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5EE5
TRANSMISSION & DISTRIBUTION
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SUPPLY SYSTEMS:
Basic network of power systems, Effect of system voltage on
size of conductor and losses, comparison of de 2-wire, de-3 wire, 1-phase ac
and 3-phase (3 wire and 4 wire) ac systems, transmission voltages.
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DISTRIBUTION AUTOMATION: Types of primary & secondary distribution
system, voltage drop, Kelvin's law, Lamp flicker, Distribution
automation, project planning, communication, sensors, supervisory control and
data acquisition consumer information service, introduction to automation
systems.
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INSULATORS: Pin shackle, suspension, post and strain insulators, bushing,
voltage distribution over an insulator string, grading and methods of
improving string efficiency, pollution flashower.
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MECHANICAL FEATURES OF OVERHEAD LINES: Different types of conductor
materials with special reference to their mechanical properties. Line support,
cross-arms and stays,spacing and arrangement of conductors. Conductors'
vibration and its prevention sag tension calculation for various conditions.
Sag templates. conductor erection and stringing.
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PARAMETERS OF TRANSMISSION LINES: Resistance inductance and capacitance of
overhead lines. Effect of earth. Line transposition. geometric mean radius and
distance. Inductance and capacitance of line with symmetrical an unsymmetrical
spacing. Inductance and capacitance of double circuit lines. Skin and
proximity effects.
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PERFORMANCE OF TRANSMISSION LINES: Steady state analysis short, medium and
long lines. Generalized ABCD line constant. Receiving end & sending end
power circle diagrams. Ferranti effect. Interference with communication
circuits.
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CORONA:
Electric stress between parallel conductors. Disruptive critical
voltage and visul critical voltage. Calculation for 3-phase overhead line
corona power loss. Factors affecting corona. Effect of corona.
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UNDERGROUND CABLES: Conductor, insulating, sheathing and armouring
maaterials. Types of cables. Insulation resistance and capacitance
calculation. Reduction of maximum stresses. Causes of break down, idea about oil
filled and gas filled cables,Thermal rating of cable.
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TRAVELLING WAVES: Travelling waves on transmission lines. Wave equation,
specification of travelling waves. Reflection and refraction of travelling
waves. Typical cases of line terminations.
RECOMMENDED
BOOKS.
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A.S. Pabla:Electric power distribution.
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B.R. gupta:Power system analysis and design
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Soni, Gupta and Bhatnagar:A course in electrical power.
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C.L. Wadhwa:Electrical power systems
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Nagrath kothan:Modern power system analysis
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J.J. Grainger & W.D. Stevenson:Power system
analysis
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