Knowledge in Electrical machines
electrical machine
MODULE- I Philosophy of Protection The purpose of an Electric Power System is to generate and supply electrical energy to consumers. The power system should be designed and managed to deliver this energy to the utilization points with both reliability and economically The capital investment involved in power system for the generation, transmission and distribution is so great that the proper precautions must be taken to ensure that the equipment not only operates as nearly as possible to peak efficiency, but also must be protected from accidents The normal path of the electric current is from the power source through copper (or aluminium) conductors in generators, transformers and transmission lines to the load and it is confined to this path by insulation. Nature of Faults Short circuit fault- current Open circuit fault- voltage In terms of seriousness of consequences of a fault, short circuits are of far greater concern than open circuits, although some open circuits present some potential hazards to personnel Classification of short circuited Faults • Three phase faults (with or without earth connection) • Two phase faults (with or without earth connection) • Single phase to earth faults Classification of Open Circuit Faults • Single Phase open Circuit • Two phase open circuit • Three phase open circuit
Shantha Kumar . V
electrical machine - 2
The induction machine was invented by NIKOLA TESLA in 1888. Right from its inception its ease of manufacture and its robustness have made it a very strong candidate for electromechanical energy conversion. It is available from fractional horsepower ratings to megawatt levels. It finds very wide usage in all various application areas. The induction machine is an AC electromechanical energy conversion device. The machine interfaces with the external world through two connections (ports) one mechanical and one electrical. The mechanical port is in the form of a rotating shaft and the electrical port is in the form of terminals where AC supply is connected. There are machines available to operate from three phase or single phase electrical input. In this module we will be discussing the three phase induction machine. Single phase machines are restricted to small power levels.
electrical machine - 2 -2
The induction machine was invented by NIKOLA TESLA in 1888. Right from its inception its ease of manufacture and its robustness have made it a very strong candidate for electromechanical energy conversion. It is available from fractional horsepower ratings to megawatt levels. It finds very wide usage in all various application areas. The induction machine is an AC electromechanical energy conversion device. The machine interfaces with the external world through two connections (ports) one mechanical and one electrical. The mechanical port is in the form of a rotating shaft and the electrical port is in the form of terminals where AC supply is connected. There are machines available to operate from three phase or single phase electrical input. In this module we will be discussing the three phase induction machine. Single phase machines are restricted to small power levels.
Basic electricity Principles
the pdf contaiins basic information about different electricity principles and there practical uses in the electrical machines to furtger analyze it
Shivansh Nigam
Basic Circuit Analysis
1)Fundamental quantities 2)Unit of measurement 3)Power and Energy 4)Direction and Polarity 5)Independent Sources 6)Dependent Sources 7)Circuit 8)Kirrchoff's Law 9)Overview of Analysis 10)Star to Delta Conversion 11)Delta to Star Conversion 12) Thevenin and Norton theorems 13)Mesh Analysis 14)Nodal Analysis 15)Superposition
Khushboo Gupta
Transformers
*state the purpose of a transformer. • explain the principle of mutual induction. · • determine the output voltage of a transformer if the input voltage and turns ratio are known. • determine the full-load current of a transformer given the kVA and voltages of the primary and secondary windings. • identify the common types of transformers from their schematic diagrams. • read transformer winding diagrams and connect a transformer for the desired primary and secondary voltage. • choose the proper transformer taps to obtain the desired output voltage. • connect buck and boost transformers to obtain desired voltage for a single-phase application. • choose the correct transformer kVA for the application, given the voltage, current, and phase requirement of a load. • size overcurrent protection for dry-type transformers operating at 600 V or less. • size the feeder conductor for the transformer and wires from the transformer to loads. • properly ground a transformer, and the secondary electrical system produced by the transformer.
DC Machines
DC machines 1)Definition 2)Generator with a load 3)Generator Field excitation 4)Classification of Generators DC Motors
Three Phase Induction Motor
A. PREPARATION 1. Introduction 2. The Rotating Field 3. Rotor Currents 4. Induction Motor Equivalent Circuit 5. Torque and Power Characteristics 6. Operation Beyond the Range 0 < s < 1 7. Determination of Motor Constants 8. Bibliography B. EXPERIMENT 1 . Equipment List 2. Speed and Direction of Rotation 3. Starting Current 4. No Load Test 5. Locked Rotor Test C. REPORT
Single Phase Induction Motor
1)Introduction 2)Types of Single phase motor 3)Single phase induction motors a)advantages and disadvantages b)construction c)working 4)Double Revolving Field Theory 5)Equivalent Circuit 6)Starting Methods of Single Phase Induction Motor
Synchronous Motors
synchronous motors hysteresis motors synmogen
Special Electric Motors
1)Introduction 2)Submersible electric motors 3)Permanent magnet motors 4)Direct current motors 5)High-speed electric motors 6)Brake motors 7)Oil cooled electric motors 8)Water cooled electric motors 9)Naval motors
Some more special motors
Brushless DC Motors Switched Reluctance