Application of functionally graded material for reducing electric field on electrode and spacer interface

Kurimoto, Muneaki; Katō, K.; Hanai, Masahiro; Hoshina, Yoshikazu; Takei, Masafumi; Ōkubo, H.

doi:10.1109/tdei.2010.5412025

Cited by 121 publications

(55 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thickness of the top and bottom parts was 0.5 mm, and that of the middle part was 2 mm. A laminated solid insulator used in this experiment was fabricated based on the similar principle of other researchers [8][9][10] that the flashover voltage was raised by controlling permittivity distribution inside insulator. However, these other studies [8][9][10] presented a single new material consisted of three layers with different permittivity distribution.…”

Section: Laminated Solid Insulatormentioning

confidence: 99%

“…This could produce additional cost for researching and manufacturing new materials. In addition, the permittivity of the new material used in these studies [8][9][10] was higher than that of spacer used in the Gas Insulated Switchgears (GIS). Therefore, this paper presented stacking well-known laminated materials whose permittivity range is within that of spacer currently used in the GIS.…”

Section: Laminated Solid Insulatormentioning

confidence: 99%

“…In particular, the surface discharge of the triple junction can be generated more easily when the electric field intensity is higher. Studies [8][9][10] have been conducted to mitigate the triple junction electric field using solid-insulator permittivity or by increasing the flashover voltage. Kato et.…”

Section: Introductionmentioning

confidence: 99%

“…al. [9] constructed a Functionally Graded Material (FGM) using a centrifugal force to control the permittivity distribution of solid insulators. The FGM spacer was composed of two or three layers.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Surface Discharge Characteristics Study on the Laminated Solid Insulator in Quasi-Uniform Electric Field with Dry Air

Min¹,

Bae²,

Kang³

et al. 2015

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

-Dry air is an excellent alternative to SF 6 gas and is used as an insulation gas in Ecofriendly Gas Insulated Switchgears (EGISs), which has gained popularity in industry. Solid insulators in EGIS play an important role in electrical insulation. On the other hand, surface discharge can occur easily when solid insulators are used. This paper explored the surface discharge characteristics on the structure of three-layered laminated solid insulators to elevate the flashover voltage. A laminated solid insulator was inserted after the quasi-uniform electric field was formed in the test chamber. Dry air was then injected to set the internal pressure to 1 ~ 6 atm, and the AC voltage was applied. When identical solid insulators were stacked, the surface discharge characteristics were similar to those of a single solid insulator. On the other hand, the flashover voltage rose when the middle part was thicker and had lower permittivity than the top and bottom parts in the laminated solid insulator. Based on experimental results, when stacking a solid insulator in three layers, the middle part of the solid insulator should be at least four times as thick as the top and bottom parts and have lower permittivity than the others. In addition, the flashover voltage increased with increasing gas pressure on the surface of the laminated solid insulator due to the gas effect. This study may allow insulation design engineers to have useful information when using dry air for the insulation gas where the surface discharge can occur.

show abstract

Section: Laminated Solid Insulatormentioning

confidence: 99%

Section: Laminated Solid Insulatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Surface Discharge Characteristics Study on the Laminated Solid Insulator in Quasi-Uniform Electric Field with Dry Air

Min¹,

Bae²,

Kang³

et al. 2015

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

show abstract

“…Recent studies on insulating material treatment tend to focus on the modifications of bulk insulating material [1][2][3], which lead to changes in the properties of the bulk, as well as the surface layer, and consequently its interface properties with electrode. However, little attention has been given to modifications limited to surface properties alone by directly treating the surface layer of polymeric insulation.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms for surface potential decay on fluorinated epoxy in high voltage DC applications

Mohamad

Chen

Zhang

et al. 2014

2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

View full text Add to dashboard Cite

Abstract-Epoxy resin has been extensively used for decades as an insulation material in high voltage transmission systems. However, this insulation material does suffer from bulk and surface charging when used as insulating spacer, mainly in high voltage DC applications. By applying fluorination treatment, the surface of polymeric insulation is chemically treated and so modifies charge transport characteristics of the material. In doing so, excellent surface properties can be obtained without compromising the bulk characteristics of the polymeric insulation. In this paper, the authors investigate the surface potential decay performance of non-fluorinated and fluorinated epoxy resin samples. The surface decay performance of insulating material is a crucial parameter in dissipating accumulation of surface and bulk charge that can lead to premature breakdown of the insulating material. The epoxy samples were characterised by Energy Dispersive X-Ray (EDX) analysis to determine the changes in chemical composition of the samples before and after fluorination treatment. Surface potential decay measurement using positive corona discharging was then performed, followed by bulk DC conductivity measurement to further explain the mechanisms which govern the surface potential decay. The existence of surface-fluorinated layer on the treated samples had been found to play a major role in dictating the movement of charges away from the surface during the decay process. The influence of fluorination treatment on the decay mechanisms was discussed.

show abstract

Polymer Composites for Switchgears

Imai

2021

Polymer Composites for Electrical Engineering

View full text Add to dashboard Cite

Application of functionally graded material for reducing electric field on electrode and spacer interface

Cited by 121 publications

References 10 publications

Surface Discharge Characteristics Study on the Laminated Solid Insulator in Quasi-Uniform Electric Field with Dry Air

Surface Discharge Characteristics Study on the Laminated Solid Insulator in Quasi-Uniform Electric Field with Dry Air

Mechanisms for surface potential decay on fluorinated epoxy in high voltage DC applications

Polymer Composites for Switchgears

Contact Info

Product

Resources

About