New technology for medium voltage solid insulated switchgear

Sato, Junichi; Sakaguchi, Osamu; Kubota, Nobutaka; Makishima, Shoji; Kinoshita, Susumu; Shioiri, T.; Yoshida, Tsuneo; Miyagawa, Masaru; Homma, M.; Kaneko, E.

doi:10.1109/tdc.2002.1177727

Cited by 33 publications

(21 citation statements)

References 6 publications

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“…In these days, most of the medium voltage switchgears are the cubicle-type low pressure SF6 gas insulated switchgears (C-GIS). However, SF6 gas was designated as one of the targets of emission control in the global warming prevention conference held in 1997 (COP3), then research and development of SF6 gas free systems are advanced actively [1][2][3][4][5][6]. In the medium voltage class, the switchgears insulated with high pressure air or nitrogen has been developed [3] On the other hand, research and development of technological components aiming for the realization of a full solid insulated substation is advanced actively in the extra high voltage class.…”

Section: Introductionmentioning

confidence: 99%

Improvement of insulation performance of solid/gas composite insulation with embedded electrode

Yamashita

Iwanaga

Furusato

et al. 2016

IEEE Trans. Dielect. Electr. Insul.

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Solid insulated switchgear (SIS) has been developed as a substitution for medium voltage sulfur hexafluoride (SF6) gas insulated switchgears. Its main circuit including a vacuum interrupter is coated with epoxy resin. Therefore, a solid/gas insulation system is composed. For further miniaturization and higher stress design of SIS, improvement of the insulation performance is required. In the solid/gas insulation system, the breakdown strength along the surface is lower than that of solid. Then, the authors investigated the surface insulation performance of the solid/gas insulation system containing an embedded electrode. In the present study, the sizes of the embedded electrode and the solid insulation material were varied and the partial discharge inception voltage and the surface breakdown voltage were measured. As a result, it was found that the surface breakdown voltage varied considerably with the radius of the embedded electrode. From the result, it was deduced that the surface insulation performance could be improved by choosing the size of the embedded electrode appropriately. Moreover, the effects of the thickness of the insulation material and of the surface distance on the surface insulation performance were clarified.

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Section: Introductionmentioning

confidence: 99%

Improvement of insulation performance of solid/gas composite insulation with embedded electrode

Yamashita

Iwanaga

Furusato

et al. 2016

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

show abstract

“…However, SF6 gas was designated as one of the targets of emission control in the global warming prevention conference held in 1997. Then, research and development of SF6 gas free systems were actively advanced [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the situation mentioned above, a solid insulated switchgear (SIS) has been developed [2]. The main circuits of SIS including a vacuum interrupter are coated with epoxy resin.…”

Section: Introductionmentioning

confidence: 99%

Estimation of surface breakdown voltage of solid/gas composite insulation with embedded electrode

Yamashita

Iwanaga

Furusato

et al. 2016

IEEE Trans. Dielect. Electr. Insul.

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Solid insulated switchgear (SIS) has been developed as a substitution for medium voltage SF6 gas insulated switchgear. Its main circuits including a vacuum interrupter are coated with epoxy resin, therefore, a solid/gas insulation system is formed. For further miniaturization and higher stress design of SIS, the authors investigated on the surface insulation of the solid/gas insulation system containing an embedded electrode. In the present study, the surface breakdown voltage was estimated based on the surface discharge propagation characteristics. From the measurement of the surface flashover voltage on a dielectric against the surface distance, the relation between the surface flashover voltage and the surface distance was found to be expressed with an equation derived from the empirical equation presented by Toepler. Then, the surface breakdown voltage was estimated based on the obtained equation. The estimated values were compared with the experimental data obtained varying a parameter of the radius of the embedded electrode, thickness of the epoxy resin plate or the radius of the plate. As a result, a good correlation was obtained. Therefore, the estimation method of the surface breakdown voltage on the solid/gas insulation with embedded electrode was established.

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“…These insulators are fabricated from molding resins used with insert materials such as metals and ceramics (1)- (2) . Depending on the combination of insert materials and resins, cracks and interface debonding may occur at the edge of their interface, where stress is concentrated because of the difference in the thermal contraction between the insert material and resin.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Strength of Adhesive Interface between Ceramic and Resin in Resin-Molded Structures

Yamazaki

Iwasaki

2011

JMMP

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For the stabilization of insulation performance in resin-molded insulators, strong adhesion between the resin and ceramic is required. In this paper, a new technique for the control of the interfacial strength in resin-molded structures has been proposed. The adhesive strength of the internal interface in a resin-molded structure was estimated as the interfacial fracture energy by using the molecular dynamics method. The interfacial fracture energy was qualitatively in agreement with the adhesive strength index obtained by a shear experiment. Based on the simulation results, the control of the interfacial strength was performed, and it became clear from the result that the interfacial strength between resin and ceramic can be improved up to the strength level of the glaze adhesion.

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New technology for medium voltage solid insulated switchgear

Cited by 33 publications

References 6 publications

Improvement of insulation performance of solid/gas composite insulation with embedded electrode

Improvement of insulation performance of solid/gas composite insulation with embedded electrode

Estimation of surface breakdown voltage of solid/gas composite insulation with embedded electrode

Evaluating Strength of Adhesive Interface between Ceramic and Resin in Resin-Molded Structures

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