Characteristics of Negative Corona Discharge in Single-Needle- and Multi-Needle-to-Plane Configurations

M. Abdel-Salam1, A. Hashem2, and E. Sidique3

1Department of Electrical Engineering, Assiut University, Egypt
2Department of Physics, Faculty of Science, Assiut University, Egypt
3Department of Science and Math, Faculty of Education at New Valley, Assiut University, Egypt

Abstract- This paper investigates the characteristics of corona discharge in single-needle- and multi-needle-to-plane configurations including the onset voltage and the current-voltage relationship and their dependency on the number of needles, the needles' height, the needles' tip radius, the needle-to-needle spacing and the spacing between needles and the ground plate. The onset voltage is measured in the lab and calculated based on the criterion of self-recurrence of electron avalanches growing in the vicinity of the needles when stressed negatively. This calls for calculating the electric field in the vicinity of the needles using the charge simulation method. The calculated onset voltage values agree reasonably with those measured experimentally. The corona current-voltage characteristics have been studied experimentally to assess how the total corona current in multi-needle configurations is influenced by the number of needles, the needle-to-needle spacing and the spacing between needles and the ground plate.

Keywords- Onset voltage, corona discharge, corona current, electric field, electron avalanche, single and multineedle configurations



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