AN310
Group A
Review of basic concepts in electrostatics and magnetostatics, Basic laws due to Ohm, Coulomb, Faraday, Ampere and Kirchhoff, Network parameters and theorems, Superposition theorem, Thevenin and Norton’s Theorems, Network analysis, Steady state response of circuits to sinusoidal functions. Power and power factor. Phasor representation of sinusoidal complex impedances. Resonance. Magnetic field calculations. Magnetization curves. Magnetic circuits concepts and calculation. Hysteresis and eddy current losses. Relays.
Polyphase circuits-Three-phase supply systems. Phase sequence. Balanced three-phase circuits. Star and delta connected loads. Unbalanced three-phase circuits. Symmetrical components. Power measurement in three-phase circuits. Active and reactive power. Power factor improvement.
Group B
Elements of power distribution. d.c.2-wire, 3 wire distributions. a.c. 3-wire and 4-wire distributions. Radial and ring main distributions. Current loading and voltage profile in distributions. Comparison of copper efficiencies in different systems of distribution.
Power transformers, theory of operation, phasor diagram, equivalent circuit. Efficiency and regulation.
Principles of energy conversion; Basic concepts of rotating machines, torque and emf; d.c. machines, characteristics of series, shunt and compound motors and generators.
Basic principles of operation of synchronous and induction machines. Starting of induction motors. Regulation of synchronous generator by synchronous impedance method. Single-phase induction and commutator machines.
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