A low-cost mechanical circuit breaker (MCB) is an important solution in the field of dc breaking. However, the zero-crossing points in the breaking process of the existing MCBs are either insufficient in number or slow in generation, which limits the breaking performance of MCBs. This letter proposes a novel forced resonant MCB (FR-MCB). A large number of zero-crossing points can be generated in a short time by utilizing a resonant circuit and a power electronic-based auxiliary oscillation switch. Thus, the FR-MCB can exhibit more reliable and faster breaking performance while maintaining the low cost. After the detailed analysis of current oscillation and breaking process in the FR-MCB, a prototype experiment of up to 10 kV/8 kA is conducted to verify its feasibility.

中文翻译：

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一种采用辅助振荡开关过零的新型强制谐振机械直流断路器


低成本机械断路器（MCB）是直流开断领域的重要解决方案。然而，现有微型断路器分断过程中的过零点要么数量不足，要么产生速度慢，限制了微型断路器的分断性能。这封信提出了一种新颖的强制谐振 MCB (FR-MCB)。利用谐振电路和基于电力电子的辅助振荡开关可以在短时间内产生大量的过零点。因此，FR-MCB可以在保持低成本的同时表现出更可靠和更快的分断性能。在详细分析了FR-MCB的电流振荡和分断过程后，进行了高达10 kV/8 kA的样机实验，验证了其可行性。