Partial Discharge Characteristics of SF6 and SF6/N2 in Nonuniform Electric Field Under Negative DC Voltage

Han, Xutao; Zhang, Xuanrui; Wang, Haotian; Sun, Youhong; Yang, Zhou; Li, Junhao

doi:10.1109/tdei.2022.3208512

Cited by 7 publications

(1 citation statement)

References 31 publications

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“…For instance, Jee and Lim [8] analyzed the surface discharge process in a sphere-plate electrode and discussed the discharge propagation modes at high and low pressures based on discharge images and typical electrical characteristics. In the studies of needle-plate discharge under a positive excitation by Hou et al [9] and rod-plate discharge under a negative excitation by Pang et al [10], it is found that the discharge current amplitudes and time resolved pulse sequences in these two discharges are quite different, so it comes to the conclusion that the voltage polarity significantly affects the particle dispersion in surface discharge. Due to the nanosecond time scale of the discharge evolution, discharge images with high temporal and spatial precision are indispensable for understanding the discharge mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Simulation comparison of the positive and negative surface discharges induced by metal particles in a plate–surface–plate structure under DC excitation in atmospheric air

Jiang,

Lai,

Gong

et al. 2024

J. Phys. D: Appl. Phys.

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Surface discharge induced by metal particles is a common insulation failure in many high-voltage equipment. In order to further understand the mechanisms of this surface discharge, a 2D simulation model of a plate-surface-plate structure with a pin is established and verified by experiments in this paper to simulate the actual discharge configurations, and the evolution characteristics of the positive and negative surface discharges are compared. The evolutions of both positive and negative discharges could be divided into two phases: the bridging phase and the expansion phase. As the electric field in the gap between the streamer and the dielectric surface is strengthened by the effect of the space charge, the ionization sources and the secondary electrons excited on the dielectric surface, the dielectric surface presents attraction to the streamer, and subsequently the two streamer routes first touch the dielectric surface and then arrive at the grounding electrode. However, the channel branching is the most distinctive characteristic of the positive and negative discharges. In the positive discharge, the channel first branches, then merges, and finally expands, and the gaps of pin to dielectric surface and pin to grounding electrode are broken down by two slender positive branches, respectively. The negative discharge presents a stout channel without branching, which develops and expands simultaneously. This is ascribed to the thinner space charge layer, the weaker shielding effect of the internal electric field and the more active movement of the internal charges in the positive discharge. Another important factor for the discharge branching is the appropriate matching of the sheath thickness and the curvature radius of the channel's head.

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Section: Introductionmentioning

confidence: 99%