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Cloud-model-theory-based method for evaluating insulation thermal ageing states of transformer

A thermal aging, cloud model technology, applied in the direction of testing dielectric strength, etc., can solve problems such as reducing the accuracy of evaluation results

Active Publication Date: 2014-09-03
STATE GRID CORP OF CHINA +1
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Problems solved by technology

In the traditional multi-parameter evaluation method, the fuzzy set theory uses the precise membership function to describe the one and the other characteristics of fuzzy things, so that the analysis process only considers the fuzziness of things and ignores the uncertainty, which reduces the evaluation results. the accuracy of

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  • Cloud-model-theory-based method for evaluating insulation thermal ageing states of transformer
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  • Cloud-model-theory-based method for evaluating insulation thermal ageing states of transformer

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Embodiment Construction

[0035] A detailed description is given below through a preferred embodiment.

[0036] figure 1 It is a flow chart of the present invention for evaluating the reliability of the thermal aging state of oil-paper insulation. The specific steps are as follows:

[0037] Step 1: Collect thermal aging characteristic data of oil-paper insulation. Collect the characteristic parameters of the insulating oil and the characteristic parameter of the degree of polymerization of the insulating paper during the thermal aging process of the oil-paper insulation of the power transformer. The characteristic parameters of the insulating oil include oil breakdown voltage, oil acid value, furfural content in oil, and dissolution in oil Characteristic gas content, the characteristic gas dissolved in oil includes H 2 , C 2 H 2 , CH 4 , C 2 H 4 , C 2 H 6 , CO, CO 2 .

[0038] Record the collected data and establish an initial data sample set. The information contained in the record includes time monitoring...

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Abstract

The invention provides a cloud-model-theory-based method for evaluating the insulation thermal ageing states of a transformer. The method comprises the steps that first, oil paper insulation thermal ageing characteristic data are collected, and oil paper insulation thermal ageing state grades are divided; second, the comprehensive weight of oil paper insulation evaluation indexes is determined according to the oil paper insulation thermal ageing characteristic data; third, a membership function model based on a cloud model is built according to the evaluation characteristics of the oil paper insulation thermal ageing states; fourth, the reliability states corresponding to the thermal ageing states are obtained according to the membership function model. The cloud-model-theory-based method for evaluating the insulation thermal ageing states of the transformer is high in credibility of the calculation result, and clear and accurate in evaluation conclusion, and the variation trend of the oil paper insulation ageing states of the transformer and the probability of the states of the transformer can be learnt about by calculating the degree of membership of oil paper insulation belonging to different state intervals.

Description

Technical field [0001] The invention relates to the technical field of transformer aging state detection, and in particular to a method for evaluating the thermal aging state of transformer insulation based on cloud model theory. Background technique [0002] The normal operation of the transformer is directly related to the safety and stability of the power system, and the operating life of the transformer largely depends on the aging state of the oil-paper insulation system. During the operation of the transformer, the insulating oil paper has been subjected to various external stresses such as heat, electricity, machinery, and chemistry for a long time, resulting in aging of the insulating material. Therefore, it is particularly important to accurately assess the aging state of the insulation system. [0003] The degree of polymerization of oil-impregnated insulating paper is the most important parameter to evaluate the aging state of insulation. Thermal aging is the main caus...

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Application Information

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IPC IPC(8): G01R31/12
Inventor 何志满王剑飞杨溢阳玉洁黄海舟刘郑邓军李川余洋顾婷
Owner STATE GRID CORP OF CHINA
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