By Edward J. Rothwell, Michael J. Cloud
Protecting the elemental thought of electrical strength transformers, this ebook presents the history required to appreciate the elemental operation of electromagnetic induction as utilized to transformers. The ebook is split into 3 primary groupings: one stand-alone bankruptcy is dedicated to conception and ideas, 9 chapters separately deal with significant transformer varieties, and fourteen chapters conceal many ancillary issues linked to strength transformers. in the course of the e-book, tables, charts, pictures, and equations describe the operation and function of energy transformers and facilitate the reader's figuring out of the technical fabric.
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Additional info for Electric Power Transformer Engineering
15 Helical winding during assembly. 3 Taps-Turns Ratio Adjustment The ability to adjust the turns ratio of a transformer is often desirable to compensate for variations in voltage that occur due to the regulation of the transformer and loading cycles. This task can be accomplished by several means. There is a signiﬁcant difference between a transformer that is capable of changing the ratio while the unit is on-line (a load tap changing [LTC] transformer) and one that must be taken off-line, or de-energized, to perform a tap change.
4). 5 Conductor Insulation The most common insulation today for high-voltage windings is an enamel coating on the wire, with kraft paper used between layers. Low-voltage strip can be bare with paper insulation between layers. The use of paper wrapping on strap conductor is slowly being replaced by synthetic polymer coatings or wrapping with synthetic cloth. For special applications, synthetic paper such as DuPont’s Nomex®1 can be used in place of kraft paper to permit higher continuous operating temperatures within the transformer coils.
3 Liquid-Temperature Indicator Liquid-temperature indicators measure the temperature of the internal liquid at a point near the top of the liquid using a probe inserted in a well and mounted through the side of the transformer tank. 4 Winding-Temperature Indicator A winding-temperature simulation method is used to approximate the hottest spot in the winding. An approximation is needed because of the difﬁculties involved in directly measuring winding temperature. The method applied to power transformers involves a current transformer, which is located to incur a current proportional to the load current through the transformer.