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Most of the transformer damage and failure are caused by the damage of the insulation system, What is the impact of the quality of insulating materials on the life of the transformer? What is the function of electrical crepe paper in oil-immersed transformer?
At present, the widely used power transformers are oil-immersed transformers and dry-type resin transformers. The insulation of power transformer is the insulation system composed of the insulating materials of transformer, which is the basic condition for the normal work and operation of transformer. The service life of the transformer is determined by the life of the insulating material (i.e. oil paper or resin, etc.). Practice has proved that most of the transformer damage and fault are caused by the damage of the insulation system. According to statistics, accidents caused by various types of insulation faults account for more than 85% of all transformer accidents.
The insulation materials of transformers in normal operation and maintenance management have a long service life. According to theoretical calculation and experimental research abroad, the theoretical life of small oil-immersed distribution transformer can reach 400 years when the actual temperature is kept at 95℃. The experience of design and field operation shows that the actual life of a well maintained transformer can reach 50 -- 70 years. According to the design requirements and technical indicators of the manufacturer, the expected life of the transformer is generally set as 20 to 40 years.
In oil-immersed transformers, electrical insulation crepe paper can be used for: (1) the main insulation separator. (2) inter-layer insulation when foil or plate conductors are used (uninsulated). (3) Lead insulation for low and/or high voltage leads
Black semiconductor crepe paper, high voltage crepe paper, transformer special crepe paper are all insulation crepe paper. The electrical crepe paper is made of insulating kraft paper as the base material by wrinkling processing.
Insulation paper tube, oil duct strip, pad, interphase partition, yoke insulation, pad insulation, support insulation and corner ring can be used as main insulation for insulating crepe paper. This kind of crepe paper is characterized by large tightness, uniform thickness, smooth surface, high mechanical strength, strong toughness and electrical insulation. The main uses are: motor, transformer, winding tube, gasket, capacitor and composite materials.
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 transformers, the main insulating materials are insulating oil and solid insulating materials insulating paper, such as crepe paper or crepe paper tubes, paperboard and wood blocks. The so-called aging of transformer insulation is the decomposition of these materials under the influence of environmental factors, reducing or losing the insulation strength.
