An attempt to investigate transformer failure by Dissolved Gas Analysis

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Published Dec 30, 2017
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Volume 13, Issue 4, December 2017

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H. C. Keshavamurthy
Joint director, Dielectrics Materials Division, Central Power Research Institute, Bangalore-560080
D. Ravindra
HOD-Additional director, Dielectrics Materials Division, Central Power Research Institute, Bangalore-560080

Abstract

Reliable and continued performance of power transformer is the key to profitable generation, transmission & distribution. Power transformer failures lead to power supply interruptions in developing nations like India. DGA technique plays an important role in nullifying these unforeseen interruptions. One of the best methods of detecting certain problems which can lead to failure of the transformer is dissolved gas analysis (DGA). failure rate of transformers is very high in India - 25% per annum which is not favorable compared to international failure rate of 1-2%. To prevent failures, effective analysis and diagnosis needs to be investigated. Transformer failures presented in this paper are catastrophic and of high interest. Case studies are presented here for the transformers which have higher fault gas concentrations.An attempt has been made in this paper to assess in-service transformers, new transformers after factory tests and internal condition of service on load tap changers by dissolved gas analysis.

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How to Cite
Keshavamurthy, H. C., & Ravindra, D. (2017). An attempt to investigate transformer failure by Dissolved Gas Analysis. Power Research - A Journal of CPRI, 607–614. Retrieved from https://node6473.myfcloud.com/~geosocin/CPRI/index.php/pr/article/view/1026

References

  1. A guide to transformer maintenance by S.D.Meyers, J.J.Kelly and R.K.Parrish
  2. IEEE – standard guide C-57.104-Guide for the interpretation of gas generated in oil immersed transformers – 1992.
  3. H C Keshavamurthy and D Ravindra “Technology trend in Design, Testing and Operation & Maintenance of Power & Distrubution Transformers”, Seminar on Power transformer failure analysis through dissolved gas analysis, CPRI, Bangalore, 26th October 2017.
  4. IEC –60599 – Mineral oil impregnated electrical equipment in service – Guide to the interpretation of dissolved and free gas analysis – 1999.