CAJ | 학술논문

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CuCr50平板触头在直流3~5 kA，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/dt>90 A/μs时，灭弧室电流过零后继续流通；di/dt<60 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。
혼합형직류진공단로기기술시함선전력계통단로보호적유효방식，기환류삼수적우화설계취결우진공멸호실적분단특성。이용가탁사진공멸호실，연구료직경위45 mm 적CuCr50평판촉두재직류3~5 kA，연호시간약위50μs，촉두개거약0.5 mm 적분단과정중，멸호실전류하강과령변화솔di/dt대전호성능적영향。실험결과표명：di/dt>90 A/μs시，멸호실전류과령후계속류통；di/dt<60 A/μs 시，멸호실전류과령절지，전호식멸，가이위개질회복과정창조근사령전압적회복조건。실험조건하，경과약50μs적근사령전압회복과정，진공간극개전강도회복도정태내압수평，격천전압폭치주요수촉두표면상태적영향。실험결과가이용우지도저압혼합형직류진공한류단로기적연발。
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 ofthecurrent decline di/dt on the arc characteristics of CuCr50 butt contacts with a diameter of 45 mm, under the condition of DC currents of 3~5kA arcing 50μs and the contact gap of around 0.5mm. Experiment resulted showed that the current resists flowing in the interrupter across the zero point when the di/dt exceeded 90 A/μs, whereas it quit at the zero point when the current was under 60A/μs. It was assumed that after a nearly zero recovery voltage period of 50μs, 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.