Composite insulators aging

    Composite Insulators are made of organic materials, the aging rate of the organic material much faster than ceramics and other inorganic materials. Although the composite insulator having excellent antifouling performance, however, a few years or ten years later, after radiation, temperature and humidity cycling effects and surface effects, such as pollution caused by the discharge of ultraviolet rays, so that the gradual aging of the insulator, its antifouling performance It will decline. So anti-aging properties of composite insulators is of great concern to the user.

    Survey shows that aging is the primary cause of failure of composite insulators, and mechanical and electrical and other reasons accounted for only 36 percent of non-aging failure. In polluted run for several months, with the natural aging process of pollution, it began to produce cumulative effects. Because of fog or dew moisture cause voltage brings uneven, leading to creeping discharge. At night by the image intensifier observation of transmission lines that, in wet conditions, the actual occurrence of each line are creeping discharge. After a long run, ultraviolet and creeping discharge caused by deterioration. With the beginning of the deterioration of surface discoloration, silty and cracks appear. These changes increase the roughness of the surface, resulting in the waste accumulation rates. The next corona and surface discharges may cause corrosion, cracking or puncture umbrella group. Operating experience shows that, under normal operating conditions, even if they are badly corroded silicone rubber insulator flashover does not occur, however, further corrosion or small arc discharge, water will infiltrate or glass fiber core rod is exposed to the air, resulting in the loss of the mandrel and sheds cross interface. Thus, after a long-running composite insulators, it will not guarantee its service life. If the deterioration is slow, a good insulator will run for a long period of time, in most areas alike. However, near the seaside or industrial areas, the deterioration will accelerate, insulator failure will occur in just a few years later. Surveys show that some insulators 18 to 20 years can run well, while others only a few months even insulator that is failure.