Fabrication and simulation of permittivity graded materials for electric field grading of gas insulated power apparatus

Hayakawa, Naoki; Ishiguro, Junya; Kojima, H.; Katō, K.; Ōkubo, H.

doi:10.1109/tdei.2015.005237

Cited by 80 publications

(26 citation statements)

References 11 publications

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“…The analysis of electric field stress in GIB, where it was mainly observed that the efficiency of insulation ability over spacers can be enhanced by different techniques, such as shape regulation, the addition of shield electrodes, embedded electrodes, etc. However, these spacer design approaches have very limited influence over the distribution of electric field in the spacer and as a consequence, a new methodology called Functionally Graded Material (FGM) filled with specific permittivity materials has been described by few authors [12][13][14] in order to resolve the difficulties of the previous methods and to make them more economical. Some researchers [15][16][17] have stated that this is the latest technique of FGM design of spacer, has certain difficulties in processing, construction, and so on.…”

Section: Introductionmentioning

confidence: 99%

Study of electric field stress on the surface contour and at the triple junction in three phase GIS with FGM spacer under the depression defect

Pakalapati¹,

Gundavarapu

Duvvada³

et al. 2020

International Journal of Emerging Electric Power Systems

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Now days, the establishment of spacers is in wide usage in three-phase Gas Insulated Busduct (GIB) for providing mechanical support and better insulation to the conductors. The region of the intersection of SF6 gas, enclosure end and the spacer is one of the weakest links in GIB, so the major concentration is done on minimization of electric field stress at this junction by using Functionally Graded Material (FGM) technique. The other incidents of insulation failures are due to several defects like depression, delamination etc. reduces the dielectric strength of the spacers. In this paper, an FGM post type spacer has been designed for a three-phase GIB under depression and further electric field stress at Triple Junction (TJ) is reduced by introducing a metal insert (MI) nearer to the TJ. Several filler materials are used as doping materials for obtaining different permittivity values using FGM technique to achieve uniform electric field stress. Simulation is carried out for the designed spacer at various operating voltages with different types of FGM gradings. The effect of depression with different dimensions and positions is analyzed before and after inserting MI to the FGM post type spacer in three-phase GIB.

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Section: Introductionmentioning

confidence: 99%

Study of electric field stress on the surface contour and at the triple junction in three phase GIS with FGM spacer under the depression defect

Pakalapati¹,

Gundavarapu

Duvvada³

et al. 2020

International Journal of Emerging Electric Power Systems

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“…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 .…”

Section: Introductionmentioning

confidence: 99%

“…Gradient permittivity distribution can be realized through controlling density distribution of ceramic particles (alumina, titanium oxide, etc.) that have higher relative permittivity than epoxy resin . However, microscopic field enhancement exists around high‐permittivity ceramic particles.…”

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%

“…that have higher relative permittivity than epoxy resin. 2,5,8,10,12,13 However, microscopic field enhancement exists around high-permittivity ceramic particles. It is not yet clear whether this field enhancement adds to field distribution on the surface of permittivitygraded materials.…”

Section: Introductionmentioning

confidence: 99%

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

Kurimoto

Ozaki

Sawada

et al. 2018

Elect Comm in Japan

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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.

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Polymer Composites for Electric Stress Control

Kurimoto

2021

Polymer Composites for Electrical Engineering

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Fabrication and simulation of permittivity graded materials for electric field grading of gas insulated power apparatus

Cited by 80 publications

References 11 publications

Study of electric field stress on the surface contour and at the triple junction in three phase GIS with FGM spacer under the depression defect

Study of electric field stress on the surface contour and at the triple junction in three phase GIS with FGM spacer under the depression defect

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

Polymer Composites for Electric Stress Control

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