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PROTECTION, O & M AND CONDITION MONITORING OF TRANSFORMERS

COURSE DESCRIPTION :

          Protection

• Recommended over current protections for delta-star and star-star transformers for different ratings.

• Differential and REF protections; stability and sensitivity tests, protection comparison.

• Rectiformer protection.

          Operation and Maintenance

• Over loading of transformer vs reduction in insulation life.

• Transformer oil: type, definitions and acceptable values

• Drying of transformer.

• Oil filtration-modern techniques, off line and on line.

• DGA: Test, Limiting values, Case Studies.

          Condition Monitoring

• Winding

  • Measurement of winding resistance.

  • Measurement of winding impedance.

  • Turns Ratio Test.

  • Measurement of IR and PI.

  • Measurement of Capacitance and tan delta.

  • Recording of partial discharge.

  • Magnetic balance test.

  • Vector group test.

• Bushing

  • Visual inspection.

  • Measurement of IR.

  • Measurement of Capacitance and tan delta.

  • Recording of partial discharge.

• Insulating Oil

  • Visual inspection.

  • Oil tan delta test.

  • Oil dielectric constant test.

  • Oil resistivity test.

  • Oil breakdown Down Voltage Test.

• Summary of recommended tests and their periodicity.