Manufacturing method of overhead line core rod decay defect composite insulator

Abstract

The invention discloses a manufacturing method of an overhead line core rod decay defect composite insulator. At present, a method for manually manufacturing a composite insulator core rod decay defect is characterized in that a voltage is applied to a core rod in a salt mist environment, and the core rod is rotten by erosion of a leakage current. According to the method, a voltage needs to be applied to a core rod for a long time, and safety risks exist; and in addition, the method needs a closed environment capable of generating salt mist, and the requirement for the environment is high. The technical scheme adopted by the invention is as follows: a shear load is applied to a core rod to generate slight damage to a surface layer, then the surface of the core rod is combusted with fire to cause carbonization of the surface layer, then the combusted core rod is placed and soaked in an acid solution for a period of time, and then the core rod is subjected to silicone rubber sheath extrusion and umbrella penetration to form a composite insulator with a core rod decay defect. The method needs neither application of voltage nor a salt mist closed environment, the manufacture is simple and safe, and meanwhile, tests prove that the manufactured core rod decay defect can generate obvious 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 manufacturing method for composite insulators with mandrel decay defects in overhead lines, in particular to a method for imposing a decay generation environment on mandrels to generate decay defects on the mandrel surfaces. Background technique [0002] Overhead line composite insulators are used in a huge amount, and there have been many incidents of decay and string breakage and internal breakdown during operation, which bring risks to equipment and personal safety. The broken strings and internal breakdown of composite insulators are often the result of long-term development of composite insulator mandrel defects, which often generate heat under the operating voltage. Therefore, infrared detection is currently the main research direction for detecting defects. In order to improve the accuracy of on-site infrared detection and judgment of decay defects, a...

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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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