Wire Consultancy Engineering and Safety

Active Harmonic Filter

Active Harmonic Filter is a solid-state power converter that brings about the advantages of harmonic currents elimination, improving power quality. These active shunt systems Sense Load Current, Evaluate the high frequency.

Investments in harmonic filters generally pay off within 6-24 months. This means that kWh losses are reduced, reactive power costs are decreased, the lifespan of electrical instruments is lengthened and production processes are stabilised.


  • Reduce harmonics level (Below IEEE limits 5%)
  • Improve Power Factor (Above 0.99)
  • Balance load current

Products Range:

A pioneer in the past, a leader today in the industry most comprehensive capacity series of APF

  • 400V AHF Products series: 25A 35A 50A 60A 100A 200A~600A
  • 480V AHF Products series: 75A 150A 225A 300A
  • 690V AHF Products series: 75A 150A 225A 300A



Active Harmonic Filter Data Sheet
System parameters
1 Voltage of rated AC input line 400V
2 Input frequency 45Hz ~ 63Hz
3 Permitted parallel units No limit
4 efficiency ≥98/%
5 Network configuration Three phases and three lines, three phases and four lines
6 CT setting 150/5 ~ 10,000/5
AHF mechanical characteristics
1 Mechanical dimension W×D×H 440×470×150 mm
2 Weight 18 Kg
3 Gross Weight 20 Kg
4 Protection level IP20
AHF AC input (mains supply)
1 Rated voltage of input line 380/400/415
2 Scope of input phase voltage 132V~264V
3 Frequency 50/60Hz (scope: 45Hz~63Hz)
4 Forced cooling 151 L/sec
5 Normal mode (full load) loss <0.52/0.73
6 Overall efficiency >97
Environmental characteristics
1 Noise (within 1 meter) 52DB
2 Altitude For <1,500m, or >1,500m, refer to GB/T3859.2derating
3 Relative Humidity 5%~95%, no condensation
4 Operating temperature -10~40 Deg
5 AHF storage temperature 20-70 Deg
European and International standards
1 General safety requirements for AHF use and operation area EN 50178:1997/IEC 50178:1997
2 AHF EMC requirements EN 61000_6_2(2005)/ EN55011,GROUP1,CALSSA
3 AHF performance requirements EN 50091-3/IEC 62040-3/AS 62040-3(VFI SS 111)


  • Significantly reduced Voltage Waveform Distortion
  • Reduced Voltage Drops on Transformers and Cables
  • Reduced Temperature rise on Transformers and Cables
  • No risk of harmonic Resonance / Improved Power Factor