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變壓器電流計算方式疑慮?

Aug 12th 2014, 04:15

因小弟對變壓器計算方式不太了解，想請教幾個問題
在這高手雲集的地方，還煩請各位高手們幫忙解惑，謝謝。

Ex：一變壓器30KVA
一次側電壓 3相3線式 380v
二次側電壓 3相4線式 190/110 v，電流為?

Ans：
電流計算方式為
30KVA*0.8 = 24KW
一次： 24KW = 1.732*380V*I*0.8 I = 45.58 A
二次： 24KW = 1.732*190V*I*0.8 I = 91.16 A
24KW = 1.732*110V*I*0.8 I =157.46A

190V二次側電流 RS – ST – TR 各線間滿載電流為 91.16A
表示最大可以使用到91.56A

110V二次側電流 RN – SN– TN各相間滿載電流為 157.46A
表示最大可以使用到157.46A

想請問：
1.上述計算及論述方式對嗎?
2.輸出為 3相3線式和 3相4線式算法相同嗎 ? ( Y接? △接?)

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