【摘要】 本文研究以多芯不锈钢加强Bi2223/Ag带材绕制的45 kVA单相高温超导变压器的交流损耗特性.变压器绕组置于具有室温孔径的环形玻璃钢杜瓦内,铁芯穿过杜瓦室温孔径以保证铁芯与绕组分离并工作于室温环境.在77 K和工频下,基于Bean模型和绕组中的磁场分布计算了绕组的交流损耗,计算结果与传统电测法和热测法测量的变压器交流损耗结果一致;表明在77K绕组中交流损耗以磁滞损耗为主,涡流损耗和耦合损耗可以忽略不计.更多还原

【Abstract】 This paper describes the AC losses in windings of a single-phase model 45kVA (HTS) transformer woundwith stainless steel-enforced multifilamentary Bi2223/Ag tapes. The windings were placed in an electrical insulation toroidal cryostat with room temperature bore for iron core. AC losses induced in the windings were theoretically estimated based on Bean-model and magnetic field distribution, which are good agreement with the actual ones measured by conventional electrical and calorimetric methods at rated current operation and power frequency 50Hz in liquid nitrogen of 77K. Based the calculated and measured results, it is shown that the hysteretic loss in windings is dominant, the eddy current and coupling loss are negligible.更多还原