JP2005328610A - Cable termination - Google Patents

Cable termination Download PDF

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JP2005328610A
JP2005328610A JP2004143356A JP2004143356A JP2005328610A JP 2005328610 A JP2005328610 A JP 2005328610A JP 2004143356 A JP2004143356 A JP 2004143356A JP 2004143356 A JP2004143356 A JP 2004143356A JP 2005328610 A JP2005328610 A JP 2005328610A
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cable
layer
outer periphery
electric field
field relaxation
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JP4495514B2 (en
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Hitoshi Niidate
均 新舘
Nobuyuki Sema
信幸 瀬間
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SWCC Corp
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Showa Electric Wire and Cable Co
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Abstract

<P>PROBLEM TO BE SOLVED: To easily form the end of a power cable of 110 kV class or over. <P>SOLUTION: This cable end is formed with a semiconductive layer 12 outside a cable which is exposed by peeling the terminal of a CV cable 1 of 110 kV class. A stress cone 3 composed of a rubber-form elastic material is mounted around the exposed semiconductor layer 12 outside the cable. Moreover, the cable end is formed with a field relaxing layer 4 up to the top end of the cable insulating layer 12 from the bottom end of the stress cone 3 at the periphery of the stress cone 3 and the periphery of the cable insulating layer 12. The field relaxing layer 4 is formed of a material where an elastomer material is charged with a zinc oxide (ZnO) or silicon carbide(SiO) or the like. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ケーブル終端部に係り、特に、超高圧電力ケーブルのケーブル終端部を簡易に形成する場合に有用なケーブル終端部に関する。   The present invention relates to a cable terminal portion, and more particularly to a cable terminal portion that is useful when a cable terminal portion of an ultra-high voltage power cable is simply formed.

従来から、２２〜３３ｋＶ級の電力ケーブルのケーブル終端部として、図６に示すように、ケーブルの端末を段剥して露出させたケーブル外部半導電層１０の外周にケーブル絶縁層２０の外周に跨って酸化亜鉛（ＺｎＯ）を有する層（以下「ＺｎＯ層」という。）３０を設けて成るものが知られている（例えば、特許文献１参照）。   Conventionally, as shown in FIG. 6, as a cable terminal portion of a 22 to 33 kV class power cable, the outer end of the cable outer semiconductive layer 10 exposed by stripping the end of the cable straddles the outer periphery of the cable insulating layer 20. A layer having a layer 30 containing zinc oxide (ZnO) (hereinafter referred to as “ZnO layer”) is known (see, for example, Patent Document 1).

このようなケーブル終端部によれば、電力ケーブルのケーブル外部半導電層１０およびケーブル絶縁層２０の外周にＺｎＯ層３０を設けるのみで、簡易な構成のケーブル終端部を形成することができる。   According to such a cable termination portion, a cable termination portion having a simple configuration can be formed only by providing the ZnO layer 30 on the outer periphery of the cable outer semiconductive layer 10 and the cable insulation layer 20 of the power cable.

特表２０００−５０３４５４号公報JP 2000-503454 Gazette

しかしながら、このような構成のケーブル終端部を１１０ｋＶ級以上の電力ケーブルのケーブル終端部に適用すると、電界の集中する部分で、すなわちケーブル外部半導電層の先端部分で発熱し電力ケーブルの電気特性を低下させる虞があった。
ここで、上記の発熱現象は、ＺｎＯ層３０の電圧―電流特性に起因するものと解される。すなわち、図７に示すように、ＺｎＯ層３０の電圧―電流特性は非線形で２２〜３３ｋＶ程度の電圧（図中Ａ）では殆ど電流が流れないものの、電圧が１１０ｋＶ（図中Ｂ）を越えるとＺｎＯ層３０に大電流が流れ、この電流により電界が集中する部分（ケーブル外部半導電層の先端部分）に発熱が生じるものと解される。
本発明は、ＺｎＯ層等の電界緩和層とストレスコーンとの組み合わせにより、１１０ｋＶ級以上の電力ケーブルであっても、簡易構造のケーブル終端部を形成することができるケーブル終端部を提供することを目的としている。 However, when the cable termination having such a configuration is applied to the cable termination of a 110 kV class or higher power cable, heat is generated at the portion where the electric field is concentrated, that is, at the tip of the external semiconductive layer of the cable, and the electrical characteristics of the power cable are reduced. There was a risk of lowering.
Here, it is understood that the above heat generation phenomenon is caused by the voltage-current characteristics of the ZnO layer 30. That is, as shown in FIG. 7, the voltage-current characteristic of the ZnO layer 30 is non-linear and almost no current flows at a voltage of about 22 to 33 kV (A in the figure), but when the voltage exceeds 110 kV (B in the figure). It is understood that a large current flows through the ZnO layer 30 and heat is generated at the portion where the electric field is concentrated (the tip portion of the cable external semiconductive layer).
The present invention provides a cable termination portion that can form a cable termination portion having a simple structure even with a power cable of 110 kV class or higher by combining an electric field relaxation layer such as a ZnO layer and a stress cone. It is aimed.

本発明の第１の態様であるケーブル終端部は、ケーブルの端末を段剥してケーブル絶縁層およびケ−ブル外部半導電層を露出させたケーブル端末部と、ケ−ブル外部半導電層の先端部外周に装着されたストレスコーンと、ストレスコーンの外周にケーブル絶縁層の外周に跨って設けられた電界緩和層とを備えるものである。
本発明の第２の態様であるケーブル終端部は、ケーブルの端末を段剥してケーブル絶縁層およびケーブル外部半導電層を露出させたケーブル端末部と、ケーブル外部半導電層の先端部外周に装着されたストレスコーンと、ストレスコーンの絶縁部側に連設されケーブル絶縁層の外周に装着された円筒状の第１の補助絶縁層と、ストレスコーンの外周に第１の補助絶縁層の外周に跨って設けられた電界緩和層とを備えるものである。 The cable termination portion according to the first aspect of the present invention includes a cable terminal portion in which a cable end is stepped off to expose a cable insulating layer and a cable outer semiconductive layer, and a tip of the cable outer semiconductive layer. A stress cone mounted on the outer periphery of the part, and an electric field relaxation layer provided on the outer periphery of the stress cone across the outer periphery of the cable insulating layer.
The cable termination portion according to the second aspect of the present invention is attached to the cable end portion where the cable end is stepped off to expose the cable insulating layer and the cable outer semiconductive layer, and to the outer periphery of the tip end portion of the cable outer semiconductive layer. A stressed cone, a cylindrical first auxiliary insulating layer continuously provided on the insulating portion of the stress cone and attached to the outer periphery of the cable insulating layer, and an outer periphery of the first auxiliary insulating layer on the outer periphery of the stress cone. And an electric field relaxation layer provided across.

本発明の第３の態様であるケーブル終端部は、ケーブルの端末を段剥してケーブル絶縁層およびケーブル外部半導電層を露出させたケーブル端末部と、ケーブル外部半導電層の先端部外周に装着されたストレスコーンと、ストレスコーンの外周にケーブル絶縁層の外周に跨って設けられた電界緩和層と、ケーブル絶縁層上の電界緩和層の外周に装着された円筒状の第２の補助絶縁層とを備えるものである。   The cable termination portion according to the third aspect of the present invention is attached to the cable end portion where the cable end is stepped off to expose the cable insulating layer and the cable outer semiconductive layer, and to the outer periphery of the tip end portion of the cable outer semiconductive layer. The stress cone, the electric field relaxation layer provided on the outer periphery of the stress insulation cone over the outer periphery of the cable insulation layer, and the cylindrical second auxiliary insulation layer mounted on the outer periphery of the electric field relaxation layer on the cable insulation layer Are provided.

本発明の第４の態様は、第１の態様乃至第３の態様の何れかのケーブル終端部において、電界緩和層の外周にケーブル端末部の全体を覆うように絶縁ブッシングが配設されているものである。   According to a fourth aspect of the present invention, in the cable termination portion of any one of the first to third aspects, an insulating bushing is disposed on the outer periphery of the electric field relaxation layer so as to cover the entire cable terminal portion. Is.

本発明の第５の態様は、第４の態様であるケーブル終端部において、絶縁ブッシングの外周に複数個の襞部が長手方向に沿って離間して突設されているものである。   According to a fifth aspect of the present invention, in the cable terminal portion according to the fourth aspect, a plurality of flanges are provided on the outer periphery of the insulating bushing so as to project apart from each other along the longitudinal direction.

本発明の第６の態様は、第１の態様乃至第３の態様の何れかのケーブル終端部において、ケーブル絶縁層上の電界緩和層の外周または第１の補助絶縁層上の電界緩和層の外周に、複数個の襞部が長手方向に沿って離間して突設されているものである。   According to a sixth aspect of the present invention, in the cable termination portion according to any one of the first to third aspects, the outer periphery of the electric field relaxation layer on the cable insulating layer or the electric field relaxation layer on the first auxiliary insulating layer. A plurality of flanges are provided on the outer periphery so as to protrude apart from each other in the longitudinal direction.

本発明の第７の態様は、第１の態様乃至第６の態様の何れかのケーブル終端部において、電界緩和層は、エラストマー材料に酸化亜鉛またはシリコンカーバイトを充填したもので形成されているものである。   According to a seventh aspect of the present invention, in the cable termination portion according to any one of the first to sixth aspects, the electric field relaxation layer is formed of an elastomer material filled with zinc oxide or silicon carbide. Is.

本発明の第８の態様は、第１の態様乃至第７の態様の何れかのケーブル終端部において、電界緩和層は、ケーブル絶縁層の外周または第１の補助絶縁層の外周からストレスコーンの半導電部の頂部外周に跨って設けられているものである。   According to an eighth aspect of the present invention, in the cable termination portion according to any one of the first to seventh aspects, the electric field relaxation layer is formed from the outer periphery of the cable insulating layer or the outer periphery of the first auxiliary insulating layer. It is provided across the outer periphery of the top of the semiconductive portion.

本発明の第１の態様乃至第８の態様のケーブル終端部によれば、ケ−ブル外部半導電層の先端部外周にストレスコーンが装着されていることから、ケ−ブル外部半導電層の先端部における電界の集中を緩和することができ、ひいては、当該ケ−ブル外部半導電層の先端部における発熱の発生を防止することができ、またストレスコーンの外周にケーブル絶縁層の外周に跨って電界緩和層が設けられていることから、簡易構造のケーブル終端部を形成することができる。従って、本発明のケーブル終端部によれば、１１０ｋＶ級以上の電力ケーブルであっても、簡易構造のケーブル終端部を形成することができる。   According to the cable termination portion of the first to eighth aspects of the present invention, since the stress cone is mounted on the outer periphery of the tip end portion of the cable outer semiconductive layer, The concentration of the electric field at the tip can be alleviated, and as a result, generation of heat at the tip of the cable outer semiconductive layer can be prevented, and the outer periphery of the cable insulation layer can be straddled on the outer periphery of the stress cone. Since the electric field relaxation layer is provided, a cable termination portion having a simple structure can be formed. Therefore, according to the cable termination portion of the present invention, a cable termination portion having a simple structure can be formed even with a power cable of 110 kV class or higher.

以下、本発明のケーブル終端部を適用した実施の形態例について、図面を参照して説明する。
［実施例１］
図１は、本発明の第１の実施例におけるケーブル終端部の概略断面図を示している。 Embodiments to which the cable termination portion of the present invention is applied will be described below with reference to the drawings.
[Example 1]
FIG. 1 shows a schematic cross-sectional view of a cable end portion in the first embodiment of the present invention.

同図において、本発明のケーブル終端部は、１１０ｋＶ級の架橋ポリエチレン絶縁ポリ塩化ビニルシースケーブル（以下「ＣＶケーブル」という。）等のケーブル１の端末を段剥することによって、ケーブル導体１１、ケーブル絶縁層１２、ケーブル外部半導電層１３およびケーブル遮蔽層（不図示）がそれぞれ露出されている。   In the figure, the cable terminal portion of the present invention is formed by stripping the end of a cable 1 such as a 110 kV-class crosslinked polyethylene insulated polyvinyl chloride sheathed cable (hereinafter referred to as “CV cable”), thereby providing a cable conductor 11 and a cable insulation. The layer 12, the cable outer semiconductive layer 13, and the cable shielding layer (not shown) are respectively exposed.

このようなケーブル端末部のケーブル導体１１の上端部には導体接続子２が接続され、ケーブル外部半導電層１２の外周にはゴム状弾性材料から成るストレスコーン３が装着されている。   A conductor connector 2 is connected to the upper end portion of the cable conductor 11 of such a cable end portion, and a stress cone 3 made of a rubber-like elastic material is attached to the outer periphery of the cable outer semiconductive layer 12.

ストレスコーン３は、半導電のゴム状弾性材料から成る半導電部３１と、絶縁性のゴム状弾性材料から成り、半導電部３１の先端部側に一体的に設けられる絶縁部３２とを備えている。ここで、ゴム状弾性材料としては常温収縮特性の良好なシリコンゴムを用いることが好ましいが、絶縁特性の良好なＥＰゴム等を用いてもよい。   The stress cone 3 includes a semiconductive portion 31 made of a semiconductive rubber-like elastic material and an insulating portion 32 made of an insulating rubber-like elastic material and provided integrally on the tip end side of the semiconductive portion 31. ing. Here, as the rubber-like elastic material, it is preferable to use silicon rubber having a normal temperature shrinkage property, but EP rubber having a good insulation property may be used.

半導電部３１は、ケーブル外部半導電層１３の先端部近傍の外周に装着される半導電性の円筒状部３１ａと、円筒状部３１ａの先端部側に連設されケーブル外部半導電層１３の先端部外周にそれ自身の先端部をケーブル１の端末側に向けて装着されるベルマウス部３１ｂとを備えている。   The semiconductive portion 31 is provided on the outer periphery in the vicinity of the distal end portion of the cable external semiconductive layer 13, and the semiconductive portion 31 a is connected to the distal end side of the cylindrical portion 31 a and is connected to the cable external semiconductive layer 13. And a bell mouth portion 31b attached to the outer periphery of the distal end of the cable 1 with its own distal end facing the terminal side of the cable 1.

絶縁部３２は、ベルマウス部３１ｂの外周を覆う絶縁性のスカート状部３２ａと、スカート状部３２ａの先端部側に連設されケーブル１の端末側に向けて漸次縮径するテーパ部３２ｂとを備えている。   The insulating portion 32 includes an insulating skirt-like portion 32a that covers the outer periphery of the bell mouth portion 31b, and a tapered portion 32b that is connected to the distal end portion side of the skirt-like portion 32a and gradually decreases in diameter toward the terminal side of the cable 1. It has.

このような構成のストレスコーン３は、ベルマウス部３１ｂがケーブル外部半導電層１３の先端部外周に位置するようにして、すなわち、ベルマウス部３１ｂの内周部の立ち上がり部分３１ｃがケーブル外部半導電層１３の先端部外周と電気的に接触するようにして装着される。   The stress cone 3 having such a configuration is such that the bell mouth portion 31b is positioned on the outer periphery of the tip end portion of the cable outer semiconductive layer 13, that is, the rising portion 31c of the inner peripheral portion of the bell mouth portion 31b is the cable outer half portion. The conductive layer 13 is mounted so as to be in electrical contact with the outer periphery of the tip portion.

次に、このようにしてケーブル外部半導電層１３の先端部外周に装着されたストレスコーン３の外周およびケーブル絶縁層１２の外周には、ストレスコーン３の下端位置からケーブル絶縁層１２の上端位置に跨って電界緩和層４が設けられている。   Next, on the outer periphery of the stress cone 3 and the outer periphery of the cable insulating layer 12 mounted on the outer periphery of the distal end portion of the cable outer semiconductive layer 13 in this way, the lower end position of the stress cone 3 and the upper end position of the cable insulating layer 12 are provided. The electric field relaxation layer 4 is provided so as to extend over.

電界緩和層４は、例えば電界緩和チューブや電界緩和テープを巻回したものなどから成り、その厚さは例えば１〜２ｍｍ程度とされている。ここで、電界緩和層４は、エラストマー材料に酸化亜鉛（ＺｎＯ）やシリコンカーバイト（ＳｉＯ）を充填したものなどで形成されている。   The electric field relaxation layer 4 is made of, for example, a wound electric field relaxation tube or an electric field relaxation tape, and has a thickness of about 1 to 2 mm, for example. Here, the electric field relaxation layer 4 is formed of an elastomer material filled with zinc oxide (ZnO) or silicon carbide (SiO).

なお、電界緩和層４は図示のようにケーブル絶縁層１２の上端までをほぼ覆う形の他、電界の集中する付近に部分的に設けてもよい。   The electric field relaxation layer 4 may be partially provided in the vicinity of the concentration of the electric field in addition to substantially covering the upper end of the cable insulating layer 12 as shown in the figure.

このような構成のケーブル終端部によれば、ケ−ブル外部半導電層１３の先端部外周にストレスコーン３が装着されていることから、ケ−ブル外部半導電層１３の先端部における電界の集中を緩和することができ、ひいては、当該ケ−ブル外部半導電層１３の先端部における発熱の発生を防止することができ、またストレスコーン３の外周にケーブル絶縁層１２の外周に跨って電界緩和層４が設けられていることから、簡易構造のケーブル終端部を形成することができる。従って、第１の実施例におけるケーブル終端部によれば、１１０ｋＶ級以上の電力ケーブルであっても、簡易構造のケーブル終端部を形成することができる。
［実施例２］
図２は、本発明の第２の実施例におけるケーブル終端部の概略断面図を示している。なお、同図において、図１と共通する部分には同一の符号を付して詳細な説明を省略する。 According to the cable terminal portion having such a configuration, since the stress cone 3 is attached to the outer periphery of the distal end portion of the cable outer semiconductive layer 13, the electric field at the distal end portion of the cable outer semiconductive layer 13 is reduced. Concentration can be mitigated, and as a result, generation of heat at the tip of the cable outer semiconductive layer 13 can be prevented, and an electric field extends over the outer periphery of the cable insulating layer 12 on the outer periphery of the stress cone 3. Since the relaxing layer 4 is provided, a cable termination portion having a simple structure can be formed. Therefore, according to the cable termination part in the first embodiment, a cable termination part having a simple structure can be formed even with a power cable of 110 kV class or higher.
[Example 2]
FIG. 2 shows a schematic cross-sectional view of the cable end portion in the second embodiment of the present invention. In the figure, parts common to those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted.

図２において、この実施例においては、ストレスコーン３の絶縁部３２がベルマウス部３１ｂの外周を覆う絶縁性のスカート状部３２ａと、ケーブル絶縁層１２の外周に装着されるゴム状弾性絶縁材料から成る円筒状の第１の補助絶縁層３２ｃとで構成され、両者はストレスコーン３の絶縁部３２として一体的に形成されている。   2, in this embodiment, the insulating part 32 of the stress cone 3 has an insulating skirt-like part 32a covering the outer periphery of the bell mouth part 31b, and a rubber-like elastic insulating material attached to the outer periphery of the cable insulating layer 12. The cylindrical first auxiliary insulating layer 32 c is formed as an insulating part 32 of the stress cone 3.

第１の補助絶縁層３２ｃの外径はスカート状部３２ａの外径と略同等とされ、この第１の補助絶縁層３２ｃの外周にはストレスコーン３の外周に跨って電界緩和層４が設けられている。   The outer diameter of the first auxiliary insulating layer 32c is substantially equal to the outer diameter of the skirt-shaped portion 32a, and the electric field relaxation layer 4 is provided on the outer periphery of the first auxiliary insulating layer 32c across the outer periphery of the stress cone 3. It has been.

なお、電界緩和層４は図示のように第１の補助絶縁層３２ｃの上端までをほぼ覆う形の他、電界の集中する付近に部分的に設けてもよい。   The electric field relaxation layer 4 may be partially provided in the vicinity of the concentration of the electric field in addition to substantially covering the upper end of the first auxiliary insulating layer 32c as shown in the figure.

この実施例においては、ストレスコーン３が一様な厚さの略円筒状体で形成されていることから、第１の実施例に比し、ケ−ブル外部半導電層１３およびケーブル絶縁層１２に対するストレスコーン３の装着を容易に行うことができる。また、第１の実施例ではストレスコーン３の先端部分においてケーブル絶縁層１２と電界緩和層４との間にギャップが生じる心配もあり得るが、この実施例ではそのような心配はなく、ケーブル終端部の電気特性を向上させることができる。
［実施例３］
図３は、本発明の第３の実施例におけるケーブル終端部の概略断面図を示している。なお、同図において、図１と共通する部分には同一の符号を付して詳細な説明を省略する。 In this embodiment, since the stress cone 3 is formed of a substantially cylindrical body having a uniform thickness, the cable outer semiconductive layer 13 and the cable insulating layer 12 are compared with the first embodiment. It is possible to easily attach the stress cone 3 to the. In the first embodiment, there may be a concern that a gap is generated between the cable insulating layer 12 and the electric field relaxation layer 4 at the tip portion of the stress cone 3. However, in this embodiment, there is no such concern. The electrical characteristics of the part can be improved.
[Example 3]
FIG. 3 shows a schematic cross-sectional view of the cable end portion in the third embodiment of the present invention. In the figure, parts common to those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted.

図３において、この実施例においては、図１に示すケーブル絶縁層１２上の電界緩和層４の外周に、絶縁部３２のスカート状部３２ａの外径と略同等の外径を有するゴム状弾性絶縁材料から成る円筒状の第２の補助絶縁層３２ｄが装着されている。   3, in this embodiment, a rubber-like elastic material having an outer diameter substantially equal to the outer diameter of the skirt-like portion 32a of the insulating portion 32 on the outer periphery of the electric field relaxation layer 4 on the cable insulating layer 12 shown in FIG. A cylindrical second auxiliary insulating layer 32d made of an insulating material is mounted.

この実施例においては、ケーブル絶縁層１２上の電界緩和層４の外周に第２の補助絶縁層３２ｄが存在することから、第１の実施例に比し、電界緩和層４の外表面の電界をより一層緩和させることができる。
［実施例４］
図４は、本発明の第４の実施例におけるケーブル終端部の概略断面図を示している。なお、同図において、図２と共通する部分には同一の符号を付して詳細な説明を省略する。 In this embodiment, since the second auxiliary insulating layer 32d exists on the outer periphery of the electric field relaxation layer 4 on the cable insulating layer 12, the electric field on the outer surface of the electric field relaxation layer 4 is larger than that of the first embodiment. Can be further relaxed.
[Example 4]
FIG. 4 shows a schematic cross-sectional view of the cable end portion in the fourth embodiment of the present invention. In the figure, parts common to those in FIG. 2 are denoted by the same reference numerals and detailed description thereof is omitted.

図４において、この実施例においては、図２に示す電界緩和層４の外周に、ケーブル端末部の全体を覆うように絶縁ブッシング５が配設されている。   4, in this embodiment, an insulating bushing 5 is provided on the outer periphery of the electric field relaxation layer 4 shown in FIG. 2 so as to cover the entire cable terminal portion.

絶縁ブッシング５は、図１に示す電界緩和層４の外周に、ケーブル端末部と同心状に配設された絶縁筒５１と、絶縁筒５１の上下にそれぞれ絶縁筒５１の開口部を閉塞するように配設された上板５２、底板５３と、絶縁筒５１の外周に長手方向に沿って離間して突設された複数個の襞部５４とを備えている。   The insulating bushing 5 has an insulating cylinder 51 arranged concentrically with the cable terminal portion on the outer periphery of the electric field relaxation layer 4 shown in FIG. 1 and an opening of the insulating cylinder 51 above and below the insulating cylinder 51. The upper plate 52 and the bottom plate 53 are provided on the outer periphery of the insulating cylinder 51, and a plurality of flanges 54 are provided on the outer periphery of the insulating cylinder 51 so as to protrude apart from each other in the longitudinal direction.

ここで、上記の絶縁筒５１および襞部５４は、次のようなもので形成されている。先ず、絶縁筒５１は機械的強度の高い材料、例えばエポキシ樹脂やＦＲＰ等の硬質プラスチック樹脂で形成され、その内径はストレスコーン３の外周に設けられた電界緩和層４の外径と同等若しくはそれより若干大径とされ、また軸方向の長さはストレスコーン３の下端位置から後述する導体接続子２の略中間部に至る長さとされている。   Here, the insulating cylinder 51 and the flange portion 54 are formed as follows. First, the insulating cylinder 51 is formed of a material having high mechanical strength, for example, a hard plastic resin such as epoxy resin or FRP, and the inner diameter thereof is equal to or equal to the outer diameter of the electric field relaxation layer 4 provided on the outer periphery of the stress cone 3. The diameter is slightly larger, and the length in the axial direction is a length from the lower end position of the stress cone 3 to a substantially intermediate portion of the conductor connector 2 described later.

次に、襞部５４は電気絶縁性に優れた材料、例えばシリコンポリマーなどの高分子絶縁材料で略円盤状に形成され、絶縁筒５１の外周に被着された円筒状のポリマー被覆体５４ａの外周に径方向外方に突出するように連設されている。   Next, the flange portion 54 is formed in a substantially disc shape with a material having excellent electrical insulation, for example, a polymer insulating material such as silicon polymer, and the cylindrical polymer covering 54a attached to the outer periphery of the insulating cylinder 51. It is connected to the outer periphery so as to protrude radially outward.

一方、ケーブル導体１１の上端部には導体接続子２が取り付けられており、この導体接続子２の上端部は上板５２の中央部に設けられた貫通孔５２ａから気密に突設されている。また、底板５３の中央部に設けた貫通孔５３ａの周縁部には下方に向かうフランジ５３ｂが設けられており、このフランジ５３ｂとケーブル１のケーブルシース１４間には保護テープの巻回層６ａが設けられている。   On the other hand, a conductor connector 2 is attached to the upper end portion of the cable conductor 11, and the upper end portion of the conductor connector 2 protrudes in an airtight manner from a through hole 52 a provided in the center portion of the upper plate 52. . Further, a flange 53b directed downward is provided at the peripheral edge portion of the through hole 53a provided in the center portion of the bottom plate 53, and a winding layer 6a of the protective tape is provided between the flange 53b and the cable sheath 14 of the cable 1. Is provided.

なお、図中、６ｂは保護テープ巻回層、６ｃはシール部、１５はケーブル遮蔽層を示している。   In the figure, 6b represents a protective tape winding layer, 6c represents a seal portion, and 15 represents a cable shielding layer.

この実施例においては、ケーブル端末部の全体が絶縁ブッシング５で包被されていることから、第１の実施例に比し、耐候性を向上させることができ、また、絶縁筒５１の外周に襞部５４が設けられていることから、雷インパルス耐電圧特性を向上させることができる。   In this embodiment, since the entire cable terminal portion is covered with the insulating bushing 5, weather resistance can be improved as compared with the first embodiment, and the outer periphery of the insulating cylinder 51 can be improved. Since the collar portion 54 is provided, the lightning impulse withstand voltage characteristic can be improved.

ここで、第４の実施例においては、図２に示すケーブル終端部を絶縁ブッシング５で包被した場合について述べているが、図１または図３に示すケーブル終端部の全体を前述と同様に絶縁ブッシング５で包被するようにしてもよい。
［実施例５］
図５は、本発明の第５の実施例におけるケーブル終端部の概略断面図を示している。なお、同図において、図２および図４と共通する部分には同一の符号を付して詳細な説明を省略する。 Here, in the fourth embodiment, the case where the cable end portion shown in FIG. 2 is covered with the insulating bushing 5 is described. However, the entire cable end portion shown in FIG. 1 or FIG. It may be covered with an insulating bushing 5.
[Example 5]
FIG. 5 shows a schematic cross-sectional view of the cable end portion in the fifth embodiment of the present invention. In the figure, the same reference numerals are given to the same parts as those in FIGS. 2 and 4 and the detailed description is omitted.

図５において、この実施例においては、図２に示す電界緩和層４の外周に、図５に示すものと同様の襞部５４が設けられている。   5, in this embodiment, a flange 54 similar to that shown in FIG. 5 is provided on the outer periphery of the electric field relaxation layer 4 shown in FIG.

ここで、襞部５４は、図５に示すものと同様に、電界緩和層４の外周に被着された円筒状のポリマー被覆体５４ｂの外周に径方向外方に突出するように連設されている。   Here, like the one shown in FIG. 5, the flange portion 54 is continuously provided so as to protrude radially outward on the outer periphery of the cylindrical polymer coating 54 b attached to the outer periphery of the electric field relaxation layer 4. ing.

この実施例においては、電界緩和層４の外周に襞部５４が設けられていることから、第１の実施例に比し、雷インパルス耐電圧特性を向上させることができる。   In this embodiment, since the flange portion 54 is provided on the outer periphery of the electric field relaxation layer 4, the lightning impulse withstand voltage characteristic can be improved as compared with the first embodiment.

ここで、第５の実施例においては、図２に示す電界緩和層４の外周に襞部５４を設けた場合について述べているが、図１に示すケ−ブル絶縁層１２上の電界緩和層４の外周、または図３に示す第２の補助絶縁層３２ｄ上の外周に襞部５４を設けてもよい。   Here, in the fifth embodiment, the case where the flange portion 54 is provided on the outer periphery of the electric field relaxation layer 4 shown in FIG. 2 is described. However, the electric field relaxation layer on the cable insulating layer 12 shown in FIG. 4 or an outer periphery on the second auxiliary insulating layer 32d shown in FIG.

前述の実施例においては、１１０ｋＶ級のＣＶケーブルのケーブル終端部について述べているが、２２ｋＶ級もしくは３３ｋＶ級のＣＶケーブルのケーブル終端部に適用してもよい。   In the above-described embodiment, the cable termination portion of the 110 kV class CV cable is described. However, the present invention may be applied to a cable termination portion of a 22 kV class or 33 kV class CV cable.

本発明の第１の実施例におけるケーブル終端部の概略断面図。The schematic sectional drawing of the cable termination | terminus part in 1st Example of this invention. 本発明の第２の実施例におけるケーブル終端部の概略断面図。The schematic sectional drawing of the cable terminal part in the 2nd Example of this invention. 本発明の第３の実施例におけるケーブル終端部の概略断面図。The schematic sectional drawing of the cable termination | terminus part in the 3rd Example of this invention. 本発明の第４の実施例におけるケーブル終端部の概略断面図。The schematic sectional drawing of the cable termination | terminus part in the 4th Example of this invention. 本発明の第５の実施例におけるケーブル終端部の概略断面図。The schematic sectional drawing of the cable termination | terminus part in the 5th Example of this invention. 従来のケーブル終端部の概略断面図。The schematic sectional drawing of the conventional cable termination part. ＺｎＯ層の電圧−電流特性を示す説明図。Explanatory drawing which shows the voltage-current characteristic of a ZnO layer.

符号の説明Explanation of symbols

１・・・ケーブル
１２・・・ケーブル絶縁層
１３・・・外部半導電層
３・・・ストレスコーン
３２ｃ・・・第１の補助絶縁層
３２ｄ・・・第２の補助絶縁層
４・・・電界緩和層
５・・・絶縁ブッシング
５４・・・襞部
1 ... Cable
DESCRIPTION OF SYMBOLS 12 ... Cable insulation layer 13 ... External semiconductive layer 3 ... Stress cone 32c ... 1st auxiliary insulation layer 32d ... 2nd auxiliary insulation layer 4 ... Electric field relaxation layer 5. ..Insulating bushings 54 ... buttocks

Claims (8)

ケーブルの端末を段剥してケーブル絶縁層およびケ−ブル外部半導電層を露出させたケーブル端末部と、前記ケ−ブル外部半導電層の先端部外周に装着されたストレスコーンと、前記ストレスコーンの外周に前記ケーブル絶縁層の外周に跨って設けられた電界緩和層とを備えることを特徴とするケーブル終端部。   A cable end portion in which a cable end is stripped to expose a cable insulating layer and a cable outer semiconductive layer; a stress cone attached to an outer periphery of a tip end of the cable outer semiconductive layer; and the stress cone And an electric field relaxation layer provided across the outer periphery of the cable insulation layer. ケーブルの端末を段剥してケーブル絶縁層およびケーブル外部半導電層を露出させたケーブル端末部と、前記ケーブル外部半導電層の先端部外周に装着されたストレスコーンと、前記ストレスコーンの絶縁部側に連設され前記ケーブル絶縁層の外周に装着された円筒状の第１の補助絶縁層と、前記ストレスコーンの外周に前記第１の補助絶縁層の外周に跨って設けられた電界緩和層とを備えることを特徴とするケーブル終端部。   A cable end portion in which a cable end is stepped off to expose a cable insulating layer and a cable outer semiconductive layer; a stress cone attached to the outer periphery of a distal end portion of the cable outer semiconductive layer; and an insulating portion side of the stress cone A cylindrical first auxiliary insulating layer that is connected to the outer periphery of the cable insulating layer and an electric field relaxation layer that is provided on the outer periphery of the stress cone across the outer periphery of the first auxiliary insulating layer. A cable end section comprising: ケーブルの端末を段剥してケーブル絶縁層およびケーブル外部半導電層を露出させたケーブル端末部と、前記ケーブル外部半導電層の先端部外周に装着されたストレスコーンと、前記ストレスコーンの外周に前記ケーブル絶縁層の外周に跨って設けられた電界緩和層と、前記ケーブル絶縁層上の前記電界緩和層の外周に装着された円筒状の第２の補助絶縁層とを備えることを特徴とするケーブル終端部。   A cable end portion in which a cable end is stepped off to expose a cable insulating layer and a cable external semiconductive layer, a stress cone attached to an outer periphery of a tip end portion of the cable external semiconductive layer, and an outer periphery of the stress cone A cable comprising: an electric field relaxation layer provided across the outer periphery of the cable insulation layer; and a cylindrical second auxiliary insulation layer mounted on the outer periphery of the electric field relaxation layer on the cable insulation layer. Terminal part. 前記電界緩和層の外周に前記ケーブル端末部の全体を覆うように絶縁ブッシングが配設されていることを特徴とする請求項１乃至請求項３の何れか１項記載のケーブル終端部。   The cable termination part according to any one of claims 1 to 3, wherein an insulating bushing is disposed on the outer periphery of the electric field relaxation layer so as to cover the entire cable terminal part. 前記絶縁ブッシングの外周に複数個の襞部が長手方向に沿って離間して突設されていることを特徴とする請求項４記載のケーブル終端部。   The cable terminal portion according to claim 4, wherein a plurality of flanges protrude from the outer periphery of the insulating bushing along the longitudinal direction. 前記ケーブル絶縁層上の前記電界緩和層の外周または前記第１の補助絶縁層上の前記電界緩和層の外周に、複数個の襞部が長手方向に沿って離間して突設されていることを特徴とする請求項１乃至請求項３の何れか１項記載のケーブル終端部。   A plurality of eaves portions project from the outer periphery of the electric field relaxation layer on the cable insulating layer or the outer periphery of the electric field relaxation layer on the first auxiliary insulating layer so as to be spaced apart in the longitudinal direction. The cable terminal portion according to any one of claims 1 to 3, wherein: 前記電界緩和層は、エラストマー材料に酸化亜鉛またはシリコンカーバイトを充填したもので形成されていることを特徴とする請求項１乃至請求項６何れか１項記載のケーブル終端部。   The cable termination portion according to any one of claims 1 to 6, wherein the electric field relaxation layer is formed of an elastomer material filled with zinc oxide or silicon carbide. 前記電界緩和層は、前記ケーブル絶縁層の外周または前記第１の補助絶縁層の外周から前記ストレスコーンの半導電部の頂部外周に跨って設けられていることを特徴とする請求項１乃至請求項７何れか１項記載のケーブル終端部。
The said electric field relaxation layer is provided ranging over the outer periphery of the top part of the semiconductive part of the said stress cone from the outer periphery of the said cable insulating layer or the outer periphery of the said 1st auxiliary | assistant insulating layer. Item 8. The cable termination portion according to any one of Items7.
JP2004143356A 2004-05-13 2004-05-13 Cable termination Expired - Lifetime JP4495514B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011087447A (en) * 2009-10-19 2011-04-28 Toshiba Corp Overhead line engagement bushing

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JPS5221695A (en) * 1975-08-11 1977-02-18 Sumitomo Electric Ind Ltd Terminal treatment method for polyethylenevinyl theath bridging cable
JPH04118731U (en) * 1991-04-03 1992-10-23 藤倉電線株式会社 Rubber molded body for cables
JPH0850807A (en) * 1994-08-08 1996-02-20 Sumitomo Electric Ind Ltd Insulating rubber material with high dielectric constant
JP2000312430A (en) * 1999-04-23 2000-11-07 Furukawa Electric Co Ltd:The Connecting part of crosslinked-polyethylene-insulated power cable

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4733280A (en) * 1969-09-15 1972-11-17
JPS5221695A (en) * 1975-08-11 1977-02-18 Sumitomo Electric Ind Ltd Terminal treatment method for polyethylenevinyl theath bridging cable
JPH04118731U (en) * 1991-04-03 1992-10-23 藤倉電線株式会社 Rubber molded body for cables
JPH0850807A (en) * 1994-08-08 1996-02-20 Sumitomo Electric Ind Ltd Insulating rubber material with high dielectric constant
JP2000312430A (en) * 1999-04-23 2000-11-07 Furukawa Electric Co Ltd:The Connecting part of crosslinked-polyethylene-insulated power cable

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011087447A (en) * 2009-10-19 2011-04-28 Toshiba Corp Overhead line engagement bushing

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