Dynamic motion characteristics of a spherical copper particle in the break of SF ₆ HVDCCB

Abstract

The development of high-voltage direct current circuit breaker (HVDCCB) has progressed rapidly. One of the major reasons for the failure of a circuit breaker is the metallic particle contamination. An enhanced mathematical model is proposed to simulate the motion dynamics of a spherical copper particle in the break of sulphur hexafluoride (SF 6 ) HVDCCB. By linking COMSOL and MATLAB, the interaction between particle motion and electric field distribution and plastic random movement in the collision process is considered. The effects of voltage magnitude and particle size on the particle motion are discussed. By means of statistical methods, the obtained findings show that, as voltage magnitude decreases or particle size increases, the particle-anode collision frequency decreases, and the particle-anode collision region increases in the x-direction but decreases in the y-direction. The accuracy of the proposed model is verified by experimental observations via high-speed video camera.

Effect of metal-submicron-particle accumulation on the stability of consecutive high-pulse-power breakdowns in compressed N2

“…They found that free particles were more prone to provoke breakdowns, which could be further transformed from coronal discharges to spark discharges at higher applied voltages. In addition, many studies have focussed on the dynamic properties of particles: You et al [18] and Sima et al [19] obtained theoretical values for charge quantity and electric-field lift as a function of particle size and shape. Moreover, several simulation models [20][21][22] have been developed, which consider dimension, charge polarity, and electromagnetic force to analyze the dynamic characteristics of particles and how they affect breakdowns.…”

Effects of metal fluoride/sulfide microparticles generated by consecutive high-pulse-power breakdowns on the insulating performance in compressed SF6

“…Many theoretical models [15][16][17][18] have also been developed to simulate the movement of spherical particles under DC or AC voltage. It was observed that owing to field emission (FE) or electron capture, the charge transfer played a significant role in causing the oscillating behavior of the particles.…”