JP2618489B2 - Connection method of plastic insulated power cable - Google Patents
Connection method of plastic insulated power cableInfo
- Publication number
- JP2618489B2 JP2618489B2 JP1192543A JP19254389A JP2618489B2 JP 2618489 B2 JP2618489 B2 JP 2618489B2 JP 1192543 A JP1192543 A JP 1192543A JP 19254389 A JP19254389 A JP 19254389A JP 2618489 B2 JP2618489 B2 JP 2618489B2
- Authority
- JP
- Japan
- Prior art keywords
- cable
- insulating
- insulating block
- layer
- semiconductive layer
- 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.)
- Expired - Lifetime
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- Processing Of Terminals (AREA)
- Cable Accessories (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、プラスチック絶縁電力ケーブルの接続方法
に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for connecting a plastic insulated power cable.
架橋ポリエチレン電力ケーブルの超高圧線路への適用
が進むにつれ、線路建設を合理化する上で、接続作業時
間の短縮が大きな課題となってきている。すなわち電圧
階級154KV以上の架橋ポリエチレン電力ケーブルの接続
技術であるモールドジョイント工法は、安定した高い性
能が得られるものの、接続作業に要する時間が長いとい
う難点がある。このため工場で予め製作した絶縁部品を
現地で組み立てるいわゆるプレハブジョイントに対する
ニーズが高まっており、すでに154KV級のプレハブジョ
イントが開発され、実用化されようとしている。As the application of cross-linked polyethylene power cables to ultrahigh-voltage lines has progressed, reducing the connection work time has become a major issue in streamlining line construction. In other words, the mold joint method, which is a technique for connecting crosslinked polyethylene power cables of a voltage class of 154 KV or more, has a disadvantage that, although stable and high performance is obtained, the time required for the connection work is long. For this reason, there is an increasing need for so-called prefabricated joints for assembling insulating parts manufactured in advance at a factory, and 154KV-class prefabricated joints have already been developed and are being put to practical use.
しかしプレハブジョイントは補強絶縁体にエポキシや
ゴムを使用している関係で、架橋ポリエチレンのように
高い電気ストレスをかけられないため、接続部の寸法が
大きくなるという欠点があり、275KV級、500KV級の線路
ではスペース上の制約から適用箇所が制限されることが
予想される。However, prefabricated joints use epoxy or rubber for the reinforcement insulator, so they cannot apply high electric stress unlike crosslinked polyethylene, and therefore have the disadvantage of increasing the dimensions of the connection, and have the disadvantage of 275KV class and 500KV class. It is expected that the application location will be limited due to space restrictions.
このため、モールドジョイントの高い性能とプレハブ
ジョイントの簡便性をある程度兼ね備えた接続方法とし
て、接続部の補強絶縁体を絶縁ブロックとして予め工場
で製作しておき、現場ではそれをケーブル接続部に取り
付け、加熱してケーブル絶縁体と一体化するという方法
が提案されている。この場合、接続部絶縁ブロックは二
つ割（それ以上でも可）に分割されていることが取付け
作業性の面で好ましい。For this reason, as a connection method that combines the high performance of the mold joint and the simplicity of the prefabricated joint to some extent, a reinforcing insulator for the connection part is manufactured in advance as an insulating block in a factory, and it is attached to the cable connection part at the site, A method of heating and integrating with a cable insulator has been proposed. In this case, it is preferable in terms of mounting workability that the connecting portion insulating block is divided into two (or more).
しかし二つ割の接続部絶縁ブロックを使用すると次の
ような問題がある。すなわち接続部絶縁ブロックを用い
る場合には、導体を接続した後、その上に接続部内部半
導電層を設け、その上に接続部絶縁ブロックを取り付
け、加熱することになるが、このとき図−４に示すよう
に二つ割の絶縁ブロック1a・1bの合わせ目２が接着する
前に、接続部内部半導電層３が流動して合わせ目２内に
流れ込み、リブ状突起3Pを形成する場合がある。このよ
うな突起3Pは電気的な欠陥となるので、好ましくない。However, the use of a two-part insulating block has the following problems. That is, in the case of using the connecting part insulating block, after connecting the conductor, the connecting part inner semiconductive layer is provided thereon, the connecting part insulating block is mounted thereon, and heating is performed. As shown in FIG. 4, before the joint 2 of the two insulating blocks 1a and 1b is bonded, the semiconductive layer 3 inside the connection portion flows and flows into the joint 2 to form the rib-like projection 3P. There is. Such projections 3P are not preferable because they cause electrical defects.
また接続部絶縁ブロックの取付け精度や寸法精度の関
係で、図−５に示すように絶縁ブロック1a・1bの合わせ
目２に相当する内周面に段差が生じることがあり、この
ような段差ができると、接続部内部半導電層３がその通
りに成形されて段状突起3Qができる。このような突起3Q
も電気的な欠陥となる。In addition, due to the mounting accuracy and dimensional accuracy of the connection part insulating block, there may be a step on the inner peripheral surface corresponding to the joint 2 of the insulating blocks 1a and 1b as shown in FIG. When this is possible, the semiconductive layer 3 inside the connection part is formed as it is, and a step-like projection 3Q is formed. Such a protrusion 3Q
Is also an electrical defect.
さらに絶縁ブロックの内層部では、絶縁ブロックが相
互に接着する前に絶縁ブロックと接続部内部半導電層と
が接着するため、その後に絶縁ブロックが熱の影響で相
対的に移動したりすると、やはり接続部内部半導電層表
面に突起ができることになる。Further, in the inner layer portion of the insulating block, the insulating block and the semiconductive layer inside the connecting portion are bonded before the insulating blocks are bonded to each other. A protrusion is formed on the surface of the semiconductive layer inside the connection portion.
本発明は、上記のような課題を解決するため、導体を
接続した後、その上に両側のケーブル内部半導電層に跨
がるように接続部内部半導電層を設け、その上に両側の
ケーブル絶縁体に跨がるように、二つ割以上に分割され
た接続部絶縁ブロックを取り付け、加熱することによ
り、接続部絶縁ブロックとケーブル絶縁体とを一体化す
るプラスチック絶縁電力ケーブルの接続方法において、
上記接続部絶縁ブロックを取り付ける前に、接続部内部
半導電層上に絶縁介在層を設けることを特徴とするもの
である。The present invention, in order to solve the above problems, after connecting the conductor, provided on the connection portion inside semi-conductive layer so as to straddle the cable inside semi-conductive layer on both sides, on both sides of it A method of connecting a plastic insulated power cable that integrates the connecting part insulating block and the cable insulator by attaching and heating the connecting part insulating block divided into two or more parts so as to straddle the cable insulator At
Before attaching the connection part insulating block, an insulating intervening layer is provided on the connection part internal semiconductive layer.
接続部内部半導電層上に絶縁介在層を設けると、接続
部絶縁ブロックと接続部内部半導電層が直接接触しなく
なるため、接続部絶縁ブロックに隙間や段差が生じて
も、そこに絶縁介在層が部分的に流動して流れ込む程度
で済み、半導電性の突起や不整が発生するおそれがなく
なる。If an insulating intervening layer is provided on the connecting portion internal semiconductive layer, the connecting portion insulating block does not directly contact the connecting portion internal semiconductive layer. It is only necessary that the layer partially flows and flows, and there is no possibility that semiconductive protrusions or irregularities will occur.
〔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。Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
実施例１ 図−１は本発明の一実施例を示す。接続するケーブル
11A・11Bは、275KV 1400mm2の架橋ポリエチレン電力ケ
ーブル（ケーブル外部半導電層外径105mm、絶縁体外径1
03mm）である。ケーブル11A・11Bの端部は所定の寸法に
段剥ぎし、外部半導電層12A・12B、絶縁体13A・13B、内
部半導電層14A・14Bを露出させ、導体15A・15Bを口出し
する。導体15A・15Bを接続する前に、半導電性熱収縮チ
ューブ、架橋用ガスバリアー層、架橋用加圧管のパッキ
ング等の部品をケーブル11A側または11B側に外挿してお
く。Embodiment 1 FIG. 1 shows an embodiment of the present invention. Cable to connect
11A and 11B are 275KV 1400mm 2 crosslinked polyethylene power cables (cable outer semiconductive layer outer diameter 105mm, insulator outer diameter 1
03mm). The ends of the cables 11A and 11B are stripped to predetermined dimensions to expose the outer semiconductive layers 12A and 12B, the insulators 13A and 13B, and the inner semiconductive layers 14A and 14B, and expose the conductors 15A and 15B. Before connecting the conductors 15A and 15B, components such as a semiconductive heat-shrinkable tube, a gas barrier layer for cross-linking, and packing of a pressure tube for cross-linking are extrapolated to the cable 11A or 11B side.
接続作業は、まず導体15A・15Bを突き合わせ、銀ろう
16で溶接接続する。この溶接は、両側のケーブル絶縁体
13A・13Bに熱による悪影響を与えないように溶接部の両
側の導体露出部を冷却しながら行う。次に導体接続部の
外周に半導電性ポリエチレンテープをケーブルの内部導
電層14A・14Bに跨がるように巻き付け、加熱モールドし
て接続部内部半導電層17を形成する。For connection work, first match conductors 15A and 15B,
Connect by welding at 16. This weld is a cable insulation on both sides
This is performed while cooling the exposed conductor on both sides of the welded portion so that heat is not adversely affected on 13A and 13B. Next, a semiconductive polyethylene tape is wound around the outer periphery of the conductor connection part so as to straddle the inner conductive layers 14A and 14B of the cable, and heated and molded to form the connection part inner semiconductive layer 17.
その後、架橋剤入りで未架橋のポリエチレンテープを
厚さ1mm程度になるように巻き付け、絶縁介在層18を形
成する。絶縁介在層18は図示のように両端がケーブル絶
縁体13A・13Bのテーパー部にかかるように形成すること
が好ましい。Thereafter, an uncrosslinked polyethylene tape containing a crosslinking agent is wound so as to have a thickness of about 1 mm to form the insulating intermediate layer 18. It is preferable that the insulating intervening layer 18 be formed so that both ends are over the tapered portions of the cable insulators 13A and 13B as shown in the figure.
次に、二つ割で片側が図−２のような形をした架橋剤
入り未架橋の接続部絶縁ブロック19を窒素ガス充填密閉
容器から取り出し、ケーブル絶縁体13A・13Bの跨がるよ
うに組み付ける。絶縁ブロック19は長さ500mm、外径123
mmである。その後、絶縁ブロック19上に半導電性熱収縮
チューブを両端がケーブル外部半導電層12A・12B上に載
るように被せて加熱収縮させ、接続部の外部半導電層20
を形成する。Next, the cross-linking agent-containing uncrosslinked connecting portion insulating block 19 having a shape as shown in FIG. 2 on one side is taken out of the sealed container filled with nitrogen gas, and is straddled by the cable insulators 13A and 13B. Assemble. Insulation block 19 is 500mm long and 123 OD
mm. Thereafter, a semiconductive heat-shrinkable tube is placed on the insulating block 19 so that both ends thereof are placed on the cable outer semiconductive layers 12A and 12B, and the tube is heated and shrunk.
To form
次いで、その上にガスバリアー層を被覆し、架橋用加
圧管を取り付けて、加圧、加熱することにより、絶縁ブ
ロック19および絶縁介在層18を架橋すると共に、ケーブ
ル絶縁体13A・13Bと絶縁ブロック19と絶縁介在層18と接
続部内部半導電層17とを融着一体化させる。加熱条件は
220℃に昇温し、６時間保持した後、冷却するという条
件である。Next, a gas barrier layer is coated thereon, and a pressurizing tube for cross-linking is attached thereto, and the pressurizing and heating are performed to cross-link the insulating block 19 and the insulating intervening layer 18 and to connect the cable insulators 13A and 13B with the insulating block. 19, the insulating intermediate layer 18, and the connection portion internal semiconductive layer 17 are fused and integrated. Heating conditions are
The condition is that the temperature is raised to 220 ° C., held for 6 hours, and then cooled.
一方、比較のため、上記実施例と同じケーブルを用い
た同一寸法の接続部で、絶縁介在層を設けずに、接続部
内部半導電層上に直接二つ割の絶縁ブロックを取り付け
たものを組み立てた。加熱条件も上記実施例と同じであ
る。On the other hand, for comparison, a connection part of the same dimensions using the same cable as that of the above-described embodiment, without providing an insulating intervening layer, and attaching a split insulating block directly to the connection part internal semiconductive layer was used. Assembled. The heating conditions are the same as in the above embodiment.
以上のようにして得られた２種類の接続部に、それぞ
れ所定の遮蔽層を施し、電気試験を実施した。その結果
を表−１に示す。A predetermined shielding layer was applied to each of the two types of connection portions obtained as described above, and an electrical test was performed. Table 1 shows the results.
実施例１による接続部の破壊値は275KV級として十分
満足できる値であり、破壊箇所も絶縁ブロックの合わせ
目に起因する箇所ではないことから、本発明の有効性が
わかる。 The breakdown value of the connection portion according to the first embodiment is a sufficiently satisfactory value of 275 KV class, and the failure location is not a location caused by the joint of the insulating blocks.
実施例２ 接続するケーブルは実施例１と同じである。導体の接
続は圧縮スリーブで行い、その上に半導電性熱収縮チュ
ーブを被せて加熱収縮させ、両端をガラスで削って、ケ
ーブル内部半導電層と滑らか接続された接続部内部半導
電層を形成した。次にその上にポリエチレン熱収縮チュ
ーブを被せ、加熱収縮させて絶縁介在層を形成した。そ
の後は実施例１と同様に接続部絶縁ブロックを取り付
け、接続部外部半導電層を形成し、加圧管を被せて加圧
加熱し、架橋を行った。Embodiment 2 The cables to be connected are the same as in Embodiment 1. The connection of the conductor is made with a compression sleeve, a semiconductive heat shrink tube is put on it, it is shrunk by heating, and both ends are shaved with glass to form a semiconductive layer inside the connection part that is smoothly connected to the semiconductive layer inside the cable did. Next, a polyethylene heat-shrinkable tube was put on the heat-shrinkable tube, followed by heat shrinkage to form an insulating intermediate layer. After that, a connection part insulating block was attached in the same manner as in Example 1, a connection part external semiconductive layer was formed, and a pressure tube was placed thereon, followed by pressurizing and heating to effect crosslinking.
このようにして得られた接続部を解体し、接続部内部
半導電層の突起の大きさを調べると共に、接続部内部半
導電層−絶縁介在層間、絶縁介在層−接続部絶縁ブロッ
ク間の接着力を界面の引き裂き力で測定した。その結果
を表−２に示す。The connection portion thus obtained is disassembled, the size of the protrusion of the connection portion internal semiconductive layer is checked, and the bonding between the connection portion internal semiconductive layer and the insulating interlayer and between the insulating interlayer and the connecting portion insulating block are performed. Force was measured by the tear force at the interface. Table 2 shows the results.
接着力は図−３に示すように厚さ0.5mmのスライス試
料の接着境界にノッチを入れ、矢印方向に引き裂いたと
きの荷重である。 The adhesive force is the load when a notch is made at the adhesive boundary of a slice sample having a thickness of 0.5 mm as shown in FIG.
この結果によれば、接続部内部半導電層の突起は十分
小さく、かつ各界面の接着力も十分である。According to this result, the protrusion of the semiconductive layer inside the connection portion is sufficiently small, and the adhesive force at each interface is also sufficient.
なお上記実施例では接続部絶縁ブロックとして、架橋
剤入りで未架橋のものを使用したが、すでに架橋してあ
るものを使用することも可能である。In the above embodiment, a non-cross-linked insulating block containing a cross-linking agent is used as the insulating block, but a cross-linked block may be used.
以上説明したように本発明によれば、接続部内部半導
電層上に絶縁介在層を設けた上で接続部絶縁ブロックを
取り付けるようにしたので、絶縁ブロックの合わせ目に
僅かな隙間や段差が生じても絶縁介在層がそれを吸収
し、接続部内部半導電層の表面に突起が形成されること
がなくなる。したがって電気的欠陥のない、性能の安定
した接続部を得ることができる。As described above, according to the present invention, the connecting portion insulating block is attached after providing the insulating intervening layer on the connecting portion internal semiconductive layer, so that a slight gap or step is formed at the joint of the insulating blocks. Even if it occurs, the insulating intervening layer absorbs it and no projection is formed on the surface of the semiconductive layer inside the connection portion. Therefore, it is possible to obtain a connection part with no electrical defects and stable performance.
図−１は本発明に係る接続方法の一実施例を示す断面
図、図−２はそれに使用する接続部絶縁ブロックの斜視
図、図−３は接着力測定方法の説明図、図−４および図
−５は従来の接続方法の問題点を示す説明図である。 11A・11B:架橋ポリエチレン電力ケーブル、12A・12B:外
部半導電層、13A・13:絶縁体、14A・14B:内部半導電
層、15A・15B:導体、16:銀ろう、17:接続部内部半導電
層、18:絶縁介在層、19:接続部絶縁ブロック、20:接続
部外部半導電層。FIG. 1 is a cross-sectional view showing one embodiment of the connection method according to the present invention, FIG. 2 is a perspective view of a connection portion insulating block used in the connection method, FIG. FIG. 5 is an explanatory diagram showing a problem of the conventional connection method. 11A / 11B: Cross-linked polyethylene power cable, 12A / 12B: External semiconductive layer, 13A / 13: Insulator, 14A / 14B: Internal semiconductive layer, 15A / 15B: Conductor, 16: Silver solder, 17: Inside connection part Semiconductive layer, 18: insulating intervening layer, 19: connecting part insulating block, 20: connecting part external semiconductive layer.
Claims (1)
ル内部半導電層に跨がるように接続部内部半導電層を設
け、その上に両側のケーブル絶縁体に跨がるように、二
つ割以上に分割された接続部絶縁ブロックを取り付け、
加熱することにより、接続部絶縁ブロックとケーブル絶
縁体とを一体化するプラスチック絶縁電力ケーブルの接
続方法において、上記接続部絶縁ブロックを取り付ける
前に、接続部内部半導電層上に絶縁介在層を設けること
を特徴とするプラスチック絶縁電力ケーブルの接続方
法。After connecting a conductor, a connecting portion internal semiconductive layer is provided thereon so as to straddle the cable internal semiconductive layers on both sides thereof, and is further provided so as to straddle the cable insulators on both sides thereof. Attach the connecting block insulating block divided into two or more parts,
In the method for connecting a plastic insulated power cable that integrates a connecting portion insulating block and a cable insulator by heating, an insulating intervening layer is provided on the connecting portion internal semiconductive layer before attaching the connecting portion insulating block. A method for connecting a plastic insulated power cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1192543A JP2618489B2 (en) | 1989-07-27 | 1989-07-27 | Connection method of plastic insulated power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1192543A JP2618489B2 (en) | 1989-07-27 | 1989-07-27 | Connection method of plastic insulated power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0360314A JPH0360314A (en) | 1991-03-15 |
| JP2618489B2 true JP2618489B2 (en) | 1997-06-11 |
Family
ID=16293029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1192543A Expired - Lifetime JP2618489B2 (en) | 1989-07-27 | 1989-07-27 | Connection method of plastic insulated power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2618489B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0623029U (en) * | 1992-05-14 | 1994-03-25 | 共和眼鏡株式会社 | Synthetic resin spectacle temple with core wire |
-
1989
- 1989-07-27 JP JP1192543A patent/JP2618489B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0360314A (en) | 1991-03-15 |
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