Study on the Grounding Mode of 10kV Single Conductor Cables on the Passenger Dedicated Lines
LI Wen-hao1, CUI Xiao-yu1, CHEN Wei-rong2, LIN De-fu1
1. The Third Railway Survey & Design Institute Group Corporation, Tianjin 300251, China; 2. Southwest Jiaotong University, Chengdu, Sichuan 610031, China
Abstract：Research purposes：Single high-voltage conductor cables are used for most of the 10kV power run-through line in the construction of Shijiazhuang-Taiyuan Passenger Dedicated Line (PDL). Considering the effects of different electric loops along the electrified railways, the studies were done on the induced voltages of the metallic sheath in single-phase and three-phase circuits. According to the requirement of GB50217-2007, the induced voltage in the metallic sheath of the single conductor cable was calculated. After analyzing and comparing the different grounding methods, the solution was proposed to the layout of the single conductor cables and the grounding of the metallic sheath.
Research conclusions：Single conductor cables in 10kV power run-through lines are better to be arranged as an equilateral triangle. The effect of catenary currents should not be neglected when calculating the induced voltage of the metallic sheath. The two ends of the metallic sheath in the single conductor cable shall not be earthed directly. For the cable length up to 2 km, it is grounded with one end direct earthing and the other end protective earthing. Middle direct grounding-two ends protective grounding method can be adopted if the cable length is about between 2 km and 4 km. Metallic sheath cross connection method is advised when the cable length is longer than 4 km.
李文豪，崔校玉，陈维荣，林德福. 客运专线10 KV单芯电缆接地方式的研究[J]. 铁道工程学报, 2009, 26(4): 39-42.
LI Wen-hao, CUI Xiao-yu, CHEN Wei-rong, LIN De-fu. Study on the Grounding Mode of 10kV Single Conductor Cables on the Passenger Dedicated Lines. 铁道工程学报, 2009, 26(4): 39-42.
2009, Vol. 26 
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