Method and system for comprehensively diagnosing deformation of transformer winding

Abstract

The invention discloses a method and a system for comprehensively diagnosing deformation of a transformer winding. The method comprises steps: firstly, the winding capacitance, the frequency response, the short circuit impedance, the short circuit current and the accumulated short circuit time data of the transformer are acquired, deformation indexes are provided, and the acquired data are used for calculating the deformation indexes; according to the relation between the deformation indexes and winding deformation grades, each deformation index corresponding to each winding deformation grade is determined; and according to an expert system and a knowledge base, the current transformer deformation condition is determined accurately. Through a large amount of experimental analysis, the method selects several deformation indexes closely related to the winding deformation from a plurality of indexes, the corresponding relation between the deformation indexes and the winding deformation grades is built, and the judgment accuracy is ensured while the calculation work is simplified; and the whole structure of the system is simple, the operation is convenient, and whether deformation happens to the transformer winding and the deformation degree are comprehensively diagnosed automatically according to current test data and the operation condition.

Description

technical field [0001] The invention belongs to the technical field of electric power engineering, and in particular relates to a comprehensive diagnosis method and system for transformer winding deformation. Background technique [0002] The transformer is the core equipment of the power grid system, and it is also one of the most expensive equipment. Its operation status directly affects the safety and stability of the entire power grid system. Due to the reasons of design and manufacturing, process materials, operation and maintenance, and operating environment, transformer winding deformation faults occur from time to time, especially under the influence of short-circuit current, transformer windings are affected by strong electromotive forces, and collapse, overall distortion and Mechanical permanent deformation such as displacement. Timely detection and repair of transformer winding deformation faults can prolong the operating life of the transformer, thereby reducing...

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Problems solved by technology

The above three methods all reflect the deformation of the transformer windings to a certain extent, but a preliminary judgment on the deformation of the windings requires extensive on-site experience, and it does not consider the operating conditions of the transformer (short-circuit current and accumulated short-circuit time). Comprehensive and accurate diagnosis of transformer winding deformation degree and fault type

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