Transformer Winding Paper

The insulating material is one of the most important materials in the transformer, its performance and quality directly affect the reliability of the transformer operation and the service life of the transformer. In recent years, new insulating materials used in transformer products have emerged in an endless stream. With the rapid development of science and technology, electrical equipment such as motors and transformers are widely used. However, the reliability and service life of transformer operation depend to a large extent on the insulating materials used. Insulation materials are more and more valued by those engaged in transformer design and manufacture. In the past two decades, new products, new technologies, and new theories of transformer insulation materials have emerged and developed continuously, so that transformer insulation materials and their applications have formed a very important discipline. Insulating materials, also known as dielectrics, are materials with high resistivity and low conductivity. Insulating materials can be used to isolate conductors that are charged or at different potentials, allowing current to flow in a certain direction. In transformer products, insulating materials also play a role in heat dissipation, cooling, support, fixing, arc extinguishing, improving potential gradient, moisture-proof, mildew-proof, and conductor protection. Insulation materials are classified according to the voltage level: generally divided into: Y (90°C), A (105), E (120°C), B (130°C), F (155°C), H (180°C), C (greater than 180°C ℃). The heat resistance grade of the transformer insulation material refers to the maximum temperature that the insulation material is allowed to withstand in the transformer. If the insulation is used correctly, it can guarantee a 20-year lifespan of the material. Otherwise, it will be based on the 8°C law (for every 8°C increase in the temperature of Class A insulation, the service life will be reduced by half, Class B insulation is 10°C, and Class H is 12°C. This law is called the 8°C law of thermal aging). service life. The heat resistance of insulating materials composed of high polymers is half lower than that of inorganic dielectrics. The properties of insulating materials are closely related to their molecular composition and molecular structure. There are many kinds of transformer insulating materials, which can be generally divided into gas insulating materials, liquid insulating materials and solid insulating materials according to their forms.

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