13 - Curriculum Development Centre, Kalamassery

UNIT - V5.1.0 Understand the Concept of Distribution Systems5.1.1. Describe the functions of insulators5.1.2. Classify the different types of insulator – pin, disc and strain5.1.3. Compare the various types of insulators and list out the advantages5.1.4. Define the expression for string efficiency (upto 3 disc)5.1.5. Derive string efficiency5.1.6. Solve simple problem on string efficiency5.1.7. State the necessity of guarding rings and arcing horns5.1.8. Describe the necessity of insulator testing5.1.9. Explain the flash over, performance and routine test as per I.S code5.1.10. Compare DC two wire system with DC three wire systems5.1.11. Compare DC two wire system with AC single phase and three phase systems5.1.12. Define feeders, distributors and service mains5.1.13. Study of Radial, ring an inter connected systems5.1.14. Study DC distribution calculations5.1.15. Study AC distribution calculationsCONTENT DETAILSUNIT - IElectrical Power GenerationIntroductionSources of energy – Conventional– layout and working of Hydro – electric power stations - thermalpower station - Nuclear power station - gas based power station and diesel power stationsEstimations of available energy from Hydro electric power stations -Choice of site for power stations - Comparison of cost of different power stationsUNIT - IIEconomics of Powercost of generation– fixed and running cost – interest –depreciation - total annual costMaximum demand - average demand and load factor (daily and annual) - diversity factor of generation -effect of load factor and diversity factor on cost of generation – total generating cost per kWh-problemsTariff - types of tariff - problemsPower Factor improvement – necessity of determination of KVAR - rating of capacitors for the powerfactor improvement for 1 and 3 phase loads – ProblemsUNIT - IIITransmission Line elementsTransmission of electrical energy – different systems of transmission and circuit - conductor size in ACsystems - Choice of voltage - Principles and advantages of DC transmission system -Transmission lineconstants - Inductance and capacitance of round and parallel conductors 1) single phase 2) three phasewith symmetrically spaced conductorsTransposition of conductors and its necessity - inductances - capacitance of transposed lines (formulaonly) – Problems - Performance of transmission lines – definition of short, medium and long lines -lumped and distributed parameters – Equivalent circuit and vector diagram of short transmission lines fordifferent power factor - conditions at receiving end – calculations of sending end voltage and powerfactor - Regulation and transmission efficiency from receiving end conditions- Problems - Skin effect inACSR conductors – corona in transmission lines – Ferranti effect .97