Westek Electronics MTE RLW series DIN-rail mounting line reactors

The MTE RLW series DIN-rail mounting line reactors provide other functions in addition to harmonics mitigation on the line side of variable speed drives.

The properly selected reactor in the input circuit virtually eliminates tripping of drives due to voltage spikes originating from switching sequences including power company VAR compensators.

The reactors can also protect against short duration line sags and can also be used on the motor side of variable speed drives provided that an 80% loading factor is applied.

Use on the output side of a variable speed drive leads to lower motor temperature, compensation for long motor cable capacitance, dv/dt reduction, peak voltage reduction, smoother running, less audible noise, less interference to adjacent systems, surge current protection for VSD output as well as improving motor performance and system efficiency.

The reactors are rated in percent impedance to retain some conformity with the ratings of conventional drive isolation transformers. There is a range of impedances and current ranges and, in combination with line impedance, the devices can reduce harmonics to under 30% THID from values greater than 100%.

The range covers 415 V, three-phase and 690 V, three-phase. The former voltage rating covers motor ratings to 375 kW (full load current to 727 A), and the latter, motor ratings to 750 kW (full load current of 540 A). Impedance levels can be selected in 3, 4 and 5% values.