The difference between three-phase three-wire electric energy meter and three-phase four-wire electric energy meter
Whether to use a three-phase three-wire system or a three-phase four-wire system is determined by the user's incoming line and the nature of electricity consumption. Now many people may not understand the difference between them. The following article will tell you about the three-phase three-wire system and the three-phase four-wire system. What is the meaning of the three-phase four-wire system, what are the differences, what are the different applications, what are the advantages of the three-phase three-wire system, the three-phase four-wire system, and the three-phase five-wire system, etc.
The difference between three-phase three-wire electric energy meter and three-phase four-wire electric energy meter
What is the meaning of three-phase three-wire system and three-phase four-wire system? What's the difference?
Whether to use a three-phase three-wire system or a three-phase four-wire system is determined by the user's incoming line and the nature of electricity consumption. If the user is a pure three-phase electrical appliance, such as a three-phase transformer, three-phase motor, etc., you can use a three-phase three-wire system. The three-phase three-wire system has only three wires and no neutral wire, so you can only use a three-phase three-wire system. If the user has a single-phase load and a three-phase load, it is a three-phase four-wire system or a three-phase five-wire system (multi-neutral grounding wire) line, and a three-phase four-wire system ammeter should be used. The three-phase three-wire line has no adjustment capability, and the three-phase load is required to be basically balanced.
What is the difference between three-phase three-wire system and three-phase four-wire system? What are the differences in application
Three-phase four-wire has one more power neutral wire than three-phase three-wire. Three-phase three-wire can only provide 380 volts of power, while three-phase four-wire can provide both 380 volts and 220 volts of power.
Three-phase three-wire, obviously saves money, but when the load is unbalanced, the zero-phase feedback current cannot pass through, and it is easy to burn things, and three-phase four-wire can solve this problem
What are the advantages of three-phase three-wire system, three-phase four-wire system and three-phase five-wire system?
The three-phase three-wire system uses only three phase wires
Three-phase four-wire system is three phase wires plus a neutral wire
The three-phase five-wire system is three phase wires plus a neutral wire plus a protective earth wire
What is the difference between three-phase three-wire and three-phase four-wire motors (power motors)?
The three-phase motor is a balanced load, the phase current is equal to the line current, and the vector sum is zero, so there is no need for a neutral line. The delta-connected motor has no neutral line to connect to, and the star connection can be connected to the neutral point. But it doesn't make sense, it's the same whether you pick it up or not.
