Transformer ; Maintenance and Testing
Deskription
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 source 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.
Students
will learn safe and proper maintenance and testing procedures on pad-mounted,
power transformers. The course covers transformers used in commercial and
industrial power distribution 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.
Upon
completion of this course, the participant should be able to:
v
Explain the basic operation
of a transformer.
v
Discuss turns ratios and
calculate terminal voltage and current.
v
Discuss terminal markings
and various single phase and three phase wiring schemes. (WYE vs DELTA).
v
Explain how to perform a
polarity test on a potential transformer.
v
Discuss the electrical
testing performed on transformers such as insulation resistance testing,
excitation and power factor testing.
v
Discuss the various tests
performed on insulating oil.
Materi :
1. Transformer
Principles
Ø
Transformers
Ø
Right Hand Rule
Ø
Magnetic Flux
Ø
Magnetic Induction
Ø
Left Hand RuleTurns Ratio
Ø
Transformer Losses
Ø
Transformer Types
2. Vector Diagrams
Ø
Operating Principles
Ø
Operation Without Load
Ø
Operation with Load
3. Transformer
Classifications
Ø
Service Classification
Ø
Instrument Transformers
a.
Current
b.
Potential
4. Transformer
Construction (Construction)
Ø
Magnetizing Circuits
Ø
Losses
a.
Hysteresis Loss
b.
Eddy-Current Loss
Ø
Efficiency
5. Cooling
Ø
AirCooled Oil-Immersed
a.
Water-Cooled
b.
Forced-Oil Cooling
c.
Self-Cooling with Air Blast
Ø
Temperature Limits
Ø
Transformer Loading
6. Tap Changers
Ø
No-Load Tap Changer
Ø
Tap Changing Under Load
Ø
Phase-Angle Control
7. Transformer
Connections
Ø
Single Phase Circuits
Ø
Two-Phase Circuits
Ø
Three-Phase Circuits
8. Transformer
Maintenance
Ø
Insulation Testing
Ø
High Potential Testing
Ø
Turns Ratio Testing
Ø
Polarity Testing
Ø
Power Factor
Ø
Excitation Current
Ø
DC Winding Resistance
Ø
Polarization Recovery
Ø
Insulating Fluid Dielectric
Ø
Dissolved Gas Analysis
9. Transformers and
Relaying
Ø
Transformer Faults
Ø
Differential Relaying
a.
Normal Load
b.
External Faults
c.
Internal Faults
Coordinator
Tugino, ST MT
·
Expert in Electrical Engineering
·
Experienced in
many project of Electrical
Who Should Attendant :
Field and shop
technicians, field engineers, supervisors and others responsible for the
testing and maintenance of power transformers rated 750kVA to 500MVA and 4.16kV
to 500kV.
Method
1. Presentation
2. Discuss
3. Case Study
4. Evaluation
5. Practice
