Method and system for detecting deformation of transformer winding

Abstract

The invention discloses a method and a system for detecting the deformation of a transformer winding. According to the method and the system, winding oil pressure data is acquired, and is subjected to functional transformation to obtain a harmonic component of oil pressure data after failure; a harmonic component amplitude ratio is acquired by calculating the oil pressure data harmonic component after failure to the oil pressure data harmonic component before failure; the amplitude ratio is determined, and the winding is deformed if the amplitude ratio exceeds the threshold value. Thus the oil pressure data can be quickly and accurately acquired by utilizing the characteristics of high speed, high accuracy and large measurement range of a pressure sensor in the prior art after the transformer is failed, functional transformation and harmonic component ratio are adopted in the calculating process, error carried by the oil pressure parameter is reduced, data error caused by external affecting factors can be reduced, the detection accuracy is improved, whether the winding is deformed or not can be determined without halting or long-time halting of the transformer, so that the operation efficiency of the transformer can be improved.

Description

technical field [0001] The invention relates to the field of power equipment fault detection, in particular to a transformer winding deformation detection method and system. Background technique [0002] The rapid development of my country's industry is inseparable from an efficient and reliable power supply system. In order to ensure efficient and reliable power supply, the power supply system needs to accurately detect the faulty power equipment, especially the transformer of the power supply system. According to statistics on transformer faults, winding deformation caused by insufficient winding short-circuit strength accounts for more than 60% of transformer faults. [0003] In the prior art, there are frequency response methods for detecting transformer winding deformation. By measuring the transformer frequency response and comparing its changes to determine whether the winding is deformed, there are also methods such as low-voltage pulse method and short-circuit react...

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Problems solved by technology

[0003] In the prior art, there are frequency response methods for detecting transformer winding deformation. By measuring the transformer frequency response and comparing its changes to judge whether the winding is deformed, there are also methods such as low-voltage pulse method and short-circuit reactance method. The above methods all require transformer It is out of operation, and the test period is long, and the site interference is large. If abnormalities are found, it is necessary to check the hanging cover, which greatly reduces the operating efficiency of the transformer.

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