the every 6 months transformer preventive maintenance
- pressure test for sealed tarnsformer ( look for leakage in nitrogen pressure )
- oil test take sample and checkgas in oil" analysis
- ground resistance test ( check protective relay ensure good grounding )
- check calibration to ensure working as the best
- check all main connection cables
- infra-red check look for hot spots, loose connection damage porcelains
- check fire control ( make sure it operates correctly ).
- bushing cleaning (if the bushing have been covered in protective grease, clean and replace if in heavy polluted area the treatment by poweder blast cleaning ).
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