JPH05292633A - Gas insulated electric machine - Google Patents

Abstract

PURPOSE:To provide a gas insulated electric machine having simple structure and excellent insulation performance in which a metallic foreign matter is restricted from moving, while bounding, between a conductive part and a metallic container. CONSTITUTION:In a gas insulated electric machine wherein elongated conductive parts 2, 3 are laid longitudinally in a cylindrical metallic container 1 arranged horizontally and insulation gas is filled in the metallic container 1 in order to insulate the conductive parts 2, 3 from the metallic container 1, a dielectric 5 is applied at least on the inner face at the bottom part of the metallic container 1 within a range where the field strength between the conductive parts 2, 3 and the metallic container 1 is the highest.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は円筒状の金属容器の内
部に導電部を絶縁支持し、絶縁ガスを充たしたガス絶縁
電気機器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated electric device in which a conductive portion is insulated and supported in a cylindrical metal container and filled with an insulating gas.

【０００２】[0002]

【従来の技術】図４は例えば、特開平2-184213号公報に
開示された従来のガス絶縁電気機器を示す断面図であ
る。図についてその構成を説明すると、１は接地した円
筒状の金属容器、１ａは金属容器１の底部に設けたポケ
ット、２は金属容器１の内部に絶縁スペーサ（図示せ
ず）で同心状態に絶縁支持した丸い棒状の導体、３は導
体２に設けたシールドで導体２の突出部と金属容器１と
の間の電界の集中を緩和する。10は金属容器１の内部に
混入した微小な金属異物、11はポケット１ａに置いたパ
ーティクルトラップで金属異物10を捕捉する。2. Description of the Related Art FIG. 4 is a sectional view showing a conventional gas-insulated electric device disclosed in, for example, Japanese Patent Laid-Open No. 2-184213. The structure will be described with reference to the drawings. 1 is a grounded cylindrical metal container, 1a is a pocket provided at the bottom of the metal container 1, and 2 is an insulating spacer (not shown) inside the metal container 1 that is insulated in a concentric state. The supported round rod-shaped conductor 3 is a shield provided on the conductor 2 to reduce the concentration of the electric field between the protruding portion of the conductor 2 and the metal container 1. Reference numeral 10 is a minute metal foreign substance mixed in the metal container 1, and 11 is a particle trap placed in the pocket 1a to capture the metal foreign substance 10.

【０００３】従来のガス絶縁電気機器は以上のように構
成され、接地した金属容器１の内部に導電部の導体２、
シールド３を同心状態にして絶縁スペーサ（図示せず）
で絶縁支持し、六弗化硫黄ガスなどの絶縁ガスを充たし
て導体２、シールド３と金属容器１との間の電気絶縁を
施す。この金属容器１の内部には金属の切粉、溶接のス
パック、開閉動作に伴う金属粉塵や金属化合物などの導
電性を有する微小な金属異物10の存在することがある。
導体２、シールド３に高電圧を印加し、金属容器１との
間の電界強度が一定値以上になると、金属容器１の底部
にある金属異物10は浮上し交番する電圧の瞬時値、極性
に応じて躍りながら移動する。金属異物10が金属容器１
と導体２、シールド３との間を躍りながら移動すると絶
縁性能に影響があるので、金属容器１のポケット１ａに
パーティクルトラップ11を置いて金属異物10を捕捉する
ようになっている。The conventional gas-insulated electric equipment is constructed as described above, and the conductor 2 of the conductive portion is provided inside the grounded metal container 1.
Insulating spacer (not shown) with shield 3 concentric
Is insulated and supported, and is filled with an insulating gas such as sulfur hexafluoride gas to provide electrical insulation between the conductor 2, the shield 3 and the metal container 1. Inside the metal container 1, there may be metal chips, welding spacks, and minute metal foreign substances 10 having conductivity such as metal dust and metal compounds that accompany opening / closing operations.
When a high voltage is applied to the conductor 2 and the shield 3 and the electric field strength between the metal container 1 and the metal container 1 becomes a certain value or more, the metallic foreign matter 10 at the bottom of the metal container 1 floats, and the instantaneous value and polarity of the alternating voltage are changed. Moves while jumping accordingly. Foreign metal 10 is metal container 1
Since jumping between the conductor 2, the conductor 2 and the shield 3 affects the insulating performance, the particle trap 11 is placed in the pocket 1a of the metal container 1 to capture the foreign metal 10.

【０００４】[0004]

【発明が解決しようとする課題】従来のガス絶縁電気機
器は以上のように構成され、金属容器１にポケット10を
設けてその中にパーティクルトラップ11を置き、金属容
器１と導体２、シールド３との間を躍りながら移動する
金属異物10を捕捉するようになっているが、構造が複雑
になると云う技術上の課題があった。The conventional gas-insulated electric equipment is constructed as described above, and the metal container 1 is provided with the pocket 10 and the particle trap 11 is placed therein, and the metal container 1, the conductor 2 and the shield 3 are provided. Although the foreign metal 10 that moves while jumping between and is caught, there is a technical problem that the structure becomes complicated.

【０００５】この発明は上記のような課題を解決するた
めになされたもので、金属容器と導電部の導体、シール
ドとの間を金属異物が躍りながら移動するのを抑制し、
構造が簡単で絶縁性能のすぐれたガス絶縁電気機器を提
供することを目的とする。The present invention has been made in order to solve the above-mentioned problems, and suppresses the metallic foreign matter from jumping and moving between the metal container and the conductor and shield of the conductive portion,
An object of the present invention is to provide a gas-insulated electric device having a simple structure and excellent insulation performance.

【０００６】[0006]

【課題を解決するための手段】この発明に係るガス絶縁
電気機器は水平に配置した円筒状の金属容器の内部に長
伸の導電部を同じ長さ方向にして収め、絶縁支持して絶
縁ガスを充たし、導電部を金属容器から絶縁したガス絶
縁電気機器において、金属容器の少なくとも底部内面で
導電部と金属容器との間の電界強度が最大になる範囲に
誘電体を被着したものである。A gas-insulated electric apparatus according to the present invention has a horizontally elongated cylindrical metal container in which a long conductive portion is housed in the same length direction, and is insulated and supported to provide an insulating gas. In a gas-insulated electric device in which the conductive part is insulated from the metal container, a dielectric is applied to a range where the electric field strength between the conductive part and the metal container is maximized at least on the inner surface of the bottom of the metal container. ..

【０００７】また、誘電体の表面を波状に形成する。Further, the surface of the dielectric is formed in a wave shape.

【０００８】[0008]

【作用】この発明においては、導電部と金属容器との間
の電界強度が一定値以上になると、金属容器の底部にあ
る金属異物は浮上し、躍りながら移動して誘電体の上に
落下するが、誘電体は金属異物を再び浮上しにくくす
る。According to the present invention, when the electric field strength between the conductive portion and the metal container becomes a certain value or more, the foreign metal particles at the bottom of the metal container levitate, jump and move and fall on the dielectric. However, the dielectric makes it difficult for the metallic foreign matter to re-float.

【０００９】[0009]

【実施例】実施例１．図１はこの発明の一実施例を示す
断面図、図２は金属異物の浮上する電界比（誘電体なし
の状態を１とする）と誘電体との関係を示す特性曲線図
である。図１において、１〜３は従来のガス絶縁電気機
器におけるものに同じかまたは相当する。５は金属容器
１の内面全周または内面下半周で電界強度が最大になる
範囲にコーティングした誘電体である。EXAMPLES Example 1. FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a characteristic curve diagram showing the relationship between the floating electric field ratio of metallic foreign matters (the state without a dielectric is 1) and the dielectric. In FIG. 1, 1 to 3 are the same as or correspond to those in the conventional gas-insulated electric equipment. Reference numeral 5 is a dielectric material coated on the entire inner surface of the metal container 1 or on the lower half surface of the inner surface in a range where the electric field strength is maximized.

【００１０】この実施例では導電部の導体２、シールド
３に高電圧を印加すると、シールド３の両端部と金属容
器１との間の電気力線の囲う空間で電界強度が最大にな
るので、金属容器１の内面全周または内面半周でこの範
囲に誘電体５をコーティングする。金属容器１の底部に
ある金属異物10は導体２、シールド３と金属容器１との
間の電界強度が一定値以上になると浮上して躍りながら
移動し、その多くは電界強度の最大になる空間に集まる
が、金属容器１にコーティングした誘電体５の上に落下
すると、再び浮上しにくくなる。金属容器１とその底部
にある金属異物10は導体２、シールド３と逆極性の電荷
が誘導されて同じ極性に帯電するので、金属異物10は金
属容器１から反発力を受けるほか、電界により吸引を受
けて浮上する。ところが、金属容器１の内面にコーティ
ングした誘電体５の上に金属異物10があると、誘電体５
は分極し、誘電体５の表面と金属異物10とはともにシー
ルド３と逆極性に帯電するが、電荷が少ないので、誘電
体５から受ける反発力は小さくなり、浮上しにくくなる
ものと考えられる。このことを実験により確認した。図
２はその実験結果であり、金属容器１の内面に誘電体５
をコーティングすると、誘電体５のない状態より金属異
物10の浮上する電界強度が大きくなることを示してい
る。図２の誘電体＃１と誘電体＃２は誘電率が異なる。In this embodiment, when a high voltage is applied to the conductor 2 and the shield 3 of the conductive portion, the electric field strength becomes maximum in the space surrounded by the lines of electric force between the both ends of the shield 3 and the metal container 1. The dielectric 5 is coated on the entire inner surface or the inner surface of the metal container 1 in this range. When the electric field strength between the conductor 2, the shield 3 and the metal container 1 exceeds a certain value, the metallic foreign matter 10 at the bottom of the metal container 1 floats and jumps, and most of them are spaces where the electric field strength is maximum. However, when it falls on the dielectric 5 coated on the metal container 1, it becomes difficult to float again. Since the metal container 1 and the metal foreign substance 10 at the bottom thereof are charged with the same polarity as the conductors 2 and the shield 3 are induced, the metal foreign substance 10 receives repulsive force from the metal container 1 and is attracted by an electric field. Receive and surface. However, if the foreign metal 10 is present on the dielectric 5 coated on the inner surface of the metal container 1, the dielectric 5
Is polarized, and both the surface of the dielectric 5 and the foreign metal 10 are charged with the opposite polarity to the shield 3, but since the charge is small, the repulsive force received from the dielectric 5 is small, and it is thought that it is difficult to float. . This was confirmed by experiments. FIG. 2 shows the result of the experiment, in which the dielectric 5 is formed on the inner surface of the metal container 1.
Shows that the electric field strength for floating the metallic foreign matter 10 is higher than that in the state without the dielectric 5. Dielectric # 1 and dielectric # 2 in FIG. 2 have different dielectric constants.

【００１１】実施例２．図３はこの発明の他の実施例を
示す断面図であり、金属容器１の内面全周または内面下
半周で電界強度が最大になる範囲に表面を波状にした誘
電体６をコーティングしたものである。この実施例によ
れば、金属容器１の底部にある金属異物10は導電部の導
体２、シールド３に高電圧を印加すると浮上して躍りな
がら移動し、その多くは電界強度の最大になる空間に集
まって誘電体６の上に落下し、波状の凹部に落ち込み易
い。だが、分極した誘電体６は波状の凸部に電荷が多
く、凹部には少ないので、金属異物10が誘電体６から受
ける反発力は小さくなり、一層浮上しにくくなる。Embodiment 2. FIG. 3 is a cross-sectional view showing another embodiment of the present invention, in which the surface of the metal container 1 is coated with the corrugated dielectric 6 in the range where the electric field strength is maximized on the entire inner surface or the lower half of the inner surface. is there. According to this embodiment, the metallic foreign matter 10 at the bottom of the metal container 1 floats and jumps when a high voltage is applied to the conductor 2 and the shield 3 of the conductive portion, and most of them move in a space where the electric field strength is maximum. It is easy for the particles to gather on the dielectric 6 and fall onto the dielectric 6 and fall into the wavy concave portion. However, since the polarized dielectric 6 has a large amount of electric charges in the wavy convex portion and a small amount in the concave portion, the repulsive force that the foreign metal 10 receives from the dielectric 6 is small, and it becomes more difficult to float.

【００１２】[0012]

【発明の効果】以上説明したとおり、この発明によれ
ば、金属容器の少なくとも底部内面で導電部と金属容器
との間の電界強度が最大になる範囲に誘電体を被着した
ので、誘電体の上に落下した金属異物は再び浮上しにく
くなり、導電部と金属容器との間を金属異物が躍りなが
ら移動するのが抑制され、構造が簡単で、絶縁性能のす
ぐれたものが得られる効果がある。As described above, according to the present invention, the dielectric is deposited on the inner surface of at least the bottom of the metal container in the range where the electric field strength between the conductive portion and the metal container is maximized. It is difficult for the metallic foreign matter that has fallen onto the surface to re-float again, and the metallic foreign matter is prevented from jumping and moving between the conductive part and the metal container, and the structure is simple and excellent insulation performance is obtained. There is.

【図面の簡単な説明】[Brief description of drawings]

【図１】この発明の一実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.

【図２】金属異物の浮上する電界比と誘電体との関係を
示す特性曲線図である。FIG. 2 is a characteristic curve diagram showing a relationship between a floating electric field ratio of a metallic foreign matter and a dielectric.

【図３】この発明の他の実施例を示す断面図である。FIG. 3 is a sectional view showing another embodiment of the present invention.

【図４】従来のガス絶縁電気機器を示す断面図である。FIG. 4 is a cross-sectional view showing a conventional gas-insulated electric device.

【符号の説明】[Explanation of symbols]

１ 金属容器 ２ 導体 ３ シールド ５ 誘電体 ６ 誘電体 1 Metal container 2 Conductor 3 Shield 5 Dielectric 6 Dielectric

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 水平に配置した円筒状の金属容器の内部
に長伸の導電部を同じ長さ方向にして収め絶縁支持し
て、絶縁ガスを充たし、上記導電部を上記金属容器から
絶縁したガス絶縁電気機器において、上記金属容器の少
なくとも底部内面で上記導電部と上記金属容器との間の
電界強度が最大になる範囲に誘電体を被着したことを特
徴とするガス絶縁電気機器。1. A horizontally-arranged cylindrical metal container is accommodated with an elongated conductive part in the same length direction and insulated and supported, and is filled with an insulating gas to insulate the conductive part from the metal container. In the gas-insulated electric device, a dielectric is deposited on a region where the electric field strength between the conductive portion and the metal container is maximized at least on the inner surface of the bottom of the metal container. 【請求項２】 誘電体の表面を波状に形成したことを特
徴とする請求項１記載のガス絶縁電気機器。2. The gas-insulated electric device according to claim 1, wherein the surface of the dielectric is formed in a wavy shape.