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

2. Base Case – No Harmonics – 1 Tx

3. 5th and 7th – 1 Tx
Nominal 5th 300 (Hz) dB and 7th (420 Hz) dB below fundamental

4. 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

5. 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

6. 5th and 7th – 3 Tx – 0, 15, 30 deg shift
-12.7 dB attenuation of the 5th (300 Hz) and dB 7th (420 Hz) harmonics

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

8. 5th and 7th – 4 Tx – 0, 15, 30, -15 deg shift
-9.2 dB attenuation of the 5th (300 Hz) and dB 7th (420 Hz) harmonics

9. 5th and 7th – 4 Tx – 0, 20, 40, 40 deg shift
-14.7 dB attenuation of the 5th (300 Hz) and dB 7th (420 Hz) harmonics

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