A comparison of trans-admittance and characteristic impedance as metrics for detection of winding displacements in power transformers

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• 作者：A. Singh ; F. Castellanos ; J.R. Marti ; K.D. Srivastava
• 关键词：FRA ; TLD ; Winding deformation ; Condition monitoring
• 刊名：Electric Power Systems Research
• 出版年：2009
• 出版时间：June 2009
• 年：2009
• 卷：79
• 期：6
• 页码：871-877
• 全文大小：967 K

文摘

Transfer function signatures are commonly used in condition monitoring analysis to give early indications of winding movement in power transformers. This paper presents a comparison of the use of trans-admittance (frequency response analysis, FRA), presently the industry standard, and characteristic impedance (transmission line diagnostics, TLD), a new method, as signatures for the detection of winding displacements in power transformers. To facilitate the comparison, a computer based winding model based on a multi-phase transmission line system was developed and different winding deformations were analyzed. The results show that TLD has a higher degree of sensitivity and can be used to augment the ability to classify different types of distortions currently diagnosed by FRA.