电压降（voltage drop）.doc

电压降（voltage drop） The estimation of voltage drop 1. uses the load torque on the line to estimate the voltage loss on the power line and checks the power supply quality of the line. 2. formulas proposed benchmark data an estimation of voltage loss, through some simple calculations, which can estimate the voltage loss on power supply line. Press loss according to kilowatt meter, 2.5 aluminium wire 20 - 1. The section increases, the load moment is large, and the voltage is lower than the square. Three phase, four wire, 6 times meter, copper wire multiply 1.7. The inductive load high pressure loss, under section 10 influence is small, in terms of rate 0.8, 10 increase from 0.2 to 1. 3.. The calculation of voltage loss is related to many factors, and the calculation is more complicated. When estimating, the line has selected the lead and the section according to the load situation, namely the related condition already basically has. The voltage loss is measured by a few percent of the rated voltage. The main list of formulas for voltage loss estimation the most basic data, the number of load moment voltage loss will be 1%. When the load moment is large, the voltage loss increases correspondingly. For some reason, the load moment of the line should be worked out first. The so-called load moment is the load (kw) multiplied by the length of the line (the length of the line is the length of the laying line of the guide line m, that is, the path of the traverse, irrespective of the number of wires leading to the line) The unit is kilowatt meter. For a radial line, the calculation of the load moment is simple. As shown in Figure 1, the load moment is 20*30=600 kW m.. But as the trunk line of Figure 2 is, it will be more troublesome. The load moment for the installation position of the 5 kW equipment shall be calculated from the line power supply point and divided into three segments according to the line branch. On the line every section, three load (10, 8, 5 kW) through, so l