Dynamics of a metallic particle bouncing between alternating high voltage electrodes

Park, Kijun; Goo, Sun-Geun; Yoon, Jin-Yul; Kye, Won-Ho; Kwon, Tae-Yoon; Rim, Seog-Hoon; Kim, Chil-Min; Park, Young-Jai

doi:10.1063/1.1590429

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…The diameter and the length of the acicular metal particle are 0.2 mm and 10 mm, respectively. These shapes and sizes of the metal particles were chosen since they well represent the typical shapes and sizes of metal particles in DC GIL 18 . During the experiment, the metal particles were placed at a horizontal distance of 0 mm and 10 mm from the bottom of the model spacer.…”

Section: Experimental Descriptionsmentioning

confidence: 99%

Metal particle induced spacer surface charging phenomena in direct current gas-insulated transmission lines

Xing

Sun

Yang

et al. 2021

J. Phys. D: Appl. Phys.

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The interpretation of the surface charge pattern of spacers in gas-insulated transmission lines (GIL) is a crucial and important research topic, which requires a comprehensive understanding of charge behaviors at physical interfaces. Here, we report a surface charging phenomenon of spacers in presence of metal particles inside the direct current (DC) GIL. The charging of spherical metal particle on the spacer surface appears as dotted discontinuously distributed charge spots which are due to the charge injection from the induced charge of the metal particle and gas ionization over the metal particle surface. Concentrically distributed bipolar charge patterns are seen to build up, which are due to the surface trapping of charges from gas ionization at the end tip of the acicular metal particle. The lateral type of ionization obeys the law of dielectric barrier discharge of the needle-plate electrode at an intense DC electric field, which may bring significant influence on the safety of the spacer. The study in this letter provides direct evidence demonstrating the surface charge patterns of spacers in the presence of metal particles, which serves as an important basis in the design of DC GIL.

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Section: Experimental Descriptionsmentioning

confidence: 99%

Metal particle induced spacer surface charging phenomena in direct current gas-insulated transmission lines

Xing

Sun

Yang

et al. 2021

J. Phys. D: Appl. Phys.

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“…The diameters of aluminum balls are 0.5 mm, 1 mm, 2 mm, aluminum blocks are irregular block particles with diameters of 0.5 mm, 1 mm, 2 mm as circumscribed balls; aluminum wires are 0.5 mm in diameter, 5 mm in length, 10 mm, 15 mm cylindrical particles. These types of metal particles were chosen because they are a good representation of the typical shape and size of metal particles in DC GIL [19]. For each test, 2 g of metal particles were placed on the bottom of the GIL cavity and 400 mm away from the spacer.…”

Section: Experimental Setup and Samplementioning

confidence: 99%

Particle behavior and trap design for ±320 kV gas-insulated power transmission line (GIL)

Zhuang

Liang

et al. 2023

J. Phys. D: Appl. Phys.

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The movement of metal particles in the electric field of the DC gas-insulated transmission line (GIL) may cause local electric field distortion on the surface of the insulator, which seriously affects the operation stability of GIL. In this paper, based on a ±320 kV GIL platform, the movement characteristics of metal particles (aluminum blocks, aluminum wires, aluminum balls) inside the GIL are studied. The suppression effect of particle activity for particle trapping and surface coating are experimentally studied in DC electric field. The relationship between particle trap porosity and particle suppression effect are discussed and verified with experiments. The research results show that under negative voltage, the minimum take-off voltage of metal particles in ±320 kV GIL is -190 kV, which is far lower than the steady-state operating voltage of GIL. Once the spherical and blocky particles take off, they will continue to reciprocate rapidly between the conductors. When the block particles are close to the insulator, they might be attracted and adsorbed on the surface of the insulator. Metal wires after taking off tends to show “firefly" movement near the high-voltage conductor. The coating has a significant effect on increasing the take-off electric field of metal particles. It is verified that the traditional AC GIL particle trap is not effective in inhibiting particles in DC voltage. The suppression of the DC GIL particle is positively related to the porosity of the particle trap to a certain extent. The conclusions of this paper can be reference for the development of future stable and reliable DC gas-insulated equipment.

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Optimal control in a noisy system

Asenjo

Toledo

Muñoz

et al. 2008

Chaos: An Interdisciplinary Journal of Nonlinear Science

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We describe a simple method to control a known unstable periodic orbit (UPO) in the presence of noise. The strategy is based on regarding the control method as an optimization problem, which allows us to calculate a control matrix A. We illustrate the idea with the Rossler system, the Lorenz system, and a hyperchaotic system that has two exponents with positive real parts. Initially, a UPO and the corresponding control matrix are found in the absence of noise in these systems. It is shown that the strategy is useful even if noise is added as control is applied. For low noise, it is enough to find a control matrix such that the maximum Lyapunov exponent lambda(max)<0, and with a single non-null entry. If noise is increased, however, this is not the case, and the full control matrix A may be required to keep the UPO under control. Besides the Lyapunov spectrum, a characterization of the control strategies is given in terms of the average distance to the UPO and the control effort required to keep the orbit under control. Finally, particular attention is given to the problem of handling noise, which can affect considerably the estimation of the UPO itself and its exponents, and a cleaning strategy based on singular value decomposition was developed. This strategy gives a consistent manner to approach noisy systems, and may be easily adapted as a parametric control strategy, and to experimental situations, where noise is unavoidable.

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Dynamics of a metallic particle bouncing between alternating high voltage electrodes

Cited by 4 publications

References 10 publications

Metal particle induced spacer surface charging phenomena in direct current gas-insulated transmission lines

Metal particle induced spacer surface charging phenomena in direct current gas-insulated transmission lines

Particle behavior and trap design for ±320 kV gas-insulated power transmission line (GIL)

Optimal control in a noisy system

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