(a) A 110 MVA, 55 kV three phase generator has a subtransient reactance of 8%. The generator supplies one motor over a transmission line having transformers at both ends as shown in Fig. The motor have rated input of 100 MVA 20 kV with 7% subtransient reactance. The rating of the sending end transformer, T, is 80 MVA, 200 kV/ 35 kV (A-Y) with leakage reactance of 15%. Transformer T2 at the receiving end has 75 MVA, 200 kV /20 kV (Y-A). The leakage reactance of T2 is 10%. The line length is 13 km and the series reactance of the line is 14 ohms/km. Draw the reactance diagram with all reactance marked in p.u. Choose 130 MVA and 40 kV as the base values. T2 Motor Generator T1 YS Δ

(a) A 110 MVA, 55 kV three phase generator has a subtransient reactance of 8%. The generator supplies one motor over a transmission line having transformers at both ends as shown in Fig. The motor have rated input of 100 MVA 20 kV with 7% subtransient reactance. The rating of the sending end transformer, T, is 80 MVA, 200 kV/ 35 kV (A-Y) with leakage reactance of 15%. Transformer T2 at the receiving end has 75 MVA, 200 kV /20 kV (Y-A). The leakage reactance of T2 is 10%. The line length is 13 km and the series reactance of the line is 14 ohms/km. Draw the reactance diagram with all reactance marked in p.u. Choose 130 MVA and 40 kV as the base values. T2 Motor Generator T1 YS Δ

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Related questions

Q: Please solve this question step by step

A: The objective of the question is to draw the three-phase and equivalent single-phase circuits for a…

Q: Iron and copper losses in a 20 KVA, 2000/200 volt 1-phase transformer are 400 W and 500 W watts…

Q: A 1-phase transformer, 15 kVA, 660/250V, 50HZ, Reg1= 2.78790 and Xegi = 5.57572. %3D the secondary…

A: According to the question, we have to calculate the value of regulation up at full load and power…

Q: When the two-phase load at the secondary has a 0.9 p.f, the main transformer operates at 77.9% p.f…

A: In some industries , 2-phase supply system is required for operating certain loads such as Electric…

Q: A 50 kVa single phase transformer has an initial cost of P120,000 and a salvage value of P35,000…

A: Here, we have given a 50 kVA single phase transformer: having the initial cost of P120,000. the…

Q: A 450 kVA, single-phase transformer has a primary winding resistance of 0.6 2 and a secondary…

A: It is given that: KVA=450 kvaR1=0.6 ΩR2=0.004 ΩPi=2600 WV1=2.8 kVV2=500 Vcosϕ=0.82 lagging

Q: A 600 kVA transformer has a primary winding resistance of 0.62 and a secondary winding resistance of…

A: We need to find a efficiency of transformer at full load with power factor 0.8 and on half loaded…

Q: A 1000-VA 380 / 110 V conventional transformer is to be used to supply power from a 490-V source to…

A: From the given data of normal transformer, KVA=1000 VAVP=380 VVS=110 V To the Auto-transformer…

Q: Three Phase Power Factor Improvement Suppose that a shop is served with a three-phase, 400 V…

A: Given: Before power factor correction: After correction:

Q: Using the parameters from the Typical Transformer Values Sheet for a 12.4kV/600V, 100 kVA…

Q: Day loading duty-cycle profile of a 100 kVA, 2400/240 V, 50 Hz transformer is given below. The SC…

Q: 7- A 5KVA, 220/110V, 50HZ 1-phase transformer has Reg1 and Xeg1 of 0.9680 and 1.9630 respectively.…

Q: Q2. Consider the single-phase transformer circuit shown below. Transformer ratings and reactances…

A: Since you have asked multiple questions in a single request, we will be answering only the 1st…

Q: A 30 KVA, 24000/220 V, Y A connected transformer bank is operated at full load with an efficiency of…

A: Given S =30 KVA V1 =24000∠0° VV2 =220∠-5.77° V Efficiency η =96% Voltage regulation =11% Primary…

Q: A 35 MVA, 12 kV, three phase Generator has sub transient reactance of 14 %. The generator is…

A: In this question we need to find transmission line reactance in per unit value.

Q: An alternating voltage is given by v1 = 95 sin( 200 Tit -0.3 ) volts. What is the phase angle…

A: Given: V1=95 sin200 πt-0.3Volts V2=95 sin200πt

Q: Three single phase transformers, each rated at 12kVA, 120/240V, 60Hz, are connected to form a…

A: Given data : Each rating of transformer =12 KVA Power factor =0.8 lagging

Q: a) Draw a reactance diagram for the circuit. b)Determine the voltage at the primary side of the…

Q: A single - phase transformer rated 60 KVA in connected to 400/235 VA 5HZ supply, has an efficiency…

A: Given Data: No load voltage = 235 V Full load voltage = 200 V

Q: 200 KVA, single phase two-winding transformer rated 4160/230 V, 60 Hz has primary and second…

Q: SKVA, 50Hz, single phase transioer, the primary voltage of the transformer is 110v. Roy and X is…

A: Given data, Voltage Vp=110V Resistance Req=0.26Ω Reactance=j0.4Ω V.R.=15% Power factor P.F.=0.707…

Q: Determine the efficiency of three-phase 400 kVA, 11kV/ 380 V transformer at over-loading condition…

Q: Answer by true or false True False The efficiency of a transformer at load 0.8 p.f. Lag is less than…

A: The efficiency of a transformer at load 0.8 pf lag is slightly more than at load 0.8 pf lead. As…

Q: The 240 kV transmission line is intended to be connected to a 220 kV transmission system through an…

A: The above question is related to a single-phase autotransformer.Given that a 240 kV transmission…

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) A 110 MVA, 55 kV three phase generator has a subtransient reactance of 8%. The generator supplies one motor over a
transmission line having transformers at both ends as shown in Fig. The motor have rated input of 100 MVA 20 kV with 7%
subtransient reactance. The rating of the sending end transformer, T, is 80 MVA, 200 kV/ 35 kV (A- Y) with leakage reactance of
15%. Transformer T2 at the receiving end has 75 MVA, 200 kV /20 kV (Y-A ). The leakage reactance of T2 is 10%. The line length is
13 km and the series reactance of the line is 14 ohms/km. Draw the reactance diagram with all reactance marked in p.u. Choose
130 MVA and 40 kV as the base values.
T2
Motor
Generator
T1
YS
Δ

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 three-phase Y-Y transformer has specifications of 25 MVA, 15/200 kV and an equivalent series impedance of 200+j670 Ω, referred to the high side. If rated voltage is applied to the high voltage winding, while a three-phase load is connected to the low side, the rated input power of the transformer is 23 MW with a factor ofpower of 0.86 delayed. Under these conditions, the terminal line voltage at the load relative to the low voltage terminal is : a) 11,95 kVb) 13,78 kVc) 10,93 kVd) 15,80 kVe) 12,65 kV
For a 50 kVa distribution transformer, which on its high voltage side is 2400 V and on the short-circuit low voltage secondary has a voltage of 240 V with a frequency of 60 Hz, it has a leakage impedance of 0.72+j0.92 Ω on the high voltage side and 0.0070+j0.0090 Ω on the high voltage side low tension. The short-circuit test presented values of 48 V, 20.8 A and 617 W for high voltage. The impedance responsible for the excitation current is 6.32+j43.7 Ω referring to the low voltage side. One open circuit test, with the low voltage side energized, presented the values of 240 V, 5.14 A and 186W. According to the information presented, determine: a. Draw the equivalent circuit on the high voltage side and present the impedance values in the circuit. b.Draw the equivalent circuit on the low voltage side and present the impedance values in the circuit. c. For the high voltage value, calculate the value of the current flowing in the magnetizing impedance. d.Determine the yield for an…
Q1. The following figure shows the differential protection of power transformers with specifications of 20 MVA, 66/11 KV.Trans is No load.If a two-phase short circuit occurs between phases b and ¢ It is desirable to calculate the currents passing through the CTs and relays R, Y, B. If these relays are three overcurrent relays with inverse characteristics as T=0.63 / log (I / Iset) and Iset =0.5A.Will this work for short circuit relays? If yes, which relay works faster and at what time?
A 100 kVA, 7,200/480V., 60Hz single-phase transformer has the primary and secondary resistances of 1.96 Ω and 0.008 Ω, and primary and secondary reactances of 4.55 Ω and 0.0151 Ω respectively. Find the primary voltage requiredto produce 480V. at the secondary terminals at full load when the power factor is 0.93 lagging.
Q.4 A 3-phase transmission line operating at 10 KV and having a resistance of 1 Q and reactance of 4 0 is connected to the generating station bus-bars through 5 MVA step-up transformer having a reactance of 5%. The bus bars are supplied by a 10 MVA alternator having 10% reactance. Calculate the short-circuit KVA fed to symmetrical fault between phases if it occurs (i) at the load end of transmission line. (ii) at the high voltage terminals of the transformer.
QUESTIUNDH 1. Why is it not adjustable to carry or the same experiment for large transformers? 2. What method you have to apply to determine the efficiency of large transformer? 3. Draw the vector diagram for unity, leading p.f and lagging p.f at rated secondary current?
Q3: At the parallel operation of three-phase transformers: a) Give an explanation for the following cases: i. Two-lamps are glow-up ii. Three-lamps are glow-up b) Two three-phase 11kV/ 380 V transformers are connected in parallel to serve a load of 36 kVA at unity power factor. The secondary side current for one transformer is 14.1 A, determine the load sharing for each transformer and the current of the other transformer.
3. Determine the average value of the square wave as shown below. v(1) 20 V -20 V