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Method for evaluating delivery test of hollow composite insulator

A composite insulator, factory test technology, applied in the direction of using a stable bending force to test the strength of the material, using a stable tension/pressure test to test the strength of the material, measuring devices, etc. , It is not enough to effectively assess the performance of the connection interface of hollow composite insulators, so as to achieve the effect of improving the assessment level.

Inactive Publication Date: 2017-08-04
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology

However, the assembly technology of faulty hollow composite insulators is complicated, and mechanical failures still occur in complex operating environments, which shows that the factory test items of hollow composite insulators specified in the existing standards are not enough to effectively evaluate the connection of hollow composite insulators in the form of interference fit assembly interface performance

Method used

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  • Method for evaluating delivery test of hollow composite insulator

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Embodiment

[0029] Please refer to figure 1 , a hollow composite insulator delivery test evaluation method, which includes:

[0030] Step 1. Carry out a visual inspection of the hollow composite insulator, check whether the installation of the metal parts of the insulator is in compliance with the drawing, whether the color of the insulator is close to the color specified in the drawing, and check whether there are cracks at the root of the umbrella near the metal accessories and whether there are any cracks on the surface of the umbrella cover that exceed 1mm molded flash; if the visual inspection is qualified, go to step 2.

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Abstract

The invention discloses a method for evaluating a delivery test of a hollow composite insulator. The method comprises the steps of (1) carrying out appearance inspection on the hollow composite insulator; (2) carrying out internal pressure test on the hollow composite insulator; (3) carrying out 1fold maximum mechanical load bending test on the hollow composite insulator; (4) carrying out 1.5fold maximum mechanical load bending test on the hollow composite insulator; (5) carrying out internal pressure test on the hollow composite insulator again; and (6) carrying out water diffusion test on a material for manufacturing the hollow composite insulator. The 1.5fold maximum mechanical load bending test and repeated 2.0fold maximum operating pressure test are added, the 2fold maximum operating internal pressure test, 1.0fold maximum mechanical load bending test, 1.5fold maximum mechanical load bending test and repeated 2.0fold maximum operating internal pressure test are executed in sequence, and the combination test sequence is optimized, and therefore the mechanical property of the hollow composite insulator is examined to the greatest extent.

Description

technical field [0001] The invention relates to the field of insulator equipment manufacturing test detection, in particular to a hollow composite insulator delivery test evaluation method. Background technique [0002] From 2016 to 2017, two 500kV DC wall bushing SF6 gas leakage failures occurred in the XX DC project of a power grid company, but the faulty bushings were only put into operation for 2 to 3 years. Moreover, the air leakage locations are all located at the joints between the root flange of the casing hollow composite insulator on the outdoor side and the glass fiber reinforced plastic cylinder. After dismantling and inspection, it was found that the relative displacement of the flange and the glass fiber reinforced plastic cylinder was the direct cause of the SF6 leakage of the wall bushing. Further research shows that the hollow composite insulator with wall bushing adopts the flange assembly form of interference fit. [0003] The interference fit technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12G01N3/20
CPCG01N3/12G01N3/20G01N2203/0023G01N2203/0042G01N2203/0676
Inventor 韦晓星张晋寅楚金伟孙勇
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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