Alternators are connected primarily in star to achieve the following motives: Lesser stress on insulation and Copper saving: Voltage per phase is less for a given line voltage which reduces insulation requirement and this also reduces the number of turns hence copper is also saved.

Why is the generator connected to the generating station in star and not Delta?

Therefore for generating the same line voltage, the requirement of number of turns in STAR connection of armature winding will be less as compared to DELTA connection. 4) STAR connection eliminates the triplen harmonics in the generated terminal voltage of generator armature winding.

What is the advantage of star connection?

Advantages of star connections:

Each phase is a separate circuit. Dual voltage applications. Star connection can distribute the load evenly. Star connection alternator requires lesser insulation.