Electric field control by permittivity functionally graded materials and their lightning impulse withstand voltages for surface breakdown

Hayashi, Noriyuki; Kawahara, Kouichi; Sumikura, Mitsuhiro; Hara, Masanori; Endo, Fumio

doi:10.1109/elinsl.2002.995927

Cited by 11 publications

(11 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Spacers using permittivity‐graded materials offer electric field control functions contributing to more compact device design through field relaxation at triple junctions of spacer/insulating gas/electrode, field leveling at spacer surface, field relaxation at spacer/electrode interface, and so on. These effects were clarified in electric field simulations and insulation breakdown tests using spacer models …”

Section: Introductionmentioning

confidence: 99%

“…Gradient permittivity distribution can be continuous or discrete (stepped). Permittivity‐graded materials with stepped gradient distribution can be fabricated relatively easily through lamination of materials with different permittivity . However, stepped change of permittivity around lamination interface causes local field enhancement; when such field enhancement is strong, required insulation performance is not necessarily obtained.…”

Section: Introductionmentioning

confidence: 99%

“…These effects were clarified in electric field simulations and insulation breakdown tests using spacer models. [2][3][4]6,9 Gradient permittivity distribution can be continuous 3,5,7,8,[10][11][12][13] or discrete (stepped). Permittivitygraded materials with stepped gradient distribution can be fabricated relatively easily through lamination of materials with different permittivity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

FEM simulation of local field enhancement close to lamination interface of permittivity‐graded material

Kurimoto

Ozaki

Sawada

et al. 2018

Elect Comm in Japan

View full text Add to dashboard Cite

For size reduction of gas insulated switchgears (GIS), application of permittivity‐graded material to insulating spacer has been studied. The electric‐field‐enhancement close to the lamination interface of the permittivity‐graded material obtained by laminating epoxy composites with different permittivities was investigated. The FEM simulation revealed that the increase of the layer number of the permittivity‐graded material could reduce the field enhancement close by the lamination interface, even when considering electric field distortion near the individual high‐permittivity particles filled in each layer.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

FEM simulation of local field enhancement close to lamination interface of permittivity‐graded material

Kurimoto

Ozaki

Sawada

et al. 2018

Elect Comm in Japan

View full text Add to dashboard Cite

show abstract

“…(6) indicates that the axial position of the particle exponentially increased with time, and largely depended on the parameter c/b, namely on η, D 2 , and ω 2 . The time T L , by which a particle reaches at x(T L ) = L from x 0 , is calculated from Eq.…”

Section: X(t) X 0 Exp C B T · · · · · · · · · · · · · · · · · · · · ·mentioning

confidence: 99%

Fabrication of Functionally Graded Epoxy Resin with Alumina Fillers and its Simulation by Using a Centrifugal Method

Hayashi

Tsuru²,

Onoda³

et al. 2004

IEEJ Trans. FM

View full text Add to dashboard Cite

Functionally graded materials that had gradient profiles of permittivity (i.e., ε-FGMs) were fabricated from an alumina/epoxy mixture by a centrifugal method. Gradient distribution of both the packing fraction and size of the dispersed alumina fillers was confirmed by SEM images. Furthermore, a new numerical method to simulate the fabrication process was proposed based on the movement of solid particles dispersed in the viscous liquid under the centrifugal operation. In the simulation, both the cumulative probability of the practical filler diameter and the existence and growth of the fully-packed layer were taken in account. Permittivity profiles in ε-FGM was calculated and compared with the experimental ones, resulting in reasonable agreement between them. Therefore, it is concluded that the simulation method proposed can be applied to model the similar process of fabricating FGMs by the centrifugal method. The gradient of the fillers is intentionally regulated not only by changing in both the velocity and/or duration of the centrifugal operation, but also by changing in the distribution of filler size. In particular, existence of fillers with various sizes is indispensable to attain and control the centrifugal process because the fillers, depending on their sizes, play different roles in determining the profiles of packing fraction and resultant permittivity.

show abstract

“…To decrease force disturbances and the cable mass, the operating voltage of the actuators is increased to above 2000 V. As a result, partial discharges occur during the expected lifetime of an inverter-fed actuator [1]. To ensure that the linear actuators reach their expected lifetime, electric field control methods have to be employed as is performed in cable accessories of medium and high-voltage networks [2][3][4][5] and high-voltage rotating machines [6][7][8]. These electric field control methods mitigate electric field stress and, therefore, ensure the partial discharge inception voltage is above the operating voltage.…”

Section: Introductionmentioning

confidence: 99%

Analysis of electric field control methods for foil coils in high-voltage linear actuators

Beek¹,

Jansen²,

Lomonova³

2015

Archives of Electrical Engineering

View full text Add to dashboard Cite

This paper describes multiple electric field control methods for foil coils in high-voltage coreless linear actuators and their sensitivity to misalignment. The investigated field control methods consist of resistive, refractive, capacitive and geometrical solutions for mitigating electric stress at edges and corners of foil coils. These field control methods are evaluated using 2-D boundary element and finite element methods. A comparison is presented between the field control methods and their ability to mitigate electric stress in coreless linear actuators. Furthermore, the sensitivity to misalignment of the field control methods is investigated.

show abstract

Electric field control by permittivity functionally graded materials and their lightning impulse withstand voltages for surface breakdown

Cited by 11 publications

References 4 publications

FEM simulation of local field enhancement close to lamination interface of permittivity‐graded material

FEM simulation of local field enhancement close to lamination interface of permittivity‐graded material

Fabrication of Functionally Graded Epoxy Resin with Alumina Fillers and its Simulation by Using a Centrifugal Method

Analysis of electric field control methods for foil coils in high-voltage linear actuators

Contact Info

Product

Resources

About