Hello, I have 2 questions, in the following circuit (is a balanced circuit) I know the value of the impedances, and the voltage of the source, on the left side I can transform the delta type impedance to a star type impedance, and then perform an impedance operation on parallel? (Z // Z) and my other question is, can I consider the line voltage as the phase voltage of the delta type source? Thank you very much and sorry for the bad English.