Transformer on-load tap-changer fault diagnosis method based on vibration characteristics

Abstract

The invention relates to a transformer on-load tap-changer fault diagnosis method based on vibration characteristics. The transformer on-load tap-changer fault diagnosis method comprises steps of detecting original off-line vibration data; detecting original electrification vibration data; obtaining an original off-line vibration energy curve; calculating original off-line vibration characteristic parameters; obtaining an original electrification vibration energy curve, calculating original electrification vibration characteristic parameters; detecting electrification vibration data to be diagnosed; obtaining an electrification vibration energy curve to be diagnosed; calculating electrification vibration characteristic parameters to be diagnosed; calculating a correlation coefficient A of the electrification vibration energy curve to be diagnosed and the original electrification vibration energy curve and a range difference (B and C) of the electrification vibration characteristic parameters to be diagnosed and the original electrification vibration characteristic parameters; judging whether faults exist through the correlation coefficient A and the range difference (B and C); detecting off-line vibration data to be diagnosed; calculating an off-line vibration energy curve to be diagnosed; calculating off-line vibration characteristic parameters to be diagnosed; calculating a correlation coefficient A of the off-line vibration energy curve to be diagnosed and the original off-line vibration energy curve and a range difference (E and F) of the off-line vibration characteristic parameters to be diagnosed and the original off-line vibration characteristic parameters; and judging whether faults exist through the correlation coefficient D and the range difference (E and F).

Description

technical field [0001] The invention relates to a fault diagnosis method for an on-load tap changer of a transformer, in particular to a fault diagnosis method for an on-load tap changer of a transformer based on vibration characteristics. Background technique [0002] The on-load tap-changer is an important part of a large-scale power transformer, and it is also the focus of transformer accidents. After a mechanical failure of the on-load tap-changer, it will often cause serious transformer accidents and power outages, resulting in major social and economic losses. The detection and diagnosis of tap changer faults are of great significance to ensure the safety of the power grid and the reliability of power supply. When the on-load tap-changer is in operation, the contact between the moving and fixed contacts will generate pulse impact force, thus generating vibration signals. The vibration signal is transmitted to the terminal through the fixed contact or transformer oil, ...

AI Technical Summary

Problems solved by technology

At present, the main problems in the diagnosis of on-load tap-changer faults through vibration data are: 1. The existing vibration analysis technology mostly uses simple time-domain envelope analysis and spectrum analysis. Due to the strong randomness of vibration signals, the same The time-domain envelope diagram or spectrum diagram measured twice before and after the same state and test conditions of the on-load tap-changer is often quite different, and it is difficult to extract the characteristic parameters that effectively reflect the mechanical state of the on-load tap-changer

2. Due to the lack of effective characteristic parameters, the existing on-load tap-changer fault diagnosis technology based on vibration data is poor in field operability, the sensitivity of characteristic parameters to reflect faults is low, the diagnostic parameters are simple and single, and the judgment accuracy is low, especially the lack of effective Quantitative diagnostic methods are difficult to promote and apply

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