Electrical Machines and Equipment

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Electrical Technology DepartmentElectrical Machines & EquipmentsDetailed Theoretical ContentsHours Contents Related Tasks4-Single-phase transformers20 Constructional features, types, and theory of operation oftransformers. The ideal transformer. EMF equation and transformation ratio. Equivalent circuit. The equivalent circuit referred to either the primary orsecondary winding. Phasor diagram at no-load and at full load. No-load and short-circuit tests. Load test. Determination of transformer parameters. Losses and efficiency. Conditions of parallel operation of single phase transformers. Auto-transformers. Voltage regulators.Transformer cooling Types of transformer cooling. Advantages of each type of transformer cooling. Effect of cooling on power output and efficiency.B1, C1, C2, C3,C6, D5, D8, D9,E1, E3, E4, E7, E8,E9, J1, J2, J4, J5,J664-Threee-phase transformers Three-phase transformer connections. Classifications if three-phase transformers. Conditions of parallel operation of three-phase transformers,and faults which may occur during connections. Transformation ratio for the different connections of threephasetransformers.B1, C1, C2, C3,C6, D5, D8, D9,E1, E3, E4, E7, E8,E9, J1, J2, J4, J5,J6- 30 -
Electrical Technology DepartmentElectrical Machines & EquipmentsDetailed Practical ContentsHours Contents Related Tasks1-DC Generator experiments:10Separately excited generatorso No load characteristics (The relation between generatedEMF and field current at different speeds).o Load characteristics (The relation between terminalvoltage and load current).Shunt generatorso No load characteristics.o Load characteristics.B1, C1, C2, C3,C6, D5, D8, D9,E1, E3, E4, E7, E8,E9, J1, J2, J4, J5,J6Compound generatorso Load characteristics for both differentially andcumulatively compound generators.882-DC Motor experiments: Load characteristics of shunt motors. Load characteristics of series motors. Load characteristics of both differentially and cumulativelycompound motors.3-Transformer experiments: No-load and short-circuit tests Load test Parallel connection of single phase transformers.B1, C1, C2, C3,C6, D5, D8, D9,E1, E3, E4, E7, E8,E9, J1, J2, J4, J5,J6B1, C1, C2, C3,C6, D5, D8, D9,E1, E3, E4, E7, E8,E9, J1, J2, J4, J5,J6- 31 -
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