Power Transformers: Principles and Applications
Complete with equations, illustrations, and tables, this book covers the basic theory of electric power transformers, its application to transformer designs, and their application in utility and industrial power systems. The author presents the principles of the two-winding transformer and its connection to polyphase systems, the origins of transformer losses, autotransformers, and three-winding transformers and compares different types of transformer coil and coil construction. He describes the effects of short circuits on transformers, the design and maintenance of ancillary equipment, and preventative and predictive maintenance practices for extending transformer life.
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A-connected ampere ampere-turns autotransformer bushings calculated clip test common winding conductor cooling class copper losses core and coil core form transformer core leg core losses dead band electrical equal equivalent circuit Example exciting current fault current Filtered oil flux density forces high-voltage IEEE induced voltages insulation KVA base KVA rating leakage reactance load current load tap changer magnetic centers magnetic flux magnetizing current nameplate neutral oil level operating output path phase angle phase rotation phase sequence networks phase-to-ground fault phase-to-neutral phase-to-phase power transformers primary and secondary primary voltage primary winding secondary voltage secondary windings sequence currents series impedance series winding shown in Figure single-phase transformers sinusoidal symmetrical components tap changer terminals tertiary winding test report three-phase three-winding transformer trans transformer connection transformer impedance transformer tank turns ratio two-phase two-winding transformer unit vector diagram volt voltage rating voltage surge Y-Y connection zero phase sequence zero-sequence
Page 1 - Standards, a transformer is an electric device, without continuously moving parts, which by electromagnetic induction transforms electric energy from one or more circuits to one or more other circuits at the same frequency, usually with changed values of voltage and current.
Page 1 - ... wide band of frequencies, they are used to provide direct-current isolation, signal splitting and combining functions, specific current or voltage ratios, impedance matching, and phase inversion. The Institute of Electrical and Electronics Engineers, Inc. (IEEE) has defined a transformer as follows: "A static device consisting of a winding, or two or more coupled windings, with or without a magnetic core, for introducing mutual coupling between circuits. Note: Transformers are extensively used...
Page 67 - American National Standard Terminal Markings and Connections for Distribution and Power Transformers.
Page 257 - Insulation power factor is the ratio of the power dissipated in the insulation in watts to the product of the effective voltage and current in voltamperes when tested under a sinusoidal voltage and prescribed conditions.