Transformer safety state assessment method based on oil chromatography

Abstract

The invention discloses a transformer safety state assessment based on oil chromatography, comprising steps of determining an oxygen-containing type of a transformer according to the nitrogen-oxygen rate inside the transformer, obtaining preset fault energy intensity threshold L1,L2and L3 according to the oxygen-containing type of the transformer, obtaining the dissolving content X1, X2, X3 and X4 of the methane, the ethane, the ethene and the acetylene in the transformer, calculating fault energy intensity P according to the X1, X2, X3 and X4, calculating transformer fault energy intensity index PI according to the L1, L2, L3 and P, and determining the safety state of the transformer according to the PI. The transformer safety state assessment method based on oil chromatography disclosed by the invention has less set thresholds by comparing with the DGA method which is commonly adopted, has simple calculation logic and has higher reaction sensitivity to the safety condition caused by server faults like the high energy overheating and arc discharge.

Description

technical field [0001] The invention relates to the field of safety and reliability evaluation of power transmission and transformation equipment, in particular to a transformer safety state evaluation method based on oil chromatography. Background technique [0002] The insulation and cooling oil medium of power transformers will undergo physical and chemical changes under the action of the operating environment, and cracking will produce a small amount of flammable gases such as methane, ethane, ethylene, acetylene, hydrogen, carbon monoxide and carbon dioxide. These gas components and contents dissolved in the oil medium reflect the degree of transformer insulation aging or (potential) failure to a certain extent. [0003] At present, in the practice of power industry at home and abroad, the DGA method (Dissolved gas analysis, dissolved gas analysis method) is generally used for safety analysis of transformers, that is, the safety status level of transformers is judged by...

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Problems solved by technology

[0005] An embodiment of the present invention provides a method for evaluating the safety state of an oil chromatographic transformer to solve the problems in the prior art that there are many thresholds set in the method for evaluating the safety state of transformers, the calculation logic is complicated, and the problems caused by various transformer faults are solved. The problem of low reaction sensitivity of safe state

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