kingpb
Senior Member
- Location
- SE USA as far as you can go
- Occupation
- Engineer, Registered
Application is bi-directional power flow. Typically, the design has been delta (LV side) and Y-grounded (HV side). But because of this setup it leaves the MV bus ungrounded. I have proposed using a zigzag to ground MV bus, but started to think that why can't the step-up/step-down transformer be Y grounded (LV side) and delta (HV side)??
I know the client is concerned with some harmonics transfer (PCC is HV side), but it would really make sense to me to more effectively have the MV bus grounded.
If a zigzag is used, wouldn't it be best to put it right at the LV terminals of the main transformer (space is not an issue)
Just seems there should be a better/easier/cheaper way to do this. Having to use bus differential protection because of the ungrounded bus, just doesn't seem like the best choice.
Sorta talking out loud, but would appreciate others ideas.
I know the client is concerned with some harmonics transfer (PCC is HV side), but it would really make sense to me to more effectively have the MV bus grounded.
If a zigzag is used, wouldn't it be best to put it right at the LV terminals of the main transformer (space is not an issue)
Just seems there should be a better/easier/cheaper way to do this. Having to use bus differential protection because of the ungrounded bus, just doesn't seem like the best choice.
Sorta talking out loud, but would appreciate others ideas.