TRAINING COURSE: Transformer Operational Principles, Selection & Troubleshooting

MODULE (02): TRANSFORMER CONSTRUCTIONAL DETAILS

• 2.1 Transformer Oil:
• 2.1.1 Characteristics
• 2.1.2 Oil Oxidation
• 2.1.3 Breakdown Voltage
• 2.1.4 Water Content
• 2.1.5 Acidity
• 2.1.6 Oil and Field Oil Testing
• 2.1.7 Dissolved Gas Analysis
• 2.1.8 Treatment and Filtering of Oil
• 2.2 Effect of Oil Expansion
• 2.2.1 Breathing Action
• 2.2.2 Buchholz Relay
• 2.2.3 Explosion Vents
• 2.3 Instrument Transformers
• 2.4 Transformers for Industrial Applications:
• 2.4.1 Electro-chemical,
• 2.4.2 Arc and Induction Furnaces,
• 2.4.3 Rectifier Transformers,
• 2.4.4 High Voltage Testing Transformers,
• 2.4.5 Precipitator Transformers,
• 2.4.6 Dry Type Transformers
• 2.5 Transformer Construction & Details
• 2.5.1 Transformer Cooling
• 2.5.2 Natural Cooling
• 2.5.3 Forced Cooling
• 2.6 Case Studies and Workshop Discussion

MODULE (03): TRANSFORMER FEATURES AND THERMAL PERFORMANCE

• 3.1 Thermal performance and Cyclic Rating of Transformers.
• 3.2 Transformer Impedance,
• 3.3 Electromagnetic Forces
• 3.4 Transformer Construction:
• 3.5 Transformer Windings Construction:
• 3.5.1 Coil Types,
• 3.5.2 Disc Coils,
• 3.5.3 Cross-over Coils,
• 3.5.4 Concentric Coils,
• 3.5.5 Sandwich Coils,
• 3.5.6 Transpositions
• 3.6 Transformer Tanks and Radiators, Tank Losses, Paint Treatments
• 3.7 Transformer Fittings:
• 3.7.1 Lifting Lugs,
• 3.7.2 Undercarriages,
• 3.7.3 Jacking Pads,
• 3.7.4 Tie-Down Lugs,
• 3.7.5 Bleed Pipes,
• 3.7.6 Thermometers
• 3.8 Case Studies and Workshop Discussion

MODULE (04): TRANSFORMER OPERATION AND MAINTENANCE

• 4.1 Distribution Voltage Adjustment, Off-Load Tap Changing, On-Load Tap Changing
• 4.2 Switching of high voltage underground cables supplying Distribution Transformers
• 4.3 Earthling and Over-Current Protection of Distribution Transformers
• 4.4 Transformer Maintenance:
• 4.4.1 Oil p reservation,
• 4.4.2 Deterioration of oil,
• 4.4.3 Breathers,
• 4.4.4 Condition Monitoring,
• 4.4.5 Faults in Transformers,
• 4.4.6 Tappings and Windings
• 4.5 Advanced Transformer Maintenance
• 4.6 Guidelines on how to care for your Distribution Transformer
• 4.7 Case Studies and Workshop Discussion

MODULE (05): TRANSFORMER TESTING

• 5.1 Transformer Routine Tests
• 5.2 Measurement of winding resistance
• 5.3 Measurement of voltage ratio
• 5.4 Measurement of impedance voltage short-circuit impedance and load loss
• 5.5 Measurement of No-load loss and current
• 5.6 Insulation resistance
• 5.7 Harmonics testing
• 5.8 Separate-source power-frequency voltage withstand test
• 5.9 Induced overvoltage withstand test
• 5.10 Transformer Type Tests
• 5.11 Temperature–rise test
• 5.12 Lightning impulse test
• 5.13 Sound level
• 5.14 Special Tests:
• 5.14.1 Transformer Partial Discharge testing
• 5.15 Accuracy and Interpretation of test results and of test reports
• 5.16 Workshop and Tutorials
• 5.17 Questions and Case Studies