On-line monitoring system for dissolved gas in transformer oil based on embedded platform

Abstract

The invention relates to an on-line monitoring system for a dissolved gas in transformer oil based on an embedded platform. Aiming at the problems that an existing transformer online monitoring deviceis easily influenced by the phenomena, such as that the chromatographic base line jitter, the chromatographic base line shifts, the chromatographic base line has the abnormal points, the interferenceis large, the waveform is irregular, etc., in the chromatographic peak recognition, so that the misjudgment and the missed judgment of the chromatographic peak are caused and the existing device is lack of self-adaption and self-learning capabilities for misjudgment and the missed judgment of the chromatographic peak, and accordingly the measurement distortion of the gas component data is caused,and the accuracy of the fault diagnosis is further influenced. Under an embedded Vxworks operating system, the on-line monitoring system of the present invention adopts a differential threshold filtering method, a rough penalty method, the first-order and second-order derivatives, a PSO-SVM (particle swarm optimization support vector machine) and other algorithms to carry out the interference peak identification and the gas component classification on a series of chromatographic peaks in chromatographic curve sequence data after oil-gas separation, and calculates the gas concentration value.According to the system, the accuracy and stability of the chromatographic analysis are greatly enhanced, and the performance of an online monitoring device for the dissolved gas in the transformer oil is improved.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to an online monitoring system for dissolved gas in transformer oil involved in power grids, power plants and specific industrial users. Background technique [0002] The transformer is the core equipment in the power system. In addition to insulating and cooling the insulating oil in the transformer body, the concentration and combination ratio of the dissolved gas in the oil can also reflect in real time whether there are defects, faults and insulation status inside the transformer. Wait. Therefore, oil chromatography has become an effective means for real-time monitoring of transformers. Transformer online monitoring systems have been widely used in fields such as power plants, coal, steel mills, and petrochemical industries from the beginning of intelligent substations to the present. [0003] With the increase of the power grid capacity and the service life of the transfo...

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Problems solved by technology

[0004] The present invention is aimed at the jitter and drift of the baseline of the chromatographic curve obtained after the separation of dissolved gas in the current transformer oil at different temperatures, there are abnormal points, and the low-concentration curve has great interference , Irregular chromatographic peaks and other problems, for the current classification of chromatographic peaks, the methods of single parameter, fuzzy membership degree and gray correlation degree are adopted. In the case of strong interference, high temperature and high humidity, it is easy to misjudgment and misjudgment of chromatographic peaks. Although the use of multi-parameter weight analysis improves the accuracy of misjudgment and missed judgment of chromatographic peaks to a certain extent, the misjudgment and missed judgment of chromatographic peaks lack self-learning ability, thereby reducing the accuracy of gas concentration , proposed a new intelligent monitoring system for dissolved gas in oil based on an embedded platform

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