Performance of Negative Corona in Wire-meshed Cylinder Configurations
M. Abdel-Salam1, S. El-Debeiky2, S. El-Khodary2, and M. Mostafa2
1Department of Electrical Engineering, Assiut University, Egypt
2Department of Electrical Power Engineering, Ein-Shams University, Egypt
Abstract- This paper is aimed at evaluating the electric field, the negative corona onset voltage and the corona current in wire-meshed cylinder and wire-solid cylinder configurations of finite length. Charge simulation technique is used for calculating the electric field between the wire and the outer cylinder. The onset voltage is calculated based on the calculated field and the criterion for self-recurring single electron-avalanches in the ionization-zone around the wire surface. The corona current-voltage characteristics are measured for the configurations with different wire radii. The calculated corona onset voltage values agreed reasonably with those measured experimentally. The corona currents with wire-meshed cylinder are lower than those with a wire-solid cylinder configuration; even the corona onset voltage for the wire- meshed cylinder is lower than that for wire-solid cylinder.
Keywords- Meshed electrode, onset voltage, negative corona, mesh cylinder