Barrier effect on breakdown of point–plane oil gaps under alternating current voltage

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Barrier effect on breakdown of point–plane oil gaps under alternating current voltage

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Published

This study deals with the influence of insulating barriers on AC dielectric strength of transformer oil in point–plane electrode configuration. The influence of the characteristics of barrier such as its position with regard to the point electrode, its thickness and dimension as well as its constituting material is investigated. It is shown that the insertion of barrier near the point electrode generally leads to the increase of breakdown voltage; this later also increases with the dimensions of barrier. The optimal position of barrier is at about 20% of gap starting from the sharp electrode (i.e. the point). The barrier acts as a geometrical obstacle against the direct propagation of discharge. There is an equivalency between distances of systems with barrier and without barrier.

Inspec keywords: electric breakdown; transformer oil

Other keywords: breakdown; alternating current voltage; transformer oil; point-plane oil gaps; barrier effect; AC dielectric strength

Subjects: Organic insulation; Inductors and transformers; Dielectric breakdown and discharges

References

    1. 1)
    2. 2)
      • N.F. Wolochtchenko . Problems concerning the mechanism of the barrier effect. Elektritchestwo
    3. 3)
      • Beroual, A., Zouaghi, A.: `Barrier effect on the prebreakdown and breakdown phenomena in long oil gaps', Record ICDL 96 12th Int. Conf. on Conduction and Breakdown in Dielectric Liquids, 15–19 July 1996, Roma, Italy, p. 300–303.
    4. 4)
      • Fofana, I., Beroual, A., Boubakeur, A.: `Influence of insulating barriers on positive long air gaps in divergent field', High Voltage Engineering Symp., 22–27 August 1999, p. 321–324.
    5. 5)
      • Derler, F., Kirch, J., Krause, C.H., Schneider, E.: `Development of a design method for insulating structures exposed to electric stress in long oil gaps and along oil/transformer board interfaces', paper 21.16, Seventh Int. Symp. on High Voltage Engineering, Dresden, Germany, p. 73–76, 1991.
    6. 6)
    7. 7)
      • Ming, L., Leijon, M., Bengtsson, T.: `Factors influencing barrier effects in air-gaps', paper 2168, Ninth ISH, 1995, Graz, Austria.
    8. 8)
      • Norme internationale: Isolants liquides- Détermination de la tension de claquage à fréquence industrielle. Méthode d'essai, deuxième édition, CEI 156, 1995.
    9. 9)
      • A. Boubakeur . Influence des barrières sur l'amorçage des moyens intervalles d'air pointe – plan. Rozprawy Elektrotechniczne , 3 , 729 - 744
    10. 10)
      • A. Beroual , A. Zouaghi . Barrier effect on prebreakdown and breakdown phenomena in long oil gaps under lightning impulse voltages. Arch. Electr. Eng. , 305 - 321
    11. 11)
      • A. Beroual , A. Boubakeur . Influence of barriers on the lightning and switching impulse strength of mean air gaps in point–plane arrangements. IEEE Trans. Electr. Insul. , 6
    12. 12)
      • Zouaghi, A., Beroual, A.: `Discharge structure and dielectric strength of long oil gaps in the presence of insulating barrier', IEEE Conf. on Electrical Insulation and Dielectric Phenomena, 19–22 October 1997, Minneapolis, p. 660–663.
    13. 13)
      • S.A. Studniarz . The effect of barriers in the low field regions of non-uniform fields on oil breakdown. IEEE Trans. Power Appar. Syst. , 4 , 1568 - 1573
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