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Testing of Dry Type Transformer

In this transformer, insulation breakdown is the most frequently occurred failure which results in severe faults like earth faults or phase-phase winding. Based on the tests only the condition of insulation for the component parts in the transformer like core, windings, and bushings can be determined. In oil type transformer, the condition of winding insulation can be determined by using the common method like dissolved gas analysis but it cannot be achievable in dry-type transformers. There are different tests that include the following.

  • Tests for partial discharge
  • Insulation resistance tests
  • Analysis of frequency response
  • Polarization index tests
  • Thermographic surveys
  • Measurement tests for dielectric loss angle
  • Acoustic emission tests