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lewisbedwell
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Homework Statement
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.
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.