EASA’s "Guide for the Repair of Power and Distribution Transformers (EASA AR200)" establishes guidelines for each step of the repair of power transformers. It describes record keeping, tests, analysis, and general guidelines for the repair of power transformers. Transformers covered are liquid-filled distribution or transformers up to 10 MVA and 69 kV, and dry type distribution and power transformers up to 5 MVA and 25 kV. Some of the topics addressed include condition assessment, failure investigation, insulation tests, rewinding of both dry and liquid-filled units, and assessing suitability for service. Entire sections are devoted to winding considerations, repair of dry type transformers, and repair of liquid-filled transformers. An appendix addresses electrical testing safety considerations.
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