Transmission And Distribution

Transmission And Distribution

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Structure of electric power system: Various levels such as generation, Transmission and Distribution; HVDC and EHV AC transmission: Comparison of economics of transmission, Technical performance and Reliability, Application of HVDC transmission system. FACTS (qualitative treatment only): TCSC, SVC, STATCOM, UPFC.Transmission Line ParametersParameters of Single and Three phase transmission lines with Single and Double circuits: Resistance, Inductance and Capacitance of solid, Stranded and Bundled conductors: Symmetrical and Unsymmetrical spacing and Transposition: application of Self and Mutual GMD; Skin and Proximity effects; Interference with neighbouring communication circuits. Typical configuration, Conductor types and Electrical parameters of 400, 220, 110, 66 and 33 kV lines. Modelling and Performance of Transmission LinesClassification of lines: Short line, Medium line and Long line; Equivalent circuits, Attenuation constant, Phase constant, Surge impedance; Transmission efficiency and Voltage regulation; Real and Reactive power flow in lines: Power-angle diagram : Surge-impedance Loading, loadability limits based on thermal loading. Angle and Voltage stability considerations; Shunt and Series compensation; Ferranti effect and Corona loss.Insulators and CablesInsulators: Types, voltage distribution in insulator string and grading, Improvement of string efficiency. Underground cables: Constructional features of LT and HT cables, Capacitance, Dielectric stress and Grading, Thermal characteristics.Substation, Grounding System and Distribution SystemTypes of substations; Bus-bar arrangements; Substation bus schemes: Single bus scheme, Double bus with Double breaker, Double bus with Single breaker, Main and Transfer Bus, Ring Bus, Breaker-and-a-Half with Two main buses, Double bus-bar with Bypass isolators.Resistance of grounding systems: Resistance of driven rods, Resistance of grounding point electrode, Grounding grids; Design principles of substation grounding system; Neutral grounding.Radial and Ring-main distributors; Interconnectors; AC distribution: AC distributor with Concentrated load; Three-phase four-wire distribution system; Sub-mains; Stepped and Tapered mains.This ensures the continuity during maintenance and also can be used to satisfy future demand. The power is then transmitted to the receiving station via step down transformer. This transformer is 220/33 kV or 220/22 kV transformer. The poweranbsp;...

Title:Transmission And Distribution
Author:M.V.Bakshi U.A.Bakshi
Publisher:Technical Publications - 2008-01-01


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