The Impact of Voltage Unbalance

The Impact of Voltage Unbalance

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The voltage unbalance between phases will impact the operation of an electric motor. An electric motor may be de-rated when operating on unbalances under 5%. The effects of voltage unbalance are:

  1. Reduced locked rotor and breakdown torques for the application.
  2. Slight reduction of full load speed
  3. Current will also show significant unbalance that is related to the specific motor design.
  4. Significant operating temperatures may result. For instance, a 3.5% voltage unbalance will result in a 25% increase in temperature rise.

Read more about Eliminating Voltage Imbalance or participate in a Motor Testing & Diagnostics course to learn how to identify and correct the voltage imbalance.

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