1. The problem statement, all variables and given/known data Part A: A 250kVA, 11kV/50Hz supply single phase transformer has 80-turns on the secondary coil, calculate: i. The approximate values of the primary and secondary currents: ii. The approximate number of primary turns iii. The magnitude of the flux in Wb I think I have managed to conquer part A, however it is part B which I am struggling with: A transient disturbance signal affects the current on the primary coil and is in the form of a sinusoidal current signal caused by a magnetic coupling. Discuss the effect of this transient upon the system. 3. The attempt at a solution Assuming the secondary voltage is 240: The approximate values of the primary and secondary currents: 250000/11000=22.7A 250000/240=1041.6A ii. The approximate number of primary turns ((11000).(80))/240=3667 turns iii. The magnitude of the flux in Wb 240 =(4.44).(80).(50).(ϕ_M) φ = 13.5 mWb For Part B: I think that the transient signal will have very little affect on the system because it is being scaled down to a point of 45 times lower than what is on the primary coil. I therefore believe that the disturbance signal will be so weak on the output that it will have a negligible affect on the system. I was wondering if anyone could help clarify if I am on the right lines or I have missed the point all together? Thanks so much in advance.