The three-phase four-wire connection method of the heater is that the voltage between two live wires is 380 volts, and the voltage between any live wire and the neutral wire can form 220 volts. 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 and one ground). After fire to fire and zero to zero, the ground wire of the distribution cabinet is directly connected to the ground wire.
Where is the 220 volt socket on the green J6P version?
Three-phase electricity is made up of four wires. Three live wires and one neutral wire. Three-phase alternating current is a form of electrical energy transmission, called three-phase energy. Three-phase AC power is a power supply consisting of three AC potentials with the same frequency, amplitude and phase differences of 120° from each other.
Three-phase alternating current has many uses. Most AC electrical equipment in industry, such as motors, uses three-phase AC, which is three-phase alternating current. often The three-phase four-wire system mentioned. In daily life, single-phase power supply, also called lighting power, is mainly used. When lighting electricity is used for power supply, one phase of the three-phase power supply is used to power electrical equipment, such as household appliances, and the other wire is the fourth wire among the three-phase wires to four wires, which is the neutral wire. The neutral line is drawn from the neutral point of three-phase electricity.
In the low-voltage distribution network, transmission lines generally adopt a three-phase four-wire system. The three lines respectively represent the three phasess A, B and C and are not divided. one is neutral line N (different from neutral line, in the single-phase transmission line entering the user, there are two lines, one is called live line and the other is called neutral line. Under normal circumstances, the neutral line must pass current to form a current loop in the single-phase line. In the three-phase system, the three phases form a circuit of their own, and the neutral line has no current. under normal circumstances), this is called a three-phase, four-wire system; in the 380 V low voltage distribution network, in order to obtain the 220 V line from the phase-phase voltage of 380 V.
In the ground wire
The generator has three phases and four wires (three fires and one zero), and the distribution cabinet has three phases and five wires (three fires and one zero). After the fire to pull from zero to zero, the ground wire of the armodistribution wire is directly connected to the ground wire. If the distribution cabinet and the generator are very close, the distribution cabinet and the generator should share a common ground wire, that is, the generator shell, the distribution cabinet shell and the generator zero line (neutral line) are all connected together. The cabinet ground wire is taken from the neutral line and from the metal shell of the distribution cabinet. There is no need to go to the generator to get it. If the distribution cabinet is far from the generator, the distribution cabinet must have an earthing body conforming to regulations and be connected to the earth wire of the distribution cabinet and the metal shell of the distribution cabinet. 380V/220V low voltage power distribution system can be divided into: IT system, TT system and TN system according to different grounding forms.e protection. The power neutral point of the computer system is isolated from ground or high impedance grounded, while the metal shell of the electrical equipment is directly grounded. That is to say: it used to be called the protective grounding of the three-phase three-wire power system. The neutral point of the TT system power supply is directly grounded; the metal shell of the electrical equipment is also directly grounded and has nothing to do with the grounding of the neutral point of the power supply. That is, the protective grounding of the previous three-phase four-wire power system. TN system, in transformerIn a three-phase four-wire 380/220 V low-voltage power network where the neutral point of the generator or generator is directly grounded, the metal shell of the electrical equipment that is not loaded during normal operation is directlyelectrically connected to neutral. power supply point across the public protection line. That is, the protection of the old three-phase four-wire power system was connected to zero. The neutral point of the TN system power supply is directly grounded and has an exiting neutral wire. According to its protection line form, the TN system is divided into three types: TN-C system, TN-S system and TN-C-S system. TN-C system (three-phase four-wire system), the neutral line (N) and protection line (PE) of this system are integrated, and this line is also called protected neutral line (PEN) line. Its advantage is that it saves one wire, but its disadvantage is that when the three-phase load is unbalanced or the protective neutral line is disconnected, the metal shell of all electrical equipment will be charged with dangerous voltage. The TN-S system is a three-phase, five-f systemthey. The N line and PE line of this system are separated and the five-wire power supply is used from the transformer. Its advantage is that no current flows through the PE line under normal circumstances, so it will not cause electromagnetic interference to other equipment connected to the PE line. In addition, since the N line is separated from the PE line, disconnecting the N line will not affect the protective effect of the PE line. TN-C-S system (three-phase four-wire and three-phase five-wire hybrid system), this system is a four-wire system from the transformer to the user distribution box. The neutral line and protective earth wire are integrated; the distribution box to the user. The neutral wire and protective earth wire are separated, so it has the characteristics of TN-C system and TN-S system. It is often used in places where the environment is at the end of the systemenergy distribution system. is poor or there are strict electromagnetic interference requirements.