Active Harmonic Filter

The Omniwave Active Harmonic Filter (AHF) provides real-time cancellation of harmonics at the loads. This improves power quality, reduces energy consumption, and prolongs the lifespan of your equipment. The AHF ensures that customer loads are compliant with IEEE 519 and EN 50160.

Harmonic Distortion

Harmonic distortion causes equipment damage, productivity loss, and increased energy costs. Studies show that harmonic distortion damages equipment in your plant, resulting in significant financial losses for businesses.

Key Features & Specifications
  • Modular Design - Ultra-compact design - select from our range of wall-mounted or rack-mounted modules to further enhance flexibility.
  • Scalability – Higher filter capacity can be achieved by paralleling modules - up to 800 Amps for 208V, 480 or 600V 3-phase.
  • Harmonics Compensation - THDv < 5% per IEEE 519 standard. The user-selectable filtering range is from the 2nd to the 50th harmonic order.
  • Load Balance & Reactive Power - The AHF can inject reactive power to correct power factor.
  • Available for various configurations -  3-phase 4-wire or a 3-phase 3-wire topology.
  • Industrial processes
  • Automation and robotic applications
  • Commercial buildings
  • Data centers

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Frequent Ask Questions

What is the difference between a 3-wire or 4-wire AHF?

Omniverter AHF is one of a few active filters in the market that can be configured as a 3-wire or 4-wire configuration.

  • 3-Wire Configuration – Commonly installed at industrial applications like VFD's.
  • 4-Wire Configuration – Commonly installed in commercial buildings to eliminate harmonics (triplen 3, 9 & 15..) generated by switch-mode power supplies and IT equipment.

What is total harmonic distortion?

Total harmonic distortion is expressed as THDv (voltage) or THDi (current).

Total harmonic distortion (THD) is a measurement that indicates the total distortion of voltage or current in a system.

IEEE 519 states voltages up to 1000V, individual harmonic voltages should not exceed 5%. THDv for all harmonic voltages should not be more than 8%

Voltage Distortion

How do you determine where harmonics are generated?

Although most harmonics are generated internally by customer loads it is possible for external harmonics to occur via the utility supply which is connected to other manufacturing facilities. Detailed measurment and analysis is needed to determine the source of distortion.  

Permanently installed power quality analyzers are advisable to measure and monitor the THD levels. If THD exceeds the limits of IEEE 519 then harmonic correction may be required.

Consequences of high harmonic distortion

Harmonic distortion pollutes power quality, damaging equipment over time.

The following are common when the THD is above the recommended levels:

  • Premature failure of VFD's, UPS and power factor correction equipment
  • Overload and overheating of transformers
  • Degradation of motor bearings
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