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[考題] 基本電學 問題
Nov 30th 2013, 12:06, by Douglass

作者Douglass (^___^)

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標題[考題] 基本電學 問題

時間Sat Nov 30 12:06:27 2013

[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處 題目:一30kw、PF=√3/2之平衡y接電路,接於200v之三相電源,可以算出: 線電流=負載電流=100a,負載電壓=200/√3,各阻抗=2/√3,各電阻=1, 試問若改成三角形連接,且仍接於原電源,則功率變成___倍? 想法:這是課本用阻抗=2/√3,電阻=1,算出負載電流=100√3,代入p=3*i^2*r, p=3*(100√3)^2*1=90kw也就是原來的3倍。 我的疑問是,y形變三角形的話,兩者互為等效電阻,但各阻抗不是會變 成原來的3倍??那怎麼還帶原來的阻抗下去算呢@@? 打這麼亂不知大家看不看得懂,麻煩各位高手解答了,謝謝! -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 219.85.102.23

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