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Dissolved gas analysis, measurements and interpretations

Dissolved gas analysis, measurements and interpretations

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Power Transformer Condition Monitoring and Diagnosis — Recommend this title to your library

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Oil-filled power transformers were first conceived and manufactured in the mid-tolate-1800s. They were (and to this day are) an essential component of the electrical power transmission and distribution infrastructure. Power transformers perform a power conversion function. A transformer takes electrical power of certain voltage and current characteristics through its primary terminals and delivers this power on its secondary terminals with changed voltage and current levels. By increasing voltage, and thus reducing the current level, power transformers minimise losses and enable the economical transmission of electrical power over long distances.

Chapter Contents:

  • 1.1 Introduction
  • 1.2 Insulating liquids
  • 1.2.1 Mineral oil
  • 1.3 The transformer as a chemical reactor
  • 1.3.1 Gas production mechanisms
  • 1.4 Oil analysis
  • 1.4.1 Gas chromatography
  • 1.5 Oil sampling
  • 1.5.1 Bottle sampling
  • 1.5.2 Syringe sampling
  • 1.6 Interpretation techniques
  • 1.6.1 Fault types
  • 1.6.1.1 Fault evolution
  • 1.6.2 Techniques that rely on the gas profile
  • 1.6.2.1 Key gas analysis
  • 1.6.2.2 Condition classifications and typical concentrations
  • 1.6.3 Techniques that rely on ratios
  • 1.6.3.1 Dörnenburg ratios
  • 1.6.3.2 Rogers ratios
  • 1.6.3.3 Duval triangles and pentagons
  • 1.6.4 Techniques that rely on rates of change
  • 1.6.5 Putting it all together
  • 1.6.5.1 As a fleet condition monitoring tool
  • 1.6.5.2 As a fault-monitoring mechanism
  • 1.7 Future of oil analysis
  • 1.7.1 Online monitors
  • 1.7.2 Larger datasets
  • 1.7.3 Analysis automation
  • References

Inspec keywords: chemical analysis; transformer oil; power transformer insulation; power distribution economics; power conversion; power transmission economics

Other keywords: electrical power distribution infrastructure; power conversion function; dissolved gas analysis; electrical power transmission infrastructure; economical transmission; oil-filled power transformer

Subjects: Organic insulation; Transformers and reactors; Power system management, operation and economics; Power convertors and power supplies to apparatus; Power transmission, distribution and supply

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