Charge Accumulation and Dielectric Characteristics of DC-GIS

Yoshida, Yoshio; Yamaji, K.; Sampei, M.; Ibuki, K.

doi:10.1007/978-1-4899-1295-4_94

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…In the insulation design of a gassolid composite insulation system which typically included in gas insulated switchgears (GIS) and a gas insulated transmission line (GIL), etc., the insulation technique on the gas-solid interface heavily becomes important as well as the insulation both in gas gap and inside the spacer. In the insulation of a gas-solid interface, we have to consider various factors, like contamination particles, voids, cracks, E-field intensification at triple junction and charging on the spacer surface, as schematically illustrated in Figure 1, as well as the electric field (E-field) distribution on the spacer surface with a perfectly pure condition [1][2]. For these reasons, the spacer insulation in the practical gas insulated switchgears, are made improved by various techniques in Figure 1, for examples, controlling the spacer shape, additional shielding electrodes for relaxation of E-field, and the introduction of thin layer made of a low conductivity material on the spacer surface [3].…”

Section: Introductionmentioning

confidence: 99%

Application of functionally graded material for solid insulator in gaseous insulation system

Katō

Kurimoto

Shumiya

et al. 2006

IEEE Trans. Dielect. Electr. Insul.

135

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Functionally graded materials (FGM) have spatial distribution of a material property in order to achieve efficient stress control. An application of the FGM to a solid insulator (spacer) for a gaseous insulation system, like gas insulated switchgear, is expected to improve electric field (Efield) distribution around the spacer.In this paper, we describe the applicability of the FGM spacer to gas insulated power equipment. In the FGM spacer, we gave spatial distribution of dielectric permittivity to control the E-field distribution inside and outside the spacer. This paper includes following key results for the applications of the FGM. Firstly, E-field simulation results when applying the FGM by a finite element method are presented, in which we show the effective reduction of the maximum field strength by applying the FGM. Next, a fabrication technique of the FGM spacer sample with not only step-by-step but also continuous changes of permittivity is presented by use of centrifugal force. Finally, dielectric breakdown tests using FGM samples which are accurately controlled the spatial distribution of permittivity are carried out under lightning impulse voltage applications. The test result indicates the increase of breakdown voltage (BDV). From these results, we verified the applicability and the fabrication technique of FGM spacer for improvement of the dielectric strength in the gaseous insulation system.

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Section: Introductionmentioning

confidence: 99%