Active Harmonic Filters

  • A harmonic filter is used to eliminate the harmonic distortion caused by appliances. Harmonics are currents and Voltages that are continuous multiples of the fundamental frequency of 50Hz such as 100 Hz ( 2nd harmonic) and 250 Hz ( 5th harmonic)
  • An increasing number of loads are non- linear, introducing harmonics into the power gird and thus significantly impairing the power quality. An active harmonic filter that effectively reduces the unwanted harmonics.
  • Active power factor correction also markedly diminishes total harmonics, automatically corrects for AC input voltage, and is capable of a full range of input voltage. Since active PFC is the more complex method of Power Factor Correction, it is more expensive to produce an Active PFC power supply than PFC. Moreover, PFC has improved the power factor, But PFC is itself generating harmonic.
  • Harmonics are caused by non- linear loads, that is loads that draw a non – sinusoidal current from a sinusoidal voltage source. Some examples of harmonic producing loads are electric arc furnaces, static VAR compensators, inverters, DC converters, switch-mode power supplies, and AC or DC motor drives.
Electrical Specification
  • Connection Method: 3 phase, 4 wire, 50 /60 Hz ±5%
  • Utility Voltage 1: 400 VAC + 10%, -15%
  • Filter Current 1: 75 A to 600 A
  • Utility Voltage 2: 480 VAC + 10%, -15%
  • Filter Current 2: 60 A to 500 A
  • Utility Voltage 3: 575 VAC + 10%, -15%
  • Filter Current 2: 50 A to 400 A
  • Filter Current Neutral: 3 x Line Current
  • Parallel Combination: Maximum 4 units of same power rating in master follower
  • Filter Power Loss: Up to 3% of Equipment Rating
  • Protection For Filters: MCCB and Fast Acting Semiconductor Fuses
  • Cooling: Forced Air Cooling
  • Cable Entry: Front – Bottom
Filter Specifications
  • Harmonic Range: 2nd to 50th
  • Attenuation Ratio: Upto 96% at rated current
  • Selection: Any 20 harmonic can be selected at a time.
  • Response Time: < 40ms
  • Reactive current compensation: Yes
  • Priority Selection: Yes ( PF and Harmonics )
  • Load Balancing: Yes