覆冰不平衡张力计算分析  

Calculation and Analysis of the Unbalanced Tension Caused by Icing

作　　者：程思勇[1] 薛志方[1] 

机构地区：[1]广西电力工业勘察设计研究院,广西南宁530012

出　　处：《电网与清洁能源》2011年第2期10-13,共4页Power System and Clean Energy

基　　金：广西电力设计院和重庆大学合作项目(PJ08002)

摘　　要：为计算输电线路不均匀覆冰后所产生的不平衡张力,并分析各种线路参数对其产生的影响以便为覆冰设计提供指导。根据耐张段内串偏移量及档距变化量建立非线性方程组,采用牛顿法求解输电线路不均匀覆冰所产生的不平衡张力并分析了线路各种参数对其产生的影响。大量计算表明:增大导地线安全系数能增大不平衡张力;增加悬垂串串长和减小高差能有效减小覆冰时的不平衡张力;档距分布不均将有利于减小不均匀覆冰时的不平衡张力;适当增加耐张段内的档距数,覆冰不平衡张力将得到明显改善。This paper serves to calculate the unbalanced tension caused by icing, to analyze effects of different transmission parameters on it, and therefore to provide guidelines for the anti-icing design. Nonlinear equations are established according to the string offset and the span variations in one tension segment to compute the unbalanced tension on the transmission line caused by icing and to analyze the effects of different line parameters on the tension. Calculations indicate that the larger safety factor of conductors, the larger unbalanced tension becomes; increasing the length of suspension insulator string and decreasing the height between towers can effectively reduce the unbalanced tension; the more uniform span distribution under the uneven ice circumstance, the lower unbalance tension;and the unbalanced tension decreases considerably if we increase the number of spans in the tension segment.

关 键 词：输电线路 不平衡张力 线路参数 非线性方程组 档距 

分 类 号：TM75[电气工程—电力系统及自动化] O39[理学—工程力学]