Exam Question

(a) Explain how drooping characteristics cater for stable operation when running in parallel. (6)

(b) Two shunt generators X and Y work in parallel. Their external characteristics may be assumed to be linear over their normal working range, the terminal voltage of X falls 265V on no-load 230V when delivering 350A to the busbars, while the voltage of Y falls from 270V on no-load to 240V when delivering 400A to the busbar. Calculate the current with each machine delivers when they share a common load of 500A. What is the busbar voltage under this condition and the power delivered by each machine (10)