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electrical ciruit problems

 

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http://i599.photobucket.com/albums/tt72/goldfish_gem/gfggb.jpg 更新: http://i599.photobucket.com/albums/tt72/goldfish_gem/fbbgfggbf.jpg

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圖片參考：http://i599.photobucket.com/albums/tt72/goldfish_gem/gfggb.jpg i) Current I1 = 100kW / (480V x 0.7cosφ) = 100000/336=297.6A I2 = 50kW / (480V x 0.95cosφ) = 50000/456=109.6A ii) Apparent Power = 100kW = 480V x 297.6A = 142.85kVA = 50kW = 480V x 109.6A = 52.6kVA iii) Reactive Power ( kVAR = kW x tanφ ) = 100kW = 100 x 1.02 = 102kVAR = 50kW = 50 x 0.328 = 16.4kVAR iv) Capacitance 102 + 16.4 = 118.4kVAR v) Ic 118400/480=239.16A vi) Is 100+50=150kW 150000/480=312.5A vii) IL = √I1^2 + I2^2 = √88565.76 + 12012.16 = √100577.92 = 317.14A 希望幫到你 2010-05-01 18:24:03 補充： 如果你要我答多一題，不如問多一題啦，等我賺多幾分嘛，哈哈。 2010-05-01 18:27:04 補充： 對唔住先，冇注意到 I2 係 Capacitive Load 要改 2010-05-01 18:28:06 補充： 要全部重計 2010-05-01 18:29:35 補充： i) Current I1 = 100kW / (480V x 0.7cosφ) = 100000/336=297.6A I2 = 50kW / (480V x 0.95cosφ) = 50000/456=109.6A ii) Apparent Power = 100kW = 480V x 297.6A = 142.85kVA = 50kW = 480V x 109.6A = 52.6kVA 2010-05-01 18:33:08 補充： iii) Reactive Power ( kVAR = kW x tanφ ) = 100kW = 100 x 1.02 = 102kVAR = 50kW = 50 x 0.328 = 16.4kVAR iv) Capacitance 102 - 16.4 = 85.6kVAR 2010-05-01 18:34:10 補充： v) Ic 85600/480=178.33A 2010-05-01 18:34:42 補充： vi) Is 100+50=150kW 150000/480=312.5A

其他解答:E2A5F59BAA12C031
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