计及断股损伤的架空导线交流电阻计算模型研究  

Research on the calculation model of AC resistance for overhead conductors considering strand breakage damage

作　　者：薛海军 文龙 管杰 丁同臻 XUE Haijun;WEN Long;GUAN Jie;DING Tongzhen(Zhoushan Power Supply Company of State Grid Zhejiang Electric Power Co.,Ltd.,Zhoushan Zhejiang 316000,China)

机构地区：[1]国网浙江省电力有限公司舟山供电公司,浙江舟山316000

出　　处：《宁夏电力》2023年第4期15-21,共7页Ningxia Electric Power

摘　　要：架空导线断股后,相应交流电阻增大,造成线路局部热点,影响输电安全性。现有导线交流电阻计算模型大多针对无损导线建立,为准确评估导线断股发热对线路运行的影响,有必要建立计及断股损伤的导线交流电阻模型。为此,以LGJ-120导线为对象,通过对交流电阻实测,提出断股导线电阻的多项式模型,并利用最小二乘方法对多项式系数进行了估计。计算结果和实验结果对比表明,所提模型具有较高精度,能够在不同断股程度下,有效反映交流电阻随导线温度和电流的变化。When an overhead conductor experiences strand breakage,the corresponding AC resistance increases,leading to the formation of local hotspots in the transmission line,which can adversely affect the safety of power transmission.Existing models for calculating the AC resistance of conductors are primarily developed for conductors without damage.To accurately assess the impact of strand breakage-induced heating on the operation of transmission lines,it is essential to establish a model that considers strand breakage damage.This study focuses on the LGJ-120 conductor and proposes a polynomial model for the resistance of conductors with strand breakage based on AC resistance measurements.The polynomial coefficients are estimated using the least squares method.A comparison between the calculated results and experimental data indicates that the proposed model exhibits high accuracy and can effectively reflect the variations in AC resistance with changes in conductor temperature and current under different degrees of strand breakage.

关 键 词：断股 交流电阻 最小二乘法 参数估计 

分 类 号：TM751[电气工程—电力系统及自动化]