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On-line Detection Method of Power Transformer Winding Deformation Based on Pulse Coupling Injection

A power transformer and winding deformation technology, which is applied in the direction of electromagnetic measuring devices, electric/magnetic contour/curvature measurement, etc., can solve the problems of inability to detect the deformation of power transformer windings, difficulty in resisting sudden faults, and inability to obtain winding deformation information in time, etc. problem, to achieve the effect of light weight, simplified device volume and quantity, and rapid detection

Inactive Publication Date: 2017-09-05
CHONGQING UNIV
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Problems solved by technology

However, this method can only be used offline, and cannot detect the deformation of the power transformer winding online, and cannot obtain the information of the winding deformation in time, so it is difficult to resist sudden failures

Method used

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  • On-line Detection Method of Power Transformer Winding Deformation Based on Pulse Coupling Injection
  • On-line Detection Method of Power Transformer Winding Deformation Based on Pulse Coupling Injection
  • On-line Detection Method of Power Transformer Winding Deformation Based on Pulse Coupling Injection

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Embodiment Construction

[0025] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] figure 1 It is a flow chart of the method of the present invention, and the method of the present invention comprises the following steps: Step 1: the high-voltage nanosecond square wave pulse generator generates a high-voltage nanosecond pulse signal; Step 2: the high-voltage nanosecond pulse signal is injected and protected by a signal The circuit is transmitted to the transformer signal sensor installed in the transformer bushing, and the nanosecond pulse signal is coupled to the winding; Step 3: The data acquisition module collects the high-voltage nanosecond pulse signal and the current response signal of the neutral point at the end of the winding, and converts it into Digital signal; step 4: the data processing module carries out Fourier transform to described digital signal, obtains the frequency response curve of winding, an...

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Abstract

The invention discloses an online detection method for winding deformation of a power transformer based on pulse coupling injection, and belongs to the technical field of online detection of electric power equipment. The method comprises the following steps: 1) a high-voltage nanosecond square wave pulse generator generates a high-voltage nanosecond pulse signal; 2) the high-voltage nanosecond pulse signal is transmitted to a transformer signal sensor installed in a transformer bushing through a signal injection and protection circuit, and the The nanosecond pulse signal is coupled to the winding; 3) the data acquisition module collects the high-voltage nanosecond pulse signal and the current response signal of the neutral point at the end of the winding, and converts it into a digital signal; 4) the data processing module processes the digital signal. Liye transform, obtain the frequency response curve of the winding, and calculate the characteristic parameters such as the correlation coefficient and standard deviation of the frequency response curve, and judge the deformation degree of the transformer winding. The method can realize the non-invasive on-line detection of winding deformation, and has the advantages of fast detection speed, no damage to the power system, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of on-line detection of electric power equipment, and relates to an on-line detection method for winding deformation of a power transformer based on pulse coupling injection. Background technique [0002] Power transformer is the core equipment of substation, its safe and stable operation plays an important role in ensuring the reliability of power supply and improving economy. According to incomplete statistics, winding deformation accounts for nearly half of the various failure factors that cause transformer damage and outage. Transformer transportation, operation, insulation aging damage, explosion of dissolved gas in oil, earthquake and other force majeure can cause different degrees of deformation of the winding, especially in the case of a short-circuit at the external outlet of the transformer during operation, the short-circuit current in the winding forms a huge electromagnetic The force causes the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/28
Inventor 姚陈果赵仲勇李成祥赵晓震米彦廖瑞金李昭炯陈晓晗
Owner CHONGQING UNIV
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