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  • Users: dk101010
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  1. dk101010

    Harmonic - Transformer Shifting

    I have a question on how the fifth or the seventh harmonics be cancle out after they passed through a delta-Y and delta-delta transformer. I understand that there's a 30 degree phase shifting in the delta-Y transformer. Therefore, there would be 5x30=150 degree phase shifting between the fifth...
  2. dk101010

    IEEE STD Motor X/R table

    Hi all, I have a question in interpreting a X/R ratio for motors on the IEEE Std 141-1993, Figure 4A-3. The figure has two bands, and it is divided in three catagories(High,Medium, and Low Voltage). If I have a low voltage motor, does it mean the X/R ratio of the motor can be range between 1...
  3. dk101010

    3-Phase fault current of closed delta transformer

    We have a padmount closed delta transformer with mid tapped on the largest leg to provide single phase(120/240volts). According to the manufacturer, the largest leg is rated at 150kVA, and the other two are rated at 100kVA. The %Z of this transformer is 3.3, How do I calculate the three phase...

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