as Dbouk A Question 12 A 15 KVA, 10.8 KV/240-V, 60 Hz, single-phase conventional transformer is supplying 10 KW of power to a load at 0.85 Leading power factor, a load voltage of Not yet answered 240 Volts. Its Equivalent circuit is given below. Marked out of Calculate the magnitude of the input voltage of this transformer. 10.00 P Flag question 0.225 + j1.25 2 +o "as htes Vp 'ms 7682 j208.33 O Select one: O a. Vp = 10.11 KV O b. Vp = 11.26 KVv O c. V, = 10800 Volts O d. None

as Dbouk A Question 12 A 15 KVA, 10.8 KV/240-V, 60 Hz, single-phase conventional transformer is supplying 10 KW of power to a load at 0.85 Leading power factor, a load voltage of Not yet answered 240 Volts. Its Equivalent circuit is given below. Marked out of Calculate the magnitude of the input voltage of this transformer. 10.00 P Flag question 0.225 + j1.25 2 +o "as htes Vp 'ms 7682 j208.33 O Select one: O a. Vp = 10.11 KV O b. Vp = 11.26 KVv O c. V, = 10800 Volts O d. None

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 3.63P: A 23/230-kV step-up transformer feeds a three-phase transmission line, which in turn supplies a...

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Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.

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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.
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.
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