89年電機技師 電力系統 - 考試
By Frederica
at 2013-10-17T19:38
at 2013-10-17T19:38
Table of Contents
題目: http://ppt.cc/QeVK
解答:(1) http://ppt.cc/rUqK
(2) http://ppt.cc/D5Mp
拍的有點不夠清楚。
我是想問觀念,題目忽略故障前之負載電流。
想問說 Zth 這樣求有誤嗎?
Zth = (Xd" + Xt1 + Zline + Xt2) // (Xd"//ZL) = j0.699 // j0.391 // 6.25
= j0.247 // 6.25 = 0.247∠87.74 (pu)
其中: ZL = VL^2 / (ZL*) = 1^/ (4M/25M) = 6.25(pu)
電動機 Xd" = (25M/16M) * (j0.25) = j0.391(pu)
另外它問故障說A相電流標么值應該指的就是if"吧?
可以的話麻煩各位幫忙看看,謝謝您。
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