On-site overhaul operation instruction book for 35kV and above oil-immersed power transformers This operation instruction book refers to the requirements of relevant standards, regulations, and anti-accident technical measures, combined with on-site maintenance safety requirements, and summarizes the on-site maintenance work experience of maintenance operators of the North China Power Grid and maintenance personnel of relevant manufacturers. The main contents include: overhaul projects, overhaul tests and trial runs, preparations before overhaul, dismantling and assembly of transformers, lifting and handling of transformers, transformer body maintenance, transformer oil draining, oil filling, oil treatment, transformer drying, on-load tap changer maintenance, transformer component maintenance, transformer painting, transformer overhaul acceptance and trial run, etc. On-site overhaul work instructions for 35kV and above oil-immersed power transformers Contents 1 Scope 2 Normative references 3 Overhaul items 4 Overhaul test and trial run 5 Preparation before overhaul 6 Disassembly and assembly of transformer 7 Lifting and handling of transformer 8 Transformer body overhaul 9 Transformer oil draining, oil filling and oil treatment 10 Transformer drying 11 On-load tap changer overhaul 12 Transformer component overhaul 13 Transformer painting 14 Transformer overhaul acceptance and trial run Appendix A (Informative Appendix) Transformer overhaul summary report Appendix B (Informative Appendix) Overhaul inspection and processing record Appendix C (Informative Appendix) Hazard identification, risk assessment and control Appendix D (Informative Appendix) Transformer overhaul flow chart
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