Syllabus Transmission and Distribution - (EE3401) 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. (Chapter - 1) 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. (Chapters - 2, 3) 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. (Chapters - 4, 5) UNIT IV UNDERGROUND 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. (Chapter - 6) 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). (Chapters - 7, 8)
