微地形区OPGW地线不均匀覆冰计算模型改进方法  

Research on the Improvement Method of OPGW Ground Uneven Icing Calculation Model under Micro-terrain

作　　者：朱永灿[1] 舒新 田毅[1,2] 谢松林 张烨 刘宇鹏[1] ZHU Yongcan;SHU Xin;TIAN Yi;XIE Songlin;ZHANG Ye;LIU Yupeng(College of Electronics and Information,Xi’an Polytechnic University,Xi’an 710048,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安工程大学电子信息学院,陕西西安710048 [2]电力设备电气绝缘国家重点实验室(西安交通大学),陕西西安710049

出　　处：《中国电力》2023年第3期55-63,共9页Electric Power

基　　金：陕西省重点研发计划资助项目(2021GY-306);陕西省创新能力支撑计划-陕西省青年科技新星项目(2022KJXX-41);陕西省自然科学基础研究计划(2022JQ-568)。

摘　　要：目前对均匀覆冰下架空线等值覆冰厚度计算模型的研究较多,但缺少对大截面、大单位长度重量的地线复合光缆(optical pilot ground wire,OPGW)地线覆冰的研究,特别是在微地形下等值冰厚计算模型的适用性。选取大档距大高差工况,通过有限元软件建立3种典型地形(山坡、山顶、垭口)下的3塔两档OPGW地线模型,结合考虑绝缘子串偏斜角的等值冰厚模型,对传统输电线路等值覆冰厚度模型进行误差分析,结果发现等值冰厚较小时大档薄覆冰情况下的传统冰厚计算误差较大。但随着平均等值冰厚增大,冰厚计算误差显著减小。利用以上分析结果和平均等值冰厚与绝缘子串轴向拉力与倾角的函数关系,提出一种冰厚误差优化计算方法,改进后的冰厚相对误差能控制在10%以内。At present,there are many studies on the calculation model of equivalent ice thickness of overhead line under uniform ice cover,but there is a lack of research on OPGW ground ice covering with large cross-section and large unit length weight,especially the applicability of the equivalent ice thickness calculation model under microterrain.In this paper,the three-tower and two-gear OPGW ground wire model under three typical terrains(hillside,mountain top and pass)is established by finite element software,and the error analysis of the equivalent ice thickness model of traditional transmission lines is carried out by combining the equivalent ice thickness model considering the deflection angle of the insulator string,and the results show that the traditional ice thickness calculation error is large when the equivalent ice thickness is small.However,with the increase of the average equivalent ice thickness,the ice thickness calculation error decreases significantly.Based on the above analysis results and the function relationship between the average equivalent ice thickness and the axial tensile force and inclination angle of the insulator string,an ice thickness error optimization calculation method is proposed,and the relative error of the improved ice thickness can be controlled within 10%.

关 键 词：不均匀覆冰 OPGW地线 微地形 有限元 计算模型 

分 类 号：TM752[电气工程—电力系统及自动化]