JP3638240B2 - Prefabricated connection for plastic cable and its assembly method - Google Patents
Prefabricated connection for plastic cable and its assembly method Download PDFInfo
- Publication number
- JP3638240B2 JP3638240B2 JP35991999A JP35991999A JP3638240B2 JP 3638240 B2 JP3638240 B2 JP 3638240B2 JP 35991999 A JP35991999 A JP 35991999A JP 35991999 A JP35991999 A JP 35991999A JP 3638240 B2 JP3638240 B2 JP 3638240B2
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- JP
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- Prior art keywords
- insulator
- cable
- surface pressure
- prefabricated
- plastic
- 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.)
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- Cable Accessories (AREA)
Description
【0001】
【産業上の利用分野】
本発明は例えばCVケーブル(架橋ポリエチレン絶縁電力ケーブル)等のプレハブ型接続部とその組立方法に関するものである。
【0002】
【従来の技術】
CVケーブル等のプレハブ型接続部の組立ては、ケーブル絶縁体の端末上にあらかじめ成形したプレモールド絶縁体を挿入して行なう。そして上記プレモールド絶縁体の内筒部の径はケーブル絶縁体の外径より小さく成形されているため、挿入に際してはケーブル絶縁体の外表面及びプレモールド絶縁体の内周面にシリコーンオイル等の潤滑油を塗布して挿入していた。
【0003】
【発明が解決しようとする課題】
上述した従来のプレモールド絶縁体の挿入工法は大気中で実施されるため、充分に脱気したシリコーンオイルを塗布したとしても、シリコーンオイルの塗布時にボイドを巻き込み、及びプレモールド絶縁体挿入時にボイドを巻き込み、これら巻き込んだボイドがケーブル絶縁体の外周面とプレモールド絶縁体の内面の界面に残存することがあった。66〜77kV級のプレモールド絶縁体は上面界面長が比較的短く、巻き込んだボイドは接続部の組立てにおいて後方よりスプリングで押して圧力をかけることにより逃がすことができるが、 275kV級の超高圧用ケーブルのプレモールド絶縁体では界面長が長く、充分にボイドを逃がすことが困難であり、このボイドが接続部の絶縁性能低下の一要因となっていた。
【0004】
【課題を解決するための手段】
本発明は上述の問題点を解消し、巻き込みボイドの発生を防止し、安定した絶縁性能を有するプレハブ接続部の組立方法を提供するもので、その第1の特徴は、ケーブル絶縁体の外周にプレモールド絶縁体を具えるプラスチックケーブル用プレハブ接続部において、前記プレモールド絶縁体は、内筒部の中央部から両側に向って0.2deg 以上の角度で拡径したテーパを具えることにある。
【0005】
また、上記接続部の組み立て方法は、プレモールド絶縁体の内筒部の空間を密閉構造とし、該空間部を真空引きした後、絶縁油を充填して加圧した状態でプレモールド絶縁体をケーブル絶縁体上に挿入することを特徴とする。
【0006】
第2の特徴は、ケーブル絶縁体の外周にプレモールド絶縁体を具えるプラスチックケーブル用プレハブ接続部において、前記ケーブル絶縁体を、ケーブル半導電層の近傍からケーブル絶縁体端部に向って0.5deg以上の角度で縮径したテーパ状としたことにある。
【0007】
また、この接続部の組み立て方法は、プレモールド絶縁体の外周上に半割れカバーを取付けて密閉構造とし、上記半割れカバー内部を真空引きした後絶縁油を充填し、該絶縁油を充填した状態でプレモールド絶縁体をケーブル絶縁体上に挿入することを特徴とする。
【0008】
【発明の実施の形態】
図1を用いて本発明における第1の特徴を説明する。図1は、プレモールド絶縁体を所定の位置に挿入した状態の縦断面図である。
本具体例においては、プレモールド絶縁体4の内筒部の中央部Aから両側に向って、その径を0.2deg以上の角度で拡径したテーパ21,22を形成してある。これによりプレモールド絶縁体4をケーブル絶縁体1上に挿入したとき、プレモールド絶縁体1の内筒部の中央部Aにおいて面圧が最大となり、この面圧はプレモールド絶縁体1の端部にいくに従って小さくなり、プレモールド絶縁体1の内周面とケーブル絶縁体1外表面の界面に存在するボイドを両側に逃がすことが可能となる。なお、この場合、前述の図1あるいは図2に示す具体例と併せ用いることができることはいうまでもない。
【0009】
図2を用いて本発明における第2の特徴を説明する。図2は、プレモールド絶縁体を所定の位置に挿入した状態の縦断面図である。図面において、図1と同一符号は同一部位をあらわしている。
【0010】
本具体例においては、ケーブル絶縁体1の外径をケーブルの外部半導電層2近傍からケーブル絶縁体端部に向って0.5deg以上の角度で縮径したテーパ31状に形成してある。これによりプレモールド絶縁体4をケーブル絶縁体1上に挿入したとき、ケーブル絶縁体1の端部に向うに従って面圧が小さくなり、プレモールド絶縁体4内周面とケーブル絶縁体1外表面の界面に存在するボイドを、ケーブル絶縁体1の端部方向に逃がすことが可能となる。
【0011】
【発明の効果】
以上説明したように、本発明のプラスチックケーブル用プレハブ接続部および組立方法によれば、接続部の絶縁性能低下の一要因であるボイドを巻き込むことがないので、安定した絶縁性能を有するプレハブ型接続部を形成することができ、特に超高圧のプラスチックケーブルのプレハブ型接続部の形成に利用するとき効果的である。
【図面の簡単な説明】
【図1】本発明における第1の特徴を示すケーブル接続部の縦断面図である。
【図2】本発明における第2の特徴を示すケーブル接続部の縦断面図である。
【符号の説明】
1 ケーブル絶縁体
2 ケーブル外部半導電層
3 ケーブル導体
4 プレモールド絶縁体
21,22 プレモールド絶縁体内筒部テーパ
31 ケーブル絶縁体テーパ[0001]
[Industrial application fields]
The present invention relates to a prefabricated connecting portion such as a CV cable (cross-linked polyethylene insulated power cable) and an assembling method thereof.
[0002]
[Prior art]
Assembling of the prefabricated connection portion such as a CV cable is performed by inserting a pre-molded insulator formed in advance on the end of the cable insulator. And since the diameter of the inner cylinder part of the pre-mold insulator is formed smaller than the outer diameter of the cable insulator, silicone oil or the like is applied to the outer surface of the cable insulator and the inner peripheral surface of the pre-mold insulator when inserting. Lubricating oil was applied and inserted.
[0003]
[Problems to be solved by the invention]
Since the conventional pre-mold insulator insertion method described above is carried out in the atmosphere, even if a sufficiently degassed silicone oil is applied, a void is involved when the silicone oil is applied, and a void is inserted when the pre-mold insulator is inserted. These voids may remain at the interface between the outer peripheral surface of the cable insulator and the inner surface of the pre-mold insulator. The 66-77kV class pre-molded insulator has a relatively short upper interface length, and the voids involved can be released by pushing the spring from the rear and applying pressure when assembling the connection part. In the pre-molded insulator, the interface length is long, and it is difficult to sufficiently release the void.
[0004]
[Means for Solving the Problems]
The present invention provides a method for assembling a prefabricated connecting portion that solves the above-described problems, prevents the occurrence of entrainment voids, and has stable insulation performance. The first feature of the present invention is the outer periphery of a cable insulator. In the prefabricated connecting portion for a plastic cable having a pre-molded insulator, the pre-molded insulator has a taper whose diameter is increased at an angle of 0.2 ° or more from the central part of the inner cylinder part toward both sides.
[0005]
In addition, the method for assembling the connecting portion is such that the space of the inner cylinder portion of the premold insulator is sealed, and the space portion is evacuated and then filled with insulating oil and pressurized. It is inserted on a cable insulator.
[0006]
The second feature is that, in the prefabricated connecting portion for a plastic cable having a premolded insulator on the outer periphery of the cable insulator, the cable insulator is moved from the vicinity of the cable semiconductive layer toward the end of the cable insulator by 0.5 deg. The taper shape is reduced in diameter at the above angle.
[0007]
In addition, the method for assembling the connection part is to attach a half-cracked cover on the outer periphery of the pre-molded insulator to form a sealed structure. The premolded insulator is inserted on the cable insulator in a state.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The first feature of the present invention will be described with reference to FIG. FIG. 1 is a longitudinal sectional view showing a state in which a pre-mold insulator is inserted into a predetermined position.
In this specific example,
[0009]
The second feature of the present invention will be described with reference to FIG. FIG. 2 is a longitudinal sectional view showing a state in which the pre-mold insulator is inserted into a predetermined position. In the drawing, the same reference numerals as those in FIG. 1 represent the same parts.
[0010]
In this specific example, the outer diameter of the cable insulator 1 is formed in a
[0011]
【The invention's effect】
As described above, according to the prefabricated connecting part for plastic cable and the assembling method of the present invention, no voids that cause a decrease in the insulating performance of the connecting part are involved, so that the prefabricated connection having stable insulating performance is obtained. This is particularly effective when used to form a prefabricated connection for an ultra-high pressure plastic cable.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a cable connecting portion showing a first feature of the present invention.
FIG. 2 is a longitudinal sectional view of a cable connection portion showing a second feature of the present invention.
[Explanation of symbols]
1
21, 22 Premolded insulation body cylinder taper
31 Cable insulation taper
Claims (4)
前記プレモールド絶縁体は、内筒部の中央部において面圧が最大となり、プレモールド絶縁体の端部にいくに従って面圧が小さくなるように、中央部から両側に向って0.2deg以上の角度で拡径したテーパを具えることを特徴とするプラスチックケーブル用プレハブ接続部。In the prefabricated connection part for plastic cables having a pre-molded insulator on the outer periphery of the cable insulator,
The pre-mold insulator has an angle of 0.2 deg or more from the center to both sides so that the surface pressure becomes maximum at the center of the inner cylinder and the surface pressure decreases toward the end of the pre-mold insulator. A prefabricated joint for plastic cables, characterized by having a taper that is expanded in diameter.
前記ケーブル絶縁体は、その端部に向うに従って面圧が小さくなるように、ケーブル半導電層の近傍からケーブル絶縁体端部に向って0.5deg以上の角度で縮径したテーパ状であることを特徴とするプラスチックケーブル用プレハブ接続部。In the prefabricated connection part for plastic cables having a pre-molded insulator on the outer periphery of the cable insulator,
The cable insulator has a tapered shape whose diameter is reduced at an angle of 0.5 deg or more from the vicinity of the cable semiconductive layer toward the end of the cable insulator so that the surface pressure decreases toward the end. A prefabricated connection for plastic cables.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP35991999A JP3638240B2 (en) | 1992-04-06 | 1999-12-17 | Prefabricated connection for plastic cable and its assembly method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4113994A JP3052299B2 (en) | 1992-04-06 | 1992-04-06 | Assembling method of prefabricated connection part for plastic cable |
JP35991999A JP3638240B2 (en) | 1992-04-06 | 1999-12-17 | Prefabricated connection for plastic cable and its assembly method |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4113994A Division JP3052299B2 (en) | 1992-04-06 | 1992-04-06 | Assembling method of prefabricated connection part for plastic cable |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000152455A JP2000152455A (en) | 2000-05-30 |
JP3638240B2 true JP3638240B2 (en) | 2005-04-13 |
Family
ID=34525128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP35991999A Expired - Fee Related JP3638240B2 (en) | 1992-04-06 | 1999-12-17 | Prefabricated connection for plastic cable and its assembly method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3638240B2 (en) |
-
1999
- 1999-12-17 JP JP35991999A patent/JP3638240B2/en not_active Expired - Fee Related
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Publication number | Publication date |
---|---|
JP2000152455A (en) | 2000-05-30 |
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