I have seen that for a delta-wye connected transformer the 30deg shift between the primary and secondary causes the line current on the delta primary to only be 58% during a single L-G fault on the wye secondary. Although I understand this concept I was hoping to get some help with the vector math in the primary delta winding and line currents to help explain this relationship.
So if 1per unit current is flowing through the secondary wye winding for a L-G fault, this means that 1 per unit current will also be flowing through the delta winding. Its getting from this delta winding current to the two line currents at 58% that I am having trouble with. Can someone give me the equations or vector math to help me see this more clearly?
So if 1per unit current is flowing through the secondary wye winding for a L-G fault, this means that 1 per unit current will also be flowing through the delta winding. Its getting from this delta winding current to the two line currents at 58% that I am having trouble with. Can someone give me the equations or vector math to help me see this more clearly?