Recently asked questions in Kochi mmd and Class 2 Numerical solutions

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29 September 2018

What is the starting current of different starters

September 29, 2018 Posted by AK 2 comments
dol (starting current can be as high as eight times the full load current of the motor)
star delta (A three phase motor will give three times the power output when the stator windings are connected in delta than if connected in star, but will take 1/3 of the current from the supply when connected in star than when connected in delta. The starting torque developed in star is ½ that when starting in delta.)
auto transformer (Reduced voltage reduces current in motor windings with 50% tapping used motor current is halved and supply current will be half of the motor current. Thus starting current taken from supply will only be 25% of the taken by DOL starter)

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