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Life Time Management of Power Transformer

Life Time Management of Power Transformer. C. Sumereder, M. Muhr, B. Körbler Graz University of Technology Dep. High Voltage Engineering. Agenda. Age and aging mechanism of paper/oil insulating systems Condition evaluation dued to age and maintenance Maintenance strategies / risk

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Life Time Management of Power Transformer

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  1. Life Time Management of Power Transformer C. Sumereder, M. Muhr, B. Körbler Graz University of Technology Dep. High Voltage Engineering

  2. Agenda • Age and aging mechanism of paper/oil insulating systems • Condition evaluation dued to age and maintenance • Maintenance strategies / risk • Technical Diagnosis

  3. Age and Aging Mechanism • in general: Law of Arrenhius • Paper/Oil Insulation System: Montsinger

  4. Condition Formula CAGE age condition factor LT expected useful lifetime AGE age A,b,c constants

  5. Maintenance Strategies • TBM Time Based Maintenance: Measures were done in regular intervals Since electricity market is liberalized • CBM Condition Based Maintenance: Monitoring of the network components is essential, monitoring parameters have to be defined: diagnosis level

  6. Maintenance Parameters / Risk • Failure Statistics • Determination of Repair Costs • Repair Time and Procedure • Evaluation of Interrupt Costs • Philosophy of Company • Risk: Watch Diagnosis and Critical Level

  7. Technical Diagnosis • Chemical Diagnostics • Oil Analysis (IEC 60422) • Dissolved and free gasses (IIEC 60567) • Dissolved Furans (IEC 61198) • Electrical Diagnostics • Partial Discharge Measurement (IEC 60270) • Thermal Diagnostics

  8. Age & Ageing Mechanism Maintenance Strategy Overloads Operation Conditions Servicing Inspection Overhaul Experience of Engineers Condition Evaluation Life Time Management of Power Transformers Risk evaluation Value received measures Monitoring Technical Diagnosis

  9. Summary • Maintenance Strategy: Philosophy of utility and producer • Mechanism of Aging: Degradation of paper/oil System • Condition Evaluation: Technical Diagnosis • Experience of engineers

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