Transformers use insulation materials and transformers service life

             At present, the most widely used power transformers are oil-immersed transformers and dry-type resin transformers. The insulation of power transformers is the insulation system composed of transformer insulation materials. It is t……

 

          

At present, the most widely used power transformers are oil-immersed transformers and dry-type resin transformers. The insulation of power transformers is the insulation system composed of transformer insulation materials. It is the basic condition for the normal work and operation of transformers. The service life of transformers is determined by the life of the insulating material (ie oil paper or resin, etc.). Practice has proved that most transformer damage and failure are caused by damage to the insulation system. According to statistics, accidents caused by various types of insulation faults account for more than 85% of all transformer accidents. For transformers that operate normally and pay attention to maintenance management, the insulation material has a long service life.

According to theoretical calculations and experimental studies abroad, when the actual temperature of a small oil-immersed distribution transformer continues at 95 °C, the theoretical life expectancy will reach 400 years. Experience in design and field operation shows that the actual life of a well-maintained transformer can reach 50-70 years: according to the design requirements and technical specifications of the manufacturer, the life expectancy of the transformer is generally set at 20-40 years. Therefore, protecting the normal operation of the transformer and enhancing the reasonable maintenance of the insulation system can largely ensure that the transformer has a relatively long service life, and preventive and predictive maintenance are the key to improving the service life of the transformer and improving the reliability of the power supply. In oil-immersed transformers, the main insulating materials are insulating oil and solid insulating materials, insulating paper, cardboard and wood blocks. The so-called transformer insulation aging is that these materials are decomposed by environmental factors, reducing or losing the insulation strength.

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