Abstract
As to the problem that common high current fuses have a long cutout time at ms scale to protect the DC power source, an effective way for fast arc extinction and cutout of fuse is put forward in this study, based on the burst high-pulse current discharge from a parallelly connected filter capacitor. Through increasing the discharge current from the filter capacitor, the total cutout time of fuse can be reduced from ms to 40 μs after the load of the DC800 V power source was shorted in experiment. The method for designing the crucial parameters of the short-circuit fault protection in DC power source is also presented. Experimental results showed that the DC1500V/32A fuse with a single fuse body and solidified filling quartz sand can reduce the time before arc forms (T f) and total cutout time (T e) to 30 and 44 μs, respectively. The effects of the shorted load impedance on the DC power source protection are also studied. It showed that the dynamic short-load impedances formed by the breakdown semiconductor parts in short-circuit faults were <25 mΩ, and the corresponding T e of fuse was compressed in the range between 50 and 90 μs.
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