NDLI: FRA lookup charts for the quantitative determination of winding axial displacement fault in power transformers

Content Provider	IET Digital Library
Author	Tahir, Mehran Tenbohlen, Stefan
Abstract	Frequency response analysis (FRA) has gained attention as a reliable diagnostic tool, to assess the mechanical integrity of power transformers, due to standardised FRA measurement methods. However, the assessment of FRA results is still a challenge as it demands skilful personnel for diagnosis. Since there is no definitive and reliable code available for FRA interpretation. In this study, the three-dimensional (3D) finite integration technique is used to simulate the physical geometrical dimensions of a three-phase transformer which emulate the behaviour of real transformer and frequency response measurements. This novel method eliminates the need for lumped parameter circuit models, as it provides the ability to extract the FRA signatures directly from the 3D winding model. Axial displacement of different levels is simulated in several connection schemes. It was found that variation of the inter-winding capacitance due to the axial displacement possesses a linear relationship with the degree of axial displacement fault. This provides the possibility for the quantitative determination of winding axial displacement fault using FRA. A simple mathematical relation is derived for calculating the variation of inter-winding capacitance and a geometrical factor is introduced to generalise the method. Finally, lookup charts are introduced to diagnose axial displacement fault in different transformers.
Starting Page	2370
Ending Page	2377
Page Count	8
ISSN	17518660
Volume Number	14
e-ISSN	17518679
Issue Number	Issue 12, Dec (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/14/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2020.0273
Journal	IET Electric Power Applications
Publisher Date	2020-08-12
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	3D Winding Model Axial Displacement Fault FRA Interpretation FRA Lookup Charts FRA Result FRA Signatures Frequency Response Frequency Response Measurement Integration Inter-winding Capacitance Numerical Integration And Differentiation Power Transformer Power Transformer Testing Quantitative Determination Reliable Diagnostic Tool Standardised FRA Measurement Method Three-dimensional Finite Integration Technique Three-phase Transformer Transformer And Reactors Transformer Windings
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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