







Machine 1 (7) The equivalent circuit parameters of a single-phase 500 kVA. 2400 480 V, 50...
Problem (1): A 15-KVA, 2400:240-V, 60 Hz transformer has the following equivalent circuit parameters: R = 2.522 R2 = 0.02522 Xi = 722 X = 0.0712 Re = 32 kl Xm = 11.5 k12 If the transformer is supplying a 10-kW, 0.8 PF lagging load at rated voltage, assuming the output voltage is the reference, draw the transformer's exact equivalent circuit referred to the primary (H.V) side and use it to calculate: 1. The input current 2. The input voltage...
The short-circuit test readings for a 50-kVA 2400:240-V transformer are 48 V, 20.8 A, and 617 W, with the instruments located on the high-voltage side and the low-voltage side short- circuited. An open-circuit test with the low-voltage side energized gives instrument readings on that side of 240 V, 5.41 A, and 186 W. 1. Calculate the equivalent parameters of the transformer as referred to the high-voltage side. 2. Draw the equivalent approximate circuit of that transformer referred to the high...
A three phase 250 kVA 2400:415 V 50 Hz distribution transformer is constructed by connecting three single phase transformers in the Dynll vector group as shown in Fig.P1. The per phase equivalent circuit parameters on the high voltage side are: R1-0.72 Ω, Xi,-0.92 Ω, R2-0.70 Ω, Xp-0.90 Ω, R.-308.49 Ω, and X,,-44.61 Ω (a) Sketch the corresponding phasor diagram of the primary and secondary voltages for the Dynll vector group; lagging; terminal voltage is 415 V line to line, and...
3.) The equivalent low-side parameters of a 250-KVA, 4160480-V, 60 Hz transformer are Reals 0.00920 2 and Xeais 0.0433 12. The transformer is operating in the step-down mode and is delivering rated current at rated voltage to a 0.840 power-factor lagging load. Determine (a) the no- load voltage; (b) the actual input voltage at the high side; (c) the high-side current; (d) the input impedance; (e) the voltage regulation; the voltage regulation if the power factor of the load is...
(a) Describe the tests carried out on a single-phase transformer to determine its equivalent circuit parameters and explain how each parameter is determined based on the test results. (b) A 2200/220 V, 15 kVA, single phase transformer has the following equivalent circuit parameters: The HV winding resistance and leakage reactance are 0.2Ω and 0.3Ω respectively. The LV winding resistance and leakage reactance are 0.012Ω and 0.03 Ω respectively. The magnetic circuit resistance and reactance referred to the HV side are...
1) A single-phase 50-kVA, 2400/240 volt, 60 Hz distribution transformer is used as a step-down transformer at the load end of a 2400-volt feeder whose series impedance is (1.0+2.0) Ω. The equivalent series impedance of the transformer is (10+j25) Ω referred to the high voltage (primary) side. The transformer is delivering rated load at 0.8 power factor lagging and at rated secondary volitage. Neglect the transformer exciting curent. Using the transtormer raltings as base quantities work this problem in per...
can you calculate this question and explain why?
thanks
1. A 250-kVA, 11000/2200-V, 50-Hz, single-phase transformer has the following parameters: RI 1.3 , R2 0.05 , Rel 193 k2, X1 4.5 Q X2 0.16 2 I,- 80 kQ Xml (a) Draw the approximate equivalent circuit of the transformer showing all the circuit parameters referred to the low-voltage side. Use the approximate equivalent circuit to calculate the input voltage and voltage regulation of the transformer when it delivers full load at...
Question-2) A single phase 100 kVA, 100/1000 V transformer has the following results from the open- circuit and short-circuit tests. Open circuit Short Circuit Voltage 100V 50V Current 6A 100A Power 400W 1800W (a) Determine the rated parameters for the high voltage and low voltage sides. (b) Determine the circuit parameters and draw the equivalent circuit referred to the High Voltage side. (©) Determine the voltage regulation for a 0.8 power factor lagging at full load.
A 1.2 KVA, 480/120 V, 60Hz real step-down transformer has the following parameters that are all referred to the primary-side: the total copper loss R = 2.4 N, the core loss Rc = 2.4 K2, the magnetization reactance Xm = 2 K2, and all the leakages are negligible. Suppose that the output port in the secondary-side is operated at full-load and rated voltage with the unity power factor, i.e., p. f. = 1. (a) Draw its equivalent circuit; (b) Find...
For a 120/208 V, 60 VA single-phase transformer, the approximate equivalent circuit parameters, seen from the low voltage side, are given as: Re,-0.06 pu. Xeqー0.04 pu, R,-20.45 pm, Xm-35.5 pu Draw the approximate equivalent circuit and show all model components Using the base values of 3-120 V and SB-60 VA, compute: (a) Base current and impedance (b) Real values of the equivalent circuit parameters (c) Per-unit and the real values of the magnetizing current. Compute the voltage regulation and efficiency...