Quantcast Transformer Losses and Efficiency - h1011v4_56

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TRANSFORMER THEORY Transformers Core losses are caused by two factors:  hysteresis and eddy current losses.  Hysteresis loss is that energy lost by reversing the magnetic field in the core as the magnetizing AC rises and falls and reverses direction.   Eddy current loss is a result of induced currents circulating in the core. The efficiency of a transformer can be calculated using Equations (13-8), (13-9), and (13-10). (13-8) Efficiency Power  Output Power  Input PS PP x  100 (13-9) Efficiency Power  Output Power  Output Copper  Loss Core  Loss x  100 (13-10) Efficiency VS  IS  x  PF (VS  IS  x  PF) Copper  Loss Core  Loss x  100 where PF  =    power factor of the load Example 1: A  5:1  step-down  transformer  has  a  full-load  secondary  current  of  20  amps.   A short circuit test for copper loss at full load gives a wattmeter reading of 100 W. If RP = 0.3W, find RS and power loss in the secondary. Solution: Copper  Loss I2P  RP I2S  RS 100  W To find IP: NP NS IS IP IP NS NP IS 1 5 20 4  amps To find RS: I2S  RS 100 I2P  RP RS 100 I2P  RP I2S 100 0.3(4)2 202 0.24 ES-13 Page 12 Rev. 0


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