As a fundamental component of the power system, the operating status of power equipment directly affects the safety and quality of power supply. Routine maintenance is not simply surface cleaning, but rather a systematic and standardized process of inspection, maintenance, and monitoring to promptly identify and eliminate potential hazards, ensuring reliable operation within the design performance range. Scientific routine maintenance can significantly reduce the probability of sudden failures, extend the service life of equipment, and reduce losses from unplanned outages, playing a crucial role in ensuring the stable operation of the power grid.
The primary aspect of routine maintenance is periodic inspection and visual examination. Inspection cycles should be established according to equipment category and importance. For equipment such as transformers, circuit breakers, instrument transformers, switchgear, and cable terminals, the focus should be on checking for oil stains and leaks, damaged insulation, discoloration or corrosion of joints, unusual odors, and abnormal noises. For outdoor equipment, attention should be paid to foundation settlement, structural deformation, icing and snow accumulation, and dirt buildup. For indoor equipment, temperature and humidity, ventilation, and fire protection facilities should be checked for proper functioning. Inspections must be meticulously documented to create a traceable record for trend analysis and preventative measures.
Cleaning and contamination prevention are crucial aspects of routine maintenance. Dust, salt, or industrial contaminants adhering to insulation surfaces can reduce creepage distances and induce partial discharge. Regular cleaning with dry compressed air or a soft cloth is essential, using specialized cleaning agents when necessary. For heavily contaminated insulators and bushings, periodic live or de-energized water flushing can be performed. Flushing must be done with controlled water pressure and angle to avoid damaging the glaze or sealing structure. Metal components should have their anti-corrosion coating integrity checked; any peeling should be promptly repaired or replaced to prevent corrosion from spreading and affecting mechanical strength and conductivity.
Maintenance of connection points is particularly critical. Electrical connection points on busbars, cable joints, circuit breakers, and disconnectors are prone to increased contact resistance due to thermal expansion and contraction and oxidation during long-term operation. Regularly check fastener torque, remove oxide layers, and apply conductive grease to ensure good contact and normal temperature rise. For oil- or gas-filled equipment, observe the oil level, oil pressure, or gas pressure indicators. If any abnormalities are found, promptly investigate and address the cause to prevent a decline in insulation and arc-extinguishing performance. Cooling systems such as oil pumps, fans, and radiators should be checked for stable operation and cleanliness of filters to ensure effective heat dissipation.
Condition monitoring and data comparison should be incorporated into routine maintenance. Infrared thermometers should be used to detect hot spots at joints and conductors, and partial discharge detectors should be used to capture insulation degradation signals. Combined with oil chromatography analysis, potential internal problems in transformers can be identified, allowing for intervention at the initial stage of a fault. For equipment equipped with online monitoring systems, data curves should be checked daily or at a set frequency. If a trend deviating from the baseline value is detected, the cause should be analyzed promptly, and retesting or repair actions should be taken.
Lubrication and maintenance of mechanical components are crucial. For circuit breaker mechanisms, disconnector operating mechanisms, and cooling device transmission components with rotating parts, grease should be added or replaced according to the manufacturer's requirements to ensure smooth and unobstructed operation. Limit switches and auxiliary contacts should be checked for accurate positioning and reliable contact to prevent operational failures or protection malfunctions due to mechanical failure.
Routine maintenance also includes data and spare parts management. Equipment ledgers and maintenance records should be established, indicating each inspection, replacement of parts, and test results, providing a basis for lifespan assessment and replacement decisions. Commonly used spare parts such as seals, fuses, indicator lights, and fasteners should be kept in adequate stock to ensure rapid replacement when needed, minimizing power outage time.
In summary, routine maintenance of electrical equipment is a systematic task integrating visual inspection, cleaning and anti-fouling, connection maintenance, condition monitoring, mechanical maintenance, and data management. Only by implementing standardized procedures effectively and maintaining the professionalism and responsibility of personnel can potential defects be eliminated to the greatest extent possible, equipment be maintained in good working condition, and a solid guarantee be provided for the safe, stable, and economical operation of the power system.
