Three-phase alternating current is a form of transmission of electrical energy, referred to as three-phase electricity. The three-phase AC power supply is a power supply composed of three alternating current potentials of the same frequency, equal amplitude, and phase difference of 120°. There are many uses for three-phase alternating current. Most of the AC electrical equipment in the industry, such as electric motors, use three-phase alternating current, which is the three-phase four-wire system often mentioned. In daily life, a single-phase power source is also used, which is also called lighting power. When the lighting power supply is used, one of the three-phase electricity is used to supply power to the electric device, such as a household appliance, and the other wire is the fourth wire among the three-phase four wires, that is, the neutral wire therein. The neutral line is drawn from the neutral point of the three-phase power.
The concept of "three-phase electricity" is that when the coil is rotated in a magnetic field, the magnetic flux of the wire is cut to generate an induced electromotive force, and its variation can be expressed by a sinusoid. If we take three coils and they are 120 degrees apart from each other in space, the three coils still rotate at the same speed in the magnetic field, and three induced induced electromotive forces are induced in the coil. Since the three coils are at a 120-degree difference from each other in the spatial position, the generated current is also a three-phase sinusoidal change called a three-phase sinusoidal alternating current.
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The voltage between the phase and the phase is called the line voltage, and the voltage between any two phases is 380V. The voltage between the phase and the neutral point is called the phase voltage, and the voltage at any relative neutral point is 220V. (Three-phase AC power has 660V and 6000V power supply depending on the application).
A generator capable of generating equal amplitudes, equal frequencies, and 120° phase differences is called a three-phase generator. A three-phase generator is used as a power source, which is called a three-phase power source; a circuit that is powered by a three-phase power source is called a three-phase circuit.
The color A phase of the three-phase electricity is yellow, the B phase is green, and the C phase is red. Currently, there are several types: A, B, C or L1, L2, L3 or U, V, W, and the order is the same. of.
The total power of the three-phase electrical appliance is equal to the voltage per phase multiplied by the current per phase and multiplied by the root number 3, ie the total power = current × voltage (220V) × √ 3 (p = U × I × √ 3)
The three-phase electric meter has three types: mechanical watch, ordinary electronic watch, and magnetic card electronic watch. The general specifications are: 1.5 (6), 5 (20), 10 (40), 15 (60), 20 (80), 30 (100) ) (Voltage 3 × 380 / 220V ~).
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