高功率低阻抗三平板传输线的设计

设计了Z箍缩实验装置中单路模块样机的低阻抗水介质三平板结构的传输线。根据三平板传输线的结构参数及相关计算公式,得到所设计的三平板传输线实际阻抗为4.08Ω(设计阻抗为4.00Ω)。在考虑传输线内板边缘与水箱耦合电容影响的条件下,采用有限元方法精确计算得到三平板传输线阻抗为3.77Ω。根据实验得到的传输线入口、出口电压电流测量结果,计算得到三平板传输线的实际运行阻抗为3.83Ω,与计算结果基本一致。另外,还对三平板传输线进行了静电场计算和分析,耐压实验表明,当三平板传输线出口电压达到3.1 MV时,未出现绝缘闪络,绝缘设计满足指标要求。

Design for high power and low impedance triplate transmission line

A low impedance triplate transmission line, consisting of three parallel plate-electrodes, filled with de-ionized water, was designed for the Z-pinch Primary Test Stand (PTS) prototype. The determination of the triplate line's parameters by its characteristic impedance cannot use the traditional bi-plate impedance formula, since the coupling-capacitance between the inner plate edge and water tank must be considered. The rated impedance of the triplate line was 4.00 Ω, and the designed impedance reached 4.08 Ω by the dimension of the triplate line without water tank. When considering capacitance coupling between triplate edge and water tank, the triplate line's impedance was 3.77 Ω by precise FEM calculation. While, the actual operation impedance was 3.83 Ω according to measured voltage and current waveform, showing good agreement with the calculated results. The insulation of the triplate line was also considered. The rated working voltage of the triplate line was 3 MV, and there was no flashover when the voltage of output end reached 3.1 MV in experiment, indicating that the triplate line's insulation design was reliable.