Routine maintenance of transformer accessories focuses primarily on the regular inspection and care of sealed oil-storage components to prevent leaks and moisture-related faults at the source. Daily inspections must prioritize checking that the oil level in the conservator falls within the standard range and that the oil level gauge provides a clear, accurate reading; any abnormally high or low levels require immediate investigation. Simultaneously, seals, gaskets, and oil seal interfaces across the equipment must be carefully examined for signs of aging, hardening, or oil seepage and leakage; minor seepage points should be tightened promptly, and aged components replaced proactively. The condition of the silica gel in the breather must be monitored regularly; it should be replaced immediately upon discoloration due to moisture or clumping to ensure balanced internal and external air pressure, prevent the ingress of water vapor and impurities, and avoid the degradation of insulating oil.
Routine maintenance of heat dissipation and cooling accessories is crucial for preventing high-temperature overloading and ensuring the transformer's long-term, reliable operation. Operations and maintenance personnel must regularly clean dust, oil stains, and debris from the surfaces of radiators and cooling pipes to keep heat dissipation channels clear and prevent debris accumulation from impairing cooling efficiency. Rotating components-such as cooling fans and blowers-require frequent operational checks to ensure smooth rotation and the absence of abnormal noises or sticking; bearings must be lubricated regularly, and damaged parts repaired or replaced promptly. Before seasonal changes or peak load periods, the entire cooling system requires a comprehensive inspection to verify the functionality of both natural and forced cooling, effectively control the transformer's operating temperature, and prevent high heat from accelerating the aging of insulation components.
Maintenance of safety protection and electrical connection accessories centers on regular calibration, hazard identification, and ensuring reliable performance. Daily checks should cover the operational status of protection components-such as temperature controllers, temperature probes, pressure relief valves, and gas relays-to ensure accurate parameter display and responsive operation, free from sticking or malfunction. Functional calibration must be performed regularly in accordance with power system maintenance standards to guarantee that protection devices actuate promptly and trigger accurate alarms in the event of overloads, short circuits, or internal faults. At the same time, regularly inspect connection components such as high- and low-voltage bushings, terminals, and fastening bolts; clean dirt from bushing surfaces; and check connection points for looseness, overheating, or oxidation-induced discoloration. Promptly tighten loose connections and address oxidized areas to ensure stable circuit connections and eliminate safety hazards-such as overheating, current leakage, or circuit tripping-caused by poor contact.
