JPH04236114A - Unit and method for connecting power cable - Google Patents
Unit and method for connecting power cableInfo
- Publication number
- JPH04236114A JPH04236114A JP3012546A JP1254691A JPH04236114A JP H04236114 A JPH04236114 A JP H04236114A JP 3012546 A JP3012546 A JP 3012546A JP 1254691 A JP1254691 A JP 1254691A JP H04236114 A JPH04236114 A JP H04236114A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- insulating tube
- conductive layer
- cable
- insulating
- 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
- 238000000034 method Methods 0.000 title claims description 25
- 229920003020 cross-linked polyethylene Polymers 0.000 claims abstract description 39
- 239000004703 cross-linked polyethylene Substances 0.000 claims abstract description 39
- 239000004020 conductor Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 238000009413 insulation Methods 0.000 claims description 15
- 239000012212 insulator Substances 0.000 claims description 12
- 229920003023 plastic Polymers 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 230000001595 contractor effect Effects 0.000 abstract 1
- 239000004593 Epoxy Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 239000003822 epoxy resin Substances 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 238000003908 quality control method Methods 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009421 internal insulation Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- Processing Of Terminals (AREA)
- Cable Accessories (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、ゴム又はプラスチック
絶縁電力ケーブルの接続に用いる接続ユニットと、それ
を用いた電力ケーブルの接続方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection unit used for connecting rubber or plastic insulated power cables, and a method of connecting power cables using the same.
【０００２】0002
【従来の技術】従来、架橋ポリエチレン絶縁電力ケーブ
ルに代表されるゴム又はプラスチック絶縁電力ケーブル
の接続方法には、エポキシＰＪ（プレハブジョイント）
工法、ゴムＰＪ工法、ＭＪ（モールドジョイント）工法
の三種がある。[Prior Art] Conventionally, epoxy PJ (prefabricated joint) is used to connect rubber or plastic insulated power cables, such as cross-linked polyethylene insulated power cables.
There are three types: rubber PJ method, and MJ (mold joint) method.
【０００３】エポキシＰＪ工法は、導体接続後のケーブ
ルの外周に主絶縁体であるエポキシ絶縁ブロックを配置
し、エポキシ絶縁ブロックとケーブルの間にゴム絶縁弾
性体を介在させ、これをバネ力で圧縮してエポキシ絶縁
ブロックとケーブルに密接させるものである。[0003] In the epoxy PJ construction method, an epoxy insulation block, which is the main insulator, is placed around the outer circumference of the cable after conductors are connected, and a rubber insulating elastic body is interposed between the epoxy insulation block and the cable, and this is compressed by spring force. The epoxy insulating block and the cable are closely connected to each other.
【０００４】ゴムＰＪ工法は、主絶縁体であるゴム円筒
ブロックを導体接続を終えたケーブルの外周に直接装着
するものである。ＭＪ工法は、導体接続を終えたケーブ
ルの外周に架橋剤入りポリエチレンをモールド成形した
後、それを架橋するものである。[0004] The rubber PJ construction method is a method in which a rubber cylindrical block, which is the main insulator, is directly attached to the outer periphery of the cable after conductor connection. The MJ method involves molding polyethylene containing a crosslinking agent around the outer periphery of a cable that has been connected to conductors, and then crosslinking it.
【０００５】[0005]
【発明が解決しようとする課題】エポキシＰＪ工法は、
組立は容易であるが、接続ユニットが重いため作業性が
悪く、かつ接続部が大型化する欠点がある。これは、主
絶縁体であるエポキシ樹脂の許容電気ストレスが架橋ポ
リエチレン等に比べて小さいため絶縁厚が厚くなること
と、エポキシ樹脂に充填剤が入っているための比重が大
きいことによる。したがって超高圧電力ケーブルの接続
に使用すると、接続部の外径が大きくなりすぎ、かつ重
量が重すぎて、実用上問題がある。[Problems to be solved by the invention] The epoxy PJ method is
Although it is easy to assemble, the connection unit is heavy, making it difficult to work with, and the connection part becomes large. This is because the allowable electrical stress of the epoxy resin, which is the main insulator, is smaller than that of cross-linked polyethylene, resulting in a thicker insulation, and because the epoxy resin contains a filler, which has a higher specific gravity. Therefore, when used to connect an ultra-high voltage power cable, the outer diameter of the connecting portion becomes too large and the weight is too heavy, which poses a practical problem.
【０００６】ゴムＰＪ工法は、組立が容易で接続部を小
型にできるが、絶縁特性が不十分である。絶縁特性を向
上させるためにはゴム円筒ブロックの大型化が必要であ
るが、大型のゴム円筒ブロックを製造することは製造設
備上の限界がある。ＭＪ工法は、工事現場において絶縁
体のモールド成形と架橋を行うため、現場作業時間が例
えば２６日／３相と長く、非能率的であり、また現場品
質管理をきわめて厳しくする必要から作業者の負担が大
きく、さらに作業者の訓練に多大な時間と費用を要する
欠点がある。[0006] The rubber PJ construction method is easy to assemble and allows the connection portion to be made small, but the insulation properties are insufficient. In order to improve the insulation properties, it is necessary to increase the size of the rubber cylindrical block, but there are limits to manufacturing equipment for manufacturing large rubber cylindrical blocks. The MJ construction method requires insulator molding and cross-linking at the construction site, so the on-site work time is long, for example, 26 days/3 phases, which is inefficient, and the on-site quality control needs to be extremely strict, making it difficult for workers to work. This method has the disadvantage that it is a heavy burden and requires a great deal of time and expense to train the workers.
【０００７】本発明の目的は、上記のような課題を解決
した電力ケーブル接続ユニットと、それを用いた電力ケ
ーブル接続方法を提供することにある。An object of the present invention is to provide a power cable connection unit that solves the above-mentioned problems, and a power cable connection method using the same.
【０００８】[0008]
【課題を解決するための手段】本発明の電力ケーブル接
続ユニットは、ゴムを主体とする内部絶縁筒と架橋ポリ
エチレンを主体とする外部絶縁筒との組合せにより構成
される。内部絶縁筒は、接続すべきゴム又はプラスチッ
ク絶縁電力ケーブルのケーブル絶縁体に跨がって被せら
れるゴム絶縁筒と、そのゴム絶縁筒の両端に一体に形成
され、ケーブル外部導電層上に位置するゴム外部導電層
と、ゴム絶縁筒の中央部に内面を露出させて一体に形成
されたゴム内部導電層とからなる。[Means for Solving the Problems] The power cable connection unit of the present invention is constituted by a combination of an inner insulating tube mainly made of rubber and an outer insulating tube mainly made of cross-linked polyethylene. The inner insulating tube is formed integrally with a rubber insulating tube that is placed over the cable insulator of the rubber or plastic insulated power cable to be connected, and is integrally formed at both ends of the rubber insulating tube, and is located on the outer conductive layer of the cable. It consists of a rubber outer conductive layer and a rubber inner conductive layer integrally formed in the center of the rubber insulating cylinder with the inner surface exposed.
【０００９】また外部絶縁筒は、内部絶縁筒のゴム絶縁
筒上に位置する架橋ポリエチレン絶縁筒と、その架橋ポ
リエチレン絶縁筒の両端および外周面に一体に形成され
、両端部が内部絶縁筒のゴム外部導電層上に位置する架
橋ポリエチレン外部導電層とからなる。The outer insulating tube is formed integrally with the crosslinked polyethylene insulating tube located on the rubber insulating tube of the inner insulating tube, and the both ends and outer circumferential surface of the crosslinked polyethylene insulating tube, with both ends of the crosslinked polyethylene insulating tube positioned on the rubber insulating tube of the inner insulating tube. a crosslinked polyethylene outer conductive layer located on the outer conductive layer.
【００１０】この接続ユニットを用いて電力ケーブルを
接続するには、次の二つの方法のいずれかを採用すると
よい。一つの方法は、内部絶縁筒と外部絶縁筒を一体化
した接続ユニットを用い、この接続ユニットを加熱拡径
して熱収縮性を付与した後、いずれか一方の電力ケーブ
ル上に挿通し、その後、電力ケーブルの導体を接続した
後、接続ユニットを所定の接続位置に引き戻して加熱収
縮させるという方法である（請求項２）。[0010] In order to connect a power cable using this connection unit, it is preferable to adopt one of the following two methods. One method is to use a connection unit that integrates an internal insulating tube and an external insulating tube, expands the diameter of this connection unit by heating it to give it heat-shrinkability, and then inserts it onto one of the power cables. , after connecting the conductors of the power cable, the connection unit is pulled back to a predetermined connection position and heat-shrinked (claim 2).
【００１１】もう一つの方法は、内部絶縁筒をいずれか
一方の電力ケーブル上に挿通し、かつ、外部絶縁筒を加
熱拡径して熱収縮性を付与した状態で、いずれか一方の
電力ケーブル上に挿通し、その後、電力ケーブルの導体
を接続し、次いで内部絶縁筒を所定の接続位置に引き戻
し、さらに外部絶縁筒を内部絶縁筒上に引き戻して加熱
収縮させるという方法である（請求項３）Another method is to insert the inner insulating tube over one of the power cables, and heat the outer insulating tube to expand its diameter to give it heat-shrinkability. After that, the conductor of the power cable is connected, the inner insulating tube is pulled back to a predetermined connection position, and the outer insulating tube is pulled back onto the inner insulating tube and heat-shrinked (Claim 3). )
【００１２】0012
【作用】架橋ポリエチレンを使用した外部絶縁筒は、加
熱して拡径すると、熱収縮性を付与することができる。
本発明の接続ユニットは外部絶縁筒の熱収縮によりゴム
製の内部絶縁筒をケーブル外周面に押し付け、内部絶縁
筒のゴム弾性により界面の密着性を確保して、所要の絶
縁性能を得るものである。[Function] When the external insulating tube made of cross-linked polyethylene is heated to expand its diameter, it can be given heat-shrinkability. The connection unit of the present invention presses the rubber inner insulating tube against the outer peripheral surface of the cable by heat contraction of the outer insulating tube, and the rubber elasticity of the inner insulating tube secures the adhesion of the interface to obtain the required insulation performance. be.
【００１３】架橋ポリエチレンはケーブル絶縁材料とし
て実績があり、エポキシ樹脂（充填剤入り）に比べ、許
容電気ストレスがきわめて高く、比重が約半分程度であ
る。一方、ゴムは許容電気ストレスの点ではエポキシ樹
脂と同程度であるが、比重がエポキシ樹脂より格段に小
さい。したがって架橋ポリエチレンとゴムの２層構造で
接続ユニットを構成すると、エポキシＰＪ比べ、大幅な
外径縮小と重量軽減が可能となる。[0013] Cross-linked polyethylene has a proven track record as a cable insulating material, and has an extremely high allowable electrical stress and a specific gravity about half that of epoxy resin (filled with filler). On the other hand, although rubber has the same level of allowable electrical stress as epoxy resin, its specific gravity is much lower than that of epoxy resin. Therefore, when the connection unit is constructed with a two-layer structure of crosslinked polyethylene and rubber, it is possible to significantly reduce the outer diameter and weight compared to epoxy PJ.
【００１４】また内部絶縁筒および外部絶縁筒は工場生
産品であるため、品質管理および絶縁性能の確認が容易
である。さらに本発明の接続ユニットは部品点数が少な
いため現場組立が容易であり、またゴム部分の体積が小
さいため大型ゴム製造設備を必要としない。Furthermore, since the internal insulating cylinder and the external insulating cylinder are factory-produced products, quality control and confirmation of insulation performance are easy. Furthermore, since the connection unit of the present invention has a small number of parts, it is easy to assemble on-site, and since the volume of the rubber portion is small, large-scale rubber manufacturing equipment is not required.
【００１５】[0015]
【実施例】以下、本発明の実施例を図面を参照して詳細
に説明する。図１は本発明の一実施例を示す。この電力
ケーブル接続ユニット１１は、ゴムを主体とする内部絶
縁筒１２と、架橋ポリエチレンを主体とする外部絶縁筒
１３との組合せにより構成されている。Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the invention. This power cable connection unit 11 is composed of a combination of an internal insulating tube 12 mainly made of rubber and an external insulating tube 13 mainly made of crosslinked polyethylene.
【００１６】内部絶縁筒１２は、接続すべきゴム又はプ
ラスチック絶縁電力ケーブルのケーブル絶縁体に跨がっ
て被せられるゴム絶縁筒１４と、そのゴム絶縁筒１４の
両端に一体に形成され、ケーブル外部導電層上に位置す
るゴム外部導電層１５と、ゴム絶縁筒１４の中央部に内
面を露出させて一体に形成されたゴム内部導電層１６と
からなっている。The internal insulating tube 12 is formed integrally with a rubber insulating tube 14 that is placed over the cable insulator of the rubber or plastic insulated power cable to be connected, and is integrally formed at both ends of the rubber insulating tube 14, and is integrally formed with the rubber insulating tube 14 to cover the cable insulator of the rubber or plastic insulated power cable to be connected. It consists of a rubber outer conductive layer 15 located on the conductive layer, and a rubber inner conductive layer 16 integrally formed in the center of the rubber insulating cylinder 14 with its inner surface exposed.
【００１７】また外部絶縁筒１３は、内部絶縁筒１２の
ゴム絶縁筒１４上に位置する架橋ポリエチレン絶縁筒１
７と、その架橋ポリエチレン絶縁筒１７の両端および外
周面に一体に形成され、両端部が内部絶縁筒１２のゴム
外部導電層１５上に位置する架橋ポリエチレン外部導電
層１８とからなっている。The outer insulating tube 13 is made of cross-linked polyethylene insulating tube 1 located on the rubber insulating tube 14 of the inner insulating tube 12.
7, and a crosslinked polyethylene outer conductive layer 18 that is formed integrally with both ends and the outer peripheral surface of the crosslinked polyethylene insulating cylinder 17, and whose both ends are located on the rubber outer conductive layer 15 of the inner insulating cylinder 12.
【００１８】この例では、内部絶縁筒１２と外部絶縁筒
１３との界面は接着されており、両絶縁筒１２、１３は
一体となっている。図１では、内部絶縁筒１２と外部絶
縁筒１３の厚さがほぼ同じに示されているが、実際には
外部絶縁筒１３の厚さを内部絶縁筒１２より厚くした方
が、外径縮小および重量軽減の効果が大きい。なお、内
部絶縁筒１２はゴム弾性によりケーブルを締めつけるサ
イズに形成され、外部絶縁筒１３は熱収縮させたときに
内部絶縁筒１３を締めつけるサイズに形成される。In this example, the interface between the inner insulating cylinder 12 and the outer insulating cylinder 13 is bonded, and the two insulating cylinders 12 and 13 are integrated. In FIG. 1, the thickness of the inner insulating tube 12 and the outer insulating tube 13 are shown to be approximately the same, but in reality, it is better to make the outer insulating tube 13 thicker than the inner insulating tube 12 to reduce the outer diameter. and has a large weight reduction effect. The inner insulating tube 12 is formed to a size that tightens the cable due to its rubber elasticity, and the outer insulating tube 13 is formed to a size that tightens the inner insulating tube 13 when it is thermally shrunk.
【００１９】次に、この接続ユニットを用いた電力ケー
ブルの接続方法を説明する。まず図２に示すように、接
続ユニット１１を加熱して拡径する。外部絶縁筒１３は
架橋ポリエチレンよりなるため加熱拡径すると熱収縮性
が付与される。内部絶縁筒１２は外部絶縁筒１３と接着
しているため、拡径後は周方向に引き伸ばされた状態と
なる。この加熱拡径作業は工事現場で行ってもよいし、
予め工場で行ってもよい。Next, a method for connecting power cables using this connection unit will be explained. First, as shown in FIG. 2, the connection unit 11 is heated to expand its diameter. Since the external insulating cylinder 13 is made of cross-linked polyethylene, it is given heat-shrinkability when heated and expanded. Since the internal insulating cylinder 12 is bonded to the external insulating cylinder 13, the internal insulating cylinder 12 is stretched in the circumferential direction after the diameter is expanded. This heating and diameter expansion work can be done at the construction site, or
It may be done in advance at the factory.
【００２０】次に拡径後の接続ユニット１１を図３に示
すように接続すべき架橋ポリエチレン絶縁電力ケーブル
２１Ａ、２１Ｂのいずれか一方の外周に挿通する。その
後、電力ケーブル２１Ａ、２１Ｂの導体２２Ａ、２２Ｂ
を図４に示すように導体接続管２３により圧縮接続し、
さらにその外周に接続管カバー２４を被せる。次いで接
続ユニット１１を所定の接続位置に引き戻して加熱収縮
させる。すると図５のような接続構造が得られる。外部
絶縁筒１３の熱収縮により内部絶縁筒１２は圧迫され、
ゴム絶縁筒１４はケーブル絶縁体２５Ａ、２５Ｂ上に、
ゴム外部導電層１５はケーブル外部導電層２６Ａ、２６
Ｂ上に、ゴム内部導電層１６は接続管カバー２４上に、
それぞれ密接する。Next, as shown in FIG. 3, the connection unit 11 after the diameter expansion is inserted into the outer periphery of one of the crosslinked polyethylene insulated power cables 21A and 21B to be connected. After that, the conductors 22A, 22B of the power cables 21A, 21B
are compressed and connected by a conductor connecting pipe 23 as shown in FIG.
Furthermore, a connecting pipe cover 24 is placed over the outer periphery of the connecting pipe cover 24. Next, the connection unit 11 is pulled back to a predetermined connection position and heat-shrinked. Then, a connection structure as shown in FIG. 5 is obtained. The internal insulating cylinder 12 is compressed by the thermal contraction of the external insulating cylinder 13,
The rubber insulating tube 14 is placed on the cable insulators 25A and 25B,
The rubber outer conductive layer 15 is the cable outer conductive layer 26A, 26
On B, the rubber inner conductive layer 16 is on the connecting pipe cover 24,
Close to each other.
【００２１】この接続構造では、内部絶縁筒１２がゴム
弾性を有しているため、電力ケーブル２１Ａ、２１Ｂの
熱膨張・収縮を吸収できる。In this connection structure, since the internal insulating cylinder 12 has rubber elasticity, it can absorb thermal expansion and contraction of the power cables 21A and 21B.
【００２２】図６は本発明の他の実施例を示す。この接
続ユニット１１も内部絶縁筒１２と外部絶縁筒１３とか
ら構成される点では図１の実施例と同様であるが、内部
絶縁筒１２と外部絶縁筒１３は接着されておらず、別体
である。内部絶縁筒１２および外部絶縁筒１３の構造は
前記実施例と同じであるので、同一部分には同一符号を
付して説明を省略する。FIG. 6 shows another embodiment of the invention. This connection unit 11 is also similar to the embodiment shown in FIG. 1 in that it is composed of an inner insulating tube 12 and an outer insulating tube 13, but the inner insulating tube 12 and the outer insulating tube 13 are not glued together and are separate bodies. It is. Since the structures of the internal insulating cylinder 12 and the external insulating cylinder 13 are the same as those in the previous embodiment, the same parts are denoted by the same reference numerals and the explanation thereof will be omitted.
【００２３】次に、この接続ユニットを用いた電力ケー
ブルの接続方法を説明する。まず外部絶縁筒１３を加熱
拡径して、熱収縮性を付与する。次に図７に示すように
内部絶縁筒１２と拡径後の外部絶縁筒１３を、接続すべ
き架橋ポリエチレン絶縁電力ケーブル２１Ａ、２１Ｂの
いずれか一方の外周に挿通する。Next, a method for connecting power cables using this connection unit will be explained. First, the external insulating cylinder 13 is heated and expanded in diameter to impart heat shrinkability. Next, as shown in FIG. 7, the inner insulating tube 12 and the outer insulating tube 13 after the diameter expansion are inserted into the outer periphery of one of the crosslinked polyethylene insulated power cables 21A and 21B to be connected.
【００２４】次に、電力ケーブル２１Ａ、２１Ｂの導体
２２Ａ、２２Ｂを図８に示すように導体接続管２３によ
り圧縮接続し、さらにその外周に接続管カバー２４を被
せた後、内部絶縁筒１２を所定の接続位置に引き戻す。
その後、外部絶縁筒１３を図９に示すように内部絶縁筒
１２上に引き戻して加熱収縮させる。すると前記実施例
と同様に図５のような接続構造が得られる。Next, as shown in FIG. 8, the conductors 22A and 22B of the power cables 21A and 21B are compressed and connected using the conductor connecting tube 23, and after covering the outer periphery of the connecting tube cover 24, the internal insulating tube 12 is closed. Pull it back into place. Thereafter, the outer insulating cylinder 13 is pulled back onto the inner insulating cylinder 12 as shown in FIG. 9 and is heated and shrunk. Then, a connection structure as shown in FIG. 5 is obtained as in the previous embodiment.
【００２５】次に上記構成の本発明の接続ユニットおよ
び接続方法と、従来のものとの優劣を各項目別に比較す
ると表１のとおりである。Next, Table 1 compares the advantages and disadvantages of the connection unit and connection method of the present invention having the above structure with the conventional ones in each item.
【００２６】[0026]
【表１】
なお、表１において、Ａは優れる、Ｂは普通、Ｃは劣る
、ＡＡは特に優れる、ＣＣは特に劣る、である。[Table 1] In Table 1, A is excellent, B is average, C is poor, AA is particularly excellent, and CC is particularly poor.
【００２７】以上の実施例では、内部絶縁筒のゴム内部
導電層を、ゴム絶縁筒の中央部内面側に埋め込む構造と
したが、図１０に示すようにゴム内部導電層１６をゴム
絶縁筒１４と同じ厚さに形成し、架橋ポリエチレン絶縁
筒１７の内面中央部に、ゴム内部導電層１６に接触する
架橋ポリエチレン内部導電層３１を形成する構造として
もよい。また内部導電層がゴム絶縁筒を貫通して、その
外周面側が架橋ポリエチレン絶縁筒に埋め込まれる構造
にすることもできる。このようにするとゴム絶縁筒１４
のラジアル方向の電気ストレスの負担がなくなり、電気
ストレスの厳しい部分を絶縁特性のよい架橋ポリエチレ
ン絶縁筒１７に負担させることができ、特性の安定化を
図れる。In the above embodiment, the rubber internal conductive layer of the internal insulating cylinder was embedded in the inner surface of the central part of the rubber insulating cylinder, but as shown in FIG. It is also possible to form a crosslinked polyethylene internal conductive layer 31 in contact with the rubber internal conductive layer 16 at the center of the inner surface of the crosslinked polyethylene insulating cylinder 17. It is also possible to adopt a structure in which the internal conductive layer passes through the rubber insulating tube and the outer peripheral surface thereof is embedded in the crosslinked polyethylene insulating tube. In this way, the rubber insulation tube 14
This eliminates the burden of electrical stress in the radial direction, allowing the cross-linked polyethylene insulating cylinder 17 with good insulation properties to bear the burden of severe electrical stress, thereby stabilizing the properties.
【００２８】また図１１に示すように内部導電層１２と
外部絶縁筒１３をテーパー面で接触させる構造にするこ
ともできる。このようにすると、ケーブルの熱膨張によ
る体積増加で発生する応力が、高温での機械的強度が高
くない架橋ポリエチレンにかかるのを軽減できる。Further, as shown in FIG. 11, it is also possible to have a structure in which the inner conductive layer 12 and the outer insulating cylinder 13 are brought into contact with each other at a tapered surface. In this way, it is possible to reduce the stress generated due to the increase in volume due to thermal expansion of the cable, which is applied to the crosslinked polyethylene, which does not have high mechanical strength at high temperatures.
【００２９】[0029]
【発明の効果】以上説明したように本発明の接続ユニッ
トは、比重の小さいゴムを主体とする内部絶縁筒と、比
重が小さく絶縁性能の高い架橋ポリエチレンを主体とす
る外部絶縁筒により構成されているので、従来のエポキ
シＰＪに比べ、大幅に重量を軽減でき、外径を小さくで
きる。またゴムＰＪに比べると、絶縁特性がよく、超高
圧用でも大型の製造設備を必要とせず、設備費が安価で
ある。さらにＭＪに比べると、現場における組立作業性
が優れ、現場品質管理が容易で、施工時間が格段に短い
という利点がある。したがって本発明の接続ユニットお
よび接続方法は、従来品の欠点が解消され、総合的にみ
て優れたものということができる。[Effects of the Invention] As explained above, the connection unit of the present invention is composed of an internal insulating cylinder mainly made of rubber with a low specific gravity and an external insulating cylinder mainly made of cross-linked polyethylene with a low specific gravity and high insulation performance. Therefore, compared to conventional epoxy PJ, the weight can be significantly reduced and the outer diameter can be made smaller. Furthermore, compared to rubber PJ, it has better insulation properties, does not require large manufacturing equipment even for ultra-high pressure applications, and is inexpensive in equipment cost. Furthermore, compared to MJ, it has the advantage of superior on-site assembly workability, easy on-site quality control, and significantly shorter construction time. Therefore, the connection unit and connection method of the present invention eliminate the drawbacks of conventional products and can be said to be superior overall.
【図面の簡単な説明】[Brief explanation of the drawing]
【図１】 本発明に係る接続ユニットの一実施例を示
す断面図。FIG. 1 is a sectional view showing an embodiment of a connection unit according to the present invention.
【図２】 図１の接続ユニットを拡径する状態を示す
説明図。FIG. 2 is an explanatory diagram showing a state in which the connection unit of FIG. 1 is expanded in diameter.
【図３】 図１の接続ユニットを用いた本発明の接続
方法の一過程を示す断面図。3 is a cross-sectional view showing one process of the connection method of the present invention using the connection unit of FIG. 1. FIG.
【図４】 同じくその後の過程を示す断面図。FIG. 4 is a cross-sectional view showing the subsequent process.
【図５】 図１の接続ユニットを用いた電力ケーブル
接続部の断面図。FIG. 5 is a cross-sectional view of a power cable connection using the connection unit of FIG. 1;
【図６】 本発明に係る接続ユニットの他の実施例を
示す断面図。FIG. 6 is a sectional view showing another embodiment of the connection unit according to the present invention.
【図７】 図６の接続ユニットを用いた本発明の接続
方法の一過程を示す断面図。7 is a cross-sectional view showing one process of the connection method of the present invention using the connection unit of FIG. 6. FIG.
【図８】 同じくその後の過程を示す断面図。FIG. 8 is a cross-sectional view showing the subsequent process.
【図９】 同じくその後の過程を示す断面図。FIG. 9 is a cross-sectional view showing the subsequent process.
【図１０】 本発明に係る接続ユニットのさらに他の
実施例を示す断面図。FIG. 10 is a sectional view showing still another embodiment of the connection unit according to the present invention.
【図１１】 同じくさらに他の実施例を示す断面図。FIG. 11 is a sectional view showing still another embodiment.
１１：接続ユニット １２：内部絶縁筒
１３：外部絶縁筒 １４：ゴム絶縁筒
１５：ゴム外部導電層 １６：ゴム内部導電層
１７：架橋ポリエチレン絶縁筒
１８：架橋ポリエチレン外部導電層 ２１Ａ、２
１Ｂ：架橋ポリエチレン電力ケーブル ２２Ａ、
２２Ｂ：ケーブル導体
２３：導体接続管 ２４：接続管カバー
２５Ａ、２５Ｂ：ケーブル絶縁体
２６Ａ、２６Ｂ：ケーブル外部導電層 ３１：架
橋ポリエチレン内部導電層11: Connection unit 12: Internal insulation tube
13: External insulating cylinder 14: Rubber insulating cylinder 15: Rubber external conductive layer 16: Rubber internal conductive layer
17: Cross-linked polyethylene insulation tube 18: Cross-linked polyethylene outer conductive layer 21A, 2
1B: Cross-linked polyethylene power cable 22A,
22B: Cable conductor 23: Conductor connecting tube 24: Connecting tube cover
25A, 25B: Cable insulator 26A, 26B: Cable outer conductive layer 31: Crosslinked polyethylene inner conductive layer
Claims (3)
ポリエチレンを主体とする外部絶縁筒との組合せからな
り、内部絶縁筒は、接続すべきゴム又はプラスチック絶
縁電力ケーブルのケーブル絶縁体に跨がって被せられる
ゴム絶縁筒と、そのゴム絶縁筒の両端に一体に形成され
、ケーブル外部導電層上に位置するゴム外部導電層と、
ゴム絶縁筒の中央部に内面を露出させて一体に形成され
たゴム内部導電層とからなり、外部絶縁筒は、内部絶縁
筒のゴム絶縁筒上に位置する架橋ポリエチレン絶縁筒と
、その架橋ポリエチレン絶縁筒の両端および外周面に一
体に形成され、両端部が内部絶縁筒のゴム外部導電層上
に位置する架橋ポリエチレン外部導電層とからなること
を特徴とする電力ケーブル接続ユニット。Claim 1: Consisting of a combination of an inner insulating tube mainly made of rubber and an outer insulating tube mainly made of cross-linked polyethylene, the inner insulating tube straddles the cable insulator of the rubber or plastic insulated power cable to be connected. a rubber insulating tube that is covered with the cable; a rubber outer conductive layer that is integrally formed on both ends of the rubber insulating tube and located on the cable outer conductive layer;
The outer insulation tube consists of a rubber inner conductive layer integrally formed with the inner surface exposed at the center of the rubber insulation tube. A power cable connection unit comprising a crosslinked polyethylene outer conductive layer formed integrally with both ends of an insulating cylinder and an outer circumferential surface of the inner insulating cylinder, the ends of which are located on the rubber outer conductive layer of the inner insulating cylinder.
電力ケーブルのケーブル絶縁体に跨がって被せられるゴ
ム絶縁筒と、そのゴム絶縁筒の両端に一体に形成され、
ケーブル外部導電層上に位置するゴム外部導電層と、ゴ
ム絶縁筒の中央部に内面を露出させて一体に形成された
ゴム内部導電層とからなる内部絶縁筒上に、内部絶縁筒
のゴム絶縁筒上に位置する架橋ポリエチレン絶縁筒と、
その架橋ポリエチレン絶縁筒の両端および外周面に一体
に形成され、両端部が内部絶縁筒のゴム外部導電層上に
位置する架橋ポリエチレン外部導電層とからなる外部絶
縁筒を一体に設けた接続ユニットを用い、この接続ユニ
ットを加熱拡径して熱収縮性を付与した後、いずれか一
方の電力ケーブル上に挿通し、その後、電力ケーブルの
導体を接続した後、接続ユニットを所定の接続位置に引
き戻して加熱収縮させることを特徴とする電力ケーブル
接続方法。2. A rubber insulating tube that is placed over the cable insulator of the rubber or plastic insulated power cable to be connected, and a rubber insulating tube that is integrally formed at both ends of the rubber insulating tube,
The rubber insulation of the inner insulating tube is placed on the inner insulating tube, which consists of a rubber outer conductive layer located on the cable outer conductive layer and a rubber inner conductive layer integrally formed with the inner surface exposed in the center of the rubber insulating tube. a cross-linked polyethylene insulating cylinder located on the cylinder;
A connection unit is provided with an external insulating tube integrally formed on both ends and the outer peripheral surface of the crosslinked polyethylene insulating tube, and with both ends of the crosslinked polyethylene external conductive layer located on the rubber external conductive layer of the internal insulating tube. After heating and enlarging the diameter of this connection unit to give it heat-shrinkability, it is inserted onto one of the power cables, and then, after connecting the conductor of the power cable, the connection unit is pulled back to the predetermined connection position. A power cable connection method characterized by heating and shrinking the power cable.
電力ケーブルのケーブル絶縁体に跨がって被せられるゴ
ム絶縁筒と、そのゴム絶縁筒の両端に一体に形成され、
ケーブル外部導電層上に位置するゴム外部導電層と、ゴ
ム絶縁筒の中央部に内面を露出させて一体に形成された
ゴム内部導電層部とからなる内部絶縁筒を、いずれか一
方の電力ケーブル上に挿通し、かつ、内部絶縁筒のゴム
絶縁筒上に位置する架橋ポリエチレン絶縁筒と、その架
橋ポリエチレン絶縁筒の両端および外周面に一体に形成
され、両端部が内部絶縁筒のゴム外部導電層上に位置す
る架橋ポリエチレン外部導電層とからなる外部絶縁筒を
、加熱拡径して熱収縮性を付与した状態で、いずれか一
方の電力ケーブル上に挿通し、その後、電力ケーブルの
導体を接続し、内部絶縁筒を所定の接続位置に引き戻し
た後、外部絶縁筒を内部絶縁筒上に引き戻して加熱収縮
させることを特徴とする電力ケーブル接続方法。3. A rubber insulating tube that is placed over the cable insulator of the rubber or plastic insulated power cable to be connected, and a rubber insulating tube that is integrally formed at both ends of the rubber insulating tube,
An inner insulating tube consisting of a rubber outer conductive layer located on the cable outer conductive layer and a rubber inner conductive layer integrally formed with the inner surface exposed in the center of the rubber insulating tube is connected to either one of the power cables. A cross-linked polyethylene insulating tube that is inserted above and located on the rubber insulating tube of the inner insulating tube, and a cross-linked polyethylene insulating tube that is integrally formed on both ends and the outer peripheral surface of the cross-linked polyethylene insulating tube, and that both ends are the rubber outer conductive tube of the inner insulating tube. An external insulating cylinder made of a cross-linked polyethylene external conductive layer located above the layer is heated to expand its diameter to give it heat-shrinkability, and then inserted over one of the power cables, and then the conductor of the power cable is inserted into the cylinder. A method for connecting a power cable, comprising: connecting the inner insulating tube to a predetermined connection position, and then pulling the outer insulating tube back onto the inner insulating tube and shrinking the outer insulating tube by heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3012546A JPH04236114A (en) | 1991-01-11 | 1991-01-11 | Unit and method for connecting power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3012546A JPH04236114A (en) | 1991-01-11 | 1991-01-11 | Unit and method for connecting power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04236114A true JPH04236114A (en) | 1992-08-25 |
Family
ID=11808332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3012546A Pending JPH04236114A (en) | 1991-01-11 | 1991-01-11 | Unit and method for connecting power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04236114A (en) |
-
1991
- 1991-01-11 JP JP3012546A patent/JPH04236114A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4019761A (en) | Connection for foam insulated pipes | |
| US4491687A (en) | Method of manufacturing a composite type stay insulator, and an insulator obtained by the method | |
| CN1055841A (en) | Be used to seal the radially contractibility sleeve pipe of cable joint or cable socket | |
| JPS6255247B2 (en) | ||
| JPH04236114A (en) | Unit and method for connecting power cable | |
| JPH09252523A (en) | Joint of crosslinked polyethylene insulated power cable, and connection method | |
| JPH0646845B2 (en) | Method for forming insulator of power cable connection | |
| JP2900096B2 (en) | Manufacturing method of rubber and plastic moldings | |
| JPS6333325Y2 (en) | ||
| JP2000152456A (en) | Connection method for cv cable | |
| JPS6036376B2 (en) | How to connect cross-linked polyethylene cable | |
| JPH0481492B2 (en) | ||
| JP2884372B2 (en) | Connection method of rubber / plastic power cable | |
| JPS5857278A (en) | Method of producing plastic insulated power cable connector | |
| JPS5832214Y2 (en) | Connection part of cross-linked polyethylene insulated cable | |
| JPS6116754Y2 (en) | ||
| JPH0613581Y2 (en) | Silicone rubber composite heat-shrinkable tube | |
| JPS5933129Y2 (en) | Bushings for wall penetration in cryogenic electrical equipment | |
| JPH04150714A (en) | Insulation block for power cable joint and power cable joint | |
| JP2822086B2 (en) | Connection method of rubber / plastic power cable | |
| JP2760043B2 (en) | Method of forming power cable connection | |
| JPS5998485A (en) | Gas sealing structure for molding die | |
| JPH07231531A (en) | Splicing of plastic power cable | |
| JPS5923626B2 (en) | How to seal heating tubes at wire and cable connections | |
| JPS6035910A (en) | Method of forming cable connector |