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Transformer insulation thermal ageing state reliability evaluation method based on Weibull distribution

A thermal aging and reliability technology, which is applied in the directions of instruments, calculations, electrical digital data processing, etc., can solve the problems such as the difficulty of accurate evaluation of the thermal aging state of oil-paper insulation and the error of measurement methods, and achieve the accuracy of the thermal aging reliability value of oil-paper insulation Effect

Active Publication Date: 2014-08-13
STATE GRID CORP OF CHINA +1
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Problems solved by technology

The thermal aging parameters of oil-paper insulation directly or indirectly characterize the aging state of insulation, but due to the differences in the information contained in each parameter index and the errors caused by measurement methods, it is difficult to accurately evaluate the thermal aging state of oil-paper insulation.

Method used

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  • Transformer insulation thermal ageing state reliability evaluation method based on Weibull distribution
  • Transformer insulation thermal ageing state reliability evaluation method based on Weibull distribution
  • Transformer insulation thermal ageing state reliability evaluation method based on Weibull distribution

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Embodiment Construction

[0016] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

[0017] The thermal aging state of the oil-paper insulation can be evaluated by regularly analyzing the changes of the aging characteristic parameters of the insulating oil in the oil-paper insulation system of the transformer. figure 1 It is a flow chart of evaluating the reliability of oil-paper insulation thermal aging state in the present invention. The specific steps are as follows:

[0018] Step 1): Collect characteristic data of thermal aging of oil-paper insulation. Collect the characteristic parameters of the insulating oil and the characteristic parameters of the degree of polymerization of the insulating paper at each time monitoring point during the thermal ...

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Abstract

The invention discloses a transformer insulation thermal ageing state reliability evaluation method based on Weibull distribution. The transformer insulation thermal ageing state reliability evaluation method comprises the following steps: 1, collecting paper oil insulation thermal ageing characteristic data; 2, establishing a reliability evaluation index system; 3, determining comprehensive weights of all indexes; and 4, constructing a reliability evaluation hybrid Weibull distribution model, and evaluating a paper oil insulation thermal ageing state. According to the transformer insulation thermal ageing state reliability evaluation method, a reliability evaluation index system is established by analyzing the sensitivity of each paper oil insulation thermal ageing characteristic parameter to the thermal ageing state, and the paper oil insulation thermal ageing state reliability evaluation is performed by integrating the data and the weights of all the indexes. Compared with an existing paper oil insulation thermal ageing state evaluation method in the aspects of parameters such as the insulation paper polymerization degree and the content of furfuraldehyde in oil, the transformer insulation thermal ageing state reliability evaluation method has the advantages that the influence of the reliability of all the indexes to the overall reliability of paper oil insulation can be more sufficiently considered, and thus relatively accurate paper oil insulation thermal ageing reliability values can be obtained, and the accuracy rate of monitoring and evaluating the insulation ageing state of an oil immersible power transformer is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of transformer insulation aging state evaluation, in particular to a method for evaluating the reliability of transformer insulation thermal aging state based on a mixed Weibull distribution model. Background technique [0002] The aging life model of insulating materials for high-voltage electrical equipment has always been one of the research hotspots of scholars at home and abroad. Oil-paper insulation aging state evaluation technology is beneficial to improve the safe operation level of power transformers. The life evaluation model of oil-paper insulation mainly includes two research methods: a) The life evaluation model is obtained by fitting according to the accelerated aging test data of oil-paper insulation; b) According to the physical and chemical properties of oil-paper insulation aging, combined with space charge, partial discharge, etc. The damage mechanism is verified and the life evaluation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/28G06F17/50
Inventor 何志满王剑飞杨溢阳玉洁黄海舟李川邓军刘郑余洋顾婷
Owner STATE GRID CORP OF CHINA
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