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Lecturer(s)
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Skala Bohumil, Doc. Ing. Ph.D.
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Course content
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Laboratory classes 1. Introduction, safety rules, credit 2. Transformer. Connection of the three 1-phase units. Measurement under non-balanced load 3. Transformer. Three-wound three-phase transformer, various connection, no-load test and short-circuit test 4. Transformer. Evaluation of the no-load test and short-circuit test with respect of equivalent circuit parameters calculation. Calculation of the voltage under the load and its verification. By the measurement. 5. Transformer. Parallel operation, methods of the loading and thermal test. PC measurement. 6. Asynchronous machine. Star-delta starting method with the help of switch and contactors and time-delay relay. PC measurement. 7. Asynchronous machine. Dynamical measurement under starting and under reversing transient phenomena. PC measurement. Evaluation of the no-load test and short-circuit test with respect of equivalent circuit parameters calculation. Parameters calculation for given load. 8. Asynchronous machine. Measurement of the load characteristic and verification. PC measurement. 9. Asynchronous machine. Measurement of the torque and speed pulsation during one mechanical revolution under the load of the pulsating torque. PC measurement. 10. Asynchronous machine. Methods of the determination beginning and ends of the winding after machine terminal disconnection. 11. Asynchronous machine. One-phase two-speeds motor. Winding connection and terminal connection. 12. Asynchronous machine. Methods of the measurement very small slip speeds of the large asynchronous machines. Practical test on the machine of a power 45 kW. 13. Credit
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Learning activities and teaching methods
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Laboratory work, Seminar, Practicum
- Preparation for comprehensive test (10-40)
- 32 hours per semester
- Contact hours
- 26 hours per semester
- Preparation for laboratory testing; outcome analysis (1-8)
- 20 hours per semester
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| prerequisite |
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| Knowledge |
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| The knowledge and abilities on the level of the courses KET/+EM, KTE/+UE a KTE/+TE1. Further, to know the principles of the measurement of electrical resistivity, voltage and current. To design the connection of instruments for power measurement in 3-phase networks. To analyze the interaction of the magnetical fields and electrical current in a wire. To demonstrate the knowledge of Lenze, Faraday and Kirchhoff laws. To apply basic mathematical operations and electrotechnical relations, to be able to express the results numerically, to know the labeling of electrotechnical magnitudes and their physical units. |
| learning outcomes |
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| The students ? interpret the principles of operation of transformers and electrical machines ? apply the knowledge of the measurement in DC current circuits and perform the analysis of the electrical drive, summarize the requirements posed on it ? sketch out the scheme of a given existing connection of an electrical machine and perform the analysis of the electrical drive, summarizing the requirements placed upon it ? write down the relations which they need for solving the task, substitute the variables with numbers and calculate the result ? put the given connection into operation under the laboratory conditions |
| teaching methods |
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| Seminar |
| Practicum |
| Laboratory work |
| assessment methods |
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| Skills demonstration during practicum |
| Individual presentation at a seminar |
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Recommended literature
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Bartoš, Václav; Skala, Bohumil. Měření na elektrických strojích. 2. vyd. Plzeň : Západočeská univerzita, 2006. ISBN 80-7043-447-3.
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Skala, Bohumil; Žížek, František. Měření a zkoušení elektrických zařízení : využití počítače pro řízení experimentů a sběr dat. 1. vyd. Plzeň : Západočeská univerzita, 2004. ISBN 80-7043-306-X.
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