Formulae

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S

Start Current

Autotransformer $I subscript m o t o r space s t a r t end subscript equals fraction numerator percent sign T A P over denominator 100 end fraction cross times I subscript d o l end subscript$

Autotransformer $I subscript L i n e space s t a r t end subscript equals open parentheses fraction numerator percent sign T A P over denominator 100 end fraction close parentheses squared cross times I subscript d o l end subscript$

Star Delta $I subscript s t a r end subscript equals 1 third cross times I subscript d e l t a end subscript$

Starting Torque

Autotransformer $T subscript s t a r t end subscript equals open parentheses V subscript s t end subscript over V subscript d o l end subscript close parentheses squared cross times T subscript d o l end subscript$

Star Delta $T subscript s t end subscript equals 1 third cross times T subscript d o l end subscript$

Synchronous Speed

$N subscript s y n c end subscript equals fraction numerator 120 f over denominator P end fraction$