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Transformers are capable of receiving AC power at one voltage and delivering it at another voltage. In this way they help achieve better transmission efficiency, while transferring the power over longer distances. In this video we will go through the working and construction of a three-phase transformer, by starting from its simplest form. The basic working principle a transformer is simple, Electromagnetic induction. According to this principle a varying magnetic flux associated with the loop will induce an electromotive force across it. Such a fluctuating magnetic field can easily be produced by a coil and alternating EMF system. A current-carrying conductor produces a magnetic field around it. The magnetic field produced by a coil will be as shown in the figure. With the fluctuating nature of the alternating current, the magnetic field associated with the coil will also fluctuate. This magnetic flux can be effectively linked to a secondary winding, with the help of a core made up a ferromagnetic material. This fluctuating magnetic field will induce an EMF in the secondary coils due to electromagnetic induction. Since the turns are arranged in a series, the net EMF induced across the winding will be the sum of the individual Emfs induced in each turn. Since the same magnetic flux is passing through the primary and secondary coils, the EMF per turn for both the primary and secondary coils will be the same. The EMF per turn for the primary coil is related to the applied input voltage as shown. As a result the induced EMF at the secondary coil is expressed as follows: This simply means that with fewer turns in the secondary than in primary one can lower the voltage. For the reverse case one can increase the voltage. But since energy is conserved, the primary and secondary currents have to obey the following relationship: Three-phase transformers use three such single-phase transformers, but with a slightly different coil configuration. Here the primary and secondary coils sit concentrically. Two more such windings are employed in a three-phase transformer. Transformers with high power ratings generally employ a special kind of winding known as a Disc type winding, Where separate disk windings are connected in series through outer and inner crossovers. The low voltage windings are connected in a delta configuration. And the high voltage linings are connected in a star configuration. Thus, the line voltage further rises to 3×.5 times at high voltage side. This also means that, from a three-phase step up transformer we can draw four output wires, three-phase power wires and one neutral. High-voltage insulated bushings are required to bring out the electrical energy. The core of the transformer is made of thin insulated steel lamination. Such steel lamination are stacked together as shown to form a three-phase limb. The purpose of thin lamination is to reduce energy lost due to eddy current formation. The low voltage winding usually sit near the...
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