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Starting Method Of Squirrel Cage Induction Motors 

 

 

 The induction motor rotor has a short circuited secondary of the transformer. So if the stationary motor is supplied with normal voltage the a very large initial current is taken by the primary for short period of time similar to transformer. This is due to the no back emf during start to oppose the initial rush in of the current .so when the induction motors connected in direct on line draws 5 to 7 times the original full load current this leads to heavy undesirable voltage dip which affects the electrical machineries, at this stage they develop only 1.5 to 2.5 times the full load torque. Therefore the induction motor have 25 kw to 40 kw should not be started on direct on line. The various ways to start the squirrel cage induction motor are:

          Primary resistors

          Auto transformer

          Star delta switches

          Direct o line starting method

 

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