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Method and system for identifying numbers of partial discharge sources of transformers

An identification method and transformer technology, applied in the field of detection, can solve problems such as unsatisfactory performance, and achieve the effect of simple structure and simple method.

Inactive Publication Date: 2011-09-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Geiger's Circle Criterion performs well at high SNR, but not so well at low SNR

Method used

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  • Method and system for identifying numbers of partial discharge sources of transformers
  • Method and system for identifying numbers of partial discharge sources of transformers
  • Method and system for identifying numbers of partial discharge sources of transformers

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Embodiment Construction

[0047] Figure 5 The capacitance value of each capacitor in , , . And the resistance value of each resistor is , , .

[0048] Aiming at the importance of identifying the number of PD sources for ultrasonic PD positioning, the present invention aims to provide a system and method for identifying the number of PD sources for broadband array signal processing of transformers.

[0049] The invention uses an ultrasonic array sensor to receive partial discharge ultrasonic broadband signals to form an array model, and uses broadband focusing and improved Geigerd circle algorithms in the broadband array signal processing algorithm to realize the identification of the number of partial discharge sources. It provides an effective reference for the number of sources released and the maintenance strategy.

[0050] In order to achieve the above purpose, the present invention provides a number identification system and method for broadband array signal processing of partial di...

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Abstract

The invention relates to a method and a system for identifying numbers of partial discharge sources of transformers and is used for monitoring and positioning the partial discharge of the transformers. The technical solution comprises the steps of receiving ultrasonic broadband signals emitted by the partial discharge sources by employing an ultrasonic sensor array and forming an array model, then converting the broadband signals received by the ultrasonic sensor array to narrow band signals through a TCT algorithm in broadband array signal processing algorithms, and finally identifying the numbers of the partial discharge sources of the transformers by employing an improved Gerschgorin circle method. The invention also provides the identification system. The method not only realizes accurate online identification of the numbers of the partial discharge sources in the transformers, but also realizes simple and easy execution with the number identification system, which is simple in structure.

Description

technical field [0001] The invention relates to a method for identifying the number of partial discharge sources of a transformer and a special detection system, belonging to the technical field of detection. Background technique [0002] With the increase of power supply capacity, the requirements for the reliability of the power system operation are getting higher and higher, and the power transformer is the key equipment in the power system, and its operation reliability is directly related to the safety and stability of the power system. Statistical analysis of actual faults shows that insulation faults are the main reason affecting the normal operation of transformers, and partial discharge is an important cause of insulation faults. [0003] At present, the development of condition-based maintenance of power equipment has become an inevitable trend, and accurate localization of partial discharge not only plays an important auxiliary role in the assessment of the degree...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 谢庆律方成李燕青王永强王子建赵涛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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