JPS63228910A - Method of forming joint of cross-linked polyethylene insulated cable - Google Patents
Method of forming joint of cross-linked polyethylene insulated cableInfo
- Publication number
- JPS63228910A JPS63228910A JP62063358A JP6335887A JPS63228910A JP S63228910 A JPS63228910 A JP S63228910A JP 62063358 A JP62063358 A JP 62063358A JP 6335887 A JP6335887 A JP 6335887A JP S63228910 A JPS63228910 A JP S63228910A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- cable
- insulator
- reinforcing insulator
- insulated cable
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 12
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims description 4
- 239000004703 cross-linked polyethylene Substances 0.000 title claims description 4
- 239000012212 insulator Substances 0.000 claims description 28
- 230000003014 reinforcing effect Effects 0.000 claims description 18
- 229920000098 polyolefin Polymers 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims 1
- -1 polyethylene Polymers 0.000 claims 1
- 229920000573 polyethylene Polymers 0.000 claims 1
- 238000007796 conventional method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は架橋ポリエチレン絶縁ケーブル（以下Ｃｖケー
ブルと略称する）のモールドによる接続部補強絶縁体の
形成方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for forming a reinforcing insulator at a connection portion of a crosslinked polyethylene insulated cable (hereinafter abbreviated as Cv cable) by molding.
（従来技術）
第２図は従来のＣＶケーブルの接続部形成方法における
金型の縦断面図である。図中（１）はケーブルの導体接
続部、■は架橋ポリエチレン絶縁体、を内包して金型Ｏ
Ｇをセットし、該金型００の内部空間ＯＤに樹脂注入口
（１２１より溶融ポリオレフィンを注入、充填し、しか
る後冷却固化せしめて接続部補強絶縁体を形成する。(Prior Art) FIG. 2 is a longitudinal cross-sectional view of a mold in a conventional method for forming a connection portion of a CV cable. In the figure, (1) is the conductor connection part of the cable, ■ is the cross-linked polyethylene insulator, and the mold O
G is set, and the internal space OD of the mold 00 is injected and filled with molten polyolefin through the resin injection port (121), and then cooled and solidified to form a connection reinforcing insulator.
この除用いる金型０■の内部空間０Ｄの形状、寸法は接
続部の補強絶縁体の最終仕−１ニリ寸法に近い寸法（溶
融樹脂の固化収縮を見込んて若干大きく設計するが）の
ものであった。The shape and dimensions of the internal space 0D of the mold 0 to be removed are close to the final dimension of the reinforcing insulator at the connection part (although it is designed to be slightly larger in anticipation of solidification shrinkage of the molten resin). there were.
（解決しようとする問題点）
上述した従来の方法でモールド成形した接続部補強絶縁
体はその立」ユリ部（第２図Ａ部）が電気的弱点であっ
た。その理由は次の通りである。(Problems to be Solved) The connection reinforcing insulator molded by the above-described conventional method has an electrical weak point in its bulge portion (section A in FIG. 2). The reason is as follows.
■ケーブル絶縁体■表面に存在した微小異物が中央部か
ら両端部への注入樹脂の流れのため、両端のＡ部付近に
移動して溜まる。■ Cable Insulator ■ Due to the flow of the injected resin from the center to both ends, minute foreign matter existing on the surface moves and accumulates near part A at both ends.
■冷却時、両端部の冷えが速く、ケーブル絶縁体■とそ
の上に形成された補強絶縁体の境界面に剥離が生じる。■During cooling, both ends cool quickly and peeling occurs at the interface between the cable insulator (■) and the reinforcing insulator formed on it.
■ケーブルの外部半導電層（３）を除去した部分のケー
ブル絶縁体■」二に金型端があること及びこの部分は高
温となるためケーブル絶縁体はＡ点付近で変形し易い。■Cable insulator in the area where the outer semiconducting layer (3) of the cable has been removed ■``Secondly, there is a mold end, and this area becomes hot, so the cable insulator is easily deformed near point A.
等のためである。etc.
（問題点を解決するための手段）
本発明は−１−述の問題点を解消したＣＶケーブルの接
続部の形成方法を提供するもので、その特徴は、溶融ポ
リオレフィンが充ＪＪｉされる金型の内部空間の長さが
補強絶縁体の最終仕−１−り寸法より長い金型を用いて
充ｊ１ Ｌ、 、冷却後、金型成形された上記ポリオレ
フィン成形体の両端部を除去することにより所望の接続
部補強絶縁体を形成することにある。(Means for Solving the Problems) The present invention provides a method for forming a connection part of a CV cable that solves the problems mentioned in -1- above. By using a mold in which the length of the internal space is longer than the final dimension of the reinforcing insulator, after cooling, both ends of the molded polyolefin molded body are removed. The purpose is to form a desired connection reinforcing insulator.
第１図は本発明のＣＶケーブルの接続部形成方法におけ
る金型の縦断面図で、第２図と同一記号は同一部位をあ
られしている。FIG. 1 is a longitudinal cross-sectional view of a mold in the method for forming a connection portion of a CV cable according to the present invention, and the same symbols as in FIG. 2 indicate the same parts.
本発明において使用する金型０（１１の内部空間ＯＤの
長さくＱ）は、最終仕」ユリ寸法（１１ｔＬ）の他に仕
」−げ時除去する部分（＋＋９）たけ長くなっている。The mold 0 (length Q of the internal space OD of 11) used in the present invention is longer by the length (++9) of the part to be removed during finishing in addition to the final finish dimension (11 tL).
このような金型００の内部空間ＯＤに樹脂注入口＋１２
１より溶融ポリオレフィンを注入、充填し成形する。冷
却後上記ポリオレフィン成形体を金型００から取り出し
、前記金型０ＣＩＩの内部空間ＯＤの両端部（ｌＬ６）
を除去し、所定の寸法を持った補強絶縁体を形成する。Resin injection port +12 is placed in the internal space OD of such a mold 00.
From step 1, molten polyolefin is injected, filled and molded. After cooling, the polyolefin molded body is taken out from the mold 00 and placed at both ends (lL6) of the internal space OD of the mold 0CII.
is removed to form a reinforcing insulator with predetermined dimensions.
なお、金型成形時には両側部分（＋ ｒ６ ）が位置す
るケーブル表面にはテフロンテープ等を巻回して、仕−
Ｌげ時両側部分（＋１１！Ｉ）の成形体がケーブルより
剥離し易いようにしておくのが望ましい。In addition, during mold molding, Teflon tape or the like is wrapped around the cable surface where both side parts (+r6) are located.
It is desirable that the molded bodies on both sides (+11!I) be more easily peeled off than the cable when the cable is bent.
（作用）
上述した本発明の接続部形成方法によれば前述の■〜■
の問題点が一挙に解決される。即ち、■絶縁体■表面に
存在した異物が溜まるのは第１図のＢ部付近であり、こ
の部分は仕上げ時に除去されるので、補強絶縁体の両端
のＡ部付近には異物が存在しなくなる。(Function) According to the connection part forming method of the present invention described above, the above-mentioned ■ to ■
problems are solved all at once. In other words, the foreign matter that existed on the surface of the insulator accumulates near section B in Figure 1, and this section is removed during finishing, so there is no foreign matter near section A at both ends of the reinforcing insulator. It disappears.
■第１図ではＡ部付近は金型端から離れているので、こ
の部分で急激な冷却は生ぜず、従って絶縁体■界面との
接着が良好となる。(2) In FIG. 1, the area around A is far from the mold edge, so rapid cooling does not occur in this area, and therefore good adhesion with the insulator (2) interface is achieved.
■金型端がケーブル絶縁体■のむき出し部より離れて位
置しているので、第１図のＡ部付近の変形は殆んどない
。又Ｂ部付近は第２図のＡ部付近より温度が低いので変
形は少なく、又変形したとしても外部半導電層（３）が
あるので、電気性能への影響は小さい。■Since the end of the mold is located away from the exposed part of the cable insulator ■, there is almost no deformation near section A in FIG. Also, since the temperature near part B is lower than that near part A in FIG. 2, there is little deformation, and even if deformation occurs, the influence on electrical performance is small because of the presence of the external semiconductive layer (3).
上述のような効果は金型の内部空間の長さが長い程大き
くなるが、本願発明者の経験から、５０□（片側の長さ
）以」二で効果が顕著にあられれること及び２００ｍｍ
（同）以上としてもあまり効果が変わらないことから
、金型の内部空間の長さは、補強絶縁体の最終仕−１ニ
リ寸法より片側で５０〜２００關程度長くすることが望
ましい。The above-mentioned effect becomes greater as the length of the internal space of the mold becomes longer, but from the experience of the inventor of the present application, the effect is noticeable when the length of one side is less than 50 mm, and when the length of the inner space of the mold is 200 mm.
(Same) Since the effect does not change much even with the above, it is desirable that the length of the internal space of the mold is approximately 50 to 200 degrees longer on one side than the final dimension of the reinforcing insulator.
（実施例）
＋５４ｋＶ、 ２０００１Ｉｍ ”のＣＶケーブルにつ
いて、従来方法と本発明の方法で各５点押出しモールド
接続部を形成し、交流破壊試験を実施した。(Example) For a +54kV, 20001Im'' CV cable, five-point extrusion mold connections were formed using the conventional method and the method of the present invention, and an AC destructive test was conducted.
結果、従来方法では４点が補強絶縁体立上り部で破壊し
たが、本発明の方法では上記立」ユリ部での破壊は０点
であった。As a result, in the conventional method, there were 4 fractures at the rising portion of the reinforcing insulator, but in the method of the present invention, there were 0 fractures at the ridge portion.
なお、ケーブル絶縁体厚さは２３鰭、補強絶縁体厚さは
２５ｍｍである。The thickness of the cable insulator was 23 mm, and the thickness of the reinforcing insulator was 25 mm.
（発明の効果）
上述した本発明のＣＶケーブルの接続部形成方法によれ
ば、従来弱点とされていた補強絶縁体立上り部が大幅に
改善されて接続部の電気的性能が著しく向上すると共に
、立上り付近の良好な性能を実現するための接続部製造
条件及びその管理が著しく容易となる。特に現場作業で
の気温、粉塵等変動条件に左右されることが少なくなる
ので、ケーブル布設現場での接続作業性が著しく向」二
する。(Effects of the Invention) According to the above-described method for forming a connection portion of a CV cable of the present invention, the rising portion of the reinforcing insulator, which has conventionally been considered a weak point, is significantly improved, and the electrical performance of the connection portion is significantly improved. The manufacturing conditions for the connection part and its management for achieving good performance near the rising edge become significantly easier. In particular, since it is less affected by fluctuating conditions such as temperature and dust during on-site work, the ease of connection work at cable installation sites is significantly improved.
第１図は本発明の接続部形成方法における金型の縦断面
図、第２図は従来の方法における金型の縦断面図である
。
１・・・導体接続部、２・・・ケーブル絶縁体、３・・
・ケーブル外部半導電層、１０・・・金型、■・・・金
型内部空間、ＩＩ＾・・・補強絶縁体最終仕上り寸法、
＋１９・・・除去部。FIG. 1 is a vertical cross-sectional view of a mold in the connection portion forming method of the present invention, and FIG. 2 is a vertical cross-sectional view of a mold in a conventional method. 1... Conductor connection part, 2... Cable insulator, 3...
・Cable external semiconductive layer, 10... Mold, ■... Mold internal space, II^... Final finished dimensions of reinforcing insulator,
+19...Removal section.
Claims (2)
部空間に溶融ポリオレフィンを充填して接続部補強絶縁
体を形成する方法において、上記溶融ポリオレフィンが
充填される金型の内部空間の長さが補強絶縁体の最終仕
上り寸法より長い金型を用いて充填し、冷却後、金型成
形された上記ポリオレフィン成形体の両端部を除去する
ことにより所望の接続部補強絶縁体を形成することを特
徴とする架橋ポリエチレン絶縁ケーブルの接続部形成方
法。(1) In a method of setting a mold containing a conductor connection part and filling the internal space of the mold with molten polyolefin to form a connection part reinforcing insulator, the inside of the mold is filled with the molten polyolefin. The space is filled using a mold whose length is longer than the final finished dimension of the reinforcing insulator, and after cooling, both ends of the molded polyolefin molded body are removed to form the desired joint reinforcing insulator. 1. A method for forming a connection portion of a cross-linked polyethylene insulated cable.
寸法より片側で５０〜２００ｍｍ長いことを特徴とする
特許請求の範囲第１項記載の架空ポリエチレン絶縁ケー
ブルの接続部形成方法。(2) The method for forming a connection portion of an overhead polyethylene insulated cable according to claim 1, wherein the length of the internal space of the mold is 50 to 200 mm longer on one side than the final finished dimension of the reinforcing insulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62063358A JPH07101965B2 (en) | 1987-03-17 | 1987-03-17 | Cross-linked polyethylene insulation cable connection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62063358A JPH07101965B2 (en) | 1987-03-17 | 1987-03-17 | Cross-linked polyethylene insulation cable connection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63228910A true JPS63228910A (en) | 1988-09-22 |
| JPH07101965B2 JPH07101965B2 (en) | 1995-11-01 |
Family
ID=13226949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62063358A Expired - Fee Related JPH07101965B2 (en) | 1987-03-17 | 1987-03-17 | Cross-linked polyethylene insulation cable connection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07101965B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05122819A (en) * | 1991-10-29 | 1993-05-18 | Tokyo Electric Power Co Inc:The | Power cable joint |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58133108A (en) * | 1982-01-30 | 1983-08-08 | 株式会社フジクラ | Method of cutting stress corn |
| JPS58124020U (en) * | 1982-02-15 | 1983-08-23 | 株式会社フジクラ | Stress cone finisher for high pressure cable mold joints |
| JPS6169317A (en) * | 1984-09-12 | 1986-04-09 | 日立電線株式会社 | Insulating member molding method to lead for electric device |
-
1987
- 1987-03-17 JP JP62063358A patent/JPH07101965B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58133108A (en) * | 1982-01-30 | 1983-08-08 | 株式会社フジクラ | Method of cutting stress corn |
| JPS58124020U (en) * | 1982-02-15 | 1983-08-23 | 株式会社フジクラ | Stress cone finisher for high pressure cable mold joints |
| JPS6169317A (en) * | 1984-09-12 | 1986-04-09 | 日立電線株式会社 | Insulating member molding method to lead for electric device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05122819A (en) * | 1991-10-29 | 1993-05-18 | Tokyo Electric Power Co Inc:The | Power cable joint |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07101965B2 (en) | 1995-11-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |