Method for judging fault type of winding based on power transformer

Abstract

A method for judging a fault type of a winding based on a power transformer includes the following steps of collecting frequency response data of the transformer to be detected, drawing a frequency response curve according to the frequency response data, setting up a KLC model and selecting all parameters of the KLC model according to the type of the transformer to be detected, simulating the KLC model, obtaining changes, corresponding to the changes of different types of parameters, of the frequency response curve by changing the parameters of the KLC model, setting up the corresponding relationship between deformation of the winding of the transformer to be detected and the parameter changes of the KLC model, obtaining the parameter changes, corresponding to the frequency response curve, of the KLC model according to a frequency response curve chart of the transformer to be detected, and obtaining deformation of the winding of the transformer to be detected according to the parameter changes, corresponding to the frequency response curve chart of the transformer to be measured, of the KLC model. The KLC model of the winding of the transformer is set up according to the specific characteristics of the transformer to be detected so that the fault type of the winding of the transformer to be detected can be judged, the result is more accurate and more reliable, and the method is easy and convenient to operate.

Description

technical field [0001] The invention relates to the field of transformer fault judgment, in particular to a winding fault type judgment method based on a power transformer winding KLC model. Background technique [0002] Transformer is the main electrical equipment in the power system, and its normal operation is of great significance to the safe production and reliable operation of the power system. According to statistics, about 25% of transformer failures are caused by winding deformation. When the transformer is in the process of transportation and operation, the transformer winding may be deformed by impact, vibration or short circuit. The mechanical deformation is a cumulative process. The transformer winding has accumulated many impacts, and it is very easy to be damaged by a short circuit impact. Cause winding instability and damage, thus causing losses to the grid operation. Therefore, an accurate and feasible determination method of winding fault type is very cri...

AI Technical Summary

Problems solved by technology

With the rapid development of modern science and technology, the research on winding deformation diagnosis technology is also deepening, and various deformation diagnosis methods are emerging, from the classic low-voltage pulse method, short-circuit impedance method, to the current vibration frequency response method, The transfer function method, and even the scanning frequency response method, each have their own research characteristics and use conditions, and can also be applied to the diagnosis of windings, but they are all limited to the judgment of the severity of winding deformation, and do not involve winding deformation The location and type of occurrence, which makes it impossible for field technicians to have a specific understanding of the internal deformation of the winding, which affects the deployment of the next detection work

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