期刊
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
卷 28, 期 3, 页码 771-779出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TDEI.2021.009315
关键词
Electrodes; Insulation; Analytical models; Surface discharges; Sulfur hexafluoride; Ionization; Surface charging; composite insulation; electron avalanche; secondary electron emission; photoionization; SF6; streamer; surface discharge
资金
- Kangwon National University
This paper investigates the surface discharge characteristics under different gas pressures in N2/02 mixed gas with a Teflon dielectric sphere-plane electrode, identifying different discharge paths at high and low pressures. Proposes two surface discharge models based on mechanisms such as electron avalanche, photoionization, and photoemission.
This paper presents the surface discharge characteristics with changes in gas pressure under a sphere-plane electrode with a Teflon dielectric in N2/02 mixed gas (80:20) and focuses on interpreting the surface discharge mechanism at both high pressure (0.3-0.6 MPa) and low pressure (0.1-0.2 MPa). The partial discharge and surface flashover voltages are measured under AC high voltage between 0.1 and 0.6 MPa of the N2/02 mixture gas. It is clearly observed that two surface discharge paths are revealed with the pressure change in the N2/02 mixed gas. In the high pressure case, the surface discharge path develops from the cathode-triple junction to a Teflon surface, and in the low pressure case, the path passes through the bulk gas at the sphere-electrode surface away from the triple junction and then advances to the Teflon surface. Surface discharge models for these two patterns are proposed based on surface discharge mechanisms including electron avalanche, photoionization, photoemission, electron attachment, electron detachment, and dielectric charging.
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