In a 100 kVA, 1100/220 V, 50 Hz single-phase transformer with 2000 turns on the high-voltage side, the open-circuit test result gives 220 V, 91 A, 5 kW on low-voltage side. The core-loss component of current is, approximately

In a 100 kVA, 1100/220 V, 50 Hz single-phase transformer with 2000 turns on the high-voltage side, the open-circuit test result gives 220 V, 91 A, 5 kW on low-voltage side. The core-loss component of current is, approximately

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 3.26P: A bank of three single-phase transformers, each rated 30MVA,38.1/3.81kV, are connected in Y- with a...

See similar textbooks

Related questions

Q: True or False? Consider a 3 phase transformer with same line to line voltage ratio. The delta…

A: Delta to Delta transformer: The primary phase current is,I1=13IL1The secondary phase currennt…

Q: Derive the equation of induced voltage in secondary winding of transformer (load side).

Q: If the open circuit voltage is 239V and the full load voltage is 205V, then the percentage…

A: Voltage Regulation is nothing but ratio of drop in voltage from no load to full load to full load…

Q: Equivalent circuit diagram and electromotive force phasor for the idle operation of a step-up phase…

A: A transformer is a static device, it consist of two winding interlinked by common magnetic circuit…

Q: A 12-kVA, 240/120-V conventional transformer is to be reconnected as auto-transformer to supply…

A: Connect the auto transformer winding as below

Q: ii) Derive the expression of EMF induced in a Transformer? Why is a transformer rated in KVA?

A: The basic circuit of the transformer is shown below: In the above circuit: Current losses are…

Q: Consider the following short circuit transformer as shown in figure below which operate at: the…

A: The solution is given below

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: 1) How can you prove that Lsec = Lan (RI/ Rs) for matching impedance with the ideal transformer?

A: We are authorized to answer the only single question at a time since you have not mentioned which…

Q: iii. No-load current 3. If the ratio of V/F has been kept constant and the observed value of…

A: Q.1) Explanation 1)When the frequency is lowered (for slower motor speed), the magnetic field…

Q: The diagram for a single phase 60 MVA transformer is given below. Convert it to a Step-down…

A: Design the step down autotransformer Single phase transformer have 60MVA 50/100kV Find the all…

Q: If the open circuit voltage is 227V and the full load voltage is 207V, then the percentage…

Q: If a 50-turn transformer winding has a 120-V rms applied voltage, and if the peak coupling flux is…

A: Given values are - TurnsN=50Vt=120VoltFluxϕ=20mWb

Q: What conclusions you can come up with after implementing open circuit test on single phase…

A: Conclusions from open circuit test on single phase transformer

Q: Example: A single-phase, 100-kVA, 1000:100-V, 60-Hz transformer has the following test results:…

A: TRANSFORMER: The transformer transfers power from one circuit to another circuit without a change…

Q: Derive step by step, the electromotive force equation for a single-phase transformer.

Q: - When a 100-kVA single-phase transformer was tested in this way, the following data were obtained:…

Q: A three-phase transformer is given. The number of turns of the high voltage winding is N1=850 and…

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

A: "Since you have posted a question with multiple sub parts we will solve first three subpart for you…

Q: Detailed conclusions we can come up with after conducting open circuit test on single phase…

A: According to the question we have to, Detailed conclusions we can come up with after conducting an…

Q: 10 A three-phase transformer is given. The number of turns of the high voltage winding is N1=850 and…

A: In this question we need to find a type of winding connected in LV side.

Q: If the open circuit voltage is 225V and the full load voltage is 214V, then the percentage…

A: Percentage regulation is given by R R = (VOC - VFL ) / VFL VOC = Open circuit voltage VFL =…

Q: Explain the importance of transformer and basic insulation level in the distribution system. Justify…

A: The detailed answer to the given question is solved below according to the given parameters and…

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

Q: . - what information could be obtained from open circuit test on single phase transformer? · what is…

A: Open circuit test is also known as No load test. It is perform by opening the primary of transformer…

Q: (a) (i) List categories of transformer. (ii) What are the losses that need to be considered when…

A: Transformer used to transfer energy from one device to another and it works on the faraday's law of…

Q: In a 1-phase transformer of 20 KVA, 2000/200 volts, the iron and copper losses are 400 W and 500 W…

Q: Calculate voltage ratio and turn ratio of a 3-phase transformer with data: VIN=6kV, V2N=400V, Dy,

A: We are authorized to answer one question at a time, since you have not mentioned which question you…

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: For an ideal 2-winding transformer, the armpere-turns of the primary winding, N1/1, is equal to the…

A: For the magnetic circuit, the magneto-motive force is given as:

Q: Q/ The efficiency of a 400-kVA, single-phase, 60-Hz transformer is 98.77% when delivering full-load…

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

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

Q: 1. Why is it not adjustable to carry or the same experiment for large transformers? 2. What method…

A: 1) Large transformers need large supply voltages which is difficult to achieve in an experimental…

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: 4- When a 100-kVA single-phase transformer was tested in this way, the following data were obtained:…

A: The efficiency of a transformer is a measurement of the performance factor of the windings. This…

Q: As given in the figure, an ideal transformer with a 2: 1 winding ratio is fed from a 240 Volt source…

Q: at happens if one phase of a 3-phase transformer fails?

A: Primary delta connected and secondary star connected: If the primary (delta) side loses one phase of…

Q: A 230/400 V single-phase transformer absorbs 35 W when its primary winding is connected to a 230 V,…

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: Let a 5-kVA, 400/200-V transformer be approximately represented by a 2-2 reactance referred to the…

A: Equivalent model oftransformer- Since no load current is very small 2 to 5% of full load current. No…

Q: Here is a single phase transformer, 15 kVA, 15000/380 V, 50 Hz has Ze-0.02+j0.05 perunit, R. 50…

Q: The core of a 30, 50-Hz, 11000/550-V, A-Y, 300 kVA, core-type transformer operates with a flux of…

A: In this question we will find full load high voltage phase current....

Q: A 5000-VA, 480/120-V conventional two-winding transformer is to be used to supply power from a 600-V…

Q: A 20-KVA, 20,000/480-V, 60-Hz distribution transformer is tested with the following results:…

A: Given Parameters of a distribution transformer. We need to sketch the per equivalent circuit.…

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

Q: 5. Write down the equations of a single phase transformer at no-load mode. Give the names of the…

A: Transformer is a static device which is used to step up or down the voltage level or current level.…

Concept explainers

Three-Phase Transformers

Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.

Transformer

Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.

Question

In a 100 kVA, 1100/220 V, 50 Hz single-phase
transformer with 2000 turns on the high-voltage
side, the open-circuit test result gives 220 V,
91 A, 5 kW on low-voltage side. The core-loss
component of current is, approximately

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

The direct electrical connection of the windings allows transient over voltages to pass through the auto transfonner more easily, and that is an important disadvantage of the autotransformer. (a) True (b) False
Three single-phase two-winding transformers, each rated 3kVA,220/110volts,60Hz, with a 0.10 per-unit leakage reactance, are connected as a three-phase extended autotransformer bank, as shown in Figure 3.36(c). The low-voltage winding has a 110 volt rating. (a) Draw the positive-sequence phasor diagram and show that the high-voltage winding has a 479.5 volt rating. (b) A three-phase load connected to the low-voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high-voltage terminals. Assume positive-sequence operation.
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
Consider three ideal single-phase transformers (with a voltage gain of ) put together as three-phase bank as shown in Figure 3.35. Assuming positive-sequence voltages for Va,Vb, and Vc find Va,Vb, and VC. in terms of Va,Vb, and Vc, respectively. (a) Would such relationships hold for the line voltages as well? (b) Looking into the current relationships, express IaIb and Ic in terms of IaIb and Ic respectively. (C) Let S and S be the per-phase complex power output and input. respectively. Find S in terms of S.
Three single-phase two-winding transformers, each rated 25MVA,54.2/5.42kV, are connected to form a three-phase Y- bank with a balanced Y-connected resistive load of 0.6 per phase on the low-voltage side. By choosing a base of 75 MVA (three phase) and 94 kV (line-to-line) for the high-voltage side of the transformer bank, specify the base quantities for the low-voltage side. Determine the per-unit resistance of the load on the base for the low-voltage side. Then determine the load resistance RL in ohms referred to the high-voltage side and the per-unit value of this load resistance on the chosen base.
Consider a single-phase electric system shown in Figure 3.33. Transformers are rated as follows: XY15MVA,13.8/138kV, leakage reactance 10 YZ15MVA,138/69kV, leakage reactance 8 With the base in circuit Y chosen as 15MVA,138kV determine the per-unit impedance of the 500 resistive load in circuit Z, referred to circuits Z, Y, and X. Neglecting magnetizing currents, transformer resistances, and line impedances, draw the impedance diagram in per unit.
Consider a three-phase generator rated 300MVA,23kV, supplying a system load of 240 MA and 0.9 power factor lagging at 230 kV through a 330MVA,23/230Y-kV step-up transformer with a leakage reactance of 0.11 per unit. (a) Neglecting the exciting current and choosing base values at the load of 100 MVL and 230 kV. Find the phasor currents IA,IB, and IC supplied to the load in per unit. (b) By choosing the load terminal voltage IA as reference, specify the proper base for the generator circuit and determine the generator voltage V as well as the phasor currents IA,IB, and IC, from the generator. (Note: Take into account the phase shift of the transformer.) (C) Find the generator terminal voltage in kV and the real power supplied by the generator in MW. (d) By omitting the transformer phase shift altogether, check to see whether you get the same magnitude of generator terminal voltage and real power delivered by the generator.
Consider a bank of this single-phase two-winding transformers whose high-voltage terminals are connected to a three-phase, 13.8-kV feeder. The low-voltage terminals are connected to a three-phase substation load rated 2.0 MVA and 2.5 kV. Determine the required voltage, current, and MVA ratings of both windings of each transformer, when the high-voltage/low- voltage windings are connected (a) Y-, (b) -Y, (c) Y-Y, and (d) -.
In per-unit equivalent circuits of practical three-phase transformers, under balanced thr-phase operation, in which of the following connect ions would a phase-shifting transformer come up? (a) Y-Y (b) Y- (c) -
Consider the oneline diagram shown in Figure 3.40. The three-phase transformer bank is made up of three identical single-phase transformers, each specified by X1=0.24 (on the low-voltage side), negligible resistance and magnetizing current, and turns ratio =N2/N1=10. The transformer bank is delivering 100 MW at 0.8 p.f. lagging to a substation bus whose voltage is 230 kV. (a) Determine the primary current magnitude, primary voltage (line-to-line) magnitude, and the three-phase complex power supplied by the generator. Choose the line-to-neutral voltage at the bus, Va as the reference Account for the phase shift, and assume positive-sequence operation. (b) Find the phase shift between the primary and secondary voltages.
Consider two interconnected voltage sources connected by a line of impedance Z=jX, as shown in Figure 2.27. (a) Obtain expressions for P12 and Q12. (b) Determine the maximum power transfer and the condition for it to
For a balanced three-phase positive-sequence currents Ia,Ib,Ic, does the equation Ia+Ib+Ic=0 hold good?