Selection of insulating materials:
Oil-immersed insulation: The transformer mainly adopts oil-immersed insulation method, which can ensure the normal operation of the transformer under high voltage conditions and has good moisture resistance, cooling, impact and arc extinguishing performance. The selection of insulating oil should take into account its compressive strength, heat resistance and stability to ensure the long-term safe operation of the transformer.
Dry insulation: Dry insulation methods include dry transformers, dry capacitors and dry mutual inductors, etc. Its advantages are not easy to be affected by moisture, not easy to catch fire, and easy to maintain. However, dry insulation usually cannot withstand very high voltage.
Gas insulation: Gas insulation methods include SF6 gas insulation and N2 gas insulation. This insulation method has low dielectric constant and good arc extinguishing performance, but it is expensive and has the disadvantage of not being able to remove gas in time.
Design of insulation structure:
Insulation coating: The surface of the transformer insulation parts is coated. Commonly used coatings include insulating paint, insulating oil, etc. These coatings are not easy to conduct electricity, high temperature resistance, wear resistance, can effectively block the flow of current, and play a role in protecting insulating parts.
Silicone rubber insulating sleeve: The insulating sleeve is put on the insulating part of the transformer. The silicone rubber material has the characteristics of high temperature resistance, corrosion resistance, and strong softness, which can effectively improve the insulation performance.
Insulating cover: Cover the insulating part of the transformer with an insulating cover, which is usually made of glass cloth, epoxy resin and other materials, and can effectively protect the insulating parts of the transformer.
Insulating cover: Wrap the insulating part of the transformer to form a protective layer, which is usually made of insulating paper, polyester film and other materials, and has good insulation performance and durability.
How to ensure the reliability of insulation
Correct selection of insulating materials:
Select appropriate insulating materials according to the use environment and working conditions, such as oil-immersed insulation and dry insulation materials.
Understand the quality and performance of the insulating material to ensure that it meets the expected withstand voltage and heat resistance.
Strengthen maintenance:
Check the quality of transformer oil regularly and replace the transformer oil regularly to ensure the insulation performance of the oil.
Clean the surface of the transformer, insulator and terminal regularly to prevent dust and foreign matter from affecting the insulation performance.
Regularly conduct insulating oil quality inspection and insulation loss test, and deal with problems found in time.
Installation and operation specifications:
Ensure that insulation treatment measures such as insulation coating, insulation sleeve, insulation cover, insulation cover, etc. are evenly covered on the surface of the transformer insulation parts, and the surface is flat, free of bubbles and cracks.
Pay attention to the use environment of the insulation parts to avoid the influence of external factors such as moisture and dust on the insulation performance.
Temperature monitoring and protection:
Install a temperature monitoring device to monitor the temperature of the transformer in real time to prevent the aging of the insulation material and the decline of insulation performance due to excessive temperature.
Lightning protection and overvoltage protection:
Take appropriate lightning protection measures and overvoltage protection devices to reduce the impact of lightning strikes and overvoltage on the transformer insulation system.
Through the comprehensive application of the above measures, the reliability of the High Voltage Transformer insulation can be ensured, thereby ensuring the safe and stable operation of the transformer.
