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Terms and conditions

Three-phase alternators are invariably star connected because

  • Three-phase alternators are invariably star connected because a higher terminal voltage is obtained.
  • In a star-connected three-phase alternator, the voltage between any one phase and the neutral point (which is usually grounded) is equal to the phase voltage.
  • Therefore, the terminal voltage of the alternator, which is the voltage between any two phases, is equal to the phase voltage multiplied by the square root of three (√3).
  • In contrast, if the alternator were delta-connected, the terminal voltage would be equal to the phase voltage, and the phase voltage would be lower than the phase voltage in a star-connected alternator.
  • Therefore, star connection is preferred in applications where a higher terminal voltage is desired.