【正文】 = Pjs = 4 = kW Qjs = Pjs tgφ = = kvar (17)、鋼筋彎曲機(jī) Kx = Cosφ = tgφ = Pjs = 6 = kW Qjs = Pjs tgφ = = kvar (18)、鋼筋切斷機(jī) Kx = Cosφ = tgφ = Pjs = 6 = kW Qjs = Pjs tgφ = = kvar (19)、直流電焊機(jī) Kx = Cosφ = tgφ = 將 Jc =50%統(tǒng)一換算到 Jc1 =100%的額定容量 Pn = 6kW Pe = n (Jc/Jc1)1/2 Pn = 1 ()1/2 6 = kW Pjs = Kx Pe = = Qjs = Pjs tgφ = = kvar (20)、白熾燈 Kx = 1 Cosφ = 1 tgφ = 0 Pjs = 1 1 = kW Qjs = Pjs tgφ = 0 = 0 kvar (21)、木工圓鋸 Kx = Cosφ = tgφ = Pjs = 6 = kW Qjs = Pjs tgφ = = kvar (22)、白熾燈 Kx = 1 Cosφ = 1 tgφ = 0 Pjs = 1 1 = kW Qjs = Pjs tgφ = 0 = 0 kvar (23)、塔式起重機(jī) Kx = Cosφ = tgφ = 將 Jc =40%統(tǒng)一換算到 Jc1 =25%的額定容量 Pn = 48kW Pe = n (Jc/Jc1)1/2 Pn = 1 ()1/2 48 = kW Pjs = Kx Pe = = Qjs = Pjs tgφ = = kvar (24)、混凝土輸送泵 Kx = Cosφ = tgφ = Pjs = = kW Qjs = Pjs tgφ = = kvar (25)、插入式振動(dòng)器 Kx = Cosφ = tgφ = Pjs = = kW Qjs = Pjs tgφ = = kvar (26)、高壓汞燈 Kx = Cosφ = tgφ = Pjs = 2 = kW Qjs = Pjs tgφ = = kvar (27)、白熾燈 Kx = 1 Cosφ = 1 tgφ = 0 Pjs = 1 1 = kW Qjs = Pjs tgφ = 0 = 0 kvar (28)、塔式起重機(jī) Kx = Cosφ = tgφ = 將 Jc =40%統(tǒng)一換算到 Jc1 =25%的額定容量 Pn = 48kW Pe = n (Jc/Jc1)1/2 Pn = 1 ()1/2 48 = kW Pjs = Kx Pe = = Qjs = Pjs tgφ = = kvar (29)、混凝土輸送泵 Kx = Cosφ = tgφ = Pjs = = kW Qjs = Pjs tgφ = = kvar (30)、插入式振動(dòng)器 Kx = Cosφ = tgφ = Pjs = = kW Qjs = Pjs tgφ = = kvar (31)、高壓汞燈 Kx = Cosφ = tgφ = Pjs = 2 = kW Qjs = Pjs tgφ = = kvar (32)、白熾燈 Kx = 1 Cosφ = 1 tgφ = 0 Pjs = 1 1 = kW Qjs = Pjs tgφ = 0 = 0 kvar (33)、鋼筋調(diào)直機(jī) Kx = Cosφ = tgφ = Pjs = 4 = kW Qjs = Pjs tgφ = = kvar (34)、鋼筋彎曲機(jī) Kx = Cosφ = tgφ = Pjs = 6 = kW Qjs = Pjs tgφ = = kvar (35)、鋼筋切斷機(jī) Kx = Cosφ = tgφ = Pjs = 6 = kW Qjs = Pjs tgφ = = kvar (36)、直流電焊機(jī) Kx = Cosφ = tgφ = 將 Jc =50%統(tǒng)一換算到 Jc1 =100%的額定容量 Pn = 6kW Pe = n (Jc/Jc1)1/2 Pn = 1 ()1/2 6 = kW Pjs = Kx Pe = = Qjs = Pjs tgφ = = kvar (37)、白熾燈 Kx = 1 Cosφ = 1 tgφ = 0 Pjs = 1 1 = kW Qjs = Pjs tgφ = 0 = 0 kvar (38)、木工圓鋸 Kx = Cosφ = tgφ = Pjs = 6 = kW Qjs = Pjs tgφ = = kvar (39)、白熾燈 Kx = 1 Cosφ = 1 tgφ = 0 Pjs = 1 1 = kW Qjs = Pjs tgφ = 0 = 0 kvar (40)、白熾燈 Kx = 1 Cosφ = 1 tgφ = 0 Pjs = 1 40 1 = 40 kW Qjs = Pjs tgφ =40 0 = 0 kvar (41)總的計(jì)算負(fù)荷計(jì)算，總箱同期系數(shù)取 Kx = 總的有功功率 Pjs = Kx Σ Pjs = (+++++++++++++++++++++++++++++++++3.9++++++40) = kW 總的無功功率 Qjs = Kx Σ Qjs = (++++0+++++0+++++0+++++0++0+++++0+++++0++++3.96+0++0+0) = kvar 總的視在功 率 Sjs = ( Pjs2+Qjs2 )1/2 = (+)1/2 = kVA 總的計(jì)算電流計(jì)算 Ijs = Sjs/( Ue) = ( ) = A 10 號樓、 15 號樓干線線路上導(dǎo)線截面及分配箱、開關(guān)箱內(nèi)電氣設(shè)備選擇 : 在選擇前應(yīng)對照平面圖和系統(tǒng)圖先由用電設(shè)備至開關(guān)箱計(jì)算，再由開關(guān)箱至分配箱計(jì)算，選擇導(dǎo)線及開關(guān)設(shè)備。 (1)、塔式起重機(jī)開關(guān)箱至塔式起重機(jī)導(dǎo)線截面及開關(guān)箱內(nèi)電氣設(shè)備選擇（開關(guān)箱以下用電器啟動(dòng)后需要系數(shù)取 1） : i)計(jì)算電流 Kx = 1 Cosφ = tgφ = Ijs = Kx Pe /( Ue Cosφ ) = 1 ( ) = ii)選擇 導(dǎo)線 選擇 XV4 50 ，空氣明敷 /架空線路時(shí)其安全載流量為 158A。 iii)選擇電氣設(shè)備 選擇開關(guān)箱內(nèi)隔離開關(guān)為 DZ10250/3 ，其脫扣器整定電流值為 Ir = 200A，漏電保護(hù)器為 DZ10L250/3。室外架空銅芯導(dǎo)線按機(jī)械強(qiáng)度的最小截面為 10mm2，滿足要求。 (3)、插入式振動(dòng)器開關(guān)箱至插入式振動(dòng)器導(dǎo)線截面及開關(guān)箱內(nèi)電氣設(shè)備選擇（開關(guān)箱以下用電器啟動(dòng)后需要系數(shù)取 1） : i)計(jì)算電流 Kx = 1 Cosφ = tgφ = Ijs = Kx Pe /( Ue Cosφ ) = 1 ( ) = ii)選擇導(dǎo)線 選擇 XV4 10 ，空氣明敷 /架空線路時(shí)其安全載流量為 57A。 iii)選擇電氣設(shè)備 由于開關(guān)控制 2 臺用電器，開關(guān)的電流為 Ir= (臺數(shù) )= A。 (4)、高壓汞燈開關(guān)箱至高壓汞燈導(dǎo)線截面及開關(guān)箱內(nèi)電氣設(shè)備選擇（開關(guān)箱以下用電器啟動(dòng)后需要系數(shù)取 1） : i)計(jì)算電流 Kx = 1 Cosφ = tgφ = Ijs = Kx Pe /(Ue Cosφ ) = 1 1/( ) = ii)選擇導(dǎo)線 選擇 XV4 10 ，空氣明敷 /架空線路時(shí)其安全載流量為 57A。 iii)選擇電氣設(shè)備 由于開關(guān)控制 2 臺用電器，開關(guān)的電流為 Ir= (臺數(shù) )= A。 (5)、白熾燈開關(guān)箱至白熾燈導(dǎo)線截面及開關(guān)箱內(nèi)電氣設(shè)備選擇（開關(guān)箱以下用電器啟動(dòng)后需要系數(shù)取 1） : i)計(jì)算電流 Kx = 1 Cosφ = 1 tgφ = 0 Ijs = Kx Pe /(Ue Cosφ ) = 1 ( 1) = ii)選擇導(dǎo)線 選擇 XV4 10 ，空氣明敷 /架空線路時(shí)其安全載流量為 57A。 iii)選擇電氣設(shè)備 由于開關(guān)控制 5 臺用電器，開關(guān)的電流為 Ir= (臺數(shù) )= A。 (6)、 1 號動(dòng)力分箱至第 1 組電機(jī) (塔式起重機(jī)、混凝土輸送泵 )的開關(guān)箱的導(dǎo)線截面及分配箱內(nèi)開關(guān)的選擇 i) 計(jì)算電流 塔式起重機(jī) Kx = Cosφ = tgφ = Ijs = Kx Pe 臺數(shù) /( Ue Cosφ ) = 1/( ) = 混凝土輸送泵 Kx = Cosφ = tgφ = Ijs= Kx Pe 臺數(shù) /( Ue Cosφ ) = 1/( ) = Ijs(1 組電機(jī) )= 該組中最大的開關(guān)箱電流 Ijs= 由于該組下有多個(gè)開關(guān)箱，所以最大電流需要乘以 的系數(shù) 兩者中取大值 Ijs= = ii)選擇導(dǎo)線 選擇 XV4 70 ，空氣明敷 /架空線路時(shí)其安全載流量為 191A。 (7)、 2 號動(dòng)力分箱至 第 1 組電機(jī) (插入式振動(dòng)器 )的開關(guān)箱的導(dǎo)線截面及分配箱內(nèi)開關(guān)的選擇 i) 計(jì)算電流 插入式振動(dòng)器 Kx = Cosφ = tgφ = Ijs= Kx Pe 臺數(shù) /( Ue Cosφ ) = 2/( ) = Ijs(1 組電機(jī) )= 該組中最大的開關(guān)箱電流 Ijs= 兩者中取大值 Ijs= ii)選擇導(dǎo)線 選擇 XV4 70 ，空氣明敷 /架空線路時(shí)其安全載流量為 191A。 (8)、 3 號照明分箱至第 1 組照明燈具 (高壓汞燈、白熾燈 )的開關(guān)箱的導(dǎo)線截面及分配箱內(nèi)開關(guān)的選擇 i) 計(jì)算電流 高壓汞燈 Kx = Cosφ = tgφ = Ijs = Kx Pe 臺數(shù) /(Ue Cosφ ) = 1 2/( ) = 白熾燈 Kx = 1 Cosφ = 1 tgφ = 0 Ijs = Kx Pe 臺數(shù) /(Ue Cosφ ) = 1 5/( 1) = Ijs(1 組燈具 )= 該組中最大的開關(guān)箱電流 Ijs= 由于該組下