Examining the ageing of transformer insulation using FRA and FDS techniques
- 9 April 2015
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Dielectrics and Electrical Insulation
- Vol. 22 (2), 1258-1265
- https://doi.org/10.1109/tdei.2015.7076829
Abstract
Frequency response analysis (FRA) is a widely accepted testing technique to assess the mechanical condition of a power transformer. However, it has been reported that FRA is also sensitive to non-mechanical parameters such as the temperature and moisture content of the insulation. Therefore, further studies are required to investigate the ability of FRA on examining the transformer insulation condition. In this paper a study based on an insulation degradation of a single phase 5 kVA model transformer is presented. Throughout the accelerated insulation degradation process, FRA and Frequency Domain Dielectric Spectroscopy (FDS) measurements are performed to analyze the degradation condition. Two methodologies are proposed to analyze the FRA results based on the relative change of capacitance and change of inter-winding capacitance. Results obtained from these approaches are verified with FDS analysis.Keywords
This publication has 8 references indexed in Scilit:
- Influence of temperature on frequency response analysis of transformer windingPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2013
- A study on suitability of different transformer winding models for frequency response analysisPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2012
- Case studies of factors influencing frequency response analysis measurements and power transformer diagnosticsIEEE Electrical Insulation Magazine, 2011
- Effects of the Insulation Quality on the Frequency Response of Power TransformersJournal of Electrical Engineering & Technology, 2006
- Exploring Possibilities for Characterization of Power Transformer Insulation by Frequency Response Analysis (FRA)IEEE Transactions on Power Delivery, 2006
- Field Experiences With Measurements of Dielectric Response in Frequency Domain for Power Transformer DiagnosticsIEEE Transactions on Power Delivery, 2006
- The impact of drying and oil impregnation conditions and of temperature cycles on the clamping force of power transformer windingsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Dielectric response methods for diagnostics of power transformersIEEE Electrical Insulation Magazine, 2003