Power Conditioners - Specifications and Selection

Power Conditioners, like transformers should be sized to match their connected load and service voltage. They should be used upstream from the effected load. While larger power conditioners require installation by an electrician, some of the smaller ones are plug-in devices.

The unit you purchase should be based upon the type and size of load you have. It will also depend upon the type of noise and voltage problem you want to solve. If the noise you have is not mitigated by the unit you purchase, your problem will not go away.

Ferroresonant units produce heat and audible noise, so you may not want to use them in offices. Nor should they be used in line with another ferroresonant unit, since this may cause the smaller of the two units not to regulate the voltage properly. They also are not suited for loads that have high start-up current or three-phase applications. Q These units regulate the voltage in a smoother fashion than tap switching devices, which are smaller, quieter and can be used in single and three-phase applications.

Units should have the following characteristics:

  • Noise reduction of 60 dB or greater,
  • Common mode noise attenuation range of 10 1 kHz to 100 kHz,
  • Efficiency of at least 90% at full load,
  • Manufacturer's warranty of at least one year,
  • Voltage regulation for all load conditions of 4% or less,
  • Response time to voltage changes of 1.5 cycles or less, and
  • Harmonic distortion of less than 3%.