Insulating oils are used in power transformers to provide cooling, insulation and protection against corona and arcing. Transformer oils are exposed to mechanical and electrical stress as well as chemical contaminations during the operation of the transformer.  These lead the original properties of the transformer oil to change, which can reduce the functionality of the oil. In order to maintain and extend the life of the transformer, regular testing of the transformer oil is required. Multiple tests are used to assess transformer oil.

Learning Objectives:

• Explain the intended purpose of tests performed on insulating liquids. Including:
  • Dielectric Breakdown
  • Power Factor
  • Degree of Polymerization
  • Furans
  • Dissolved Gas Analysis
  • Acidity / Neutralization Number
  • Color and Visual Tests
  • Moisture Content, and
  • Interfacial Tension

Prerequisites …

Participants should understand basic electrical theory.