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Three-phase Transformer Working Principle



Three-phase transformers are a combination of three identical single-phase transformers. There are three core columns, three-phase power is to produce the same amplitude, frequency equal to 120 degrees potential difference between each phase of the generator called the three-phase generator; three-phase generator as the power supply, known as the three-phase power; three Phase power supply circuit, known as the three-phase circuit. U, V, W is called three-phase, the voltage between the phase and the phase is the line voltage, the voltage is 380V. Between the phase and the center line is called the phase voltage, the voltage is 220V.

A three-phase transformer is a device that converts AC voltage, current and impedance. When the primary coil passes an AC current, an AC magnetic flux is generated in the core (or magnetic core) to induce a voltage (or current) in the secondary coil. . Transformer consists of a core (or core) and a coil, the coil has two or more windings, which is connected to the power supply called the primary winding coil, the remaining winding is called the secondary coil.

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The basic working principle of the transformer is the principle of electromagnetic induction. When the AC voltage is applied to the primary winding, an AC current flows into the winding to generate an excitation, and an alternating magnetic flux is generated in the core. The alternating magnetic flux not only passes through the primary winding but also passes through the secondary winding , Which respectively induce induced electromotive force in the two windings. At this time, if the load on the secondary side and the external circuit is turned on, AC current flows out, so that the power is output.

Three-phase transformer products are widely used in industrial and mining enterprises, textile machinery, printing and packaging, petrochemicals, schools, shopping malls, elevators, telecommunications, medical machinery, office equipment, test equipment, industrial automation equipment, household appliances, high-rise buildings, machine tools, tunnels Transmission and distribution and import equipment, all need to ensure the normal voltage of the occasion.


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