Summary
Read more on ELECTRAThis Technical Brochure replaces TB 445 (published in 2011)
Maintenance, availability and reliability are closely related and the transformer user has to specify a level of maintenance that will ensure an acceptable level of transformer reliability in the particular context. This guide has been prepared to help transformer users to define and apply best practice for transformer maintenance. Subjects including best practice, component selection, checking and testing in order to evaluate transformer condition, time intervals for the various actions, advanced maintenance activities, and human and material aspects of transformer maintenance.
Table of content
1. Introduction
1.1. Guide for transformer maintenance
1.2. Transformer operation and maintenance cycle
1.3. Standards and CIGRE references
2. Maintenance strategy
2.1. The importance of transformer maintenance
2.2. Condition monitoring
2.3. Time based maintenance and time based condition monitoring
2.4. Condition based maintenance
2.5. Corrective maintenance
2.6. Continuous online monitoring
3. Maintenance process
3.1. Introduction
3.2. Planning
3.3. Organization
3.4. Execution
3.5. Recording
3.6. Optimization
4. Transformer component selection and maintenance
4.1. Bushings
4.2. Oil preservation systems
4.3. Cooling systems
4.4. Gaskets
4.5. Gauges, indicators and relays
4.6. Control cabinet
4.7. Current transformers
4.8. On-load tap changer
4.9. De-energised tap changer
4.10. Lightning (surge) arresters
4.11. Transformer active part
4.12. Sensing and monitoring devices
5. Maintenance action catalogue
5.1. Main tank tests
5.2. Oil and paper tests
5.3. On-load tap changer tests
5.4. Bushing tests
5.5. Maintenance inspection tasks
5.6. Insulation drying
5.7. Physical and chemical oil treatments
5.8. Treating oil for corrosive sulphur problems
5.9. Static electrification and maintenance
5.10. Precautions for invasive work
6. Major work
6.1. Logistics
6.2. Repair/refurbish/replace decision making
Appendix A - SF6 Transformer Maintenance Particularities
Appendix B - Transformer maintenance practices survey questionnaire
Appendix C - Survey detailed results – Task intervals
Appendix D - Operation and Maintenance Manual Content
Appendix E - Maintenance Recording
Appendix F - Additional technical information about Tap Changer Tests
Appendix G - Acronyms used in the brochure
Additional informations
| Publication type | Technical Brochures |
|---|---|
| Reference | 962 |
| Publication year | |
| Publisher | CIGRE |
| ISBN | 978-2-85873-667-6 |
| Study committees | |
| Working groups | WG A2.69 |
| File size | 11 MB |
| Pages number | 190 |
| Price for non member | 300 € |
| Price for member | Free |
Authors
Claude RAJOTTE, Convenor (CA), Ralf SCHNEIDER, Task Force Leader (CH), Marc Foata, Task Force Leader (DE)
Andreas BAER ( DE), Lutz HULKA (AT), Anton BERGSTROM (SE), Paul JARMAN (GB), Stina BERTLILSSON (SE), Toni MELLIN (FI), Colin CLARK (CA), Erik MORTENSEN (DK), Oliver DERIGS (DE), Christophe DOMIN (FR), Christophe ELLEAU (FR), Anatoly SHKOLNIK (IL), Ross WILLOUGHBY (AU), Allan HOLTON (GB), Dan Zhou (CN)
Keywords
Transformer, maintenance, survey, strategies, testing, oil, bushing, oltc, active part, repair
