By Edward J. Rothwell, Michael J. Cloud
ISBN-10: 084931397X
ISBN-13: 9780849313974
Overlaying the basic idea of electrical strength transformers, this e-book presents the heritage required to appreciate the elemental operation of electromagnetic induction as utilized to transformers. The publication is split into 3 basic groupings: one stand-alone bankruptcy is dedicated to thought and rules, 9 chapters separately deal with significant transformer varieties, and fourteen chapters conceal many ancillary themes linked to strength transformers. in the course of the ebook, tables, charts, pictures, and equations describe the operation and function of strength transformers and facilitate the reader's knowing of the technical fabric.
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Additional resources for Electric Power Transformer Engineering
Sample text
Additionally, nonsynchronous paralleling of the UAT and the SST, both connected to the generator auxiliary load, can create high circulating currents that can exceed the mechanical capability of these transformers. Considerations can be made in the design of UAT transformers to account for these possible abnormal operating conditions. 21 Typical simplified one-line diagram for the supply of a generating station’s auxiliary power. © 2004 by CRC Press LLC margin on the mechanical-withstand capability of the windings to account for the possibility of a fault occurring during a period of overexcitation.
The type of steel and arrangement depends on the transformer rating as related to cost factors such as labor and performance. Just like other components in the transformer, the heat generated by the core must be adequately dissipated. While the steel and coating may be capable of withstanding higher temperatures, it will come in contact with insulating materials with limited temperature capabilities. In larger units, cooling ducts are used inside the core for additional convective surface area, and sections of laminations may be split to reduce localized losses.
This concept is sometimes referred to as guided liquid flow. A variety of different types of windings have been used in power transformers through the years. Coils can be wound in an upright, vertical orientation, as is necessary with larger, heavier coils; or they can be wound horizontally and placed upright upon completion. As mentioned previously, the type of winding depends on the transformer rating as well as the core construction. Several of the more common winding types are discussed here.
Electric Power Transformer Engineering by Edward J. Rothwell, Michael J. Cloud
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