High-voltage cable joint internal defect detection method based on X-ray imaging technology

Abstract

The invention provides a high-voltage cable joint internal defect detection method based on an X-ray imaging technology, and belongs to the technical field of cable joint detection. The method comprises the following steps of: S1, preprocessing an X-ray original image through employing a high-voltage cable joint internal structure maya model; S2, extracting internal typical defect characteristic information by adopting a high-voltage cable joint internal structure typical defect atlas model; and S3, adopting a high-voltage cable joint internal fault intelligent detection expert system to accurately identify and position the X-ray image, and detecting and diagnosing the state of the high-voltage cable joint. On the basis of digitized X-ray imaging information, the internal defects of the high-voltage cable joint are recognized through a proper image processing technology, and the accuracy is higher.

Description

technical field [0001] The invention relates to the technical field of cable joint detection, in particular to a method for detecting internal defects of high-voltage cable joints based on X-ray imaging technology. Background technique [0002] High-voltage transmission lines and substations are the backbone and the most important part of the power system. The safe, reliable and stable operation of high-voltage transmission lines directly affects the stable development of the national economy. Therefore, it is necessary to monitor and monitor high-voltage power transmission equipment. Power cables are wires for power transmission, and they undertake extremely important power transmission tasks. It has been more than a hundred years since the first cable was laid. In the actual line operation process, due to construction, aging, manufacturing defects, installation defects and other factors, the probability of cable failure is very high. Cable faults lead to the failure of ...

AI Technical Summary

Problems solved by technology

The invention can effectively detect the integrity of the cable joints and reduce the cable failure rate caused by the quality problems of the cable joints, but it cannot detect the internal defects of the cable joints

[0004] The patent document with the publication number CN107870202A discloses a detection method for internal defects of cable joints, which is used to solve the problem that the detection accuracy of live partial discharge test method for detecting internal defects of cable intermediate joints in the prior art is not high, and it is difficult to detect internal defects of cable intermediate joints. Some technical issues with minor flaws

This method is based on the transmission and reflection characteristics of ultrasonic waves. By attaching the ultrasonic probe to the outer surface of the cable joint, transmitting ultrasonic signals to the inside of the cable joint and receiving the returned ultrasonic reflection signals, and calculating Whether the time difference between the ultrasonic signals is consistent with the preset time difference can determine whether there is an internal defect detection in the cable joint, but the correct recognition rate of this method is low, and it is difficult to distinguish false faults

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