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  1. hazer2004

    % Total Harmonic Distortion

    One of the buildings I am monitoring has a THD of 33.2%. This builidng is served from a 2000 KVA transformer at 48 Volts and the amp reading at the time was 697. There are presently 2 ABB VSD for 2 150 HP AHU Supply fans and the dirves run continuously at 44 HZ. We shut the 2 fans down and...

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