Medium-voltage fuse melt resistance accurate measurement circuit and measurement method thereof

The invention relates to a medium-voltage fuse melt resistance accurate measurement circuit and a measurement method thereof. The measurement circuit comprises an adjustable alternating-current voltage source, a current booster, an alternating-current voltage measurement module and an alternating-current measurement module. A primary winding of the current booster is connected with the two ends ofan adjustable alternating-current voltage flow source, a secondary winding of the current booster is connected with the two ends of a fuse, and the current booster outputs set current by adjusting the output voltage of the adjustable alternating-current voltage source. The AC voltage measurement module and the AC current measurement module respectively measure the voltage and the flowing currentat the two ends of the fuse under each current in real time, and calculate the resistance R of the fuse under each current, wherein R = U/I * cos theta. The resistance value of the melt under a plurality of currents is automat