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Distribution of the Electric Field in 35-kV Current Leads with Solid Insulation

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Abstract

The effect of different design solutions on the short- and long-term dielectric strength of cast epoxy insulation has been considered. The electrical strength for 35-kV conductors in the longitudinal and cross sections has been calculated. The correspondence of structures of conductors and couplings to the permissible threshold values of the electric-field intensity has been found. The calculations for graded insulation of 35-kV conductors have been performed. The electric-field grading in insulation systems allows one to decrease the distribution range of electric-field intensity along the total length of multilayer insulation by almost 2.5 times. It has been shown that the optimal number of layers for a 35-kV conductor is six.

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REFERENCES

  1. Varivodov, V.N., Internal insulation of gas-filled of high- and ultrahigh-voltage equipment, Doctoral (Eng.) Dissertation, Moscow: Lenin All-Russian Electrotechnic Inst., 2000.

  2. Kolechitskii, E.S., Raschet elektricheskikh polei ustroistv vysokogo napryazheniya (Analysis of Electric Fields of High-Voltage Equipment), Moscow: Energoatomizdat, 1983.

  3. Shevchenko, S.Yu. and Okun’, A.A., Analysis of calculation methods of electric fields of high-voltage equipment, Elektrotekh. Elektromekh., 2010, no. 4, pp. 59–62.

  4. Varivodov, V.N., Kovalev, D.I., Krupenin, N.V., and Khrenov, S.I., Permissible electrical-field intensities in the epoxy cast insulation of a 6- to 110-kV switchgear, Russ. Electr. Eng., 2018, vol. 89, no. 5, pp. 294–297.  https://doi.org/10.3103/S1068371218050115

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Funding

The work on the development of innovative current conductors for a rated voltage of 6–110 kV at National Research University “Moscow Power Engineering Institute” was supported by the Ministry of Science and Higher Education of the Russian Federation.

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Authors and Affiliations

  1. National Research University “Moscow Power Engineering Institute”, 111250, Moscow, Russia

    D. I. Kovalev, V. N. Varivodov, D. V. Golubev & E. M. Voronkova

  2. OOO EnergoTekhRazvitie, 111024, Moscow, Russia

    V. A. Romanov

Authors
  1. D. I. Kovalev
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  2. V. N. Varivodov
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  3. D. V. Golubev
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  4. E. M. Voronkova
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  5. V. A. Romanov
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Corresponding author

Correspondence to D. I. Kovalev.

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The authors declare that they have no conflicts of interest.

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Translated by M. Astrov

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Kovalev, D.I., Varivodov, V.N., Golubev, D.V. et al. Distribution of the Electric Field in 35-kV Current Leads with Solid Insulation. Russ. Electr. Engin. 93, 211–214 (2022). https://doi.org/10.3103/S106837122204006X

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  • DOI: https://doi.org/10.3103/S106837122204006X

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