文湖線161kV主變電站N-2轉供下22kV轉供電纜遮蔽層的風險評估

Risk Assessment on 22kV Load Transfer Cable Sheath Under N-2 of 161kV Main Substations for Wen-Hu Line

林信甫(Hisn-Fu Lin)

指導教授 ： 陳士麟

中原大學/電機資訊學院/電機工程研究所/碩士(2016年)

https://doi.org/10.6840/cycu201600797

摘要

台北捷運公司欲提高供電系統可靠度，擬將文湖線161kV主變電站的規劃準則由原本的N-1水準，提升至N-2水準，亦即當文湖線之文山分線兩座161kV主變電站停電，可由內湖分線主變電站轉供電力，或在內湖線主變電站停電時由文山線轉供。台北捷運公司於文山線延伸內湖線之建設時，已對兩分線間的22kV轉供電纜的線容作過評估，唯未對轉供期間該電纜遮蔽層耐壓或遮蔽層載流量予以評估。
本論文針對文湖線161kV主變電站N-2轉供下之22kV電纜遮蔽層耐壓及載流量進行評估。運用ATP暫態模擬軟體，模擬文山線兩座161kV主變電站停電，而由湖捷主變電站轉供復捷主變電站的轉供情況。針對現行遮蔽層單端接地而於另一端開路，探討於轉供期間情況下，兩分線之轉供電纜的遮蔽層耐壓，以EN50122標準及台電公司對161kV地下電纜人孔內之CCPU(Cable Cover Protection Unit)之規範相比較，確認不符合規範，建議22kV轉供電纜遮蔽層進行接地，經分析兩端接地模擬電流與遮蔽層安全載流容量相比較，依計算結果，建議轉供期間最大班距改為85秒。

關鍵字

文湖線；轉供；電纜遮蔽層；感應電壓；遮蔽層載流量

並列摘要

Taipei Rapid Transit Corporation (TRTC) plans to increase the power supply reliability of 161kV Bulk Supply Substation (BSS) of Wenhu Line by upgrading original N-1 to N-2 design criterion. The former refers to the power system design which allows the outage of one 161kV BSS and the latter allows the simultaneous outage of two BSS’s in the same Wenshan or Neihu Line. That is, under the outage of two BSS’s in the Wenshan Line, the closest BSS of Neihu Line must be able to supply power to Wenshan, and vice versa for the outage of Neihu and the power supply from Wenshan. Since the Neihu Line was planned as an extension to the Wenshan Line, TRTC has evaluated for the ampacity of the 22kV load transfer cables, but not for shielding layer pressure and ampacity of the cable sheath during power transferring.
The thesis focuses on evaluating shielding layer pressure and ampacity of 22kV load transfer cable sheath Under N-2 of 161kV Main
Substations for Wen-Hu Line. By using Alternative Transients Program, we simulate power outage of two 161kV BSSs in Wenshan Line, and power supply from the HUCHYEI BSS. We further discuss about the shielding layer pressure of load transfer cables of two Lines during load transfer period, especially the existing single-layer shielding grounded and the other end open. Based on EN50122 standard and standard of the 161kV underground cable manhole of CCPU (Cable Cover Protection Unit) of Taipower, the shielding layer pressure does not meet specifications. As a result, we recommend 22kV load transfer cables to ground. Comparing and analyzing the simulating two grounds current and the safe ampacity of shielding layer, according the calculation, suggest that the maximum headway is 85s during load transfer period .

並列關鍵字

Wen-Hu Line； Load Transfer； Shielding Layer Pressure； Shielding Layer Carrying Capacity

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