JP5027266B2 - Polymer sleeve and cable termination connection - Google Patents

Polymer sleeve and cable termination connection Download PDF

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JP5027266B2
JP5027266B2 JP2010054594A JP2010054594A JP5027266B2 JP 5027266 B2 JP5027266 B2 JP 5027266B2 JP 2010054594 A JP2010054594 A JP 2010054594A JP 2010054594 A JP2010054594 A JP 2010054594A JP 5027266 B2 JP5027266 B2 JP 5027266B2
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insulating cylinder
metal fitting
conductive layer
conductive
polymer
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JP2011188719A (en
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和久 足立
信幸 瀬間
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SWCC Showa Cable Systems Co Ltd
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本発明は、ポリマー套管及びケーブル終端接続部に係り、詳細には、電力ケーブルの気中終端接続部又はブッシングに用いられるポリマー套管及びポリマー套管を用いたケーブル終端接続部に関する。   The present invention relates to a polymer cannula and a cable end connection, and more particularly to a polymer cannula used for an air end connection or bushing of a power cable and a cable end connection using a polymer cannula.

近時、套管の軽量化、スリム化、縮小化、套管種類の共通化及び作業工程の簡略化などを図る観点から、エポキシブッシング等の絶縁体の表面にシリコーンゴム等のポリマー被覆体を直接モールドした完全乾式のポリマー套管が使用されている。   Recently, from the viewpoint of reducing the weight of the cannula, slimming, reducing the size of the cannula, standardizing the cannula type and simplifying the work process, a polymer covering such as silicone rubber has been applied to the surface of an insulator such as an epoxy bushing. Directly molded, completely dry polymer sleeves are used.

特許文献1には、電力ケーブルの気中終端に使用されるポリマー套管を用いたケーブル終端接続部が開示されている。特許文献1記載のケーブル終端接続部は、ポリマー套管とケーブル端末部とから構成されている。ポリマー套管は、中心に導体引出棒を有し、下端部にケーブル受容口を有する硬質の絶縁筒と、絶縁筒の外周に設けられ、外周に多数の襞部が長手方向に離間して形成されたポリマー被覆体と、絶縁筒の周面から外方に突出されたフランジ部を有する支持金具とを備えている。ポリマー被覆体は、支持金具よりも上位に位置され、ケーブル受容口は支持金具よりも下位に位置されている。絶縁筒の下端は、中間金具に収容される。中間金具内部には、絶縁筒の底面部に密着するOリングが嵌め込まれる。   Patent Document 1 discloses a cable terminal connection portion using a polymer sleeve used for an air cable end of an electric power cable. The cable terminal connection part described in Patent Document 1 is composed of a polymer sleeve and a cable terminal part. The polymer sleeve has a conductor lead bar at the center and a hard insulating tube with a cable receiving port at the lower end, and is provided on the outer periphery of the insulating tube, with a number of flanges spaced apart in the longitudinal direction on the outer periphery. And a support fitting having a flange portion protruding outward from the peripheral surface of the insulating cylinder. The polymer covering is positioned higher than the support metal, and the cable receiving port is positioned lower than the support metal. The lower end of the insulating cylinder is accommodated in the intermediate metal fitting. An O-ring that is in close contact with the bottom surface of the insulating cylinder is fitted inside the intermediate fitting.

特許文献2には、支持碍子を使用せずにケーブル終端接続部を組み立てることができるポリマー套管が開示されている。特許文献2記載のポリマー套管は、導体引出棒の外周に設けられた固体絶縁体と、固体絶縁体の外周に設けられたポリマー被覆体と、ポリマー被覆体の外周に長手方向に離間して設けられた多数個の笠状の襞部とを備えている。固体絶縁体は、大径固体絶縁体と小径固体絶縁体とを有し、その連設部分には環状の取付金具が埋設・固定され、小径固体絶縁体の取付金具の近傍の外周には電界緩和用の埋込金具が埋設されている。また、大径固体絶縁体の下端部近傍の外周には、銀ペイントの塗布層などからなる導電層が設けられ、この導電層の外周にはシリコーンゴムなどからなる絶縁層が設けられている。   Patent Document 2 discloses a polymer sleeve that can assemble a cable end connection without using a support insulator. The polymer cannula described in Patent Document 2 includes a solid insulator provided on the outer periphery of the conductor lead bar, a polymer coating provided on the outer periphery of the solid insulator, and a circumferentially spaced outer periphery of the polymer coating. It is provided with a large number of shade-shaped buttocks. The solid insulator has a large-diameter solid insulator and a small-diameter solid insulator, and an annular mounting bracket is embedded and fixed in the connected portion, and an electric field is provided on the outer periphery in the vicinity of the small-diameter solid insulator mounting bracket. An embedding bracket for relaxation is embedded. A conductive layer made of a silver paint coating layer or the like is provided on the outer periphery in the vicinity of the lower end portion of the large-diameter solid insulator, and an insulating layer made of silicone rubber or the like is provided on the outer periphery of the conductive layer.

特開2006−33899号公報JP 2006-33899 A 特開2007−103228号公報JP 2007-103228 A

しかしながら、このような従来のポリマー套管にあっては、エポキシブッシングの外周に銀ペイント等の導電塗料の塗布層などからなる導電層を、遮蔽金具(特許文献1の支持金具に相当、特許文献2の取付金具及び埋込金具に相当)の下面に跨って形成することにより、遮蔽金具と電気的に接続していた。例えば、特許文献2記載のポリマー套管では、大径固体絶縁体に形成された導電層は、その端部のみが取付金具(遮蔽金具)に電気的に接続されている。このため、使用中のヒートサイクルにより、エポキシブッシングの外周から遮蔽金具(取付金具)に跨って形成したつなぎの部分(エポキシブッシング外周と遮蔽金具(取付金具)とが接する部分)において、導電層が剥離するおそれがある。導電層が剥離することにより、ひいては導電層と遮蔽金具(取付金具)との電気的接触が離れてしまうことがありうる。遮蔽金具と導電層が離れた場合、導電層が電気的に浮いて部分放電が発生するおそれがある。また、導電層を導電塗料の塗布ではなく、金属蒸着などで形成した場合も同様の問題が生じるおそれがある。   However, in such a conventional polymer sleeve, a conductive layer made of a coating layer of conductive paint such as silver paint is provided on the outer periphery of the epoxy bushing. 2) (corresponding to the mounting bracket and the embedded bracket of No. 2), it was electrically connected to the shielding bracket. For example, in the polymer cannula described in Patent Document 2, only the end of the conductive layer formed on the large-diameter solid insulator is electrically connected to the mounting bracket (shielding bracket). For this reason, the conductive layer is formed in the connecting part (the part where the outer periphery of the epoxy bushing and the shielding metal fitting (mounting metal fitting are in contact)) formed from the outer periphery of the epoxy bushing to the shielding metal fitting (mounting metal fitting) by the heat cycle in use. There is a risk of peeling. When the conductive layer is peeled off, the electrical contact between the conductive layer and the shielding metal fitting (mounting metal fitting) may be separated. When the shielding metal fitting is separated from the conductive layer, the conductive layer may be electrically floated and partial discharge may occur. In addition, the same problem may occur when the conductive layer is formed not by application of a conductive paint but by metal deposition.

本発明はかかる点に鑑みてなされたものであり、ヒートサイクルにより遮蔽金具と導電層とが離れた場合であっても、遮蔽金具と導電層とを電気的に接続することができ、部分放電の発生を防ぐことができるポリマー套管及びケーブル終端接続部を提供することを目的とする。   The present invention has been made in view of such points, and even when the shielding metal fitting and the conductive layer are separated by heat cycle, the shielding metal fitting and the conductive layer can be electrically connected, and partial discharge is performed. It is an object of the present invention to provide a polymer cannula and a cable terminal connection that can prevent the occurrence of the above.

本発明のポリマー套管は、高電圧に接続される導体を先端部に有する硬質の絶縁筒と前記絶縁筒に埋設される埋込部と該絶縁筒の周面から半径方向外方に突出したフランジ部とを有する遮蔽金具と、前記遮蔽金具よりも下方部位の前記絶縁筒の外周面に導電性材料により形成された導電層と、前記導電層が形成された前記絶縁筒の外周面に配設され、上端部が前記フランジ部の下端面に取付けられる環状の下部金具とを備えるポリマー套管であって、前記下部金具の上端部の内径角部に、前記導電層が形成された前記絶縁筒の外周面と前記遮蔽金具の前記フランジ部の下端面とに向かって開口する環状の溝部と、前記溝部に配設される導電性Oリングと、を備える構成を採る。   The polymer sleeve of the present invention protrudes radially outward from a hard insulating tube having a conductor connected to a high voltage at a tip portion, an embedded portion embedded in the insulating tube, and a peripheral surface of the insulating tube. A shielding metal fitting having a flange portion, a conductive layer formed of a conductive material on the outer peripheral surface of the insulating cylinder below the shielding metal fitting, and an outer peripheral surface of the insulating cylinder on which the conductive layer is formed. A polymer sleeve having an annular lower fitting attached to the lower end surface of the flange portion, the insulation having the conductive layer formed at an inner diameter corner of the upper end portion of the lower fitting. A configuration including an annular groove opening toward the outer peripheral surface of the cylinder and the lower end surface of the flange portion of the shielding metal fitting, and a conductive O-ring disposed in the groove is adopted.

本発明のケーブル終端接続部は、上記構成のポリマー套管の絶縁筒の下端部にケーブル端末の受容口を有し、ケーブル端末の受容口に、ケーブル端末が装着されている構成を採る。   The cable termination connecting portion of the present invention has a configuration in which a cable terminal receiving port is provided at the lower end of the insulating tube of the polymer sleeve having the above-described configuration, and the cable terminal is mounted in the cable terminal receiving port.

本発明によれば、使用中のヒートサイクルにより、導電層が絶縁筒の外周と遮蔽金具とのつなぎの部分で剥離し、遮蔽金具と導電層との電気的接触が離れた場合であっても、遮蔽金具と導電層とを電気的に接続することができ、部分放電の発生を防ぐことができる。   According to the present invention, even when the conductive layer is peeled off at the connecting portion between the outer periphery of the insulating cylinder and the shielding fitting due to the heat cycle in use, the electrical contact between the shielding fitting and the conductive layer is separated. In addition, the shielding metal fitting and the conductive layer can be electrically connected, and the occurrence of partial discharge can be prevented.

本発明の実施の形態に係るポリマー套管の構成を示す部分断面図The fragmentary sectional view which shows the structure of the polymer sleeve which concerns on embodiment of this invention 上記実施の形態に係るポリマー套管の構成を示す部分拡大断面図The partial expanded sectional view which shows the structure of the polymer sleeve concerning the said embodiment

以下、本発明の実施の形態について、図面を参照して詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(実施の形態)
図1は、本発明の実施の形態に係るポリマー套管の構成を示す部分断面図、図2は、図1のポリマー套管の部分拡大断面図である。本実施の形態は、先端部は架空線や引込線など高電圧に接続され、下端部に電力ケーブルの端末を接続するための気中終端接続部に適用した例である。
(Embodiment)
FIG. 1 is a partial cross-sectional view showing a configuration of a polymer cannula according to an embodiment of the present invention, and FIG. 2 is a partially enlarged cross-sectional view of the polymer cannula of FIG. This embodiment is an example in which the tip end is connected to a high voltage such as an overhead wire or a lead-in wire, and is applied to an air termination connection portion for connecting a power cable terminal to the lower end portion.

以下の説明において、内部導体、絶縁筒及び遮蔽金具の「先端部」とは、高圧側をいい、図中では上方向に相当し、また、内部導体、絶縁筒、及び遮蔽金具の「下端部」とは、低圧側をいい、図中では下方向に相当する。   In the following description, the “leading end” of the inner conductor, the insulating cylinder, and the shielding metal fitting means the high voltage side, and corresponds to the upper direction in the drawing, and the “lower end portion” of the inner conductor, the insulating cylinder, and the shielding metal fitting. "Means the low pressure side and corresponds to the downward direction in the figure.

図1に示すように、ポリマー套管100は、中心に高電圧に接続される導体としての導体引出棒110を有し、下端部にケーブル端末の受容口190を有する硬質の絶縁筒120と、絶縁筒120の外周に設けられ、高分子絶縁材料により、それ自身の外周に複数の襞部が長手方向に離間して形成されたポリマー被覆体130とを備える。   As shown in FIG. 1, the polymer cannula 100 has a conductor extraction rod 110 as a conductor connected to a high voltage at the center and a rigid insulating cylinder 120 having a cable terminal receiving port 190 at the lower end, It is provided on the outer periphery of the insulating cylinder 120, and is provided with a polymer covering 130 in which a plurality of flanges are formed on the outer periphery of the insulating cylinder 120 so as to be spaced apart in the longitudinal direction.

導体引出棒110は、銅若しくは銅合金、又はアルミニウム若しくはアルミニウム合金等の通電に適した金属製の棒体で形成されている。   The conductor extraction rod 110 is formed of a metal rod suitable for energization, such as copper or copper alloy, or aluminum or aluminum alloy.

導体引出棒110の先端部は、絶縁筒120の先端部から突出されており、硬質の絶縁筒の先端部に、高電圧に接続される導体を有した構造となっている。また導体引出棒110の下端部には導体挿入孔110aが設けられている。導体挿入孔110aの奥壁の中央部分には、円柱状のボス110bが開口部に向かって導体挿入孔110aと同心状に突設されている。ボス110bの外周には環状の凹溝110cが設けられている。凹溝110cには、導体引出棒110に接続端子を引き留めるためのチューリップコンタクト115が取り付けられる。チューリップコンタクト115は、円形に配列した複数個のフィンガー接触子を有するリング状接触子115aと、リング状接触子115aの上下外周に離間して配設された一対のガータースプリング115b,115cとを有する。   The leading end portion of the conductor extraction rod 110 protrudes from the leading end portion of the insulating cylinder 120, and has a structure having a conductor connected to a high voltage at the leading end portion of the hard insulating cylinder. A conductor insertion hole 110a is provided at the lower end of the conductor lead bar 110. A cylindrical boss 110b protrudes concentrically with the conductor insertion hole 110a toward the opening at the center of the back wall of the conductor insertion hole 110a. An annular concave groove 110c is provided on the outer periphery of the boss 110b. A tulip contact 115 for securing the connection terminal to the conductor lead bar 110 is attached to the concave groove 110c. The tulip contact 115 includes a ring-shaped contact 115a having a plurality of finger contacts arranged in a circle, and a pair of garter springs 115b and 115c disposed on the upper and lower outer circumferences of the ring-shaped contact 115a. .

絶縁筒120は、導体引出棒110を軸心に配置させた固体絶縁体であり、導体引出棒110外周にモールドにより一体的に形成される。絶縁筒120は、機械的強度の高い材料、例えばエポキシ樹脂やFRP(Fiber Reinforced Plastics)などの硬質プラスチック樹脂で形成される。   The insulating cylinder 120 is a solid insulator in which the conductor extraction rod 110 is disposed in the axial center, and is integrally formed on the outer periphery of the conductor extraction rod 110 by a mold. The insulating cylinder 120 is formed of a material having high mechanical strength, for example, a hard plastic resin such as an epoxy resin or FRP (Fiber Reinforced Plastics).

絶縁筒120は、導体引出棒110の下方部位の外周面、すなわち導体挿入孔110aと対応する部分の外周面に設けられる大径絶縁筒121と、この大径絶縁筒121の上部に連設され、導体引出棒110の先端部を除く部分の外周面に設けられる小径絶縁筒122とを備える。   The insulating cylinder 120 is connected to a large-diameter insulating cylinder 121 provided on the outer peripheral surface of the lower portion of the conductor extraction rod 110, that is, the outer peripheral surface of the portion corresponding to the conductor insertion hole 110a, and the upper portion of the large-diameter insulating cylinder 121. And a small-diameter insulating tube 122 provided on the outer peripheral surface of the portion excluding the tip of the conductor lead bar 110.

大径絶縁筒121の下端部には、ケーブル端末部のストレスコーン(不図示)を受容するコーン状の受容口190が設けられており、この受容口190は導体引出棒110の導体挿入孔110aと連通している。なお、本実施の形態では、導体挿入孔110aと対応する部分を小径絶縁筒121よりも大径化しているが、この部分を小径絶縁筒122と同径にしてもよい。   A cone-shaped receiving port 190 for receiving a stress cone (not shown) of the cable end portion is provided at the lower end portion of the large-diameter insulating cylinder 121. The receiving port 190 is a conductor insertion hole 110a of the conductor lead bar 110. Communicated with. In the present embodiment, the portion corresponding to the conductor insertion hole 110 a has a larger diameter than the small-diameter insulating tube 121, but this portion may have the same diameter as the small-diameter insulating tube 122.

ポリマー被覆体130は、機器の外部(気中)に配置され、電気絶縁性及び耐候性を有し、電気絶縁性及び耐候性に優れた材料、例えば、シリコーンポリマー(シリコーンゴム)などの高分子絶縁材料により形成される。   The polymer covering 130 is disposed outside (in the air) of the device, has electrical insulation and weather resistance, and is excellent in electrical insulation and weather resistance, for example, a polymer such as silicone polymer (silicone rubber). It is formed of an insulating material.

ポリマー被覆体130は、小径絶縁筒122の外周面に設けられ、その外周面には多数個の襞部130aがポリマー被覆体130の長手方向に沿って離間して形成されている。襞部130aは、高電圧側である導体引出棒110の上端部と、接地側である後述する下部金具160とが閃絡することを防止するため、ポリマー被覆体130の表面漏洩距離を確保する目的で設けられている。図1では、襞部130aは、大径襞部と小径襞部とが交互に設けられている。   The polymer cover 130 is provided on the outer peripheral surface of the small-diameter insulating cylinder 122, and a large number of flanges 130 a are formed on the outer peripheral surface so as to be separated along the longitudinal direction of the polymer cover 130. The flange portion 130a secures a surface leakage distance of the polymer covering 130 in order to prevent the upper end portion of the conductor lead bar 110 on the high voltage side and the lower metal fitting 160 (described later) on the ground side from flashing. It is provided for the purpose. In FIG. 1, the collar part 130a is provided with large-diameter collar parts and small-diameter collar parts alternately.

ポリマー套管100は、大径絶縁筒121と小径絶縁筒122の連設部分に電界緩和用の環状の遮蔽金具140を備える。   The polymer cannula 100 includes an annular shielding metal fitting 140 for electric field relaxation at a continuous portion of the large diameter insulating cylinder 121 and the small diameter insulating cylinder 122.

遮蔽金具140は、絶縁筒120の大径絶縁筒121と小径絶縁筒122との連設部に外表面のみを露出するように埋設される筒状部141と、筒状部141の内側上端部に筒状部141と同心状に連設され、上端部を小径絶縁筒122側に向けて同心状に埋設される円筒部142と、筒状部141の周面から半径方向外方に突出したフランジ部143とを有する。上記筒状部141及び円筒部142は、ポリマー被覆体130の下方部位の絶縁筒120に埋設される埋込部を形成する。本実施の形態では、フランジ部143の内径は、図1では小径絶縁筒122の外径と略同径に形成されている。   The shielding metal fitting 140 includes a cylindrical portion 141 embedded so as to expose only the outer surface of a continuous portion between the large-diameter insulating cylinder 121 and the small-diameter insulating cylinder 122 of the insulating cylinder 120, and an inner upper end of the cylindrical portion 141. A cylindrical portion 142 that is concentrically connected to the cylindrical portion 141 and is concentrically embedded with the upper end facing the small-diameter insulating cylinder 122 side, and protrudes radially outward from the peripheral surface of the cylindrical portion 141. And a flange portion 143. The cylindrical part 141 and the cylindrical part 142 form an embedded part embedded in the insulating cylinder 120 below the polymer cover 130. In the present embodiment, the inner diameter of the flange portion 143 is formed to be substantially the same as the outer diameter of the small-diameter insulating cylinder 122 in FIG.

ポリマー套管100は、遮蔽金具140よりも下方部位の絶縁筒120の外周面に導電層150を備える。   The polymer sleeve 100 includes a conductive layer 150 on the outer peripheral surface of the insulating cylinder 120 at a lower part than the shielding metal fitting 140.

導電層150は、大径絶縁筒121の外面に、導電性材料として銀ペイントなどの導電塗料を塗布して形成される。導電層150の形成により、大径絶縁筒121表面を等電位とし、電界を一定に保つことができる。導電層150は、大径絶縁筒121の、遮蔽金具140部以外の外面を覆い、且つ遮蔽金具140のフランジ部143の下面の一部領域まで延びて形成される。大径絶縁筒121の外周面の導電層150は、遮蔽金具140のフランジ部143の下端面に接触し、電気的に接続されている。ここでは、導電層150は大径絶縁筒121の外面から下端面に延びて形成されている。   The conductive layer 150 is formed by applying a conductive paint such as silver paint as a conductive material on the outer surface of the large-diameter insulating cylinder 121. By forming the conductive layer 150, the surface of the large-diameter insulating cylinder 121 can be equipotential and the electric field can be kept constant. The conductive layer 150 is formed to cover the outer surface of the large-diameter insulating cylinder 121 other than the shielding metal fitting 140 part and to extend to a partial region of the lower surface of the flange part 143 of the shielding metal fitting 140. The conductive layer 150 on the outer peripheral surface of the large-diameter insulating cylinder 121 is in contact with and electrically connected to the lower end surface of the flange portion 143 of the shielding metal fitting 140. Here, the conductive layer 150 is formed to extend from the outer surface of the large-diameter insulating cylinder 121 to the lower end surface.

ポリマー套管100は、導電層150が形成された絶縁筒120の外周面に配設され、上端部がフランジ部143の下端面に取付けられる環状の下部金具160を備える。   The polymer sleeve 100 includes an annular lower metal fitting 160 that is disposed on the outer peripheral surface of the insulating cylinder 120 on which the conductive layer 150 is formed, and whose upper end portion is attached to the lower end surface of the flange portion 143.

下部金具160は、導電層150が形成された大径絶縁筒121の外周面を囲繞し、上端部が遮蔽金具140のフランジ部143の下端面に、締付ボルト181により固定される。   The lower metal fitting 160 surrounds the outer peripheral surface of the large-diameter insulating cylinder 121 on which the conductive layer 150 is formed, and the upper end portion is fixed to the lower end surface of the flange portion 143 of the shielding metal fitting 140 by the fastening bolt 181.

下部金具160は、大径絶縁筒121の外周面を覆って大径絶縁筒121を保護する筒部161と、筒部161の上端部位置から径方向外方に向けて延出される固定フランジ部162と、大径絶縁筒121の外周面の導電層150と遮蔽金具140の底部との双方に接触するように配設された導電性Oリング170を収納する溝部163とを有する。   The lower metal fitting 160 covers the outer peripheral surface of the large-diameter insulating tube 121 and protects the large-diameter insulating tube 121, and a fixed flange portion that extends radially outward from the upper end position of the tube portion 161. 162 and a groove portion 163 that accommodates the conductive O-ring 170 disposed so as to contact both the conductive layer 150 on the outer peripheral surface of the large-diameter insulating cylinder 121 and the bottom portion of the shielding metal fitting 140.

また、下部金具160は、筒部161内部の下端面に導電層150と電気的に接触する導電性Oリング191を収納する溝部164を有する。   Further, the lower metal fitting 160 has a groove portion 164 that houses a conductive O-ring 191 that is in electrical contact with the conductive layer 150 at the lower end surface inside the cylindrical portion 161.

図2に示すように、溝部163は、下部金具160の上端部の内径角部に、導電層150が形成された絶縁筒120の外周面と遮蔽金具140のフランジ部143の下端面とに向かって開口する。   As shown in FIG. 2, the groove portion 163 faces the outer peripheral surface of the insulating cylinder 120 in which the conductive layer 150 is formed and the lower end surface of the flange portion 143 of the shielding metal fitting 140 at the inner diameter corner of the upper end portion of the lower metal fitting 160. Open.

溝部163は、導電層150が形成された大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面とが直交する筒部161の上端部位置の角部(固定フランジ部162の内周面の端部)において、筒部161の上端部位置の角部を断面L字形状に切り欠くように形成される。このため、断面L字形状の環状の溝部163は、一方の溝面が、導電層150が形成された大径絶縁筒121の外周面に向かって開口し、他方の溝面が遮蔽金具140のフランジ部143の下端面に向かって開口する。   The groove portion 163 is a corner portion of the upper end portion of the cylindrical portion 161 (the fixed flange portion 162 of the fixed flange portion 162) where the outer peripheral surface of the large-diameter insulating cylinder 121 in which the conductive layer 150 is formed and the lower end surface of the flange portion 143 of the shielding metal fitting 140 are orthogonal to each other. At the end portion of the inner peripheral surface, the corner portion at the upper end position of the cylindrical portion 161 is formed to be cut out in an L-shaped cross section. For this reason, the annular groove portion 163 having an L-shaped cross section has one groove surface that opens toward the outer peripheral surface of the large-diameter insulating cylinder 121 in which the conductive layer 150 is formed, and the other groove surface of the shielding metal fitting 140. It opens toward the lower end surface of the flange portion 143.

溝部163は、導電性Oリング170を溝部163に収納した場合、収納した導電性Oリング170が、大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面との双方に弾性変形しながら密着可能な溝深さに形成する。   When the conductive O-ring 170 is stored in the groove 163, the groove 163 is elastic to both the outer peripheral surface of the large-diameter insulating cylinder 121 and the lower end surface of the flange 143 of the shielding metal fitting 140. It is formed to a groove depth that allows close contact while deforming.

溝部163は、溝部163に収納した導電性Oリング170を、大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面との双方に密着させる形状であればよく、断面L字形状には限定されない。例えば、この溝部163は、曲面の凹溝、又はテーパ面形状であってもよい。但し、本実施の形態で採用した断面L字形状の溝部163は、大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面との双方において、その両端面で導電性Oリング170を適度に押圧することで導電性Oリング170の密着性を高めることができる。また、断面L字形状の溝部163は、凹溝などに比べ切削加工が容易である。また、導電性Oリング170を溝部163に嵌着する組立作業も容易で、且つ組立の際の導電性Oリング170の配置ズレなども発生しにくい効果がある。   The groove portion 163 may have any shape as long as the conductive O-ring 170 accommodated in the groove portion 163 is in close contact with both the outer peripheral surface of the large-diameter insulating cylinder 121 and the lower end surface of the flange portion 143 of the shielding metal fitting 140. The shape is not limited. For example, the groove 163 may be a curved concave groove or a tapered surface. However, the groove portion 163 having an L-shaped cross section employed in the present embodiment is a conductive O-ring at both end surfaces of the outer peripheral surface of the large-diameter insulating tube 121 and the lower end surface of the flange portion 143 of the shielding metal fitting 140. Adhesiveness of the conductive O-ring 170 can be enhanced by pressing 170 appropriately. Further, the groove portion 163 having an L-shaped cross section is easier to cut than a groove. Further, the assembly operation for fitting the conductive O-ring 170 into the groove portion 163 is easy, and there is an effect that the displacement of the conductive O-ring 170 during the assembly hardly occurs.

ポリマー套管100は、溝部163に配設され、導電層150が形成された絶縁筒120の外周面と遮蔽金具140のフランジ部143の下端面との双方に密着する導電性Oリング170を備える。   The polymer cannula 100 includes a conductive O-ring 170 that is disposed in the groove portion 163 and is in close contact with both the outer peripheral surface of the insulating cylinder 120 on which the conductive layer 150 is formed and the lower end surface of the flange portion 143 of the shielding metal fitting 140. .

導電性Oリング170は、シリコーンゴム又はEPゴムにカーボンを混入して導電性を持たせた導電性弾性リングである。   The conductive O-ring 170 is a conductive elastic ring in which carbon is mixed into silicone rubber or EP rubber to make it conductive.

導電性Oリング170は、導電層150が形成された大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面との双方に密着した状態で配置されることになる。したがって、遮蔽金具140のフランジ部143の下端面と下部金具160の固定フランジ部162の上端面との間の気密性の確保に加えて、導電層150が形成された大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面との間の気密性を確保することができる。この二面に亘るシール機能により、外部から内方中心への水の浸入をより確実に防止することができる。   The conductive O-ring 170 is disposed in close contact with both the outer peripheral surface of the large-diameter insulating cylinder 121 on which the conductive layer 150 is formed and the lower end surface of the flange portion 143 of the shielding metal fitting 140. Therefore, in addition to ensuring airtightness between the lower end surface of the flange portion 143 of the shielding metal fitting 140 and the upper end surface of the fixing flange portion 162 of the lower metal fitting 160, the outer periphery of the large-diameter insulating cylinder 121 in which the conductive layer 150 is formed. Airtightness between the surface and the lower end surface of the flange portion 143 of the shielding metal fitting 140 can be ensured. The sealing function over the two surfaces can more reliably prevent water from entering from the outside into the center of the inside.

さらに、導電性Oリング170は、上記気密性を確保するシール機能に加え、以下の導電性機能を併せ持つ。   Further, the conductive O-ring 170 has the following conductive function in addition to the sealing function for ensuring the above airtightness.

図2破線に示すように、大径絶縁筒121の外面には、銀ペイントなどの導電性塗料の塗布により導電層150が形成されている。ここで、大径絶縁筒121の外面の導電層150のうち、大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面とが直交する部分の導電層150に着目する。上記直交部分において、大径絶縁筒121の外周面の導電層150は、遮蔽金具140のフランジ部143の下端面に接触し、両者は電気的に接続されている。すなわち、大径絶縁筒121の外周面の導電層150は、遮蔽金具140のフランジ部143の下端面において、その端部のみが直接接触している。因みに、従来例では、エポキシブッシングの導電層と下部金具とは、導電層の端部のみの接触により電気的に接続されていた。   As shown by a broken line in FIG. 2, a conductive layer 150 is formed on the outer surface of the large-diameter insulating cylinder 121 by applying a conductive paint such as silver paint. Here, attention is focused on a portion of the conductive layer 150 on the outer surface of the large-diameter insulating cylinder 121 where the outer peripheral surface of the large-diameter insulating cylinder 121 and the lower end surface of the flange portion 143 of the shielding metal fitting 140 are orthogonal to each other. In the orthogonal portion, the conductive layer 150 on the outer peripheral surface of the large-diameter insulating cylinder 121 is in contact with the lower end surface of the flange portion 143 of the shielding metal fitting 140, and both are electrically connected. That is, the conductive layer 150 on the outer peripheral surface of the large-diameter insulating cylinder 121 is in direct contact with only the end portion of the lower end surface of the flange portion 143 of the shielding metal fitting 140. Incidentally, in the conventional example, the conductive layer of the epoxy bushing and the lower metal fitting are electrically connected by contact only with the end portion of the conductive layer.

本実施の形態では、溝部163に配設された導電性Oリング170は、導電層150が形成された大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面との双方の面に密着する。このため、導電層150が形成された大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面とは、導電性Oリング170を介して電気的に接触され、導電層150と遮蔽金具140とを同電位に保持することができる。大径絶縁筒121の外周面の導電層150の端部と遮蔽金具140のフランジ部143の下端面との直接接続に、さらに導電性Oリング170を介した大径絶縁筒121の外周面の導電層150と遮蔽金具140のフランジ部143の下端面との密着による電気的接続が加わることになる。したがって、例えば使用中のヒートサイクルにより遮蔽金具140と導電層150とが離れることがあっても、導電層150が形成された大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面とは、導電性Oリング170を介して常に同電位に保たれる。その結果、遮蔽金具140と導電層150との間が電気的に浮いた状態となることがなく、部分放電の発生を防止することができる。   In the present embodiment, the conductive O-ring 170 disposed in the groove portion 163 has both the outer peripheral surface of the large-diameter insulating cylinder 121 in which the conductive layer 150 is formed and the lower end surface of the flange portion 143 of the shielding metal fitting 140. Adhere to the surface. For this reason, the outer peripheral surface of the large-diameter insulating cylinder 121 on which the conductive layer 150 is formed and the lower end surface of the flange portion 143 of the shielding metal fitting 140 are electrically contacted via the conductive O-ring 170, The shielding metal fitting 140 can be held at the same potential. In addition to the direct connection between the end portion of the conductive layer 150 on the outer peripheral surface of the large-diameter insulating cylinder 121 and the lower end surface of the flange portion 143 of the shielding metal fitting 140, the outer peripheral surface of the large-diameter insulating cylinder 121 via the conductive O-ring 170 is provided. Electrical connection by adhesion between the conductive layer 150 and the lower end surface of the flange portion 143 of the shielding metal fitting 140 is added. Therefore, for example, even if the shielding metal fitting 140 and the conductive layer 150 are separated due to a heat cycle in use, the outer peripheral surface of the large-diameter insulating cylinder 121 on which the conductive layer 150 is formed and the flange portion 143 of the shielding metal fitting 140 are below. The end face is always kept at the same potential via the conductive O-ring 170. As a result, the shielding metal fitting 140 and the conductive layer 150 are not electrically floated, and partial discharge can be prevented.

導電層150が形成された大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面との間で、良好な気密性及び導電性機能を確保するためには、導電性Oリング170が適度に弾性変形しながら、導電性Oリング170が面接触により両面に密着することが好ましい。この観点から、導電性Oリング170の外径寸法及び溝部163の溝深さが決められる。なお、導電性Oリング170を過剰に弾性変形させることは、導電性Oリング170の劣化につながり、シール機能が得られず、また導電性Oリング170の組立作業に手間取ることになる。   In order to ensure good airtightness and a conductive function between the outer peripheral surface of the large-diameter insulating cylinder 121 on which the conductive layer 150 is formed and the lower end surface of the flange portion 143 of the shielding metal fitting 140, a conductive O-ring It is preferable that the conductive O-ring 170 adheres to both surfaces by surface contact while the elastic deformation of the 170 is moderate. From this viewpoint, the outer diameter of the conductive O-ring 170 and the groove depth of the groove 163 are determined. If the conductive O-ring 170 is excessively elastically deformed, the conductive O-ring 170 is deteriorated, a sealing function cannot be obtained, and it takes time to assemble the conductive O-ring 170.

本実施の形態では、上記溝部163に配設された導電性Oリング170に加えて、下部金具160の溝部164に、下部ブッシング121Aの底面部に密着する導電性Oリング191が取付けられる。   In the present embodiment, in addition to the conductive O-ring 170 disposed in the groove 163, a conductive O-ring 191 that is in close contact with the bottom surface of the lower bushing 121A is attached to the groove 164 of the lower metal fitting 160.

導電性Oリング191は、導電性シール部材であり、導電性パッキンでもよい。導電性Oリング191は、ケーブル端末側の気密性を確保するとともに、外部から内部への水の浸入を防止するシール機能と、下部金具160と下部ブッシング121Aの底面部に形成された導電層150とを電気的に接続して、より確実に導電層150と下部金具160とを電気的に接触させる導電性機能とを併せ持つ。   The conductive O-ring 191 is a conductive seal member and may be a conductive packing. The conductive O-ring 191 secures the air tightness on the cable end side, prevents a water from entering from the outside to the inside, and the conductive layer 150 formed on the bottom surface of the lower metal fitting 160 and the lower bushing 121A. Are electrically connected to each other so that the conductive layer 150 and the lower metal fitting 160 are in electrical contact with each other more reliably.

このように、ポリマー套管100を用いた完全乾式の気中終端接続部の構成上、下部金具160の上端部の内径角部の溝部163に配設される導電性Oリング170と、下部金具160内部の下端面の溝部164に配設される導電性Oリング191との、2つの導電性シール部材を有している。   As described above, the conductive O-ring 170 disposed in the groove portion 163 in the inner diameter corner portion of the upper end portion of the lower fitting 160, and the lower fitting in view of the configuration of the completely dry air terminal connection portion using the polymer sleeve 100. It has two conductive seal members with a conductive O-ring 191 disposed in a groove 164 on the lower end surface inside 160.

以下、上述のように構成されたポリマー套管100を用いた完全乾式の気中終端接続部について説明する。   In the following, a completely dry air terminal connection using the polymer cannula 100 configured as described above will be described.

絶縁筒120の大径絶縁筒121は、エポキシ樹脂等の硬質の絶縁体からなり、導体引出棒110と共に一体にモールドされ、気中終端接続部における下部ブッシング121Aを構成する。大径絶縁筒121の外面、すなわち下部ブッシング121Aの外面には銀ペイントなどの導電性塗料が塗布され導電層150が形成されている。下部ブッシング121Aは、遮蔽金具140のフランジ部143の下端面に取り付けられる下部金具160に収容される。   The large-diameter insulating cylinder 121 of the insulating cylinder 120 is made of a hard insulator such as an epoxy resin, and is molded integrally with the conductor lead-out rod 110 to form the lower bushing 121A in the air termination connection portion. A conductive layer 150 is formed on the outer surface of the large-diameter insulating cylinder 121, that is, the outer surface of the lower bushing 121A by applying a conductive paint such as silver paint. The lower bushing 121 </ b> A is accommodated in the lower metal fitting 160 attached to the lower end surface of the flange portion 143 of the shielding metal fitting 140.

下部ブッシング121Aの受容口190の開口部、すなわち下部金具160の底面に開口した開口部192は、ケーブル端末を接続しない場合には、耐食アルミ合金などからなるシール蓋193により密閉される。   When the cable terminal is not connected, the opening of the receiving port 190 of the lower bushing 121A, that is, the opening 192 opened at the bottom surface of the lower metal fitting 160 is sealed with a seal lid 193 made of a corrosion-resistant aluminum alloy or the like.

遮蔽金具140のフランジ部143の下端面には、環状の下部金具160が締付ボルト181を介して固定されている。また、フランジ部143の外周縁部の下端面は底部金具1の上面に当接され、締付ボルト182により固定される。   An annular lower metal fitting 160 is fixed to the lower end surface of the flange portion 143 of the shielding metal fitting 140 via a fastening bolt 181. Further, the lower end surface of the outer peripheral edge of the flange portion 143 is brought into contact with the upper surface of the bottom metal fitting 1 and is fixed by a fastening bolt 182.

下部金具160の固定フランジ部162の上端面は、遮蔽金具140のフランジ部143の外周縁部の下端面に締付ボルト181を介して固定される。   The upper end surface of the fixing flange portion 162 of the lower metal fitting 160 is fixed to the lower end surface of the outer peripheral edge portion of the flange portion 143 of the shielding metal fitting 140 via a fastening bolt 181.

下部ブッシング121Aは、シール蓋193を外し、電力ケーブルなどのケーブル端末(不図示)を取り付けることができる。ケーブル端末は、図示しないが段剥ぎされたケーブルの導体部分に圧縮され先端をチューリップコンタクト115に接続するための接続端子を有し、ポリマー套管100の受容口190に電界を緩和するためのゴム製のストレスコーンが装着される周知の構造である。   The lower bushing 121A can be attached with a cable terminal (not shown) such as a power cable by removing the seal lid 193. Although not shown, the cable terminal has a connection terminal for connecting the tip to the tulip contact 115 by being compressed by the conductor portion of the cable stripped off, and a rubber for relaxing the electric field at the receiving port 190 of the polymer sleeve 100. It is a well-known structure to which a made stress cone is attached.

以上詳細に説明したように、本実施の形態のポリマー套管100は、導電層150が形成された絶縁筒120の外周面に配設され、上端部が遮蔽金具140のフランジ部143の下端面に取付けられる環状の下部金具160と、下部金具160の上端部の内径角部に、導電層150が形成された絶縁筒120の外周面と遮蔽金具140のフランジ部143の下端面とに向かって開口する環状の溝部163と、溝部163に配設され、導電層150が形成された絶縁筒120の外周面と遮蔽金具140のフランジ部143の下端面との双方に密着する導電性Oリング170とを備える。   As described above in detail, the polymer cannula 100 of the present embodiment is disposed on the outer peripheral surface of the insulating cylinder 120 on which the conductive layer 150 is formed, and the upper end portion is the lower end surface of the flange portion 143 of the shielding metal fitting 140. An annular lower metal fitting 160 attached to the lower metal fitting 160, and an outer peripheral surface of the insulating cylinder 120 in which the conductive layer 150 is formed at an inner diameter corner portion of the upper end portion of the lower metal fitting 160 and a lower end surface of the flange portion 143 of the shielding metal fitting 140. An annular groove 163 that opens, and a conductive O-ring 170 that is disposed in the groove 163 and is in close contact with both the outer peripheral surface of the insulating cylinder 120 on which the conductive layer 150 is formed and the lower end surface of the flange 143 of the shielding metal fitting 140. With.

このため、使用中のヒートサイクルにより遮蔽金具140と導電層150とが離れることがあっても、導電層150が形成された大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面とは、導電性Oリング170を介して常に同電位に保たれ、導電性Oリング170により遮蔽金具140と導電層150との間が電気的に浮いた状態となることがなく、部分放電の発生を防止することができる。   For this reason, even if the shielding metal fitting 140 and the conductive layer 150 may be separated due to a heat cycle in use, the outer peripheral surface of the large-diameter insulating cylinder 121 on which the conductive layer 150 is formed and the flange portion 143 of the shielding metal fitting 140 are below. The end face is always kept at the same potential via the conductive O-ring 170, and the conductive O-ring 170 does not leave the shielding metal 140 and the conductive layer 150 in an electrically floating state. Can be prevented.

このように、下部金具160の上端部の内径角部に溝部163を形成し、この溝部163に導電性Oリング170を収納した本構成において初めて、導電層150が形成された大径絶縁筒121の外周面と遮蔽金具140のフランジ部143の下端面とが、常時、同電位に保たれ、安定した電気的接続が可能になる。   Thus, the groove 163 is formed in the inner diameter corner of the upper end of the lower metal fitting 160, and the large-diameter insulating cylinder 121 in which the conductive layer 150 is formed is the first in this configuration in which the conductive O-ring 170 is accommodated in the groove 163. The outer peripheral surface and the lower end surface of the flange portion 143 of the shielding metal fitting 140 are always kept at the same potential, and stable electrical connection is possible.

同時に、導電性Oリング170は、Oリングのシール機能として、遮蔽金具140のフランジ部143の下端面と下部金具160の固定フランジ部162の上端面との間の気密性及び、導電層150が形成された大径絶縁筒121の外周面と下部金具160の内周面との間の気密性を確保することができ、外部から内方中心への水の浸入をより確実に防止することができる。   At the same time, the conductive O-ring 170 has an air-tightness between the lower end surface of the flange portion 143 of the shielding metal fitting 140 and the upper end surface of the fixed flange portion 162 of the lower metal fitting 160 as a sealing function of the O-ring. Airtightness between the outer peripheral surface of the formed large-diameter insulating cylinder 121 and the inner peripheral surface of the lower metal fitting 160 can be ensured, and water can be more reliably prevented from entering the inner center from the outside. it can.

これに加えて、本実施の形態では、下部金具160内部に下部ブッシング121Aの底面部に形成された導電層150に密着する導電性シール部材としての導電性Oリング191が取付けられる。導電性Oリング191は、ケーブル端末側の気密性を確保するとともに、より確実に導電層150と下部金具160とを電気的に接触させることができる。   In addition, in this embodiment, a conductive O-ring 191 as a conductive seal member that is in close contact with the conductive layer 150 formed on the bottom surface of the lower bushing 121A is attached inside the lower metal fitting 160. The conductive O-ring 191 can ensure the airtightness on the cable end side and more reliably bring the conductive layer 150 and the lower metal fitting 160 into electrical contact with each other.

ところで、従来例においても、ダイレクトモールドの下部金具にはOリングが嵌め込まれ、下部金具はOリングを介して下部遮蔽金具(本実施の形態の遮蔽金具140に対応する)に接続されており、OリングとこのOリングを収納するための凹溝は、必須であった。本実施の形態では、導電性Oリング170が、従来例のOリングのシール機能を兼用している。このため、部材の追加は不要であり、低コストで実施が可能である。むしろ、下部金具160の上端部の内径角部に形成する溝部163は、従来例のOリングを収納するための凹溝より加工及び組立作業が容易であることから、より低コスト化が期待できる。   By the way, also in the conventional example, an O-ring is fitted into the lower fitting of the direct mold, and the lower fitting is connected to the lower shielding fitting (corresponding to the shielding fitting 140 of the present embodiment) via the O-ring, The O-ring and the concave groove for housing the O-ring were essential. In the present embodiment, the conductive O-ring 170 also serves as the sealing function of the conventional O-ring. For this reason, the addition of a member is unnecessary and implementation is possible at low cost. Rather, the groove 163 formed in the inner diameter corner of the upper end portion of the lower metal fitting 160 is easier to process and assemble than the concave groove for accommodating the O-ring of the conventional example. .

以上の説明は本発明の好適な実施の形態の例証であり、本発明の範囲はこれに限定されることはない。例えば、ポリマー套管及びケーブル終端接続部は、気中終端接続部に適用した例について説明しているが、ガス中終端接続部、油中終端接続部などに適用してもよい。すなわち、本発明は、導電層150が形成された絶縁筒120外周面に配設される下部金具160と遮蔽金具140との接続部分に特徴があるため、ポリマー被覆体130の有無には関係なく、ポリマー被覆体130を有さないポリマー套管であってもよい。   The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. For example, the polymer sleeve and the cable terminal connection part have been described as being applied to the air terminal connection part, but may be applied to a gas terminal connection part, an oil terminal connection part, and the like. That is, the present invention is characterized by the connecting portion between the lower metal fitting 160 and the shielding metal fitting 140 disposed on the outer peripheral surface of the insulating cylinder 120 on which the conductive layer 150 is formed. A polymer sleeve without the polymer coating 130 may be used.

上記実施の形態では、大径絶縁筒121と小径絶縁筒122からなる絶縁筒120について説明しているが、導体挿入孔110aと対応する部分を小径絶縁筒122と同様に細くした、いわゆる細径化した絶縁筒を使用してもよい。   In the above-described embodiment, the insulating cylinder 120 including the large-diameter insulating cylinder 121 and the small-diameter insulating cylinder 122 is described. However, the portion corresponding to the conductor insertion hole 110a is thinned similarly to the small-diameter insulating cylinder 122, so-called small diameter. An insulated tube may be used.

また、上記ポリマー套管及びケーブル終端接続部を構成する各部、例えば遮蔽金具、下部金具、導電性Oリング等の種類及び名称などは前述した実施の形態に限られない。   Further, the types and names of the parts constituting the polymer sleeve and the cable terminal connection part, such as shielding metal fittings, lower metal fittings, and conductive O-rings, are not limited to the above-described embodiments.

上記実施の形態では、導電性シール部材として導電性Oリングについて説明しているが、気密性、電気的接触の効果を得る限り、導電性パッキンを使用してもよい。   In the above-described embodiment, the conductive O-ring is described as the conductive seal member. However, a conductive packing may be used as long as the airtightness and the effect of electrical contact are obtained.

上記実施の形態では、導電層は導電性材料として銀ペイントなどの導電塗料を塗布した場合について説明しているが、導電性材料として金属蒸着などにより形成された導電層であってもよい。   In the above embodiment, the conductive layer has been described with respect to the case where a conductive paint such as silver paint is applied as the conductive material. However, the conductive layer may be a conductive layer formed by metal vapor deposition or the like as the conductive material.

また、上記実施の形態では、絶縁筒120はエポキシ樹脂、ポリマー被覆体130はシリコーンゴムの場合について説明しているが、絶縁筒120、ポリマー被覆体130を、エポキシ樹脂により一体的に形成したポリマー套管でもよい。   In the above embodiment, the insulating cylinder 120 is an epoxy resin and the polymer cover 130 is silicone rubber. However, the insulating cylinder 120 and the polymer cover 130 are integrally formed of an epoxy resin. A sleeve can be used.

また、上記実施の形態では、絶縁筒120下端部にケーブル端末の受容口190について説明しているが、本発明のポリマー套管は、特開2007−188735号公報や特開2007−26834号公報に記載されるような、当業者にとって既知である壁貫通ブッシングに適用してもよく、上記の「ケーブル端末の受容口190」に替えて、「ブッシングを接続するための受容口」を備えたポリマー套管でもよい。   Further, in the above-described embodiment, the cable end receiving port 190 is described at the lower end of the insulating cylinder 120. However, the polymer sleeve of the present invention is disclosed in JP-A-2007-188735 and JP-A-2007-26834. May be applied to a through-wall bushing known to those skilled in the art, as described above, and provided with a “receiving port for connecting the bushing” instead of the above “cable terminal receiving port 190” A polymer sleeve may be used.

さらに、上記実記の形態では、導体引出棒110下端部の導体挿入孔110aにおける導体接続方式は所謂チューリップコンタクト方式にて説明しているが、これに限定されず、ケーブル端末又はブッシングを絶縁筒の下端部の受容口に接続するいずれの場合も、例えばマルチラムバンドによる接続方式等の公知の導体接続方法でよい。   Furthermore, in the above-described embodiment, the conductor connection method in the conductor insertion hole 110a at the lower end portion of the conductor extraction rod 110 has been described by a so-called tulip contact method, but is not limited to this, and the cable terminal or bushing is connected to the insulating tube. In any case of connection to the receiving port at the lower end, a known conductor connection method such as a connection method using a multi-ram band may be used.

さらにまた、上記実施の形態では、導体引出棒110について説明しているが、絶縁筒110の先端部に、高電圧に接続される導体を有した構造であれば、例えば絶縁筒110内部の中心には導体が無い構造(すなわち、上記実施の形態で言えば、絶縁筒から突出した部分のみに高電圧に接続される導体がある構造)でもよい。   Furthermore, in the above embodiment, the conductor extraction rod 110 has been described. However, if the structure has a conductor connected to a high voltage at the tip of the insulating cylinder 110, for example, the center inside the insulating cylinder 110 May have a structure without a conductor (that is, a structure having a conductor connected to a high voltage only in a portion protruding from the insulating cylinder in the above embodiment).

本発明に係るポリマー套管及びケーブル終端接続部は、遮蔽金具と導電層を電気的に接続することができる効果を有し、電力ケーブルの気中終端接続部に用いられるポリマー套管として有用である。   The polymer cannula and the cable terminal connecting part according to the present invention have an effect of being able to electrically connect the shielding metal fitting and the conductive layer, and are useful as a polymer cannula used for the air terminal connecting part of the power cable. is there.

100 ポリマー套管
110 導体引出棒
120 絶縁筒
121 大径絶縁筒
121A 下部ブッシング
122 小径絶縁筒
130 ポリマー被覆体
140 遮蔽金具
141 筒状部
142 円筒部
143 フランジ部
150 導電層
160 下部金具
161 筒部
162 固定フランジ部
163,164 溝部
170,191 導電性Oリング
DESCRIPTION OF SYMBOLS 100 Polymer sleeve 110 Conductor extraction rod 120 Insulation cylinder 121 Large-diameter insulation cylinder 121A Lower bushing 122 Small-diameter insulation cylinder 130 Polymer covering 140 Shield metal fitting 141 Cylindrical part 142 Cylindrical part 143 Flange part 150 Conductive layer 160 Lower metal fitting 161 Cylindrical part 162 Fixed flange portion 163, 164 Groove portion 170, 191 Conductive O-ring

Claims (8)

高電圧に接続される導体を先端部に有する硬質の絶縁筒と、
前記絶縁筒に埋設される埋込部と該絶縁筒の周面から半径方向外方に突出したフランジ部とを有する遮蔽金具と、
前記遮蔽金具よりも下方部位の前記絶縁筒の外周面に導電性材料により形成された導電層と、
前記導電層が形成された前記絶縁筒の外周面に配設され、上端部が前記フランジ部の下端面に取付けられる環状の下部金具とを備えるポリマー套管であって、
前記下部金具の上端部の内径角部に、前記導電層が形成された前記絶縁筒の外周面と前記遮蔽金具の前記フランジ部の下端面とに向かって開口する環状の溝部と、
前記溝部に配設される導電性Oリングと、
を備えるポリマー套管。
A hard insulating cylinder having a conductor connected to a high voltage at the tip, and
A shielding fitting having an embedded portion embedded in the insulating tube and a flange portion protruding radially outward from the peripheral surface of the insulating tube;
A conductive layer formed of a conductive material on the outer peripheral surface of the insulating cylinder in a lower part than the shielding fitting;
A polymer sleeve provided with an annular lower fitting that is disposed on an outer peripheral surface of the insulating cylinder on which the conductive layer is formed, and whose upper end portion is attached to the lower end surface of the flange portion;
An annular groove that opens toward the outer peripheral surface of the insulating cylinder in which the conductive layer is formed and the lower end surface of the flange portion of the shielding metal fitting, at the inner diameter corner portion of the upper end portion of the lower metal fitting,
A conductive O-ring disposed in the groove;
A polymer sleeve comprising:
前記導電性Oリングは、前記導電層が形成された前記絶縁筒の外周面と前記遮蔽金具の前記フランジ部の下端面との双方に密着する請求項1記載のポリマー套管。   The polymer sleeve according to claim 1, wherein the conductive O-ring is in close contact with both an outer peripheral surface of the insulating tube on which the conductive layer is formed and a lower end surface of the flange portion of the shielding metal fitting. 前記溝部は、断面形状が断面L字形状に形成される請求項1又は2に記載のポリマー套管。   The polymer sleeve according to claim 1 or 2, wherein the groove portion is formed in an L-shaped cross section. 前記導電層は、前記絶縁筒の外周面から前記絶縁筒の下端面に延びて形成され、
前記下部金具内部の下端面には前記導電層と電気的に接触する導電性シール部材を備える請求項1乃至3のいずれか一項に記載のポリマー套管。
The conductive layer is formed to extend from the outer peripheral surface of the insulating tube to the lower end surface of the insulating tube,
The polymer sleeve according to any one of claims 1 to 3, further comprising a conductive seal member in electrical contact with the conductive layer at a lower end surface inside the lower metal fitting.
前記導体は、前記絶縁筒の中心に配設され、前記絶縁筒の先端部から突出される導体引出棒である請求項1乃至4のいずれか一項に記載のポリマー套管。   5. The polymer cannula according to claim 1, wherein the conductor is a conductor lead bar that is disposed at a center of the insulating cylinder and protrudes from a tip portion of the insulating cylinder. 前記絶縁筒の外周に、高分子絶縁材料により、それ自身の外周に複数の襞部が長手方向に離間して形成されたポリマー被覆体を備え、前記遮蔽金具は前記ポリマー被覆体の下方部位に設けられる請求項1乃至5のいずれか一項に記載のポリマー套管。   The outer periphery of the insulating cylinder is provided with a polymer covering body formed of a polymer insulating material, and a plurality of flanges are formed on the outer periphery of the insulating cylinder so as to be separated from each other in the longitudinal direction. The polymer cannula according to any one of claims 1 to 5, which is provided. 前記絶縁筒の下端部にケーブル端末又はブッシングを接続するための受容口を有する請求項1乃至6のいずれか一項に記載のポリマー套管。   The polymer sleeve according to any one of claims 1 to 6, further comprising a receiving port for connecting a cable end or a bushing to a lower end portion of the insulating cylinder. 請求項1乃至6のいずれか一項に記載のポリマー套管の前記絶縁筒の下端部にはケーブル端末の受容口を有し、ケーブル端末の受容口に、ケーブル端末が装着されているケーブル終端接続部。
A cable end having a cable terminal receiving port at a lower end portion of the insulating tube of the polymer sleeve according to any one of claims 1 to 6, wherein the cable terminal is mounted in the cable terminal receiving port. Connection part.
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