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Method and system for detecting winding deformation faults of power transformer

A technology for deformation of power transformers and windings, applied in instruments, measuring devices, and measuring ultrasonic/sonic/infrasonic waves, etc., to achieve low computational complexity, good repeatability, and simple implementation

Active Publication Date: 2012-10-10
JIANGSU ELECTRIC POWER CO +2
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the existing power transformer winding deformation fault detection method based on vibration signal analysis, and provide a real-time online detection, and realize simple power transformer winding deformation fault detection method and system

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  • Method and system for detecting winding deformation faults of power transformer
  • Method and system for detecting winding deformation faults of power transformer
  • Method and system for detecting winding deformation faults of power transformer

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Embodiment Construction

[0023] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0024] The idea of ​​the present invention is based on the existing power transformer fault detection technology based on vibration signal analysis, to conduct experimental analysis on the internal relationship between the winding deformation fault and the vibration signal spectrum, in order to find out the obvious and repeatable can accurately reflect The characteristics of winding deformation faults, and fault detection based on these characteristics.

[0025] To this end, a large number of experiments have been carried out. Vibration sensors are installed on the outer surface of the oil tank of the power transformer, the vibration signal is collected by the signal acquisition device, and then the vibration signal is de-noised, and finally the de-noised signal is subjected to fast Fourier transform. Obtain the spectrum of the vibration signal. Throug...

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Abstract

The invention discloses a method for detecting winding deformation faults of a power transformer. The method includes that different vibration characteristics of the transformer in a normal state and a fault state are combined according to running characteristics of the transformer, vibration signals are monitored by a vibration sensor mounted on the surface of the transformer, frequency spectrums of the vibration signals are analyzed, and the transformer is judged to have winding deformation faults if the ratio of 50Hz energy sum and 150Hz energy sum to (50+150Hz) energy sum to (100+200Hz) energy sum which are actually measured is obvious increased as compared with that of the transformer in the normal state and an actually measured 100Hz energy value is hardly changed or even reduced as compared with that of the transformer in the normal state. The invention further discloses a system for detecting the winding deformation faults of the power transformer. The method and the system have the advantages of obvious fault characteristics and good repeatability, and are universal for power transformers of the same type, engineering implementation is simple, and diagnosis is intuitive.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of power transmission and transformation equipment, in particular to a method and system for detecting deformation faults of power transformer windings. Background technique [0002] With the development of the power industry, the capacity of power equipment and the scale of the power grid continue to expand. In order to reduce the huge economic losses and social impact caused by power equipment failures, improve power quality, and ensure that power equipment and systems are safe, reliable, economical, stable and high-quality Operation, the condition-based maintenance strategy based on online monitoring and fault diagnosis technology will become an inevitable trend of future development. The stability and reliability of transformers greatly affect the safe operation of the entire power grid. Statistical analysis shows that a considerable number of transformer failures come from winding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 陈楷王春宁马宏忠耿志慧李凯李勇赵宏飞陈静民
Owner JIANGSU ELECTRIC POWER CO
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