Diagnosis Criterion of Abnormality of Transformer Winding by Frequency Response Analysis (FRA)
Diagnosis Criterion of Abnormality of Transformer Winding by Frequency Response Analysis (FRA)
复制标题
频率响应分析（FRA）诊断变压器绕组异常的标准
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
O. Kato
中科院分区：
文献类型：
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作者：
S. Miyazaki;Y. Mizutani;A. Taguchi;J. Murakami;N. Tsuji;M. Takashima;O. Kato
频率响应分析(FRA)是检测电力变压器内部异常的有力手段。然而，FRA对电力变压器的诊断标准还没有完全建立起来。本文提出了一种评价两个传递函数辨识度的新方法。在该方法中，使用了一个频率窗，并通过移动该窗来计算互相关因子。并将该方法应用于有异常和无异常的实际变压器传递函数。在此基础上，提出了用FRA诊断变压器绕组异常的客观判据。所提出的判据是基于有一些异常的变压器的少量数据。因此，拟议的标准是暂定的，将通过积累更多的数据加以改进。
Frequency response analysis (FRA) is a powerful technique to detect internal abnormalities within power transformers. However, diagnosis criteria of power transformers by FRA have not been fully established yet. In this paper, a new evaluation method of degree of identification between two transfer functions is proposed. In the proposed method, a frequency window is employed and cross‐correlation factor is calculated with moving the window. Furthermore, the proposed method is applied to transfer functions of real transformers with or without some abnormalities. Based on this discussion, objective criteria for diagnosis of abnormalities of transformer windings by FRA are proposed. The proposed criteria are based on a few data of transformers with some abnormalities. Therefore, the proposed criteria are tentative and they would be improved by accumulation of further data.