Harmonic Filters

The HFE-5P and HFE-8P models are highly efficient, two-stage passive harmonic filters specifically designed to reduce harmonics generated by frequency inverters.

Under realistic operating conditions – such as already distorted mains voltage or uneven mains load – the filters reliably reduce the line current distortion (THDi) to below 5% (HFE-5P) or below 8% (HFE-8P). They thus meet the requirements of relevant standards and guidelines.

In contrast to conventional absorption circuits, which specifically attenuate the 5th harmonic, both models utilize a two-stage filter design. This typically reduces the THDi to around 3% – without concentrating on a single frequency. Instead, the entire harmonic spectrum is effectively attenuated.

Our harmonic filters have the following properties:

  • Reduction of harmonics and low frequency distortion
  • Improvement of the THDi values (<5% possible)
  • Compliance with the harmonic emission requirements of IEC 61000-3-12
  • Less expensive than active harmonic filters
  • Significantly reduced input current (energy saving)

Produktbild HFE-5P

HFE-5P

Harmonic filters for frequency inverters

  • Current ratings from 10 A up to 410 A
  • Optimized for B6 bridge rectifiers
  • Reduction of harmonic content (THDi < 5 %)*
  • Input current will be reduced (saves energy)
  • User-friendly commissioning
  • Cost-efficient compared to active filters
  • * Typical values for 6-pulse inverters with internal DC chokes

Produktbild HFE-8P

HFE-8P

Harmonic filters for frequency inverters

  • Current ratings from 2.2 A up to 1030 A
  • Optimized for B6 bridge rectifiers
  • Reduction of harmonic content (THDi < 8 %)*
  • Input current will be reduced (saves energy)
  • User-friendly commissioning
  • Cost-efficient compared to active filters
  • * Typical values for 6-pulse inverters with internal DC chokes

Normative requirements

… that make the use of a harmonic filter necessary:

IEC/EN 61000-3-2IEC/EN 61000-3-12IEC/EN 61000-3-4
IEC 61000-2-2IEC 61000-2-4