Table of Content
Transformer- principle and construction
- Working principle of a transformer
- An ideal transformer
- Theory of on-load operation
- Construction
Voltage regulation of transformers
- EMF Equation
- Transformation Ratio
Measurement of losses in a Single phase transformer
- Open circuit of a single phase transformer
- Short circuit test of a single phase transformer
- Parts and construction of a Transformer
- Primary Winding
- Secondary Winding
- Transformer Tank
- Temperature gauge
- Explosion vent
- Conservator
- Function of conservator
- Breather
- Tap-changer
- Buchhoiz relay
- Cooling Tubes
- Inlet valves and outlet valves
- Losses in a transformer
- Copper Losses
- Iron losses
- Eddy current loss
- Hysteresis loss
- Efficiency of a transformer
Transformer on load
- Transformer with resistance and leakage reactance
- Voltage regulation
Testing and Commissioning of three-phase transformer
- Testing of power transformer
- Preliminary tests are
- Core insulation
- Core loss test
- Check of ratio polarity
- Preliminary load loss and impedance voltage
- Final tests
- Routine tests
- Type tests
Three-phase transformer connections
- Star/star connection
- Star-Delta
- Types of insulation testers
- Range of magneto-generator type insulation tester
Voltage regulation of three-phase transformers
Transformer Winding
- Causes of breakdown
- Principal object of maintenance
- Factors affecting the life of transformers
- Effect of moisture
- Effect of oxygen
- Effect of solid impurities
- Effect of varnishes
- Effect of Windings
- Maintenance procedure
- Safety precautions
- Breather
- Plain Breather
- Silica gel breather
- Gaskets
Transformer oil and testing
- Necessity of transformer oil
- Causes for deterioration of transformer oil
- Testing of transformer oil
- Field test of insulating oil
- Crackle test of transformer oil
- Dielectric test of transformer oil
Auto Transformers
- Construction
- Dimmer Stat or variac
Wind a small transformer
- Record the data
- Procedure of rewinding a transformer
- Coil winding machine
- Turn indicator
- Wire-feed control arrangements or setting pitch
- Coil length setting or layer Width setting
- Mandrel
- Wire size and turns
- Stampinsgs
- Testing of transformer after rewinding
- Insulation resistance test
- Load test
- Short circuit test
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