某機(jī)床廠的負(fù)荷計算以及功率補(bǔ)償分析案例計算機(jī)床廠的負(fù)荷(1)1#變電所①辦公樓:cosPQSI②工具車間:PQSI③倉庫:PQSI④熱處理車間:cosPQSI(2)2#變電所①門衛(wèi):cosPQSI②實驗室:cosPQSI③模型車間:cosPQSI④鑄造車間:cosPQSI⑤鍋爐房:cosPQSI(3)3#變電所①裝配車間:PQSI②金工車間:cosPQSI③鍛壓車間:cosPQSI(4)4#變電所①生活區(qū):cosPQSI②開關(guān)設(shè)備:cosPQSI③機(jī)修車間:cosPQSI④電鍍車間:cosPQSI

為方便審核，將上述計算數(shù)據(jù)繪制整理成三線表，如下圖2-1所示。表2-1建始市機(jī)床廠降壓變電站用電負(fù)荷統(tǒng)計序號車間名稱設(shè)備容量(Kw)預(yù)設(shè)參數(shù)負(fù)荷計算KcostanP30Q30S30I301#變電所辦公樓1550.80.610.5712470.68203.28308.85工具車間2140.30.681.1364.273.194.41143.44倉庫200.270.840.595.433.246.469.81熱處理車間3750.540.71.03202.5208.58289.29439.53小計396.13355.6593.44901.632#變電所門衛(wèi)1010.651.331013.315.3823.37實驗室2400.460.80.76110.483.9138209.67模型車間1000.360.810.553619.844.4467.52鑄造車間3100.340.61.31105.4138.07175.67266.9鍋爐房700.50.790.773526.9544.367.31小計296.8282.02417.79634.773#變電所裝配車間2700.280.71.0175.676.36108164.09金工車間鍛壓車間4503100.210.340.620.631.311.1994.5105.4123.8125.43152.42167.3231.58254.18小計275.5325.59427.72649.854#變電所生活區(qū)700.670.780.5546.925.860.1291.34開關(guān)設(shè)備800.340.741.0227.227.7436.7755.87機(jī)修車間1550.230.591.3735.6548.8460.4291.8電鍍車間2650.450.880.62119.2573.94135.51205.89小計229176.32292.82444.9

2.2無功功率補(bǔ)償2.2.11#變電所的無功補(bǔ)償①補(bǔ)償前:K∑p=0.9K∑q=0.95故PQSI因此初選擇SC9?500/10型式的變壓器。即cos按照規(guī)定cosφ≥0.9則Q采用BWF0.4?20?3型式的并聯(lián)電容器，Un=②補(bǔ)償后:SI30.Ι=cosΔΔPQSIcosφ選擇主變壓器的型式為SC9?400/10型，SN=400kV.A，補(bǔ)償前后數(shù)據(jù)如表2-2所示:表2-21#車變的負(fù)荷統(tǒng)計項目cos計算負(fù)荷變壓器臺數(shù)及容量(KV.A)PQS30/kV.AI380V側(cè)補(bǔ)償前負(fù)荷0.73356.52337.82491.15746.231×SC9-400/10無功功率補(bǔ)償容量-200380V側(cè)補(bǔ)償后負(fù)荷0.93356.52137.82382.23580.74主變壓器的功率損耗5.7319.1110KV側(cè)負(fù)荷總計0.92362.25156.93394.7822.79(2)2#變電所的無功補(bǔ)償①補(bǔ)償前:K∑p=0.9K∑q=0.95∑P30.i=296.8kW故P30QSI因此初選擇SC9?400/10型式的變壓器。即cos按照規(guī)定cosφ≥0.9則Q采用BWF0.4?20?3型式的并聯(lián)電容器，UNn=②補(bǔ)償后:SIQcosΔΔPQSIcosφ選擇主變壓器的型式為SC9?315/10，SN=315kV.A，補(bǔ)償前后數(shù)據(jù)如表2-3所示:表2-32#車變的負(fù)荷統(tǒng)計(3)3#變電所的無功補(bǔ)償①補(bǔ)償前:K∑p=0.9K∑q=0.95∑故PQSI因此初選擇SC9?400/10型式的變壓器。cosφ=PQ采用BWF0.4?20?3型式的并聯(lián)電容器，Un=②補(bǔ)償后:SIQcosΔΔQSIcosφ選擇主變壓器的型式為SC9?315/10，SN=315kV.A，補(bǔ)償前后數(shù)據(jù)如表2-4所示: 表2-43#車變的負(fù)荷統(tǒng)計 (4)4#變電所的無功補(bǔ)償①補(bǔ)償前:K∑p=0.9K∑q=0.95∑故PQSI因此初選擇SC9?315/10型式的變壓器。