Theoretical Electrotechnics


Available soon

General characterization





Responsible teacher

Mário Fernando Ventim Neves


Weekly - 5

Total - Available soon

Teaching language



Available soon


Available soon

Teaching method

Available soon

Evaluation method

NL = Laboratory grade = average of two laboratory reports

NT = Theory grade = average of three tests  OR grade of examen


                         NT AND NL MUST BE AT LEAST  9,5


Final Grade   NF = 0,75 * NT + 0,25 * NL    (with NT >=9,5 and  NL>=9,5)

Subject matter

• Sinusoidal regimen. Complex notation. Circuits. Impedance. Vector diagrams. Geometric places with variation of parameters. Power.

• Three phase regimen. Balanced and unbalanced three phase systems. Line quantities and 

line-to-line quantities. Powers. Symmetrical Components.

• Magnetostatics: Ampère’s law. Magnetic circuits. Induction Flux. Coils. Linked flux, induction coefficients, magnetic linkage coefficient. Leakage and leakage induction coefficients. Ferromagnetism. Saturation and Hysteresis. Iron yoke coil.
• Transformer. Composition and equations. Real, perfect and ideal transformers. Leakage induction coefficients. Magnetizing current and iron losses. Reduction to the primary.  Steinmetz’ equivalent circuit. Sinusoidal regimen. Short circuit and open circuit. Tests. Vectorial diagrams. Voltage drop and voltage regulation.
• Electromagnetic fields. Maxwell’s equations. Plane wave solution. Propagation of pulses. Complex notation of vectors. Waves in sinusoidal regimen. Conditions at the borders, Incident and Reflected waves.

• Fields in conducting media. Effect. Rectangular embedded conducting bar and cylindrical conductor cases.
• Transmission Line: Distributed parameters. Propagation of pulses in lossless lines.Sinusoidal Regimen: ondulatory parameters. Standing wave. Reference to Smith’s chart. Input impedance. Line’s equivalent circuits. Short Lines.
• Rotating machine with non-salient poles and distributes winding. Magnetic field distribution in the air gap. Pulsing field. Triphase winding. Rotating field. Machines’ monophase and triphase induction coefficients. Monophase equivalent for triphase regimen.


Programs where the course is taught: