410-4115/01 – Transient Effects in Electrical Systems (PJES)
| Gurantor department | Department of Electrical Power Engineering | Credits | 8 |
| Subject guarantor | Ing. Petr Moldřík, Ph.D. | Subject version guarantor | Ing. Petr Moldřík, Ph.D. |
| Study level | undergraduate or graduate | Requirement | Choice-compulsory |
| Year | 1 | Semester | summer |
| | Study language | Czech |
| Year of introduction | 2010/2011 | Year of cancellation | |
| Intended for the faculties | FEI | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
Explaining basic terms and principles of electromechanical transient effects in electric systems. After passing the subject the student is able to calculate symmetric and asymmetric short-circuit in power grid, ground faluts in isolated and compensated power grid and static and dynamic stability of system. The student is also able to practise dimensioning of electric equipment according to effects of short-circuit currents.
Teaching methods
Lectures
Tutorials
Experimental work in labs
Project work
Other activities
Teaching by an expert (lecture or tutorial)
Summary
The subject includes theoretical part of extraordinary states in electric systems. It follows short-circuit in power grid, ground fault in isolated and compensated power grid and system static and dynamic stability. The subject explains basic terms of electromechanical transient effects in electric systems.
Compulsory literature:
1. Anderson, P. M.: Analysis of Faulted Power Systems. IEEE Press Power Systems Engineering Series, 1995, ISBN: 0-7803-1145-0.
2. Machowski, J., Bialek, J.W., Bumby, J.R.: Power system dynamics and stability. Wiley, 1997.
3. Anderson, P.M., Fouad, A.A.: Power system control and stability. Iowa, 1977.
Recommended literature:
Additional study materials
Way of continuous check of knowledge in the course of semester
Processing of reports from laboratory works, design of individual project, test.
Credit conditions: Profit minimum 15 points, attendance at laboratory work.
E-learning
Materials are available at https://lms.vsb.cz/?lang=en.
Other requirements
Additional requirements for the student are not.
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
Lectures:
- Definition and classification of transients.
- Electromagnetic transients in power systems.
- Three-phase short circuit fed by an ideal source.
- Three-phase short circuit of a synchronous machine.
- Three-phase short circuit at the terminals (near) an asynchronous motor.
- Characteristic values of short circuit current in a general network.
- Parameters of power system elements in symmetrical component systems.
- Unsymmetrical operating states of a power system.
- Notes on practical calculation of short circuit currents.
- Calculation of short circuit currents in complex power systems.
- Dimensioning of electrical equipment according to the effects of short circuit currents.
- Earth faults in power systems (in isolated and compensated medium-voltage power grids).
- Transient overvoltages at (intermittent) earth faults.
- Electromechanical transients in power systems.
- The essence of electromechanical transients.
- Static stability (stability of small oscillations) of a simple system alternator - power grid with constant voltage and frequency.
- Dynamic stability (transient stability) of a simple system - rule of areas, oscillation curve.
- Stability of a complex power system.
- Asynchronous operation of a power system.
- Means for improving the stability of a power system
Exercises:
- Introduction, safety training, conditions for obtaining credit.
- Analysis of circuits using the symmetrical components method.
- Short circuits: Calculations of short circuit currents according to ČSN EN 60909-0 (Short circuit currents in 3-phase AC systems).
- Short circuits: Calculations of symmetrical short circuits and asymmetrical short circuits.
- Short circuits: Influence of asynchronous motors on short circuit ratios.
- Short circuits: Checking equipment for the effects of short circuit currents.
- Short circuits: Dimensioning of equipment for thermal and dynamic effects of short circuit currents.
- Earth faults in MV power grids: Calculation of ratios during earth faults.
- Earth faults in MV power grids: Setting/tuning of the compensating coil (quenching choke).
- Power system stability: Calculation of static stability (stability of small oscillations).
- Power system stability: Calculation of dynamic stability (transient stability).
- Assignment and development of an independent semester project.
- Credit test.
Laboratory measurements:
- Measurement of short-circuit currents using DC physical model.
- Measurement of Earth fault using AC physical model.
Projects:
- Modeling and calculation of short circuit ratios (a/symmetrical short circuit currents) in the electrical distribution network, including using selected SW.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction