Answered: A 150-kVA simple-phase transformer has…

A 150-kVA simple-phase transformer has a core loss of a 1.5kW and a full-load Cu loss of 2 kW. Calculate the efficiency of the transformer (a)at full load,0.8 p.f lagging.(b) at one-half full-load

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 3.14MCQ: The ideal transformer windings are eliminated from the per-unit equivalent circuit of a transformer....

See similar textbooks

Related questions

Q: A 10 kVA, 2400/240 V, 60 Hz single phase transformer has Z, = 5.2 + j12.5 ohms and Z2 = 0.06 + j0.12…

A: In this question, We need to calculate the load voltage if Primary voltage and frequency is rated.…

Q: Excitation arm parameters of 1000V/400V single phase transformer with 15kVA power: Xm = 6kΩ an Given…

A: Given ;1000/400 V1-ϕ transformer with a power 15KVA,Xeq=6 K ohm Re=20 Kohm a)Electrical equivalent…

Q: If the open circuit voltage is 225V and the full load voltage is 200V, then the percentage…

Q: Q14 An ideal transformer is rated at 2700/12O 9.6KVA, and has 5o turns on the seund side. Caleulate…

A: Transformer is static device which work on Faraday's Law of electromagnetic induction. The secondary…

Q: A 200 – MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent…

Q: A 3300/230 V, 50-kVA, transformer is found to have impedance of 4% and a Cu loss of 1.8% at…

A: Given data, A 3300/230 V, 50-kVA transformer percentage impedance = 4% and Cu loss = 1.8% at…

Q: A 200 – MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent…

A: Part (1): Consider the base voltage to be 15 V and the base MVA to be 200 MVA. Since the base…

Q: Consider a single phase 2-winding 150 kVA, 2400/240 V, 60 Hz transformer with Reg = 0.00425 N, Xeq =…

A: In this question, Find the efficiency of the transformer If it's operated at rated current and…

Q: An 11,000/230-V, 150-kVA, 50-Hz, 1-phase transformer has a core loss of 1.4 kW and full-load Cu loss…

Q: b) A single-phase transformer with 10: 1 turns-ratio and rated at 50 kVA, 2400-V/240-V, 50-Hz is…

A: (b): Given in the question: Turns ratio: N1N2=101 Voltage on the primary side is: V1 = 2400V Voltage…

Q: An 11,000/230-V, 150-kVA, 50-Hz, 1-phase transformer has a core loss of 1.4 kW and full-load Culoss…

A: In this question , transformer cu loss and iron loss given..Output KVA given..We have to find out…

Q: . A 10 kVA, single-phase, 2400-V:120-V, 60 Hz transformer has an equivalent impedance referred to LV…

A: Given a single phase transformer with the following values 10 KVA ,2400v/120v ,60 Hz Core loss…

Q: In a 100 kVA, 1100/220 V, 50 Hz single-phase transformer with 2000 turns on the high-voltage side,…

A: The solution is given below.

Q: A transformer takes a No load current of 0.29 A and power factor of 0.405 lag, when its primary is…

A: Given, No load current (Io)= 0.29 A No load power factor= 0.405 lagging No load supply voltage…

Q: (a) A 5 MVA 230/10.5-kV single-phase power transformer has a per-unit resistance of 1.5% and a…

Q: A single-phase l0-kVA, 480/1120 -V transformer is to be used as an auto transformer tying a 600V…

Q: A 100-kVA, 4800-480-V, 60-Hz, single-phhase distributión has 6 V/turn and an equivalent impedance…

A: Given data: Impedance referred to the high side : 8.48 Ω Output power required: 50 KVA Primary…

Q: A single-phase 100-kVA, 2,400/240 V, 60-Hz distribution transformer is used as a step-down…

A: As per the guidelines, the first 3 sub-parts have been solved. (a). The value of the turns ratio…

Q: 60 KVA, 415-220 V, 50 Hz transformer I.(exciting current)=2% of the rated current current at 0.75…

Q: (b) A 50-kVA, 2600/1300-V, single-phase transformer has a core loss of 780 W. The transformer has a…

Q: QI An 11,000/230-V, 150-kVA, 50-Hz, 1-phase transformer has a core loss of 1.4 kW and full-load…

A: Given data: Core loss = 1.4 kW Full load Copper loss= 1.6 kW Full load KVA =150 Power factor…

Q: a. Find the full-load regulation of this transformer at a power factor of 0.8 lagging. b. Find the…

Q: The per-unit system calculations method allows to: Select one: O a. eliminate the need for explicit…

A: Most of human energy requirement is meet by generating electrical energy. Once electrical energy is…

Q: The efficiency of a 400 kVA, 1-phase transformer is 95 % when delivering full load at 0.8 power…

Q: A two-winding transformer is rated at 60-kVA, 240/1200-V, 60-Hz. When operated as a conventional…

A: It s given that: KVA=60V1V2=2401200f=60 Hzcosϕ=0.8 V1V2Auto=2401200

Q: A 5 kVA, 50 Hz single phase transformer has ratio 200/400V. The data taken on the LV side at rated…

Q: A 400/100 V, 5 kVA single-phase two winding transformer is to be used as an auto-transformer to…

A: It is given that: two winding transformer:400/100 Vcosϕ=0.8 laggingη=0.95 %Auto transformer:500/400

Q: A 2000/400 V, 100 kVA, 60 Hz step-down single-phase transformer has a primary and secondary…

Q: Illustrate the equivalent circuit of this transformer referred to the high voltage side of the…

Q: Quiz2: We wish to connect a 6 kVA, 120/240 V transformer as an autotransformer to a 120 V source to…

Q: A two-winding transformer is rated at 60-kVA, 240/1200-V, 60-Hz. When operated as a conventional…

Q: 1. A quantity is expressed in per unit if it is divided by a chosen base quantity having the same…

A: Given, Base power= 10 KW Base Voltage (HV)=2400 V Base voltage (LV)=240 V Base current (LV)=Base…

Q: transformer with a 10:1 ratio and rated at 60kVA, 2200/220V, 60Hz is used to step down the voltage…

Q: A 600 kVA, 1-phase transformer has an efficiency of 92 % both at full-load and half- load at unity…

A: Given, Output kVA rating = 600 kVA Efficiency, η=92 % (both at full-load and half-load) Power…

Q: A transformer on no-load has a core-loss of 20 W, draws a current of 1 A (rms) and has an induced…

A: According to guidelines we need to solve only the first question. According to the question we have…

Q: A 11000/230 V, 150-kVA, 1-phase, 50-Hz transformer has core loss of 1.4 kW and full load copper loss…

A: The solution is given below

Q: A single-phase ideal transformer is rated at 2KVA, 240V/120V. The transformer is supplying rated…

A: A single phase transformer has, Apparent power (S) = 2 kVA Voltage ratio is 240/120 V. Load…

Q: 1. A 10 kVA, single-phase, 2400-V:120-V, 60 Hz transformer has ar LV side of 0.01 + j0.09 Q. This…

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and…

Q: A transformer has a reactive drop of 6% and a resistive drop of 2.5%. Determine the lagging power…

A: The voltage regulation is given by the expression as shown below: In terms of the values of the…

Q: (a) A 220 / 400V, 14KVA, 50HZ single phase transformer has at full load, a copper load of 140W. If…

Q: The primary and secondary windings of a 500-kVA, 11-kV/415-V, single-phase transformer have…

Q: A 100,000-kVA 230/115-kV ∆-∆ three-phase power transformer has a per-unit resistance of 0.02 pu and…

A: Given Data Rating 100,000-kVA 230/115-kV Type : ∆-∆ three-phase per-unit resistance = 0.02 pu…

Q: A 240-kVA, 480/4800-V, step-up transformer has the following constants: Rs = 2.5 Ω, Xs = j5.75 Ω, Rp…

A: Given step up Transformer with240 KVA, 480/4800 vRs=2.5 Ω,Xs=j5.75 ΩRp=25 mΩ,Xp=j57.5 ΩThe core…

Q: A 15-kVA, 2300/230- Question-2 !* V transformer has the following resistances and leakage…

A: As per the guidelines of Bartley we supposed to answer first three subpart only

Q: (b) A 40-kVA, 2600/1300-V, single-phase transformer has a core loss of 620 W. The transformer has a…

A: The solution is given below

Concept explainers

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.

Question

A 150-kVA simple-phase transformer has a core loss of a 1.5kW and a full-load Cu loss of 2 kW.

Calculate the efficiency of the transformer (a)at full load,0.8 p.f lagging.(b) at one-half full-load

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.

Similar questions

For a short-circuit test on a 2-winding transformer, with one winding shorted, can you apply the rated voltage on the other winding? (a) Yes (b) No
An ideal transformer has no real or reactive power loss. (a) True (b) False
In developing per-unit circuits of systems such as the one shown in Figure 3.10. when moving across a transformer, the voltage base is changed in proportion to the transformer voltage ratings. (a) True (b) False
A 23/230-kV step-up transformer feeds a three-phase transmission line, which in turn supplies a 150-MVA,0.8 lagging power factor load through a step-down 230/23-kV transformer. The impedance of the line and transformers at 230kVis18+j60. Determine the tap setting for each transformer to maintain the voltage at the load at 23 kV.
Consider an ideal transformer with N1=3000andN2=1000 turns. Let winding 1 be connected to a source whose voltage is e1(t)=100(1| t |)volts for 1t1ande1(t)=0 for | t |1 second. A2- farad capacitor is connected across winding 2. Sketch e1(t),e2(t),i1(t),andi2(t) versus time t.
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 ideal transformer windings are eliminated from the per-unit equivalent circuit of a transformer. (a) True (b) False
The symbol shown is a(n) a. iron core transformer. b. auto transformer. c. current transformer. d. air core transformer.
For the transformer in Problem 3.10. The open-circuit test with 11.5 kV applied results in a power input of 65 kW and a current of 30 A. Compute the values for GcandBm in siemens referred to the high-voltage winding. Compute the efficiency of the transformer for a load of 10 MW at 0.8 p.f. lagging at rated voltage.
Three single-phase, two-winding transformers, each rated 450MVA,20kV/288.7kV, with leakage reactance Xeq=0.10perunit, are connected to form a three-phase bank. The high-voltage windings are connected in Y with a solidly grounded neutral. Draw the per-unit equivalent circuit if the low-voltage windings are connected (a) in with American standard phase shift or (b) in Y with an open neutral. Use the transformer ratings as base quantities. Winding resistances and exciting current are neglected.
For developing per-unit equivalent circuits of single-phase three-winding transformer, a common Sbase is selected for all three windings and voltage bases are selected in proportion to the rated voltage of the windings (a) True (b) False
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.