Electricity is a vector, it has a physical quantity of direction and size. The three-phase coils of the alternator stator are symmetrically arranged at an electrical angle of 120 degrees. Our daily electricity is powered by the distribution transformer. The secondary side of the transformer is star-connected. It has three live wires (ABC three phase lines respectively) and works at the neutral point to connect to zero. The line is the zero line. Line voltage and phase voltage vector We call the voltage of two different phases (hot line) the line voltage, and the voltage of the phase (hot line) and the neutral line is called the phase voltage. We can see from the vector diagram of the line voltage that one line is 220V and the two lines are 380V. This should start from the national conditions of China, because the voltage level of residential electricity in China should be 220/380V. Then why are the two FireWires 380V and the single roots 220V? Look at the following: 1. Source of electrical energy Electricity is usually emitted by generators (of course, new energy sources such as solar power, wind power, etc.) are then raised by the power plant's step-up transformer to the grid's specified voltage level. After being sent to the load center, the voltage of the grid is reduced to a voltage level suitable for the user through a step-down transformer, which is 380V (the actual transformer secondary side voltage is 0.4kV, because the line loss voltage drop is considered). This will come out 380V, the specific process of production, transformation, and transportation is shown in the following figure: 2, the formation of 380V voltage From the above figure, we see that the transformer T3 is a user terminal transformer. This transformer reduces the primary voltage to the residential power voltage level and leads the PEN line on the secondary side of the transformer, which is what we often call the neutral line. With this PEN line, you can form a three-phase four-wire power supply. This is the four lines (three phase lines and one PEN line) that we often see on the poles of the village. So why go to each household? After that, the four lines became three lines. Why is it 220V? Look at the picture below: 3, the formation of 220V voltage We often say that 380V refers to the phase voltage between the three phase lines of ABC (L1 L2 L3) on the graph, and the voltage (UA0, UB0, UC0) of each relative (0 point) is 220V. Since the distribution of each of our households is designed according to single-phase power distribution (local lord, large household 380V power distribution), our voltage is a single-phase voltage of 220V, which is the phase in the above figure (L1 or L2) Or L3 vs. PEN line) voltage to the PEN line. (If the PEN is repeatedly grounded before entering the household, and the N line and the PE line are separated, then the household electricity becomes the TN-CS system, so we will see that the original two lines become 3 lines). LV Intelligent Capacitor Bank Controller WGK-31 series LV Intelligent Capacitor Bank controller is used for SFR-L and SFR-M series power capacitor bank. They are used for correcting power factor and compensation reactive power. They can be combined with power quality monitoring device to achieve the professional control and management of power quality. Lv Intelligent Capacitor Bank Controller,3P Compensation Capacitor Controller,3 Phase Compensation Capacitor Controller,Pfc Capacitor Bank Controller Jiangsu Sfere Electric Co., Ltd , https://www.elecnova-global.com
