Transformer winding deformation on-line monitoring method based on on-line frequency response method

Abstract

The invention provides a transformer winding deformation on-line monitoring method based on an on-line frequency response method. The transformer winding deformation on-line monitoring method comprises the steps that a swept-frequency signal is generated and is loaded to a transformer winding through a power amplifier; a data acquiring module acquires a low-voltage signal filtered through a second filter and converts the low-voltage signal to a digital signal; a data processing module converts the digital signal to a frequency response, calculates coefficients related to distinguishing of transformer winding deformation according to the input digital signal and judges the degree of the transformer winding deformation. The transformer winding deformation is analyzed based on the frequency response method so that the deformation degree of the transformer winding can be monitored on line, and the accidents caused by the transformer winding deformation can be prevented in time. Due to the fact that the frequency of an interference signal is not located in the range of frequency scanning points, electromagnetic interference is effectively reduced. A frequency spectrum signal is directly output and displayed, a frequency-response curve can be analyzed visually, and the deformation degree of the transformer winding can be judged.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an online monitoring method for transformer winding deformation based on an online frequency response method. Background technique [0002] As the core equipment of the power system, the safe operation of the transformer plays a very important role in ensuring the safety of the power grid. Due to the transformer design, process manufacturing and operating environment, the transformer winding may be loosely deformed, especially after the transformer is subjected to overvoltage, the winding will have irrecoverable deformation. When the deformation is severe, it will affect the local electric field distribution and accelerate the local grease Aging of insulation until breakdown occurs. [0003] For this reason, the State Grid Corporation listed it as one of the technical problems to be solved in the 12th Five-Year Plan; it is stipulated in Article 15.2 of the ...

AI Technical Summary

Problems solved by technology

There are also some units in China that conduct online system monitoring research on transformer winding changes, but due to the low precision and poor sensitivity of the system, it is difficult to achieve accurate online monitoring

Images