Suppression of Metallic Particle Lift-off in GIS by Nonlinear Resistivity Coating

Nojima, K.; Zhang, Xueqin; Matsuzaki, Hidehito; Ando, Hiroki; Shiiki, Motoharu; Takei, Masafumi

doi:10.1541/ieejpes.132.952

Cited by 4 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the metal particles under the bare electrode, the potential φ satisfies the following equation [7]

({, \begin{aligned} \nabla^{2} φ = 0 \\ φ_{HVE} = V_{0} \\ φ_{GE} = 0 \\ φ_{p} = 0 \end{aligned})

In the formula (10),

φ_{HVE}

and

φ_{GE}

are the potentials of the upper and lower electrodes, respectively, and Γ represents the boundary of the metal particles. For the metal particles on the coated electrode, the initial charge quantity of the metal particles is 0 pC, and the potential φ satisfies the following equation [16, 17]

({, \begin{aligned} \nabla^{2} φ = 0 \\ φ_{HVE} = V_{0} \\ φ_{GE} = 0 \\ \int_{Γ} D \cdot d S = 0 \end{aligned})

In order to compare the difference of the electric field distribution surrounding metal particles of the bare electrode and that of the coated electrode, the lift‐off voltage of the metal particles under SF 6 gas at 0.15 MPa pressure is taken as an example, which the electric field strength of the parallel plates electrodes gap is 4.80 × 106 V/m.…”

Section: Mechanism Analysis Of Dielectric Coated Electrodes To Suppmentioning

confidence: 99%

Effect mechanism of dielectric‐coated electrodes on metal particle lift‐off in SF ₆ gas

Zhan

Lü

Liu

et al. 2018

J. eng.

View full text Add to dashboard Cite

“…For the metal particles under the bare electrode, the potential φ satisfies the following equation [7]

({, \begin{aligned} \nabla^{2} φ = 0 \\ φ_{HVE} = V_{0} \\ φ_{GE} = 0 \\ φ_{p} = 0 \end{aligned})

In the formula (10),

φ_{HVE}

and

φ_{GE}

({, \begin{aligned} \nabla^{2} φ = 0 \\ φ_{HVE} = V_{0} \\ φ_{GE} = 0 \\ \int_{Γ} D \cdot d S = 0 \end{aligned})

Section: Mechanism Analysis Of Dielectric Coated Electrodes To Suppmentioning

confidence: 99%

Effect mechanism of dielectric‐coated electrodes on metal particle lift‐off in SF ₆ gas

Zhan

Lü

Liu

et al. 2018

J. eng.

View full text Add to dashboard Cite

“…Nonlinear-resistance material was also applied inside a GIS tank a Correspondence to: Takeshi Iwata. E-mail: takeshi.iwata.mw@hitachi.com Hitachi, Ltd., 7-1-1, Omika-cho, Hitachi-shi Ibaraki, 319-1292, Japan to prevent the floating of small metal particles [4,5]. The purpose of this study was to improve the dielectric strength of insulators by coating the nonlinear-resistance material on the insulator surface when a metal particle adheres to the insulator.…”

Section: Introductionmentioning

confidence: 99%

“…In another research, the electric field was mitigated by applying a nonlinear resistance material to the triple junction of the high‐voltage conductor [3]. Nonlinear‐resistance material was also applied inside a GIS tank to prevent the floating of small metal particles [4,5]. The purpose of this study was to improve the dielectric strength of insulators by coating the nonlinear‐resistance material on the insulator surface when a metal particle adheres to the insulator.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Study of Spacer‐Insulation‐Performance Improvement by Nonlinear‐Resistance Material

Iwata,

Nukaga,

Rokunohe

2023

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

Coating the surface of insulators used in a gas‐insulated switchgear (GIS) with nonlinear‐resistance material is expected to increase breakdown voltage by reducing the electric‐field concentration when metal particles adhere to the insulators. In this study, an epoxy resin with zinc oxide was used as a nonlinear‐resistance material. Tensile strength, adhesion by heat cycle test, hardness, and resistance to decomposition products of sulfur hexafluoride gas were evaluated for the nonlinear‐resistance material. It was confirmed that there were no problems with mechanical properties for application to GIS. The nonlinear‐resistance material was spray‐coated on actual post spacers, and the breakdown voltage was evaluated when metallic particles adhered to the post spacers. When the coating thickness was 20–35 μm, the breakdown voltage increased by about 8%. When the coating thickness was 50– 68 μm, however, the breakdown voltage increased by 23%, confirming that the breakdown voltage of an actual spacer improved. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

show abstract

“…However, in many cases, the resulting nonlinear index is insufficient, either due to precipitation of the filler or a lack of electrical contact between these particles. Interestingly, because nonlinear resistive effects occur at the crystal grain boundaries (GBs) of the filler particles, particles having numerous such GBs may function as microvaristors, and this effect has been studied previously …”

Section: Introductionmentioning

confidence: 99%

Nonlinear resistivity in epoxy composites containing Mn‐based ferrite magnetic particles

Matsuzaki

Suzuki

Naka

et al. 2019

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

In this study, magnetic particles were employed as nonlinear resistive materials in electric stress grading composites. Epoxy resin films containing either manganese-based ferrite magnetic (Mn-FM) particles or manganese-magnesium-based ferrite magnetic particles were prepared, and the threshold voltages required for these films to exhibit nonlinear resistivity were determined. The sample containing Mn-FM particles having irregular shapes [Mn-FM(i)] at 20 vol % showed the highest nonlinear resistivity. Assessments of the magnetic characteristics of these materials demonstrated a relationship between magnetic flux density and nonlinear resistivity. The magnetic flux density of the Mn-FM(i) composite was the highest among the various specimens, indicating that magnetic flux density may affect nonlinear resistivity.

show abstract

Suppression of Metallic Particle Lift-off in GIS by Nonlinear Resistivity Coating

Cited by 4 publications

References 7 publications

Effect mechanism of dielectric‐coated electrodes on metal particle lift‐off in SF ₆ gas

Effect mechanism of dielectric‐coated electrodes on metal particle lift‐off in SF ₆ gas

Fundamental Study of Spacer‐Insulation‐Performance Improvement by Nonlinear‐Resistance Material

Nonlinear resistivity in epoxy composites containing Mn‐based ferrite magnetic particles

Contact Info

Product

Resources

About

Suppression of Metallic Particle Lift-off in GIS by Nonlinear Resistivity Coating

Cited by 4 publications

References 7 publications

Effect mechanism of dielectric‐coated electrodes on metal particle lift‐off in SF 6 gas

Effect mechanism of dielectric‐coated electrodes on metal particle lift‐off in SF 6 gas

Fundamental Study of Spacer‐Insulation‐Performance Improvement by Nonlinear‐Resistance Material

Nonlinear resistivity in epoxy composites containing Mn‐based ferrite magnetic particles

Contact Info

Product

Resources

About

Effect mechanism of dielectric‐coated electrodes on metal particle lift‐off in SF ₆ gas

Effect mechanism of dielectric‐coated electrodes on metal particle lift‐off in SF ₆ gas