1. The problem statement, all variables and given/known data A three-phase line delivers 3600 kW at its receiving end at a lagging power factor of 0.85. The line resistance and reactance are 5 Ohms and 8 Ohms per phase respectively. Given that the sending end line voltage is 33kV, you are asked to determine the receiving end line voltage. 2. Relevant equations Z = R + jX z = 90 - arctan(X/R) p.f. = P/√(P²+Q²) P2 = Active power at the receiving end = 3600 kW Q2 = Reactive power at the receiving end = 2231.08 kVAR (found using the equation above) P2 = E1*E2*sin(z+d)/Z - (E2/Z)^2*R Q2 = E1*E2*cos(z+d)/Z - (E2/Z)^2*X 3. The attempt at a solution I'm trying to solve this system of equations which has two unknows (d & E2) but I don't think that's the right approach... Any ideas?