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Active harmonic filters are parallel filters (which means the current doesn’t go through the filter) that are used to reduce, or mitigate, harmonics to tolerable levels as defined by IEEE-519. Active filters use a set of transistors and capacitors to filter (or clean) the current wave by injecting inverse currents to cancel out the undesired harmonic components. Active filters are significantly more expensive than passive filters and take up more space. Size is an immense factor in system design today and should be accounted for when deciding on what type of harmonic filter is right for you. Active filters can work with multiple drives; when the active filter reaches its limit, it won’t overload. In addition, if an active filter breaks, it won’t stop the motor (since current isn’t going through the filter); it just won’t filter the current wave.


  • Multifunctional: Harmonic, reactive power and imbalance compensation
  • High harmonic filtering rate: Up to 98%
  • Excellent reactive compensation: High speed, Precise (-0.99≤PF≤0.99), Step-less, Bi-directional (capacitive and inductance) compensation
  • Excellent imbalance correction: Both negative and zero sequence, mitigates neutral current Wide input voltage & frequency range, adapts to tough electrical environments Low thermal loss (≤3% of rated APF kVA), efficiency ≥ 97%
  • High stability: Infinite impedance to grid, avoids harmonic resonance problems
  • Flexible application: Modular design, embedded in standard or customized cabinet
  • Easy installation and maintenance: Plug-in installation for APF module replacement and expansion
  • Wide capacity range: 50A~525A for a single cabinet, up 10 cabinets in parallel
  • Environmental adaptability: -10~50°C temperature, compatible with diesel generator
  • Complete protection: Grid Over/Under voltage, APF over current, over temperature, and more. All faults are recorded in the event log, which is convenient for failure analysis


  • They offer energy efficiency that can minimize operating costs and keep equipment in working condition for a lot longer.
  • They minimize disruptions during the production process.
  • They decrease the emission of carbon dioxide as well.

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