Tuned harmonic filters have a reactor coil connected in series with the load and also a shunt leg with L and C components. The shunt leg is tuned to a particular frequency by selection of specific L and C component values. For compensating multiple harmonic orders, parallel shunt legs are connected where each leg is tuned to a different frequency. As can be understood from the topology, this design is extremely rigid and inflexible. If the load profile changes in the future, or the load increases then the components of the filter also need to be replaced with higher capacity components. Moreover, the use of a series reactor leads to significantly increased losses resulting in increased bills.

Typical Loads

  • Variable Frequency Drives
  • DC Drives
  • UPS Systems
  • Electronic Ballasts
  • Arc Furnaces
  • Battery Chargers
  • CNC Machines