why connect alternator in star in generation

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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.
Easy protection: Neutral grounding is necessary to allow zero sequence currents to flow to the ground in case of a fault.
Elimination of harmonics: Star connection facilitates a neutral connection which is instrumental in eliminating triple harmonics.
No circulating currents: In star connection we don't have circulating parasitic currents like in delta which lead to heating losses.

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