This problem is related to P15.68 in "Electrical Engineering : Principles and Applications" (Hambley)Ed6. his problem is related to P14.69 in "Electrical Engineering : Principles and Applications" (Hambley)Ed7. ind the equivalent resistance R, and capacitance C! seen looking into the transformers in figure below. (Hint : Keep in mind that it is the impedance that is reflected by the square of the turns ratio N: 1 R'. - N:1 CL L= 250, CL = 1µF,N = 4. pur answers are validated to +/ - 0.01 absolute. N help (numbers) µF help (numbers) lle

A 500 MVA synchronous machine has H, = 5.6 MJ/MVA and a 1200 MVA machine has H₂ = 2.0 MJ/MVA. The two machines operate in parallel in a power station. What is the equivalent. H constant for the two, relative to a 100 MVA base?

4. Would you parallel a delta-delta (A - A) 3-phase transformer bank with a delta-wye (A - Y) bank, assuming their output and input terminal voltages are equal? Justify your answer by superimposing their separate vector diagrams. (Hint solve the short circuit current at the secondary for %Z = 5%) Ans. Isc=518% of secondary current

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A 1,000/200 V transformer takes 0.3 at p.f. of 0.2 on open circuit. Find the magnetising, and iron loss component of no- load primary current.

1. A 10 kVA, single-phase, 2400-V:120-V, 60 Hz transformer has an equivalent impedance referred to LV side of 0.01 + j0.09 Q. This transformer has a core loss of 100 W at rated voltage. When rated current is applied to the 2400-V winding, the exciting current in that winding is found to be 0.2 A. a. Find the full-load regulation of this transformer at a power factor of 0.8 lagging. b. Find the efficiency of this transformer at full load, 0.8 power factor lagging. c. If standard open-circuit and tests were performed on this transformer, what would be the measured values of these tests? 2. The following data were obtained on a 2.5 MVA, 50-Hz, 19.1-kV:3.81-kV single-phase transformer tested at 50 Hz: Voltage (V) Current (A) Power (kW) LV winding with HV terminals open-circuited: 3810 9.86 8.14 HV winding with LV terminals short-circuited: 920 141 10.3 a. Calculate the cantilever equivalent-circuit parameters as referred to the transformer high-voltage winding. b. Calculate the cantilever…

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