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Lecture 13 - UCF Assumptions 1 ∞ ⇒ r μ loss core no(3...

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CF Example 3 UCF For the above 480 V (line to line) industrial distribution system, find: (1) The real and reactive power of load 1 (2) The real and reactive power of load 2 ) Overall power factor of the system (3) Overall power factor of the system (4) The total line current supplied to the system

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CF Example 3 (2) UCF (1) (2)
CF Example 3 (3) UCF (3) (4)

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CF Introduction to Transformer (1) UCF Transformer: A device that changes AC electric power at one voltage level to ac electric power at another voltage level through the action of a magnetic field. Shell-form transformer
CF Introduction to Transformer (2) UCF ore- rm Core form Shell-form

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CF Introduction to Transformer (3) UCF ore- rm Concentric layered winding Vertical layered winding Core form Shell-form
CF Ideal Transformer (1)

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Unformatted text preview: UCF Assumptions: ) 1 ( ∞ ⇒ r μ loss core no (3) loss winding no (2) leakage no (4) p N n = Turns ratio: s N CF Ideal Transformer (2) UCF Voltage relationship: t d N v t d N v s s p p = = φ , n N v dt dt p p = = ⇒ N v s s Current relationship: ∞ = = r μ since core R i i N i N s s p p = n N N i p s s p 1 = = ⇒ CF Ideal Transformer (3) UCF Impedance relationship: i v Z i v Z s load p in = = 2 2 N i v Z p s p in s p ⎟ ⎞ ⎜ ⎛ = n N i v Z s p s load ⎟ ⎠ ⎜ ⎝ ⇒ Power relationship: = = i v P i v P s s s p p p 1 1 = = = ⇒ n n i i v v P P s p s p s p CF Ideal Transformer (4) UCF Dot convention: Put a dot on positive terminal of v p or v s...
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Lecture 13 - UCF Assumptions 1 ∞ ⇒ r μ loss core no(3...

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