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1 有一具50kVA、2400V/240V、60Hz之單相變壓器,在額定頻率下做開路及短路試驗,求得數據如下:開路試驗:VOC = 240V IOC = 5.41A POC = 186W短路試驗:VSC = 48V ISC = 20.8A PSC = 617W下列各值何者錯誤?
A 無載功因為0.143
B 磁化電流為4.63A
C 鐵損電流為0.775A
D 短路功因為0.618

cosθ =PocV(oc)×Ioc =186240×5.41 = 0.143

磁化電流Im = Iocsinθ = 5.41×1-0.1432 = 5.35A