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| Experimental Research on Ice － melting Characteristics of Power Through Line for Railway |
| SUN Jian － ming1，LIN Hao2 |
| 1． China Railway Siyuan Survey and Design Group Co． Ltd，Wuhan，Hubei 430063，China; 2． Electric Power Research Institute of State Grid，Wuhan，Hubei 430063，China |
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Abstract Research purposes: As the 10 kV power through line for railway is an overhead line with hybrid junction of cable，its conductor section is much less than the 110 kV power system and above． So it is necessary to do the research on its ice － melting characteristics for providing the basic data for the ice － melting scheme of 10 kV power through line．
Research conclusions: The research and test were done on the ice － melting characteristics of the power through line by using LGJ － 35、LGJ － 50 and LGJ － 70 three different types of steel reinforced cable and 10kV cross －linked cables of the same section area with simulation of the field environment in lab． The influences of the ice －melting current on the bearing ability of the power through line，ice － melting time and the de － iceing method are analyzed． It is concluded the optimum ice － melting currents of the railway 10kV power through lines of LGJ － 35，LGJ － 50 and LGJ － 70 are separately 175 A ～ 195 A，210 A ～ 240 A and 265A ～ 305A and the optimum ice －melting time varies from 1h to 2 h．
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Received: 09 June 2011
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2011, Vol. 28 
