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Have the impedances changed for 690V KDR/KLR reactors? What will my impedance be at 690 volts?

The units will have the same design as the 600 volt reactors, thus impedance is proportionately lower. Impedance is down to 4.3% (from 5%) or 2.6% (from 3%). 600/690 = 86.9% multiplied by 5% results in 4.3% (or multiplied by 3% results in 2.6%). Current ratings are standard 600 volt ratings.