The Star-Delta starting of a squirrel cage induction motor, compared with DOL, needs to be expanded, starting current and torque are reduced by a factors of
1
\(\frac{1}{{\sqrt 3 }},\frac{1}{3}\)
2
\(\frac{1}{3},\frac{1}{3}\)
3
\(\frac{1}{{\sqrt 3 }},\frac{1}{{\sqrt 3 }}\)
4
\(\frac{1}{3},\frac{1}{{\sqrt 3 }}\)