Fault detection method for defects of disc type insulator

Abstract

The invention discloses a fault detection method for defects of a disc type insulator. A fault detection system for defects of the disc type insulator is built; a detection transducer is distributed on the disc type insulator; detection processing is carried out every time by using the detection transducer as an excitation source, and detection signals are collected by using the detection transducer as a receiving terminal, so that original acquisition data matrices which possibly exist in defective areas are acquired; in the case of no defects, the original acquisition data matrices in various areas are subjected to Butterworth filter, wavelet video analysis and noise reduction by using matching pursuit algorithm so as to acquire standard sampling data; in the case of defects, the original acquisition data matrices which possibly exist in the defective areas are subjected to Butterworth filter and noise reduction processing to acquire real-time detection data; and through comparison between the real-time detection data and the standard sampling data, existence of the defects and the relative sizes of the defects are judged. According to the disclosed by the invention, the more effective and scientific fault detection of the defects of the disc type insulator is realized.

Description

technical field [0001] The invention relates to a fault detection method, in particular to a fault detection method for basin type insulator defects. Background technique [0002] The construction of transmission network is an important direction of national strategic development. The development of UHV transmission has been included in my country's medium and long-term development plan, which will have an important impact on the field of power transmission and transformation in the future. At present, my country has built a very long UHV AC transmission line. At present, most of the switchgears used in UHV transmission lines are gas-insulated combined switchgears. Due to the characteristics of small footprint, high reliability, long service life, less influence by climate conditions, less maintenance work, compact device structure and easy installation, it is suitable for large power hubs, where the terrain is complex or narrow. Areas are also easy to apply. As an import...

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Problems solved by technology

However, at present, there are few researches on ultrasonic guided wave nondestructive testing technology for pot insulators in my country.

Tang Hemeizi from Shandong University proposed a method of using the UHF method to detect faults of pot insulator defects in "Research on the Discharge Characteristics of Typical Defect Types of GIS Partial Discharge Based on the UHF Method", and then used the UHF method to detect the faults of the basin insulator defects The main problem is that the external sensor has low sensitivity and will be affected by electromagnetic interference such as mobile phone signals in the surrounding environment, and effective shielding measures must be taken; in addition, this method cannot achieve quantitative detection, and cannot measure the size of the partial discharge TV. Therefore, it is impossible to judge the severity of the defect, which is the biggest obstacle to its application

Existing technology does not have a fast, efficient, scientific and accurate detection method and system for fault detection of basin insulator defects

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