zPulse characteristics and pattern analysis of corona discharges with different pressboard insulation barriers

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Muhammed Faisal Rahman
B. Nageshwar Rao
Pradeep M. Nirgude

Abstract

Corona discharge is one of the significant problem associated with power transformer and can occur due to sharp points or free conductive particles. The existence of sharp points at joints or terminals or conducting parts is very difficult to avoid completely during the manufacturing process of the transformer. The free conductive particles can arise from manufacturing process or can be developed during service period of the transformer. These free conductive particles can adhere to paper or pressboard insulation barrier or freely move in the bulk oil. In transformers highly non uniform fields are often present due to sharp points and free conducting particles, so detecting their effect on the transformer is very critical for the life of transformer. In the present investigation, to generate a high voltage corona in air or oil, a test chamber of dimension 50cm x 50cm x 50cm made from Perspex material and fitted with removable needle plane electrode arrangement has been used. The discharge measurements are carried out using Partial Discharge (PD) measurement technique according to IEC 60270. The results obtained are presented and discussed. Discharge pulse characteristics such as magnitude, rise time and decay time of different needle plane barrier configurations are analyzed. This paper also discussing pattern analysis and dominant frequency of discharges due to different needle plane barrier configurations.

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How to Cite
Faisal Rahman, M., Nageshwar Rao, B., & Nirgude, P. M. (2017). zPulse characteristics and pattern analysis of corona discharges with different pressboard insulation barriers. Power Research - A Journal of CPRI, 25–30. Retrieved from https://node6473.myfcloud.com/~geosocin/CPRI/index.php/pr/article/view/132

References

  1. Kogan V. I, Fleeman J. A, Provanzana J. H, Shih C. H. “Failure analysis of EHV transformers”. IEEE Transactions on Power Delivery; Vol. 3, No. 2; pp. 672–683; April 1988.
  2. S.V. Kulkarni and S.A. Khaparde, Transformer Engineering, Design, Technology and Diagnostics, 2nd Edition, CRC Press, Taylor and Francis Group, New York, 2012.
  3. S.A. Stigant and A.C. Franklin , The J And P Transformer Book: A Practical Technology of the Power Transformer, 10th Edition, Wiley, New York, 1973.
  4. N. Izeki, A. Kurahashi and K. Matsuura, “Behavior of Oil Corona and Damage of Transformer Insulation”, IEEE Trans. Power App. Syst., Vol. 90, No. 5, pp. 23302338, 1971.
  5. A. Zouaghi and A. Beroual, “Discharge Structure and DielectricStrength of Long Oil Gaps in the Presence of an Insulating Barrier”, IEEE Conf. Electr. Insul. Dielectr. Phenomena, Vol. 2, pp. 660–663, 1997.
  6. F. Guerbas, M. Zitouni, A. Boubakeur and A. Beroual, “Barrier Diameter Effect on the Behavior of Transformer Oil Submitted to AC Voltage”, Int’l. Conf. High Voltage Eng. Application, Shanghai, China, pp. 570–574, 2012.
  7. F. Guerbas, M. Zitouni , A. Boubakeur and A. Beroual, “Barrier effect on breakdown of point–plane oil gaps under alternating current voltage”, Generation, Transmission & Distribution, IET, Vol. 4, No. 11, pp.
  8. –1250, 2010.
  9. G. C. Stone, “Partial Discharge Diagnostics and Electrical Equipment Insulation Condition Assessment”, IEEE Trans. Dieletrc. Electr. Insul., Vol. 12, No.5, pp. 891-903, 2005.
  10. K. S. Yadav and R. Sarathi, “Influence of Thermally Aged Barrier on Corona Discharge Activity in Transformer Oil”, IEEE Trans. Dieletrc. Electr. Insul., Vol. 22, No.5, pp. 2415-2423, 2015.

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