Ok, we are making a modification at the plant that involves 2 480v boards that are interlocked. Normally the tie breaker is open. Each board is fed by a separated 6.9kV/480V XFMR. The cable runs for each are not the same length.
The qauesiton was raised, what would happen if we parallel these transformers onto the bus. I know there will be a higher than expected SC current possible, which also raises arc flash concerns, and there will likely be circulating currents due to slight mismathces in phase and impedance, but the qauestion was about the impact on the attached motors.
Will the motors suffer from this configuration? As I see it, each phase will have a slight "ripple" from the slight phase mismatch of the 2 seaparate power feeds. This will be something like harmonics, but I don't know really how to evaluate this condition or how to quantify it.
Do you folks have any ideas?
The qauesiton was raised, what would happen if we parallel these transformers onto the bus. I know there will be a higher than expected SC current possible, which also raises arc flash concerns, and there will likely be circulating currents due to slight mismathces in phase and impedance, but the qauestion was about the impact on the attached motors.
Will the motors suffer from this configuration? As I see it, each phase will have a slight "ripple" from the slight phase mismatch of the 2 seaparate power feeds. This will be something like harmonics, but I don't know really how to evaluate this condition or how to quantify it.
Do you folks have any ideas?