摘要
三相同轴超导电缆各相半径不同,影响电磁参数对称性,造成三相电流的不平衡,增加了交流损耗。为此,提出一种二分型粒子群优化算法,实现对三相均流的优化。该方法将电缆C相超导层和屏蔽层分为半径相同、节距和绕制方向不同的两段,通过调整节距和绕制方向,三相电流矢量不平衡度可降到5%以内,且屏蔽层电流几乎为0。为了防止电缆因短路等故障电流冲击而损坏,电缆结构中加入与三相超导层并联的铜保护层,在故障发生时大多数短路电流从铜保护层流过,从而起到保护超导电缆的作用。设计了一根10 kV/1 kA的二分型三相同轴超导电缆,研究了铜保护层的分流特性,最后制作了5 m长的电缆样缆,并对样缆在77 K运行温区下进行了三相通流试验,试验结果验证了算法的有效性。
The different phase radius of three-phase coaxial HTS cables affects the symmetry of electromagnetic parameters,resulting in the imbalance of three-phase current and increasing AC loss.Therefore,a two-section particle swarm optimization algorithm was proposed to divide the phase-C conductor layer and the copper shield layer into two sections with the same radius and different pitch and winding direction.By adjusting the pitch and winding direction,the three-phase current imbalance ratio could be reduced to less than 5%,and the current of shield layer could be reduced to almost zero.In addition,in order to prevent the cable from being damaged by the impact of fault current,the copper protective layer was added in parallel with the superconducting layer.When fault occured,most of the short-circuit current flowed through the copper protective layer.A 10 kV/1 kA three-phase coaxial HTS cable was designed and the current sharing of the copper protective layer under three-phase short circuit fault was studied.Finally,a 5 m long sample cable was fabricated and its three-phase current distribution is tested.The results verify the effectiveness of the algorithm.
作者
杨启帆
诸嘉慧
陈盼盼
张宏杰
刘家亮
Yang Qifan;Zhu Jiahui;Chen Panpan;Zhang Hongjie;Liu Jialiang(China Electric Power Research Institute,Beijing 100192,China)
出处
《低温与超导》
CAS
北大核心
2022年第11期26-31,38,共7页
Cryogenics and Superconductivity
基金
国家电网公司科技项目(DG71-20-006)资助。
关键词
三相同轴超导电缆
二分型
铜保护层
层间分流
优化算法
Three-phase coaxial HTS cable
Two-section
Copper protective layer
Current distribution
Optimal algorithm
