a) Two three-phase transformers have the following per unit secondary equivalent circuit parameters per phase, where the values have been derived from your student number using the same method as in Question 1: Transformer 1: 200 kVA R = 0.02X p. u. Transformer 2: 500 kVA R2 = 0.03Y p. u. %3D X = 0.09X p. u. X2 = 0.1Y p. u. X=2 y38 Calculate how the transformers share a load of 300 kVA at a power factor of 0.8X lagging when connected in parallel. State any assumptions which you make.

a) Two three-phase transformers have the following per unit secondary equivalent circuit parameters per phase, where the values have been derived from your student number using the same method as in Question 1: Transformer 1: 200 kVA R = 0.02X p. u. Transformer 2: 500 kVA R2 = 0.03Y p. u. %3D X = 0.09X p. u. X2 = 0.1Y p. u. X=2 y38 Calculate how the transformers share a load of 300 kVA at a power factor of 0.8X lagging when connected in parallel. State any assumptions which you make.

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 3.65P: Reconsider Problem 3.64 with the change that now Tb includes both a transformer of the same turns...

See similar textbooks

Related questions

Q: For this question you are to sketch two transformers (T1 and T2) side by side connected in PARALLEL.…

A: Schematic diagram requirements are - Two single phase transformer primary connection - Voltage…

Q: Two single-phase 11,000/400 V transformers have kVA ratings of 200 kVA and 100 kVA respectively. The…

Q: Look at the circuit in Figure 1 and determine the following: (a) Total Admittance. (b) Total…

A: We are authorized to answer three subparts at a time, since you have not mentioned which part you…

Q: 2.14 The resistances and leakage reactances of a 40-kVA 60-Hz 7.97-kV-V:240-V single-phase…

Q: AA-A three transformer bank, each of 10 KVA SL transformer become, disable and hence the circuit…

A: Since you have asked multiple questions in a single request, we will be answering only the first…

Q: A 50 Hz, Scott connected transformer supplies an unbalanced two phase load at ( 400 V) per phase.…

A: Scott connection is used to convert a balanced three-phase into balance 2 phases or vice versa. it…

Q: Draw the phasor diagrams for the following 3-phase components: 1-Transformer: exact equivalent…

Q: The three-phase ratings of a three-winding transformer are: Primary Y-connected, 66 kV, 24 MVA…

Q: In the system shown in Figure 1, the transformers are connected star-star with both star points…

A: It is given that: MVAbase=15XT1=XT2=XT3=0.04 pu

Q: Three single-phase transformers, each rated 10 MVA , 66.4/12.5 kV, 60 Hz , with an equivalent series…

A: Calculate the per unit current with respect to the base.

Q: Two 100-kW, single-phase transformers are connected in parallel both on the primary and secondary.…

A: In this question we need to find a load share by transformer

Q: The values of a phase measured from the no-load (no load) operation and short circuit test of a…

Q: Ql-phase step down transformer 1250 KVA, 1 1000/2200 V, 50 Hz .The resistance /phase and leakage…

Q: The resistance and reactance of the primary winding of a 440/110 V single phase transformer are 4.4…

Q: Connect three single-phase transformers in Y-Y, with subtractive polarity, so that the line-to-line…

A: Given: Connect three single-phase transformers in Y-Y, with subtractive polarity, so that the…

Q: A15 The rating of transformer is stated in terms of

A: In this question , we will writr rating of transformer..

Q: Two 100-kW, single-phase transformers are connected in parallel both on the primary and secondary.…

A: The solution is given below

Q: A 40 KVA, 1000 V/ 400 V, 50 Hz, single phase transformer has HV and LV side winding resistance as…

A: Given- 40 KVA, 1000 V/400 V, 50 Hz, single phase transformer, HV side winding resistance = 0.7 ohm,…

Q: Ql-phase step down transformer 1250 KVA, 1 1000/2200 V, 50 Hz .The resistance /phase and leakage…

Q: A 50 Hz, Scott connected transformer supplies an unbalanced two phase load at ( 400 V) per phase.…

A: Scott connection is used to convert a balanced three-phase into balance 2 phases or vice versa. It…

Q: Two 11,000/2,200-V, 1-phase transformers are connected in parallel to supply a total load of 200 at…

A: (1) (a) Current supplied by each transformer The equivalent circuit diagram of two transformers…

Q: A three-phase transformer bank is connected wye–delta. The primary voltage is 12,470 V, and the…

A: Yes, it is possible to connect the two remaining transformers in the open delta configuration in…

Q: Two transformers A and B of different ratings but equal voltage ratios share a load of 900 kVA at…

A: Load SL = 900 KVA 0.8 pf lagging transformer A rating is 600 KVA transformer B rating is…

Q: If two transformers are operated in parallel with voltage ratio of transformer A slightly greater…

Q: 2.14 The resistances and leakage reactances of a 40-kVA 60-Hz 7.97-kV-V:240-V single-phase…

A: Dear student kindly resubmit question for remaining part.Thank you! 2.14 The resistance and leakage…

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

Q: The zero-sequence impedance of a 3- transformer is shown below. The connection of its winding are: P…

A: It is given that:

Q: In single phase transformer, if the primary turns N1 is greater than the secondary turns N2, then…

A: N1>N2 Then V1>V2 C option are correct

Q: The nameplate on a 7.97-kV:266-V, 25-kVA single-phase transformer indicates that it has a series…

A: Given: Series reactance, Xs=7.5%=0.075pu V=7.97KV/266V S=25KVA a)Series reactance in both the sides.…

Q: No-load operation and short circuit tests were performed on three-phase, 50 Hz 480/220 delta / Y…

A: Giveen : No load Test Violtgae =480vCurrent =0.71 A Power =114 w Short circuit test : COltage = 10…

Q: Ql-phase step down transformer 1250 KVA, 10002200 V, 50 Hz The resistance /phase and leakage…

Q: Three transformers, e ach rated 25 MVA, 38. 1 /3.81 kV, are connected Star – Delta with a balanced…

A: Given: Three transformers, each rated 25 MVA, 38.1/3.81 kV, are connected Star – Delta with a…

Q: 2.Fringing effect is a phenomena occurs in. (a)Transformers. (bElectrical field. (e)Air gap (d)All…

A: As per the guidelines of Bartley we supposed to answer first three questions for MCQ type questions.

Q: 2. Given three identical ideal single-phase transformers with each rated at 100KVA and 7kV/3.5kV,…

Q: A 10 MVA three phase load is to be served by a three phase transformer at a line voltage of 13.8 kV.…

A: Transformer is the static device it is used to transfer the electrical power from one terminal to…

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

There is not enough space to save this document to
iCloud. Purchase additional storage or remove some
4 /7
documents from iCloud.
EN2709
Q2.
Two three-phase transformers have the following per unit secondary
equivalent circuit parameters per phase, where the values have been derived
from your student number using the same method as in Question 1:
a)
Transformer 1: 200 kVA
R = 0.02X p. u.
Transformer 2: 500 kVA
R2
=0.03Y p. u.
X = 0.09X p. u.
X2 = 0.1Y p. u.
X=2
y=8
Calculate how the transformers share a load of 300 kVA at a power factor of
08X lagging when connected in parallel. State any assumptions which you
make.

Expert Solution

This question has been solved!

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

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 3 images

SEE SOLUTION Check out a sample Q&A here

Follow-up Questions

Read through expert solutions to related follow-up questions below.

Follow-up Question

how was the load 300<-36.86 achieved?

Solution

by Bartleby Expert

SEE SOLUTION

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

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.
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
The per-unit equivalent circuit of two transformers Ta and Tb connected in parallel, with the same nominal voltage ratio and the same reactan of 0.1 per unit on the same base, is shown in Figure 3.43. Transformer Tb has a voltage-magnitude step-up toward the load of 1.05 times that of Ta (that is, the tap on the secondary winding of Tb is set to 1.05). The load is represented by 0.8+j0.6 per unit at a voltage V2=1.0/0 per unit. Determine the complex power in per unit transmitted to the load through each transformer, comment on how the transformers share the real and reactive powers.
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) -
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.
Reconsider Problem 3.64 with the change that now Tb includes both a transformer of the same turns ratio as Ta and a regulating transformer with a 4 phase shift. On the base of Ta, the impedance of the two comp onents of Tb is jO.1 per unit. Determine the complex power in per unit transmitted to the load through each transformer. Comment on how the transformers share the real and reactive pors.
In developing per-unit equivalent circuits for three-phase transformers. under balanced three-phase operation. (i) A common Sbase is selected for both the H and X terminals. (ii) The ratio of the voltage bases Vbase/VbaseX is selected to be equal to the ratio of the rated line-to-line voltages VratedHLL/VratedXLL. (a) Only one of the above is true. (b) Neither is true. (C) Both statements are true.
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) -.
Determine the positive- and negative-sequence phase shifts for the three- phase transformers shown in Figure 3.36.
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.
The ideal transformer windings are eliminated from the per-unit equivalent circuit of a transformer. (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.