# Electrical Power System – II - [2160908]

#### Teaching Scheme

 Theory Tutorial Practical Total 3 0 2 5

#### Examination Scheme

 Theory Examination Practical Examination Total ESE (E) PA (M) ESE Viva (V) PA (I) 70 30 30 20 150

ESE = End Semester Examination, PA = Progressive Assessment

#### Current and Voltage Relations on a Transmission Line

Representation of line, The short transmission line, The medium-length line, The long transmission line: Solution of the differential equations, The long transmission line: Interpretation of the equations, The long transmission line: Hyperbolic form of the differential equations, The equivalent circuit of a long line, Power flow through atransmission line (circle diagrams), Reactive compensation of transmission lines.

#### Symmetrical Three-Phase Faults:

Transients in RL Series circuits, Short-Circuit currents and the reactances of Synchronous machines, Internal voltages of loaded machines under transient conditions, The bus impedance matrix in fault calculations, A bus impedance matrix equivalent network, The selection of circuit breakers

#### Symmetrical Components:

Synthesis of Unsymmetrical phasors from their symmetrical components, The symmetrical components of unsymmetrical phasors, Phase shift of symmetrical components in StarDelta Transformer Banks [2], Power in terms of symmetrical components, Sequence circuits of Y and ? impedances, Sequence circuits of a symmetrical transmission line, Sequence circuits of the synchronous machine, Sequence circuits of a Y- ? transformer, Unsymmetrical series impedances, Sequence networks

#### Unsymmetrical Faults:

Single line to ground fault on an unloaded generator, Line to Line fault on an unloaded generator, Double Line to Ground fault on an unloaded generator, Unsymmetrical faults on power systems, Single line to Ground fault on a power system, Line to Line fault on a power system, Double Line to Ground fault on a power system, Interpretation of the interconnected sequence networks, Analysis of unsymmetrical faults using the bus impedance matrix, Faults through impedance, Computer calculations of fault currents

#### Transients in Power Systems:

Transients in Simple Circuits, 3-phase Sudden Short Circuit of an Alternator, The Restriking Voltage after Removal of Short Circuit, Travelling Waves on Transmission Lines, Attenuation of Travelling Waves, Capacitance Switching, Overvoltage due to Arcing Ground

#### Corona:

Critical Disruptive Voltage, Corona Loss, Line Design based on Corona, Disadvantages of Corona, Radio Interference, Inductive interference between Power and Communicationlines.