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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