Composite insulator interface flaw detection method based on water diffusion and dissection method

Abstract

The invention provides a composite insulator interface flaw detection method based on a water diffusion and dissection method. The method comprises the steps: (1) intercepting a plurality of samples, and recording obvious aging phenomenon on each sample before the samples are intercepted; (2) pre-aging each sample in a boiling way; (3) carrying out a pressure test on each sample, recording a leak current value and local abnormal temperature rising phenomenon; (4) dissecting each sample, pulling an umbrella skirt of each sample along the radial direction, and recording the residual amount of a silicone rubber material on the surface of a core bar of each sample; and (5) checking and accepting each sample according to an acceptance criterion according to the recorded result. By boiling the insulator with a jacket, the aging of the composite insulator interface is accelerated, so that early prediction on the insulator having the interface potential danger can be realized, the missing rate of the detection on the flaw of the interface can be greatly reduced, and the interface flaw of the composite insulator can be effectively detected. The method has advantages of being high in accuracy, easy to realize, low in cost and the like.

Description

technical field [0001] The invention relates to the technical field of detection of composite insulators, in particular to a method for detecting defects at the interface of composite insulators based on water diffusion and dissection. Background technique [0002] Composite insulators are insulators composed of glass fiber resin core rods, synthetic material sheaths, sheds and connecting fittings at both ends. Due to their light weight, high strength, strong pollution flashover resistance, and convenient manufacturing and maintenance widely used in power systems. In order to continuously improve the process of composite insulators and improve its quality, it is necessary to conduct appraisal experiments on various components of composite insulators to determine the optimal insulator design scheme and material combination. [0003] The standard IEC6227-2005 is the definition, test method and acceptance criteria of indoor and outdoor polymeric insulators with a nominal volta...

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Problems solved by technology

[0004] However, none of the above three experimental methods for identifying the interface quality of composite insulators can identify the debonding defects at the interface between the sheath and the mandrel. Among them, the naked eye observation method is usually only aimed at the aging of the sheath material, such as pulverization, cracking, And for interface defects, especially early interface defects have no effect

However, the rate of missed detection in the steep wave experiment is extremely high. The joint research results of researchers from many places show that even if the steepness of the applied voltage exceeds the provisions of GB / T 19519-2004 and DL 810-2002, it is still impossible to detect some defects at the interface. Insulator detection

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