Due to the increasing power system capacity, the interruption of large fault currents has gradually become a major challenge in power systems. At the moment, such currents are interrupted mainly via circuit breakers based on the method of active current commutation. However, these types of circuit breakers tend to be costly and oversized. One possible alternative—a fuse-based circuit breaker with current commutation process enhanced by an external transverse magnetic field (ETMF)—is proposed by the authors. Its main advantage lies in the fast current commutation achieved by an ETMF-enhanced three-stage increase of the vacuum arc voltage. The study of the current commutation process is mainly represented by the authors, and the influencing factors of the current commutation—contact opening speed and ETMF current—are discussed. At last, the proposed circuit breaker is verified by an experiment, whose results show that a short-circuit current of 42 kA can be interrupted within just 2 ms.

中文翻译：

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一种带有外部横向磁场增强真空灭弧室的熔断器直流断路器

由于电力系统容量不断增加，大故障电流的开断逐渐成为电力系统面临的一大挑战。目前，主要通过基于主动电流换向方法的断路器来中断此类电流。然而，这些类型的断路器往往价格昂贵且尺寸过大。作者提出了一种可能的替代方案——基于熔断器的断路器，其电流换向过程通过外部横向磁场 (ETMF) 增强。其主要优点在于通过ETMF增强型三级真空电弧电压增加实现快速电流换向。对电流换相过程的研究主要以作者为代表，讨论了电流换相的影响因素——触头打开速度和ETMF电流。最后，对所提出的断路器进行了实验验证，结果表明，仅需2 ms即可分断42 kA的短路电流。