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Answer Posted / amit vishwakarma
Star delta starter used for squirrel cage motor,utilises the principle of reducing the starting voltage.all the six terminals( each of two) of 3 phase induction motor are brought to the starter ......
In fact start delta starter is simply a two way switch. The method is based upon the principle that with 3- winding connect in star, the voltage across each winding is 1/√3..i.e.57.7% of the line to line voltage whereas, the same winding connected in delta will have full line to line voltage across each.
The star delta starter connects three stator winding in star across the rate supply voltage at the starting instant. After the motor attain speed, the same winding through a change over switch are connected in delta across the same supply voltage..
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