Transformer short-circuit fault comprehensive diagnosis method

Abstract

The invention relates to a transformer short-circuit fault comprehensive diagnosis method. The method is technically characterized by including the steps of checking a device once after the short-circuit fault happens to a transformer, analyzing the running working conditions and the protection action conditions to obtain the fault current, the working time and short-circuit process parameters, conducting conventional electrical experimental analysis and oil chromatogram experimental analysis so that whether faults or defects already exist in the transformer or not can be analyzed and the corresponding degrees and positions can be analyzed, conducting the winding deformation test so that whether deformation or concave-convex deformation happens to windings or not can be judged, demonstrating the short-circuit resistant capacity, and comprehensively judging the short-circuit fault of the transformer. By combining technical means of multiple subjects and multiple majors, the purpose of accurately evaluating the state of the transformer after the transformer bears short-circuit impact is achieved, the analysis time of technicians is greatly shortened, the result analysis accuracy is improved, the safe and stable running of the transformer and a power grid is ensured, and the running reliability and effectiveness of the power grid are ensured.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a comprehensive diagnosis method for short-circuit faults of transformers. Background technique [0002] With the continuous expansion of the scale of the power system and the closer connection between the power grids, the short-circuit current in the power system has increased year by year, which makes the operating conditions of power transformers more stringent. In addition, due to unreasonable production design and improper operation and maintenance, short-circuit impact damage of large power transformers occurs from time to time both at home and abroad. After the transformer is subjected to a sudden short-circuit accident, the status judgment and whether it can be put into operation have become issues that the operating unit often needs to make decisions. In addition, the detailed analysis of the transformer and the formulation of corresponding anti-accident measures ar...

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Problems solved by technology

Since the transformer has the characteristics of the integration of multi-disciplines (electricity, chemistry, mechanics, etc.) There are certain problems in terms of diagnosis speed, reliability and comprehensiveness

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