How can we determine the phase voltage of a balanced triangle three-phase source when impedances are present in that source and knowing the line voltage?
When we only have voltage sources, the line voltage gives us the value immediately:
line voltage = (triangle) phase voltage
When we include impedances within the source, this relationship isn't true anymore. How do we find the values of the (triangle) sources (e1,e2 and e3) in that case?
Here's an image of a circuit to better visualize the problem (consider R1 = R2 = R3).