What are single-phase and three-phase power supplies?
A single phase is a line of fire that uses only 3 phases, and the other uses a zero line. The voltage is 220V, that is, the 3 wire of the 3 phase, the voltage at the zero line, is 220V.A single phase power supply can also be formed by using any of the 3 phases of the FireWire and zero lines (neutral lines)
Also called the three-phase AC three-phase power supply, power system is composed of three same frequency, amplitude, phase difference is equal to the potential difference between the AC circuit angle of 120 degrees. Due to the use of materials composed of electrical equipment at the same time the use of three-phase alternating current of the province, the lowest manufacturing cost and effectiveness of the use of the maximum, so the production and distribution in China are three-phase alternating current.
Only a single AC voltage in the circuit, the current generated in the circuit, the voltage in a certain frequency change with time, an alternating electromotive force produced only in the coil, e=Emsin. T this is AC single-phase AC is single-phase power supply.
