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A state monitoring device and method for high voltage shunt reactor

A state monitoring device and reactor technology, applied in the direction of using electrical devices, measuring devices, using electromagnetic means, etc., can solve the problems of loose components, large magnetic leakage, aggravated vibration, etc., and achieve the effect of easy and practical human-computer interaction interface. Good and reliable results

Active Publication Date: 2021-10-08
STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main magnetic circuit of the high-voltage shunt reactor core is generally designed as a structure with gaps, and it will run at full load for a long time after it is put into operation. The magnetic flux leakage is large, and the mechanical vibration is more serious than that of the transformer. Loose components such as fasteners will further aggravate the occurrence of vibration, and in severe cases, it may cause defects such as overheating and discharge inside the equipment, so it is one of the important causes of reactor failures
The mechanical vibration defect of the reactor is often a latent hidden danger, which is difficult to accurately diagnose through commonly used electrical characteristic parameters
The detection means of high-voltage shunt reactors in the prior art mainly adopts the method of oil chromatography analysis or partial discharge detection. It is difficult to detect mechanical defects such as loose coils, iron cores or fasteners sensitively, accurately and early with the existing methods, and it is urgent to study effective methods for detecting mechanical defects of reactors and apply them in engineering practice

Method used

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  • A state monitoring device and method for high voltage shunt reactor
  • A state monitoring device and method for high voltage shunt reactor
  • A state monitoring device and method for high voltage shunt reactor

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Experimental program
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Embodiment 1

[0063] like Figure 1-2 As shown, the embodiment of the present invention provides a condition monitoring device for a high-voltage shunt reactor, including a connected vibration signal acquisition unit and a signal processing unit 3;

[0064] The vibration signal acquisition unit is arranged on the high-voltage shunt reactor, collects the vibration signal on the surface of the high-voltage shunt reactor, and sends it to the signal processing unit 3; in a preferred embodiment mode of the embodiment of the present invention, the vibration signal The acquisition unit includes a vibration signal sensor 1 and a signal acquisition card 2, the vibration signal sensor 1 is arranged on the outer surface or the inner surface of the high voltage shunt reactor, its number can be one or more, and its output terminal is connected to the The input end of the signal acquisition card 2 is connected; the output end of the signal acquisition card 2 is connected with the input end of the signal ...

Embodiment 2

[0076] The difference between the embodiment of the present invention and embodiment 1 is:

[0077] Described time-frequency analysis module adopts wavelet transform to process the vibration signal received, defaults to 8 layers of decomposition, obtains the wavelet decomposition coefficient of vibration signal; specifically comprises the following steps:

[0078] The wavelet transform formula is:

[0079]

[0080] Among them, ψ(t) is the wavelet basis function, a is the scaling factor, and τ is the translation factor. When adopting db4 wavelet to do discrete wavelet transform, the calculation formula of the coefficient of the wavelet decomposition of described vibration signal is as shown in formula (4):

[0081] WT(n)=C*x(n),n={0,1,2...N-1} (4)

[0082] Where C is the transformation matrix, and the specific expression is:

[0083]

[0084] Where the blank space is 0,

[0085] The state evaluation module obtains the state eigenvalue A of the signal based on the wa...

Embodiment 3

[0092] Based on the same inventive concept as in Embodiment 1, the embodiment of the present invention provides a state monitoring method for a high-voltage shunt reactor, including:

[0093] Obtain the vibration signal on the surface of the high voltage shunt reactor;

[0094] Using an appropriate time-frequency analysis method to perform time-frequency analysis on the received vibration signal to obtain the corresponding eigenvalues, and then perform state evaluation of the high-voltage shunt reactor based on the eigenvalues ​​and an appropriate state evaluation method to obtain state evaluation results, Complete the monitoring of the high voltage shunt reactor.

[0095] In a specific implementation manner of the embodiment of the present invention, the time-frequency analysis is performed on the received vibration signal by using a suitable time-frequency analysis method to obtain the corresponding eigenvalues, and then based on the eigenvalues ​​and the appropriate state e...

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Abstract

The invention discloses a state monitoring device and method for a high-voltage shunt reactor, comprising a connected vibration signal acquisition unit and a signal processing unit; the vibration signal acquisition unit is arranged on the high-voltage shunt reactor, and collects The vibration signal on the surface is sent to the signal processing unit; the signal processing unit performs time-frequency analysis on the received vibration signal to obtain the corresponding eigenvalue, and then conducts state evaluation of the high-voltage shunt reactor based on the eigenvalue , to obtain the state evaluation results, and complete the state monitoring of the high-voltage shunt reactor. Experiments have proved that the invention can accurately detect defects such as reactor windings and iron core looseness, and provides multiple time-frequency analysis and state evaluation methods, so that the invention can be comprehensively compared and analyzed, and has higher reliability.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of high-voltage electrical equipment, and in particular relates to a state monitoring device and method for high-voltage shunt reactors. Background technique [0002] In order to enhance reactive power compensation and reactive power balance in the power system, suppress system overvoltage, improve power quality and power supply reliability, high-voltage shunt reactors have been widely used. The main magnetic circuit of the high-voltage shunt reactor core is generally designed as a structure with gaps, and it will run at full load for a long time after it is put into operation. The magnetic flux leakage is large, and the mechanical vibration is more serious than that of the transformer. Loose fasteners and other components will further aggravate the occurrence of vibration, and in severe cases, it may cause defects such as overheating and discharge inside the equipment, so it is one of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H11/08
Inventor 戴锋陈轩谭风雷吴金利马宏忠侯鹏飞吴书煜赵若妤陈昊张兆君
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH