[課業] 電力系統:－2016韓劇推薦排行榜 , 2016韓劇推薦好看的 , 2016韓劇推薦必看 , 2016韓劇 , 2016韓劇排行榜前十名 , 韓劇推薦 ,

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批踢踢實業坊 Examination 板

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[課業] 電力系統

Oct 27th 2013, 19:45, by sionbarzard

作者sionbarzard (ygre)

看板Examination

標題[課業] 電力系統

時間Sun Oct 27 19:45:33 2013

這幾天做歷屆有幾個疑問 1.95年關務三等第二題,本來我想貼題目的,但我上考選部發現題目跟李進雲選錄的不一樣這題他題目有個部分是給2000HP電動機電抗16%,然後他選定容量基準是5MVA 然後他標么值轉換計算是0.16*5000/2000,請問這解法沒錯嗎?不用把HP轉換成瓦特嗎? 2.計算三項相稱故障時,如果題目給不考慮故障前負載電流是不是只能用戴維寧去算? 3.穩定度那章的單位慣量常數H,寫題目時有看過三種單位一種是(秒),一種是(MJ/MVA),另一種是(PU-S),請問這三種有啥差別嗎? 一般看到好像都是MJ/MVA這單位李進雲那本解法前兩種單位都是直接帶,第三種如 http://wwwc.moex.gov.tw/ExamQuesFiles/Question%5C100/100070_31270.pdf 第四題,他的解法是以100MVA為基準,H1=2.5*400/100=10MJ/MVA 請問這公式是怎麼來的? 希望版上高手能給與指點,謝謝! -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 1.173.15.104

→ ayangod:第1題算故障電流~電動機HP可等於KVA~~因為故障電流很大 10/27 20:13

→ ayangod:換成瓦特也可差不了多少..兩個都對.. 10/27 20:13

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