Vacuum insulator coating development

Roth, I.; Sincerny, P.; Mandelcorn, L.; Mendelsohn, Morris A.; Smith, Debra; Engel, T.G.; Schlitt, L.; Cooke, C. M.

doi:10.1109/ppc.1997.679391

Cited by 23 publications

(8 citation statements)

References 1 publication

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“…In order to obtain the SEE characteristics of low energy incident electrons in LDPE/Al 2 O 3 nanocomposites, the experimental data were fitted through changing δ m and E p m based on equation (18). E p m is unchanged at low loadings and increases at high loadings (5 wt% and 10 wt%).…”

Section: -8mentioning

confidence: 99%

Enhanced flashover strength in polyethylene nanodielectrics by secondary electron emission modification

Wang

Min

2016

AIP Advances

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This work studies the correlation between secondary electron emission (SEE) characteristics and impulse surface flashover in polyethylene nanodielectrics both theoretically and experimentally, and illustrates the enhancement of flashover voltage in low-density polyethylene (LDPE) through incorporating Al2O3 nanoparticles. SEE characteristics play key roles in surface charging and gas desorption during surface flashover. This work demonstrates that the presence of Al2O3 nanoparticles decreases the SEE coefficient of LDPE and enhances the impact energy at the equilibrium state of surface charging. These changes can be explained by the increase of surface roughness and of surface ionization energy, and the strong interaction between nanoparticles and the polymer dielectric matrix. The surface charge and flashover voltage are calculated according to the secondary electron emission avalanche (SEEA) model, which reveals that the positive surface charges are reduced near the cathode triple point, while the presence of more nanoparticles in high loading samples enhances the gas desorption. Consequently, the surface flashover performance of LDPE/Al2O3 nanodielectrics is improved.

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Section: -8mentioning

confidence: 99%

Enhanced flashover strength in polyethylene nanodielectrics by secondary electron emission modification

Wang

Min

2016

AIP Advances

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“…The fillers were treated by 3 Aminopropyltrithoxy Silane (KH-550) coupling agent and fumed silicas (Degussa, Aerosil380, D50=7nm) as the thixotropic agent were mixed in order 1-4244-0750-8/07/$20.00 ©2007 IEEE. to preventing the fillers sedimentation.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The voltage holdoff capability of a solid insulator in vacuum is usually less than that of a vacuum gap of similar dimensions. The vulnerable area is the surface of the insulator, since its bulk voltage holdoff capability normally is better than that of a similar-sized vacuum gap [1][2][3]. The flashover holdoff voltage of insulators depends upon many insulator parameters and electrode parameters, such as material [4], geometry, surface finish, treatments to electrodes etc.…”

Section: Introductionmentioning

confidence: 99%

Experiments and Simulations on Influencing Factors of Pulsed Surface Flashover in Vacuum

Chen

Cheng

Tang

et al. 2007

2007 IEEE International Conference on Solid Dielectrics

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The pulsed flashover strength of epoxy composite material in vacuum is related to the vacuum level, the electrode material, the relative dielectric constant, and the surface charging quantity of the sample. By using a high power single pulse generator (65ns rise time, 600ns half-height pulse width time and 10-4Pa ultimate vacuum level), the vacuum surface flashover characteristics of epoxy and epoxy/A1203*3H20 composite material are studied by using the fingertype electrode with different materials (brass, duralumin and stainless steel). In the case of stainless steel-stainless steel fingertype electrode system, the flashover experiments under different vacuum level are investigated. Based on the ANSOFT Maxwell 3D software, E-field distribution of the electrode system, the effect of the relative dielectric constant of the sample on the maximum value of E-field magnitude and the role of surface charging of the sample on the maximum value of E-field magnitude are simulated and discussed.

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“…In the point of the conventional insulation design, increasing E f means the enhancement of the total insulation performance of the vacuum/solid composite insulators. However, in practice, the breakdown of solid dielectrics in the vacuum/solid insulators can also cause the total insulation to fail (Roth et al, 1997;Chantrenne et al, 1999;Zhao et al, 2010). These phenomena can be understood from the perspective of reliability.…”

Section: Introductionmentioning

confidence: 99%

A Method to design composite insulation structures based on reliability for pulsed power systems

Zhao

Zhang

et al. 2014

Laser Part. Beams

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A method to design the composite insulation structures in pulsed power systems is proposed in this paper. The theoretical bases for this method include the Weibull statistical distribution and the empirical insulation formula. A uniform formula to describe the reliability (R) for different insulation media such as solid, liquid, gas, vacuum, and vacuum surface is derived. The dependence curves of the normalized applied field on R are also obtained. These curves show that the normalized applied field decreases rapidly as R increases but the declining rates corresponding to different insulation media are different. In addition, if R is required to be higher than a given level, the normalized applied field should be smaller than a certain value. In practical design, the common range of the applied fields for different insulation media should be chosen to meet a global reliability requirement. In the end, the proposed method is demonstrated with a specific coaxial high-voltage vacuum insulator.

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Vacuum insulator coating development

Cited by 23 publications

References 1 publication

Enhanced flashover strength in polyethylene nanodielectrics by secondary electron emission modification

Enhanced flashover strength in polyethylene nanodielectrics by secondary electron emission modification

Experiments and Simulations on Influencing Factors of Pulsed Surface Flashover in Vacuum

A Method to design composite insulation structures based on reliability for pulsed power systems

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