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Harmonic Mitigation



Yes, an independent third party test was conducted to evaluate the use of harmonic filters on bypass systems. The concern is to ensure the series inductor does not provide too excessive of a line voltage drop to prevent proper operation of the bypass control contactors. A 75 HP NEMA design A motor and drive package with a bypass option was tested. Extensive testing showed that the voltage drop across the 480/120 volt control power transformer being caused by the series reactor was approximately 10% at full load which was well within the contactor coils dropout rating. The bypass circuit worked very well and the results concluded that a harmonic filter can be used with a standard drive/bypass configuration without any special system modifications.

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