The use of household appliances, office equipment or industrial equipment in daily life, the vast majority of the power needed are from AC power supply, the use of AC power supply to provide power for these equipment. Alternating current (AC) is a type of electricity in which the magnitude and direction of the current change periodically. In addition, AC power can be supplied in single-phase power or three-phase power systems, depending on the application.

A single-phase AC power system consists of two wires, called phase (or sometimes wire or hot wire) and neutral wire. For a three-phase system, you use a three-wire or four-wire transmission power supply (there is no neutral wire in a three-wire three-phase power supply, and all three wires are phases). So, in the end what is single-phase and three-phase power, and what is the difference between the two?

Definition of single-phase power supply

Single-phase power supply usually refers to any phase line (commonly known as fire line)+ neutral line in 380V three-phase four-wire alternating current. The voltage is 220V, and the phase line will emit light when measured with ordinary low-voltage pen, while the neutral line will not emit light. It is the most common energy in daily life. A single phase is any one of the three phase lines to the zero line. Often called the "fire line", "zero line". Usually refers to 220V, 50Hz alternating current. Single-phase voltage is also called "phase voltage" in electrical engineering.

the definition of three-phase power supply

Three-phase power supply is a transmission form of electric energy, referred to as three-phase power. Three-phase AC power supply is composed of three AC potentials with the same frequency, equal amplitude and 120 degrees of phase difference in turn. There are many uses of three-phase alternating current. Most of the AC electrical equipment in industry, such as electric motors, use three-phase alternating current. And in daily life, the use of single-phase power supply, also known as lighting. When the use of lighting power supply, the use of three-phase electricity one of the phase power supply equipment, such as household appliances, and the other line is the fourth line in the three-phase four-wire system, which is the zero line, the zero line from the neutral point of three-phase power.

the difference between single-phase electricity and three-phase electricity

1. in the single-phase sinusoidal AC circuit, single-phase AC voltage, single-phase AC current and single-phase AC electromotive force are in accordance with the law of sinusoidal changes, can also be figuratively said, three-phase alternating current is the overall effect of three single-phase alternating current on the circuit.

2. three-phase alternating current has many advantages: the manufacture of three-phase alternator, transformer than single phase of material saving, and simple structure, excellent performance; When conveying the same amount of power under the same conditions, the three-phase transmission line can save 25% of non-ferrous metals and less energy loss than the single-phase transmission line. Three - phase motors have better performance than single - phase motors.

The above is all about single-phase and three-phase electricity to share, but also introduced the difference between single-phase electricity and three-phase electricity, after reading, I think you have a deeper understanding. Yufan micro provides ic wafer production and packaging customization, as a nine level agent, has more than 10 years of SCM chip application design experience, for the majority of electronic products manufacturers to provide MCU application function customization development services.