Electrical Machine - IES Academy

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India’s No. 1 IES Academy Electrical Machine Contents Chapters Topic Page No. Chapter-6 Chapter-7 Fractional Kilowatt Motors Theory at a glance Previous 20-Years GATE Questions Previous 20-Years IES Questions Previous 20-Years GATE Answers Previous 20-Years IES Answers Armature Windings Theory at a glance Previous 20-Years GATE Questions Previous 20-Years IES Questions Previous 20-Years GATE Answers Previous 20-Years IES Answers 247 247 264 266 271 272 275 275 278 278 279 279 ww.iesacademy.com Email: iesacademy@yahoo.com Page-ii 25, 1 st Floor, Jia Sarai, Near IIT. New Delhi-16 Ph: 011-26537570, 9810958290
1. Transformer Theory at a Glance (For IES, GATE, PSU) Introduction The transformer is a static electromagnetic device, which transfers electrical energy from one electrical circuit to another electrical circuit through the medium of magnetic field (magnetic coupling) and without a change in the frequency. The two circuits are not connected electrically, but coupled magnetically and electromagnetic energy conversion takes place. Since a transformer has no moving part, it has maximum efficiency of all machines. Important applications of a transformer are: 1. For changing voltage and current levels from one circuit to another. 2. For impedance matching of a source and its load for maximum power transfer in electronic and control circuits. 3. For isolating DC while permitting flow of AC between two circuits or for isolation. Main Application Voltage generation is limited to 11kV due to insulation limits, but transmission of electrical power is more economical at higher voltage. So the most important application of power transformer is to step-up & step-down the voltage of the transmission lines. Transformer Construction Based on the manner in which the windings are wound around the magnetic core, the transformers are of two types: (i) core type and (ii) shell type (a) (b) Constructional details of single-phase (a) core-type transformer (b) shell-type transformer www.iesacademy.com E-mail: iesacademy@yahoo.com Page-1 25, 1 st Floor, Jia Sarai, Near IIT. New Delhi-16 Ph: 011-26537570, 9810958290
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Electrical Machine - IES Academy

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