What will happen when I change the excitation in synchronous motor or generator?

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What will happen when I change the excitation in synchronous motor or generator?

Synchronous Motor or Generator can run in both form.

  1. Over excitation or
  2. Under excitation.

When run as alternator alone:

Over and Under excitation will increase or decrease the terminal voltage.

When run as alternator connected with the grid or infinite BUS

  1. Over excitation will deliver additional inductive VAR to the grid and and will operate at lagging power factor
  2. Under excitation will absorb reactive power from the grid and will operate at leading power factor.

When run as Synchronous Motor and connected with the system:

  1. Over excitation will deliver additional leading VAR to the system and and will operate at leading power factor
  2. Under excitation will operate at lagging power factor and will increase inductive VAR of the system.

Source: quora.com

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