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针对强迫换流型限流断路器分断双向高上升率短路电流时关断电流的分流问题及其在关断额定及小电流时存在的过大冲击和需要判断电流方向等问题,该文提出一种新型的双向强迫换流型直流限流断路器方案,对故障电流和额定及小电流的关断分别采用不同的触头驱动模式和不同关断电路.分析电弧电压、真空开关支路及二极管支路分布电感对关断电流分流的影响规律,得到保证关断电流全部用于反向关断真空开关的约束条件及设计方法.设计900V/1kA断路器样机并完成额定和短路分断试验,可将初始上升率约为22A/μs的短路电流限流至10.9kA,分断时间小于1ms,分断额定电流时关断脉冲电流仅为1700A.试验结果表明,所提出方案的有效、可行和分析准确、可信.“,”In order to solve the problem of current diffusion of the pulse current when traditional current limiting circuit breaker switching off high rate of current rise and the problem of huge impact and need to detect the direction of current, a new type of bi-directional DC current limiting circuit breaker scheme was proposed. Different mechanical contact driving mode and different forced switching off circuit were used to cutting off fault current and rated current. The effect of arcing voltage and inductance of the vacuum switch circuit and diode circuit toward the current diffusion of forced current was analysis, and the design method of the both forced current circuit were obtained. A 900V/1kA circuit breaker prototype was designed and the rated and short circuit breaking test was completed. The short circuit current with an initial rise rate of about 22A/μs is limited to 10.9kA, and the breaking time is less than 1ms, and when breaking the rated current, the turn off pulse current is only 1700A. Test results show that the proposed scheme is effective, feasible and analyses are accurate and credible.