Winding loosening judgment method based on transformer noise sound image graph

A technology for loose windings and transformers, applied in the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and instruments. The effect of difficulty and portability

Inactive Publication Date: 2019-01-11
GUANGXI POWER GRID ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for judging loose windings based on the acoustic image of transformer noise, thereby overcoming the shortcomings of existing transformer winding faults that cannot be detected during transformer operation

Method used

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  • Winding loosening judgment method based on transformer noise sound image graph
  • Winding loosening judgment method based on transformer noise sound image graph
  • Winding loosening judgment method based on transformer noise sound image graph

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Embodiment Construction

[0035] The technical solutions in the present invention are clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0036] like figure 1 As shown, the winding looseness judging method based on the transformer noise acoustic image provided by the present invention comprises the following steps:

[0037] S1, through the measurement of the voiceprint imaging instrument, the noise image of the transformer under normal conditions is obtained (such as figure 2 and image 3 shown) and the acoustic image of transformer noise in the loose winding state (such as Figure 4 shown); the sound image...

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Abstract

The invention discloses a winding loosening judgment method based on transformer noise sound image graph, and belongs to the technical field of power transformer safety monitoring. Carrying out the image processing the transformer noise sound image graph by obtaining a transformer noise sound image graph, and obtaining a corresponding gray histogram, performing a statistical feature processing onthe gray histogram to obtain a statistical feature, obtaining whether the transformer is normally operated or not by the comparison of online measurement statistical feature with feature database according to the statistical feature. The adopted sound image graph is not affected by electromagnetic interference in the transformer substation, reducing the difficulty of signal extraction processing,the internal structure of the transformer is not affected during measurement, and no influence on normal operation is affected, can judge whether the transformer is loose or not without influencing the transformer.

Description

technical field [0001] The invention belongs to the technical field of power transformer safety monitoring, and in particular relates to a method for judging winding looseness based on a transformer noise sound image. Background technique [0002] Judging from the process and phenomenon of short-circuit accidents of power transformers in recent years and their subsequent dismantling inspections, the reason why power transformers are damaged immediately after short-circuit is mainly due to the lack of short-circuit resistance of the transformer itself. Among them, the worse the winding compression is, the more the accidents of power transformer damage due to loosening and deformation of the winding under the action of short-circuit force are on the rise. It is worth noting that, from many field examples, the loss of short-circuit strength of the winding is not a one-time process, but a process of being gradually eroded over the years. A short circuit causes the winding to lo...

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Application Information

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IPC IPC(8): G01N29/06
CPCG01N29/069G01N2291/269
Inventor 余长厅黎大健陈梁远张玉波张磊颜海俊赵坚
Owner GUANGXI POWER GRID ELECTRIC POWER RES INST
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