Q.2: A 7KVA, 750/300-V, 50-Hz, single-phase transformer, the open and short circuit tests data are as following: O.C test: 300 V, 1.3 A, 320 W (L.V. side) S.C. test: 25 V, 20 A, 350 W (H.V. side) i. Obtain the parameters of the equivalent circuit, ii. Find the full-load copper and iron losses. iii. Calculate the efficiency of 60% of full-load at power factor 0.8 lagging.

Q.2: A 7KVA, 750/300-V, 50-Hz, single-phase transformer, the open and short circuit tests data are as following: O.C test: 300 V, 1.3 A, 320 W (L.V. side) S.C. test: 25 V, 20 A, 350 W (H.V. side) i. Obtain the parameters of the equivalent circuit, ii. Find the full-load copper and iron losses. iii. Calculate the efficiency of 60% of full-load at power factor 0.8 lagging.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A 50Hz, single phase transformer has a ratio of N2:N1 = 0.2. On full-load, the secondary current is 200A. The resistance and reactance of the primary winding are 0.8 ohm and 4 ohm respectively. The corresponding values for the secondary winding are 0.04 ohm and 0.1 ohm. If the secondary is short circuited, what voltage must be applied to the primary to produce full-load current? What will be the copper loss?
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Find the elements of the equivalent circuit relative to the secondary of a single-phase transformer. The no- load voltages in the primary and secondary circuit are 200 and 400 volts, respectively, and at a frequency of 50 Hz. The primary no-load current at a voltage of 200 volts is 0.7 amps and the losses in the core are 70 watts. The resistance and reactance of the primary are 3.2 and 1.25 ohms, respectively. Secondary resistance and reactance 6. 0, 0.07 ohms, respectively. Draw the equivalent circle, showing the values of its elements.
Q2/3-phase.E.W.C. R using center tap transformer supplies highly inductive load, find: 1. The average load voltage with and without FWD and discusses these cases. 2-lf firing angle equal to 45°, the supply voltage is240v, transformer ratio is (2/1). Calculate the DC current& voltage of this case. 3- Draw all waveforms diagram. 4- what are the difference between the type of connection (Delta or Star).
Example 1: A single-phase, 100-kVA, 1000:100-V, 60-Hz transformer has the following test results: Open-circuit test (HV side open): 100 V, 6 A, 400 W Short-circuit test (LV side shorted): 50 V, 100 A, 1800 W 1. Draw equivalent circuit of the transformer referred to the high-voltage side. Label impedances numerically in ohms and in per unit. 2. Determine the voltage regulation at rated secondary current with 0.6 power factor lagging. Assume the primary is supplied with rated voltage 3. Determine the efficiency of the transformer when the secondary current is 75% of its rated value and the power factor at the load is 0.8 lagging with a secondary voltage of 98 V across the load
Find the elements of the equivalent circuit relative to the secondary of a single-phase transformer. The no-load voltages in the primary and secondary circuits are 200,400 volts, respectively, at a frequency of 50 Hz The primary no-load current at voltage 200 equals 0.7 amps and pulp losses equal to 70 watts Primary resistance and reactance 3.2 , 1.25 In order, the reactance of the resistance and the coil 0.6 , 0.7 Then draw the equivalent circle, explaining the values
- A Transformer has primary windings as Np = 750 and secondary windings as Ns = 125. Its secondary voltage is Vs = 36V and output power of the transformer is PN= 3200W. The value of loses powers are Pcu = 43W and Pfe = 29 W. The resistance of loads are RLI = 1,250 and R12 = 0,88Q. (Pcu and PFE will be considered to be approximately the same in different load values.) Determine the following values in the circuit: Primary winding N, turns Secondary winding Ng turns Primary current Magnetic Flux, Secondary IsL s current ISL1 'Isl2 Primary voltage Secondary voltage RL1 R12 Transformer Core (a) the primary voltage Vr, (b) the secondary load currents ISLı and Isl2 if the transformer is rated at RLI and R12, (c) the resulting secondary power PSL, (d) the resulting primary power PPl, (e) the primary load current IPL, (f) efficiency nL
Q6 Complete the answer : If connected .................... to the transformer changes, copper loss varies.
Q2/A/ What are the conditions for satisfying parallel operation of single phase transformer? Deduce an expression for the load shared by the two transformers in parallel when the transformers have equal voltage ratio? Prove your answer. B/ A 50 KVA, 2300/230 V, 60 11z transformer has a high voltage winding resistance of 0.650 and a low-voltage winding resistance of 0.0065 2. Laboratory tests showed the following results: Open circuit test: V = = 230 V, I =5.7A, P = 190 W Short circuit test: V-41.5 V, I-21.7 A, P-No wattmeter was used. 18 (2) Compute the value of primary voltage needed to give rated secondary voltage when the transformer is connected as a step-up one and is delivering 50 KVA at a power factor of 0.8 lagging. (b) Compute the efficiency under conditions of part (a).