Transformer winding deformation degree and fault diagnosis method based on frequency response analysis method

Abstract

The invention provides a transformer winding deformation degree and fault diagnosis method based on the frequency response analysis method. First, the waveform of a power distribution device connected with a high-voltage casing is measured by an oscilloscope, the oscilloscope is connected in parallel between the end of the high-voltage casing and a knife switch to obtain the waveform of external electromagnetic interference signals, and short-circuit grounding is carried at a secondary side and at a third side respectively. The frequency response analysis method is a sensitive method for analyzing the deformation degree of a transformer winding. According to the frequency response analysis method, whether a winding deforms is judged by comparing response curves. The frequency response analysis method has strong anti-jamming capability, so that the test result has good repeatability and is more in line with the requirement of state overhaul. Transformer lead dismantling is needed in current field test. Therefore, the invention provides a test method for testing a transformer winding without dismantling a lead through interference signal filtering, and the efficiency of on-site transformer winding deformation degree detection is improved.

Description

technical field [0001] The invention relates to a method for diagnosing the deformation degree and fault of a transformer winding based on a frequency response analysis method. Background technique [0002] The power transformer is an important part of the power system, and its reliable operation is of great significance to the security of the power grid. After the transformer is installed and put into operation in the substation, it is usually difficult to disassemble it to observe the internal electrical components of the transformer. The transformer winding is the main part of the transformer fault damage. The collision during transportation and installation, and the short-circuit fault during operation will cause the deformation of the transformer winding. When the transformer winding is deformed, it will not immediately lead to accidents. As a hidden hidden danger, once an accident occurs, it will bring huge economic losses and influence to the operation of the power ...

AI Technical Summary

Problems solved by technology

[0012] In some protection systems, due to the existence of protection dead zone or the state of action failure, the winding may withstand short-circuit current for a long time. At this time, the electromotive force generated by the short-circuit current exceeds the mechanical strength of the winding, resulting in permanent damage. Deformation, causing the winding to deform

[0013] When the frequency response method is used to test the deformation degree of the transformer winding, it is easily disturbed by the adjacent electromagnetic field.

At present, in the actual on-site inspection, it is usually necessary to remove the lead wire of the transformer bushing. The inspection process is labor-intensive, and frequent removal of the wire will also cause certain damage to the transformer.

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