高速动车组用高温超导变压器的绕组结构优化设计和线圈批量绕制

从高速动车组用6 .6 MVA 高温超导变压器样机的总体设计和电磁方案出发, 根据国产高温超导线材的性能和结构特点, 开发并掌握了满足变压器样机耐压要求的高温超导线材绝缘包覆工艺, 确定了样机高压和牵引绕组用高温超导线材的截面规格. 在此基础上, 考虑工程化需要, 优化设计了构成绕组的串、 并联饼式线圈, 提出了线圈骨架结构和组装、 串联焊接、 并联线材交叉换位等方案. 之后, 成批试制了实验线圈, 得到了满意的临界电流测量结果, 验证了线圈设计和工程化方案的可行性.

Winding Structure Optimization and Coil Manufacture for High-temperature Superconducting Transformer for High-speed Train

Starting from the overall design and electromagnetic scheme of 6. 6 MVA high-temperature superconducting (HTS) transformer prototype for high-speed train, the properties and structural characteristics of domestic HTS wires were considered. Wrap insulation technique was developed and tested to meet the withstand voltage requirements of the prototype. Then, the cross-section dimensions of the insulated HTS wires using in the high-voltage (HV) and traction (TR) windings were decided. Based on the dimensions, series-parallel connected pancake coils were optimized considering the needs of engineering. The structures of the coil frames were proposed along with the programs of coil assembling, series-joint soldering and parallel-connected wires transposing. After that, test coils were manufactured using the scheme and their critical currents were measured at liquid nitrogen immersion. Approving results were obtained and proved the feasibility of the design and the engineering schemes.