If have given 3 single phase transformers. Each has an impedance of Z= 2% or 0.02 per unit. If you make a connection of Delta-Delta transformer bank, then what would be your overall impedance (Z%) in Delta?
Asuume that 12kV/480v, 176kVA for single phase. You can make any assumptions you need to calculate your Z.
My calculation: I considered 2% as a single Z value in Y form of connection and then I converted to Delta from the Y.
So, Z(total): (2.2+2.2+2.2)/2 = 6 (using the basic formula for Y to Delta conversion).
Thanks for any reply.
Asuume that 12kV/480v, 176kVA for single phase. You can make any assumptions you need to calculate your Z.
My calculation: I considered 2% as a single Z value in Y form of connection and then I converted to Delta from the Y.
So, Z(total): (2.2+2.2+2.2)/2 = 6 (using the basic formula for Y to Delta conversion).
Thanks for any reply.