Q1) The equivalent low-side parameters of a 250kVA, 4160 – 480V, 60 Hz transformer are Reg.LS 0.00920 2 and Xeq.LS = 0.0433 Q. The transformer is operated in the step-down mode and is delivering rated current at rated voltage to a 0.840 power-factor lagging load. Determine: the no-load voltage, the actual input voltage on the high-side, the high- side current, the input impedance, and the voltage regulation. =

b) A lkQ resistance is connected across the secondary winding of a 200V/400V transformer with the following equivalent circuit parameters, Kleq=502, Rc = 10k2, XM =1 k2 , ^leq = 100 2. Determine the following: R i. The Open Circuit Output Voltage (Vsoc) ii. The Output Voltage under load (Vs) i1i. The Output Current (Is) iv. The Transformer Efficiency (%)

Construct the circuit in Figure 1 in the Circuit JS simulator. Note that the voltage source is given in RMS. Within Circuit JS while defining the max voltage of the voltage source include “rms” after the number to tell Circuit JS that this is a rms value. Also note that there are additional parameters when instantiating a transformer in Circuit JS. Leave these at the default values. Additionally, transformers may have problems simulating in Circuit JS.  Answer the following: 1. From the simulation results, determine the power dissipated in R2 and compare to the expected value from the previous section.2. Change the transformer ratio (“Ratio” as a fraction when you “Edit…” the transformer component) to the value calculated in the previous section to provide maximum power transfer in R2. Note: In Circuit JS, Transformer Ratio = Primary/Secondary.3. Rerun the simulation, calculate the power dissipated in R2 and compare to the expected value from the previous section.4. Change the…

4.) A transformer has a primary coil with 300 windings, and secondary coil has 400 windings. The input AC power supply is 120 volts (Vrms). A) Is this a step-up or step-down transformer? B) What is the rms voltage across the output terminals (Vrms)? C) What is the peak voltage across the output terminals (Vmax)? Primary Secondary imm ac input

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…

Vr 3. For a 1.2 accuracy class potential transformer used at a lagging phase angle y of 10', the RCF value is A. 0.991. B. 0.988. C. 0.977. D. 0.999. primary connection scheme that must be used with

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figure the S-parameters for an ideal transformer with turn ratio N = N1:N2 where N1 is the no.of turns of the primary winding and N2 is the no. of turns of the secondary winding.