Introduction: Scope and importance of Electrical Engineering in Mining, qualification, roles and responsibilities of electrical inspectors, Indian Electricity Rules applicable to Mining.
Introduction to Electrical Drives and its Application in Mining: Electrical Drives, advantages, parts, choice of electrical drives, status of AC and DC drives, precautions in coal mines, methods of neutral grounding, types of electric drives for control of winders, shearers and conveyors, electric drives for mine hoists.
DC Machines: Types and characteristics of DC motors, voltage and torque equation of DC motors, regulation, and speed control of shunt motors – armature, flux and voltage control, problems on shunt motors. Electric braking of shunt motors – dynamic, plugging and regenerative, characteristics of DC shunt generator.
AC Machines: Types and working principle of 3 phase induction motors, working principle of synchronous motor, problems on synchronous motors, speed control of induction motors, plugging of an induction motor, working principle of an alternator.
Protective Devices: Fuses - types, air break switches, air circuit breakers, oil circuit breakers, principle of underground signaling in mines, types of motor enclosures in mines
Power Distribution in Mines: Single line diagram of power distribution on surface and in underground mines, Cables – various types for surface and underground mines, Flameproof apparatus, Intrinsically safe apparatus, Standard voltage levels for mining as per IER 1956.
Mine Illumination: Definition, laws of illumination, types of lighting sources, comparison of conventional and solid state lighting, general lighting in underground and surface mines, standards of mine lighting, LED lighting – working, types used in underground and surface mines.