Lec5 - 341 Energy Conversion - Updated

Lec5 - 341 Energy Conversion - Updated - Lec5 1F...

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341 - Electric Machinery Fundamentals MI - 1 Lec5 1 F Transformers Mahesh S. Illindala
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341 - Electric Machinery Fundamentals MI - 2 Objectives Knowledge (repeating from memory): Define a transformer and describe it functionality Comprehension (demonstrating understanding of terms and concepts): Discuss the principles of an ideal transformer Distinguish the various non-idealities in a real transformer Application (apply learned information to solve a problem): Calculate and plot the magnetization current of a transformer when it is run at 230 V on a (i) 60 Hz power source, and (ii) 50 Hz power source Analysis (breaking things down into their elements, formulating theoretical explanations or mathematical or logical models for observed phenomena): Explain the various components of a transformer equivalent circuit
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341 - Electric Machinery Fundamentals MI - 3 Existing Transmission Lines (2011) – US Grid Transformers enable stepping up the voltage to higher levels for high efficiency transmission over long distances from a central generating station, and later stepping down to a low voltage for distribution to customers. (cf. Lec3 – Supplement)
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Transformers Figure: (A) Core-type, and (B) shell-type transformer construction A transformer is a device that changes ac electric power at one frequency and voltage level to ac electric power at the same frequency and another voltage level Figure: Ideal transformer sketch with windings and polarities High voltage Low voltage primary winding secondary winding Basis for transformer action: Faraday’s law: If a flux passes through a turn of a coil of wire, a voltage will be induced in the turn of wire that is directly proportional to the rate of change in the flux with respect to time.
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Lec5 - 341 Energy Conversion - Updated - Lec5 1F...

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