電気学会論文誌A(基礎・材料・共通部門誌)
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
最新号
選択された号の論文の13件中1~13を表示しています
特集:未来社会に向けた先端光応用・視覚技術
特集解説論文
特集論文
論文
  • -その4-
    笹森 健次, 羽馬 洋之
    2020 年 140 巻 8 号 p. 407-416
    発行日: 2020/08/01
    公開日: 2020/08/01
    ジャーナル 認証あり

    This paper is the fourth report of gas-insulated switchgear (GIS) history (basically after 2000s to present) in Japan from a view point of transitions of the technological developments and practical applications. Firstly, technical progress of 550 kV GIS especially focused on from 1990s to 2010s was summarized referring to an application example of 550 kV mixed technology switchgear (MTS). Application of MTS to 550 kV GIS made it possible to reduce the weight of equipment and SF6 gas. An example of refurbishment of aged 550 kV switchgear to the latest one was also presented. Secondly, deterioration phenomena and their issues for aged GIS were studied regarding gaskets and contacts (e.g. contact wear and grease). Also, a replacement example of aged GCB by using the latest MTS was introduced as one of life extension methods for aged GIS. Finally, transition of GIS developments and the practical applications over a half of century were reviewed by classifying into four terms. Recent trends of SF6 alternative gas and the related international activities in CIGRE and IEC were introduced. Also, features of GIS technologies in Japan were compared with those of overseas GIS in terms of e.g. design, manufacturing, testing techniques and the way to establish and update GIS specifications and standards.

  • 坂本 和也, 阿邊 槙之介, 川島 朋裕, 穂積 直裕, 村上 義信, 塩田 裕基, 門脇 和丈
    2020 年 140 巻 8 号 p. 417-422
    発行日: 2020/08/01
    公開日: 2020/08/01
    ジャーナル 認証あり

    To understand the electrical treeing properties at an interface, treeing breakdown tests are performed using a 1/2 needle polished to half the original thickness. The treeing properties of multilayer samples, which have interfaces similar to Epoxy (EP)/EP-1/2n and Glass/EP-1/2n, are measured. The average tree inception voltage of the EP/EP-1/2n sample is higher than that of the Glass/EP-1/2n sample. The magnitude relationship of the bonding strengths between the EP/EP-1/2n and Glass/EP-1/2n samples is the same as that of the tree inception voltage. The insulation lifetime of the EP/EP-1/2n sample is also higher than that of the Glass/EP-1/2n sample. These results suggest that the interface becomes the weak point for electrical insulation, and the weak bonding of the interface may lower the treeing properties.

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