Detection and quantitative diagnosis of axial displacement of transformer winding by frequency response analysis
Detection and quantitative diagnosis of axial displacement of transformer winding by frequency response analysis
复制标题
频率响应分析变压器绕组轴向位移检测与定量诊断
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
S. Tenbohlen
中科院分区：
文献类型：
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作者：
S. Miyazaki;M. Tahir;S. Tenbohlen
对绕组轴向位移的Transformer进行了频响分析（FRA），在几种接线方案下测量了其传递函数，并评价了这些接线方案下测量的传递函数对轴向位移的灵敏度。为了客观评价，采用了一些数值指标，发现电感式绕组间测量对轴向位移最敏感。此外，一个简单的电路模型，提出了重现测量的传递函数。所提出的电路模型的所有参数都可以从FRA中测量的传递函数确定。该模型还可以通过改变一个参数来再现随轴向位移的实测传递函数。传递函数的参数随轴向位移的变化与轴向位移的大小呈良好的线性关系。这表明，FRA轴向位移的定量诊断的可能性。
Transfer functions of a transformer whose winding is axially displaced are measured in several connection schemes of frequency response analysis (FRA), and the sensitivities of the measured transfer functions in these connection schemes to the axial displacement are evaluated. For the objective evaluation, some numerical indices are employed, and it is found that the inductive inter-winding measurement is the most sensitive to the axial displacement. Furthermore, a simple circuit model is proposed to reproduce the measured transfer functions. All the parameters of the proposed circuit model can be determined from the measured transfer functions in FRA. The proposed model can also reproduce the measured transfer functions with the axial displacement by varying one parameter. The variation of the parameter in reproducing the transfer function with the axial displacement show good linear relation to the amount of the axial displacement. This indicates the possibility of a quantitative diagnosis of the axial displacement by FRA.