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1 一電壓比為5000V / 500V之理想變壓器,高壓側激磁電流為0.5 A,無載損失為1500W,則其磁化電流為多少? 96 統測
A 0.3A
B 0.4A
C 0.5A
D 0.6A

cosθ=Poc/(VocIoc)=1500/(5000×0.5)=0.6

sinθ=12-0.62=0.8

磁化電流Im=Iocsinθ=0.5×0.8=0.4A