Introduction: This application note explains how to use a 3-phase line reactor for single-phase applications. It provides a method to calculate the necessary inductance and select the appropriate reactor.

Using 3-Phase Reactors for Single-Phase Applications: MTE's three-phase line/load reactors can be adapted for single-phase use by routing each of the two supply conductors through an outside coil, leaving the center coil disconnected. The total inductance is the sum of the inductance of the two coils.

Example Calculation: For a single-phase application of 2HP at 240 Vac, the reactor must carry 12A with a desired 5% impedance. Using the formula L = (ZV) / (377I), the required inductance is calculated to be 2.65 mH. MTE part number RL-01201, with an inductance per coil of 1.25mH, is suitable, providing a total inductance of 2.5mH and an effective impedance of 4.7%.

Selection Table: The document includes a selection table for single-phase motor drive applications, listing part numbers for various horsepower and voltage combinations, ensuring a typical percent impedance rating of 5%.