Electrical Transformers Testing and Maintenance
Details
Electrical Transformers Testing & Maintenance
COURSE DESCRIPTION:
This course covers the theory, operation, maintenance, and testing of power Transformers and auxiliary equipment. Topics included are transformer fundamentals, transformer ratings, transformer cooling, nitrogen gas systems and insulation systems. The course concludes with in-depth discussions on transformer testing techniques. This course is applicable to technicians and engineers who need a sound understanding of power transformer operation and maintenance.
Attendance will learn safe and proper maintenance and testing procedures on pad- mounted, power transformers. The course covers transformers used in commercial and industrial power distributions systems, including oil and dry-type units. Larger power transformers used in utility applications are also covered.
Load and no-load tap changer maintenance, ac and dc testing, routine inspections and oil sampling and testing are covered in detail. Students will learn how to perform routine oil tests, and understand how to perform the major tests that are required. A variety of electrical test equipment from various manufacturer’s will be discussed.
LEARNING OUTCOMES:
Upon completion of this course, the participant should be able to:
- Explain the basic operations of a transformer.
- Discuss turns ratios and calculate terminal voltage and current.
- Discuss terminal markings and various single phase wiring schemes. ( WYE or DELTA )
- Explain how to perform a potential transformer.
- Discuss the electrical testing performed on transformers such as insulation resistance testing, excitation and power factor testing.
- Discuss the various tests performed on insulating oil.
COURSE OUTLINE:
1- Transformer Principles.
* Transformers.
* Right hand rule.
* Magnetic Induction.
* Left Hand Rule Turns Ratio.
* TransformerLosses.
* Transformer Types.
2- Vector Diagrams.
* Operating Principles.
* Operation without Load.
* Operation with Load.
3- Transformer Classifications:
a- Service Classification.
b- Instrument Transformer.
* Current.
* Potential.
4- Transformer Construction (Construction).
a- Magnetizing Circuits.
b- Losses.
* Hysteresis Loss.
* Eddy- Current Loss.
c- Efficiency.
5- Cooling.
* Air Cooled.
* Oil- Immersed.
* Water- Cooled.
* Forced- Oil Cooling.
* Self- Cooling with Air Blast.
* Temperature Limits.
6- Transformer Loading.
7- Tap Changers.
* No- Load Tap Changer.
* Tap Changing Under Load.
* Phase- Angle Control.
8- Transformer Connections.
* Single Phase Circuits.
* Tow- Phase Circuits.
* Three- Phase Circuits.
9- Transformer Maintenance.
* Insulation Testing.
* High Potential Testing.
* Turns Ratio Testing.
* Polarity Testing.
* Power Factor.
* Excitation Current.
* DC Winding Resistance.
* Polarization Recovery.
* Insulating Fluid Dielectric.
* Dissolved Gas Analysis.
10- Transformers and Relaying
* Transformer Faults
* Differential Relaying
* External Faults
* Internal Faults
Target Audience:
Engineers and Technicians
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Alex for You Center is a professional public service institution that provides support and development of the vocational education for all subjects interested in vocational education in Egypt.
Alex for You was founded; opening Ceremony was held in October 2003 in Hilton Green Plaza Hotel. Businessmen, Industrialists and human resources managers attend this ceremony, and representatives of famous industrialists in Egypt.
As we have good relations with Alexandria University and professional engineers in industry, we have motivated the experts to direct their experience towards industry through professional training courses which gather round development, modernization and practical applications.
Alex for You Mission
The mission of the Alex for You Center is to provide quality vocational education and training in accordance to the needs of the labor market, to contribute in raising the level of youth employment, and to improve the efficiency and the competitiveness in the economy.
Alex for You Center would achieve its mission creating climate for establishing flexible system for vocation education based on the philosophy of lifelong learning as:
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