HOW THREE-PHASE POWER WORKS

　   We are a professional technology company, Three-phase Energy Meter Test Bench

　   It is one of our products. Let me introduce the working principle of three-phase power supply to you.

　　The three-phase AC power supply is composed of three AC potentials with the same frequency, the same amplitude and the phase difference of 120 degrees from each other in turn, which is called a three-phase AC power supply. It is produced by a three-phase alternator. The single-phase AC power used in daily life is actually provided by one phase of the three-phase AC power, and the single-phase AC power supply from the single-phase generator has been rarely used.

　　After step-down and rectification, the three-phase alternating current is connected to the three terminals A, B and C, respectively. The two terminals of A and B are respectively limited and shaped by the resistors R1 and R2 and the Zener diodes VS1 and VS2, and then sent to the IC integrated circuit. 2 clock pulse signal terminals. If the phase sequence is correct (that is, positive pulses appear in the three-phase sequence of A, B, and C), both pins 1 and 13 of the IC integrated circuit output a high level, so that VT1 and VT2 are turned on, the relay K coil is energized, and K's The moving and closing contacts are closed, and the electrical equipment starts to work. At this time, the C terminal outputs a reset signal to the reset terminal of the IC integrated circuit through the resistor R3 and the voltage regulator VS3, and pins 1 and 13 output a low level. Since the capacitor C2 begins to discharge, the transistors VT1 and VT2 continue to be turned on. Keep the relay energized, the load works normally, and complete a cycle of three-phase alternating current changes. If the phase sequence is wrong, the pin 13 will keep the low level, the transistors VT1 and VT2 will be cut off, the coil of the relay K will lose power, the moving contact of K will be disconnected, and the electrical equipment will stop working.

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