Insulation Materials An Endless Stream
Insulation material is one of the most important materials in the transformer, Insulation Materials its performance and quality directly affect the reliability of transformer operation and transformer life. In recent years, the transformer products used in the new insulating material after another.
With the rapid development of science and technology, Insulation Materials electrical appliances, transformers and other electrical equipment is increasingly widely used. The reliability and service life of the transformer are largely dependent on the insulation material used. Insulation materials are increasingly engaged in the design and manufacture of transformers.
Insulation material, also known as dielectric, is a high resistivity, low conductivity of the material. Insulation material can be used to isolate live or different potential of the conductor, so that the current flow in a certain direction. In the transformer products, insulation materials also play a cooling, cooling, support, Insulation Materials fixed, arc, improve the potential gradient, moisture, mildew and protective conductor and so on.
Transformer insulation material heat resistance grade refers to the insulation material in the transformer to allow the maximum temperature. If the correct use of insulating materials, Insulation Materials you can guarantee the material 20 years of service life. Otherwise it will be based on 8 ℃ law (A-class insulation temperature for each rise of 8 ℃, half of life, B-class insulation is 10 ℃, H level is 12 ℃. This law is known as the heat aging 8 ℃ law) Service life. The heat resistance of the insulating material composed of the polymer is lower than that of the inorganic dielectric. The properties of insulating materials are closely related to their molecular composition and molecular structure.
The concept of insulation resistance Insulation material resistance refers to the insulation material in the role of DC voltage, the pressure is longer, Insulation Materials and the line on the charging current and absorption current disappears, only the leakage current through the resistance value / generally specified as the voltage Plus a minute later, the measured resistance value is the insulation resistance value. For high-voltage large-capacity transformers, the insulation resistance is specified for 10 minutes.
In the course of the operation of electrical equipment due to a variety of factors due to long-term, insulation materials, a series of irreversible chemical and physical changes, Insulation Materials resulting in electrical and mechanical properties of the deterioration, this irreversible change is often referred to as aging. Insulation aging is divided into thermal aging, environmental aging and electrical aging. Factors that cause aging are heat, Insulation Materials electricity, light, oxygen, radiation and microbes.
In electrical equipment, the insulating material in the role of the electric field, Insulation Materials the performance of irreversible changes until the failure, the process known as electrical aging. The main reason for the aging of insulating materials is partial discharge. As the partial discharge of ozone, Insulation Materials ozone is a strong oxidant, so that the double bond with the macromolecules from the addition reaction, the material ozone cracking.