Electrical Machines and Equipment
Electrical Machines and Equipment
Electrical Machines and Equipment
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<strong>Electrical</strong> Technology Department<strong>Electrical</strong> <strong>Machines</strong> & <strong>Equipment</strong>sDetailed Theoretical ContentsHours Contents Related Tasks4-Single-phase transformers20 Constructional features, types, <strong>and</strong> theory of operation oftransformers. The ideal transformer. EMF equation <strong>and</strong> transformation ratio. Equivalent circuit. The equivalent circuit referred to either the primary orsecondary winding. Phasor diagram at no-load <strong>and</strong> at full load. No-load <strong>and</strong> short-circuit tests. Load test. Determination of transformer parameters. Losses <strong>and</strong> 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 <strong>and</strong> 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,<strong>and</strong> 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 -
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