Capacitor monitoring and fault diagnosis system and method thereof

A fault diagnosis system and fault diagnosis technology, applied in signal transmission systems, instruments, measurement power and other directions, can solve the problems of unreasonable structural design of online monitoring system, failure to take into account the correlation of monitoring quantities, and ignoring the multi-faceted fault causes. Achieve the effect of realizing data off-site and remote access, satisfying the changes of the diagnosis matrix, and suppressing various interferences

Active Publication Date: 2013-09-11
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]1. The monitoring quantity is single or the correlation between the monitoring quantities is not considered, ignoring the multifaceted nature of the fault causes
[0006]2. The diagnosis of capacitor faults needs to combine the relevant experience of the staff, which increases the workload of the staff, and the diagnosis system is not intelligent enough
[0007]3. The structural design of the online monitoring system is unreasonable, and there are few means of real-time monitoring

Method used

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  • Capacitor monitoring and fault diagnosis system and method thereof
  • Capacitor monitoring and fault diagnosis system and method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Now there are symptoms of failure x 3 high temperature, x 4 The dielectric loss becomes larger, use "0" to indicate that there is no symptom, "0 1” indicates the severity of symptoms, so the symptom set is X={0,0,0.4,0.8,0,0}, and the fault diagnosis matrix obtained by neural network training is

[0048] R=

[0049] The fuzzy vector Y of the fault cause can be calculated by using it.

[0050] Y=XR={0,0.392,0,0.128,0.763,0.621,0.444}, according to the principle of maximum membership degree, the diagnosis result is y 5 Operational overvoltage and inrush current cause the above symptoms, which is consistent with the actual diagnosis results.

[0051] When the result has two maximum values ​​or the difference between the two values ​​is not large, the continuous multiplication method can be used, that is, take a small value for the 0 elements in the fuzzy diagnostic matrix, such as 0.05, and then multiply the relevant element values ​​​​according to the column, and c...

Embodiment 2

[0053] Verify the data collected when the capacitor has no faults, the method is as described above, and the capacitor fault symptom matrix obtained at this time is , the fuzzy vector can be obtained from the formula Y=XR as , according to the principle of maximum membership degree, it can be concluded that the capacitor is not faulty at this time, which is consistent with the actual diagnosis result.

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Abstract

The invention relates to a transformer substation capacitor online monitoring and fault diagnosis system and a method thereof and belongs to the technical field of electrical equipment state maintenance. The transformer substation capacitor online monitoring and fault diagnosis system comprises a control module for starting signal acquisition, a remote signal acquisition module for acquiring and outputting capacitor running characteristic signals, a signal receiving module for receiving signals which are output from the remote signal acquisition module, a data storage module for storing signal data and a data analysis module for performing signal analysis on the signal data of a storage unit and outputting analysis results. According to the transformer substation capacitor online monitoring and fault diagnosis system and the method thereof, real-time monitoring can be conveniently performed on the capacitor running state, a warning can be issued once fault hidden dangers occur, and subsequent major accidents are prevented.

Description

technical field [0001] The invention relates to a system and method for on-line monitoring and diagnosing capacitor faults in substations, and belongs to the technical field of condition maintenance of electrical equipment. Background technique [0002] Electrical equipment is the basic component of the power system and the basis for ensuring the reliability of power supply. The safe operation of electrical equipment is the prerequisite for the safe, stable and economical operation of the power system. Capacitor, as a very important reactive power compensation device, plays an important role in improving the structure of the power system and improving the power quality. Its stable operation is an important guarantee for the safety of the power system. [0003] In the long-term operation, because of the operating environment, human factors and design problems, capacitor failures occur frequently, which seriously threatens the safe operation of the power system. Therefore, st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G08C17/02
Inventor 杜大全范辉高树国潘瑾贾伯岩
Owner STATE GRID CORP OF CHINA
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