Transmission and Distribution

EE3401

TRANSMISSION AND DISTRIBUTION

COURSE OBJECTIVES:

• To impart knowledge about the configuration of the electrical power systems.

• To study the line parameters and interference with neighboring circuits.

• To understand the mechanical design and performance analysis of transmission lines.

• To learn about different insulators and underground cables.

• To understand and analyze the distribution system.

UNIT I

TRANSMISSION LINE PARAMETERS

Structure of electric power system - Parameters of single and three phase transmission lines with single and double circuits -Resistance, inductance, and capacitance of solid, stranded, and bundled conductors Typical configuration, conductor types Symmetrical and unsymmetrical spacing and transposition - application of self and mutual GMD; skin and proximity effects - Effects of earth on the capacitance of the transmission line - interference with neighboring communication circuits.

UNIT II

MODELLING AND PERFORMANCE OF TRANSMISSION LINES

Performance of Transmission lines - short line, medium line and long line - equivalent circuits, phasor diagram, attenuation constant, phase constant, surge impedance - transmission efficiency and voltage regulation, real and reactive power flow in lines - Power Circle diagrams - Ferranti effect - Formation of Corona Critical Voltages - Effect on line Performance.

UNIT III

SAG CALCULATION AND LINE SUPPORTS

Mechanical design of overhead lines - Line Supports -Types of towers - Tension and Sag Calculation for different weather conditions - Methods of grounding Insulators: Types, voltage distribution in insulator string, improvement of string efficiency, testing of insulators.

UNIT IV

NDERGROUND CABLES

Underground cables Types of cables - Construction of single-core and 3-core belted cables - Insulation Resistance - Potential Gradient - Capacitance of single-core and 3-core belted cables Grading of cables - Power factor and heating of cables- DC cables.

UNIT V

DISTRIBUTION SYSTEMS

Distribution Systems - General Aspects - Kelvin's Law - AC and DC distributions -Concentrated and Distributed loading- Techniques of Voltage Control and Power factor improvement - Distribution Loss - Types of Substations - Trends in Transmission and Distribution: EHVAC, HVDC and FACTS (Qualitative treatment only).

TOTAL: 45 PERIODS

TEXT BOOKS:

1. D.P.Kothari, I.J. Nagarath, 'Power System Engineering', Mc Graw-Hill Publishing Company limited, New Delhi, Third Edition, 2019.

2. C.L.Wadhwa, 'Electrical Power Systems', New Age International Ltd, seventh edition 2022.

3. S.N. Singh, 'Electric Power Generation, Transmission and Distribution', Prentice Hall of India Pvt. Ltd, New Delhi, Second Edition, 2008.

REFERENCE BOOKS:

1. B.R.Gupta, 'Power System Analysis and Design' S. Chand, New Delhi, Sixth Edition, 2011.

2. Luces M.Fualken berry, Walter Coffer, 'Electrical Power Distribution and Transmission', Pearson Education, 2007.

3. Arun Ingole, "Power transmission and distribution" Pearson Education, first edition, 2018

4. J.Brian Hardy and Colin R.Bayliss 'Transmission and Distribution in Electrical Engineering', Newnes; Fourth Edition, 2011.

5. G.Ramamurthy, "Handbook of Electrical power Distribution," Universities Press, 2013.

6. V.K.Mehta, Rohit Mehta, 'Principles of power system', S. Chand & Company Ltd, New Delhi, 2013

7. Hadi Saadat, 'Power System Analysis', McGraw Hill Education Pvt. Ltd., New Delhi, 3rd Edition, 23rd reprint, 2015.

8. R.K.Rajput, 'A Text Book of Power System Engineering' 2nd edition, Laxmi Publications (P) Ltd, New Delhi, 2016.

COURSE OUTCOMES

On the successful completion of the course, students will be able to:

CO1: Understand the structure of power system, computation of transmission line parameters for different configurations.

CO2: Model the transmission lines to determine the line performance and to understand the impact of Ferranti effect and corona on line performance.

CO3: Do Mechanical design of transmission lines, grounding and to understand about the insulators in transmission system.

CO4: Design the underground cables and understand the performance analysis of underground cable.

CO5: Understand the modelling, performance analysis and modern trends in distribution system.