• GR Electronics

Harmonic Tuned filters

GR has been a pioneer and innovator offers Harmonic Tuned filters. When non-linear loads make up more than 30% and less than 80% of the electrical load on a distribution system, some type of harmonic filtering is required to maintain harmonic distortion within the limits. The least complicated filter is a series tuned L-C shunt filter, often called “harmonic tuned filter”.

uch filters are constructed from specially designed reactor (L) and three phase power capacitor(C). One of the characteristic of a series L-C filter is that its impedance is extremely low at the tuning, or resonant, frequency. If we select the tuning frequency to be major harmonic drawn by a non-linear load, the load will only its fundamental frequency current from the distribution system. Most of the selected harmonic current will be drawn from trap filter. Since much of harmonic current demanded by non-linear load now comes from the trap filter and less harmonic current is drawn through distribution system.