8. Synopsis
**Basic things about Electritechnics:**

History. Electricity as energy carrier. AC, DC Current systems.
Multiphase systems.

**Practical circuit calculation methods**

**Definition of the active, reactive power in single phase and 3-phase
systems. Calculations with instantaneous values and phasors. Positive
directions. Definition of the power sign. Y-D conversion. Nominal values.
Per-unit system. **

**Practical calculation methods of energy converters **

**Calculation methods of magnetic circuits. Symmetrical components method.
Three-phase vectors. **

**Transformers**

**Magnetic materials. Hysteresis and eddy-current losses. Induced voltage.
Excitation balance law. Equivalent circuit and its parameters. Phasor diagram.
No-load and short-circuit. Definition of the DROP. 3-phase transformers, connections,
phase-shift, parallel connection. **

**Magnetic field of the electromechanical energy converters**

**Magnetic fields of the electrical machines: stationary, pulsating and
rotating field. Generation of the rotating field. Torque development. Frequency
condition. **

**Operation principles of the basic electromechanical energy converters**

**3-phase synchronous machine. Condition of the steady-state torque.
Synchronous speed. Cylindrical synchronous machine. Equivalent circuit.
Pole-voltage, armature voltage, synchronous reactance. **

**3-hase induction machine. Condition of the steady-state torque.
Slip-ring and squirrel-cage rotor. The slip. Equivalent circuit. **

**The DC machine. The commutation. **

**Power electronics, electrical drives**

**Basic converter connections. Electrical drives: starting, braking, speed
modification.**

**Electrotechnical environment protection**

**Electromagnetic compatibility (EMC). Low and high frequency effects.
Electrostatic discharge. Electromagnetic impulses. **

**Electrical safety regulations**

**Basics, methods, limits, measurements.**

**Electrical energy storage**

**Chemical, electrical, magnetic, mechanical energy storage. Fuel-cells.**

**Electrotechnical applications, trends**

**Requirements of sustainable development. Application of alternative
energy sources. Alternative electrical vehicles. New materials and
technologies. Superconductivity.**

**Laboratory practices:**

**·
****Investigation of high-voltage
discharges.**

**·
****Electric shock protection.**

**·
****The transformer.**

**·
****Electrical rotating machines.**

**·
****Non-conventional energy converters.**