The generation of electric power is three-phase in nature and the generated voltage is 13.2kV, 22kV or higher. Transmission of power is carried out at high voltages like 132kV or 400kV. Before transmission, it is required to step-up the voltage and for this a thee phase step-up transformer is required. Similarly, at the distribution sub-station
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The ordinary or commercial efficiency of a transformer is defined as the ratio of output power to the input power. [latex] \% \text { of Commerical Efficiency }=\frac{\text { Output Power }}{\text { Input Power }} \times 100 \wedge [/latex] There are certain types of transformers whose performance can not be judged by this efficiency.
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Rating of a Transformer The name plate of a transformer specifies the rated voltages of primary and secondary windings, the rated currents of primary and secondary windings and the rated volt-amp. Meanings of these specifications are as under: While manufacturing a transformer, insulations are provided to primary and secondary windings. These insulations are such that
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