Motion analysis of spherical metal particle in AC gas-insulated lines: random effects and resistance of the SF<sub>6</sub>/N<sub>2</sub> mixture

Wang, Jian; Li, Qingmin; Li, Botao; Chen, Chao; Liu, Sihua; Ji, Hongxin

doi:10.1109/tdei.2016.7736819

Cited by 30 publications

(16 citation statements)

References 17 publications

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“…It would experience the friction resistance in the horizontal direction and roll along the electrode surface until it is lifted off at some point. The dynamic friction resistance, f d , satisfies [24, 25]

f_{normald} = μ_{normald} ()(, G - F_{q} \cos θ_{0})

where µ d represents the friction coefficient.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The velocity after particle collision can be approximately expressed as [25, 26]

({, \begin{matrix} 1em4pt \\ v_{2 z} = - k_{r} v_{1 z} \frac{\cos α_{2} \cos δ}{\cos ψ \cos β 2} \\ v_{2 x} = k_{r} v_{1 x} \frac{\cos α_{2} \sin δ}{\sin ψ \cos β_{2}} \end{matrix})

where v 1 z and v 1 x refer to the vertical and horizontal velocities before the collision, respectively; v 2 z and v 2 x refer to the velocities after the collision, respectively; α 2 represents the incidence angle whereas β 2 represents the reflection angle after the collision; ψ refers to the angle between the velocity and the vertical direction before the collision, which is equal to ψ = arctan ( v 1 x /v 1 z ), and δ represents the angle between the velocity and the vertical direction after collision.…”

Section: Mathematical Modelmentioning

confidence: 99%

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Motion behaviour of metallic particle under diverging conducting electrode considering the random collision and reflection

Sun

Luo

Liu

et al. 2020

IET Science, Measurement &Amp; Technology

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An improved model for the motion dynamics of a metallic particle located in the non-uniform electric field area in the gas insulated system is proposed. To represent the special area, a diverging conducting electrode is used in this study. Based on the fluid mechanics theory, the forces imposed on metallic particle are first developed. The motion process is then divided into two modes, i.e. the particle rolls on the electrode surface and moves in the gap. The collision and reflection processes between the particle and the electrode are crucial to the motion, and they are fully considered in the proposed model. The trajectory of the particle under different voltages is obtained. The evolution of metallic particle is divided into four stages, and it is featured by four quantities, i.e. the critical jumping point, the minimum horizontal position, the falling point, and the motion time. The characteristics for each stage are analysed, and the sensitivity analysis of the quantities are performed. The impacts of the applied voltage, the particle radius, the initial position etc. are discussed. The results provide guidance for particle trap design.

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f_{normald} = μ_{normald} ()(, G - F_{q} \cos θ_{0})

where µ d represents the friction coefficient.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The velocity after particle collision can be approximately expressed as [25, 26]

({, \begin{matrix} 1em4pt \\ v_{2 z} = - k_{r} v_{1 z} \frac{\cos α_{2} \cos δ}{\cos ψ \cos β 2} \\ v_{2 x} = k_{r} v_{1 x} \frac{\cos α_{2} \sin δ}{\sin ψ \cos β_{2}} \end{matrix})

Section: Mathematical Modelmentioning

confidence: 99%

Motion behaviour of metallic particle under diverging conducting electrode considering the random collision and reflection

Sun

Luo

Liu

et al. 2020

IET Science, Measurement &Amp; Technology

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“…The simulation is done in the condition that the break is in the open state and the conductivity of EP and SF 6 are very low (3.33 × 10 −18 and 1 × 10 −16 S/m, respectively), so the temperature gradient in the circuit breaker due to current is ignored and the value of μ SF 6 is assumed to be constant. The magnitude of F v imposed on the particle is expressed as [10]…”

Section: Motion Of the Metallic Particlementioning

confidence: 99%

“…where σ is the yield stress of the wall, Y is the equivalent elastic modulus, ζ is the coefficient of the friction between the particle and the wall, α is the incident angle, E Y1 and E Y2 are Young's modulus of the wall and the particle, respectively, υ 1 and υ 2 are Poisson's ratio of the wall and the particle, respectively. In the case when the particle collides with the insulator, regardless of the randomness, reflection angle β is calculated as [10] tan…”

Section: Collision Between Particle and Wallmentioning

confidence: 99%

“…In the case when the particle collides with the Cu electrode whose surface roughness is considered, as shown in Fig. 2, reflection angle β is calculated as [22] β = arctan(k n tan α) + ξΔγ (18) where ξ represents a random variable from −1 to 1; Δγ represents the random reflection angle due to the surface roughness whose value is set to be 10° [10].…”

Section: Collision Between Particle and Wallmentioning

confidence: 99%

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

Sima

Shao

Sun

et al. 2019

IET Science, Measurement & Technology

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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.

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Fabrication and Evaluation of Field-Adaptive Insulator for DC-GIL Application

Du¹,

Liang²

2022

Epoxy-Based Spacers for Gas Insulated Power Apparatus

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Motion analysis of spherical metal particle in AC gas-insulated lines: random effects and resistance of the SF₆/N₂ mixture

Cited by 30 publications

References 17 publications

Motion behaviour of metallic particle under diverging conducting electrode considering the random collision and reflection

Motion behaviour of metallic particle under diverging conducting electrode considering the random collision and reflection

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

Fabrication and Evaluation of Field-Adaptive Insulator for DC-GIL Application

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Motion analysis of spherical metal particle in AC gas-insulated lines: random effects and resistance of the SF6/N2 mixture

Cited by 30 publications

References 17 publications

Motion behaviour of metallic particle under diverging conducting electrode considering the random collision and reflection

Motion behaviour of metallic particle under diverging conducting electrode considering the random collision and reflection

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

Fabrication and Evaluation of Field-Adaptive Insulator for DC-GIL Application

Contact Info

Product

Resources

About

Motion analysis of spherical metal particle in AC gas-insulated lines: random effects and resistance of the SF₆/N₂ mixture

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