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Detection method for ageing degree of silicone rubber composite insulator

A technology of composite insulator and aging degree, which is applied in the field of power equipment, can solve the problems of inability to explain the aging of insulators, and cannot reflect the polarity change of the insulator surface, and achieve the effect of simple operation

Inactive Publication Date: 2013-10-09
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

[0006] At present, the method of detecting the surface free energy of composite insulators is to directly use water to measure the contact angle of the insulator surface. This test method has the following defects: (1) When the detection liquid is water, it can only reflect the change of non-polarity on the surface of the insulator process, and does not reflect polarity changes on the surface of the insulator
(2) Only measuring the contact angle value of water does not explain the aging of insulators

Method used

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  • Detection method for ageing degree of silicone rubber composite insulator
  • Detection method for ageing degree of silicone rubber composite insulator
  • Detection method for ageing degree of silicone rubber composite insulator

Examples

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Embodiment 1

[0030] Example 1 Detection method of aging degree of silicone rubber composite insulator

[0031] A method for detecting the aging degree of a silicone rubber composite insulator, comprising the following steps:

[0032] (1) Randomly select 9 parts of unused silicone rubber composite insulators, and irradiate 0h, 48h, 96h, 144h, 192h, 240h, 480h, 720h under the ultraviolet radiation of UV-A with a center wavelength of 340nm , 880h;

[0033] (2) Cut a small piece from the high-voltage side shed of each silicone rubber composite insulator in step (1) as a test sample, and cut out a piece of the upper surface that is not less than 4cm×4cm. Uniform thickness does not affect the shooting effect of projection;

[0034] (3) Place the test sample in the test area of ​​the GBX contact angle meter, select the free energy test mode, adjust the focus of the sample, and adjust the focus of the test sample. It is observed that the needle is rectangular, and the droplet appears until the ...

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Abstract

The invention discloses a detection method for the ageing degree of a silicone rubber composite insulator. According to the invention, a plurality of detection liquids are used to determine the contact angle of the silicone rubber composite insulator and calculating surface free energy and acid-alkali components thereof, and the ageing degree of the silicone rubber composite insulator is judged according to the value of the surface free energy; the ageing degree is grade I if the surface free energy is in a range of 12 mJ / m<2> to 26 mJ / m<2>, the ageing degree is grade II if the surface free energy is in a range of 26 mJ / m<2> to 28 mJ / m<2>, and the ageing degree is grade III if the surface free energy no less than 28 mJ / m<2>. The detection method is simple to operate, can reflect changing process of the surface of the silicone rubber insulator in a plurality of aspects and is applicable to assessment of ageing of the composite insulator.

Description

technical field [0001] The invention relates to the field of electric equipment, in particular to a method for detecting the aging degree of a silicone rubber composite insulator. Background technique [0002] The phenomenon of surface wetting is complex and affected by many different parameters, some important parameters include: insulator material surface roughness, surface inhomogeneity, chemical composition and adhesion of dirt. Due to the influence of surrounding conditions, the wettability of some commonly used materials for insulators will change over time. [0003] Surface free energy is the energy required for a condensed phase to produce a free surface per unit area, and it is a direct manifestation of intermolecular forces. When the surface structure of composite insulators changes, foreign atoms are adsorbed on the surface, or various defects exist on the surface, the surface free energy will change obviously. For solids, in the theory of solid physics, surface...

Claims

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Application Information

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IPC IPC(8): G01N13/00
Inventor 许志海徐晓刚彭向阳麦晓明毛先胤方鹏飞王建国王聪刘杨王康
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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