输电线路综合荷载等值覆冰厚度预测与试验研究  

Prediction and Experimental Study on Combined Load Equivalent Ice Thickness of Overhead Transmission Line

作　　者：蒋兴良[1] 常恒[1] 胡琴[1] 胡建林[1] 张志劲[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044

出　　处：《中国电机工程学报》2013年第10期177-183,3,共7页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划(973计划)(2009CB724501);国家创新研究群体基金(51021005)~~

摘　　要：输电线路覆冰后,将引发断线倒塔事故,严重威胁电网的安全运行,在线监测导线覆冰情况具有重要的工程应用价值。为了实现实时监测输电线路的等值冰厚,提出了以静力学力矩平衡为理论依据的架空输电线路综合荷载等值覆冰厚度预测模型。该模型以轴向拉力和倾角为参数,考虑了耐张绝缘子串带来的不均匀载荷,以及风力带来的风偏平面内综合荷载增加等影响。在试验站开展现场导线覆冰的测量,进行现场试验验证。结果表明:利用该文提出的预测模型计算出的综合荷载等值冰厚和人工测得的现场导线等值冰厚吻合较好,验证了该模型的精确性。基于现场试验经验,提出了用于现场测量的覆冰形状校正系数,为进行现场输电线路覆冰测量提供一种有效和简便的测量手段。Accidents such as break line and tower collapse caused by heavy icing bring great threat to safety and stability performance of the power systems. Therefore, online- monitoring on icing for transmission lines can provide valuable reference for engineering applications. In order to monitor equivalent ice thickness, a prediction model of combined load equivalent ice thickness based on torque balance theory was established. This model takes axial tension and angle as parameters and considers unequal loading due to strain insulator string as well as increase of combined load caused by wind force. Manual measurement of icing thickness was carried out in observation station. The field test results show that the prediction obtained by this model is in accord with manual measurement data pretty well. Therefore, the accuracy of this model is verified. Based on field test experience, correct factor of ice shape was presented to provide an accurate and convenient measurement method for field icing measurement.

关 键 词：覆冰 架空输电线路 拉力 倾角 预测模型 冰形校正系数 

分 类 号：TM75[电气工程—电力系统及自动化]