Electrotechnics II

In this course, the basics of electrotechnics are analyzed, with emphasis on the formulas that are used to calculate AC current, voltage and power. The polar representation of AC current and voltage is described, as well as the 3-phase systems, etc.

Objectives

On successful completion of this module the learner will be able to: 1. Understand, analyze and design simple ac circuits. 2. Know the basic power and energy formulas. 3. Make power factor correction in new or old one-phase installations. 4. Understand and analyze three-phase circuits. 5. Make power factor correction in new or old three-phase installations. 6. Understand and analyze resonance circuits. 7. Understand and analyze magnetic-coupled circuits.

Prerequisites

Electrotechnics I. Basic knowledge of DC current.

Syllabus

• Electrical parameters definition in sinusoidal alternating current during steady-state operation – Voltage and current representation as a function of time • Electrical parameters representation as phasors. • R, L, C in AC current. Voltage-current phasors representation • Impedance, series and shunt circuits analysis. • Typical AC current circuits analysis • AC power and power triangles. • Power factor correction – Compensation in single-phase circuits. • Resonance, Comparison with power factor correction. • Three-phase circuits, Y and D connections, AC power in three-phase systems. • Power factor correction in three-phase circuits. • Magnetic-coupled circuits, Ideal transformers and mutual inductance. • Real three-phase transformers – Construction and connections