Lecture06

Lecture06 - Three-phase transformers Core arrangements...

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Page 1 Fundamentals of Power Systems Lecture 6 1 Three-phase transformers z Core arrangements ± Transformer bank => three 1~ transformers (core type or shell type) ± 3~ transformer (3, 4, 5 legged core-type) z Winding arrangements ± Y-Y ± - ± -Y ± Y- ± With tertiary Fundamentals of Power Systems Lecture 6 2 Core Type vs. Shell Type Core type Shell type
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Page 2 Fundamentals of Power Systems Lecture 6 3 Three-phase transformer core forms Provides some flux path for magnetically unbalanced conditions Fundamentals of Power Systems Lecture 6 4 Y-Y connection = LP LS V a V Neutral possible Neutral possible Magnitudes
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Page 3 Fundamentals of Power Systems Lecture 6 5 - connection = LP LS V a V Magnitudes Fundamentals of Power Systems Lecture 6 6 -Y connection 3 = LP LS V a V 3 = LP LS V V a Magnitudes c’ b’ a’ c’ b’ V LS Neutral possible V LS Attention The terminal connections in Figure 3-37(c) in Textbook leads to a phase transposition (“acb” => “abc”). Therefore, this diagram here
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Lecture06 - Three-phase transformers Core arrangements...

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