Study of contact resistance in the design of a pyro-breaker applied in superconducting fusion facility

Pyro-breaker is a fast-responding and high-reliable explosive-driven circuit breaker,which has been applied in several quench protection systems,such as International Thermonuclear Experimental Reactor and Experimental Advanced Superconducting Tokamak.As an indispensable back-up switch,Pyro-breaker guarantees the reliability and safety of the system and avoids tremendous loss when quench happens.Electrical contact,a crucial part of an electrical device greatly determines the steady current capacity of a Pyro-breaker.However,due to the complexity of the model and the deficiency knowledge of the microstate of contact areas,an accurate calculation for contact resistance is difficult to acquire.A study of electrical contact in the design of a Pyro-breaker has been presented in this paper.An engineering calculation method is verified with experiments.Parameters are fitted for the presented model,which will be a significant theoretical basis for the future designing.

用黑盒电弧模型的爆炸开关中直流电弧的仿真

爆炸开关是一种由炸药驱动、快速响应、高可靠性的直流断路器,已在ITER、EAST等多种失超保护系统中得到应用。作为一种直流断路器,电弧是决定其换流过程的主要因素,其水下燃弧、熄弧的特性的相关研究是目前此类断路器设计中的空白。电弧动态模型是研究电弧特性的常用方法,当建立的模型与试验过程中所观察到的断路器性能有良好的对应关系时,模型可用于建立爆炸开关的结构设计和换相特性之间的关系,为开关的设计优化提供理论依据。通过分析对比了几种不同的电弧模型,给出了适用于爆炸开关设计过程中的黑盒电弧模型,应用了Parameter Sweeping Strategy,研究了电弧模型中的参数取值规律,并结合试验验证了这种模型的可行性,为中国核聚变工程试验堆(CFETR)失超保护系统中爆炸开关中的研制提供了理论依据。