JP2013013273A - Prefabricated type joint portion for direct-current cv cable - Google Patents

Prefabricated type joint portion for direct-current cv cable Download PDF

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JP2013013273A
JP2013013273A JP2011145280A JP2011145280A JP2013013273A JP 2013013273 A JP2013013273 A JP 2013013273A JP 2011145280 A JP2011145280 A JP 2011145280A JP 2011145280 A JP2011145280 A JP 2011145280A JP 2013013273 A JP2013013273 A JP 2013013273A
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Prior art keywords
cable
stress cone
current
direct
joint portion
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Makoto Maeda
誠 前田
Yasuhiro Sakai
康裕 酒井
Hiroshi Niinobe
洋 新延
Shinichi Goto
伸一 後藤
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Viscas Corp
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Viscas Corp
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Abstract

PROBLEM TO BE SOLVED: To solve the problem that electrical discharges might occur in air spaces S at leading end sides of stress cones in a prefabricated type joint portion for direct-current CV cables and to enhance insulation performance.SOLUTION: In a prefabricated type joint portion for connecting direct-current CV cables provided with an epoxy unit 2 and stress cones 3, leading end portions of the stress cones 3 are composed of conductive moldings 3c. Since ingress of equipotential lines into air spaces S that exist at leading end sides of the stress cones 3 can be suppressed by the conductive moldings 3c, occurrences of electrical discharges in the air spaces S can be suppressed and insulation performance of a connecting portion can be enhanced.

Description

本発明は、エポキシユニットとケーブル絶縁体の間にストレスコーンを設置した直流ＣＶケーブル用プレハブ型接続部に関するものである。   The present invention relates to a prefabricated connection for a DC CV cable in which a stress cone is installed between an epoxy unit and a cable insulator.

図３に従来のＣＶケーブル用プレハブ型接続部を示す（特許文献１）。図において、１、１は接続すべきＣＶケーブル（架橋ポリエチレン絶縁電力ケーブル）、２はエポキシユニット、３、３はストレスコーンである。   FIG. 3 shows a conventional prefabricated connection for a CV cable (Patent Document 1). In the figure, 1 and 1 are CV cables (cross-linked polyethylene insulated power cables) to be connected, 2 is an epoxy unit, and 3 is a stress cone.

ＣＶケーブル１の端部は段剥ぎされて、ケーブル導体１ａ、ケーブル絶縁体１ｂ、外部半導電層１ｃが露出している。ケーブル導体１ａ、１ａは導体接続管４により接続されている。エポキシユニット２はエポキシ樹脂製の補強絶縁体２ａ、埋込電極２ｂ、遮蔽電極２ｃで構成されている。埋込電極２ｂは導体接続管４と接触し、ケーブル導体１ａと同電位となる。ストレスコーン３は絶縁部３ａと導電部３ｂとから構成され、図示しない押圧装置によりエポキシユニット２とケーブル絶縁体１ｂの間に押し込まれる。ストレスコーン導電部３ｂはＣＶケーブル１の外部半導電層１ｃと接触し、接地電位となる。   The end portion of the CV cable 1 is stripped to expose the cable conductor 1a, the cable insulator 1b, and the outer semiconductive layer 1c. The cable conductors 1 a and 1 a are connected by a conductor connecting pipe 4. The epoxy unit 2 includes a reinforcing insulator 2a made of epoxy resin, a buried electrode 2b, and a shielding electrode 2c. The embedded electrode 2b is in contact with the conductor connecting tube 4 and has the same potential as the cable conductor 1a. The stress cone 3 includes an insulating portion 3a and a conductive portion 3b, and is pushed between the epoxy unit 2 and the cable insulator 1b by a pressing device (not shown). The stress cone conductive portion 3b comes into contact with the outer semiconductive layer 1c of the CV cable 1 and becomes a ground potential.

ストレスコーン絶縁部３ａの先端面と埋込電極２ｂの段差部との間にはリング状のストッパー５が設置されている。ストッパー５はストレスコーン絶縁部３ａの先端部が押圧力によって埋込電極２ｂに接近し過ぎないようにするためのものであるが、省略される場合もある。   A ring-shaped stopper 5 is installed between the tip surface of the stress cone insulating portion 3a and the stepped portion of the embedded electrode 2b. The stopper 5 is provided to prevent the tip of the stress cone insulating part 3a from approaching the embedded electrode 2b too much by a pressing force, but may be omitted.

特開２００３−２５９５４２号公報JP 2003-259542 A

図４（Ａ）は図３のプレハブ型接続部に交流課電した場合の等電位線の分布を示す。この場合は、等電位線が全てストレスコーン絶縁部３ａを通過するため特に問題は生じない。ところが、同じプレハブ型接続部に直流課電すると、等電位線の分布は図４（Ｂ）のようになる。すなわち、等電位線が高電圧側へ片寄ってストレスコーン絶縁部３ａの先端側に回り込むようになる。   FIG. 4A shows the distribution of equipotential lines when AC power is applied to the prefabricated connection portion of FIG. In this case, no problem arises because all equipotential lines pass through the stress cone insulating portion 3a. However, when DC is applied to the same prefabricated connection, the distribution of equipotential lines is as shown in FIG. That is, the equipotential line is shifted toward the high voltage side and goes around to the tip side of the stress cone insulating portion 3a.

ストレスコーン絶縁部３ａの先端側にはストッパー５が存在するが、ストッパー５の内周側及び外周側には空気層が存在する（埋込電極２ｂとケーブル導体１ａの間の空気層Ｓとつながっている）ため、等電位線がストレスコーン絶縁部３ａの先端側に回り込むと、空気層で電界集中による放電が生じやすくなり、ケーブル接続部の絶縁性能低下の原因となる。ストレスコーン絶縁部３ａの先端側にストッパー５を設置しない場合も当然のことながら同様の問題が生じる。   The stopper 5 is present at the distal end side of the stress cone insulating portion 3a, but an air layer is present on the inner peripheral side and the outer peripheral side of the stopper 5 (connected to the air layer S between the embedded electrode 2b and the cable conductor 1a). Therefore, if the equipotential line goes around to the tip end side of the stress cone insulating portion 3a, discharge due to electric field concentration is likely to occur in the air layer, which causes a decrease in the insulating performance of the cable connecting portion. Needless to say, the same problem occurs when the stopper 5 is not installed on the distal end side of the stress cone insulating portion 3a.

本発明の目的は、上記のような問題点に鑑み、特に直流ＣＶケーブル用プレハブ型接続部において、ストレスコーン絶縁部の先端側に等電位線が回り込まないようにすることで、ストレスコーン絶縁部の先端側の空気層内で放電が生じるのを抑制し、絶縁性能を向上させることにある。   In view of the above problems, the object of the present invention is to prevent an equipotential line from wrapping around the tip end side of the stress cone insulating portion, particularly in a prefabricated connection portion for a DC CV cable. The purpose of this is to suppress the occurrence of discharge in the air layer on the tip side and improve the insulation performance.

上記目的を達成するため本発明は、直流ＣＶケーブルを接続するエポキシユニット及びストレスコーンを備えたプレハブ型接続部において、前記ストレスコーンの先端部を導電性成形体で構成したことを特徴とするものである。
導電性成形体は、ストレスコーン絶縁部との境目がエポキシユニットの埋込電極の端部より外側に位置するように形成することが好ましい。 In order to achieve the above object, the present invention is characterized in that, in a prefabricated connection portion provided with an epoxy unit for connecting a DC CV cable and a stress cone, the tip end portion of the stress cone is formed of a conductive molded body. It is.
The conductive molded body is preferably formed such that the boundary with the stress cone insulating portion is located outside the end portion of the embedded electrode of the epoxy unit.

本発明によれば、ストレスコーンの先端部を導電性成形体で構成したことにより、ストレスコーンの先端側（高圧側）に存在する空気層に等電位線が入り込むのを抑制できるので、同空気層での放電の発生を抑えることができ、接続部の絶縁性能を高めることができる。   According to the present invention, since the tip portion of the stress cone is formed of a conductive molded body, it is possible to suppress equipotential lines from entering the air layer existing on the tip side (high pressure side) of the stress cone. The occurrence of discharge in the layer can be suppressed, and the insulation performance of the connection portion can be improved.

本発明に係る直流ＣＶケーブル用プレハブ型接続部の一実施例を示す断面図。Sectional drawing which shows one Example of the prefabricated connection part for DC CV cables which concerns on this invention. 図１のプレハブ型接続部に用いるストレスコーンを示す半分切開正面図。The half incision front view which shows the stress cone used for the prefabricated connection part of FIG. 従来のＣＶケーブル用プレハブ型接続部の一例を示す断面図。Sectional drawing which shows an example of the conventional prefabricated connection part for CV cables. 図３のプレハブ型接続部に、（Ａ）は交流課電した場合、（Ｂ）は直流課電した場合の等電位線の分布を示す説明図。FIGS. 4A and 4B are explanatory diagrams showing equipotential line distribution when AC is applied to the prefabricated connection portion of FIG. 3 and FIG.

図１及び図２は本発明の一実施例を示す。この直流ＣＶケーブル用プレハブ型接続部が図３に示した従来のプレハブ型接続部と異なる点は、ストレスコーン３の先端部を導電性成形体３ｃで構成したことである。導電性成形体３ｃは導電部３ｂと同じ導電性ゴムで形成することができる。   1 and 2 show an embodiment of the present invention. This DC CV cable prefabricated connecting portion is different from the conventional prefabricated connecting portion shown in FIG. 3 in that the tip portion of the stress cone 3 is composed of a conductive molded body 3c. The conductive molded body 3c can be formed of the same conductive rubber as that of the conductive portion 3b.

上記のように導電性成形体３ｃを設けておくと、ケーブル導体１ａに直流課電した場合の等電位線は図１のようになり、ストレスコーン３の先端側（高圧側）に存在する空気層Ｓに等電位線が入り込むのを抑制できる。このため、空気層Ｓでの放電の発生を抑えることができ、ケーブル接続部の絶縁性能を高めることができる。   If the conductive molded body 3c is provided as described above, the equipotential line when the direct current is applied to the cable conductor 1a is as shown in FIG. 1, and the air existing on the distal end side (high pressure side) of the stress cone 3 is shown. The equipotential lines can be prevented from entering the layer S. For this reason, generation | occurrence | production of the discharge in the air layer S can be suppressed and the insulation performance of a cable connection part can be improved.

なお、導電性成形体３ｃは、ストレスコーン絶縁部３ａとの境目がエポキシユニット２の埋込電極２ａの端部より外側に位置するように、つまり、導電性成形体３ｃとストレスコーン絶縁部３ａとの境目がエポキシユニット２の埋込電極２ａの端部から若干の距離Ｄだけ離れるように、形成することはが好ましい。このようにすると、等電位線がストレスコーン３の先端側の空気層に入り込むのをより確実に防止することができる。   The conductive molded body 3c is arranged so that the boundary with the stress cone insulating portion 3a is located outside the end of the embedded electrode 2a of the epoxy unit 2, that is, the conductive molded body 3c and the stress cone insulating portion 3a. It is preferable to form such that the boundary between is separated from the end of the embedded electrode 2a of the epoxy unit 2 by a slight distance D. In this way, it is possible to more reliably prevent the equipotential lines from entering the air layer on the tip side of the stress cone 3.

１：ＣＶケーブル
１ａ：ケーブル導体
１ｂ：ケーブル絶縁体
１ｃ：外部半導電層
２：エポキシユニット
２ａ：補強絶縁体
２ｂ：埋込電極
２ｃ：遮蔽電極
３：ストレスコーン
３ａ：絶縁部
３ｂ：導電部
３ｃ：導電性成形体
４：導体接続管
５：ストッパー
Ｓ：空気層 1: CV cable 1a: cable conductor 1b: cable insulator 1c: outer semiconductive layer 2: epoxy unit 2a: reinforcing insulator 2b: buried electrode 2c: shielding electrode 3: stress cone 3a: insulating part 3b: conductive part 3c : Conductive molded body 4: Conductor connecting pipe 5: Stopper S: Air layer

Claims (2)

直流ＣＶケーブルを接続するエポキシユニット及びストレスコーンを備えたプレハブ型接続部において、前記ストレスコーンの先端部を導電性成形体で構成したことを特徴とする直流ＣＶケーブル用プレハブ型接続部。   A prefabricated connection portion for a DC CV cable, characterized in that, in a prefabricated connection portion provided with an epoxy unit and a stress cone for connecting a DC CV cable, the tip end portion of the stress cone is formed of a conductive molded body. 導電性成形体とストレスコーンの絶縁部との境目がエポキシユニットの埋込電極の端部より外側に位置することを特徴とする請求項１記載の直流ＣＶケーブル用プレハブ型接続部。   2. The prefabricated connection portion for a DC CV cable according to claim 1, wherein the boundary between the conductive molded body and the insulating portion of the stress cone is located outside the end portion of the embedded electrode of the epoxy unit.
JP2011145280A 2011-06-30 2011-06-30 Prefabricated type joint portion for direct-current cv cable Pending JP2013013273A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111145946A (en) * 2019-12-18 2020-05-12 全球能源互联网研究院有限公司 Cable insulation device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0523742U (en) * 1991-08-30 1993-03-26 株式会社フジクラ Prefabricated intermediate connection of CV cable

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0523742U (en) * 1991-08-30 1993-03-26 株式会社フジクラ Prefabricated intermediate connection of CV cable

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111145946A (en) * 2019-12-18 2020-05-12 全球能源互联网研究院有限公司 Cable insulation device
CN111145946B (en) * 2019-12-18 2021-06-18 全球能源互联网研究院有限公司 Cable insulation device

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