High-voltage test transformers can be divided into two types of maintenance: one is called "restorative maintenance," and the other is called "renovative maintenance." The former involves thorough inspection, eliminating known defects, replacing sealing gaskets, replacing certain components according to original specifications, and treating leaks, etc.; the latter, in addition to the above, includes updating components or rewinding coils, etc. The former does not change the original design structure, while the latter makes certain improvements.

　 Which type of maintenance to adopt depends on the structural characteristics, operating history, and symptoms of the high-voltage test transformer. Once the type of maintenance is determined, the maintenance items can be easily identified. The confirmed maintenance items should be listed in detail in the maintenance plan.

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