Use a 220V test pen to check accuracy. The international convention for a three-core socket is zero on the left, fire on the right, and ground in the middle. The four-conductor one has three-phase electricity, the bottom three are three live wires, and the top-middle one is usually a ground wire. There are also three fire connections and one zero connection. You can use an electric pen to detect live wires. The range of a multimeter should be greater than 380 V. The voltage between two live wires is about 380 V and the voltage between zero live wires is about 220 V. If the motor driven by the output turns at upside down, simply swap two live wires. Remember to turn off the power and pay attention to safety.
If the outlet is marked, L1L2L3 is the live wire, N is the neutral wire, and if there is an E, it is the ground wire.
Place a card and a prifive pin with three lights, a zero and a ground wire.
How to convert three-phase 380 V electricity into two-phase 220 V electricity? Is there such a portable transformer?
Conversion of three-phase electricity into two? -In-phase electrical connection method:
1. Distribute three-phase power evenly to the upper ends of all two-phase air switches. That is to say, in order, the first two-phase pneumatic switch is connected to the yellow phase, the second is connected to the green phase, the third is connected to the red phase, and so on.
2. The total input neutral line is connected to the neutral line, then the neutral lines of all other branches are connected from the neutral line. In this way, the three phases under the three-phase air switch are evenly distributed.
3. The colors of three-phase electricity: phase A is **, phase B is verte and phase C is red. There are several methods of labeling: yellow, green and red correspond to the label. names A, B, C or L1 respectively L2, L3 or U, V, W.
The principle of the motor alternator
There is a rotor (rotating magnetic field) driven by the motor inside the generator. There is an underwinding outside the magnetic field. The winding has 3 sets of coils (3-phase windings), and the 3-phase windings are spaced at an electrical angle of 120° from each other.
As the rotor rotates, the rotating magnetic field causes the fixed stator winding to cut the magnetic lines of force (or change the magnetic flux through the electromotive force winding) to generate the force electromotive that the electric coil can generate, and the flux of the coil. The force and rotation speed of the magnetic pole are positive
Detailed informationlleys:
Three-phase alternating current is a form of power transmission. The three-phase AC power supply consists of three AC potentials with the same frequency, same amplitude and a phase difference of 120 degrees.
In low-voltage distribution networks, transmission lines generally adopt a three-phase four-wire system. Three of the lines are three-phase A, B and C, which are not divided. is the neutral line N, so it is called a three-phase four-wire system.
The difference between three-phase power and single-phase power: Single-phase is 220 volts, which is the voltage between the phase line and neutral line. The three-phase alternating voltage is 380 V between phases. The electrical devices are three-phase 380 V motors or equipment.
The power supply to the generator is three-phase. Each phase of the three-phase power supply and the neutral point canent form a single-phase circuit to supply the users.
Baidu Encyclopedia - Three-phase electricity
Your statement is not correct. What do you mean by “two phases of 220V”? The common 220V mains power supply is called single-phase power supply, which has a live wire (normally it should be called phase wire) and a neutral wire. Why use a “portable transformer” when it is available everywhere?
The real "two-phase 220V" means that the voltage between the two live wires is 220V, and there is a neutral point, with a total of three wires. Do you really need this type of electricity?
Such a "two-phase 220V" can be connected to a three-phase transformer from a three-phase four-wire supply, with a neutral point, and can have secondary windings, such as a winding around A and B. On the phase, it is not necessary, just bring it out directlytaking the windings of phases A and B as two live wires, and passing the neutral point as the neutral line, thus forming a true "two". phases of 220 V". The phase voltages are phase shifted by 120 degrees.
A true "two-phase 220V" can also be obtained by a more complex multi-phase transformer, and the phase difference is below other angles This is rare and used for special purposes.
For your reference
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