海底电力电缆过载能力分析及其试验验证

摘要

Based on the conductor temperature rise principle of submarine power cable,its overload current is theoretically analyzed.Overload experiment of a typical 110 kV submarine power cable is carried out with thermal cycling test system,and the experimental data is fitted and analyzed,which proves that the overload capacity of a particular submarine cable in operation is determined by the initial conductor temperature and overload time.The impact of the two factors on submarine power cable's overload capacity is analyzed with MATLAB function curves,which obtains the conclusion that the overload capacity decreases along with the increase of initial conductor temperature and overload time.With the comparison between two conductor temperature rising curves during short-time overload,a simple calculation algorithm of conductor temperature rising during short-time overload is proposed,the feasibility of which is verified by testing data.The proposed algorithm provides a reference for the actual production.%基于海底电缆导体的温升原理,对其过载电流进行理论分析,并利用海底电缆热循环试验系统对典型110kV海底电缆进行过载试验并进行数据拟合、分析,证明了对于某特定海底电缆在运行中的过载能力由海底电缆导体初始温度和过载时间决定.利用MATLAB函数曲线分析这2个因素对海底电缆过载能力的影响,得出其随着导体初始温度和过载时间的增大而减小的结论.结合2条海底电缆短时过载导体温升曲线的比较,提出一种短时过载情况下导体温升的简易算法,利用试验数据验证了该方法的可行性,为实际生产提供了参考.