Publisher : The Korean Institute of Electrical Engineers
DOI : 10.5370/JEET.2010.5.4.631
Title & Authors
Effect of Metallic Particles on E-field Enhancement in Extra High Voltage Gas-insulated Transmission Lines Rao, M. Mohana; Satyanarayana, S.; Kumar, S. Vinay; Jain, H.S.;
Gas-insulated transmission lines (GITL) are valued as technological solutions in hydro-power stations due to their enormous power handling capabilities. The performance of GITL is a function of the size of metallic particles inside the gas-insulated chamber. Electrostatic field (E-field) enhancement is a common phenomenon in gas-insulated lines due to these metallic particles. In this study, the E-field enhancement factor is calculated by considering metallic particles at various locations in the gas-insulated line/bus section, such as high-tension (HT) conductor, high-voltage shields, support insulator, and inner surface of grounded enclosure. For this purpose, a two-dimensional model based on finite element (FE) method is developed. The length of the metallic particle is in the range of 1 to 10 mm while the diameter is between 1 to 3 mm. E-field enhancement is also computed for various particle configurations of the gas-insulated system, with focus on dielectric coating made of epoxy on HT conductor and inner surface of grounded enclosure.
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H. Anis and K.D. Srivastava, “Free conducting particles in compressed gas insulation”, IEEE Tran. Electrical Insulation, Vol. EI-16, No. 4, pp. 327-338, 1981.
H. Parekh, K.D. Srivastava, and R.G. Van Heeswijk, “Lifting field of free conducting particles in compressed SF6 gas with dielectric coated electrodes”, IEEE Tran. Power Apparatus and Systems, Vol. PAS-98, pp. 748-755, 1979.
J.D. Morgan and M. Abdellah, “Impulse breakdown of covered cylinders in SF6-gas mixtures”, IEEE Tran. Electrical Insulation, Vol. EI-23, No. 3, pp. 467-472, 1988.
D. Chee-Hing and K.D. Srivastava, “Insulation Performance of dielectric coated electrodes in sulphur hexafluoride gas”, IEEE Tran. Electrical Insulation, Vol. EI-10, No. 4, pp. 119-124, 1975.
K.S. Prakash, K.D. Srivastava, and M.M. Morcos, “Movement of particles in compressed SF6 gas with dielectric coated enclosure”, IEEE Tran. Dielectrics and Electrical Insulation, Vol. DEI-4, No. 3, pp. 344-347, 1997.
M.M. Morcos, S. Zhang, K.D. Srivastava, and S.M. Gubanski, “Dynamics of metallic particle contaminants in GIS with dielectric coated electrodes”, IEEE Tran. Power Delivery, Vol. PWRD-15, No. 2, pp. 455-460, 2000.
Raymond Bell, Chris Charlson, Shaun Paul Halliday, Terry Irwin, Jose Lopez Roldan, and John Nixon, “High voltage Onsite commissioning Tests for Gas insulated substations using UHF Partial Discharge Detection”, IEEE Tran. Power Delivery, Vol. PWRD-18, No. 4, pp. 1187-1191, 2003.