The Key to Improving Transformer Life and Improving Power Supply Reliability

The insulation of a power transformer is an insulation system consisting of a transformer insulated corrugated paper tube. It is the basic condition for the normal operation and operation of the transformer. The service life of a transformer 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 a well-maintained transformer can have a real life of 50-70 years. According to the design requirements and technical indicators of the manufacturer, the life expectancy of the transformer is generally set at 20 to 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. Preventive and predictive maintenance is the key to improving transformer life and improving power supply reliability.