![]() We know that in star connection winding voltage is equal to 1/√3 of line voltage but winding current is equal to line current. In this starter motor is running in star winding during start, when motor get full rpm, winding convert in to delta winding. Star delta starter used to reduced starting voltage.This also reduces the torque. Two methods are used for reduction of starting voltage are star delta starting and auto transformer starting To limit the starting current flow, large induction motors are started at reduced voltage and when motor achieve own rotation speed, full supply voltage reconnected. Due to large current, they cause disturbance in supply voltage. Most induction motors are started using direct online starter, but when very large power motors are started using DOL, they take large starting current. It’scost effective and simple operationas compare other voltage reduced starter. Star delta starter is most commonly used starter after direct online starter in electrical world.
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January 2023
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