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AFP Transformers Corp - Harmonic Filter Inductors (Low and Medium Voltage)
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AFP's broad product line of harmonic filter inductors ranges from small single or three phase, low voltage units to large single-phase devices typically used in medium voltage applications. Although the low voltage devices have "typical" standard sizes, medium voltage units are usually designed to a specific application and hence are very customized products. Harmonic Filter Inductors are also referred to as Harmonic Filter Reactors or Tuning Reactors.
Harmonic Filter Inductors are always used in conjunction with Power Factor Correcting capacitors (PFCs). The Harmonic Filter Inductor (L) and the PFC will form an LC filter system that will either "tune" or "detune" to a desired frequency. If the LC filter is a "tuned filter", harmonics at the tuned frequency will be attenuated. If the LC filter is a "detuned filter", the power factor correcting system will not reach a parallel resonance point with the incoming power system's impedance; therefore extending life to the PFCs.
Harmonic Filter Inductors differ from other types of magnetic devices (inductors, reactors or chokes) in their design and construction characteristics. The Harmonic Filter Inductor has amongst its design characteristics a large consideration for harmonic currents. It is not uncommon to have harmonic current ratings greater than the fundamental 60 Hz current rating. This high harmonic content will create additional heating in the magnetic device. AFP's Harmonic Filter Inductors are compensated in the winding, gap and core losses for their specified harmonic contents.
Features for AFP's Harmonic Filter Inductors are:
- Copper windings
- Balanced core and coil heating
- Less than 20% of watts loss as a result of fringing (also referred to as "Gap Losses");
- Inductances tuned to specifically match capacitor KVAR ratings
- 200 C insulation system rating as a minimum. Most designs utilize 220 C insulation system
- 115 C maximum temperature rise. 80 C and 100 C rises also available
- 20 year operating life expectancies when used at the rated current values
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