Electrical Insulation Paper for Different Purposes Has Its Own Special Requirements
Electrical insulating paper and paperboard have certain physical performance requirements such as thickness, tightness, strength, elongation and tear. As insulating paper, there are additional characteristics index requirements, such as electrical insulation strength, power frequency or DC breakdown voltage, dielectric loss, etc.; as well as chemical indicators such as ash, water extract conductivity and metal ions. Electrical insulation paper for different purposes has its own special requirements.
Insulating paper fiber material is the most important insulation component material in oil-immersed transformers. Insulating crepe paper fibers are the basic solid tissue components of plants. The atoms that make up the material molecule have positively charged nuclei and negatively charged electrons that run around the nuclei. Unlike metal conductors, there is almost no free electrons in the insulating material, and the extremely small electrically conductive current in the insulator mainly comes from the ion conductance. Cellulose consists of carbon, hydrogen and oxygen, so that due to the presence of hydroxide in the molecular structure of the cellulose, there is a potential for water formation, giving the paper fibers water-containing properties.
The flammability of an insulating material refers to the ability of an insulating material to resist combustion when it contacts a flame or when it leaves the flame. As the application of insulating materials is expanding, the requirements for its resistance to combustion are more important, and various methods are used to improve and improve the flame resistance of insulating materials. The higher the resistance to combustion, the better its safety.