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Improved Online Monitoring Method for Transformer Winding Deformations Based on the Lissajous Graphical Analysis of Voltage and Current

機(jī)譯：基于電壓和電流李薩如圖形分析的改進(jìn)的變壓器繞組在線監(jiān)測方法

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Power transformers have important roles as voltage converters in substations, which directly affect the safe operation of power grids. Online monitoring of winding deformation, which is one of the most common transformer faults, is crucial in protecting transformers from damage, particularly those induced by short-circuit current failures, and ensuring their safe operation. This study proposes an improved online monitoring method for winding deformations based on the Lissajous graphical analysis of voltage and current. A practical measurement system is also presented and discussed in this paper. A load normalization method is proposed to solve the problem of Lissajous diagrams changing as load varies. Finally, transformer and winding experiments are performed to verify the validity of the proposed load normalization method and the feasibility of the proposed monitoring method in distinguishing winding deformations with different degrees and locations.
機(jī)譯：電力變壓器在變電站中起著重要的作用，它直接影響電網(wǎng)的安全運(yùn)行。在線監(jiān)測繞組變形是變壓器最常見的故障之一，對于保護(hù)變壓器免受損壞（尤其是由短路電流故障引起的損壞）并確保其安全運(yùn)行至關(guān)重要。本研究基于電壓和電流的李薩如圖形分析，提出了一種改進(jìn)的繞組變形在線監(jiān)測方法。本文還提出并討論了一種實(shí)用的測量系統(tǒng)。提出了一種負(fù)荷歸一化方法來解決李薩如圖隨負(fù)荷變化而變化的問題。最后，進(jìn)行了變壓器和繞組實(shí)驗(yàn)，以驗(yàn)證所提出的負(fù)荷歸一化方法的有效性以及所提出的監(jiān)測方法在區(qū)分不同程度和位置的繞組變形中的可行性。

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