Lecture04

Lecture04 - Ideal 1~ Transformer Model Ideal Flux linkages...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Page 1 Fundamentals of Power Systems Lecture 4 1 Ideal 1~ Transformer Model Source Load V 2 V 1 N 1 N 2 Ideal 2 1 N N a = i 2 i 1 1 2 2 1 2 1 2 1 i i e e v v N N a = = = = φ λ 2 2 1 1 , N N = = 2 2 1 1 , e v e v = = Flux linkages (winding flux) z Dot convention ± Current into doted end produces positive MMF (N·I) or “ampere-turns” ± Therefore, orientation of i 1 and i 2 must be as shown to cancel MMF which is necessary to maintain a finite flux in an “ideal (iron) core” Z L Fundamentals of Power Systems Lecture 4 2 Loads on an Ideal Transformer 2 22 0 L V II Z θ ∠° = =∠ 2. Calculate the load current from the voltage and load impedance ° = ° = 0 0 2 1 2 V a V V 1. Solve for the secondary voltage 3. Solve for the primary current = = 1 2 1 I a I I 12 2 2 in L Va V V Z aa Z a I == = = Equivalent modeling:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Page 2 Fundamentals of Power Systems Lecture 4 3 Example: Ideal 1~ Transformer See Book, Example 3-1, p. 90 Fundamentals of Power Systems Lecture 4 4 Real Transformer: Magnetizing Inductance Flux density B [Vs/m s] or [T] Flux φ [Vs] or [Wb] Magnetic field strength H [A/m] Magnetomotive force (MMF) [A-turns] Saturation In linear region φ = / = i m ·N/ … reluctance, “resistance” of magnetic circuit 2 mm m m Ni di di dN eN L dt dt dt ⎛⎞ == = ⎜⎟ ℜℜ ⎝⎠ pp SS Ni =−
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/10/2011 for the course EEL 3216 taught by Professor Brooks during the Fall '08 term at FSU.

Page1 / 10

Lecture04 - Ideal 1~ Transformer Model Ideal Flux linkages...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online