A 1200 kVA, 2.3 kV, 3-phase, star - connected alternator has a resistance of 0.401 /phase and a synchronous reactance of 3.21 /phase. If the generator is supplying a load at a power factor of 0.8 lagging and at rated KVA, calculate the change in line voltage at the output terminals of the generator if the load is suddenly disconnected. Assume the speed and the excitation current is to remain unchanged.