What is insulating material? What are the insulation materials? On this topic, Xiaobian made a detailed introduction for everyone today. The materials used in electrical equipment are used to isolate the charged body from other parts. Commonly used solid materials include insulating sleeves, insulating papers, laminates, rubbers, plastics, paints, glass, ceramics, and mica. Commonly used liquid materials are transformer oils. Air materials, nitrogen, sulfur hexafluoride, etc. are used more in gaseous materials. The society now uses more insulating materials. In applications and in industry and life, it is more common that “electrician’s tape,” “plastic,” and ceramics are all insulating materials.
A material composed of a material having a resistivity of 109 to 1022 Ω·Cm is called an insulating material in an electrotechnical technique, and is also referred to as a dielectric material. Simply put, it is a material that isolates the charged body from other parts. Insulation material has very great resistance to DC current. Under the action of DC voltage, except for the tiny surface leakage current, it is practically non-conductive. For AC current, there is a capacitive current, but it is also considered not to be. Conductive. The greater the resistivity of the insulating material, the better the insulation performance.
Insulation materials are indispensable materials in electrical products. For example, a 300MW turbine generator requires 10k of insulation paint, 8t of mica products, 5t of laminates, and 1t of lacquer and film; the insulation material of a 3200kW transformer accounts for 34% of its total mass; a 10kV high voltage Circuit breakers require 18% of their total insulation. According to the average installed capacity of China’s power generation equipment and its supporting electrical equipment, the average consumption of insulating materials is 65t/10MW, which shows that the proportion of insulating materials in electrical equipment is very large.
In general, motors and electrical equipment are composed of conductor materials, magnetic materials, insulation materials and structural materials. In addition to insulating materials, all other metal materials. In operation, motors and electrical appliances are inevitably subjected to various factors such as temperature, electrical and mechanical stresses and vibrations, harmful gases, chemical substances, moisture, dust, and irradiation. These factors have a more pronounced effect on insulating materials than on other materials. It can be said that insulating materials are more sensitive to these factors and are easily deteriorated and deteriorated, resulting in damage to electrical equipment. Therefore, insulating materials are the key materials that determine the reliability of motors and electrical appliances. With the continuation of the running time, the insulating material must age, and its aging rate is faster than other materials, so the key materials that determine the service life of the motor and the electrical appliance are also insulating materials.
Insulation materials are one of the key factors that determine the technical and economic indicators of motors and electrical appliances. One of the important technical and economical indicators of the motor is the mass-to-power ratio, ie kg/kw. Decreasing the ratio has important significance for the motor. According to reports, from 1900 to 1967, the mass of a 1hp (0.75kW) motor was reduced from 40kg to 10kg, and it has now been reduced to a level of 6kg/kW. An important reason for this change is the use of highly heat-resistant insulating materials. Reducing the kg/kW value can save a lot of metal materials and reduce motor costs. If an A-class (105 °C) motor is insulated with H-grade (180 °C), the volume can be reduced by 30% to 50%, saving 20% of copper, 30% to 50% of silicon steel, and 25% of cast iron. Of course, using the same type of machine and using a higher temperature resistant insulation material can increase power or extend the life of the motor. From the perspective of the cost of electrical and electronic products, the cost of insulating materials is about half, which explains the position and role of insulating materials in the electrical and electronic industries.
About insulation materials for everyone to introduce to this, I believe we pass the detailed introduction of this article, have a further understanding of the insulating material, if you have other questions, you can click on the online customer service to get in touch with you, our customer service staff will be dedicated to Your service!