批踢踢實業坊 Examination 板: [考題] 102高普考電力系統第三題－2016徵求年菜推薦網路訂購最紅的商家.年菜訂購?台北年菜外送餐廳推薦(年菜)?年菜.今年不想做年菜推薦,網路宅配哪一家好?

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批踢踢實業坊 Examination 板

Jul 12th 2013, 10:48, by letterstar

作者letterstar (letterstar)

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標題[考題] 102高普考電力系統第三題

時間Fri Jul 12 10:48:52 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:三相,60HZ Y接同步發電機之中性點接地,無載時期正相序電壓對中性點為2500V.若忽略發電機之內電阻,假設內部感應電動勢經固定磁激控制為定直.在運轉期間該發電機受到各種不同故障,故障電流大小精電力系統監錄儀紀錄如下 (1)三相故障電流1000A (2)線間故障電流1500A (3)單線故障電流2400A 求 (一)正相序之標么抗值及相對應電感值 (二)負相序之標么抗值及相對應電感值 (三)0相序之標么抗值及相對應電感值 SOL: 小弟疑問是2500V到底是相電壓還是線電壓考試時就直接相電壓算了,現在才想到不過標么值應該不可能算出來,因為沒基準值附上小弟算的結果 (1)正相序 2.5J , 6.63mH (2)負相序 0.3868J , 1.026mH (3)0相序 0.238J , 0.6313mH 請客高手解答小弟疑惑 THX -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 1.175.117.95

推 QQkimi:他題目說正序電壓對中性點，已經是相電壓了你算的跟我一樣 07/12 11:06

推 QQkimi:我標么額定電壓值設定為無載電壓2500V 短路額定電流值1000A 07/12 11:12

→ peterpan7361:應該為相電壓無誤,由於過去考題多以提供線電壓為主, 07/12 11:13

→ peterpan7361:所以看到時都會覺得有點奇怪,不過題意以告知對中性點 07/12 11:14

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