- Volume 5 Issue 4
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Effect of Metallic Particles on E-field Enhancement in Extra High Voltage Gas-insulated Transmission Lines
- Rao, M. Mohana (Bharat Heavy Electricals Limited, Corporate R&D) ;
- Satyanarayana, S. (Bharat Heavy Electricals Limited, Corporate R&D) ;
- Kumar, S. Vinay (Bharat Heavy Electricals Limited, Corporate R&D) ;
- Jain, H.S. (Bharat Heavy Electricals Limited, Corporate R&D)
- Received : 2010.02.02
- Accepted : 2010.07.21
- Published : 2010.11.01
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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