The circuit used in daily life is mainly composed of a combination of live wire, ground wire, and zero wire.


Live wire is used for electrification, and the color of the wire is generally red, which is the main power line; The zero wire is used to form a current circuit, and the color of the wire is generally blue; Ground wire, also known as lightning wire, is used to protect circuits, and the wire is generally yellow. In a group of circuits, the live wire provides voltage and current through the zero wire, forming a complete circuit to ensure the normal use of the electrical equipment.


And single-phase electricity, as the name suggests, has only one phase wire, and its wire is composed of a live wire and a neutral wire;


Three phase electricity has three phase wires, including three live wires and one neutral wire, which is also known as three phase four wire.


The main difference between the two is that the AC voltage is different. Single-phase electricity is 220V, mainly used for household electricity or office computers, while three-phase electricity is 380V, which has advantages in power generation, energy conversion, and other aspects. It is generally used for power distribution or higher power equipment, such as industrial scenarios.


Single phase electricity and three-phase electricity can be converted into each other:


*Extracting a live wire and a neutral wire from a three-phase wire can convert it into three-phase electricity, as the voltage of either live wire or neutral wire is 220V.


*If single-phase electricity needs to be converted into single-phase electricity, the voltage needs to be increased, which can be achieved through inverters or unidirectional frequency converters to convert the AC 220V voltage into the AC 380V voltage.


The new energy vehicle charging station is mainly used to charge new energy vehicles, and there are two charging methods - slow charging and fast charging.


Slow charging generally uses household 220V single-phase electricity. When car owners buy new energy vehicles, the charging station provided by the manufacturer generally adopts slow charging method. A 220V AC charging station typically has a power of around 7kw, which means that after charging for one hour, it can charge up to 7 kilowatts of electricity.


The most common slow charging methods include car mounted chargers and household wall mounted charging stations.


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