Harmonic Cancellation Connecting Loads Through Phase Shifting Transformers Dave Loucks, Ph.D., PE, CEM.

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Presentation transcript:

Harmonic Cancellation Connecting Loads Through Phase Shifting Transformers Dave Loucks, Ph.D., PE, CEM

Base Case – No Harmonics – 1 Tx

5th and 7th – 1 Tx Nominal 5th 300 (Hz) -16.81 dB and 7th (420 Hz) -17.44 dB below fundamental

5th and 7th – 2 Tx – 30 deg shift 11.6 dB attenuation of the 5th (300 Hz) and 11.3 dB 7th (420 Hz) harmonics

5th and 7th – 2 Tx – 20 deg shift -3.8 dB attenuation of the 5th (300 Hz) and -9.8 dB 7th (420 Hz) harmonics

5th and 7th – 3 Tx – 0, 15, 30 deg shift -12.7 dB attenuation of the 5th (300 Hz) and -15.5 dB 7th (420 Hz) harmonics

5th and 7th – 3 Tx – 0, 20, 40 deg shift -14.7 dB attenuation of the 5th (300 Hz) and -10.7 dB 7th (420 Hz) harmonics

5th and 7th – 4 Tx – 0, 15, 30, -15 deg shift -9.2 dB attenuation of the 5th (300 Hz) and -15.0 dB 7th (420 Hz) harmonics

5th and 7th – 4 Tx – 0, 20, 40, 40 deg shift -14.7 dB attenuation of the 5th (300 Hz) and -10.7 dB 7th (420 Hz) harmonics

Summary Configuration 5th 7th 2 TX 30 deg -11.6 dB -11.3 dB 1 75, 75, 112.5, 30 kVA

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