This paper describes a novel configuration of a quench protection circuit for a high-temperature superconducting (HTS) ship propulsion motor that can protect the HTS coils from an unexpected outage in its cryogenic cooling system. The quench protection circuit consists of conductor parts placed adjacent to the HTS coils and dump resistors and diodes placed in the cryogenic-temperature and normal-temperature areas, respectively. The conductor parts are shaped and arranged such that the magnetic coupling with the HTS coil is extremely large. Thereby, the current of the HTS coils can be instantaneously attenuated immediately after the quench protection is activated. With this configuration, the electromagnetic energy of the HTS coils can be absorbed in the dispersed parts. This can make the dump resistors smaller and make it easier to install them on a HTS ship propulsion motor. By analysing the equivalent electric circuit model of the protection circuit, we derived the conditions under which instantaneous current attenuation of the HTS coil occurs. In accordance with the conditions, we have fabricated a quench protection circuit that protects one HTS field pole of the 3 MW HTS motor developed by Kawasaki Heavy Industries. The fabricated circuit was empirically evaluated and proved to be highly effective in quench protection. The present quench protection circuit technology contributes to the practical application of HTS ship propulsion motors.

本文介绍了一种用于高温超导 (HTS) 船舶推进电机的失超保护电路的新型配置，该电机可以保护 HTS 线圈免受其低温冷却系统意外中断的影响。失超保护电路由放置在 HTS 线圈附近的导体部件和分别放置在低温和常温区域的转储电阻器和二极管组成。导体部件的形状和布置使得与 HTS 线圈的磁耦合非常大。因此，在失超保护启动后，高温超导线圈的电流可以立即衰减。通过这种配置，HTS 线圈的电磁能可以被分散的部分吸收。这可以使转储电阻器更小，并使它们更容易安装在 HTS 船舶推进电机上。通过对保护电路等效电路模型的分析，推导出了高温超导线圈发生瞬时电流衰减的条件。根据条件，我们制作了一个失超保护电路，用于保护川崎重工开发的 3 MW HTS 电机的一个 HTS 磁极。制造的电路经过了经验评估，并证明在失超保护方面非常有效。目前的失超保护电路技术有助于高温超导船舶推进电机的实际应用。我们推导出了 HTS 线圈发生瞬时电流衰减的条件。根据条件，我们制作了一个失超保护电路，用于保护川崎重工开发的 3 MW HTS 电机的一个 HTS 磁极。制造的电路经过了经验评估，并证明在失超保护方面非常有效。目前的失超保护电路技术有助于高温超导船舶推进电机的实际应用。我们推导出了 HTS 线圈发生瞬时电流衰减的条件。根据条件，我们制作了一个失超保护电路，用于保护川崎重工开发的 3 MW HTS 电机的一个 HTS 磁极。制造的电路经过了经验评估，并证明在失超保护方面非常有效。目前的失超保护电路技术有助于高温超导船舶推进电机的实际应用。