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一、三相電壓或電流均分別以零相序,負相序及正相序所共同組成,例如 IA=IA0+IA2+IA1,試問在正常三相平衡供電情形下,三相電流與零相序、負相序及正相序相量電流以相量圖說明其相互關係?(15 分
問題詳情
一、三相電壓或電流均分別以零相序,負相序及正相序所共同組成,例如 IA=IA0+IA2+IA1,試問在正常三相平衡供電情形下,三相電流與零相序、負相序及正相序相量電流以相量圖說明其相互關係?(15 分)感應電動機三相供電電流持續含有 5%負相序電流,試問此電動機會發生何種物理現象?(5 分)並以相量圖表達在某瞬間之三相電壓。(5 分)
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2. In Taiwan, most high school students are under heavy _______ pressure. They have to study very ha
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【題組】32. (A) are aimed (B) aimed (C) aiming (D) that aimed
【題組】42. (A) Over (B) With (C) Since (D) Without
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【題組】33. (A) Whatever (B) However (C) Whoever (D) Whenever
【題組】43. (A) Instead (B) Fortunately (C) Furthermore (D) Strictly
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一、請說明測量極低電阻用凱文電橋(Kelvin Bridge)之基本原理。(20 分)
【題組】34. (A) take care of (B) consist of (C) pass on (D) keep in mind
【題組】44. (A) call (B) called (C) calling (D) is called
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