工程常用临时用电的变压器计算书

1、工程变压器计算书1、主要设备表:序号机具名称型号安装功率(kW)数量合计功率(kW)1钢筋调直切断机YGT6/12141142钢筋切断机GQ403263钢筋弯曲机GW403134钢筋弯箍机JW403265交流电焊机UN-100761766碘钨灯1447插入式振动机1.5468平板式振动机1.534.59木工电锯2.537.510抽水机5.5316.511碘钨灯14412建筑施工电梯SC200/2003313313塔式起重机QTZ63(C5013)3213214混凝土搅拌机1511515生活用电3013016静压桩机12011202、确定用电负荷：(1) 、钢筋调直切断机Kx=065, Cos

2、© =0.7 , tg © =1.02Pjs=0.65 X 14=9.1kWQjs=PjsX tg © =9.1 x 1.02=9.28kvar(2) 、钢筋切断机Kx=0.65， Cos© =0.7 ， tg © =1.02Pjs=0.65 x 6=3.9kWQjs=Pjsx tg © =3.9 x 1.02=3.98kvar(3) 、钢筋弯曲机Kx=0.65， Cos© =0.7 ， tg © =1.02Pjs=0.65 x 3=1.95kWQjs=Pjsx tg © =1.95 x 1.02=1.9

3、9kvar(4) 、钢筋弯箍机Kx=0.65， Cos© =0.7 ， tg © =1.02Pjs=0.65 x 6=3.9kWQjs=Pjsx tg © =3.9 x 1.02=3.98kvar(5) 、交流电焊机Kx=0.5，Cos© =0.4 ， tg © =2.29将d=50%统一换算到di =100%的额定容量Pn=Snx Cos© =76x 0.4=30.4kWPe=nx (Jc/Jc1)1/2 x Pn =1 x (0.5/1)1/2x 30.4=21.5 kWPjs=KxxPe=0.5 x 21.5=10.75kWQj

4、s=Pjsx tg © =10.75 x 2.29=24.63kvar(6) 、碘钨灯Kx=0.3，Cos© =0.7 ，tg © =1.02Pjs=0.3 X 4 X 1=1.2kWQjs=PjsX tg © =1.2 X 1.02=1.22kvar(7) 、插入式振动机Kx=0.3， Cos© =70，. tg © =012.Pjs=0.3X6=1.8kWQjs=PjsX tg ©1=.8X 1.02=1.84kvar(8) 、平板式振动机Kx=0.3， Cos© =70，. tg © =012.Pj

5、s=0.3X4.5=1.35kWQjs=PjsX tg ©1=.35X 1.02=1.38kvar(9) 、木工电锯Kx=0.65， Cos © =705.， tg ©0=.88Pjs=0.65X 7.5=4.88kWQjs=PjsX tg ©4=.88X 0.88=4.29kvar(10) 、抽水机Kx=0.5，Cos© =0.6 ，tg © =1.33Pjs=0.5X16.5=8.25kWQjs=PjsX tg ©8=.25X 1.33=10.98kvar(11) 、碘钨灯Kx=0.3，Cos© =0.7 ，t

6、g © =1.02Pjs=0.3 X 4X 1=1.2kWQjs=PjsX tg © =1.2 X 1.02=1.22kvar(12) 、建筑施工电梯Kx=0.85, Cos © =0.6 , tg © =1.33Pjs=0.85 X 33=28.05kWQjs=PjsX tg © =28.05 X 1.33=37.4kvar(13) 、塔式起重机Kx=0.85， Cos© =0.6 ， tg © =1.33将JC=40%统一换算到丄=25%的额定容量Pn=32kWPe=nX (Jc/Jc1)1/2XPn =1 X (0.4

7、/0.25)1/2X 32=40.48 kWPjs=K xXPe=0.85 X 40.48=34.41kWQjs=PjsX tg © =34.41 X 1.33=45.87kvar(14) 、混凝土搅拌机Kx=0.75， Cos© =0.85 ， tg © =0.62Pjs=0.75 X 15=11.25kWQjs=PjsX tg © =11.25 X 0.62=6.97kvar(15) 、生活用电Kx=0.75， Cos© =805.， tg ©0=.62Pjs=0.75X 30=22.5kWQjs=PjsX tg ©2=

8、2.5X 0.62=13.95kvar( 1 6)、静压桩机Kx=0.85， Cos© =60，. tg ©1=.33Pjs=0.85X 120=102kWQjs=PjsX tg (W2X 0.6=135.66kvar(17)总的计算负荷计算，总箱同期系数取 Kx=0.65总的有功功率Pjs=Kx XZPjs=0.65 X (9.1+3.9+1.95+3.9+10.75+1.2.8+1.35+4.88+8.25+1.2+28.05+34.41+11.25+22.5+102)=160.22kW总的无功功率Qjs=KxX 艺Qjs=0.65 X (9.28+3.98+1.99+3.98+24.63+1.2284+1.38+4.29+10.98+1.22+37.4+45.87+6.97+13.95+135.66)=198.02kvar总的视在功率Sjs=(Pjs2+Q js2)1/2=(1 60.222+1 98.022)1/2=254.72kVA总的计算电流计算Ijs=Sjs/(1 .732 Xe)U=254.72/(1.732X 0.388)=73.02A