1、2.1现场布置施工现场用电由东西两侧两台315KV的变压器引入,施工现场分为东西两个区,两个区各单独设置一个一级配电箱,生活区、办公区均不在施工现场及附近,本次设计只考虑施工现场用电,由于装修时大部分大功率电器已离场,以东区用电量负荷较大一侧计算进行设计。2. 2有关技术参数1、总箱参数用电接驳方式由变压器接入总配电箱编号总箱 A总配电箱距接驳点布线距离Lo(m)80总配电箱的同期使用系数Kx0.8分配电箱数量9导线线芯材料铜线总配电箱进线敷设方式空气明敷/架空线路分配电箱进线敷设方式设备电线敷设方式干线允许电压降%52、分箱参数3、用电设备参数4、临电设备计算及配置3、初步设计(1)施工现场
2、临时用电安全技术规范(JGJ46-2005)总则中以强制性条文规定,施工现场必须采用三级配电系统、必须采用TN-S接零保护系统。(2)现场采用380V低压供电,设一配电总箱,采用TN-S系统供电。(3)布置位置及线路走向参见临时配电系统图,采用三级配电,三级防护。(4)按照JGJ46-2005规定制定施工组织设计,接地电阻R4。(5)按照JGJ46-2005规定若为架空线路则“根据机械强度要求,绝缘铜线截面不小于10mm2,绝缘铝线截面不小于16mm2”。4、用电负荷1、1号分箱设备用电负荷(1)塔吊Kx = 0.25,Cos = 0.5,tg = (1 - Cos2)0.5/ Cos = (
3、1 - 0.52)0.5 / 0.5 = 1.73Pe = n P (e/)0.5 = 1.00 50.00 (0.25 / 1.00)0.5 = 25.00kWIj1 = Kx Pe / (1.732 Ue cos) = 0.25 25.00 1000 / (1.732 380 0.50) = 18.99APjs = Kx Pe = 0.25 25.00 = 6.25kWQjs = Pjs tg = 6.25 1.73 = 10.83kvA(2)1号分箱计算负荷用电设备同期使用系数Kx=0.80;Ijs = Kx Pe / (1.732 Cos) = 0.80 0.75) = 40.52A;
4、同时要求分箱用电负荷不得小于分箱下用电设备最大计算负荷的1.1倍,故:Ijs = max40.52,1.1max(18.99,) = 40.52A2、2号分箱设备用电负荷Kx = 0.35,Cos = 0.35,tg = (1 - Cos2)0.5/ Cos = (1 - 0.352)0.5 / 0.35 = 2.68 (0.60 / 1.00)0.5 = 38.73kW cos) = 0.35 38.73 0.35) = 58.85A Pe = 0.35 38.73 = 13.56kW tg = 13.56 2.68 = 36.28kvA(2)2号分箱计算负荷 0.75) = 62.77A;
5、Ijs = max62.77,1.1max(58.85,) = 64.73A3、3号分箱设备用电负荷Kx = 0.6,Cos = 0.7,tg = (1 - Cos2)0.5/ Cos = (1 - 0.72)0.5 / 0.7 = 1.02 (1.00 / 1.00)0.5 = 50.00kW cos) = 0.60 0.70) = 65.12A Pe = 0.60 50.00 = 30.00kW tg = 30.00 1.02 = 30.61kvA(2)3号分箱计算负荷 0.75) = 81.03A;Ijs = max81.03,1.1max(65.12,) = 81.03A4、4号分箱设
6、备用电负荷(1)插入式混凝土振捣器Kx = 0.7,Cos = 0.7,tg = (1 - Cos2)0.5/ Cos = (1 - 0.72)0.5 / 0.7 = 1.02 (e/)0.5 = 3.00 1.50 (0.40 / 0.40)0.5 = 4.50kW cos) = 0.70 4.50 0.70) = 6.84A Pe = 0.70 4.50 = 3.15kW tg = 3.15 1.02 = 3.21kvA(2)镝灯 (e/)0.5 = 2.00 3.00 (0.40 / 0.40)0.5 = 6.00kW 6.00 0.70) = 7.81A 6.00 = 3.60kW t
7、g = 3.60 1.02 = 3.67kvA(3)4号分箱计算负荷 10.50 0.75) = 17.02A;Ijs = max17.02,1.1max(6.84,7.81,) = 17.02A5、5号分箱设备用电负荷(3)5号分箱计算负荷6、6号分箱设备用电负荷(3)6号分箱计算负荷7、7号分箱设备用电负荷(1)切割机Kx = 0.7,Cos = 0.6,tg = (1 - Cos2)0.5/ Cos = (1 - 0.62)0.5 / 0.6 = 1.33 2.20 (0.50 / 1.00)0.5 = 3.11kW 3.11 0.60) = 5.52A 3.11 = 2.18kW tg
8、 = 2.18 1.33 = 2.90kvA(2)直流电焊机 (e/)0.5 = 4.00 (0.50 / 1.00)0.5 = 16.97kW 16.97 0.60) = 30.08A 16.97 = 11.88kW tg = 11.88 1.33 = 15.84kvA(3)7号分箱计算负荷 20.08 0.75) = 32.55A;Ijs = max32.55,1.1max(5.52,30.08,) = 33.09A8、8号分箱设备用电负荷(1)数控钢筋调直切断机Kx = 0.2,Cos = 0.65,tg = (1 - Cos2)0.5/ Cos = (1 - 0.652)0.5 / 0
9、.65 = 1.17 9.50 (0.40 / 0.40)0.5 = 9.50kW cos) = 0.20 0.65) = 4.44A Pe = 0.20 9.50 = 1.90kW tg = 1.90 1.17 = 2.22kvA(2)钢筋切断机Kx = 0.65,Cos = 0.7,tg = (1 - Cos2)0.5/ Cos = (1 - 0.72)0.5 / 0.7 = 1.02 5.50 (0.40 / 0.40)0.5 = 11.00kW cos) = 0.65 11.00 0.70) = 15.52A Pe = 0.65 11.00 = 7.15kW tg = 7.15 1.0
10、2 = 7.29kvA(3)钢筋弯曲机 0.65) = 5.14A 11.00 = 2.20kW tg = 2.20 1.17 = 2.57kvA(4)直螺纹套丝机 (0.40 / 0.40)0.5 = 4.40kW 4.40 0.65) = 2.06A 4.40 = 0.88kW tg = 0.88 1.17 = 1.03kvA(5)木压刨板机Kx = 0.65,Cos = 0.6,tg = (1 - Cos2)0.5/ Cos = (1 - 0.62)0.5 / 0.6 = 1.33 (0.40 / 0.40)0.5 = 3.00kW 0.60) = 4.94A 3.00 = 1.95kW tg = 1.95 1.33 = 2.60kvA(6)木工圆锯(7)木工平刨床(8)8号分箱计算负荷 44.90 0.75) = 72.77A;Ijs = max72.77,1.1max(4.44,15.52,5.14,2.06,4.94,4.94,4.94,) = 72.77A9、9号分箱设备用电负荷(1)钢筋切断机(2)钢筋弯曲机(3)直螺纹套丝机 0.70) = 6.21A 4.40 = 2.86kW tg = 2.86 1.02 = 2.92kvA(4)数控钢筋调直切断机 9.50 = 1.
copyright@ 2008-2022 冰豆网网站版权所有
经营许可证编号:鄂ICP备2022015515号-1