If the insulation material is different according to the physical state

Different insulation boards correspond to different uses and play different roles. For example, the role of motor insulation materials is to isolate different parts of conductors in electrical equipment, so that the current can flow in a predetermined direction.

Insulation materials can be divided into three categories: gas, liquid and solid if they are in different physical states. Gas insulation materials refer to air, nitrogen, carbon dioxide, sulfur hexafluoride, etc. The liquid insulation materials are mineral oil such as transformer oil, capacitor oil and cable oil, and synthetic oil such as silicone oil and three-atmosphere biphenyl. Relatively speaking, the classification of solid motor insulation materials is more complex.

At present, there are many commonly used motor insulation materials, one is impregnated paint, it can be divided into solvent and solvent-free two kinds, the former permeability is better, storage time is long, easy to use, but impregnation and drying time is long, slow curing; And the latter curing fast, viscosity changes rapidly with temperature, and fluidity, permeability, insulation integrity are very good.

Similar to the motor insulation material is coating paint, which can not only be used for coating the surface of the coil and insulated parts after dipping, but also can be used for motor repair, to strengthen the local insulation capacity. At present, epoxy coating is more widely used because of its moisture resistance, mildew resistance, internal drying and strong adhesion to the film.

In addition, composite insulating materials are also very common motor insulating materials, including DMD, NMN, NHN, green shell paper, dupont paper, motor film and other composite insulating materials, this kind of motor insulation material has high heat resistance, low water absorption, soft, high tensile strength, good electrical performance and so on. It can be used for slot insulation, interturn and interlayer insulation, gasket insulation, transformer insulation and other electrical insulation of small and medium-sized motors.

The life expectancy of transformers is generally set at 20140 years. Therefore, to protect the normal operation of the transformer and strengthen the reasonable maintenance of the insulation system, to a large extent, can ensure that the transformer has a relatively long service life, and preventive and predictive maintenance is the key to improve the service life of the transformer and improve the reliability of power supply. In oil-immersed transformer, the main insulating materials are insulating oil and solid insulating materials insulating paper, cardboard and wood blocks, etc. c The so-called aging of transformer insulation is that these materials are affected by environmental factors decomposition, reduce or lose the insulation strength.