Method for detecting deformation of power transformer windings

A technology for power transformers and detection methods, which is applied in the field of transformers and can solve problems such as low accuracy

Active Publication Date: 2015-02-25
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0008] In view of the above defects or improvement needs of the prior art, the present invention provides a detection method for the deformation of the power transformer winding

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  • Method for detecting deformation of power transformer windings
  • Method for detecting deformation of power transformer windings
  • Method for detecting deformation of power transformer windings

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Embodiment Construction

[0086] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0087] The invention provides a detection method for winding deformation of a power transformer. On the basis of the existing technology, the short-circuit impedance method, voltage ratio test, winding capacitance method, and voltage ratio test are comprehensively used, and the long-term work experience of engineering personnel is integrated into the test results. , analyze the four kinds of test results, carry out logical processing on all the test results, and obtain the comprehensive test results. Concentrate the advantages of various methods, highlight the advantages of various methods in detec...

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Abstract

The invention discloses a method for detecting deformation of power transformer windings. The method includes the following steps that the short-circuit impedance relative change rate, the overall correlation coefficients of amplitude-frequency curves, the amplitude-frequency curves of a low frequency band, a medium frequency band and a high frequency band, the local correlation coefficients of the amplitude-frequency curves of all the frequency bands, the voltage ratio deviation and the capacitance relative change rate are acquired; the deformed windings and phase results are acquired according to the short-circuit impedance relative change rate and the overall correlation coefficients of the amplitude-frequency curves; according to the correlation coefficient of the amplitude-frequency curve of the low frequency band and the voltage ratio deviation, turn-to-turn or cake-to-cake short circuit detection results are acquired; according to the correlation coefficient of the amplitude-frequency curve of the medium frequency band and the capacitive relative change rates between the windings, local deformation results are acquired; according to the correlation coefficient of the amplitude-frequency curve of the high frequency band and the ground capacitance relative change rates of the windings, whole displacement or lead displacement deformation detection results of winding coils are acquired; the results are logically processed, and a comprehensive detection result is acquired. According to the method, reliability of the deformation detection result of the power transformer windings is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of transformers, and more specifically relates to an analysis method for winding deformation of power transformers. Background technique [0002] With the increasing installed capacity of the power system, the short-circuit capacity and short-circuit current in the system also increase, and various short-circuit accidents near the outlet of the power transformer running in the system will inevitably occur. When a power transformer is subjected to a short-circuit impact, the strong power generated by the short-circuit current in the winding will damage the winding insulation and mechanical properties to varying degrees, and in severe cases, the transformer can be damaged. A short circuit at the outlet of the transformer at a close distance will cause winding deformation, insulation damage, and winding burnout. A short-circuit accident will generally cause the transformer to trip and withdraw from operation, ...

Claims

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Application Information

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IPC IPC(8): G01B7/16
Inventor 臧春艳李冰阳邹林李锐海罗兵袁耀
Owner HUAZHONG UNIV OF SCI & TECH
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