Nuclear-magnetic-resonance-technology-based method for detecting transformer oil ageing state parameters

Abstract

The invention discloses a nuclear-magnetic-resonance-technology-based method for detecting transformer oil ageing state parameters. The ageing state parameters comprise oil sample viscosity, oil sample density, oil sample furfural content, oil sample resistance and the like. The method comprises the following steps: performing nuclear magnetic resonance spectrum analysis on a solution gas-containing transformer oil sample and detecting the parameters, wherein the oil sample viscosity eta is measured through the formula shown in the abstract, T1 and T2 respectively refer to longitudinal/transverse relaxation time of the oil sample, T1 is measured by an inversion recovery method, T2 is measured by a CPMG method, the oil sample density and the other parameters are measured by measuring the content of CHn functional groups in the oil sample by utilizing a two-dimensional J-resolved spectroscopy nuclear magnetic resonance analysis method according to a relation model between the content of functional groups and the oil sample density and other parameters; and n in the CHn is equal to 0, 1, 2 and 3. The method has the advantages of few sample quantity, simple and direct sampling process, high analysis speed, high analysis accuracy and the like.

Description

technical field [0001] The invention relates to a method for detecting the working condition of electric equipment, in particular to a method for detecting the aging state parameters of a transformer. Background technique [0002] The power transformer is the heart of the power grid, and the safe and stable operation of the transformer is of great importance. The aging monitoring of transformer oil is an important means of transformer fault prediction. [0003] Dissolved gas analysis technology in transformer oil is based on the corresponding relationship between the type of dissolved gas in transformer oil and internal faults to diagnose transformer fault types, fault locations and fault degrees. However, at present, there is no relevant technical solution that can be used to directly detect the dissolved gas content in transformer oil at home and abroad. The conventional dissolved gas analysis technology must extract the gas generated by the transformer fault from the tra...

AI Technical Summary

Problems solved by technology

In the three-ratio method, the various gases are aimed at the oil samples in the transformer body, and are not valid for the oil samples in the gas relay. Only the attention value of the content of each gas component or the attention value of the gas growth rate can be used to judge that the transformer is faulty. Gas ratios are only valid when , and have no meaning for normal transformer ratios

At the same time, there are still some other deficiencies in the three-ratio method. For example, there may be no corresponding ratio coding in the actual situation, and for example, the ability to judge multiple faults concurrently is limited, and the membership degree of multiple faults cannot be given. Incomplete reflection, etc.

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