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PASSIVE HARMONICS FILTER

It is widely believed that active harmonics filters (AHF) are very costly and, therefore, are the last choice for power quality solutions. The answer is it depends. Every harmonics mitigation and power factor correction device has its place in the market.

Harmonics Are a Problem

Harmonic distortion has become an increasing concern for facility managers, users of automation equipment and specifying engineers alike. Harmonics not only waste energy, but they reduce equipment life, electrical system reliability, system efficiency and equipment productivity.

Typical Applications Include:

  • Mission critical facilities
  • AC variable frequency drives
  • DC adjustable speed drives
  • Electronic welders
  • Battery chargers
  • Fans and Pumps
  • Water Treatment Facilities
  • Induction heating equipment
  • Elevator drives
  • 3-phase power supplies
  • Any 6-pulse rectifier

Detail:

Active harmonics filters provide controlled current injection to remove harmonic current from the source side of electrical system s and reactive current to correct for poor displacement power factor (PF). Active harmonics filters can be applied to a single nonlinear load or many. The nonlinear loads can be mixed types or devices, such as variable frequency drives (VFD), DC motor speed controls (aka DC drives), uninterruptible power supplies (UPS), or thyristor (DC) power supplies, to name a few.

When is the best value achieved with active harmonic filters?

  • When more than one nonlinear load and/or type of loads are present : DC drives, UPS, VFD, and others can operate on the same electrical system as an active harmonics filter system
  • When input line reactors are used to reduce the total harmonics distortion of nonlinear loads.
  • When 6-pulse rectifiers are employed in DC drives, UPS, VFD or DC power supplies.
  • When thyristor rectifiers are used and power factor and harmonics correction are required : DC drives and DC power supplies require power factor correction and harmonic mitigation.
  • When PF correction is required where high harmonics content is present : Poor power factor in an electrical system a high content of nonlinear loads cannot be performed by traditional power factor correction capacitor systems
  • Where rapid in-rush or step load changes require support (aka VAR compensation) to stop flicker : The power quality of an electrical system is quite poor due to the massive voltage variations caused by the loads.
  • When meeting harmonics specifications within your facility.