CSNS/RCS脉冲电源均匀传输线障碍点分析

通过研究均匀传输线特征阻抗失配原理，发现传输电缆特征阻抗失配会导致负载终端励磁电流幅值发生畸变。对电源主电路关键参数进行分析，发现均匀传输线匹配阻抗失配会造成磁铁处励磁电流幅值变小，上升时间变短。建立均匀传输线障碍点等效模型，推导出脉冲电源传输线障碍点处反射系数，对串联电阻和并联电阻障碍点深入分析，发现传输线特征阻抗失配，会导致匹配负载处有功功率减小。最后通过高压电缆被击穿故障使其得以验证。

Analyses of barrier points of uniform transmission line for CSNS/RCS pulse power supply

By studying the principle of characteristic impedance mismatch of uniform transmission line, it is found that the characteristic impedance mismatch of transmission cable will lead to the distortion of excitation current amplitude of load terminal. The key parameters of main circuit for power supply are analyzed, the amplitude and rise time of the excitation current at the magnet are decreased, when the matching impedance of the uniform transmission line is mismatched. By establishing the equivalent model of barrier point in uniform transmission line, the reflection coefficient at the barrier point of the uniform transmission line is derived. Based on the analysis of series resistance and parallel resistance at the barrier, it is found that the mismatch of transmission line characteristic impedance will lead to the decrease of active power at matching load. It is verified by the breakdown of high voltage cable.