This is a laboratory course covering the following topics: high-voltage equipment, plasma, surge propagation, AC motors and generators, power electronics, electric power system analysis, and magnetically suspended motors, which are based on the electromagnetic theory and electrical circuit theories.
Through experiments and simulations, students deepen their comprehension of subjects and develop the abilities required of electrical engineers. Additionally, through this experiential learning, students will develop practical skills that are essential to become successful engineers and researchers. These include teamwork, leadership, and communication skills; safety training and experience with electrical devices and machines; methods to obtain and process data; and the ability to draw conclusions from findings and write technical reports.
By the end of this course, students will be able to do the following.
1. Understand the basic principles of pulsed or AC high-voltage generation and develop practical skills in the operation, measurement, data acquisition, and analysis of high-voltage equipment.
2. Explain the characteristics of thermal and non-thermal plasmas, and their applications. Measure plasma using electrical or optical methods.
3. Understand the basic properties of electric surge propagation in electric power system and explain the differences between distributed and lumped parameter circuits.
4. Understand the mechanisms of a DC circuit breaker that uses power semiconductor devices, and analyze the fault voltage and current values in an electric power system.
5. Understand six- and twelve- pulse rectifier systems and explain the roles of the inductor and capacitor used in a semiconductor power converter.
6. Understand the working principles of an induction motor based on measurements of the slip frequency and secondary current. Explain the basic characteristics of synchronous generators based on the results of a no-load test and short-circuit test.
7. Understand the principles of magnetic levitation and magnetic bearings using iron- ball-levitation equipment.
high-voltage, large-current, impulse voltage, sparking voltage, dielectric breakdown, voltage divider, current transformer, arc discharge, glow discharge, dielectric discharge, spectroscopic measurement, ozone, surge voltage, distributed parameter circuit, lump parameter circuit, electric power system, semiconductor circuit breaker, fault analysis, power electronics, diode rectifier, harmonic current, magnetic levitation, electromagnetic suspension, magnetic bearing, bearing less motor, control
|✔ Specialist skills||Intercultural skills||✔ Communication skills||Critical thinking skills||✔ Practical and/or problem-solving skills|
Students work in teams throughout this course and conduct experiments with seven themes twice weekly in a two-period session. Each class is spent preparing and carrying out experiments, analyzing data, or writing reports by cooperating with each other. Each report must be submitted by a specified date. Students must read the experiment manual before the start of each experiment to ensure safety and smooth operation.
|Course schedule||Required learning|
|Class 1||Orientation||Interim registration, assignment to small groups|
|Class 2||Theme 1: High-voltage and pulsed large-current 1) Principles of impulse voltage generator, pulsed high-voltage measurement, and transient circuit analysis 2) Make a Rogowski coil for pulsed large-current measurement.||Confirm the values of a Marx circuit element; compare the experimentally obtained waveform with the calculated one. Make a current transformer and calibrate it using a commercial one.|
|Class 3||Theme 2: Plasma 1) Atmospheric barrier discharge and glow discharge, spectroscopic measurement 2) Electric charge measurement, plasma chemical reactions, water treatment||Measure the discharge characteristics of barrier and glow discharges; show the unique properties of both discharges. Study the measurement methods for dielectric barrier discharges and their applications.|
|Class 4||Theme 3: Traveling wave and electric surge 1) Matching condition of traveling wave and reflected wave measurement 2) Calculation of reflection coefficient and transient circuit analysis||Measure the reflected waves at the connection of a cable and a resistor. Conduct numerical calculations with MS Excel and LTspice.|
|Class 5||Theme 4: Power control 1) Semiconductor circuit breaker 2) Fault analysis||Understand the operation and mechanism of a semiconductor circuit breaker for fault current interruption. Conduct a fault analysis in a power system by simulation|
|Class 6||Theme 5: Harmonics and unbalanced state 1) Rectifier (two days)||Understand the basic properties of six- and twelve- pulse rectifiers. Comprehend the role of an inductor or capacitor in a semiconductor power converter.|
|Class 7||Theme 6: Motor and generator 1) Slip frequency, secondary voltage and current and starting characteristics of induction motor 2) Open terminal voltage, short-circuit current, synchronous impedance||Understand the working principles of induction motors through measurements of the slip frequency and secondary current. Understand the basic characteristics of a synchronous generator through no-load or short-circuit tests.|
|Class 8||Theme 7: Magnetic levitation 1) Basic principle of magnetic levitation 2) Frequency response, loop transfer function, control parameters||Levitate an iron ball by adjusting the gain of a PID controller. Understand the control principles of magnetic levitation and magnetic bearing through an experiment on iron-ball levitation.|
An experimental textbook is provided during class by OCWi.
See the experimental textbook.
Full attendance and completion of all experiments are compulsory.
Students will be assessed based on the submitted reports and their evaluations.
The instructor may fail a student if he/she repeatedly comes to class late or resubmits reports too often.
Although there are no prerequisites, enrollment in the related courses is desirable.