Method for evaluating delivery test of hollow composite insulator

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...

AI Technical Summary

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

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