1. SUPPLY SYSTEM
Introduction to Transmission and Distribution systems, Comparison between DC and AC systems for
Transmission and Distribution, comparison of cost of conductors, choice of working voltage for transmission & distribution, economic size of conductors - Kelvin's law, Radial & mesh distribution networks, Voltage
regulation.
2. GENERAL
Conductor materials; solid, stranded, ACSR, hollow and bundle conductors. Different types of supporting
structures for overhead lines. Elementary ideas about transmission line construction and erection. Stringing of
conductors, spacing, sag and clearance from ground, overhead line insulators, concept of string efficiency.
3. TRANSMISSION LINE PARAMETERS
Introduction to line parameters, Resistance of transmission line, inductance of single phase two wire line,
concept of G.M.D., Inductance of three phase line, Use of bundled conductor, transposition of power lines,
capacitance of 1-phase and 3-phase lines. effect of earth on capacitance of conductors.
4. PERFORMANCE OF TRANSMISSION LINES
Representation of short transmission line, medium length line (nominal T & II circuits). long length line by
hyperbolic equations and equivalent T & II circuits. Power flow through transmission lines, ABCD constants,
Voltage regulation.
5. CIRCLE DIAGRAM AND LINE COMPENSATION
Receiving end circle diagram for long transmission lines based on ABCD constants, equivalent T circuits ,
power loci, surge impedance loading, reactive power requirement of system series and shunt compensation,
Synchronous phase modifiers , rating of phase modifiers.
6. UNDERGROUND CABLES
Classification of cables based upon voltage and dielectric material, insulation resistance and capacitance of
single core cable, dielectric stress, Capacitance of 3 core cables, methods of laying, heating effect, Maximum
current carrying capacity, cause of failure, comparison with overhead transmission lines.