Manufacturing method of composite insulator with rotten defect of mandrel for overhead line

Abstract

The invention discloses a manufacturing method of a composite insulator with rotten defect of a core rod of an overhead line. At present, the method of artificially producing the rotten defect of the composite insulator core rod is as follows: applying a voltage to the core rod in a salt spray environment, and causing the core rod to rot through the erosion of the leakage current; this method needs to apply a voltage to the core rod for a long time, and there are Safety risks; in addition, this method requires a closed environment that can generate salt mist, and has high environmental requirements. The technical scheme adopted in the present invention is as follows: applying shear load to the mandrel bar to cause slight damage to the surface layer, then burning the surface of the mandrel bar with fire to cause carbonization of the surface layer, then immersing the burned mandrel bar in an acid solution for a period of time, The mandrel is extruded and pierced with a silicone rubber sheath to form a composite insulator with the mandrel rotten defect. The invention does not need to apply voltage, does not need a salt spray airtight environment, is simple and safe to manufacture, and at the same time, experiments prove that the manufactured mandrel rotten defect can generate significant heat under the operating voltage.

Description

technical field [0001] The invention belongs to the field of composite insulators for overhead lines, and relates to a method for making a composite insulator with rotten defects of an overhead line mandrel, in particular to a method for applying a simulated rot generation environment to the core rod to generate rotten defects on the surface of the core rod. Background technique [0002] The amount of composite insulators used in overhead lines is huge, and there have been many occurrences of rotten and broken strings and internal breakdown events during operation, which bring risks to equipment and personal safety. The rotten string and internal breakdown of composite insulators are often the result of the long-term development of rotten defects in composite insulator mandrels, and rotten defects often generate heat under the operating voltage. Therefore, infrared detection is the main research direction for detecting rotten defects at present. In order to improve the accur...

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Problems solved by technology

[0003] At present, the method of producing composite insulator mandrel decay is to apply a voltage to a mandrel for a long time in a salt spray environment, and gradually cause the mandrel to decay through the erosion of leakage current; this method needs to apply voltage to the mandrel for a long time , there are safety risks. In addition, this method requires a closed environment that can generate salt spray, and has high environmental requirements, so the realization of this method is relatively difficult.

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