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# Which line of main power supply for three-phase alternator

September 21, 2019

Which line of main power supply for three-phase alternator

Electricity is closely related to our work and life, and it is inseparable from the supply of electricity. A three-phase alternator generates a considerable part of the electric energy. The three phases are the three windings of the generator. The electrical angle between them is 120 degrees. The AC voltage generated by the three-phase generator is provided to our users. The following ways.

1. Direct connection power supply mode The method of directly connecting the power supply is to supply the power supply of each phase of the three sets of coils of the generator to our users by two wires. This kind of power supply requires a total of six power supply wires. If the power supply distance is long, it is not easy to use this method because the power supply cost is very high.

2, star connection power supply connects all three sets of coil ends of the generator and takes out a line. We call it the neutral line (n), the head end of the three sets of coils. Each leads a line. We call it the phase line. The three-phase lines are u phase line, the v phase line, and the w phase line. The three-phase lines are connected to separate users, while the neutral line is divided into three on the user side, and you can connect three users simultaneously. In this way, the voltages on the three sets of coils of the generator are provided to the respective users. In this power supply mode, the three sets of coils of the generator are connected in a star shape, and four wires are used to transmit the three-phase voltage, so we call it a three-phase four-wire star connection power supply mode.

3. Angle connection power supply mode uses the triangle connection power supply. The first ends of the three sets of coils of the generator are connected in turn, the connection mode is triangular, and one line u phase line is connected at each of the three connection points. This is because phase line, w phase line, connect these three lines with our users, the voltages on the three sets of coils are provided to their respective users. In this type of power supply, the three sets of coils of the generator are connected in a triangle, and three lines are used to transmit the three-phase voltage, so we call it a three-phase three-wire delta connection power supply.

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