Answer all subparts Q3.(a) A power generating plant consists of two multiple-valve generating units whosefuel cost functions (F1 and F2) expressed in £/hour are given as:F = 0.035P? + 22P, + 10F2 = 0.045P + 14P2 + 5where P, and P, are the output powers in MW of the two units, respectively. Thetwo generating units are running with minimum and maximum possible loadingfor each one of 50MW and 250 MW. The total load is 160MW.(i)For minimum fuel costs, calculate the load sharing between the units, andthe incremental fuel cost of the plant.(ii)Calculate the total hourly cost of this despatch.(b) A 3-phase star-connected, balanced load is fed from an 11kV 50HZ supply. Theload impedance per phase consists of a 200 resistor in series with a 60mHinductor. How many percentage will the frequency change if the power load isreduced by 2%? What is the frequency in this case?(c) Explain the principle of the 3-zone directional distance protection. What type ofdistance replay can be used for 3-zone directional distance protection?

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Q3. (a) A power generating plant consists of two multiple-valve generating units whose fuel cost functions (F1 and F2) expressed in £/hour are given as: F, = 0.035P? + 22P, + 10 F2 = 0.045P? + 14P2 + 5 where P, and P, are the output powers in MW of the two units, respectively. The two generating units are running with minimum and maximum possible loading for each one of 50MW and 250 MW. The total load is 160MW.

Q3. (a) A power generating plant consists of two multiple-valve generating units whose fuel cost functions (F1 and F2) expressed in £/hour are given as: F, = 0.035P? + 22P, + 10 F2 = 0.045P? + 14P2 + 5 where P, and P, are the output powers in MW of the two units, respectively. The two generating units are running with minimum and maximum possible loading for each one of 50MW and 250 MW. The total load is 160MW.

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...

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Concept explainers

Code Conversion

The method or technique used to convert code from one format to another is termed code conversion. Code conversions are most commonly used in computers, digital electronics, microprocessors, etc.

Question

Answer all subparts

Q3.
(a) A power generating plant consists of two multiple-valve generating units whose
fuel cost functions (F1 and F2) expressed in £/hour are given as:
F = 0.035P? + 22P, + 10
F2 = 0.045P + 14P2 + 5
where P, and P, are the output powers in MW of the two units, respectively. The
two generating units are running with minimum and maximum possible loading
for each one of 50MW and 250 MW. The total load is 160MW.
(i)
For minimum fuel costs, calculate the load sharing between the units, and
the incremental fuel cost of the plant.
(ii)
Calculate the total hourly cost of this despatch.
(b) A 3-phase star-connected, balanced load is fed from an 11kV 50HZ supply. The
load impedance per phase consists of a 200 resistor in series with a 60mH
inductor. How many percentage will the frequency change if the power load is
reduced by 2%? What is the frequency in this case?
(c) Explain the principle of the 3-zone directional distance protection. What type of
distance replay can be used for 3-zone directional distance protection?

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