A 75 KVA, 1800/600 V, 3-phase transformer is connected as Delta-Wye. What is the turns ratio of this transformer? Answer The turns ratio is:
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- For an ideal transformer, the efficiency is (a) 0 (b) 100 (c) 50The symbol shown is a(n) a. iron core transformer. b. auto transformer. c. current transformer. d. air core transformer.An open-delta three-phase transformer system has one transformer center-tapped to provide a neutral for single-phase voltages. If the voltage from line to center tap is 277 V, what is the high-leg voltage?
- In the circuit in Figure 2, the capacitor connected to the a-b terminals of the transformer anda circuit consisting of resistance is defined as a load circuit. a)Find the average power spent by the load circuit? b) How much of the average power calculated in a) by the resistance in the load circuit and how muchspent by the capacitor? Comment on the results obtained?Q10) For the transformer shown in Figure below, determine (i) The turns ratio of the transformer (ii) The secondary current (iii) The voltage across the load R = 10k2 (iv) The voltage across the primary winding Ip = 3A Is = ? Ns = 20 turns RL Np = 60 turns 10k2 ellle lelllThe equivalent circuit impedances of a 20-kVA, 8000/240-V, 60-Hz transformer are to be determined. The open-circuit test and the short- circuit test were performed on the primary side of the transformer, and the following data were taken: Open-circuit test (on primary) Short-circuit test (on primary) 8000 V V= 489 V I0.214 A 2.5 A P= 400 W P= 240 W Find the impedances of the approximate equivalent circuit referred to the primary side, and sketch the circuit.
- A 100/S00 V. 1 KVA, 50 Hz transformer was put through open and short-circuit tests to find its internal parameters. The test conditions and derived parameters are as follows Open circut test: The high voltage side terminals were open. The low voltäge side was connected to 10020ª, 50 Hz supply. The low voltage side current was measured as 50245º MA. Short-circuit test The high voltage side terminals were short-circuited. The low voltage side was connected to a variable voltage supply (50 Hz). A full load current of 102-30° A was achieved when the variable voltage supply was at 820° V. The transformer was then put to operation by connecting a load of 400230° 2 to the high voltage side (secondary) while applying a primary voltage of 10020º V. Calculate the primary current (the current drawn from the power supply).74. The eddy-current loss in a 6.9 kV, 50 Hz transformer is 220 W. What will be the eddy-current loss of this transformer if it is to be connected across a 6.6 kV, 60 Hz source? A. 201 W C. 234 W B. 224 W D. 212 WA three-winding transformer is connected to an AC voltage source as shown in the figure. The number of turns is as follows: N₁ = 100, N₂ = 50, N3 = 50. If the magnetizing current is neglected, and the currents in two windings on secondary side are 2230° and 22150°, then what is the value of the primary current in Ampere? I 0000000000- N₁ № ₂ Z 00000 00000 Z N3 H I₁₂ I₁₂₁ ¹3
- A three-phase transformer is given. The number of turns of the high voltage winding is N1=850 and the number of turns of the low voltage winding is N2=34. The high voltage winding is energized with V1= 10 kV rms line-to-line and V2= 400 V rms line-to-line has been taken from the low voltage winding. What is the connection of the low voltage winding if the high voltage winding is Y-connected? *A 75 KVA, 24000/480 V, 3-phase transformer is connected in A-Y. The open-circuit test was performed on its low-voltage side and the following data were recorded. VLine, oc= 480 V, Line.oc=4.0 A, P3.00=825 W Find the per-phase value of the impedance in Ohms on the LVS. Answers The Core Resistance is: Ohms The Magnetizing Reactance is: Ohms.The circuit diagram of a wye wye transformer is shown below. It has a neutral to ground resistor in the right side winding. Again, the transformer turns ratio is 1 in this problem. Calculate the currents IA, IB and IC for the zero sequence currents Ia=Ib=Ic=1/0o Calculate the current in neutral resistor Rn, and the voltage across this resistor. Calculate the neutral to ground current in the right side winding. What is the value of the neutral to ground current in the right side winding when Rn is replaced by an open circuit? Draw the zero sequence circuit of this transformer, and show the zero sequence current flow in this diagram when Rn is finite.
