The generator is three-phase and four-wire (three fires and one zero), and the distribution cabinet is three-phase and five-wire (three fires and one zero). The power distribution cabinet from scratch). the fire is directly grounded.
If the distribution box and the generator are off, the distribution box and the generator must share the ground wire, that is, the generator shell, the generator box shell distribution and the zero line of the generator (neutral line) are connected at the same time, the ground wire of the distribution box is the same from the neutral line to the metal shell of the distribution box, so no generator is needed .
If the distribution cabinet is far from the generator, the distribution cabinet must be grounded according to regulations, as well as the distribution cabinet ground wire and the metal shell of the distribution cabinet.
Detailed information:
Notes:
380V/220V low voltage power distribution system can be divided into: IT system, TT system and TN system according to different protection. earthing system.
The electrical neutral point of a computer system is isolated or high impedance grounded, while the metal enclosure of electrical equipment is directly grounded. Namely: an electrical power system protected by earth, formerly called a three-phase, three-wire system.
The neutral point of the TT system power supply is directly grounded; the metal shell of the electrical equipment is also directly grounded, regardless of the neutral grounding of the power supply. Protective earthing in old three-phase four-wire power system.
The TN system is located in thee 380/220V three-phase four-wire low-voltage power grid. The neutral point of the transformer or generator is directly grounded, and the metal shell of the electrical equipment is not. charged during normal operation is connected to the neutral of the power supply via a common protection line. Click to log in. That is, no protection is provided for the old three-phase four-wire power system.
The neutral power point of the TN system is directly grounded and has an outgoing neutral wire. TN system is divided into TN-c system, TN-s system and TN-c-s system according to the shape of its protection line.
Generator generates electricity, neutral line is 220 volts to ground, switch to commercial power and return to normal
1 L The electricity generated by the generator can be used directly, but if you use precision instruments, it ist recommended to check whether the voltage and other parameters output by the generator meet the equipment requirements;
2 Generally, the generator has a star connection with three-phase outgoing wires, which is the wire energized that you mentioned, and there is also a The line coming out of the center point is what you call the neutral line;
3 It is recommended that the neutral The generator line be directly put to ground to ensure that: 1) the voltage of each phase live wire to ground is 220V, even if a live wire of one phase is grounded, the ground voltage will not increase at 380 V to ensure the safety of people and equipment;
4 If the neutral wire is not grounded, this does not mean that the live wire has no voltage at the earth, the voltage still exists, you can use an electric meter. Try ;
p>5 If the neutral line is not grounded, it existsyou always have a capacitance between the circuit and earth. Therefore, when a person comes into contact with a live wire, a capacitive current flows through the person. If the capacity of the generator is small, the external wiring If the circuit is short and the capacity is small, the capacitor current will be small, which will not cause personal accidents, but if the capacity is large enough, there will be personal danger;
6 If when you touch the live wire, the other phase live wire is grounded, the voltage on your body is 380V, just wait until you see God
The generator zero line to ground is 220V and mains power is used to return to normal.
1. Connect the neutral wire of the generator to the ground wire.
2. Connect the generator's 220 volt mains supply to the generator's 220 volt mains supply.
3. Connect the 220 volt ground wire from the generatorerator to the mains power supply to the earth wire.
4. Then connect the ground wire from the generator's 220 volts converted to utility power to the neutral line of the generator, and connect the generator load to the generator's 220 volts converted to utility power to return. to normal.