中文摘要：

电流转移是混合式直流断路器能够成功开断电流的前提，针对混合式直流断路器的电流转移特性展开了研究。首先通过试验测量具有不同触头结构及触头材料的真空电弧电压。试验结果表明电流为0MkA时，电弧电压约16~22V；且改变触头结构、触头材料及触头开距等无法有效提高电弧电压，所以提高真空电弧电压以驱动电流转移的方法并不可行。为此，首次提出了一种应用换流驱动电路的电流转移方法。对换流驱动电路建立了数学模型，并通过试验验证了仿真模型。最后，针对基于换流驱动电路的混合式直流断路器，设计试验回路并进行了电流转移等效模拟试验。试验结果表明：该电流转移方法能够保证混合式直流断路器中电流在200μs时间内可靠转移。该试验结果验证了基于换流驱动电路的电流转移方法应用于混合式直流断路器的有效性。

英文摘要：

Reliable commutation of the current is the prerequisite for the hybrid direct current circuit breaker （DCCB） to interrupt the current successfully. Therefore, the current commutation characteristics in the hybrid DCCB are investigated. The arc voltage of varuum interrupter （VI） with different contact structures or materials is measured first. According to the measured results, with the current in the range of 0-1 kA, the arc voltage of single VI varies from 16 V to 22 V, and it cannot be enlarged sis~ificantly by changing the contact structure or contact material. Therefore, the method to commu- tate the current by enlarging the arc voltage is not feasible. A current commutation drive circuit （CCDC） is proposed for the first time to commutate the current in hybrid DCCBs. A mathematical model for the CCDC is established, and it has been verified by related test results. In the end, the equivalent current commutation experiments are carried out. The ex- perimental results show that by using CCDC, the current can be commutated in 200 μs and the validity of the CCDC for current commutation in hybrid DCCBs is verified by the experimental results.