Impact of transformer winding dry-out on frequency response analysis

Mehdi Bagheri, B. T. Phung, Trevor Blackburn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Frequency Response Analysis (FRA) has been in use since the last decade as a sensitive method in transformer internal defect recognition. This study has concentrated on the influence of transformer winding dry-out process on FRA spectrum. A single phase glassy model transformer involving concentric LV and HV windings is fabricated and taken as a test object. FRA traces for HV and LV windings of the test object are recorded for wet and dry condition of the paper insulation. KarlFischer Titration (KFT) is employed to determine the moisture content of the oil, and paper insulation humidity is derived using equilibrium curves. FRA trace deviations for HV and LV windings before and after dry-out process are elaborated and total capacitance variations due to the moisture diffusion through transformer windings are calculated and discussed.

Original languageEnglish
Title of host publication2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2013
Pages1113-1116
Number of pages4
DOIs
Publication statusPublished - Dec 1 2013
Externally publishedYes
Event2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2013 - Shenzhen, China
Duration: Oct 20 2013Oct 23 2013

Publication series

NameAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
ISSN (Print)0084-9162

Other

Other2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2013
CountryChina
CityShenzhen
Period10/20/1310/23/13

Keywords

  • Frequency response analysis
  • Moisture content
  • Temperature
  • Transformer dry-out

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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