Maintenance methods for oil-immersed power transformers?
Time：2025-02-19 Auther：ZTelec-www.ztelectransformer.com
As an important equipment in the power system, the stable operation of oil-immersed power transformers is crucial to ensure the reliability and safety of power supply. In order to ensure the long-term and efficient operation of oil-immersed power transformers, a series of scientific and systematic maintenance measures must be taken.
Maintenance measures
Appearance inspection: Regularly conduct appearance inspections to check the sealing of the equipment and the wear of mechanical parts. Repair or replace damaged parts in time to ensure the normal operation of the equipment.
Cleaning equipment: Regularly clean the dust and dirt around the equipment to keep the equipment clean. This helps to improve the heat dissipation effect of the equipment and extend its service life.
Check the grounding system: Regularly check the grounding wire and grounding system of the equipment to ensure good grounding effect. This can reduce the risk of equipment being struck by lightning and ensure the safety of personnel and equipment.
Calibrate the protection device: Regularly check and calibrate the protection device of the equipment to ensure its normal operation. This can cut off the power supply in time when the equipment fails to prevent the failure from expanding.
Oil change and drying treatment: If the transformer is idle for too long, runs for too long, or is affected by other natural or human factors, it may cause the transformer insulation to decline, water to enter the interior, or the oil quality to deteriorate. At this time, the transformer must be oil changed and dried. When changing the oil, the transformer body should be lifted out first, the dirty oil should be drained, and the oil tank should be cleaned; when drying, zero-phase sequence drying method, eddy current drying method, short-circuit drying method, or oven drying method can be used. Only after the test is qualified can it be put into operation.
Temperature monitoring: Real-time monitoring of transformer temperature, especially oil temperature and winding temperature, to ensure operation within the normal range and avoid damage caused by overheating.
Oil quality testing: Regularly monitor oil quality, including indicators such as electrical properties, physical properties and chemical properties of the oil. Testing methods include chromatography, dissolved gas analysis and dielectric strength measurement. Through oil quality monitoring, we can understand the degree of oil aging and determine whether the equipment is faulty.
Clean insulators and coolers: Clean the transformers external insulators and coolers regularly to ensure good ventilation and heat dissipation, and avoid failures caused by dust and dirt accumulation.
Insulation resistance test: Perform insulation resistance tests regularly to assess the health of the insulation system. When the resistance is lower than the specified standard, there may be problems such as insulation aging or moisture intrusion.
Comprehensive gas analysis: Perform a comprehensive analysis of the gas in the transformer oil regularly to detect problems such as insulation material aging, partial discharge, and internal faults.
Fastener inspection: Regularly check the transformers fasteners, such as bolts and nuts, to ensure that they are in good condition and prevent failures caused by vibration and looseness.
Maintain insulation coating: Regularly check and maintain the transformers insulation coating to maintain its integrity and insulation performance.
The maintenance of oil-immersed power transformers is a complex and meticulous process that requires comprehensive consideration of multiple aspects. By taking the above measures, the long-term and efficient operation of oil-immersed power transformers can be ensured, and the stability and safety of the power system can be improved. At the same time, continuously pay attention to learning new technologies and new methods to adapt to the changing power demand and equipment conditions.
