Stress corrosion method for protection of core rod used in composite insulator

A technology of composite insulators and stress corrosion, which is applied in the direction of surface coating liquid devices, coatings, special surfaces, etc., can solve the problems of large dispersion, poor stress corrosion resistance, no better, etc., and achieve enhanced stress resistance Corrosion performance, improvement of stress corrosion resistance, effect of improving stress corrosion resistance

Inactive Publication Date: 2005-09-21
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

E glass fiber epoxy resin core rod has excellent electrical properties and good mechanical strength, but its stress corrosion resistance is poor, and its dispersion is large, which is difficult to control
Hoechst CeramTec of Germany uses a kind of ECR ​​fiber instead of E glass fiber to make the mandrel, which has excellent stress corrosion resistance, but its electrical performance is not ideal
Some methods to improve the stress corrosion corrosion performance of the mandrel have also been proposed in China. Various modifiers are added in the production process for modification. The process is complicated and cumbersome, and it is only for the new production process.
As for the mandrel with poor stress corrosion resistance, how to improve it, there is no better way at present

Method used

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  • Stress corrosion method for protection of core rod used in composite insulator
  • Stress corrosion method for protection of core rod used in composite insulator
  • Stress corrosion method for protection of core rod used in composite insulator

Examples

Experimental program
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Embodiment 1

[0020] In this embodiment, in order to improve the stress corrosion performance of a mandrel with a diameter of φ18mm, a coating composed of epoxy resin and glass flakes is selected. When coating the mandrel surface, a two-component coating is used. The A component is an epoxy flake coating, and the B component is a curing agent, which is blended and mixed in a ratio of 5:1. Apply the paint directly on the mandrel with a brush, wait for a few hours to cure and dry, and then apply the second time. After the second brushing, the coating will reach a thickness of 0.1mm-0.2mm. After coating, the mandrel is maintained for one week.

[0021] The stress corrosion resistance performance of the scale-containing coating mandrel produced in this embodiment was tested. During the test, according to the corresponding regulations in the electric power industry standard DL / T 810-2002, 67% of the rated load of 67kN (rated load 100kN) was applied to the original mandrel and the mandrel coated...

Embodiment 2

[0026] In this embodiment, the stress corrosion performance of the mandrel with a diameter of φ18 mm is also improved, and the high-chlorinated polyethylene glass flake coating composed of high-chlorinated polyethylene resin and glass flakes is selected. Use one-component paint, cover the surface of the core rod with a layer of coating according to the spraying method, and after the coating thickness sprayed on the surface of the core rod reaches 0.15mm, then carry out the stress corrosion test on the core rod containing scale paint according to the above test method , the test results are shown in Table 2. It can be seen from the table that the stress corrosion resistance of the mandrel is greatly improved.

[0027] Spraying times

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Abstract

The invention relates to a method for preventing stress corrosion of the composite insulator plug, which belongs to the high-pressure transmission fields. The method coats the scaly paint on the composite insulator plug through brushing, spouting or immersing to form the cocooning on the surface of the plug. The invention does not change the original electric and mechanical property of the plug and improves the corrosion resistance of the plug violently, by which can get a composite insulator plug with excellent combination property of electric property and corrosion resistance, besides, the method can improve the plug with bad corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of high-voltage power transmission, and particularly relates to a method for protecting composite insulators from mandrel stress corrosion. Background technique [0002] In high-voltage transmission lines, composite insulators have been widely used in the field of high-voltage external insulation of power systems in the past decade because of their good pollution flashover resistance, high specific strength, no zero value, and convenient operation and maintenance. Its basic structure is a composite structure of a fiberglass mandrel set with an organic material umbrella cover, and metal fittings at both ends. Among them, the FRP mandrel is used as the inner insulating part and the carrier of mechanical load, and its electrical and mechanical properties are directly related to the operation reliability of the composite insulator. [0003] FRP core rods used for high-voltage composite insulators are generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00
Inventor 梁曦东戴建军
Owner TSINGHUA UNIV
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