Three-phase power supplyConnection method 3: The sequence of live wires is yellow, green and red.
** represents phase A, green represents phase B and red represents phase C. The order of these three colors must be memorized as an electrician, just like remember that the live wire for single-phase alternating current is red, and three colors must be remembered for three-phase electricity. In fact, the order of these three colors. is very easy to remember.
The delta connection method is to connect each phase power supply or load end to end in sequence, and output each connected point as three-phase lines of three-phase electricity.
Three-phase alternating current has three live wires, so they must be distinguished. The three live wires are called phase A, phase B and phase C. But all three are live wires.How do you know which is phase A or phase B? In order to distinguish this, three colors are used to represent phases A, B and C respectively. ** represents phase A, green represents phase B and red represents phase C.
As as an electrician, you need to remember the order of these three colors, just like remembering that the live wire of single-phase AC power is red, and you need to remember three colors for three-phase power. In fact, these three colors The order is very easy to remember, yellow, green and red. Anyway, I remember it that way, and I'm never wrong. Of course, if you don't like it, you can too. use your own method to remember it.
Advantages of three-phase electrical connection:
Line voltage is the voltage between the live wire and the live wire. This connection method eliminates one problem. wire neutre, does the absence of neutral line also mean that there is no phase voltage? This statement is incorrect. You can say there is no neutral line, but that doesn't mean there is no phase voltage. You can only say that the phase voltage and other line voltages are equal. Because there are windings inside the motor, the voltage of each phase coil is the phase voltage, so even if there is no neutral line, the phase voltage still exists, and we can see that the phase voltage has nothing to do with whether or not there is a neutral line. is a neutral line.
How to connect 220 V electrical appliances when the generator output is only three-phase live wire
The structure of the three-phase winding of the stator of the generator is symmetrical and has six output terminals U1, U2, V1, V2, W1, W2 (i.e. phase head and tail A, phasehead and tail of phase B and head and tail of phase C of the three phases A, B and C) are placed in the junction box outside the machine base. Connect them in a star (Y) or triangle (△) shape as needed, as shown in the figure below.
The triangular wiring connects W2 and U1, U2 and V1, V2 and W1 respectively, and the outgoing wires U1, V1 and W1 are connected to the three-phase external wiring A, B and C respectively. .
The star connection connects the three terminals W2, U2 and V2 together, and the output terminals U1, V1 and W1 are connected to the three-phase external wiring A, B and C respectively.
Detailed information:
1.Angle connection:
Connect the end of each phase of the three-phase power supply or load to the beginning of the next phase, then bring out the fthey terminals of the three connection points.
Each phase of the three-phase load in a delta connection is connected between two terminal wires, and the phase voltage of the load is equal to the line voltage of the three-phase power supply.
In a circuit with delta-connected loads, since each phase load is connected between two phase lines, the phase voltage of the load is the line voltage of the power supply (network) , i.e. U1 = Up.
2. Star connection:
Star connection is a wiring method for three-phase AC power and three-phase electrical appliances. Connect the ends of the three windings of the three-phase power supply, X, Y and Z, to form a common point O, and draw three terminal lines from the starting ends A, B and C.
Three sinusoidal power supplies with the same frequency, same amplitude and 120° phase difference soundt connected in some way to the external power system. ?
Baidu Encyclopedia - three-phase asynchronous motor
Baidu Encyclopedia - triangle connection
Baidu Encyclopedia - star connection
If you only use 220V, connect the live wire to the live wire and the neutral wire to the neutral wire, there will definitely be no problem.
If you also use a 380 three-phase motor V, pay attention to the order of the phases to avoid inversion.
p>The most important thing is to avoid your generator being connected to the transformer wires. There must be insulation measures between the two. a dedicated dual power switch.