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What is the name of the insulating paper in the transformer?
In the power system, the transformer is a key device for power conversion and transmission, and the stability and safety of its internal structure are crucial. The selection and application of insulating materials are essential to ensure that the transformer can work continuously and reliably in a complex and changeable operating environment. Among them, insulating paper plays a vital role as an indispensable insulating element inside the transformer. So, what are the names and types of insulating paper used in transformers? This article will explore this issue in detail.
- Basic concept of insulating paper
Insulating paper, as the name suggests, refers to paper materials with excellent insulating properties. In transformers, insulating paper is mainly used to isolate live parts, prevent electrical short circuits or breakdowns, and withstand mechanical stress and vibration to ensure the stable operation of transformers. There are many types of insulating paper, and each type of paper has its unique physical, and chemical properties and application scenarios.
- Main types of insulating paper in transformers
- Insulating paperboard
Insulating paperboard is one of the most widely used insulating materials in transformers. It is made of kraft wood pulp and has good insulating properties and mechanical strength. Insulating paperboard is mainly used to wrap wires and windings, isolating them from the transformer casing or other live parts to prevent electrical faults. At the same time, insulating paperboard can also be used as a supporting and fixing material to support and fix windings, leads, and other components to ensure the overall structural stability of the transformer.
- Denison paper (modified insulating paper)
Denison paper, also known as nitrile paper, is a modified insulating paper to which chemicals such as dinitrile amine and vinyl cyanide are added during the manufacturing process. Produced by Denison Corporation of the United States, this paper has excellent mechanical strength and appropriate elongation and is an ideal material for insulation of large transformer winding turns. After wrinkling and calendering, Denison paper can tightly wrap the transposed conductors, prevent the occurrence of bulging, and improve the insulation performance of the transformer.
- Insulating corrugated paper
Insulating corrugated paper is a special paper made by corrugating insulating paper for electrical workers. It has wrinkles in the horizontal direction, and the wrinkles are pulled apart when stretched and can be made into corrugated paper with different elongations. Insulating corrugated paper is mainly used for wrapping wires and cables, as well as for interlayer insulation of electromagnetic wires inside transformers, to improve the flexibility and adaptability of the insulation layer.
- Corrugated insulation paper
Corrugated insulation paper is made of corrugated insulation paper for electrical workers, which has folds in the horizontal direction and opens when stretched. This paper can be made into corrugated paper with different elongations according to different corrugation processing procedures to meet different insulation needs. Corrugated insulation paper is often used for winding insulation of oil-immersed transformers, such as the winding head part. Its good insulation performance and mechanical strength provide a reliable insulation barrier for the transformer.
- Nomex paper
Nomex paper is a heat-resistant synthetic fiber paper produced by DuPont in the United States. Its main component is aromatic polyamide. Nomex paper has good thermal aging and high-temperature resistance, can be used for a long time at 220℃, and belongs to Class C insulation material. It is widely used in power, aerospace, and other fields, especially in occasions where high-temperature insulation is required, such as dry-type transformers and motors.
- Selection and application of insulating paper
In transformers, the selection of insulating paper should be based on the specific use environment and needs. For example, for transformers in high temperature and high humidity environments, insulating paper with good heat resistance and moisture resistance should be selected; for parts that need to withstand greater mechanical stress, insulating paper with higher mechanical strength should be selected. At the same time, parameters such as the thickness and elongation of the insulating paper should also be adjusted according to actual needs to ensure the reliability and stability of the insulation layer.
- Conclusion
In summary, there are many types of insulating paper used in transformers, including insulating cardboard, Denison paper, insulating crepe paper, corrugated insulating paper, and Nomex paper. Each type of insulating paper has its unique physical and chemical properties and application scenarios. In the design and manufacturing process of the transformer, the appropriate insulating paper material should be selected according to the specific use environment and needs to ensure the safe and stable operation of the transformer. By continuously optimizing the selection and application technology of insulating paper, the insulation performance and reliability of the transformer can be further improved, providing a strong guarantee for the stable operation of the power system.
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