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access icon free Temperature dependence of the pre-breakdown and breakdown phenomena in natural esters under AC stress

  • Author(s): B. Sékongo 1, 2 ; U. Mohan Rao 2 ; Issouf Fofana 2, 3 ; Marouane Jabbari 3 ; Simplice Akre 2, 4 ; Zie Yeo 4
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  • Source: Volume 14, Issue 9, November 2020, p. 762 – 769
    DOI:  10.1049/iet-smt.2019.0524 , Print ISSN 1751-8822, Online ISSN 1751-8830
© The Institution of Engineering and Technology
Received 19/11/2019, Accepted 04/08/2020, Revised 27/04/2020, Published 14/08/2020

Natural ester dielectric fluids are being used as alternatives for mineral insulating oils in oil-filled power apparatuses. Although partial discharges (PDs) are recognised as one of the main causes of degradation of dielectrics used in power equipment, their characteristic voltages appear to be temperature-dependent. In this contribution, the pre-breakdown and breakdown behaviour of two natural ester fluids, extracted from canola oil (NE1) and soybean oil (NE2) is reported. To assess the effectiveness of the temperature dependence, −5, 0, and + 20°C have been identified as test temperatures. It was found that the different pre-breakdown and breakdown characteristic voltages increase with increasing temperature for both types of esters. The delay time is always longer for canola oil when compared to soybean oil regardless of the test temperature. The analysis of the average propagation velocity of NE1 and NE2 indicates that PDs propagate faster in NE2 than in NE1. The field strength at the tip of the needle electrode during the inception of the streamers leading to breakdown indicates that streamers in both oils are propagating in the slow mode. It is found that the temperature has a significant influence on the PDs’ parameters for both fluids.

Inspec keywords: transformer oil; vegetable oils; partial discharges

Other keywords: canola oil; partial discharges; needle electrode; temperature 0 degC; temperature 20.0 degC; test temperature; field strength; AC stress; power equipment; oil-filled power apparatuses; prebreakdown phenomena; streamers; temperature -5 degC; natural ester dielectric fluids; temperature dependence; breakdown phenomena; soybean oil; propagation velocity; breakdown characteristic voltages

Subjects: Transformers and reactors; Dielectric breakdown and discharges; Organic insulation

References

    1. 1)
      • 19. Dumitrescu, L., Lesaint, O., Bonifaci, N, et al: ‘Study of streamer inception in cyclohexane with a sensitive charge measurement technique under impulse voltage’, J. Electrost., 2011, 53, (2), pp. 135–146.
    2. 2)
      • 5. Rozga, P.: ‘Using the light emission measurement in assessment of electrical discharge development in different liquid dielectrics under lightning impulse voltage’, Electr. Power Syst. Res., 2016, 140, pp. 321–328.
    3. 3)
      • 6. Ghani, S., Muhamad, N.A., Noorden, N., et al: ‘Methods for improving the workability of natural ester insulating oils in power transformer applications: a review’, Electr. Power Syst. Res., 2018, 163, pp. 655–667.
    4. 4)
      • 27. Dang, V.H., Beroual, A., Al-Ammar, E., et al: ‘Streamer propagation in seed based insulating oils under lightning impulse voltages’. ICHVE 2012 – 2012 Int. Conf. High Voltage Engineering Application, Shanghai, China, June 2012, pp. 659–662.
    5. 5)
      • 17. Mohan Rao, U., Fofana, I., Jaya, T., et al: ‘Preliminary study of ester-based fluid for application in transformers serving in cold climatic regions’. Proc. CIGRE Canada Ann. Sess., Montreal, Canada, September 2019, pp. 1–6.
    6. 6)
      • 11. Saha, T.K., Purkait, P.: ‘Investigations of temperature effects on the dielectric response measurements of transformer oil-paper insulation system’, IEEE Trans. Power Deliv., 2008, 23, (1), pp. 252–260.
    7. 7)
      • 24. Wahab, M.A.A., Hamada, M.M., Zeitoun, A.G., et al: ‘Novel modeling for the prediction of aged transformer oil characteristics’, Electr. Power Syst. Res., 1999, 51, (1), pp. 61–70.
    8. 8)
      • 4. Chen, X., Li, J., Lv, Y.: ‘Electrical aging characteristics of natural ester oil-paper insulation respectively considering temperature and moisture’. Proc. IEEE Int. Conf. on High Voltage Engineering and Application, Chengdu, 2016, pp. 1–4.
    9. 9)
      • 28. Przybyłek, P., Gielniak, J.: ‘Concentration analysis of gases formed in mineral oil, natural ester, and synthetic ester by discharges of high energy’, Eksploatacja i Niezawodność, 2018, 20, (3), pp. 435–442.
    10. 10)
      • 7. Unge, M., Singha, S., Dung, V., et al: ‘Enhancements in the lightning impulse breakdown characteristics of natural ester dielectric liquids’, Appl. Phys. Lett., 2013, 102, (17), pp. 1–5.
    11. 11)
      • 16. Dung, N.V., Hoidalen, H.K., Linhjell, D., et al: ‘Effects of reduced pressure and additives on streamers in white oil in long point-plane gap’, J. Phys. D. Appl. Phys., 2013, 25, pp. 1–16.
    12. 12)
      • 29. Lu, W., Liu, Q.: ‘Effect of cellulose particles on impulse breakdown in ester transformer liquids in uniform electric fields’, IEEE Trans. Dielectr. Electr. Insul., 2015, 22, (5), pp. 2554–2564.
    13. 13)
      • 10. Fofana, I.: ‘50 years in the development of insulating liquids’, IEEE Electr. Insul. Mag., 2013, 29, (5), pp. 13–25.
    14. 14)
      • 3. Mohan Rao, U., Fofana, I., Rozga, P., et al: ‘A review on pre-breakdown phenomena in ester fluids’, IEEE DEIS Study Gr. Artic. IEEE Trans. Dielectr. Electr. Insul., 2020, (In press).
    15. 15)
      • 8. Muslim, J., Lesaint, O., Hanna, R., et al: ‘Streamer generation and propagation in dibenzyltoluene and ester liquids under high temperature’. Proc. IEEE Int. Conf. on Dielectric Liquids, Roma, Italy, 2019, pp. 1–4.
    16. 16)
      • 22. Beroual, A., Zahn, M., Badent, A., et al: ‘Propagation and structure of streamers in liquid dielectrics’, IEEE Electr. Insul. Mag., 1988, 14, (2), pp. 6–17.
    17. 17)
      • 14. Aka-Ngnui Beroual, A., Perrier, C.: ‘Pre-breakdown phenomena in synthetic ester and silicone oils for power transformers’. Proc. Int. Conf. on Dielectric Liquids, FC, France, 2008, pp. 1–4.
    18. 18)
      • 9. Bourkas, P.D., Karagiannopoulos, C.G., Agoris, D.P., et al: ‘Temperature effects on partial discharges in the combined system of a solid-liquid dielectric during lightning impulse voltage’. Proc. IEEE Int. Symp. on Electrical Insulation, Arlington, USA, 1998, vol. 2, pp. 631–635.
    19. 19)
      • 13. Yamada, H., Sato, T.: ‘High-speed electro-optical measurement of pre-breakdown current in dielectric liquids’, IEEE Trans. Electr. Insul., 1985, EI-20, (2), pp. 261–267.
    20. 20)
      • 26. Chandrasekar, S., Montanari, G.C.: ‘Analysis of partial discharge characteristics of natural esters as dielectric fluid for electric power apparatus applications’, IEEE Trans. Dielectr. Electr. Insul., 2014, 21, (3), pp. 1251–1259.
    21. 21)
      • 20. Lesaint, O.: ‘Streamers in liquids: relation with practical high voltage insulation and testing of liquids’. Proc. IEEE Int. Conf. on Dielectric Liquids, FC, France, 2008, pp. 1–6.
    22. 22)
      • 12. Stanek, M., Rozga, P., Rapp, K.: ‘Comparison of lightning characteristics of selected insulating synthetic esters with mineral oil’. Proc. Int. Conf. on Dielectric Liquids, Manchester, UK, 2017, pp. 1–4.
    23. 23)
      • 18. Hestad, O.L., Ingebrigsten, S., Lundgaard, L.E.: ‘Streamer initiation in cyclohexane, Midel 7131 and Nytro 10X’. Proc. IEEE Int. Conf. on Dielectric Liquids, Coimbra, Portugal, 2005, pp. 123–126.
    24. 24)
      • 2. Fernández, I., Ortiz, A., Delgado, F., et al: ‘Comparative evaluation of alternative fluids for power transformers’, Electr. Power Syst. Res., 2013, 98, pp. 58–69.
    25. 25)
      • 30. Rozga, P.: ‘Streamer propagation in a non-uniform electric field under lightning impulse in short gaps insulated with natural ester and mineral oil’, Bull. Pol. Acad. Sci. Tech. Sci., 2016, 64, (1), pp. 171–179.
    26. 26)
      • 15. Top, T.V., Massala, G., Lesaint, O.: ‘Streamer propagation in mineral oil in semi-uniform geometry’, IEEE Trans. Dielectr. Electr. Insul., 2002, 9, (1), pp. 76–82.
    27. 27)
      • 1. Mohan Rao, U., Fofana, I., Jaya, T., et al: ‘Alternative dielectric fluids for transformer insulation system: research progress, challenges, and future prospects’, IEEE Access, 2019, 7, pp. 1–20.
    28. 28)
      • 23. Lewis, T.J.: ‘A new model for the primary process of electrical breakdown in liquids’, IEEE Trans. Dielectr. Electr. Insul., 1988, 5, (3), pp. 306–315.
    29. 29)
      • 25. Fofana, I., Bouaïcha, A., Hadjadj, Y., et al: ‘Early stage detection of insulating oil decaying’. Proc. IEEE Int. Conf. on Electrical Insulation Dielectric Phenomena, West Lafayette, IN, 2010, pp. 1–4.
    30. 30)
      • 21. Kattan, R., Denat, A., Lesaint, O.: ‘Generation, growth, and collapse of vapor bubbles in hydrocarbon liquids under a high divergent electric field’, J. Appl. Phys., 1989, 66, (9), pp. 4062–4066.
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