The line-to-ground voltages on the high voltage side of a step-up transformer are 100 KVZ0° , 33 kVZ-100° and 38 kVZ176.5° on phases a, b and c respectively. Determine the symmetrical components of voltage of phase a and phase b. Draw the negativesequence phasor diagram.

The line-to-ground voltages on the high voltage side of a step-up transformer are 100 kV Z0° , 33 kVL-100° and 38 KVL176.5° on phases a, b and c respectively. Determine the symmetrical components of voltage of phase a and phase b. Draw the negative sequence phasor diagram.

The line-to-ground voltages on the high voltage side of a step-up transformer are 100 kV Z0° , 33 kVL-100° and 38 KVL176.5° on phases a, b and c respectively. Determine the symmetrical components of voltage of phase a and phase b. Draw the negative sequence phasor diagram.

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: A 40-kΩ resistance in series with a 20kΩ capacitive resistance is connected to the secondary side of…

Q: A three phase Y/A transformer rated at 50 MVA, 230/34.5 kV is to be protected using biased…

Q: Explain the open circuit test on single phase transformer.

A: Open circuit test :- It is carried out at rated frequency & rated voltage to determine the core…

Q: - Why polarity checking is necessary for the parallel operation of single phase transformer.

A: Hello. Since you have posted multiple questions and not specified which question to solve. We will…

Q: At 50 Hz operation, a single-phase transformer has hysteresis loss of 200 W and eddy current loss of…

A: Given values of loss at 50 (Hz) frequency are - Hysteresis lossPH50=200WEddy current lossPE50=100W…

Q: Insulation detorioration of transformer winding due to high temprature is an incepient fault O True…

A: Insulation deterioration of transformer winding due to high temperature is an incipient fault Is it…

Q: Neglecting resistance, transformer phase shift, and magnetizing reac- tance, draw the equivalent…

Q: The full load voltage drop in a single phase transformer are 2% and 4% due respectively to…

A: Given values are - Voltage dropR%=2%%R=2%Voltage dropX%=4%%X=4%

Q: Why it's improctical carry out actual load test on large rating transformer

A: When a huge transformer is fully loaded, it can carry a lot of current and voltage. As a result,…

Q: What is the difference between transformer and 3ph asynchronous motor

A: The primary and secondary windings of a transformer are known as the stator and secondary windings…

Q: (B) / Draw the simplified equivalent circuit of single phase transformer referred to primary an…

A: In this question , we have to find simplified equivalent circuit of single phase transformer…

Q: "Under saturated core condition, transformer become a source of harmonics" True False

A: In this question , we will write about harmonics in transformer..

Q: A single phase transformer with the maximum value of flux 0.0991wb and an effective cross sectional…

Q: Draw the vector of a single phase transformer for full load lagging power factor condition of the…

A: The vector of a single phase transformer for full load lagging power factor condition of the load

Q: The shell type transformer has less leakage flux compared to the core type transformer True False

A: In the question, choose the correct option? "The shell type transformer has less leakage flux…

Q: Derive physically the reason of the phase shift in three phase transformer and show the phase shift…

A: The given problem can be laid down into parts. Firstly, the reason of the phase shift in the three…

Q: Draw the connections for three phase transformer configuration listed below using single phase…

A: The three-phase transformer configure using three single-phase transformers as below, (a) Star/star…

Q: single-phase transformer has a voltage regulation of 10% when delivering full load at unity power…

Q: Short circuit test on a single phase transformer is performed to determine_____________ a.…

A: Need to Find the correct option

Q: When conducting no-load test on a given single-phase transformer, the following test data were…

A: As per the guidelines, we supposed to answer first three part of the question at a time so please…

Q: Detailed description of open circuit test on single phase transformer

A: In this question we discuss about open circuit test of transformer .

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

A: In this question , we will convert single phase transformer into step down auto transformer..

Q: Draw the phasor diagram for no-load practical transformer and mention all parameters in the phasor…

A: Given Draw no load transformers with all the parameter.

Q: a) Discuss why a starldelta or delta/star configuration of a three-phase transformer is optimal for…

Q: The short current in the short circuit test for the single phase transformer is----- *

Q: Determine the load sharing in MVA for each transformer. Draw the parallel transformer diagram for…

Q: Two generators are connected in parallel to the low voltage side of a transformer. Generators Gl and…

A: converting old sub-transient of generator at new base value Xpu new =Xpu old MVAnewMVAold…

Q: 3.6 For a conceptual single-phase phase-shifting transformer, the primary voltage leads the…

Q: Consider a single phase transformer of rating 150 KVA, 1500/150, 50 Hz. Let the series resistance…

A: Given: Z1=R1+jX1=0.2+j0.45 ΩZ2=R2+jX2=0.002+j0.0045 ΩKVA=150

Q: Three single-phase two-winding transformers, each rated 25 MVA, 54.2/5.42 kV, are connected to form…

A: The explanation is as follows.

Q: In no load phasor diagram of practical transformer, the magnetizing current Imag is…

A: Magnetizing current is the total current that flows into the primary of a transformer when the…

Q: A 50 MVA 230/115-kV, A-Y three-phase connected power transformer has a per unit resistance of 0.015…

A: Given rating of transformer : 50 MVA HV side 230 V assuming primary side LV side 115 V assuming…

Q: Q1: What is the influence of transformer connections in single-phase transformers connected for 3-…

A: According to the Bartleby guidelines “Since you have asked multiple question, we will solve the…

Q: Transformer are rated in kilovoltamperes so the sizing of same is independente of the load power…

A: (1) Transformer are rated in kilovolt amperes so the sizing of same is independent of the load power…

Q: Three Phase Transformer connections: Discuss Fully the various methods available for transforming…

A: The methods of transformation of a 3-phase voltage into higher or lower 3-phase voltages is done…

Q: What are the objectives of implementing an open circuit test on single phase transformer

A: In this question we will write objective of open circuit test on single phase transformers...

Q: If the core loss of single phase transformer at full load is 124 W, then the core loss at 50% of…

A: Given Data: Core loss = 124 V percentage loading x = 50%

Q: In a transformer test, data from short circuit and open circuit tests of a 75-kVA, 4600-230V, 60Hz…

A: a) Using the given data cosϕo=POCVOCIOC=521230×13.04=0.174 Magnetizing reactance,…

Q: / Short circuit test on a single phase transformer is performed to determine_____________ a.…

A: Given that Short circuit test on a single phase transformer is performed to determine_____________

Q: if the core loss of 1 phase transformer at full load is 42 W, then the core loss at 25% of load is…

A: Given, 1-ph transformer has Full load core loss(Pc)= 42 watts

Q: The shell type transformer has less leakage flux compared to core type transformer O True False

A: In this question ,we have to write that shell type transformer has less leakage flux or not compared…

Q: What conclusions we come up with after doing open circuit test on single phase transformer

A: For open circuit test of transformer excite any one winding of transformer at rated voltage and…

Q: A 400-MVA, 240-kV/24-KV, three-phase Y-A transformer has an equivalent series impedance of 1.2 + j6…

A: According to the question we have to find the line-to-line voltage at high terminals of the…

Q: Triplen harmonics and their effect on the transformer winding if the transformer is having Y-Δ and…

A: Here discussion is about, Triplen harmonics and their effect on the transformer winding if the…

Q: A 50-kVA 13.8-kV/208-V (rms, line-line) ∆−Ythree-phase distribution transformer has a per-unit…

A: Dear student as per our guidelines we are supposed to solve only one question in which it should…

Q: (b) In a transformer test, data from short circuit and open circuit tests of a 75-kVA, 4600-230V,…

Q: What are the problems associated with Y-Y three phase transformer connection?

Q: state the advantages and disadvantages of three phase transformer connections

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

Q: A 400-MVA, 240-kV/24-KV, three-phase Y-A transformer has an equivalent series impedance of 1.2 + j6…

A: Delta-Star transformer- A Delta-Star transformer is a transformer whose primary side is in delta…

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

The line-to-ground voltages on the high voltage side of a step-up transformer are 100 KVZ0° , 33 kVZ-100° and 38 kVZ176.5° on phases a, b and c respectively. Determine the symmetrical components of voltage of phase a and phase b. Draw the negative
sequence phasor diagram.

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 2 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

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.
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) -
In order to avoid difficulties with third-harmonic exciting current, which three-phase transformer connection is seldom used for step-up transformers between a generator and a transmission line in power systems. (a) Y- (b) -Y (c) Y-Y
A single-phase step-down transformer is rated 13MVA,66kV/11.5kV. With the 11.5 kV winding short-circuited, rated current flows when the voltage applied to the primary is 5.5 kV. The power input is read as 100 kW. Determine Req1andXeq1 in ohms referred to the high-voltage winding.
A single-phase 50-kVA,2400/240-volt,60-Hz distribution transformer has a 1-ohm equivalent leakage reactance and a 5000-ohm magnetizing reactance referred to the high-voltage side. If rated voltage is applied to the high-voltage winding, calculate the open-circuit secondary voltage. Neglect I2RandGc2V losses. Assume equal series leakage reactances for the primary and the referred secondary.
The ratings of a three-phase, three-winding transformer are Primary: Y connected, 66kV,15MVA Secondary: Y connected, 13.2kV,10MVA Tertiary: connected, 2.3kV,5MVA Neglecting resistances and exciting current, the leakage reactances are: XPS=0.09 per unit on a 15-MVA,66-kV base XPT=0.08 per unit on a 15-MVA,66-kV base XST=0.05 per unit on a 10-MVA,13.2-kV base Determine the per-unit reactances of the per-phase equivalent circuit using a base of 15 MVA and 66 kV for the primary.
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.
A single-phase 50-kVA,2400/240-volt,60-Hz distribution transformer is used as a step-down transformer at the load end of a 2400-volt feeder whose series impedance is (1.0+j2.0) ohm. The equivalent series impedance of the transformer is (1.0+j2.5) ohms referred to the high-voltage (primary) side. The transformer is delivering rated load at a 0.8 power factor lagging and at a rated secondary voltage. Neglecting the transformer exciting current, determine (a) the voltage at the transformer primary terminals, (b) the voltage at the sending end of the feeder, and (c) the real and reactive power delivered to the sending end of the feeder.
A single-phase l0-kVA,2300/230-volt,60-Hz two-winding distribution transformer is connected as an autotransformer to step up the voltage from 2300 to 2530 volts (a) Draw a schematic diagram of this arrangement, showing all voltages and currents when delivering full load at rated voltage. (b) Find the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the rated values as a two-winding transformer. How much of this kVA rating is transformed by magnetic induction? (C) The following data are obtained from tests carried out on the transformer when it is connected as a two-winding transformer: Open-circuit test with the low-voltage terminals excited: Applied voltage =230V, input current =0.45A, input power =70W. Short-circuit test with the high-voltage terminals excited: Applied voltage =120, input current =4.5A, input power =240W. Based on the data, compute the efficiency of the autotransformer corresponding to full load, rated voltage, and 0.8 power factor lagging. Comment on why the efficiency is higher as an autotransformer than as a two-winding transformer.
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) -.
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.
The ideal transformer windings are eliminated from the per-unit equivalent circuit of a transformer. (a) True (b) False