Effect of permittivity variation on surface flashover of GIS epoxy spacer model in SF&lt;inf&gt;6&lt;/inf&gt; gas

Matsuoka, Norikazu; Fuchi, Yuki; Kozako, Masahiro; Hikita, Masayuki

doi:10.1109/icd.2016.7547552

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…Comparing the results by material highlights the effect that the relative permittivity of the solid spacer had on certain tests. Under negative polarity, the performance of the system was shown to follow the assumption of higher flashover strengths for lower permittivity [17], [18]. This behavior was observed for all three levels of RH and all three levels of pressure, as evident from Fig.…”

Section: A Materialssupporting

confidence: 51%

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Impulsive Flashover Characteristics and Weibull Statistical Analysis of Gas-Solid Interfaces With Varying Relative Humidity

et al. 2020

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This paper informs on the flashover strength of three materials: Delrin (polyoxymethylene), HDPE (high-density polyethylene) and Ultem (polyetherimide) with smooth surface finishes, in zero-grade air at −0.5, 0 and 0.5 bar gauge, and at <10%, ~50% and >90% relative humidity (RH). Both negative and positive polarity impulse voltages were applied to investigate the potentially asymmetrical electrical performance of the geometrically-symmetrical electrode arrangement. In all tests, high voltage (HV) impulses with a nominal 100/700 ns wave-shape were applied. Each test conformed with the ASTM D3426-97 standard of 'step up' testing, to find the average flashover voltage for each set of conditions. For negative polarity, each solid dielectric material demonstrated a decrease in flashover voltage as the RH was increased. For positive polarity, however, the flashover voltages were similar for all levels of RH, with the exemption of HDPE. A decrease in flashover voltage was found as the permittivity of the material increased for negative polarity, irrespective of humidity and pressure. Overall, the highest flashover voltage recorded for negative polarity was ~200 kV with an HDPE spacer, at 0.5 bar gauge and <10% RH. The poorest performance was for a Delrin spacer in negative polarity, at −0.5 bar gauge and >90% RH, at a value of ~53 kV. For positive polarity, the highest flashover voltage was for a Delrin spacer at ~50% RH and 0.5 bar gauge, with a voltage of ~180 kV; the lowest flashover voltage of ~60 kV was recorded with an HDPE spacer, at −0.5 bar gauge and >90% RH.

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Section: A Materialssupporting

confidence: 51%

“…bars do overlap. This decrease in flashover voltage is due to the field enhancement associated with increasing relative permittivity of the spacer material, resulting in lower flashover voltages [17], [18]. Under positive polarity, however, the same effect was not observed.…”

Section: A Materialsmentioning

confidence: 92%

Impulsive Flashover Characteristics and Weibull Statistical Analysis of Gas-Solid Interfaces With Varying Relative Humidity

et al. 2020

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“…The relative permittivity could reflect the polarisation properties of the sample, and the change of the microcosmic group can be visualised by the change of the relative permittivity. It is indicated that the GIS spacer with lower permittivity had a higher surface flashover pulse voltage [26]. Fig.…”

Section: Sample Characteristicsmentioning

confidence: 94%

Carrier mobility and trap distribution dependent flashover characteristics of epoxy resin

Jin

et al. 2017

IET Generation, Transmission & Distribution

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“…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. However, they have come up with a remedy by producing an FGM spacer with three separate forms of gradings, such as increasing, decreasing, and U form of permitting ranges by utilizing centrifugal forces.…”

Section: Introductionmentioning

confidence: 99%

“…But for a three-phase GIB, as all the conductors inside GIB are spaced at equidistant [25]. It is necessary to consider the symmetrical system, i.e., d AB = d BC = d CA = d and Equations 14and (16) can then be written as,…”

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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Effect of permittivity variation on surface flashover of GIS epoxy spacer model in SF<inf>6</inf> gas

Cited by 8 publications

References 5 publications

Impulsive Flashover Characteristics and Weibull Statistical Analysis of Gas-Solid Interfaces With Varying Relative Humidity

Impulsive Flashover Characteristics and Weibull Statistical Analysis of Gas-Solid Interfaces With Varying Relative Humidity

Carrier mobility and trap distribution dependent flashover characteristics of epoxy resin

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

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