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Detection method of looseness fault vibration of power transformer winding

A technology for looseness of power transformers and windings, which is applied to instruments, measuring devices, electrical devices, etc., can solve the problems of inability to make judgments on deformation, and can not diagnose looseness of windings, etc., and achieve the effect of accurate looseness.

Inactive Publication Date: 2010-07-21
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

However, this method cannot judge the deformation within the deviation range of the winding process, let alone diagnose the loose winding.

Method used

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  • Detection method of looseness fault vibration of power transformer winding
  • Detection method of looseness fault vibration of power transformer winding
  • Detection method of looseness fault vibration of power transformer winding

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Embodiment Construction

[0047] The method of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0048]The vibration generated during the operation of the transformer mainly includes winding vibration and iron core vibration. The winding vibration is caused by the dynamic electromagnetic force applied to the winding due to the interaction between the load current and the leakage magnetic field. When a low voltage is applied to the high-voltage winding of the transformer and the low-voltage winding is short-circuited, the vibration of the transformer body is mainly caused by the winding, and the vibration of the iron core can be ignored. The vibration of the transformer winding will be transmitted to the wall of the oil tank through the insulating oil and supporting components, so the vibration of the winding can be reflected by monitoring the vibration of the transformer oil tank wall. Ideally, the winding vibration is propor...

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Abstract

The invention discloses a detection method of the looseness fault vibration of a power transformer winding, comprising the following steps of: gathering the original vibration signal of the power transformer winding and carrying out normalization processing by taking the large-sized power transformer winding as a monitoring object, and judging a special vibration state, the light looseness, the moderate looseness and serious looseness of the winding by calculating the Fourier frequency spectrum, the peak value, six time scale sampling entropies and a second-order sampling entropy. In the invention, the vibration signal which is sensitive to the change of the mechanical structure of the winding is adopted to make analysis to detect different degrees of looseness of the winding, and particularly, the invention can well detect the light looseness.

Description

technical field [0001] The invention relates to the technical field of power transformer safety monitoring, in particular to a method for diagnosing winding loosening faults by using vibration signals of power transformer windings. Background technique [0002] Large power transformers are very important and expensive equipment in the grid system. The interruption of power transmission network caused by power transformer failure will cause quite serious economic losses and social impacts, so it is very necessary to ensure the normal operation of large power transformers. [0003] During the operation of the transformer, the winding is prone to loosening due to the impact of short circuit, the aggravation of vibration caused by DC bias and the gradual aging of insulation. When the winding is loose, its ability to withstand short-circuit becomes poor, and the continuous short-circuit impact or lightning strike will further loosen the winding and even deform it. Loose winding...

Claims

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Application Information

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IPC IPC(8): G01H11/06
Inventor 黄海郭洁陈祥献
Owner ZHEJIANG UNIV
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