JP4495514B2

JP4495514B2 - Cable termination

Info

Publication number: JP4495514B2
Application number: JP2004143356A
Authority: JP
Inventors: 均新舘; 信幸瀬間
Original assignee: SWCC Showa Cable Systems Co Ltd
Current assignee: SWCC Corp
Priority date: 2004-05-13
Filing date: 2004-05-13
Publication date: 2010-07-07
Anticipated expiration: 2024-05-13
Also published as: JP2005328610A

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。 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.

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。 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).

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。 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、半導電部および半導電部の先端部側に一体的に設けられる絶縁部を有するストレスコーンと、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る電界緩和層とを備え、半導電部は、ケーブル外部半導電層の先端部近傍の外周に装着される半導電性の円筒状部と、円筒状部の先端部側に連設されケーブル外部半導電層の先端部外周にそれ自身の先端部をケーブルの端末側に向けて装着されるベルマウス部とを備え、絶縁部は、ベルマウス部の外周を覆う絶縁性のスカート状部と、スカート状部の先端側に連設されケーブルの端末側に向けて漸次縮径するテーパ部とを備え、電界緩和層は、半導電部の外周に接触し、半導電部と絶縁部の外周からケーブル絶縁層の外周に跨って設けられているものである。 The cable termination portion according to the first aspect of the present invention includes a cable end portion in which a cable end is stepped off to expose a cable insulating layer and a cable outer semiconductive layer, and the tips of the semiconductive portion and the semiconductive portion. A stress cone having an insulating part integrally provided on the side of the cable, and an electric field relaxation layer formed of an elastomer material filled with zinc oxide or silicon carbide. A semiconductive cylindrical portion mounted on the outer periphery in the vicinity of the distal end portion of the cable, and the end portion of the cylindrical portion connected to the distal end side of the cylindrical portion. A bell mouth part that is attached toward the cable , and the insulating part is an insulating skirt that covers the outer periphery of the bell mouth part, and is connected to the distal end side of the skirt part and gradually toward the end of the cable. Taper to reduce diameter With the door, the electric field relaxation layer is in contact with the outer periphery of the semiconductive portion, in which are provided over the periphery of the insulating portion semiconductive portion on the outer periphery of the cable insulation layer.

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、半導電部および半導電部の先端部側に一体的に設けられる絶縁部を有するストレスコーンと、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る電界緩和層とを備え、半導電部は、ケーブル外部半導電層の先端部近傍の外周に装着される半導電性の円筒状部と、円筒状部の先端部側に連設されケーブル外部半導電層の先端部外周にそれ自身の先端部をケーブルの端末側に向けて装着されるベルマウス部とを備え、絶縁部は、ベルマウス部の外周を覆う絶縁性のスカート状部と、ベルマウス部の先端部側に連設されケーブル絶縁層の外周に装着される円筒状でその外径はスカート状部の外径と略同等とされた第１の補助絶縁層とを備え、電界緩和層は、半導電部の外周に接触し、半導電部と絶縁部の外周から第１の補助絶縁層の外周に跨って設けられているものである。 The cable termination portion according to the second aspect of the present invention includes a cable end portion in which a cable end is stepped off to expose a cable insulating layer and a cable outer semiconductive layer, and a tip end side of the semiconductive portion and the semiconductive portion. A stress cone having an insulating portion provided integrally with an electric field relaxation layer formed by filling an elastomer material with zinc oxide or silicon carbide, and the semiconductive portion is a tip of a semiconductive layer outside the cable. A semiconductive cylindrical part mounted on the outer periphery in the vicinity of the cable part, and a tip part of the outer part of the cable externally connected to the tip part side of the cylindrical part. The insulating part is attached to the outer periphery of the cable insulating layer connected to the distal end side of the bell mouth part and the insulating skirt that covers the outer periphery of the bell mouth part. a cylindrical The outer diameter of a first auxiliary insulating layer that is the outer diameter of the skirt portion and substantially equal, the electric field relaxation layer is in contact with the outer periphery of the semiconductive portion, first from the outer periphery of the insulating portion semiconductive portion It is provided across the outer periphery of one auxiliary insulating layer.

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、半導電部および半導電部の先端部側に一体的に設けられる絶縁部を有するストレスコーンと、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る電界緩和層とを備え、半導電部は、ケーブル外部半導電層の先端部近傍の外周に装着される半導電性の円筒状部と、円筒状部の先端部側に連設されケーブル外部半導電層の先端部外周にそれ自身の先端部をケーブルの端末側に向けて装着されるベルマウス部とを備え、絶縁部は、ベルマウス部の外周を覆う絶縁性のスカート状部と、スカート状部の先端側に連設されケーブルの端末側に向けて漸次縮径するテーパ部とを備え、電界緩和層は、半導電部の外周に接触し、半導電部と絶縁部の外周からケーブル絶縁層の外周に跨って設けられ、ケーブル絶縁層上の電界緩和層の外周には、スカート状部の外径と略同等の外径の円筒状の第２の補助絶縁層が装着されているものである。 The cable termination portion according to the third aspect of the present invention includes a cable end portion in which the end of the cable is stripped to expose the cable insulating layer and the cable outer semiconductive layer, and the tip end side of the semiconductive portion and the semiconductive portion A stress cone having an insulating portion provided integrally with an electric field relaxation layer formed by filling an elastomer material with zinc oxide or silicon carbide, and the semiconductive portion is a tip of a semiconductive layer outside the cable. A semiconductive cylindrical part mounted on the outer periphery in the vicinity of the cable part, and a tip part of the outer part of the cable externally connected to the tip part side of the cylindrical part. The insulating part is an insulating skirt that covers the outer periphery of the bell mouth part, and the diameter of the insulating part is gradually reduced toward the end of the cable. Taper With the door, the electric field relaxation layer is in contact with the outer periphery of the semiconductive portion, provided to extend over the outer periphery of the insulating portion semiconductive portion on the outer periphery of the cable insulation layer, the outer periphery of the electric field relaxation layer on the cable insulation layer A cylindrical second auxiliary insulating layer having an outer diameter substantially equal to the outer diameter of the skirt-like portion is mounted.

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２の態様のケーブル終端部において、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 the second aspect, a plurality of flanges protrude from the outer periphery of the electric field relaxation layer on the first auxiliary insulating layer so as to be spaced apart along the longitudinal direction. It is what has been.

本発明の第１の態様乃至第６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 portions of the first to sixth aspects of the present invention, since the stress cone is attached to 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 terminal 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１３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 13.

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（ＳｉＣ）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 (SiC).

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 straddling the outer periphery of the cable insulating layer 12 on the outer periphery of the stress cone 3. Since the relaxation 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.

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２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 closes the opening of the insulating cylinder 51 above and below the insulating cylinder 51 disposed on the outer periphery of the electric field relaxation layer 4 shown in FIG. 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。An explanatory view showing voltage-current characteristics of a ZnO layer.

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

A stress having an end portion of a cable and a cable end portion in which a cable insulating layer and a cable outer semiconductive layer are exposed, and a semiconductive portion and an insulating portion provided integrally on the tip end side of the semiconductive portion A cone and an electric field relaxation layer formed of an elastomer material filled with zinc oxide or silicon carbide,
The semiconductive portion includes a semiconductive cylindrical portion attached to the outer periphery in the vicinity of the distal end portion of the cable external semiconductive layer, and a continuous portion on the distal end side of the cylindrical portion. A bell mouth part mounted on the outer periphery of the tip part with its own tip part facing the terminal side of the cable,
The insulating portion includes an insulating skirt-like portion that covers the outer periphery of the bell mouth portion, and a tapered portion that is continuously provided on the distal end side of the skirt-like portion and gradually decreases in diameter toward the terminal side of the cable,
The cable termination portion, wherein the electric field relaxation layer is in contact with the outer periphery of the semiconductive portion and is provided across the outer periphery of the cable insulating layer from the outer periphery of the semiconductive portion and the insulating portion.

A cable end portion in which a cable end is stepped off to expose a cable insulating layer and a cable external semiconductive layer; and a stress cone having a semiconductive portion and an insulating portion integrally provided on the tip end side of the semiconductive portion; An electric field relaxation layer formed of an elastomer material filled with zinc oxide or silicon carbide,
The semiconductive portion includes a semiconductive cylindrical portion attached to the outer periphery in the vicinity of the distal end portion of the cable external semiconductive layer, and a continuous portion on the distal end side of the cylindrical portion. A bell mouth part mounted on the outer periphery of the tip part with its own tip part facing the terminal side of the cable,
The insulating part is an insulating skirt-like part that covers the outer periphery of the bell mouth part, and a cylindrical shape that is continuously provided on the tip side of the bell mouth part and is attached to the outer periphery of the cable insulating layer. and a first auxiliary insulating layer that is the outer diameter substantially equal to the skirt portion,
The electric field relaxation layer is in contact with the outer periphery of the semiconductive portion, and is provided across the outer periphery of the first auxiliary insulating layer from the outer periphery of the semiconductive portion and the insulating portion. Department.

A cable end portion in which a cable end is stepped off to expose a cable insulating layer and a cable external semiconductive layer; and a stress cone having a semiconductive portion and an insulating portion integrally provided on the tip end side of the semiconductive portion; An electric field relaxation layer formed of an elastomer material filled with zinc oxide or silicon carbide,
The semiconductive portion includes a semiconductive cylindrical portion attached to the outer periphery in the vicinity of the distal end portion of the cable external semiconductive layer, and a continuous portion on the distal end side of the cylindrical portion. A bell mouth part mounted on the outer periphery of the tip part with its own tip part facing the terminal side of the cable,
The insulating portion includes an insulating skirt-like portion that covers the outer periphery of the bell mouth portion, and a tapered portion that is continuously provided on the distal end side of the skirt-like portion and gradually decreases in diameter toward the terminal side of the cable,
The electric field relaxation layer is in contact with the outer periphery of the semiconductive portion, and is provided across the outer periphery of the cable insulating layer from the outer periphery of the semiconductive portion and the insulating portion ,
A cable termination characterized in that a cylindrical second auxiliary insulating layer having an outer diameter substantially equal to the outer diameter of the skirt-like portion is attached to the outer periphery of the electric field relaxation layer on the cable insulating layer. Department.

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.

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.

3. The cable termination portion according to claim 2, wherein a plurality of flange portions are provided so as to protrude from the outer periphery of the electric field relaxation layer on the first auxiliary insulating layer along the longitudinal direction.