Transformer maintenance schedules are generally determined by the unit's type, operating environment, and load conditions, though standard patterns usually apply. Routine inspections are typically conducted daily or weekly; these focus on monitoring operating temperature, noise levels, and oil levels (for oil-immersed transformers), as well as checking for leaks, unusual odors, or abnormal vibrations-constituting the most fundamental level of operational monitoring.
Periodic maintenance is generally performed every three to six months. Key tasks include cleaning radiators and removing external dust, checking for loose terminals, and verifying the proper functioning of protection devices. For oil-immersed transformers, the color, odor, and moisture content of the transformer oil are also assessed to determine whether insulation performance has deteriorated.
Comprehensive overhauls are typically scheduled every one to three years, representing a higher level of maintenance. These procedures involve insulation resistance testing, winding DC resistance measurements, oil sample analysis, and tap-changer inspections. For transformers operating under sustained high loads or in harsh environments (such as those with high temperatures, heavy dust, or high humidity), the overhaul interval is shortened accordingly to ensure operational safety and stability.
