Comprehensive fault diagnosis system suitable for 35 kV transformer of wind power plant

Abstract

The invention relates to a comprehensive fault diagnosis system suitable for a 35 kV transformer of a wind power plant. The system is characterized by comprising an acquisition module, a judgment module and a diagnosis module, wherein the acquisition module is used for obtaining contents of various dissolved gases in transformer insulating oil on the basis of an insulating oil chromatographic analysis detection result, wherein dissolved gases include C2H4 and C2H6; the judgment module is used for judging whether super-standard items exist or not is judged according to the contents of the dissolved gases in transformer insulating oil and generating a judgment result; the diagnosis module is used for fault diagnosis through a three-ratio method and a ratio-free method under the condition that the super-standard items exist, and if codes cannot be found when the three-ratio method is used for fault diagnosis, the result of the ratio-free method serves as the standard; meanwhile, whether C2H4 / C2H6 is larger than 3 or not is judged, and if yes, a TD graph method is used for comprehensive analysis diagnosis to obtain a diagnosis result. According to the system, staff of a wind power plant can quickly and accurately locate faults of a wind power box, the operation and maintenance cost is reduced, and the operation reliability of the wind power plant is improved.

Description

technical field [0001] The invention belongs to the technical field of wind power, and in particular relates to a comprehensive fault diagnosis system suitable for a 35kV transformer in a wind farm. Background technique [0002] At present, my country's wind power generation is dominated by onshore wind power. Wind farms mostly use wind turbines with a capacity of 1.5MW to 2MW, a grid-connected terminal of 690V, and 50Hz. They are connected to the grid through a two-stage boost method. In the wind farm, each wind turbine will be equipped with a 35kV box-type transformer (hereinafter referred to as "box transformer"), so each wind farm has a considerable number of 35kV box transformers, which are connected to the wind farm 66kV / The 110kV / 220kV mains are connected in phase change, and then connected to the power grid. [0003] The 35kV box-type substation installed in the wind farm is generally arranged in the shape of a square, and is mainly composed of a low-voltage flat s...

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Problems solved by technology

[0007] Although GB7252-2001 "Guidelines for the Analysis and Judgment of Dissolved Gases in Transformer Oil" provides methods for chromatographic fault diagnosis of insulating oil such as the three-ratio method, the number of wind turbines is large, and the faults of wind power box transformers in harsh environments are more complicated. , it is difficult to accurately locate the fault with a single method, which will cause serious hidden dangers to the safe production of the wind farm. Therefore, a fault diagnosis system that can quickly and accurately locate the fault of the wind power box substation through insulating oil chromatography is needed

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