Insulators bear the effects of working voltage and various overvoltage during operation; Capable of withstanding the weight, self weight, ice weight, wind force, system short-circuit electrical force, equipment operation mechanical force and vibration force, etc; It also bears the effects of changes in atmospheric conditions and environmental pollution. Therefore, its working conditions are harsh.
The general faults and causes are as follows:
(1) Cracking. The reasons for cracking include: manufacturing defects on both the surface and inside of the ceramic parts; Flashover causes damage to porcelain components due to local overheating; The aging of the applied silicone gel results in leakage current and partial discharge; Porcelain surface glaze detachment; Cracks on the hem of the skirt; Tight fastening hardware causes significant stress on porcelain components; Damaged by external forces; Damage caused by poor coordination between the porcelain sleeve and internal equipment.
(2) Crawling marks. The reason is that the insulation surface has formed a pathway due to discharge carbonization, gradually leading to flashover grounding short circuit accidents.
(3) Oil leakage. The reason is that severe oil leakage such as cracking, misalignment, and aging of sealing materials can cause insulation breakdown of the casing and may also cause damage to the equipment.
(4) Corona. The reason is the discharge of the protruding parts on the terminal fittings, surface pollution along the insulation surface, cracking, and internal defects.
(5) Terminal overheating. Due to poor connectivity, overheating, discoloration, and shortened lifespan of insulation materials are caused.