Nondestructive detection method of composite insulator

Abstract

The invention discloses a nondestructive detection method of a composite insulator. The nondestructive detection method of the composite insulator comprises the following steps: coating the surface of a to-be-detected composite insulator with an ultrasonic coupling agent; outputting a pulse signal by an ultrasonic testing system; uploading the pulse signal to an ultrasonic transducer by the ultrasonic testing system and converting the pulse signal into an ultrasonic signal; transmitting the ultrasonic signal by the ultrasonic transducer to the to-be-detected composite insulator to generate an ultrasonic echo signal; receiving the ultrasonic echo signal by the ultrasonic testing system, converting the ultrasonic echo signal into an electric signal and determining resonant frequency of the electric signal; and analyzing the viscidity condition of the interface of the to-be-detected composite insulator by the ultrasonic testing system according to a resonant frequency and preset resonant frequency comparison diagram. According to the embodiment of the invention, the composite insulator not containing macroscopic air gap can be subjected to nondestructive detection.

Description

technical field [0001] Embodiments of the present invention relate to non-destructive testing technology, in particular to a non-destructive testing method for composite insulators. Background technique [0002] With the advancement of the construction of UHV AC and DC transmission lines in my country and the aggravation of atmospheric environmental pollution, composite insulators have excellent hydrophobic migration performance, high mechanical strength, small size, light weight, good internal insulation performance, small corona, and electromagnetic interference. The advantages such as smallness are gradually highlighted, and the number of its use is increasing. At present, the number of composite insulators above 110kV in my country has exceeded 7.1 million, becoming the largest country in the use of composite insulators. Compared with traditional ceramic and glass insulators, the existence of the interface is the weak point in composite insulators. Improper technology an...

AI Technical Summary

Problems solved by technology

To sum up, the main technical problem faced by composite insulators in factory acceptance is that there is no non-destructive testing method that can distinguish whether there are viscous defects in insulators without macroscopic air gaps, and such defects are the most important manifestation of interface defects

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