JPH06165360A - Insulator block - Google Patents
Insulator blockInfo
- Publication number
- JPH06165360A JPH06165360A JP30890492A JP30890492A JPH06165360A JP H06165360 A JPH06165360 A JP H06165360A JP 30890492 A JP30890492 A JP 30890492A JP 30890492 A JP30890492 A JP 30890492A JP H06165360 A JPH06165360 A JP H06165360A
- Authority
- JP
- Japan
- Prior art keywords
- insulating
- laminated
- divided
- insulating block
- constituted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000012212 insulator Substances 0.000 title 1
- 238000010030 laminating Methods 0.000 claims abstract description 4
- 238000009413 insulation Methods 0.000 claims description 5
- 230000005684 electric field Effects 0.000 abstract description 9
- 230000015556 catabolic process Effects 0.000 abstract description 5
- 238000004804 winding Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 3
- 239000004020 conductor Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高電圧ケーブルの絶縁
補強に使用されるストレスコーン等の絶縁ブロックに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating block such as a stress cone used for reinforcing insulation of a high voltage cable.
【０００２】[0002]
【従来の技術】高電圧ケーブルの接続部や終端部におい
ては、電界集中等による絶縁破壊を防止するために、ス
トレスコーン等の絶縁ブロックが使用される。図２は一
般のケーブル終端縦断面図である。図において、ケーブ
ル１はシース２と遮蔽層３、絶縁層４を順に段剥し導体
５を露出させている。この絶縁層４の外側にストレスコ
ーン６が嵌め込まれている。ストレスコーン６は、半導
電部７と絶縁部８を備えている。この半導電部７は、ケ
ーブル１の遮蔽層３と電気接続され、遮蔽層３の終端近
傍の電界を緩和する。2. Description of the Related Art An insulating block such as a stress cone is used at a connecting portion or a terminating portion of a high voltage cable in order to prevent dielectric breakdown due to electric field concentration. FIG. 2 is a vertical sectional view of a general cable termination. In the figure, a cable 1 has a sheath 2, a shield layer 3, and an insulating layer 4 stepped off in order to expose a conductor 5. A stress cone 6 is fitted on the outside of the insulating layer 4. The stress cone 6 includes a semiconductive portion 7 and an insulating portion 8. The semiconductive portion 7 is electrically connected to the shield layer 3 of the cable 1 and relaxes the electric field near the terminal end of the shield layer 3.
【０００３】このようなストレスコーン６は次のように
して製造される。図３に、従来のストレスコーン６の主
要部縦断面図を示す。図に示すように、絶縁部８は全体
として積層構造となっている。即ち、ＥＰゴムテープを
ケーブル状の巻芯に巻き付けて、図に示すような断面形
状に成型する。その後、これを加硫成型することによっ
て一体化する。半導電部７についてもほぼ同様の方法に
よって製造される。Such a stress cone 6 is manufactured as follows. FIG. 3 shows a vertical cross-sectional view of the main part of the conventional stress cone 6. As shown in the figure, the insulating portion 8 has a laminated structure as a whole. That is, the EP rubber tape is wound around a cable-shaped winding core and molded into a cross-sectional shape as shown in the figure. Then, this is integrated by vulcanization molding. The semiconductive portion 7 is also manufactured by substantially the same method.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上記のよう
な従来の絶縁ブロックには次のような解決すべき課題が
あった。図３に示すように絶縁部８を積層構造とした場
合に、製品検査の段階で層の界面に沿って絶縁破壊が生
じるものがあった。ストレスコーンには、実際にケーブ
ルに装着して高電圧を加えた場合に、図３に示す矢印９
に示すような方向に電界が加わる。従って、絶縁部８を
このような積層構造にした場合、この層の界面に沿って
比較的高い電圧が加わる。ここで、もしゴムテープの巻
き付け層間に微少な空隙等が存在する場合、沿層方向の
絶縁耐力が不十分となる。その結果層間のブレークダウ
ンが生じ、製品の歩止りが低下するという問題があっ
た。本発明は以上の点に着目してなされたもので、この
ような原因による絶縁耐力を向上させた絶縁ブロックを
提供することを目的とするものである。The conventional insulating block as described above has the following problems to be solved. When the insulating portion 8 has a laminated structure as shown in FIG. 3, there are some cases where dielectric breakdown occurs along the interface of the layers at the product inspection stage. When the stress cone is actually attached to the cable and a high voltage is applied, the arrow 9 shown in FIG.
An electric field is applied in the direction as shown in. Therefore, when the insulating portion 8 has such a laminated structure, a relatively high voltage is applied along the interface of this layer. Here, if a minute gap or the like exists between the winding layers of the rubber tape, the dielectric strength in the layer-wise direction becomes insufficient. As a result, there is a problem that breakdown occurs between the layers and the yield of the product is reduced. The present invention has been made in view of the above points, and an object thereof is to provide an insulating block having an improved dielectric strength due to such a cause.
【０００５】[0005]
【課題を解決するための手段】本発明の絶縁ブロック
は、絶縁シートを積層して構成した絶縁ブロックを、２
以上の分割片に区分して、前記各区分ごとに、前記絶縁
シートの積層面の方向を異ならせたことを特徴とするも
のである。The insulating block of the present invention comprises an insulating block formed by laminating insulating sheets.
It is characterized in that it is divided into the above divided pieces, and the direction of the laminated surface of the insulating sheet is different for each of the divided pieces.
【０００６】[0006]
【作用】この絶縁ブロックでは、例えば半導電部の前方
にある絶縁部を、先端部と中間部の２つの分割片に区分
する。そして、先端部は、界面が放射方向に向くよう絶
縁シートを積層する。また、中間部はケーブル長手方向
にその界面が並行になるように絶縁テープを巻回する。
これによって、積層された絶縁シートや絶縁テープの層
間に微少な欠陥が存在しても、積層界面が電界と同方向
に連続しないので、絶縁ブロック全体に渡って直ちに絶
縁破壊が生じるという問題を除去できる。In this insulating block, for example, the insulating portion in front of the semiconductive portion is divided into two pieces, the tip portion and the intermediate portion. The tip portion is laminated with insulating sheets so that the interface faces in the radial direction. The insulating tape is wound around the intermediate portion so that the interface is parallel to the longitudinal direction of the cable.
This eliminates the problem of immediate dielectric breakdown across the entire insulating block because the laminated interface does not continue in the same direction as the electric field even if there are minute defects between the laminated insulating sheets or insulating tapes. it can.
【０００７】[0007]
【実施例】以下、本発明を図の実施例を用いて詳細に説
明する。図１は本発明の絶縁ブロック実施例を示す主要
部縦断面図である。図に示すように、この実施例はケー
ブルの接続部や終端部に装着されるストレスコーンのよ
うな絶縁ブロック１１に対し本発明を採用したものであ
る。この絶縁ブロック１１は、先に図２や図３で説明し
たように、半導電部１２及び絶縁部１３から構成され
る。半導電部１２と絶縁部１３の断面形状自体は従来の
ものと変わるところはない。The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of an insulating block of the present invention. As shown in the figure, this embodiment adopts the present invention to an insulating block 11 such as a stress cone attached to a connecting portion or a terminal portion of a cable. The insulating block 11 is composed of the semiconductive portion 12 and the insulating portion 13 as described above with reference to FIGS. 2 and 3. The cross-sectional shapes of the semiconductive portion 12 and the insulating portion 13 are the same as those of the conventional one.
【０００８】ここで、本発明のストレスコーン１１の絶
縁部１３は、図に示すように全体として先端部１３−１
と中間部１３−２とに分割されている。そして、先端部
１３−１は図に示すような環状に打抜きをしたゴムシー
ト（絶縁シート）１４を順番に重ね併せて構成されてい
る。また、中間部１３−２は、図に示すようなＥＰゴム
テープ１５を巻き付けるようにして成型されている。こ
れらは図のような断面形状に積層された後、従来同様加
硫成型される。Here, as shown in the figure, the insulating portion 13 of the stress cone 11 of the present invention as a whole has a tip portion 13-1.
And an intermediate portion 13-2. The tip portion 13-1 is formed by sequentially stacking annularly punched rubber sheets (insulating sheets) 14 as shown in the figure. The intermediate portion 13-2 is formed by winding the EP rubber tape 15 as shown in the figure. These are laminated in a cross-sectional shape as shown in the figure and then vulcanized and molded as in the conventional case.
【０００９】本発明においては、特にこのように２以上
の分割片に区分した絶縁ブロック１３の各区分における
絶縁シートの積層面の方向が互いに異なるようにしてい
る。理想的には、欠陥のないゴムの塊を図のような断面
形状に仕上げることが好ましい。しかしながら、この種
の絶縁ブロックは、高電圧ケーブルの場合非常に大型化
し、一挙に欠陥のないゴムの塊を成型することは不可能
である。従って、上記のような積層構造を取らざるを得
ない。この場合に、本発明のように絶縁ブロックを２以
上の分割片に区分して、各区分で互いでその積層面の方
向を異ならせるようにすれば、各区分ごとの電界に対し
最も弱い方向を異ならせることができる。従って、従来
のように絶縁ブロック１３の全体に渡って同一方向に積
層面が存在するものに比べ、沿層方向の絶縁耐力が向上
する。In the present invention, the directions of the laminated surfaces of the insulating sheets in the respective sections of the insulating block 13 divided into two or more divided pieces are made different from each other. Ideally, it is preferable to finish a defect-free rubber block into a cross-sectional shape as shown in the figure. However, this type of insulating block becomes very large in the case of a high-voltage cable, and it is impossible to form a rubber block without defects at once. Therefore, there is no choice but to adopt the above-mentioned laminated structure. In this case, if the insulating block is divided into two or more divided pieces as in the present invention and the direction of the laminated surface is different in each section, the direction weakest against the electric field in each section. Can be different. Therefore, as compared with the conventional one in which the laminated surface exists in the same direction over the entire insulating block 13, the dielectric strength in the lateral direction is improved.
【００１０】本発明は以上の実施例に限定されない。上
記実施例では、絶縁ブロックをストレスコーンを例に取
って説明したが、ストレスコーン以外に、例えば分岐接
続部の使用されていない空き端子に装着される絶縁用の
盲栓等、この種の絶縁シートや絶縁ゴムを積層して成型
されるあらゆる製品に応用が可能である。また、その分
割数や分割方向は任意であり、実際にその絶縁ブロック
に加わる電界の方向を考慮し、その電界の方向にできる
だけ垂直になるような積層面や分割面とすることが好ま
しい。また、分割片の境界面は、その近傍に加わる電界
の方向と巻き付け作業性の両方を考慮し、最適の方向を
選択することが好ましい。The present invention is not limited to the above embodiments. In the above-mentioned embodiment, the insulating block has been described by taking the stress cone as an example, but in addition to the stress cone, this type of insulation such as a blind plug for insulation attached to an unused terminal of the branch connection part is not used. It can be applied to any product made by laminating sheets and insulating rubber. Further, the number of divisions and the direction of division are arbitrary, and it is preferable to consider the direction of the electric field actually applied to the insulating block and to make the laminated surface or the divided surface as vertical as possible to the direction of the electric field. Further, it is preferable that the boundary surface of the divided piece is selected in consideration of both the direction of the electric field applied in the vicinity thereof and the winding workability.
【００１１】[0011]
【発明の効果】以上説明した本発明の絶縁ブロックは、
絶縁シートを積層して構成した絶縁ブロックを、２以上
の分割片に区分して、各区分ごとに絶縁シートの積層面
の方向を異ならせたので、全体として絶縁ブロックの積
層面が各種の方向に向くため、沿層方向の絶縁耐力が向
上する。これにより、この種の絶縁ブロックをより高電
圧のケーブルに適用することが可能となる。The insulating block of the present invention described above is
Since the insulating block formed by stacking the insulating sheets is divided into two or more divided pieces, and the direction of the laminated surface of the insulating sheet is made different for each division, the laminated surface of the insulating block has various directions as a whole. Therefore, the dielectric strength in the creeping direction is improved. This makes it possible to apply this type of insulation block to higher voltage cables.
【図１】本発明の絶縁ブロック実施例を示す主要部縦断
面図である。FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of an insulating block of the present invention.
【図２】一般のケーブル終端の一例を示す縦断面図であ
る。FIG. 2 is a vertical sectional view showing an example of a general cable termination.
【図３】従来の絶縁ブロックの一例を示す主要部縦断面
図である。FIG. 3 is a longitudinal sectional view of a main part showing an example of a conventional insulating block.
１１ ストレスコーン（絶縁ブロック） １２ 半導電部 １３ 絶縁部 １３−１ 先端部 １３−２ 中間部 １４ 環状の絶縁シート １５ 絶縁テープ 11 Stress Cone (Insulating Block) 12 Semi-Conducting Part 13 Insulating Part 13-1 Tip Part 13-2 Intermediate Part 14 Annular Insulating Sheet 15 Insulating Tape
Claims (1)
ックを、２以上の分割片に区分して、 前記各区分ごとに、前記絶縁シートの積層面の方向を異
ならせたことを特徴とする絶縁ブロック。1. An insulating block formed by laminating insulating sheets is divided into two or more divided pieces, and a direction of a laminated surface of the insulating sheet is different for each of the divided pieces. Insulation block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30890492A JPH06165360A (en) | 1992-11-18 | 1992-11-18 | Insulator block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30890492A JPH06165360A (en) | 1992-11-18 | 1992-11-18 | Insulator block |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06165360A true JPH06165360A (en) | 1994-06-10 |
Family
ID=17986674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30890492A Pending JPH06165360A (en) | 1992-11-18 | 1992-11-18 | Insulator block |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06165360A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424418A (en) * | 2013-08-15 | 2013-12-04 | 国家电网公司 | Digital radiographic testing block for linear defects of basin-type insulators and production method |
-
1992
- 1992-11-18 JP JP30890492A patent/JPH06165360A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424418A (en) * | 2013-08-15 | 2013-12-04 | 国家电网公司 | Digital radiographic testing block for linear defects of basin-type insulators and production method |
| CN103424418B (en) * | 2013-08-15 | 2016-02-17 | 国家电网公司 | A kind of disc insulator line defect digital radial detects test block and method for making |
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