Porcelain post insulator detection system and method based on vibration method

Abstract

The invention discloses a porcelain post insulator detection system and method based on a vibration method. The system comprises a vibration excitation device, a vibration receiving device and an SCT recording device and spectral analysis software. The vibration excitation device comprises two functional probes, one probe is an emission probe and used for emitting vibration waves, and the other probe is a receiving probe and used for receiving the vibration waves. The two functional probes of the vibration excitation device are connected to the SCT recording device, and the SCT recording device is connected with the spectral analysis software through a USB connection line. Compared with other detection methods, the porcelain post insulator detection technology based on vibration acoustical principles has the advantages that the detection range is large, all defects in a whole insulator can be detected, detection efficiency is high, large-area general investigation of the insulator can be achieved, live detection can be achieved, operation of a power system is not affected, principles are simple, and defect judgment is accurate, so the method has wide application and popularization prospects in the field of power system porcelain insulator nondestructive detection.

Description

technical field [0001] The invention relates to the technical field of insulator detection, in particular to a detection system and method for porcelain post insulators based on a vibration method. Background technique [0002] Porcelain insulators are very important components of the power grid system. Conventional methods for detecting porcelain insulators have shortcomings such as poor detection of micro-crack defects, many interference factors, and inability to perform online detection. It is difficult to meet the needs of rapid and effective detection and diagnosis of porcelain insulators. Therefore, it is of great significance to study the performance diagnosis of porcelain insulators by using an online non-destructive testing method with high reliability and strong field adaptability. [0003] In order to effectively detect the cracks of porcelain post insulators, non-destructive research work has been carried out on porcelain insulators at home and abroad. At present...

AI Technical Summary

Problems solved by technology

Commonly used testing methods include ultrasonic testing, ultraviolet imaging testing, and infrared testing, but these three nondestructive testing methods for porcelain insulators have serious limitations, and cannot ensure the online, reliable, and rapid assessment of the safety status of porcelain insulators in power systems.

[0004] Ultrasonic detection: Ultrasonic has a certain detection ability, but the operation is complicated and requires professional operation. Its detection accuracy is affected by multiple factors, resulting in a large number of missed detections and false detections, such as the performance of instruments and probes, the shape and geometric dimensions of pillars And the type, location, depth, surface roughness, etc. of the defect will have a greater impact on the ultrasonic detection results

The biggest problem is that ultrasonic flaw detection must be carried out in a power failure state and cannot be detected online at any time

[0005] Ultraviolet imaging detection: This method is only effective for cracks at the high-voltage end of porcelain post insulators. The area other than 1 / 3 of the high-voltage end cannot reach the corona inception voltage due to the weak electric field, so even if there are cracks, corona discharge cannot be generated. It is an ultraviolet electron optical flaw detection method. Due to the effect of stress, most of the defects of porcelain pillar insulators will appear at the bottom flange. At the same time, the dry cracking of the glued cement at the iron-ceramic junction of the high-voltage end pillar and foreign objects attached to the porcelain surface will cause discharge and luminescence. The observation phenomenon is completely consistent with the crack, which greatly affects the accuracy of the observation, so the detection rate of ultraviolet light is low

[0006] Infrared detection: The detection results of infrared detection methods are affected by multiple factors such as insulator surface emissivity, insulator load level, detection distance, atmospheric absorption, weather and infrared detection equipment. It is difficult to confirm the accuracy of the results. The quantitative relationship of calorific value has not been established, which greatly affects the application of this method

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