As for DC fuses, power capacity of the test device is heavily demanded in high current short-circuit tests, which constrains the development of high-breaking-capacity DC fuses. According to the characteristics of the DC fuses, three equivalent conditions are introduced:similar pre-arcing time, similar arcing energy, and similar recovery voltage. Meanwhile, two equivalent test methods are presented. The first method is to increase the resistance value of the direct test circuit, and the second method is to employ a bank of capacitors as the power source. By means of setting rational parameters for the proposed methods, a good equivalence to direct test and low cost can be obtained. Furthermore, the equivalence and its parameters setup of the proposed methods are discussed and illustrated. Finally, the proposed equivalent test methods and the direct test are compared through 110 kA short-circuit test, with DC fuses rated 1200 V/1250 A and 1200 V/200 A, which further verify the effectiveness of the proposed methods. The two equivalent test methods can be applied in short-circuit test of the DC current limiting circuit breakers. This work is supported by National Natural Science Foundation of China (No. 51177169).% 直流熔断器进行大短路电流分断试验的成本很高，制约了高分断能力直流熔断器的发展。根据直流熔断器的特性提出了保持试验一致性的三个等效条件：弧前时间一致、燃弧能量一致、恢复电压一致，据此提出了两种等效试验方法。方法一适当提高直接试验回路的电阻值，方法二采用电容器组作为电源，通过合理的参数设置可保证两种方法与直接试验具有较高的等效性，同时又降低了试验成本。讨论了两种方法的参数设置和等效性，最后以额定1200 V,1250 A及额定1200 V,200 A两种直流熔断器进行110 kA短路分断试验为例，对比了两种等效试验方法和直接试验的结果，验证了所提方法的有效性。该方法可参考应用于直流限流断路器的短路分断试验。
展开▼
