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Induction motors are widely used in most of the Industries. Induction motors draw very high current in the order of 5 to 8 times the rated current during starting. Starting of a higher rating Induction motor using Autotransformer has been found great importance in limiting the starting current and improving the starting torque compared to star-delta starter. This paper discusses the design and analysis of an energy efficient Autotransformer starter of rating 6.6 kV, 110 kVA to start an induction motor of rating 6.6 kV, 250 KW. The Autotransformer was designed with on-load tap changing facility of eight tapping’s ranging from 50 % to 85% with each step tapping of 5%. Laser Scribed 23ZDMH85 material and conductor of current density 3.07A/mm are proposed in the present work to reduce the total losses. The feasibility of achieving a reduction of about 22% in total losses compared to conventional transformer is discussed in detail. At 50% tapping, unity power factor the estimated efficiency of the autotransformer is 99.21%.

DESIGN OF AN ENERGY EFFICIENT AUTOTRANSFORMER FOR STARTING AN INDUCTION MOTOR