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Effect of Gas-Mixture Ratio on the Characteristics of Positive DC Corona Discharge in SF6/N2 Gas Mixtures
- Source :
- IEEE Transactions on Dielectrics and Electrical Insulation. 28:829-837
- Publication Year :
- 2021
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2021.
-
Abstract
- The characteristics of positive DC corona discharge in SF 6 /N 2 gas mixtures under different gas-mixture ratios are investigated with a needle-to-plane electrode configuration. With increasing applied voltage, a discharge-stage transition process including the Townsend stage, streamer-pulse stage, brush-pulse stage and breakdown stage is observed. The variation in current-pulse characteristics, including pulse-time parameters, mean pulse amplitude and pulse-repetition rate, is investigated under different gas-mixture ratios. The pulse-time parameters are not affected by gas-mixture ratio. The pulse-repetition rate increases with the increase of SF 6 concentration and mean current, ranging from hundreds of kilohertz to thousands of kilohertz. The streamer-pulse amplitude increases with increasing SF 6 concentration. With increasing mean current, the small-amplitude brush pulses become dominant, thus the mean pulse amplitude decreases. In order to further explore the influence mechanism of gas-mixture ratio on positive corona discharge, a fluid model of positive corona discharge is developed and relevant simulations show the formation process of current pulse, and verify the validity of the pulse characteristics changing with gas-mixture ratio.
- Subjects :
- 010302 applied physics
Materials science
01 natural sciences
Sulfur hexafluoride
Corona (optical phenomenon)
chemistry.chemical_compound
Amplitude
chemistry
0103 physical sciences
Electrode
Breakdown voltage
Stage (hydrology)
Electrical and Electronic Engineering
Current (fluid)
Atomic physics
Corona discharge
Subjects
Details
- ISSN :
- 15584135 and 10709878
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Dielectrics and Electrical Insulation
- Accession number :
- edsair.doi...........da0bcdfc8376df98b042c17a1c4ab09b