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1. Consult the files to understand the operation status of the relevant transformers.

1) the defects and exceptions (accidents) found in operation, the number and situation of short circuited exports;

2) load, temperature and operation of auxiliary devices;

3) consult the last overhaul summing up report and technical file;

4) consult the test records (including oil analysis and chromatographic analysis) to understand the insulation status.

5) check the leakage parts and mark them.

6) carry out tests before overhaul and identify additional maintenance items.

2. The major contents of the overhaul technology and organization plan are as follows:

1) personnel organization and division of labor;

2) construction project and schedule.

3) construction plan for special projects;

4) ensure construction safety and quality technical measures and on-site fire prevention measures;

5) the main construction tools, equipment list, main materials list;

6) draw up the necessary construction drawings.