The benefits of the right line reactor - for drives and motors. A line reactor can enhance performance, life expectancy and efficiency for motors and drives. Line reactors serve as a current limiting device for harmonic and transient waveforms, and can make a tremendous impact. Nuisance tripping, heat, noise, and premature failure are a few problems that can typically be resolved with the added impedance provided by a line reactor. Without a reactor - high peaks, shorter wave Source Rockwell Automation - Mequon Wisconsin With a reactor - lower peaks, longer wave The added impedance of the line reactor lowers the current peak while extending the wave further over time. Line reactors are usually rated by the percent impedance (Z) they will add to the circuit (1.5%, 3%, 5%). A good rule of thumb for most industrial applications is 3%. The percent impedance can provide an indication as to how much voltage drop occurs across the reactor, and is %Z = [(Voltage Drop x 100)/Applied Voltage] x V3. Reactors can be applied to the line and load side of a VFD, each with numerous benefits. A few of those benefits include: Line circuit - >*—^ Reducing Extending minimizing harmonic distortion VFD faults Motor Life Reduce tripping in switchgear (solid state Reduce tripping from line sags and peaks Lower temperatures (up to 20° C). sensing devices). Reduces Current surges from Voltage Reduced noise from PWM, by 3-6db, Reduce harmonic peaks generated by drive. Transients Reducing impact of reflected wave. Selecting a Line Reactor for VFD applications There are several line reactors on the market from very reputable suppliers. When looking for you next line reactor, be sure to consider:

Insulation class – look for 200⁰ C insulation or better. Ask for VPI (vacuum pressure impregnation) construction. Expect a minimum of a 115⁰ C heat rise. Reactors should be designed for both line and load side use, with no de-rating. A Good Choice – VTdrive FWI-Series Line Reactors VTdrive makes a fantastic line reactor. It not only meets the requirements suggested below, but also: a) Maintains 95% of its inductance at 150% load. b) Can be operated at 50⁰ C (122⁰ F) for up to 24 hours. c) Is short circuit tested (tested at 25 times rated current for 2 seconds)! Shenzhen VTdrive Technology Co.,Ltd....