铌三锡管内电缆导体交流损耗计算分析模型

Calculation and Analysis Model of AC Loss forNb_3 Sn-Based CICC

为解决快变磁场中大电流和应变作用下,铌三锡(Nb3Sn)导体交流(Alternating Current,AC)损耗的模拟实验分析问题,本文进行了瞬变电磁场中宽应变区间的AC损耗计算技术探索,构建应变作用下的临界电流数学模型,把复杂变化场中基于应变的临界电流密度运用到磁滞损耗功率计算,对耦合损耗功率计算中的导体特征参数考虑应变效应,获得CICC导体AC损耗功率计算技术。在激发等离子体的快速励磁以及等离子体放电和破灭等情况下,由模拟对比分析发现应变作用算法的AC损耗功率更接近工程实际值;对比应变作用算法损耗功率和经典算法损耗功率的相对误差计算,其误差的变化小于15%。

To solve the problem of alternating current （AC） loss mechanism for Nb3Sn conductor with strain under the condition of high-current and transient magnetic field, research of AC loss calculation method is carried out in the transient electromagnetic field and wide range of strain. The mathematical model of the critical current with effect of strain is built. Moreover, the critical current density based on strain is introduced for the calculation of hysteresis loss power. Taking into account strain effects, the characteristic parameters are obtained, and the calculation technology of CICC AC loss power is obtained. By comparative analysis of simulation, it is found that the AC loss power calculation of the conductor with strain model is close to the actual project value. For rapid excitation, in particular plasma discharge and burst, strain model and the traditional algorithm is consistent. From the calculation of AC loss power, it can be seen that the relative error is less than 15%.