Anti-brittle-fracture composite insulator and preparation method thereof

Abstract

The invention relates to an anti-brittle-fracture composite insulator. The insulator comprises an end accessory, a core rod, a coating layer and outer insulating silicone rubber umbrella sleeves; oneend of the core rod is a high-voltage end; the other end of the core rod is a grounding end; the coating layer coats the outer surface of the high-voltage end core rod; the outer surface of the core rod is provided with the outer insulating silicone rubber umbrella sleeves; and the outer insulating silicone rubber umbrella sleeves close to the high-voltage end are molded on the outer surface of the coating layer. According to the anti-brittle-fracture composite insulator, an ultrafine spherical alpha-Al2O3 material is utilized so as to successfully prepare novel nano alpha-Al2O3 ultrafine spherical silicone rubber with strong hydrophobicity, pollution flashover resistance and aging resistance; the hydrophobic contact angle of the nano alpha-Al2O3 ultrafine spherical silicone rubber is greater than or equal to 100 degrees; the hydrophobicity and aging resistance of the composite insulator are improved; and the situation that the interior of the insulator is easy to heat to cause breakage due to long-term use is avoided. The non-linear material added to the non-linear coating layer can effectively reduce the field intensity of the end part of the high-voltage end of the core rod of the composite insulator, and therefore, corona voltage can be improved, the generation of partial discharge on the surface of the core rod can be avoided, the electrical aging of the material of the umbrella sleeves is slowed down, and the brittle-fracture of the composite insulator is avoided.

Description

technical field [0001] The invention relates to the technical field of composite insulators, in particular to an anti-crack composite insulator and a preparation method thereof. Background technique [0002] In recent years, there have been many major safety accidents of composite insulator disconnection in the power grid. Anatomy and analysis of broken composite insulators have found a quality accident different from mandrel brittle fracture. Some scholars have proposed a special insulator deterioration called crisp fracture. The results show that the internal defects of the composite insulator lead to partial discharge heating, and the accelerated thermal aging caused by this is the main reason for the cracking and fracture of the mandrel after the long-term operation of the composite insulator. [0003] Through the anatomical study of the fractured composite insulator, it was found that the abnormal fracture characteristics of this new composite insulator include: [000...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide an anti-brittle composite insulator and its preparation method to solve the problem that the composite insulator in the prior art is easy to break due to local heat release caused by internal defects

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