A harmonic study is performed to determine if harmonic voltages and currents are at acceptable levels. A harmonic study:

• avoids damage due to excessive harmonic currents in transformers and capacitor banks.
  
  
• ensures sensitive electronic equipment will not malfunction due to excessive harmonic voltage distortion.
   
• satisfies the utility's voltage and current harmonic distortion requirements.

Harmonic studies should be considered whenever there are solid state drivers or electric furnaces and capacitor banks in the power system.