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Investigation of partial discharge activity of single conducting particle in transformer oil under DC voltages using UHF technique

Investigation of partial discharge activity of single conducting particle in transformer oil under DC voltages using UHF technique

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Published

Converter transformers play an important role in the high-voltage DC power transmission system. The insulation of these transformers is stressed by both AC and DC voltages. Particle contamination is one of the major problems in insulation structures, as they generate partial discharges. A methodical experimental study was carried out to understand the partial discharge formation because of single macroscopic conducting particle movement in transformer oil at different temperatures under DC voltages using ultra-high-frequency (UHF) technique. It is observed that the single particle moves in the vertical electrode gap under the DC voltage, and generates UHF signal in the range of 1–3 GHz. At high electric fields, the levitated particle sometime floats in the oil medium and as and when the applied voltage is removed, the particle slowly drops down. When it comes in contact with ground electrode, it generates UHF signals with the frequency content lying in the range of 1–3 GHz. Oil breakdown tests were carried out (without any particle in the oil electrode gap) under DC voltages and fast Fourier transform (FFT) analysis of the signal generated by the UHF sensor because of breakdown indicates that the frequency content of the UHF sensor signal lies up to 1 GHz.

Inspec keywords: HVDC power transmission; transformer oil; power transformer insulation; fast Fourier transforms; transformer testing; insulator contamination; partial discharges

Other keywords: partial discharge activity; ultra-high-frequency; insulation structure; transformer oil; frequency 1 GHz to 3 GHz; high-voltage DC power transmission system; particle contamination; UHF technique; UHF sensor signal; FFT analysis; fast Fourier transform; oil breakdown test; macroscopic conducting particle movement

Subjects: Power line supports, insulators and connectors; d.c. transmission; Dielectric breakdown and discharges; Transformers and reactors; Organic insulation

References

    1. 1)
    2. 2)
      • IEC 60270: ‘High voltage test techniques – partial discharge measurement’ (2000, 3rd edn.).
    3. 3)
    4. 4)
      • A. Beroual , M. Zahn , A. Badent . Propagation of and structure of streamers in liquid dielectrics. IEEE Electr. Insul. Mag. , 6 - 17
    5. 5)
      • Raja, K., Lelaidier, S.: `Experience with UHF partial discharge measurement', Proc. 14th Int. Conf. Dielectric Liquids, 2002, p. 239–241.
    6. 6)
      • F. Carraz , P. Rain , R. Tobazeon . Particle initiated breakdown in quasi uniform field in transformer oil. IEEE Trans. Dielectr. Electr. Insul. , 1052 - 1063
    7. 7)
      • Judd, M.D., Yang, L., Bennoch, C.J.: `UHF diagnostic monitoring techniques for power transformers', EPRI Substation Equipment Diagnostics Conf., 15–18 February 2004, New Orleans, XII, p. 1–18.
    8. 8)
      • National Grid Company plc: ‘Capacitive couplers for UHF partial discharge monitoring’. Technical Guidance Note TGN(T)121, issue 1, January 1997.
    9. 9)
      • S. Deepa , R. Sarathi , A.K. Mishra . Synchronous fluorescence and excitation emission characteristics of transformer oil ageing. Talanta , 811 - 817
    10. 10)
      • Tobazeon, R.: `Charges and discharges of conducting particles in a plane oil gap subjected to a dc voltage', 12thInt. Conf. Conduction and Breakdown in Dielectric Liquids, 1996, p. 309–312.
    11. 11)
      • A. Cavallini , G.C. Montanari , F. Ciani . Analysis of partial discharge phenomena in paper oil insulation system as a basis for risk assessment evaluation. IEEE Int. Conf. Dielectric Liquids , 241 - 244
    12. 12)
      • L. Dascalescu , M. Mihaiescu , R. Tobazeon . Modeling of conductive particle behavior in insulating fluids affected by DC electric fields. IEEE Trans. Ind. Appl. , 1 , 66 - 74
    13. 13)
      • Diabi, R., Fillippini, J.C., Marteau, C., Tobazeon, R.: `On the tole of temperature and impurities in the low field conduction of insulating liquids', Conf. Record of the ICDL'96 12th Int. Conf. Conduction and Breakdown of Dielectric Liquids, July 1996, Roma, Italy, p. 350–353.
    14. 14)
      • M.D. Judd , L. Yang , I.B.B. Hunter . Partial discharge monitoring for power transformers using UHF sensors part-2: field experience. IEEE Electr. Insul. Mag. , 3 , 5 - 13
    15. 15)
      • Tobazeon, R.: `Behaviour of spherical and cylindrical particles in an insulating liquid subjected to a DC uniform field', Conduction and Breakdown in Dielectric Liquids, 1993, ICDL'93’, IEEE 11th Int. Conf. 19–23, 1993, p. 415–420.
    16. 16)
      • Convery, A., Judd, M.D.: `Measurement of propagation characteristics for UHF signals in transformer insulation materials', Proc. 13th Int. Symp. High Voltage Engineering, August 2003, Delft.
    17. 17)
      • W. Kennedy . Recommended dielectric tests and test procedures for converter transformers and smoothing reactors. IEEE Trans. Power Deliv. , 3 , 161 - 166
    18. 18)
      • Krins, M., Borsi, H., Gockenbach, E.: `Influence of carbon particle on the breakdown voltage of transformer oil', 12thInt. Conf. Conduction and Breakdown in Dielectric Liquids (ICDL), 1996, Rome, Italy, p. 296–299.
    19. 19)
      • Meijer, S., Gulski, E., Smit, J.J., Reijnders, H.F.: `Sensitivity check for UHF partial discharge detection in power transformers', Conf. Record of the 2004 IEEE Int. Conf. Electrical Insulation, September 2004, Indianapolis, USA, p. 58–61.
    20. 20)
      • Sarathi, R., Judd, M.D.: `Understanding the partial discharge activity in transformer oil due to particle movement using UHF technique', Int. Conf. Power System, Session-II, December 2007, Bangalore, p. 64–67.
    21. 21)
      • X. Wang , B. Li , Z. Xiao . Acoustic energy shifting in transformer oil at different temperatures. IEEE Trans. Power Deliv. , 2356 - 2359
    22. 22)
      • Pompili, M., Mazetti, C., Bartnikas, R.: `Characteristics of the partial discharge pulse burst in transformer and switch gear oils', Proc. 14th Int. Conf. Dielectrics Liquids, 2002, p. 87–90.
    23. 23)
      • S. Birlasekaran , M. Darveniza . Microdischarges from particles in transformer oil. IEEE Trans. Dielectr. Electr. Insul. , 4 , 162 - 163
    24. 24)
      • T.V. Ommen , E.M. Petrie . Particle contamination levels in oil-filled large power transformers. IEEE Trans. Power Appar. Syst. , 1459 - 1465
    25. 25)
      • Jongen, R.A., Morshuis, P., Meijer, S., Smit, J.J.: `Identification of partial discharge defects in transformer oil', 2005 Ann. Report Conf. Electrical Insulation and Dielectric Phenomena, 2006, p. 565–568.
    26. 26)
      • M. Pompili , C. Mazzetti , R. Bartnikas . Partial discharge pulse sequence patterns and cavity development times in transformer oils under ac conditions. IEEE Trans. Dielectr. Electr. Insul. , 12 , 395 - 403
    27. 27)
      • O. Lesaint , R. Tobazeon . Streamer generation and propagation in transformer oil under AC divergent field conditions. IEEE Trans Electr. Insul. , 941 - 954
    28. 28)
    29. 29)
      • A. Beroual , R. Tobazeon . Prebreakdown phenomena in liquid dielectrics. IEEE Trans. Electr. Insul. , 613 - 627
    30. 30)
      • ‘IEEE Trial use standard general requirements and test code for oil immersed HVDC converter transformers’. IEEE Std C57.129-1999, IEEE, USA.
    31. 31)
      • Rain, P., Tobazeon, R.: `Behaviour of free conducting particle and their role on breakdown in oils under AC and DC voltage', IEEE Sixth Int. Conf. Dielectric Materials, Measurement and Applications, 1992, Manchester, p. 96–99.
    32. 32)
    33. 33)
    34. 34)
      • Zinoulis, T., Argirakis, I., Chadband, W.G., Auckland, D.W.: `The testing of transformer oil using partial discharge techniques', 12thInt. Conf. Conduction and Breakdown in Dielectric Liquids, 1996, p. 385–388.
    35. 35)
      • S. Birlasekaran , W.H. Leong . Comparison of known PD signals with the developed and commercial HFCT sensors. IEEE Trans. Power Deliv. , 1581 - 1590
    36. 36)
      • S. Birlasekaran . The movement of a conductive particle in transformer oil in AC fields. IEEE Trans. Electr. Insul. , 1 , 9 - 17
    37. 37)
      • S. Birlasekaran . The measurement of charge on single particles in transformer oil. IEEE Trans. Electr. Insul. , 6 , 1094 - 1103
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