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Method and system for detecting deformation of transformer winding

A technology of transformer winding and detection method, which is applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problems of misjudgment and low diagnosis accuracy.

Inactive Publication Date: 2015-11-25
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present application provides a transformer winding deformation detection method and system to overcome the problem that the frequency response method in the prior art has low diagnostic accuracy in detecting transformer winding deformation and may lead to misjudgment

Method used

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  • Method and system for detecting deformation of transformer winding
  • Method and system for detecting deformation of transformer winding
  • Method and system for detecting deformation of transformer winding

Examples

Experimental program
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Effect test

Embodiment 1

[0082] Such as figure 1 as shown, figure 1 It is a flowchart of a detection method for transformer winding deformation provided in Embodiment 1 of the present application. The detection method includes:

[0083] S101: collect the response terminal voltage and excitation terminal voltage of the transformer winding to be detected at different frequencies;

[0084] In the present application, the collection process includes: applying a sinusoidal frequency sweep signal to one end of the transformer winding to be tested; using the frequency response method to collect the response terminal voltage and excitation terminal voltage of the transformer winding to be tested at different frequencies.

[0085] Specifically, the transformer winding to be detected is selected, and a sinusoidal frequency sweep signal U is applied to one end of it S , and then measure and collect the response terminal voltage U of the transformer winding to be detected at different frequencies 2 (f) and ex...

Embodiment 2

[0099] The present application provides a more specific transformer winding deformation detection method on the basis of Embodiment 1, the method includes such as figure 1 Steps shown:

[0100] S101: collect the response terminal voltage and excitation terminal voltage of the transformer winding to be detected at different frequencies;

[0101] In the present application, the acquisition process includes: applying a sinusoidal frequency sweep signal to one end of the transformer winding to be detected; using the frequency response method to collect the response terminal voltage and excitation terminal voltage of the transformer winding to be detected at different frequencies.

[0102] Specifically, the transformer winding to be detected is selected, and a sinusoidal frequency sweep signal U is applied to one end of it S , and then measure and collect the response terminal voltage U of the transformer winding to be detected at different frequencies 2 (f) and excitation termin...

Embodiment 3

[0155] On the basis of Embodiment 1, Embodiment 3 of the present application provides a detection system for transformer winding deformation, such as Image 6 as shown, Image 6 It is a schematic structural diagram of a transformer winding deformation detection system provided in Embodiment 3 of the present application. The detection system includes: an acquisition unit 501, a first calculation unit 502, a rendering unit 503, a preprocessing unit 504, a second calculation unit 505, and a judgment unit 506, wherein,

[0156] The acquisition unit 501 is used to acquire the response terminal voltage and excitation terminal voltage of the transformer winding to be detected at different frequencies;

[0157] The first calculation unit 502 is used to calculate the modulus of the transfer function of the transformer winding to be detected according to the response terminal voltage and the excitation terminal voltage;

[0158] The drawing unit 503 is used to draw the frequency respo...

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Abstract

The invention provides a method and a system for detecting the deformation of a transformer winding. The method comprises: acquiring response end voltage and exciting end voltage of the transformer winding to be detected under different frequency; calculating a transfer function module value of the transformer winding to be detected according to the response end voltage and the exciting end voltage; drawing a frequency response curve in a coordinate system according to the transfer function module value under different frequency, and drawing a frequency response curve in the coordinate system when the transformer winding is normal; pre-processing the two frequency response curves by using an erosion method to obtain curve data satisfying a preset condition, and calculating relevant coefficients of the two frequency response curves; and judging the deformation condition of the transformer winding to be detected according to the magnitude of the relevant coefficients and relevant coefficient preset values. According to the method, the two frequency response curves drawn in the coordinate system are pre-processed by using the erosion method, so that burrs are removed, interference of noise such as electromagnetic signals and the like is avoided, the accuracy of diagnosis is improved, and the probability of misjudgment is reduced.

Description

technical field [0001] The present application relates to the technical field of power detection, and in particular to a detection method and system for transformer winding deformation. Background technique [0002] Transformer is an important electrical equipment in the power system. It plays an important role in energy distribution and voltage level conversion in the power system. Its operational reliability is an important guarantee for the stable and safe operation of the power system. The statistical results of actual operation show that winding deformation is one of the most common faults of transformers. Reliable and accurate detection of transformer winding deformation is of great significance to reduce the accident rate of power transformers and ensure the safe operation of transformers. [0003] The frequency response method is one of the most important methods to detect transformer winding deformation at home and abroad. For a certain transformer, its frequency r...

Claims

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Application Information

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IPC IPC(8): G01B7/16
Inventor 朱永利张宁卢敏阙凌燕
Owner STATE GRID CORP OF CHINA
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