超导故障限流器螺旋线圈交流损耗特性的研究

Research on AC loss characteristics of spiral coil in superconducting fault current limitting

超导故障限流器(SFCL)是超导电力应用的一个重要器件,本文采用Bi-2212和YBCO材质的高温超导体来制作SFCL,其具有大容量电流和高电场的优点。作为22. 9kV/25MVA配电系统中SFCL的初期应用阶段,为减少SFCL的交流损耗,制备几种形状线圈的故障电路限制元器件,通过实验研究导体排列和电力方向对故障限流线圈交流损耗特性的影响。经测试,单线型和双线型螺旋线圈的交流损耗均依赖于导体的排列和电流方向,双线型螺旋线圈在导体排列相同的情况下,其交流损耗取决于电流方向。

Superconducting fault current limiting( SFCL) is an important device in superconducting applications. The paper used high temperature superconducting( HTS) conductor such as Bi-2212 bulk and YBCO film to make SFCL with the merits of large current capacity and high allowable electric field. As an earlier application stage of our 22. 9 k V/25 MVA SFCL system development,we prepared several samples of the fault current limiting elements in a coil shape to reduce AC loss of the SFCL system. The effect of conductor’s arrangement and current direction on AC loss characteristics of the fault current limiting coils was investigated experimentally. The test result shows that the measured AC loss in single helical coil and bifilar helical coil depends on the conductor’s arrangement and also on the current direction. In the bifilar helical coil,the AC loss depends on the current direction in the same arrangement of conductors.