High-voltage test transformer maintenance can be divided into two categories: one is called "restorative maintenance", and the other is called "renovative maintenance". The task of the former is to conduct a thorough inspection, eliminate known defects, replace sealing gaskets and replace certain components according to original specifications, and handle leaks, etc.; the latter, in addition to the above items, also 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 should be determined based on the specific conditions such as the structural characteristics, operating history, and symptoms of the high-voltage test transformer. Once the type of maintenance is decided, the maintenance items can be easily determined. The confirmed maintenance items should be listed in detail in the maintenance plan.

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