Introduction was made to the application of the current hedge method in the reliable interruption of direct current (DC) circuit breakers, and analysis was made to the operating principle of the current hedge method and the technical problems in the test process. Through the co-use of the thyristor devices with high parameters, saturated reactors and synchronous operating mechanism, the reliable and accurate interruption of DC circuit breakers were achieved. The result shows that the key point is how to accurately seize the hedge point of two circuits in the interruption process by controlling the synchronous operating mechanism and trigger thy-ristor devices. The current hedge method takes full advantage of the thyristor devices, ensuring the accuracy of the whole interruption process. The di/dt of hedge current at current zero and the rising amplitude of peak reverse voltage have been suppressed effectively by saturated reactors, and the thyristor devices have also been protected. The whole circuit costs economically and largely make up for the shortcomings of the traditional methods.%介绍了电流对冲法在直流断路器可靠开断方面的应用,分析了电流对冲法的工作原理和试验过程中遇到的技术问题,通过高参数晶闸管器件、饱和电抗器和同步操作机构的配合使用,实现了直流断路器精确、可靠的开断,结果表明:通过控制同步操作机构和触发晶闸管器件来精确把握开断过程中两个回路的对冲点是关键,电流对冲法充分利用了晶闸管器件的优点,保证了整个开断过程的精确性;饱和电抗器有效抑制了对冲电流过零时的di/dt和反峰电压的增长,保护了晶闸管器件;整个回路造价经济,很大程度上弥补了传统试验方法中的不足.
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