Voltage transformer on-load tap-changer mechanical fault diagnosis method

Abstract

The invention relates to a voltage transformer on-load tap-changer mechanical fault diagnosis method of which key technical points are that a vibration detection probe is adhered to a box wall of an on-load tap-changer in a surface-mounted manner, vibration signals generated in tap-changer operation processes can be captured, the vibration signals are subjected to energy frequency band decomposition operation via wavelet packet analysis technologies, frequency spectrum characteristics of the signals can be extracted, a state characteristic vector can be formed, a characteristic vector database is formed via signal collection and storage, an Euclidean distance function is used for analyzing a changing trend of the characteristic vector, and a mechanical state of the on-load tap-changer is diagnosed and assessed. Via the voltage transformer on-load tap-changer mechanical fault diagnosis method, the vibration signals generated in the tap-changer operation processes can be captured in real time, a characteristic quantity of the vibration signals is extracted and is compared with historical data, whether a fault occurs is determined and a fault development trend is determined, overhaul cost is lowered, detection efficiency is raised, early stage mechanical faults can be found timely and effectively, and the faults can be prevented from worsening.

Description

technical field [0001] The invention belongs to the technical field of high-voltage testing of transformers, in particular to a method for diagnosing mechanical faults of transformer on-load tap changers. Background technique [0002] The on-load tap changer is a switching device that provides a constant voltage for the transformer when the load changes. It is the only frequently operated mechanical and electrical device in the transformer. With the increase of the number of voltage adjustments, the mechanical failure and electrical failure of the on-load tap-changer also increase accordingly, and it is easy to burn out and cause a power outage accident of the transformer. According to relevant statistics, mechanical failures of on-load tap-changers account for more than 90% of the total number of failures. At present, the diagnosis method for mechanical faults of on-load tap-changers is mainly power failure maintenance. When the on-load tap-changer has been in operation f...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a method for diagnosing mechanical faults of transformer on-load tap-changers, and solve the problems of long detection period and waste of manpower and financial resources in power failure maintenance.

Images