If the main switch of the three-phase power supply is a leakage circuit breaker, a four-phase leakage circuit breaker must be used to operate the single-phase 220V power supply.
If a leakage circuit breaker Three-phase leakage is used, it cannot use a single phase for fire and zero. It can only use three phases of electricity, which means it can only use 380V electricity and. cannot use the neutral line.
A generator capable of producing electric potentials with equal amplitudes, equal frequencies and a phase difference of 120° from each other is called a three-phase generator. Using a three-phase generator as a power source is called three-phase power; a circuit powered by a three-phase power source is called a three-phase circuit.
Three-phase electrical meters include mechanical meters, electronic meters ordinaries and electronic counters with magnetic cards. General specifications are: 1.5(6), 5(20), 10(40), 15(60). , 20 (80), 30 (100) (voltage 3×380/220V~).
Detailed information:
The line drawn from the neutral point on the secondary side forms a loop with the phase line to power the electrical equipment. Normally, the neutral line is in the mains. secondary side of the transformer. The neutral point and ground wire are repeatedly grounded to provide double protection. The neutral line is mainly used in the working circuit.
Two-phase electricity only exists in single-phase motors. It is formed by dividing a single phase into two windings. For example, one winding does not have a capacitor in series and the other winding does. capacitor in series. The two windings The differencephase ence of the current is about 90°, which will generate a rotating magnetic field to operate the motor. The same single-phase power is supplied to the motor, with only one live wire, not two live wires.
Three-phase is the 380V phase-to-phase voltage between A.B.C. The electrical appliance is a 380V three-phase motor or equipment. The power generated by the generator is three-phase. Each phase of the three-phase power supply and its neutral point can form a single-phase loop to provide power to users. Note that it cannot be called positive or negative here in the AC circuit.
Baidu Encyclopedia - Three-phase electricity
The neutral wire and the ground wire are connected
Determine which wire should be the wire of earth based on the value you measured. If there is a virtual connection or the ground wire is broken, the voltage between the live wire and the ground wire should be d'approximately 220 volts.
Now this situation is equivalent to the absence of a protective ground wire. If the equipment leaks, the equipment shell will be charged if there is a leak protector installed at home, under normal circumstances, if there is a leak. leakage protection will activate.
You need to find the cause. You can check the voltage of the other outlets to see if the voltage between the live wire and the ground wire is around 220 volts. If everything else is normal, this may be the case. the binding post behind this jack. Ground wire is loose or broken. If there is a connector for the ground wire in the outlet box, check to see if the connector is loose.
Check carefully.
If you don't understand, keep asking.
I hope the answer can be useful to you.
Different power distribution systems are different.
The lineA commonly used power distribution system is the TN-S system. This system has four wires in front of the house (power distribution unit, such as unit or community), three are live wires and one. is a PEN wire, that is, the neutral point of the neutral line of the line combined into one is grounded. However, after entering and walking through the house, this line must be grounded. In the power distribution system, the PEN line is divided into a PE line and an N line (this becomes If the five wires (three fires, one zero and one ground) are removed, they can no longer be shared. To At this point, the neutral wire will be treated as a live electrode, although the current is usually very small
Since the neutral line and the live wire are a general leakage protector. pass through the coil, theoretically the leakage protection should trip ifthe neutral line leaks to earth. However, because the neutral current is usually very high. small, it does not reach the leakage protection working current, it will not jump.