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POWER SYSTEMS

POWER SYSTEMS

Group A
Generation of electrical power: Conventional and non-conventional methods. Typical
layout of thermal and hydro power stations-main and auxiliary equipment.
Load management: Base and peak loads. Load curves Definitions of load factor, diversity
factor, demand factor. Capacity planning. Load forecasting. Capital and running costs for
different types of plants. Different electricity tariffs-flat rate, two part and TOD tariff.
Generator excitation systems: Speed and excitation control of generators. Load sharing of
generators in a system.
Stability of power system: Definitions of transient and steady state stability. Swing equation
and its solution by step-by-step method. Equal area criterion for transient stability.

Group B
Transmission of electrical power: Overhead and underground transmission line
configurations. Materials for transmission line conductors and insulators. Power station and
sub-station switchyard and layouts. ACSR conductors, bundled conductors. Overhead line
poles, towers and cross arms.' Single and double circuit lines.
Untransposed and transposed 3-phase transmission lines. Overhead, line sag calculation.
Effect of wind pressure and ice loading on transmission lines.
Transmission line parameters: Resistance, inductance and capacitance calculations. Skin
and proximity effects. Corona and radio interference of EHV lines. Voltage distribution in
suspension insulators. String efficiency. Different types of cables. Capacitance of cables.
Intersheath grading.
Performance of short transmission lines: Line loss, efficiency and regulation of line. Zero
regulation condition of power transmission.
Performance of medium transmission lines: Nominal T and ^ representation. Regulation
and efficiency of medium lines.
Performance of long transmission lines: Equivalent T and ^ representations. Propagation
constant and characteristic impedance of a long line. Ferranti effect. urge impedance loading.
Infinite line. Wavelength of line. Determination of A, B, C, D constants of transmission lines.
Transmission line charts: Power factor and power angle of a transmission line. Power angle
diagram of an interconnector. Use of shunt and series capacitor in a transmission line.
SYLLABUSELECTRICAL ENGINEERING
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AMIE(I) STUDY CIRCLE(REGD.)

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