Distribution Transformer Maintenance and Testing Course
Electrical and Power Engineering

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Distribution Transformer Maintenance and Testing Course
Course Overview:
This course intended on improving the hold and grasp on the transformer components and gadgets. Participants will learn the fundamental building blocks of a transformer such as induction, turns ratios, and vector diagrams.
Issues including types of transformers, suitable cooling methods, constructional details including tap changers and transformer connections are also part of the syllabus.
Theoretical approaches to various polarity and insulation tests will also be performed with practical hands-on on gas analysis, fault finding and differential relaying and telemetry.
The course is aimed at engineers and technicians and will equip the participants with knowledge and skills needed to function effectively in power systems using transformers given how intricate and delicate a transformer is.
Course Objectives:
Upon completion of this course, the participant should be able to:
- Explain the basic operation of a transformer.
- Discuss turns ratios and calculate terminal voltage and current.
- Discuss terminal markings and various single phase and three phase wiring schemes. (WYE vs DELTA).
- Explain how to perform a polarity test on 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.
Who Should Attend?
This course is applicable to engineers and technicians who need a sound understanding of power transformer operation and maintenance.
Course Outlines:
Transformer Principle
- Transformers
- Right Hand Rule
- Magnetic Flux
- Magnetic Induction
- Left Hand RuleTurns Ratio
- Transformer Losses
- Transformer Types
- Vector Diagrams
Operating Principles
- Operation Without Load
- Operation with Load
- Transformer Classifications
Service Classification
- Instrument Transformers
- Current
- Potential
- Transformer Construction (Construction)
Magnetizing Circuits
- Losses
- Hysteresis Loss
- Eddy-Current Loss
- Efficiency
- Cooling
- Air Cooled Oil-Immersed
- Water-Cooled
- Forced-Oil Cooling
- Self-Cooling with Air Blast
- Temperature Limits
- Transformer Loading
- Tap Changers
- No-Load Tap Changer
- Tap Changing Under Load
- Phase-Angle Control
- Transformer Connections
- Single Phase Circuits
- Two-Phase Circuits
- Three-Phase Circuits
- 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
- Transformers and Relaying
- Transformer Faults
- Differential Relaying
- Normal Load
- External Faults
- Internal Faults