Problem 4 A single-phase, 10KVA, 2200/220V transformer has the following parameters: R1=4.0 N, R2=0.04 Q, X1=5.0 Q, X2=0.05 N, Rc1=35 k Q, Xm1=4.0k 2 The transformer is supplying its rated current to a load at 220V and 0.8 pf lagging. Draw the equivalent circuit of this transformer, showing values of the elements referred to the primary side. 1) Determine the input voltage of transformer 2) Calculate the transformer voltage regulation 3) Find the efficiency of the transformer.

Problem 4 A single-phase, 10KVA, 2200/220V transformer has the following parameters: R1=4.0 N, R2=0.04 Q, X1=5.0 Q, X2=0.05 N, Rc1=35 k Q, Xm1=4.0k 2 The transformer is supplying its rated current to a load at 220V and 0.8 pf lagging. Draw the equivalent circuit of this transformer, showing values of the elements referred to the primary side. 1) Determine the input voltage of transformer 2) Calculate the transformer voltage regulation 3) Find the efficiency of the transformer.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.57P: A two-winding single-phase transformer rated 60kVA,240/1200V,60Hz, has an efficiency of 0.96 when...

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A single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding: R1=0.75 Resistance of the 240-V winding: R2=0.0075 Leakage reactance of the 2400-V winding: X1=1.0 Leakage reactance of the 240-V winding: X2=0.01 Exciting admittance on the 240-V side =0.003j0.02S (a) Draw the equivalent circuit referred to the high-voltage side of the transformer. (b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.
For an ideal transformer, the efficiency is (a) 0 (b) 100 (c) 50
(a) An ideal single-phase two-winding transformer with turns ratio at=N1/N2 is connected with a series impedance Z2 across winding 2. If one wants to replace Z2, with a series impedance Z1 across winding 1 and keep the terminal behavior of the two circuits to be identical, find Z1 in terms of Z2. (b) Would the above result be true if instead of a series impedance there is a shunt impedance? (c) Can one refer a ladder network on the secondary (2) side to the primary (1) side simply by multiplying every impedance byat2 ?
The ratings of a three-phase three-winding transformer are Primary(1): Y connected 66kV,15MVA Secondary (2): Y connected, 13.2kV,10MVA Tertiary (3): A connected, 2.3kV,5MVA Neglecting winding resistances and exciting current, the per-unit leakage reactances are X12=0.08 on a 15-MVA,66-kV base X13=0.10 on a 15-MVA,66-kV base X23=0.09 on a 10-MVA,13.2-kV base (a) Determine the per-unit reactances X1,X2,X3 of the equivalent circuit on a 15-MVA,66-kV base at the primary terminals. (b) Purely resistive loads of 7.5 MW at 13.2 kV and 5 MW at 2.3kV are connected to the secondary and tertiary sides of the transformer, respectively. Draw the per- unit impedance diagram, showing the per-unit impedances on a 15-MVA,66-kV base at the primary terminals.
Rework Example 3.12 for a+10 tap, providing a 10 increase for the high-voltage winding.
A two-winding single-phase transformer rated 60kVA,240/1200V,60Hz, has an efficiency of 0.96 when operated at rated load, 0.8 power factor lagging. This transformer is to be utilized as a 1440/1200-V step-down autotransformer in a power distribution system. (a) Find the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the ratings as a two-winding transformer. Assume an ideal transformer. (b) Determine the efficiency of the autotransformer with the kVA loading of part (a) and 0.8 power factor leading.
All values of a transformer are proportional to its __________________ ___________________.
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?
A single phase transformer is rated 1.2 kV/120 V; 7.2 kVA yields the following test results; Open-circuit test: V2=120V; I2=1.2A; P2=40W Short-circuit test: V1=20V; I1=6A; P1=36W Determine: a) The parameters R, X, Z, G, B and Y referred to the primary (1.2KV) side. b) Sketch equivalent circuit of the transformer from primary side and show all parameters that you have calculated in (a). c) The efficiency of the transformer when it delivers 5.4 kW at 120V and 0.9 power factor. d) The voltage regulation of the transformer when it is delivering 6 kW to load at 120 V and 0.8 power-factor lagging.
Problem 2 (Transformer): The following are the open circuit and short circuit test data of a single-phase, 10 kVA, 2200/220V, 60 Hz transformer O/C Test (HV sideS/C Test (LV side Open) Shorted) Voltmeter Ammeter Wattmeter 220V 2.5A 100W 150V 4.55A 215W 1. Find the equivalent circuit with respect to HV and LV side 2. Find the efficiency and the voltage regulation of the transformer when supplying rated load at 0.8 pf lag. 3. Maximum efficiency and voltage regulation.
No-load operation and short circuit tests were performed on three-phase, 50 Hz 480/220 delta / Y connected transformer. In these testsThe line voltage, line current and three-phase total power have been measured from the high voltage windings and the test results are below.pictures. 100 A DC current when 1.08 V DC voltage from non-transferable software is applied to the low voltage windingshas attracted.Find the single phase equivalent circuit parameters of this transformer.idle test:Voltage: 480V Power:114w current: 0.71Ashort circiut test:V: 10v P: 78w c: 18.3a
Equivalent circuit parameters reduced to single phase and reflected to the primary r1 = 22Ω , r2' = 18Ω ,x1 = x2' = 100Ω , Rc = 150 , Xm = 750 three-phase, 50Hz, Y/∆ connected, 60kVA, 4000V:400Va transformer feeds a full load with a power factor cosφ2=0.6 back on its secondary at its rated values.For this study, the transformer's total iron and copper losses, total input and output powers, efficiency andCalculate the regulation. Use approximately equivalent circuit.