2磁势折算
N1I2’=N2I2=I2N2/N1=I2/k
变压器折算前后副绕组磁势不变。k也为电流折算系数。
3阻抗折算
阻抗折算要保持功率不变
折算前后副边铜耗不变
I2’I2’R2’＝I2I2R2
R2’=(I2/I2′)(I2/I2′)R2=kkR2
(kk)—阻抗折算系数
副边漏抗上的无功功率不变，则
I2’I2’X2σ’=I2I2X2σ
X2σ’=(I2/I2′)(I2/I2′)X2σ=kkX2σ
负载阻抗上的功率不变，则可求出
I2’I2’RL’=I2I2RLRL’=kkRL
I2’I2’XL’=I2I2XLXL’=kkXL
4副边电压折算
u2’=I2’ZL’=(I2/k)(RL+jXL)kk=kI2（RL+jXL）=kU2
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