to upgrade the transmission capacity of earlier layouts and new designed ones.