如图（a)所示是小明设计的电子秤原理图，其中E为由两节干电池串联组成的电源，V是电压表，R0是阻值为5Ω的定值电

55kw离心水泵怎么设计配电系统

急 翻译！ 不要用翻译软件译的 谢谢

如图（a)所示是小明设计的电子秤原理图，其中E为由两节干电池串联组成的电源，V是电压表，R0是阻值为5Ω的定值电

1）

电压表示数最大时，电路的电流

I=U/(R0+R)=3V÷(5Ω+10Ω)=0.2A

电压表最大示数

Uv=IR=0.2A×10Ω=2V

2）

电压表示数1V时，R0电压

U0'=U-Uv'=3V-1V=2V

串联电压与电阻成正比，电阻丝接入电路的阻值

R'：R0=Uv'：U0'=1V：2V=1：2

R'=0.5R0=2.5Ω

此时弹簧缩短了

2.5Ω：10Ω=Δx：6cm

Δx=1.5cm

查表得，物体的重

G=15N

重物的质量

m=G/g=1.5Kg

3）

偏大，因为测得的示数代表塑料盘和物体的质量之和

55kw离心水泵怎么设计配电系统

55KW的水泵，380V，每台额定电流在100A左右，200米以内，进线选YJV22-3*70+1*35的电缆，采用星三角降压启动，配电箱到电机出线选2*YJV22-3*25+1*16的电缆，如果是软启动和变频启动时出线选。

（如果说负载是长期工作，环境温度较高，供电距离在300-800米进线选95平方的）

YJV22-3*35+1*16，如有配管或桥架就用YJV的电缆。

主开关选择D系列，框架电流300A，整定到250A，分开关选择D系列，框架电流160A，整定到125A。

急 翻译！ 不要用翻译软件译的 谢谢

sintering burdening is the vital step of realizing the blast furnace production. During sinter burdening, different types of iron bearing material (hematite), solvent(limestone powder,dolomite powder,ground quick lime ), bunker(coke powder) and so on are precisely proportioned in a certain matching in accordance with the process of sinter burdening and the requirements of blast furnace, so that the needed chemicals and sinter of physical property can be obtained. The quality of the proportioning techniques, and the veracity of proportioning accuracy control directly affect the quantity and quality of the sinter. This design is mainly based on the background of the sinter burdening proportioning process in the metal industry to design a auto control system for the process.Firstly, the working procedure of sinter burdening proportioning was introduced and the overall control plan was designed; then logical control system and continuous control system was developed, there into logical control system includes the start and stop of the disk, and belt scale; continuous control system includes the flow control of dolomite powder,ground quick lime ,and bunker