A noise assessment method for power transformers based on noise separation

Abstract

The invention discloses a noise separation-based power transformer noise assessment method. The steps include: 1) building a voiceprint feature database in advance according to voiceprint feature information corresponding to noise signals generated by a fan component, an iron core component and a winding component when a standard power transformer is in different running states; 2) collecting in real time sound wave signals sent when a transformer to be tested runs, so as to obtain noise signals to be assessed; 3) separating noise signals generated by the fan component, the iron core component and the winding component from the noise signals to be assessed; and 4) extracting voiceprint feature information of each noise signal, identifying the running state of the transformer to be tested, and assessing the noise level of each component according to the running state. The noise separation-based power transformer noise assessment method provided by the invention can realize assessment of the noise level of each component in the power transformer utilizing acoustic characteristics, and has the advantages of easy operation implementation and high assessment precision and efficiency.

Description

technical field [0001] The invention relates to the technical field of noise evaluation of power transformers, in particular to a noise separation-based power transformer noise evaluation method. Background technique [0002] With the continuous increase of the scale of the power grid and the continuous improvement of the voltage level, the problem of noise impact of power equipment has become increasingly prominent. In recent years, the number of complaints related to the noise of power equipment has been increasing, and the noise impact of power equipment has become an urgent problem to be solved in the process of power grid construction. Transformers are one of the most important noise sources in power equipment. Through the evaluation of transformer noise, noise levels of transformer components and the reasons for exceeding standards, corresponding control methods for transformer noise can be proposed, which is of great significance to the development of power grid const...

AI Technical Summary

Problems solved by technology

[0003] The noise of a power transformer (hereinafter referred to as the transformer) is the superposition of the noise generated by each component, that is, it comes from multiple different internal components, but the current noise evaluation method of the transformer is usually aimed at the overall comprehensive noise of the transformer within a certain sound field range On the one hand, this type of method is aimed at the overall comprehensive noise, and its evaluation error is relatively large, so it cannot accurately evaluate the transformer noise; The mechanism of occurrence and the cause of exceeding the standard, so that it is impossible to propose a noise control method or improve the design plan in a targeted manner

[0004] Furthermore, the noise of the transformer mainly comes from the vibration generated by the magnetostriction of the iron core, the vibration generated by the electromagnetic force between the windings, and the vibration generated by the cooling device (such as a fan). The windings and iron cores of the source are surrounded by metal shells and insulating oil, so it is very difficult to detect the noise of each component; in addition, the noise of different power equipment in the substation (such as corona noise) will reflect and superimpose each other, which is also a certain problem. To a certain extent, it increases the difficulty of noise detection and control of various components

Therefore, in practical applications, it is impossible to achieve separate evaluation of noise by separately detecting the noise of each part of the transformer

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