商业综合楼施工用电方案#福建#框架结构#TNS系统供电#负荷确定计算#电流计算.doc

某某天城一期A组团施工用电方案编制人: 审核人： 批准人： 编制单位：某某建设有限责任公司编制日期：某某年12月28日 施工临时用电方案计算书 本工程由某某置业有限公司投资建设，福建省九龙建设集团设计院设计，荆门市规划勘测设计研究院地质勘察，福州市三利建设监理有限公司监理，某某建设集团有限公司组织施工；由严忠炎担任项目经理。 本工程为某某天城一期A组团工程，该工程为一个建筑群体（包括2#、3#、5#、6#、9#20#、34#、35#、地下车库二，商业综合楼等建筑），其中：2#、3#、5#、6#、8#11#楼八栋为框架地上五层住宅楼，12#19#楼为框架地上三层，半地下室一层连体别墅、商业综合楼为地上3层框架结构，34#、35#楼为地上12层框架结构，20#楼为地上二层框架结构，地下车库二为地下一层。总建筑面积为58168.94m2. 一、编制依据低压配电设计规范GB50054-95中国建筑工业出版社建筑工程施工现场供电安全规范GB50194-93中国建筑工业出版社通用用电设备配电设计规范GB50055-93中国建筑工业出版社供配电系统设计规范GB50052-95中国建筑工业出版社施工现场临时用电安全技术规范JGJ46-2005中国建筑工业出版社建筑施工安全检查标准JGJ59-99二、施工条件施工现场用电量统计表:-序号 机具名称 型号 安装功率(kW) 数量 合计功率(kW)1 塔式起重机1 QTZ5008 48 1 48 2 卷扬机1#楼 JJZ-1 7.5 1 7.5 3 卷扬机2#楼 JJZ-1 7.5 1 7.5 4 卷扬机5#楼 JJZ-1 7.5 1 7.5 5 卷扬机8#楼 JJZ-1 7.5 1 7.5 6 塔式起重机2 QTZ7 卷扬机9#楼 JJZ-1 7.5 1 7.5 8 卷扬机10#楼 JJZ-1 7.5 1 7.5 9 卷扬机11#楼 JJZ-1 7.5 1 7.5 10 卷扬机12#楼 JJZ-1 7.5 1 7.5 11 卷扬机13#楼 JJZ-1 7.5 1 7.5 12 钢筋调直机 GT6/14 3 1 3 13 钢筋切断机 QJ40 3 1 3 14 交流电焊机 76 1 76 15 钢筋弯曲机 GW40 3 2 6 16 木工圆锯 MJ106 5.5 2 11 17 插入式振动器 ZX70 1.5 8 12 18 平板式振动器 ZB11 1.1 4 4.4 19 平板式振动器 ZB11 1.1 10 11 20 插入式振动器 ZX70 1.5 5 7.5 21 高压镝灯 2 3 6 22 碘钨灯 1 30 30 23 荧光灯 0.04 30 1.2 24 钢筋调直机 GT3/9 3 1 3 25 钢筋切断机 QJ40 3 1 3 26 直流电焊机 AX5-27 钢筋弯曲机 WJ40 3 2 6 28 木工圆锯 MJ106 5.5 2 11 29 卷扬机14#、15#楼JJZ-1 7.5 1 7.5 30 卷扬机16#楼 JJZ-1 7.5 1 7.5 31 卷扬机17#、18#楼JJZ-1 7.5 1 7.5 32 卷扬机19#楼 JJZ-1 7.5 1 7.5 33 卷扬机20#楼 JJZ-1 7.5 1 7.5 34 交流电焊机 76 1 76 35 钢筋弯曲机 WJ40 3 2 6 36 钢筋调直机 GT6/14 3 1 3 37 木工圆锯 MJ106 5.5 2 11 38 钢筋切断机 QJ40 3 1 3 39 交流电焊机 76 1 76 40 钢筋调直机 GT6/14 3 1 3 41 钢筋切断机 QJ40 3 1 3 42 钢筋弯曲机 WJ40 3 2 6 43 木工圆锯 MJ106 5.5 2 11 44 钢筋弯曲机 WJ40 3 2 6 45 直流电焊机 AX5-46 钢筋调直机 GT6/14 3 1 3 47 钢筋切断机 QJ40 3 1 3 48 木工圆锯 MJ106 5.5 2 11 49 平板式振动器 ZB11 1.1 6 6.6 50 插入式振动器 ZX70 1.5 6 9 51 插入式振动器 ZX70 1.5 12 18 52 平板式振动器 ZB11 1.1 12 13.2 53 平板式振动器 ZB11 1.1 10 11 54 插入式振动器 ZX70 1.5 10 15 55 碘钨灯 1 6 6 56 荧光灯 0.04 20 0.8 57 高压镝灯 3.5 10 35 -三、设计内容和步骤1、现场勘探及初步设计:(1)本工程所在施工现场范围内施工前无各种埋地管线。(2)现场采用380V低压供电，设一配电总箱，内有计量设备，采用TN-S系统供电。(3)根据施工现场用电设备布置情况，总箱进线采用导线空气明敷/架空线路敷设，干线采用空气明敷/架空线路敷设，用电器导线采用空气明敷/架空线路敷设。布置位置及线路走向参见临时配电系统图及现场平面图，采用三级配电，二级防护。(4)按照JGJ46-2005规定制定施工组织设计，接地电阻R4。2、确定用电负荷:(1)、塔式起重机Kx = 0.7 Cos = 0.6 tg = 1.33将Jc =40%统一换算到Jc1 =25%的额定容量Pn = 48kWPe = n×(Jc/Jc1)1/2×Pn = 1×(0.4/0.25)1/2×48 = 60.72 kWPjs = Kx×Pe =0.7×60.72 = 42.504kWQjs = Pjs× tg=42.504×1.33 = 56.53 kvar(2)、卷扬机1楼Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 = 5.25 kWQjs = Pjs× tg=5.25×1.33 =6.98 kvar(3)、卷扬机2楼Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 = 5.25 kWQjs = Pjs× tg=5.25×1.33 = 6.98 kvar(4)、卷扬机5楼Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 = 5.25 kWQjs = Pjs× tg=5.25×1.33 =6.98 kvar(5)、卷扬机8楼Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 = 5.25 kWQjs = Pjs× tg=5.25×1.33 = 6.98 kvar(6)、塔式起重机2Kx = 0.7 Cos = 0.6 tg = 1.33将Jc =40%统一换算到Jc1 =25%的额定容量Pn = 48kWPe = n×(Jc/Jc1)1/2×Pn = 1×(0.4/0.25)1/2×48 = 60.72 kWPjs = Kx×Pe =0.7×60.72 = 42.504kWQjs = Pjs× tg=42.504×1.33 = 56.53 kvar(7)、卷扬机9楼Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 = 5.25 kWQjs = Pjs× tg=5.25×1.33 = 6.98 kvar(8)、卷扬机10楼Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 = 5.25 kWQjs = Pjs× tg=5.25×1.33 =6.98kvar(9)、卷扬机11楼Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 = 5.25 kWQjs = Pjs× tg=5.25×1.33 =6.98 kvar(10)、卷扬机12楼Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 = 5.25 kWQjs = Pjs× tg=5.25×1.33 =6.98 kvar(11)、卷扬机13楼Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 = 5.25 kWQjs = Pjs× tg=5.25×1.33 = 6.98 kvar(12)、钢筋调直机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×11 = 7.15 kWQjs = Pjs× tg=7.15×1.02 = 7.29 kvar(13)、钢筋切断机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×7 = 4.55 kWQjs = Pjs× tg=4.55×1.02 = 4.64 kvar(14)、交流电焊机Kx = 0.5 Cos = 0.4 tg = 2.29将Jc =50%统一换算到Jc1 =100%的额定容量Pn = Sn ×Cos = 76×0.4=30.4kWPe = n×(Jc/Jc1)1/2×Pn = 1×(0.5/1)1/2×30.4 = 21.5 kWPjs = Kx×Pe =0.5×21.5 = 10.75kWQjs = Pjs× tg=10.75×2.29 = 24.63 kvar(15)、钢筋弯曲机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×6 = 3.9 kWQjs = Pjs× tg=3.9×1.02 = 3.98 kvar(16)、木工圆锯Kx = 0.65 Cos = 0.6 tg = 1.33Pjs = 0.65×11 = 7.15 kWQjs = Pjs× tg=7.15×1.33 = 9.53 kvar(17)、插入式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×12 = 3.6 kWQjs = Pjs× tg=3.6×1.02 = 3.67 kvar(18)、平板式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×4.4 = 1.32 kWQjs = Pjs× tg=1.32×1.02 = 1.35 kvar(19)、平板式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×11 = 3.3 kWQjs = Pjs× tg=3.3×1.02 = 3.37 kvar(20)、插入式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×7.5 = 2.25 kWQjs = Pjs× tg=2.25×1.02 = 2.3 kvar(21)、高压汞灯Kx = 0.6 Cos = 0.7 tg = 1.02Pjs = 0.6×15×1.1 = 9.9 kWQjs = Pjs× tg=9.9×1.02 = 10.1 kvar(22)、碘钨灯Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×30×1 = 9 kWQjs = Pjs× tg=9×1.02 = 9.18 kvar(23)、荧光灯Kx = 0.2 Cos = 0.8 tg = 0.75Pjs = 0.2×6×1.2 = 1.44 kWQjs = Pjs× tg=1.44×0.75 = 1.08 kvar(24)、钢筋调直机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×7.5 = 4.875 kWQjs = Pjs× tg=4.88×1.02 = 4.97 kvar(25)、钢筋切断机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×7 = 4.55 kWQjs = Pjs× tg=4.55×1.02 = 4.64 kvar(26)、直流电焊机Kx = 0.7 Cos = 0.6 tg = 1.33将Jc =50%统一换算到Jc1 =100%的额定容量Pn = 26kWPe = n×(Jc/Jc1)1/2×Pn = 1×(0.5/1)1/2×26 = 18.38 kWPjs = Kx×Pe =0.7×18.38 = 12.87kWQjs = Pjs× tg=12.87×1.33 = 17.16 kvar(27)、钢筋弯曲机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×6 = 3.9 kWQjs = Pjs× tg=3.9×1.02 = 3.98 kvar(28)、木工圆锯Kx = 0.65 Cos = 0.6 tg = 1.33Pjs = 0.65×11 = 7.15 kWQjs = Pjs× tg=7.15×1.33 = 9.53 kvar(30)、卷扬机14、15楼Kx = 0.3 Cos = 0.6 tg = 1.33Pjs = 0.3×7.5 = 2.25 kWQjs = Pjs× tg=2.25×1.33 = 3 kvar(31)、卷扬机16楼Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 = 5.25 kWQjs = Pjs× tg=5.25×1.33 = 6.98 kvar (33)、卷扬机17、18楼Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 = 5.25 kWQjs = Pjs× tg=5.25×1.33 = 6.98 kvar(34)、卷扬机19Kx = 0.7 Cos = 0.6 tg = 1.33Pjs = 0.7×7.5 =5.25 kWQjs = Pjs× tg=5.25×1.33 = 6.98 kvar(35)、交流电焊机Kx = 0.5 Cos = 0.4 tg = 2.29将Jc =50%统一换算到Jc1 =100%的额定容量Pn = Sn ×Cos = 76×0.4=30.4kWPe = n×(Jc/Jc1)1/2×Pn = 1×(0.5/1)1/2×30.4 = 21.5 kWPjs = Kx×Pe =0.5×21.5 = 10.75kWQjs = Pjs× tg=10.75×2.29 = 24.63 kvar(36)、钢筋弯曲机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×6 = 3.9 kWQjs = Pjs× tg=3.9×1.02 = 3.98 kvar(37)、钢筋调直机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×11 = 7.15 kWQjs = Pjs× tg=7.15×1.02 = 7.29 kvar(38)、木工圆锯Kx = 0.65 Cos = 0.6 tg = 1.33Pjs = 0.65×11 = 7.15 kWQjs = Pjs× tg=7.15×1.33 = 9.53 kvar(39)、钢筋切断机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×7 = 4.55 kWQjs = Pjs× tg=4.55×1.02 = 4.64 kvar(40)、交流电焊机Kx = 0.3 Cos = 0.4 tg = 2.29将Jc =50%统一换算到Jc1 =100%的额定容量Pn = Sn ×Cos = 76×0.4=30.4kWPe = n×(Jc/Jc1)1/2×Pn = 1×(0.5/1)1/2×30.4 = 21.5 kWPjs = Kx×Pe =0.3×21.5 = 6.45kWQjs = Pjs× tg=6.45×2.29 = 14.78 kvar(41)、钢筋调直机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×11 = 7.15 kWQjs = Pjs× tg=7.15×1.02 = 7.29 kvar(42)、钢筋切断机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×7 = 4.55 kWQjs = Pjs× tg=4.55×1.02 = 4.64 kvar(43)、钢筋弯曲机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×6 = 3.9 kWQjs = Pjs× tg=3.9×1.02 = 3.98 kvar(44)、木工圆锯Kx = 0.65 Cos = 0.6 tg = 1.33Pjs = 0.65×11 = 7.15 kWQjs = Pjs× tg=7.15×1.33 = 9.53 kvar(45)、钢筋弯曲机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×6 = 3.9 kWQjs = Pjs× tg=3.9×1.02 = 3.98 kvar(46)、直流电焊机Kx = 0.7 Cos = 0.3 tg = 3.18将Jc =50%统一换算到Jc1 =100%的额定容量Pn = 26kWPe = n×(Jc/Jc1)1/2×Pn = 1×(0.5/1)1/2×26 = 18.38 kWPjs = Kx×Pe =0.7×18.38 = 12.87kWQjs = Pjs× tg=12.87×3.18 = 40.92 kvar(47)、钢筋调直机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×11 = 7.15 kWQjs = Pjs× tg=7.15×1.02 = 7.29 kvar(48)、钢筋切断机Kx = 0.65 Cos = 0.7 tg = 1.02Pjs = 0.65×7 = 4.55 kWQjs = Pjs× tg=4.55×1.02 = 4.64 kvar(49)、木工圆锯Kx = 0.65 Cos = 0.6 tg = 1.33Pjs = 0.65×11 = 7.15 kWQjs = Pjs× tg=7.15×1.33 = 9.53 kvar(50)、平板式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×6.6 = 1.98 kWQjs = Pjs× tg=1.98×1.02 = 2.02 kvar(51)、插入式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×9 = 2.7 kWQjs = Pjs× tg=2.7×1.02 = 2.75 kvar(52)、插入式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×18 = 5.4 kWQjs = Pjs× tg=5.4×1.02 = 5.51 kvar(53)、平板式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×13.2 = 3.96 kWQjs = Pjs× tg=3.96×1.02 = 4.04 kvar(54)、平板式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×11 = 3.3 kWQjs = Pjs× tg=3.3×1.02 = 3.37 kvar(55)、插入式振动器Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×15 = 4.5 kWQjs = Pjs× tg=4.5×1.02 = 4.59 kvar(56)、碘钨灯Kx = 0.3 Cos = 0.7 tg = 1.02Pjs = 0.3×6×1 = 1.8 kWQjs = Pjs× tg=1.8×1.02 = 1.84 kvar(57)、荧光灯Kx = 0.2 Cos = 0.8 tg = 0.75Pjs = 0.2×4×1.2 = 0.96 kWQjs = Pjs× tg=0.96×0.75 = 0.72 kvar(58)、高压汞灯Kx = 0.6 Cos = 0.7 tg = 1.02Pjs = 0.6×45×1.1 = 29.7 kWQjs = Pjs× tg=29.7×1.02 = 30.3 kvar(59)总的计算负荷计算，总箱同期系数取 Kx = 0.4总的有功功率Pjs = Kx×Pjs = 0.4×(42.504+5.25+5.25+5.25+5.25+42.504+5.25+5.25+5.25+5.25+5.25+7.15+4.55+10.75+3.9+7.15+3.6+1.32+3.3+2.25+9.9+9+1.44+4.88+4.55+12.87+3.9+7.15+2.25+2.25+2.25+2.25+2.25+10.75+3.9+7.15+7.15+4.55+6.45+7.15+4.55+3.9+7.15+3.9+12.87+7.15+4.55+7.15+1.98+2.7+5.4+3.96+3.3+4.5+1.8+0.96+29.7) = 157.515 kW总的无功功率Qjs = Kx×Qjs =0.4×(56.53+6.98+6.98+6.98+6.98+56.53+6.98+6.98+6.98+6.98+6.98+7.29+4.64+24.63+3.98+9.53+3.67+1.35+3.37+2.3+10.1+9.18+1.08+4.97+4.64+17.16+3.98+9.53+6.98+6.98+6.98+6.98+6.98+24.63+3.98+7.29+9.53+4.64+14.78+7.29+4.64+3.98+9.53+3.98+40.92+7.29+4.64+9.53+2.02+2.75+5.51+4.04+3.37+4.59+1.84+0.72+30.3) = 217.572 kvar总的视在功率Sjs = ( Pjs2+Qjs2 )1/2 = (157.5152+217.5722)1/2 = 268.605 kVA总的计算电流计算Ijs = Sjs/(1.732×Ue) = 268.605/(1.732×0.38) = 408.115 A3、配电室1线路上导线截面及分配箱、开关箱内电气设备选择:在选择前应对照平面图和系统图先由用电设备至开关箱计算，再由开关箱至分配箱计算，选择导线及开关设备。分配箱至开关箱，开关箱至用电设备的导线敷设采用铝橡皮绝缘导线空气明敷/架空线路，室外架空铝导线按机械强度的最小截面为16mm2。(1)、塔式起重机开关箱至塔式起重机导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ijs = Kx ×Pe /(1.732×Ue ×Cos) = 1×60.72/(1.732×0.38×0.6) = 153.75Aii)选择导线选择BLX-4×95 ，空气明敷/架空线路时其安全载流量为265A。室外架空铝芯导线按机械强度的最小截面为16mm2，满足要求。iii)选择电气设备选择开关箱内隔离开关为DZ10-250/3 ，其脱扣器整定电流值为Ir = 200A，漏电保护器为 DZ10L-250/3。(2)、卷扬机1开关箱至卷扬机导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ijs = Kx ×Pe /(1.732×Ue ×Cos) = 1×7.5/(1.732×0.38×0.6) = 18.99Aii)选择导线选择XLF-4×16 ，空气明敷/架空线路时其安全载流量为64A。室外架空铝芯导线按机械强度的最小截面为16mm2，满足要求。iii)选择电气设备选择开关箱内隔离开关为DZ5-50/3 ，其脱扣器整定电流值为Ir = 40A，漏电保护器为 DZ15L-100/30。(3)、卷扬机2楼开关箱至卷扬机2楼导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ijs = Kx ×Pe /(1.732×Ue ×Cos) = 1×7.5/(1.732×0.38×0.6) = 18.99Aii)选择导线选择XLF-4×16 ，空气明敷/架空线路时其安全载流量为64A。室外架空铝芯导线按机械强度的最小截面为16mm2，满足要求。iii)选择电气设备选择开关箱内隔离开关为DZ5-50/3 ，其脱扣器整定电流值为Ir = 40A，漏电保护器为 DZ15L-100/30。(4)、卷扬机5楼开关箱至卷扬机5楼导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ijs = Kx ×Pe /(1.732×Ue ×Cos) = 1×7.5/(1.732×0.38×0.6) = 18.99Aii)选择导线选择XLF-4×16 ，空气明敷/架空线路时其安全载流量为64A。室外架空铝芯导线按机械强度的最小截面为16mm2，满足要求。iii)选择电气设备选择开关箱内隔离开关为DZ5-50/3 ，其脱扣器整定电流值为Ir = 40A，漏电保护器为 DZ15L-100/30。(5)、卷扬机5楼开关箱至卷扬机5楼导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ijs = Kx ×Pe /(1.732×Ue ×Cos) = 1×7.5/(1.732×0.38×0.6) = 18.99Aii)选择导线选择XLF-4×16 ，空气明敷/架空线路时其安全载流量为64A。室外架空铝芯导线按机械强度的最小截面为16mm2，满足要求。iii)选择电气设备选择开关箱内隔离开关为DZ5-50/3 ，其脱扣器整定电流值为Ir = 40A，漏电保护器为 DZ15L-100/30。(6)、塔式起重机2开关箱至塔式起重机2导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ijs = Kx ×Pe /(1.732×Ue ×Cos) = 1×60.72/(1.732×0.38×0.6) = 153.75Aii)选择导线选择BLX-4×95 ，空气明敷/架空线路时其安全载流量为265A。室外架空铝芯导线按机械强度的最小截面为16mm2，满足要求。iii)选择电气设备选择开关箱内隔离开关为DZ10-250/3 ，其脱扣器整定电流值为Ir = 200A，漏电保护器为 DZ10L-250/3。(7)、卷扬机8楼开关箱至卷扬机8楼导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ijs = Kx ×Pe /(1.732×Ue ×Cos) = 1×7.5/(1.732×0.38×0.6) = 18.99Aii)选择导线选择XLF-4×16 ，空气明敷/架空线路时其安全载流量为64A。室外架空铝芯导线按机械强度的最小截面为16mm2，满足要求。iii)选择电气设备选择开关箱内隔离开关为DZ5-50/3 ，其脱扣器整定电流值为Ir = 40A，漏电保护器为 DZ15L-100/30。(8)、卷扬机9楼开关箱至卷扬机9楼导线截面及开关箱内电气设备选择（开关箱以下用电器启动后需要系数取1）:i)计算电流Kx = 1 Cos = 0.6 tg = 1.33Ijs = Kx ×Pe /(1.732×Ue ×Cos) = 1×7.5/(1.732×0.38×0.6) = 18.99Aii)选择导线选择XLF-4×16 ，空气明敷/架空线路时其安全载流量为64A。室外架空铝芯导线按机械