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中文摘要：
混合型直流真空断路器技术是舰船电力系统短路保护的有效方式,其换流参数的优化设计取决于真空灭弧室的分断特性。利用可拆卸真空灭弧室,研究了直径为45 mm的Cu Cr50平板触头在直流3-5 k A,燃弧时间约为50μs,触头开距约0.5 mm的分断过程中,灭弧室电流下降过零变化率di/dt对电弧性能的影响。实验结果表明：di/dtμ90 A/μs时,灭弧室电流过零后继续流通;di/dtμ60 A/μs时,灭弧室电流过零截止,电弧熄灭,可以为介质恢复过程创造近似零电压的恢复条件。实验条件下,经过约50μs的近似零电压恢复过程,真空间隙介电强度恢复到静态耐压水平,击穿电压幅值主要受触头表面状态的影响。实验结果可以用于指导低压混合型直流真空限流断路器的研发。
英文摘要：
The hybrid DC vacuum circuit breaker（HDCVCB） is effective for short circuit protection in the marine DC power system, and its commutation circuit parameters are decided by the interruption characteristics of the vacuum interrupter. A demountable vacuum chamber was used to study the influence of the current decline di/dt on the arc characteristics of Cu Cr50 butt contacts with a diameter of 45 mm, under the condition of DC currents of 3~5 k A arcing 50 μs and the contact gap of around 0.5 mm. Experiment resulted showed that the current resists flowing in the interrupter across the zero point when the di/dt exceeded 90A/μs, whereas it quit at the zero point when the current was under 60 A/μs. It was assumed that after a nearly zero recovery voltage period of 50 μs, the gap recovered to its ultimate breakdown voltage, and the voltage withstanding capability was mainly influenced by the contacts＇ surface condition. The experiment results can provide some guidance for low voltage hybrid DC vacuum limiting circuit breaker developments.
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