JP2013046549A - Plug-in bushing and dielectric strength test method - Google Patents

Plug-in bushing and dielectric strength test method Download PDF

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JP2013046549A
JP2013046549A JP2011184756A JP2011184756A JP2013046549A JP 2013046549 A JP2013046549 A JP 2013046549A JP 2011184756 A JP2011184756 A JP 2011184756A JP 2011184756 A JP2011184756 A JP 2011184756A JP 2013046549 A JP2013046549 A JP 2013046549A
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plug
bushing
conductor
cable head
peripheral surface
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JP5414754B2 (en
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Susumu Imanishi
晋 今西
Nobuyuki Sema
信幸 瀬間
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SWCC Corp
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SWCC Showa Cable Systems Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/16—Construction of testing vessels; Electrodes therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/38—Fittings, e.g. caps; Fastenings therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/50—Insulators or insulating bodies characterised by their form with surfaces specially treated for preserving insulating properties, e.g. for protection against moisture, dirt, or the like
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Cable Accessories (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a plug-in bushing and a dielectric strength test method which reduce spaces and improve the work efficiency when electricity is applied to an apparatus for electric power including a cable head that may make a plug-in type connection with an electric power cable terminal.SOLUTION: A plug-in bushing includes: a bar shaped internal conductor; an epoxy bushing formed at an outer peripheral surface of the internal conductor so that both ends of the internal conductor are exposed; a first insulation reinforcement part formed at an in-air side outer peripheral surface of the epoxy bushing; a second insulation reinforcement part formed at a terminal connection side outer peripheral surface of the epoxy bushing; a compression apparatus pressing the second insulation reinforcement part against a cable head; and a conductor plug which is connected with a terminal connection side tip of the internal conductor and electrically connects the internal conductor with a terminal connection structure. Further, an electric field relaxation part of the first insulation reinforcement part and a conductive part of the second insulation reinforcement part are electrically connected with a conductive layer formed at the outer peripheral surface of the epoxy bushing.

Description

本発明は、ガス絶縁開閉装置（ＧＩＳ：Gas Insulated Switch）や変圧器等の電力用機器に課電するためのプラグインブッシング及びこれを用いた耐電圧試験方法に関する。   The present invention relates to a plug-in bushing for applying electric power to a power device such as a gas insulated switchgear (GIS: Gas Insulated Switch) or a transformer, and a withstand voltage test method using the plug-in bushing.

一般に、受変電設備に用いられる電力用機器として、六フッ化硫黄（ＳＦ6）等の絶縁ガスを封入した接地容器内に、遮断器、断路器、母線電線路、避雷器等を収容したガス絶縁開閉装置や、巻線及び鉄心等を収容したケース内に絶縁媒体としての六フッ化イオウ（ＳＦ6）ガス等の絶縁ガスまたは油を封入した変圧器が知られている。ガス絶縁開閉装置や変圧器等の電力用機器を現地に設置する際には、耐電圧試験が行われ、使用に耐える絶縁耐力を保持しているか確認される。 In general, as a power device used in power receiving / transforming equipment, gas insulation containing a circuit breaker, disconnector, bus line, lightning arrester, etc. in a grounded container filled with an insulating gas such as sulfur hexafluoride (SF 6 ) 2. Description of the Related Art A transformer in which an insulating gas or oil such as sulfur hexafluoride (SF6) gas as an insulating medium is enclosed in a case accommodating a switchgear, a winding, an iron core and the like is known. When installing power equipment such as gas-insulated switchgears and transformers in the field, a withstand voltage test is conducted to confirm that the dielectric strength that can withstand use is maintained.

従来、ガス絶縁開閉装置や変圧器等の電力用機器の耐電圧試験は、例えば気中絶縁構造を有する試験用ブッシングを、一端側がガス絶縁された機器内、他端側が気中となるように取り付け、気中側から課電することにより行われている（例えば特許文献１の第１図）。
また、プラグイン式の電力ケーブル端末を電力用機器に接続して行う電力用機器の耐電圧試験は、例えば試験用リードケーブルの一端側に設けられた終端コネクタを機器に接続し、他端側に設けられた気中終端接続部から課電することにより行われている（例えば特許文献２）。 Conventionally, withstand voltage tests for power equipment such as gas-insulated switchgears and transformers, for example, a test bushing having an air-insulated structure is used so that one end is gas-insulated and the other end is in the air. This is done by attaching and applying power from the air side (for example, FIG. 1 of Patent Document 1).
In addition, the withstand voltage test of the power device performed by connecting the plug-in type power cable terminal to the power device is performed by connecting a terminal connector provided on one end side of the test lead cable to the device and connecting the other end side to the device, for example. (For example, patent document 2).

特開昭５９−４７９０７号公報JP 59-47907 特開平７−２７０４８４号公報JP 7-270484 A

しかしながら、特許文献１の第１図に記載の手法では、課電する気中側のスペースは小さくて済むものの、試験用ブッシングの取り付けや分解に際し、ガス絶縁開閉装置の内部空間が大気に開放されてしまうため、その都度絶縁ガスを再封入する必要がある。そのため、多大な労力や作業時間を要することとなり、作業効率が悪い。変圧器の場合も同様である。   However, in the method described in FIG. 1 of Patent Document 1, the space on the air side to be charged is small, but when the test bushing is attached or disassembled, the internal space of the gas insulated switchgear is opened to the atmosphere. Therefore, it is necessary to refill the insulating gas each time. Therefore, a great deal of labor and work time are required, and work efficiency is poor. The same applies to transformers.

一方、特許文献２に記載の手法によれば、電力用機器にプラグイン式で試験用リードケーブルを接続できるので、絶縁ガスの再封入処理を行わなくて済むという利点がある。しかしながら、電力用機器の耐電圧試験の際に、試験用リードケーブルを配置し、比較的大型の終端接続部を設置するため、広いスペースを確保する必要がある。試験用リードケーブルに設けられる気中終端接続部を、熱収縮チューブを利用した簡易タイプのものに代えることも行われているが、この場合もやはり試験用リードケーブルの曲げ半径を考慮して、その分のスペースを確保する必要がある。   On the other hand, according to the technique described in Patent Document 2, since a test lead cable can be connected to a power device in a plug-in manner, there is an advantage that it is not necessary to re-enclose the insulating gas. However, when conducting a withstand voltage test for power equipment, a test lead cable is arranged and a relatively large terminal connection portion is installed, so that it is necessary to secure a wide space. The air termination connection provided in the test lead cable is also replaced with a simple type using a heat shrinkable tube, but in this case as well, considering the bending radius of the test lead cable, It is necessary to secure that much space.

本発明は、上記課題を解決するためになされたもので、ガス絶縁開閉装置や変圧器等の電力用機器に対して課電する際の省スペース化、及び作業効率の向上を図ることができるプラグインブッシング及び耐電圧試験方法を提供することを目的とする。   The present invention has been made to solve the above-described problems, and can save space and improve work efficiency when applying power to a power device such as a gas-insulated switchgear or a transformer. An object is to provide a plug-in bushing and a withstand voltage test method.

本発明に係るプラグインブッシングは、電力ケーブル端末をプラグイン式で接続可能なケーブルヘッドを備えた電力用機器に課電するためのプラグインブッシングであって、
棒状の内部導体と、
前記内部導体の外周面に、前記内部導体の両端が露出するように形成されるエポキシブッシングと、
前記エポキシブッシングの気中側の外周面に形成される第１の絶縁補強部と、
前記エポキシブッシングの終端接続側の外周面に形成される第２の絶縁補強部と、
前記第２の絶縁補強部を前記ケーブルヘッドに対して押圧する圧縮装置と、
前記内部導体の終端接続側の先端に接続され、前記内部導体と前記ケーブルヘッドを電気的に接続させる導体プラグと、を備え、
前記第１の絶縁補強部は、絶縁部と電界緩和部を有し、
前記第２の絶縁補強部は、絶縁ゴム部と導電部を有し、
前記電界緩和部と前記導電部は、それぞれ前記エポキシブッシングの外周面に形成される導電層と電気的に接続されていることを特徴とする。 The plug-in bushing according to the present invention is a plug-in bushing for applying power to a power device having a cable head capable of connecting a power cable terminal in a plug-in manner,
A rod-shaped inner conductor;
An epoxy bushing formed on the outer peripheral surface of the inner conductor so as to expose both ends of the inner conductor;
A first insulation reinforcing portion formed on the outer peripheral surface of the epoxy bushing on the air side;
A second insulation reinforcing portion formed on the outer peripheral surface on the terminal connection side of the epoxy bushing;
A compression device for pressing the second insulation reinforcing portion against the cable head;
A conductor plug connected to the end of the inner conductor on the terminal connection side, and electrically connecting the inner conductor and the cable head; and
The first insulation reinforcing part has an insulating part and an electric field relaxation part,
The second insulation reinforcing portion has an insulating rubber portion and a conductive portion,
The electric field relaxation portion and the conductive portion are each electrically connected to a conductive layer formed on an outer peripheral surface of the epoxy bushing.

ここで、プラグインブッシングにおいて、後述するフランジ部を境に、電力用機器のケーブルヘッドに装着する側を「終端接続側」といい、電圧を印加する側を「気中側」という。   Here, in the plug-in bushing, the side to be attached to the cable head of the power device with the flange portion described later as the boundary is referred to as “termination connection side”, and the side to which the voltage is applied is referred to as “air side”.

本発明に係る耐電圧試験方法は、上記プラグインブッシングを前記ケーブルヘッドに取り付けて、前記電力用機器に課電することを特徴とする。   The withstand voltage test method according to the present invention is characterized in that the plug-in bushing is attached to the cable head and applied to the power device.

本発明に係るプラグインブッシングによれば、ガス絶縁開閉装置や変圧器等の電力用機器に課電する際、課電用に電力ケーブルを用いる必要はないので、省スペース化が図られる。また、ガス絶縁開閉装置等の絶縁ガスが封入された電力用機器にプラグイン式で接続できるので、取付作業が極めて容易であり、絶縁ガスの再封入処理も不要となる。したがって、本発明に係るプラグインブッシングによれば、ガス絶縁開閉装置等の電力用機器に対して課電する際の省スペース化、及び作業効率の向上を図ることができる。
また、本発明に係る耐電圧試験方法によれば、電力用機器に課電するためのプラグインブッシングの取付・解体作業が改善されるので、格段に作業効率が向上する。 According to the plug-in bushing according to the present invention, when power is applied to a power device such as a gas-insulated switchgear or a transformer, it is not necessary to use a power cable for power application, so that space saving is achieved. In addition, since it can be connected to a power device filled with an insulating gas such as a gas-insulated switchgear by a plug-in method, the mounting operation is extremely easy, and the refilling process of the insulating gas is not required. Therefore, according to the plug-in bushing according to the present invention, it is possible to save space and improve work efficiency when applying power to a power device such as a gas insulated switchgear.
In addition, according to the withstand voltage test method of the present invention, the work of attaching and dismantling the plug-in bushing for applying power to the power equipment is improved, so the work efficiency is remarkably improved.

実施の形態に係るプラグインブッシングを接続可能な電力用機器を示す図である。It is a figure which shows the apparatus for electric power which can connect the plug-in bushing which concerns on embodiment. 電力用機器に取り付けられたケーブルヘッドの拡大図である。It is an enlarged view of the cable head attached to the apparatus for electric power. 第１の実施の形態に係るプラグインブッシングを示す図である。It is a figure which shows the plug-in bushing which concerns on 1st Embodiment. 第１の実施の形態に係るプラグインブッシングの終端接続側の拡大図である。It is an enlarged view at the terminal end connection side of the plug-in bushing according to the first embodiment. 第１の実施の形態のプラグインブッシングとケーブルヘッドの接続状態を示す図である。It is a figure which shows the connection state of the plug-in bushing and cable head of 1st Embodiment. 第１の実施の形態のプラグインブッシングとケーブルヘッドの接続部の拡大図である。It is an enlarged view of the connection part of the plug-in bushing and cable head of 1st Embodiment. 第２の実施の形態に係るプラグインブッシングを示す図である。It is a figure which shows the plug-in bushing which concerns on 2nd Embodiment.

以下、本発明の実施の形態を図面に基づいて詳細に説明する。
［第１の実施の形態］
図１は本実施の形態に係るプラグインブッシングを接続可能な電力用機器を示す図であり、図２は電力用機器に取り付けられたケーブルヘッドの拡大図である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is a view showing a power device to which a plug-in bushing according to the present embodiment can be connected, and FIG. 2 is an enlarged view of a cable head attached to the power device.

図１に示すように、電力用機器１００は、例えばＳＦ6等の絶縁ガスを封入した接地容器１０１内に、遮断器３１、断路器３２、母線電線路３３等の充電部３を収容したガス絶縁開閉装置である。電力用機器１００は、充電部３を収容する機器収容部１００Ａと、充電部３に課電するための電力ケーブル（図示略）を接続するエレファント部１００Ｂを備える。
エレファント部１００Ｂにはケーブルヘッド２が設けられ、このケーブルヘッド２に対応する終端処理が施された電力ケーブル端末をプラグイン式で接続できるようになっている。電力用機器１００の通常運転時は、ケーブルヘッド２に電力ケーブル端末が接続された状態で使用される。 As shown in FIG. 1, the power device 100 is a gas in which a charging unit 3 such as a circuit breaker 31, a disconnector 32, a bus line 33, etc. is contained in a grounded container 101 filled with an insulating gas such as SF 6. Insulated switchgear. The power device 100 includes a device housing unit 100A that houses the charging unit 3 and an elephant unit 100B that connects a power cable (not shown) for applying power to the charging unit 3.
The elephant unit 100B is provided with a cable head 2, and a power cable terminal subjected to termination processing corresponding to the cable head 2 can be connected in a plug-in manner. During normal operation of the power device 100, the power cable terminal is connected to the cable head 2.

図２に示すように、ケーブルヘッド２は、機器側ブッシング２１、機器側導体２２等を備える。
機器側ブッシング２１は、例えばエポキシ樹脂等の硬質の絶縁体で構成された中空状の成形体である。機器側ブッシング２１は、本実施の形態では、円筒状の頭部２１ａ、釣鐘状の胴部２１ｂ、表面に導電塗料が塗布され、先端側にベルマウス状の凹部を有する遮蔽部２１ｃ、径方向外側に突出するフランジ状の機器固定部２１ｄ、及び絶縁筒部２１ｅを有する。なお、機器側ブッシング２１の形状はこれに限定されない。 As shown in FIG. 2, the cable head 2 includes a device-side bushing 21, a device-side conductor 22, and the like.
The device-side bushing 21 is a hollow molded body made of a hard insulator such as an epoxy resin. In this embodiment, the device-side bushing 21 includes a cylindrical head portion 21a, a bell-shaped body portion 21b, a conductive coating applied to the surface, and a shielding portion 21c having a bell mouth-like recess on the tip side, and a radial direction. It has a flange-shaped device fixing part 21d and an insulating cylinder part 21e protruding outward. In addition, the shape of the apparatus side bushing 21 is not limited to this.

機器固定部２１ｄは、接地容器１０１の開口１０１ａに係止されるように、開口１０１ａの口径よりも大きく形成される。また、遮蔽部２１ｃから機器固定部２１ｄのボルト挿入側にかけての外表面には導電塗料が塗布され、導電層（図示略）が形成される。この導電層と接地容器１０１が当接することにより、遮蔽部２１ｃの外表面が接地電位となる。
絶縁筒部２１ｅは、機器固定部２１ｄの後端側に連設される。絶縁筒部２１ｅの外周面には導電層が設けられていないため、絶縁筒部２１ｅによって、電力用機器の接地容器１０１側の接地とケーブルヘッド２に接続されるプラグインブッシング１側の接地は縁切りされる。 The device fixing portion 21d is formed larger than the diameter of the opening 101a so as to be locked to the opening 101a of the ground container 101. In addition, a conductive paint is applied to the outer surface from the shielding portion 21c to the bolt insertion side of the device fixing portion 21d to form a conductive layer (not shown). When the conductive layer comes into contact with the ground container 101, the outer surface of the shielding portion 21c becomes a ground potential.
The insulating cylinder portion 21e is connected to the rear end side of the device fixing portion 21d. Since the conductive layer is not provided on the outer peripheral surface of the insulating cylinder portion 21e, the insulating cylinder portion 21e prevents the grounding on the grounding container 101 side of the power equipment and the grounding on the plug-in bushing 1 side connected to the cable head 2. It is cut off.

機器側ブッシング２１は、開口１０１ａを介して接地容器１０１の内部に挿入される。接地容器１０１又は機器固定部２１ｄの当接面には、環状の凹溝（図示略）を形成し、この凹溝にＯリングやパッキン等のシール部材（図示略）が配置される。この状態で、機器固定部２１ｄを接地容器１０１に複数のボルトで締め付けることにより、機器側ブッシング２１は接地容器１０１に気密に固定される。すなわち、接地容器１０１に封入されている絶縁ガスが、開口１０１ａから外部に漏れ出さない構造となっている。   The device-side bushing 21 is inserted into the ground container 101 through the opening 101a. An annular groove (not shown) is formed on the contact surface of the ground container 101 or the device fixing portion 21d, and a seal member (not shown) such as an O-ring or packing is disposed in the groove. In this state, the device-side bushing 21 is airtightly fixed to the ground container 101 by fastening the device fixing portion 21d to the ground container 101 with a plurality of bolts. That is, the structure is such that the insulating gas sealed in the ground container 101 does not leak out from the opening 101a.

機器側導体２２は、銅、銅合金、アルミニウム、又はアルミニウム合金等の通電に適した金属製の部材である。機器側導体２２は、モールド成形により機器側ブッシング２１と一体的に形成される。
機器側導体２２は、機器側ブッシング２１の頂部２１ｇから突出する導体引出部２２ａ、機器側ブッシング２１の頭部２１ａの内周面に埋設された円筒部２２ｂ、導体引出部２２ａと円筒部２２ｂを連結する首部２２ｃ、首部２２ｃから機器側ブッシング２１の受容口２１ｆに向けて突出する係止部２２ｄを有する。 The device-side conductor 22 is a metal member suitable for energization such as copper, copper alloy, aluminum, or aluminum alloy. The device side conductor 22 is formed integrally with the device side bushing 21 by molding.
The device-side conductor 22 includes a conductor lead-out portion 22a protruding from the top portion 21g of the device-side bushing 21, a cylindrical portion 22b embedded in the inner peripheral surface of the head portion 21a of the device-side bushing 21, and the conductor lead-out portion 22a and the cylindrical portion 22b. The neck portion 22c to be connected and the locking portion 22d protruding from the neck portion 22c toward the receiving port 21f of the device side bushing 21 are provided.

導体引出部２２ａは、接地容器１０１内で機器側の高電圧導体（図示略）を介して充電部３に電気的に接続される。
係止部２２ｄには、導電性のリング状接触子２３（いわゆるチューリップコンタクト）の一端側が係止される。このリング状接触子２３の他端側には、電力ケーブルに接続された導体接続端子（図示略）が係止されるか又はプラグインブッシング１の後述の導体プラグ１６が挿入される。機器側導体２２は、リング状接触子２３を介してプラグインブッシング１と電気的に接続されることとなる。 The conductor lead-out part 22a is electrically connected to the charging part 3 via a high-voltage conductor (not shown) on the device side in the ground container 101.
One end side of a conductive ring contact 23 (so-called tulip contact) is locked to the locking portion 22d. On the other end side of the ring-shaped contact 23, a conductor connection terminal (not shown) connected to the power cable is locked, or a later-described conductor plug 16 of the plug-in bushing 1 is inserted. The device-side conductor 22 is electrically connected to the plug-in bushing 1 via the ring-shaped contact 23.

このように、電力用機器１００は、電力ケーブルをプラグイン式で接続可能なケーブルヘッド２を備えている。また、ケーブルヘッド２は、プラグインブッシング１の終端接続側を挿入可能な機器側ブッシング２１と、導体プラグ１６と電気的に接続される機器側導体２２と、一端が機器側導体２２に接続され、他端が導体プラグ１６に接続されるリング状接触子２３とを備えている。   As described above, the power device 100 includes the cable head 2 to which a power cable can be connected in a plug-in manner. The cable head 2 has a device-side bushing 21 into which the terminal connection side of the plug-in bushing 1 can be inserted, a device-side conductor 22 electrically connected to the conductor plug 16, and one end connected to the device-side conductor 22. The ring contact 23 is connected to the conductor plug 16 at the other end.

電力用機器１００を現地に設置する際には、耐電圧試験が行われ、使用に耐える絶縁耐力を保持しているか確認される。この耐電圧試験を行う際に、本実施の形態に係るプラグインブッシング１が用いられる。
なお、エレファント部１００Ｂは、天地が逆転できるように回動可能に構成される。すなわち、通常時は電力ケーブルとの接続状態の安定性が確保されるように下方にケーブルヘッド２が位置する状態とされ（図１参照）、耐電圧試験時には作業性が向上するように上方にケーブルヘッド２が位置する状態とされる（図５参照）。 When the power device 100 is installed on the site, a withstand voltage test is performed to check whether the dielectric strength that can withstand use is maintained. When performing this withstand voltage test, the plug-in bushing 1 according to the present embodiment is used.
In addition, the elephant part 100B is configured to be rotatable so that the top and bottom can be reversed. In other words, the cable head 2 is positioned below so as to ensure the stability of the connection state with the power cable during normal operation (see FIG. 1), and upward so as to improve workability during the withstand voltage test. The cable head 2 is positioned (see FIG. 5).

図３は本実施の形態に係るプラグインブッシング１を示す図で、図４はプラグインブッシング１の終端接続側の拡大図である。このプラグインブッシング１は、電力ケーブルをプラグイン式で接続可能なケーブルヘッド２を備えた電力用機器１００（図１参照）の耐電圧試験を行う際に、電力用機器１００のケーブルヘッド２に装着して課電するためのものである。   FIG. 3 is a diagram showing the plug-in bushing 1 according to the present embodiment, and FIG. 4 is an enlarged view of the plug-in bushing 1 on the terminal connection side. The plug-in bushing 1 is provided on the cable head 2 of the power device 100 when performing a withstand voltage test on the power device 100 (see FIG. 1) including the cable head 2 to which a power cable can be connected in a plug-in manner. It is for attaching and charging electricity.

説明の便宜上、プラグインブッシング１において、フランジ部１２２を境に、電力用機器１００のケーブルヘッド２に装着する側を「終端接続側」と称し、電圧を印加する側を「気中側」と称する。また、以下の説明において、ケーブルヘッド２に挿入する側（図３では下方）を「先端側」、反対側（図３では上方）を「後端側」と称することもある。   For convenience of explanation, in the plug-in bushing 1, the side to be attached to the cable head 2 of the power device 100 with the flange portion 122 as a boundary is referred to as “termination connection side”, and the side to which voltage is applied is referred to as “air side”. Called. Further, in the following description, the side (downward in FIG. 3) to be inserted into the cable head 2 may be referred to as “front end side”, and the opposite side (upward in FIG.

図３に示すように、プラグインブッシング１は、内部導体１１、エポキシブッシング１２、第１の絶縁補強部１３、第２の絶縁補強部１４、圧縮装置１５、導体プラグ１６等を備える。   As shown in FIG. 3, the plug-in bushing 1 includes an inner conductor 11, an epoxy bushing 12, a first insulating reinforcing portion 13, a second insulating reinforcing portion 14, a compression device 15, a conductor plug 16, and the like.

内部導体１１は、銅、銅合金、アルミニウム、又はアルミニウム合金等の通電に適した金属製の棒状部材である。内部導体１１の先端（終端接続側）には導体プラグ１６が接続され、後端（気中側）には電圧を印加するためのリード線が接続される。   The inner conductor 11 is a metal rod-shaped member suitable for energization such as copper, copper alloy, aluminum, or aluminum alloy. A conductor plug 16 is connected to the front end (terminal connection side) of the internal conductor 11, and a lead wire for applying a voltage is connected to the rear end (air side).

エポキシブッシング１２は、エポキシ樹脂で構成され、両端から内部導体１１が露出するように、モールド成形により内部導体１１の外周面に形成される。エポキシブッシング１２の終端接続側と気中側の間には、終端接続側及び気中側よりも外径が大きいフランジ部１２２が形成される。エポキシブッシング１２の気中側の外周面に第１の絶縁補強部１３が形成され、終端接続側の外周面に第２の絶縁補強部１４が形成される。
また、エポキシブッシング１２において、第１の絶縁補強部１３の先端部１３ａから第２の絶縁補強部１４の後端部１４ａにわたる外周面には、例えば導電塗料を塗布することにより導電層１２１が形成される。なお、図３及び図４では、説明の便宜上、導電層１２１を表す破線を、エポキシブッシング１２の外周線より内側に記載している。導電層１２１を接地電位とすることにより、エポキシブッシング１２の遮蔽層が形成される。 The epoxy bushing 12 is made of an epoxy resin and is formed on the outer peripheral surface of the internal conductor 11 by molding so that the internal conductor 11 is exposed from both ends. Between the terminal connection side and the air side of the epoxy bushing 12, a flange portion 122 having a larger outer diameter than the terminal connection side and the air side is formed. A first insulation reinforcing portion 13 is formed on the outer peripheral surface of the epoxy bushing 12 in the air, and a second insulating reinforcing portion 14 is formed on the outer peripheral surface of the terminal connection side.
Further, in the epoxy bushing 12, a conductive layer 121 is formed on the outer peripheral surface extending from the front end portion 13a of the first insulating reinforcing portion 13 to the rear end portion 14a of the second insulating reinforcing portion 14 by applying a conductive paint, for example. Is done. 3 and 4, the broken line representing the conductive layer 121 is shown inside the outer peripheral line of the epoxy bushing 12 for convenience of explanation. The shielding layer of the epoxy bushing 12 is formed by setting the conductive layer 121 to the ground potential.

この導電層１２１の気中側の端部は、第１の絶縁補強部１３の電極１３２の先端側と接触し、緩やかな傾斜を有する電極立ち上り部１３２ａを形成する。この傾斜により、導電層１２１の気中側の端部に集中する電界が緩和される。また、導電層１２１の終端接続側の端部は、第２の絶縁補強部１４の導電部１４２と接触し、緩やかな傾斜を有する立ち上がり部を形成する。この傾斜により、導電層１２１の終端接続側の端部に集中する電界が緩和される。
なお、本実施の形態では、第１の絶縁補強部１３の先端部１３ａから第２の絶縁補強部１４の後端部１４ａにわたる外周面に導電層１２１を形成しているが、必要に応じて、導電層１２１を中間で切り離し、終端接続側の接地層と気中側の接地層を電気的に切り離すための縁切り部を設けてもよい。 The air-side end portion of the conductive layer 121 is in contact with the tip end side of the electrode 132 of the first insulation reinforcing portion 13 to form an electrode rising portion 132a having a gentle slope. By this inclination, the electric field concentrated on the air-side end of the conductive layer 121 is relaxed. The end of the conductive layer 121 on the terminal connection side is in contact with the conductive portion 142 of the second insulation reinforcing portion 14 to form a rising portion having a gentle slope. By this inclination, the electric field concentrated on the end of the conductive layer 121 on the terminal connection side is relaxed.
In the present embodiment, the conductive layer 121 is formed on the outer peripheral surface extending from the front end portion 13a of the first insulating reinforcing portion 13 to the rear end portion 14a of the second insulating reinforcing portion 14, but as necessary. The conductive layer 121 may be separated in the middle, and an edge cut portion for electrically separating the ground connection layer on the terminal connection side and the ground layer on the air side may be provided.

第１の絶縁補強部１３は、全体として紡錘状に形成されたコンデンサコーンであり、エポキシブッシング１２の気中側に挿嵌される。第１の絶縁補強部１３は、絶縁部１３１と、複数の筒状の電極１３２を備える。具体的には、電極１３２の先端側から中央部は、電極立ち上がり部１３２ａを含む外径が最も大きい筒状の電極で構成され、中央部から後端側は、後端側に向かって、順次縮径する複数の円筒状の電極で構成される。絶縁部１３１は、エチレンプロピレンゴム（ＥＰゴム）、シリコーンゴム等の絶縁性ゴム材料で構成される。電極１３２は、絶縁性ゴム材料にカーボンブラック等を混入して導電性を付与した導電性ゴム材料で構成される。この電極１３２が、第１の絶縁補強部１３の電界緩和部となる。   The first insulation reinforcing portion 13 is a condenser cone formed in a spindle shape as a whole, and is inserted into the air side of the epoxy bushing 12. The first insulation reinforcing portion 13 includes an insulating portion 131 and a plurality of cylindrical electrodes 132. Specifically, the center portion from the front end side of the electrode 132 is configured by a cylindrical electrode having the largest outer diameter including the electrode rising portion 132a, and the rear end side from the center portion sequentially toward the rear end side. It is composed of a plurality of cylindrical electrodes with a reduced diameter. The insulating part 131 is made of an insulating rubber material such as ethylene propylene rubber (EP rubber) or silicone rubber. The electrode 132 is made of a conductive rubber material in which carbon black or the like is mixed into an insulating rubber material to provide conductivity. This electrode 132 becomes an electric field relaxation part of the first insulation reinforcing part 13.

電極１３２は、隣接する電極が接触しないで長手方向に一部オーバーラップするように、絶縁部１３１中に埋設される。また、電極１３２の先端側（外径が最も大きい筒状の電極の先端側）は、エポキシブッシング１２に形成された導電層１２１の気中側端部に接触するように導電層１２１の外周に配置される。これにより、電極１３２のうち、外径が最も大きい筒状の電極が接地電位となり、残りの複数の円筒状の電極が電圧分担し、コンデンサとして機能する。第１の絶縁補強部１３（コンデンサコーン）によって、気中側における電界の局部的な集中が緩和される。
なお、エポキシブッシング１２と、コンデンサを形成する円筒状の電極との相対位置や、電極の枚数は本実施の形態に限定されず、適宜変更することができる。 The electrode 132 is embedded in the insulating part 131 so that adjacent electrodes do not contact each other and partially overlap in the longitudinal direction. The tip end side of the electrode 132 (the tip end side of the cylindrical electrode having the largest outer diameter) is on the outer periphery of the conductive layer 121 so as to contact the air-side end portion of the conductive layer 121 formed on the epoxy bushing 12. Be placed. Thereby, among the electrodes 132, the cylindrical electrode having the largest outer diameter becomes the ground potential, and the remaining plurality of cylindrical electrodes share the voltage and function as a capacitor. The local concentration of the electric field on the air side is alleviated by the first insulation reinforcing portion 13 (capacitor cone).
The relative position between the epoxy bushing 12 and the cylindrical electrode forming the capacitor and the number of electrodes are not limited to this embodiment, and can be changed as appropriate.

第２の絶縁補強部１４は、全体として紡錘状に形成された、エチレンプロピレンゴム（ＥＰゴム）、シリコーンゴム等から成るゴム製のストレスコーンであり、エポキシブッシング１２の終端接続側に挿嵌される。第２の絶縁補強部１４は、絶縁性ゴム材料で構成される先端側の絶縁ゴム部１４１と、後端側の導電部１４２を備える。ここでは、導電部１４２は導電性ゴム材料で構成され、モールド成形により絶縁ゴム部１４１と一体的に形成される。なお、導電部１４２は導電性ゴム材料で形成する必要はなく、例えば、絶縁性ゴム材料の表面に導電性塗料を塗布することで導電部１４２を形成してもよい。
絶縁ゴム部１４１と導電部１４２は、一体的に形成される。また、導電部１４２は、ベルマウス状に形成され、エポキシブッシング１２に形成された導電層１２１に接続される。第２の絶縁補強部１４によって、終端接続側における電界の局部的な集中が緩和される。
第２の絶縁補強部１４の絶縁ゴム部１４１の外周は、装着されるケーブルヘッド２の受容口２１ｆに対応する形状となっており、圧縮装置１５によりケーブルヘッド２の受容口２１ｆに押圧される。 The second insulation reinforcing portion 14 is a rubber stress cone made of ethylene propylene rubber (EP rubber), silicone rubber or the like, which is formed in a spindle shape as a whole, and is inserted into the terminal connection side of the epoxy bushing 12. The The second insulation reinforcing part 14 includes an insulating rubber part 141 on the front end side made of an insulating rubber material and a conductive part 142 on the rear end side. Here, the conductive portion 142 is made of a conductive rubber material, and is formed integrally with the insulating rubber portion 141 by molding. The conductive portion 142 need not be formed of a conductive rubber material. For example, the conductive portion 142 may be formed by applying a conductive paint on the surface of an insulating rubber material.
The insulating rubber part 141 and the conductive part 142 are integrally formed. Further, the conductive portion 142 is formed in a bell mouth shape and is connected to the conductive layer 121 formed on the epoxy bushing 12. The second insulation reinforcing portion 14 reduces local concentration of the electric field on the terminal connection side.
The outer periphery of the insulating rubber portion 141 of the second insulation reinforcing portion 14 has a shape corresponding to the receiving port 21f of the cable head 2 to be attached, and is pressed against the receiving port 21f of the cable head 2 by the compression device 15. .

圧縮装置１５は、押し金具１５１、スプリング１５２、及び押し金具フランジ１５３等を備える。圧縮装置１５は、固定金具４１によってエポキシブッシング１２に固定される。
押し金具１５１の先端側の開口１５１ａは、第２の絶縁補強部１４の後端側の外周面（導電部１４２の外周面）に沿ってラッパ状に形成される。押し金具１５１の後端部１５１ｂには、スプリング収容部１５１ｃが円周方向に沿って複数形成される。これらのスプリング収容部１５１ｃに、それぞれコイル状のスプリング１５２が装着される。 The compression device 15 includes a pressing metal 151, a spring 152, a pressing metal flange 153, and the like. The compression device 15 is fixed to the epoxy bushing 12 by a fixing bracket 41.
The opening 151 a on the front end side of the pressing metal 151 is formed in a trumpet shape along the outer peripheral surface (the outer peripheral surface of the conductive portion 142) on the rear end side of the second insulating reinforcing portion 14. A plurality of spring accommodating portions 151c are formed in the rear end portion 151b of the pressing metal 151 along the circumferential direction. Coiled springs 152 are respectively attached to these spring accommodating portions 151c.

押し金具フランジ１５３の後端部内側には、スプリング１５２の後端部を支持する突出部１５３ａが形成される。押し金具フランジ１５３の後端部外側には、ボルト４３を締め付けるための複数のねじ孔１５３ｂが同一円周上に形成される。また、押し金具フランジ１５３の先端部には、ボルト４２を挿通させるための複数の挿通孔１５３ｃが同一円周上に形成される。
なお、ボルト４２とボルト４３の円周上の位置は、干渉しないようにずらした位置とされる。また、固定金具４１の固定部４１ａのボルト４２に対応する位置には、ボルト４２をケーブルヘッド２に取り付けられるように切り欠き部（図示略）が設けられる。 A protrusion 153 a that supports the rear end of the spring 152 is formed on the inner side of the rear end of the pressing metal flange 153. A plurality of screw holes 153 b for tightening the bolts 43 are formed on the same circumference on the outer side of the rear end portion of the pressing metal flange 153. In addition, a plurality of insertion holes 153c through which the bolts 42 are inserted are formed on the same circumference at the distal end portion of the pressing metal flange 153.
The positions of the bolts 42 and 43 on the circumference are shifted so as not to interfere with each other. In addition, a notch (not shown) is provided at a position corresponding to the bolt 42 of the fixing portion 41 a of the fixing bracket 41 so that the bolt 42 can be attached to the cable head 2.

固定金具４１は、エポキシブッシング１２のフランジ部１２２の外周に位置する金具円筒部４１ｂと、金具円筒部４１ｂの先端側から径方向外側に張り出して形成され、押し金具フランジ１５３の後端面に当接して固定される固定部４１ａと、金具円筒部４１ｂの後端側から径方向内側に突出して形成され、エポキシブッシング１２のフランジ部１２２の後端面（気中側）に係止される引留部４１ｃとを備える。固定金具４１の固定部４１ａの、押し金具フランジ１５３に形成されたねじ孔１５３ｂと対応する位置には、挿通孔４１ｄが形成される。
固定金具４１の引留部４１ｃをエポキシブッシング１２のフランジ部１２２の後端面１２２ａ（気中側）に係止させ、この状態で固定部４１ａの先端面を押し金具フランジ１５３の後端面に当接させる。そして、ボルト４３を挿通孔４１ｄに挿通させ、押し金具フランジ１５３のねじ孔１５３ｂに締め付けることで、固定金具４１が押し金具フランジ１５３に固定される。圧縮装置１５は、スプリング１５２を支持した状態でエポキシブッシング１２に固定されることとなる。 The fixing metal 41 is formed by protruding from the front end side of the metal fitting cylindrical portion 41b to the outside in the radial direction, and is in contact with the rear end surface of the metal fitting flange 153. And a retaining portion 41c that is formed to project radially inward from the rear end side of the metal fitting cylindrical portion 41b and is engaged with the rear end surface (air side) of the flange portion 122 of the epoxy bushing 12. With. An insertion hole 41 d is formed at a position corresponding to the screw hole 153 b formed in the pressing metal flange 153 of the fixing part 41 a of the fixing metal 41.
The retaining portion 41c of the fixing bracket 41 is locked to the rear end surface 122a (air side) of the flange portion 122 of the epoxy bushing 12, and in this state, the front end surface of the fixing portion 41a is brought into contact with the rear end surface of the pressing bracket flange 153. . Then, the bolts 43 are inserted into the insertion holes 41 d and fastened to the screw holes 153 b of the pressing metal flange 153, whereby the fixing metal 41 is fixed to the pressing metal flange 153. The compression device 15 is fixed to the epoxy bushing 12 with the spring 152 supported.

また、ケーブルヘッド２の絶縁筒部２１ｅの後端面の、押し金具フランジ１５３に形成された挿通孔と対応する位置には、埋込金具４４が配設される。押し金具フランジ１５３の挿通孔１５３ｃにボルト４２を挿通させ、このボルト４２を埋込金具４４に締め付けることで、プラグインブッシング１がケーブルヘッド２に装着される。このとき、圧縮装置１５によって、第２の絶縁補強部１４がケーブルヘッド２側に押圧され、第２の絶縁補強部１４は、弾性変形してケーブルヘッド２の内面に密着することとなる。   Further, the embedded metal fitting 44 is disposed at a position corresponding to the insertion hole formed in the pressing metal flange 153 on the rear end surface of the insulating cylinder portion 21e of the cable head 2. The plug-in bushing 1 is attached to the cable head 2 by inserting the bolt 42 into the insertion hole 153 c of the pressing metal flange 153 and tightening the bolt 42 to the embedded metal fitting 44. At this time, the second insulating reinforcing portion 14 is pressed toward the cable head 2 by the compression device 15, and the second insulating reinforcing portion 14 is elastically deformed and is in close contact with the inner surface of the cable head 2.

導体プラグ１６は、内部導体１１と同様に、通電に適した金属材料で構成され、内部導体１１の先端に接続される。導体プラグ１６は、プラグインブッシング１のケーブルヘッド２への装着作業を容易にするとともに、内部導体１１の先端が損傷しないように保護する。
導体プラグ１６は、機器側導体２２に接続される先端側の小径部１６ａと、内部導体１１に接続される後端側の大径部１６ｂが連設された、断面視「Ｙ」字状の部材である。 The conductor plug 16 is made of a metal material suitable for energization, like the inner conductor 11, and is connected to the tip of the inner conductor 11. The conductor plug 16 facilitates the work of attaching the plug-in bushing 1 to the cable head 2 and protects the tip of the inner conductor 11 from being damaged.
The conductor plug 16 has a “Y” -shaped cross-sectional view in which a small-diameter portion 16 a on the front end side connected to the device-side conductor 22 and a large-diameter portion 16 b on the rear end side connected to the internal conductor 11 are connected. It is a member.

大径部１６ｂの後端面中央には内部導体１１の先端を挿入するための導体挿入孔１６ｃが形成される。また、導体挿入孔１６ｃの内周面にはばね状接触子（図示略）が配設される凹溝１６ｄが形成される。ばね状接触子としては、多点接触方式のコンタクトであるマルチラムバンド（図示略）が配設される。   A conductor insertion hole 16c for inserting the tip of the internal conductor 11 is formed in the center of the rear end surface of the large diameter portion 16b. A concave groove 16d in which a spring contact (not shown) is disposed is formed on the inner peripheral surface of the conductor insertion hole 16c. As the spring-like contactor, a multi-ram band (not shown), which is a multi-point contact type contact, is provided.

導体プラグ１６の大径部１６ｂの後端部周面には、径方向に貫通するねじ孔１６ｅが、円周方向に沿って複数箇所（例えば３箇所）に形成される。導体プラグ１６の導体挿入孔１６ｃに内部導体１１の先端を挿入し、ねじ孔１６ｅに固定ねじ（図示略）を挿入して締め付けることにより、導体プラグ１６は内部導体１１にねじ止めされ、電気的にも接続される。導体プラグ１６と内部導体１１の間にはマルチラムバンド（図示略）が介在するので、両者は良好に導通する。   On the peripheral surface of the rear end portion of the large-diameter portion 16b of the conductor plug 16, screw holes 16e penetrating in the radial direction are formed at a plurality of locations (for example, three locations) along the circumferential direction. The tip of the inner conductor 11 is inserted into the conductor insertion hole 16c of the conductor plug 16, and a fixing screw (not shown) is inserted into the screw hole 16e and tightened, whereby the conductor plug 16 is screwed to the inner conductor 11 to electrically Also connected to. Since a multi-ram band (not shown) is interposed between the conductor plug 16 and the inner conductor 11, both conduct well.

ここで、固定ねじが、機器側導体２２の後端部のシールドに近い部分にあると、シールド内に入り込む電界により、固定ねじが突起となり、部分放電発生の原因になり得るため、好ましくない。そこで、ねじ孔１６ｅに取り付けられる固定ねじ（図示略）が、ケーブルヘッド２の機器側導体２２の後端部のシールド（円弧状部分）より深い位置（受容口２１ｆのより先端側の位置）となるように、ねじ孔１６ｅを形成するのが望ましい。これにより、機器側導体２２のシールド内に入り込む電界の影響を受けにくくなる。   Here, it is not preferable that the fixing screw is in a portion close to the shield at the rear end portion of the device-side conductor 22 because the fixing screw becomes a protrusion due to an electric field entering the shield and may cause partial discharge. Therefore, the fixing screw (not shown) attached to the screw hole 16e is deeper than the shield (arc-shaped part) at the rear end of the device-side conductor 22 of the cable head 2 (position closer to the front end of the receiving port 21f). Thus, it is desirable to form the screw hole 16e. Thereby, it becomes difficult to be influenced by the electric field entering the shield of the device-side conductor 22.

なお、ばね状接触子としては、マルチラムバンドに代えてバルシールを適用してもよい。この場合は、凹溝１６ｄはバルシールを配設するのに適した形状となる。
また、ばね状接触子は、導体挿入孔１６ｃの内周面（凹溝１６ｄ）に設けているが、内部導体１１の先端の外周に設けてもよい。ただし、エポキシブッシング１２のモールド成形を考慮すると、ばね状接触子は、本実施の形態のように、導体挿入孔１６ｃの内周面に形成された凹溝１６ｄに設ける方が好ましい。 In addition, as a spring-like contact, it may replace with a multiram band and may apply a val seal. In this case, the concave groove 16d has a shape suitable for disposing the bull seal.
Further, although the spring-like contact is provided on the inner peripheral surface (concave groove 16d) of the conductor insertion hole 16c, it may be provided on the outer periphery of the tip of the internal conductor 11. However, considering the molding of the epoxy bushing 12, the spring-like contact is preferably provided in the concave groove 16d formed in the inner peripheral surface of the conductor insertion hole 16c as in the present embodiment.

導体プラグ１６とエポキシブッシング１２の間、すなわちエポキシブッシング１２の先端面には環状の絶縁性ストッパー１９が配設される。絶縁性ストッパー１９の先端面は、導体プラグ１６の後端面に当接する。また、絶縁性ストッパー１９の後端面の外周は、ここでは、エポキシブッシング１２の先端部外周を覆うように後端側に突出している。この絶縁性ストッパー１９により、プラグインブッシング１をケーブルヘッド２に装着した際に、圧縮装置１５により押圧される第２の絶縁補強部１４（ストレスコーン）が先端側に伸び出すことを防止している。また、プラグインブッシング１をケーブルヘッド２に挿入する際に、絶縁性ストッパー１９がケーブルヘッド２の内面に摺接することとなるため、ケーブルヘッド２の内面が傷つくのを防止できる。   An annular insulating stopper 19 is disposed between the conductor plug 16 and the epoxy bushing 12, that is, on the front end surface of the epoxy bushing 12. The front end surface of the insulating stopper 19 abuts on the rear end surface of the conductor plug 16. In addition, the outer periphery of the rear end surface of the insulating stopper 19 protrudes to the rear end side so as to cover the outer periphery of the front end portion of the epoxy bushing 12 here. This insulating stopper 19 prevents the second insulation reinforcing portion 14 (stress cone) pressed by the compression device 15 from extending to the tip side when the plug-in bushing 1 is attached to the cable head 2. Yes. Further, when the plug-in bushing 1 is inserted into the cable head 2, the insulating stopper 19 comes into sliding contact with the inner surface of the cable head 2, so that the inner surface of the cable head 2 can be prevented from being damaged.

導体プラグ１６において、小径部１６ａとの連設部位となる大径部１６ｂの先端面には段差部が設けられ、当該段差部（肩部）には第１の絶縁体１８が配設される。ここでは、導体プラグ１６の大径部１６ｂの先端面の段差部の外周と、第１の絶縁体１８の内周とでねじ嵌合されている。第１の絶縁体１８は、例えば超高分子量ポリエチレンであるソマライト（商品名）で構成される。
プラグインブッシング１をケーブルヘッド２に装着する際、導体プラグ１６の大径部１６ｂが機器側ブッシング２１の内周面に摺接しながら挿入される。このとき、大径部１６ｂの肩部が機器側ブッシング２１の内周面に接触すると、機器側ブッシング２１の内周面を損傷させる虞がある。ここでは、大径部１６ｂの肩部に第１の絶縁体１８を設けているので、導体プラグ１６の挿入に伴い機器側ブッシング２１の内周面が損傷するのを効果的に防止できる。 In the conductor plug 16, a stepped portion is provided on the distal end surface of the large diameter portion 16 b which is a continuous portion with the small diameter portion 16 a, and the first insulator 18 is disposed on the stepped portion (shoulder portion). . Here, the outer periphery of the stepped portion of the distal end surface of the large-diameter portion 16 b of the conductor plug 16 and the inner periphery of the first insulator 18 are screw-fitted. The first insulator 18 is made of, for example, Somalite (trade name), which is ultrahigh molecular weight polyethylene.
When the plug-in bushing 1 is attached to the cable head 2, the large-diameter portion 16 b of the conductor plug 16 is inserted while being in sliding contact with the inner peripheral surface of the device-side bushing 21. At this time, if the shoulder portion of the large-diameter portion 16b contacts the inner peripheral surface of the device-side bushing 21, the inner peripheral surface of the device-side bushing 21 may be damaged. Here, since the first insulator 18 is provided on the shoulder portion of the large-diameter portion 16b, it is possible to effectively prevent the inner peripheral surface of the device-side bushing 21 from being damaged as the conductor plug 16 is inserted.

導体プラグ１６において、小径部１６ａの先端には第２の絶縁体１７が配設される。ここでは、導体プラグ１６の先端面に設けられたねじ部と、第２の絶縁体１７の後端面に設けられたねじ孔とでねじ嵌合されている。第２の絶縁体１７は、例えば超高分子量ポリエチレンであるソマライト（商品名）で構成される。
プラグインブッシング１をケーブルヘッド２に装着する際、導体プラグ１６の小径部１６ａがリング状接触子２３（チューリップコンタクト）の後端部に接触することで、電気的に接続される。 In the conductor plug 16, a second insulator 17 is disposed at the tip of the small diameter portion 16a. Here, the screw fitting is performed by the screw portion provided on the front end surface of the conductor plug 16 and the screw hole provided on the rear end surface of the second insulator 17. The second insulator 17 is made of, for example, Somalite (trade name), which is ultrahigh molecular weight polyethylene.
When the plug-in bushing 1 is attached to the cable head 2, the small-diameter portion 16 a of the conductor plug 16 comes into contact with the rear end portion of the ring-shaped contact 23 (tulip contact) to be electrically connected.

通常、ケーブルヘッド２に電力ケーブル端末を装着する場合、電力ケーブル端末側の導体接続端子には、リング状接触子２３による引留構造を設けるために係止部２２ｄ同様に径方向外周に突出した係止構造が設けられ、導体接続端子の先端面と機器側導体２２の係止部２２ｄは接触しない構造とされる。一方、本実施の形態においては、プラグインブッシング１の導体プラグ１６（小径部１６ａ）には、リング状接触子２３（チューリップコンタクト）に引き留めるための係止構造を設けておらず、プラグインブッシング１をケーブルヘッド２に装着する際、機器側導体２２（係止部２２ｄ）にプラグインブッシング１の先端（第２の絶縁体１７）が突き当たることで、プラグインブッシング１の挿入が完了したことを確認する。そのため、機器側導体２２に導体プラグ１６が直接突き当たる構造にすると、機器側導体２２が損傷する虞がある。ここでは、機器側導体２２と導体プラグ１６の先端との間に第２の絶縁体１７が介在するので、プラグインブッシング１のケーブルヘッド２への挿入に伴い機器側導体２２が損傷するのを効果的に防止できる。   Normally, when a power cable terminal is attached to the cable head 2, the conductor connecting terminal on the power cable terminal side is provided with a retaining structure by the ring-shaped contact 23, and the engagement projecting to the outer periphery in the radial direction like the locking part 22 d. A stop structure is provided, and the distal end surface of the conductor connection terminal and the locking portion 22d of the device-side conductor 22 are not in contact with each other. On the other hand, in the present embodiment, the conductor plug 16 (small-diameter portion 16a) of the plug-in bushing 1 is not provided with a locking structure for retaining the ring-like contactor 23 (tulip contact), and the plug-in bushing When the 1 is attached to the cable head 2, the insertion of the plug-in bushing 1 is completed by the tip of the plug-in bushing 1 (second insulator 17) striking the device-side conductor 22 (locking portion 22 d). Confirm. For this reason, if the conductor plug 16 directly contacts the device-side conductor 22, the device-side conductor 22 may be damaged. Here, since the second insulator 17 is interposed between the device-side conductor 22 and the tip of the conductor plug 16, the device-side conductor 22 is damaged as the plug-in bushing 1 is inserted into the cable head 2. It can be effectively prevented.

また、機器側導体２２に導体プラグ１６が直接突き当たる構造にすると、課電されたときに導体プラグ１６から機器側導体２２に直接、又はリング状接触子２３を介して電流が流れる（分流が生じる）。そして、この状態で短絡事故等により大電流が流れると、通電部が高温になり、機器側導体２２及び導体プラグ１６が溶融する虞がある。ここでは、導体プラグ１６と機器側導体２２との間に第２の絶縁体１７が介在することで、導体プラグ１６と機器側導体２２は直接導通せず、リング状接触子２３を介して導通する。すなわち、分流が生じないので、短絡事故等が起きても機器側導体２２及び導体プラグ１６が溶融に至ることはない。   In addition, when the conductor plug 16 directly abuts against the device-side conductor 22, current flows from the conductor plug 16 directly to the device-side conductor 22 or via the ring-shaped contact 23 when power is applied (a shunt current is generated). ). If a large current flows due to a short circuit accident or the like in this state, the current-carrying part becomes high temperature, and the device-side conductor 22 and the conductor plug 16 may melt. Here, since the second insulator 17 is interposed between the conductor plug 16 and the device-side conductor 22, the conductor plug 16 and the device-side conductor 22 are not directly connected but are connected via the ring-shaped contact 23. To do. That is, since no shunting occurs, the device-side conductor 22 and the conductor plug 16 do not melt even if a short circuit accident or the like occurs.

図５はケーブルヘッドとプラグインブッシングの接続状態を示す図で、図６はケーブルヘッドとプラグインブッシングの接続部の拡大図である。
図５に示すように、電力用機器１００の耐電圧試験時には、ケーブルヘッド２が上方に位置するように（ケーブルヘッド２の先端側が下方を向くように）、エレファント部１００Ｂが回動される。そして、電力用機器１００のケーブルヘッド２に、プラグインブッシング１が装着される。 FIG. 5 is a diagram showing a connection state between the cable head and the plug-in bushing, and FIG. 6 is an enlarged view of a connection portion between the cable head and the plug-in bushing.
As shown in FIG. 5, during the withstand voltage test of the power device 100, the elephant unit 100 </ b> B is rotated so that the cable head 2 is positioned upward (the front end side of the cable head 2 faces downward). Then, the plug-in bushing 1 is attached to the cable head 2 of the power device 100.

具体的には、図６に示すように、電力用機器１００のケーブルヘッド２に、機器側ブッシング２１の受容口２１ｆからプラグインブッシング１が挿入される。プラグインブッシング１は、第２の絶縁体１７が機器側導体２２の係止部２２ｄの端面に突き当たる位置まで挿入される。この状態で、リング状接触子２３（チューリップコンタクト）の後端部（図６では上側）内周面が導体プラグ１６の先端部（ここでは小径部１６ａの先端部）外周に接触する。
そして、機器側ブッシング２１の後端面（絶縁筒部２１ｅ）に埋設された埋込金具４４に、押し金具フランジ１５３をボルト４２により固定する。このとき、プラグインブッシング１に予め挿嵌しておいた圧縮装置１５により、第２の絶縁補強部１４は先端側（図６では下側）に押圧され、弾性変形してケーブルヘッド２の内面に密着する。
このように、プラグインブッシング１のケーブルヘッド２への装着作業は極めて簡単である。 Specifically, as shown in FIG. 6, the plug-in bushing 1 is inserted into the cable head 2 of the power device 100 from the receiving port 21 f of the device-side bushing 21. The plug-in bushing 1 is inserted to a position where the second insulator 17 hits the end surface of the locking portion 22d of the device-side conductor 22. In this state, the inner peripheral surface of the rear end (upper side in FIG. 6) of the ring-shaped contact 23 (tulip contact) contacts the outer periphery of the tip of the conductor plug 16 (here, the tip of the small diameter portion 16a).
Then, the pressing metal flange 153 is fixed to the embedded metal fitting 44 embedded in the rear end surface (insulating cylinder portion 21 e) of the device side bushing 21 with the bolt 42. At this time, the second insulation reinforcing portion 14 is pressed to the distal end side (lower side in FIG. 6) by the compression device 15 inserted in advance in the plug-in bushing 1, and elastically deforms to cause the inner surface of the cable head 2. Close contact with.
As described above, the mounting operation of the plug-in bushing 1 to the cable head 2 is extremely simple.

ケーブルヘッド２にプラグインブッシング１を装着した状態において、機器側ブッシング２１の頭部２１ａに対応する受容口２１ｆには、導体プラグ１６が位置する。言い換えれば、機器側導体２２の円筒部２２ｂの内周に導体プラグ１６が位置する。機器側ブッシング２１の胴部２１ｂから遮蔽部２１ｃにわたる部位に対応する受容口２１ｆには、第２の絶縁補強部１４が位置する。機器側ブッシング２１の機器固定部２１ｄから絶縁筒部２１ｅにわたる部位に対応する受容口２１ｆには、圧縮装置１５が位置する。   In a state where the plug-in bushing 1 is attached to the cable head 2, the conductor plug 16 is located in the receiving port 21 f corresponding to the head 21 a of the device-side bushing 21. In other words, the conductor plug 16 is located on the inner periphery of the cylindrical portion 22 b of the device-side conductor 22. The second insulation reinforcing portion 14 is positioned in the receiving port 21f corresponding to the portion extending from the body portion 21b to the shielding portion 21c of the device-side bushing 21. The compression device 15 is located in the receiving port 21f corresponding to the portion extending from the device fixing portion 21d of the device-side bushing 21 to the insulating cylinder portion 21e.

圧縮装置１５により、第２の絶縁補強部１４が機器側ブッシング２１に向けて押圧され、第２の絶縁補強部１４と機器側ブッシング２１との界面に所定の面圧が付与されるため、終端接続側における絶縁性能が確保される。
また、プラグインブッシング１の気中側は、エポキシブッシング１２自体の絶縁耐力と、第１の絶縁補強部１３のコンデンサによる電圧分担で絶縁される。
このように、プラグインブッシング１は、終端接続側、気中側において十分な絶縁性能を有するので、耐電圧試験等、電力用機器１００に課電する際に極めて有用である。 The compression device 15 presses the second insulation reinforcing portion 14 toward the device-side bushing 21 and applies a predetermined surface pressure to the interface between the second insulation reinforcement portion 14 and the device-side bushing 21. Insulation performance on the connection side is ensured.
In addition, the air side of the plug-in bushing 1 is insulated by the dielectric strength of the epoxy bushing 12 itself and the voltage sharing by the capacitor of the first insulation reinforcing portion 13.
Thus, since the plug-in bushing 1 has sufficient insulation performance on the terminal connection side and the air side, it is extremely useful when power is applied to the power device 100 such as a withstand voltage test.

このように、プラグインブッシング１は、棒状の内部導体１１と、内部導体１１の外周面に、内部導体１１の両端が露出するように形成されるエポキシブッシング１２と、エポキシブッシング１２の気中側の外周面に形成される第１の絶縁補強部１３と、エポキシブッシング１２の終端接続側の外周面に形成される第２の絶縁補強部１４と、第２の絶縁補強部１４をケーブルヘッド２に対して押圧する圧縮装置１５と、内部導体１１の終端接続側の先端に接続され、内部導体１１と機器側導体２２（ケーブルヘッド２）を電気的に接続させる導体プラグ１６と、を備えている。また、第１の絶縁補強部１３の電極１３２（電界緩和部）と第２の絶縁補強部１４の導電部１４２は、それぞれエポキシブッシング１２の外周面に形成される導電層１２１と電気的に接続されている。   As described above, the plug-in bushing 1 includes the rod-shaped inner conductor 11, the epoxy bushing 12 formed so that both ends of the inner conductor 11 are exposed on the outer peripheral surface of the inner conductor 11, and the air side of the epoxy bushing 12. The first insulation reinforcing portion 13 formed on the outer peripheral surface of the cable, the second insulation reinforcing portion 14 formed on the outer peripheral surface on the terminal connection side of the epoxy bushing 12, and the second insulating reinforcing portion 14 are connected to the cable head 2. And a conductor plug 16 connected to the end of the inner conductor 11 on the terminal connection side and electrically connecting the inner conductor 11 and the device-side conductor 22 (cable head 2). Yes. Further, the electrode 132 (electric field relaxation portion) of the first insulation reinforcing portion 13 and the conductive portion 142 of the second insulation reinforcing portion 14 are electrically connected to the conductive layer 121 formed on the outer peripheral surface of the epoxy bushing 12, respectively. Has been.

プラグインブッシング１によれば、ガス絶縁開閉装置や変圧器等の電力用機器１００に課電する際、電圧を印加する気中側に終端接続部を設けた電力ケーブルを用いる必要はないので、省スペース化が図られる。また、ガス絶縁開閉装置やガス絶縁変圧器等の絶縁ガスが封入された電力用機器１００にプラグイン式で接続できるので、取付作業が極めて容易であり、絶縁ガスの再封入処理も不要となる。また、解体作業も容易となる。特に、本実施の形態のように、プラグインブッシング１側にリング状接触子２３に係止する構造を設けない場合は、プラグインブッシング１の先端（第２の絶縁体１７）が機器側導体２２（係止部２２ｄ）の端面に突き当てることで挿入されたことを確認するので、取付作業はより容易になり、プラグインブッシング１をリング状接触子２３に係止しない構造のため、極めて容易に解体作業が可能となる。したがって、ガス絶縁開閉装置等の電力用機器１００に対して課電する際の省スペース化、及び作業効率の向上を図ることができる。
また、プラグインブッシング１を用いた耐電圧試験方法によれば、電力用機器１００に課電するためのプラグインブッシング１の取付・解体作業が前述のように改善されるので、作業効率が格段に向上し、極めて簡単に電力用機器１００の耐電圧試験を実施することができる。 According to the plug-in bushing 1, when applying power to the power device 100 such as a gas-insulated switchgear or a transformer, it is not necessary to use a power cable provided with a terminal connection portion on the air side to which a voltage is applied. Space saving is achieved. Moreover, since it can be connected to the power device 100 in which an insulating gas such as a gas-insulated switchgear or a gas-insulated transformer is sealed in by a plug-in method, the installation work is extremely easy, and the insulating gas re-encapsulation process is unnecessary. . Also, the dismantling work is facilitated. In particular, as in the present embodiment, when the structure for locking to the ring-shaped contact 23 is not provided on the plug-in bushing 1 side, the tip end (second insulator 17) of the plug-in bushing 1 is connected to the device-side conductor. 22 (locking portion 22d) is confirmed by being abutted against the end face, so that the mounting work becomes easier and the plug-in bushing 1 is not locked to the ring-shaped contact 23, so Dismantling work can be done easily. Therefore, it is possible to save space and improve work efficiency when power is applied to the power device 100 such as a gas insulated switchgear.
In addition, according to the withstand voltage test method using the plug-in bushing 1, the work of attaching and dismantling the plug-in bushing 1 for applying power to the power device 100 is improved as described above, so that the work efficiency is remarkably improved. The withstand voltage test of the power device 100 can be performed very easily.

［第２の実施の形態］
次に、図７に基づいて、本発明のプラグインブッシングの第２の実施の形態について詳細に説明する。なお、同図において、図３、図４及び図６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。
説明の便宜上、プラグインブッシング５において、フランジ部５２２を境に、電力用機器１００のケーブルヘッド２に装着する側を「終端接続側」と称し、電圧を印加する側を「気中側」と称する。また、以下の説明において、ケーブルヘッド２に挿入する側（図７では下方）を「先端側」、反対側（図７では上方）を「後端側」と称することもある。 [Second Embodiment]
Next, a second embodiment of the plug-in bushing of the present invention will be described in detail based on FIG. In the figure, parts common to those in FIGS. 3, 4 and 6 are denoted by the same reference numerals, and detailed description thereof is omitted.
For convenience of explanation, in the plug-in bushing 5, the side to be attached to the cable head 2 of the power device 100 with the flange portion 522 as a boundary is referred to as “termination connection side”, and the side to which voltage is applied is referred to as “air side”. Called. Further, in the following description, the side to be inserted into the cable head 2 (downward in FIG. 7) may be referred to as “front end side”, and the opposite side (upward in FIG. 7) may be referred to as “rear end side”.

図７に示すように、プラグインブッシング５は、内部導体１１、エポキシブッシング５２、第１の絶縁補強部５３、第２の絶縁補強部１４、圧縮装置１５、導体プラグ１６等を備える。
エポキシブッシング５２は、エポキシ樹脂で構成され、両端から内部導体１１が露出するように、内部導体１１、エポキシブッシング５２及び遮蔽金具５３２はモールド成形により一体的に形成される。エポキシブッシング５２の終端接続側と気中側の間には、終端接続側及び気中側よりも外径が大きいフランジ部５２２が形成される。また、遮蔽金具５３２は、フランジ部５２２の外周面に位置し、後端側（気中側）はエポキシブッシング５２に埋設される。エポキシブッシング５２の気中側の外周面に第１の絶縁補強部５３がモールドにより一体的に形成され、終端接続側の外周面に第２の絶縁補強部１４が形成される。 As shown in FIG. 7, the plug-in bushing 5 includes an inner conductor 11, an epoxy bushing 52, a first insulation reinforcing portion 53, a second insulation reinforcing portion 14, a compression device 15, a conductor plug 16, and the like.
The epoxy bushing 52 is made of an epoxy resin, and the inner conductor 11, the epoxy bushing 52, and the shielding metal fitting 532 are integrally formed by molding so that the inner conductor 11 is exposed from both ends. Between the terminal connection side and the air side of the epoxy bushing 52, a flange portion 522 having a larger outer diameter than the terminal connection side and the air side is formed. The shielding metal fitting 532 is located on the outer peripheral surface of the flange portion 522, and the rear end side (air side) is embedded in the epoxy bushing 52. The first insulation reinforcing portion 53 is integrally formed by molding on the outer peripheral surface of the epoxy bushing 52 in the air, and the second insulating reinforcing portion 14 is formed on the outer peripheral surface of the terminal connection side.

また、エポキシブッシング５２において、第１の絶縁補強部５３の先端部５３ａ（遮蔽金具５３２の先端面）から第２の絶縁補強部１４の後端部１４ａにわたる外周面には、例えば導電塗料を塗布することにより導電層５２１が形成される。なお、図７では、説明の便宜上、導電層５２１を表す破線を、エポキシブッシング５２の外周線より内側に記載している。導電層５２１を接地電位とすることにより、エポキシブッシング５２の遮蔽層が形成される。   Further, in the epoxy bushing 52, for example, a conductive paint is applied to the outer peripheral surface extending from the front end portion 53a of the first insulating reinforcing portion 53 (the front end surface of the shielding metal fitting 532) to the rear end portion 14a of the second insulating reinforcing portion 14. Thus, the conductive layer 521 is formed. In FIG. 7, for convenience of explanation, a broken line representing the conductive layer 521 is shown inside the outer peripheral line of the epoxy bushing 52. The shielding layer of the epoxy bushing 52 is formed by setting the conductive layer 521 to the ground potential.

この導電層５２１の気中側の端部は、第１の絶縁補強部５３の遮蔽金具５３２の先端面と接触する。遮蔽金具５３２の後端側（筒状部５３２ａ）には電界緩和構造が形成されるため、導電層５２１の気中側の端部における電界集中が緩和される。また、導電層５２１の終端接続側の端部は、第２の絶縁補強部１４の導電部１４２と接触し、緩やかな傾斜を有する立ち上がり部を形成する。この傾斜により、導電層１２１の終端接続側の端部に集中する電界が緩和される。   The air-side end of the conductive layer 521 is in contact with the front end surface of the shielding metal fitting 532 of the first insulation reinforcing portion 53. Since the electric field relaxation structure is formed on the rear end side (cylindrical portion 532a) of the shielding metal fitting 532, the electric field concentration at the air-side end portion of the conductive layer 521 is reduced. The end of the conductive layer 521 on the terminal connection side is in contact with the conductive portion 142 of the second insulation reinforcing portion 14 to form a rising portion having a gentle slope. By this inclination, the electric field concentrated on the end of the conductive layer 121 on the terminal connection side is relaxed.

第１の絶縁補強部５３は、エポキシブッシング５２の気中側の外周面にモールドにより一体的に形成され、プラグインブッシング５の気中側でポリマー套管を形成する。ここでは、第１の絶縁補強部５３は、ポリマー被覆体５３１と、遮蔽金具５３２を備える。ポリマー被覆体５３１は、シリコーンゴム等の高分子絶縁材料で構成される。遮蔽金具５３２は、絶縁性ゴム材料にカーボンブラック等を混入して導電性を付与した導電性ゴム材料で構成される。この遮蔽金具５３２が、第１の絶縁補強部５３の電界緩和部となる。   The first insulation reinforcing portion 53 is integrally formed by molding on the outer peripheral surface of the epoxy bushing 52 on the air side, and forms a polymer sleeve on the air side of the plug-in bushing 5. Here, the first insulation reinforcing portion 53 includes a polymer cover 531 and a shielding metal fitting 532. The polymer covering 531 is made of a polymer insulating material such as silicone rubber. The shielding metal fitting 532 is made of a conductive rubber material in which carbon black or the like is mixed into an insulating rubber material to impart conductivity. This shielding metal fitting 532 serves as an electric field relaxation part of the first insulation reinforcing part 53.

ポリマー被覆体５３１は、エポキシブッシング５２の気中側の外周面に設けられ、その外周には、複数個の襞部がポリマー被覆体５３１の長手方向に沿って離間して形成されている。   The polymer cover 531 is provided on the outer peripheral surface of the epoxy bushing 52 in the air, and a plurality of flanges are formed on the outer periphery thereof so as to be separated along the longitudinal direction of the polymer cover 531.

遮蔽金具５３２は、エポキシブッシング５２の気中側の先端側に内部導体１１と同心状に埋設された筒状部５３２ａと、筒状部５３２ａの先端側に連設され、後端面がポリマー被覆体５３１の先端部と当接する中間部５３２ｂと、中間部５３２ｂの先端側に連設され、エポキシブッシング５２のフランジ部５２２の外周面に配設される金具フランジ部５３２ｃを備える。
遮蔽金具５３２の後端部（筒状部５３２ａの後端部）は断面円弧形状のため、遮蔽金具５３２は電界緩和構造を有し、エポキシブッシング５２の気中側の電界を緩和する。 The shielding metal fitting 532 is connected to the front end side of the epoxy bushing 52 concentrically with the internal conductor 11 at the air end side of the epoxy bushing 52, and is connected to the front end side of the cylindrical portion 532a, and the rear end surface thereof is a polymer covering. An intermediate portion 532b that abuts on the distal end portion of 531 and a metal flange portion 532c that is connected to the distal end side of the intermediate portion 532b and is disposed on the outer peripheral surface of the flange portion 522 of the epoxy bushing 52 are provided.
Since the rear end portion of the shielding metal fitting 532 (rear end portion of the cylindrical portion 532a) has an arc shape in cross section, the shielding metal fitting 532 has an electric field relaxation structure and relaxes the electric field on the air side of the epoxy bushing 52.

圧縮装置１５は、押し金具１５１、スプリング１５２、及び押し金具フランジ１５３等を備える。圧縮装置１５は、遮蔽金具５３２によってエポキシブッシング５２に固定される。   The compression device 15 includes a pressing metal 151, a spring 152, a pressing metal flange 153, and the like. The compression device 15 is fixed to the epoxy bushing 52 by a shielding metal fitting 532.

押し金具フランジ１５３の後端部内側には、スプリング１５２の後端部を支持する突出部１５３ａが形成される。押し金具フランジ１５３の後端部外側には、ボルト４５を締め付けるための複数のねじ孔１５３ｂが同一円周上に形成される。また、押し金具フランジ１５３の先端部には、ボルト４２を挿通させるための複数の挿通孔１５３ｃが同一円周上に形成される。
なお、ボルト４２とボルト４５の円周上の位置は、干渉しないようにずらした位置とされる。また、遮蔽金具５３２の金具フランジ部５３２ｃのボルト４２に対応する位置には、ボルト４２をケーブルヘッド２に取り付けられるように切り欠き部（図示略）が設けられる。遮蔽金具５３２の金具フランジ部５３２ｃの先端面にはボルト４５を挿通させるための複数の挿通孔が同一円周上に形成される。 A protrusion 153 a that supports the rear end of the spring 152 is formed on the inner side of the rear end of the pressing metal flange 153. A plurality of screw holes 153b for tightening the bolts 45 are formed on the same circumference on the outer side of the rear end portion of the pressing metal flange 153. In addition, a plurality of insertion holes 153c through which the bolts 42 are inserted are formed on the same circumference at the distal end portion of the pressing metal flange 153.
The positions of the bolts 42 and 45 on the circumference are shifted so as not to interfere with each other. In addition, a notch (not shown) is provided at a position corresponding to the bolt 42 of the metal fitting flange 532 c of the shielding metal 532 so that the bolt 42 can be attached to the cable head 2. A plurality of insertion holes through which the bolts 45 are inserted are formed on the same circumference on the front end surface of the metal fitting flange portion 532 c of the shielding metal fitting 532.

ボルト４５を遮蔽金具５３２の金具フランジ部５３２ｃの挿通孔に挿通させ、押し金具フランジ１５３のねじ孔１５３ｂに締め付けることで、押し金具フランジ１５３が遮蔽金具５３２に固定される。圧縮装置１５は、スプリング１５２を支持した状態でエポキシブッシング５２に固定されることとなる。   The bolt 45 is inserted into the insertion hole of the fitting flange portion 532 c of the shielding fitting 532 and tightened into the screw hole 153 b of the pushing fitting flange 153, so that the pushing fitting flange 153 is fixed to the shielding fitting 532. The compression device 15 is fixed to the epoxy bushing 52 in a state where the spring 152 is supported.

プラグインブッシング５の終端接続側のその他の構成、及び、ケーブルヘッド２への装着方法については、第１の実施の形態のプラグインブッシング１と同じため、説明を省略する。
第２の実施の形態のプラグインブッシング５と第１の実施の形態のプラグインブッシング１の終端接続側の構造は同じため、第２の実施の形態のプラグインブッシング５の気中側の構造に伴う効果及び耐電圧試験方法としての効果は、第１の実施の形態のプラグインブッシング１と同じである。プラグインブッシング５の気中側はモールドにより一体成形しているので、プラグインブッシング１の気中側の絶縁性能に比べてより安定した気中側の電気特性が得られる。 Other configurations on the terminal connection side of the plug-in bushing 5 and the mounting method to the cable head 2 are the same as those of the plug-in bushing 1 of the first embodiment, and thus the description thereof is omitted.
Since the plug-in bushing 5 of the second embodiment and the plug-in bushing 1 of the first embodiment have the same structure on the terminal connection side, the structure of the plug-in bushing 5 of the second embodiment on the air side The effects of the plug-in bushing 1 of the first embodiment are the same as those of the plug-in bushing 1 of the first embodiment. Since the air side of the plug-in bushing 5 is integrally formed with a mold, more stable air-side electrical characteristics than the air-side insulation performance of the plug-in bushing 1 can be obtained.

以上、本発明者によってなされた発明を実施の形態に基づいて具体的に説明したが、本発明は上記実施の形態に限定されるものではなく、その要旨を逸脱しない範囲で変更可能である。
例えば、プラグインブッシング１、５は、耐電圧試験時だけでなく、電力用機器１００に常時課電するブッシングとして適用することもできる。この場合、プラグインブッシング１、５の後端（気中側）には、架空線、引込線等が接続される。プラグインブッシング１の場合は、特に、屋内に設置される電力用機器１００への課電に用いる場合に、紫外線によりゴム製の第１の絶縁補強部１３が劣化することもないので好適である。また、プラグインブッシング５の場合は、気中側でポリマー套管を形成しているので、プラグインブッシング１に比べて、常時課電するブッシングとして好適である。 As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment, and can be changed without departing from the gist thereof.
For example, the plug-in bushings 1 and 5 can be applied not only during a withstand voltage test but also as a bushing that constantly applies power to the power device 100. In this case, an overhead wire, a lead-in wire or the like is connected to the rear ends (air side) of the plug-in bushings 1 and 5. In the case of the plug-in bushing 1, in particular, when used for applying power to the power device 100 installed indoors, the rubber-made first insulation reinforcing portion 13 is not deteriorated by ultraviolet rays, so that it is preferable. . Further, in the case of the plug-in bushing 5, the polymer sleeve is formed on the air side, so that the plug-in bushing 5 is more suitable as a bushing that is constantly charged than the plug-in bushing 1.

今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。   The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

１，５ プラグインブッシング
２ ケーブルヘッド
３ 充電部
１１ 内部導体
１２，５２ エポキシブッシング
１３，５３ 第１の絶縁補強部
１４ 第２の絶縁補強部
１５ 圧縮装置
１６ 導体プラグ
１７ 第２の絶縁体
１８ 第１の絶縁体
１９ 絶縁性ストッパー
２１ 機器側ブッシング
２２ 機器側導体
２３ リング状接触子
４１ 固定金具
４２ ボルト
４３ ボルト
４４ 埋込金具
４５ ボルト
１００ 電力用機器
１００Ａ 機器収容部
１００Ｂ エレファント部
１０１ 接地容器
１２１，５２１ 導電層
１２２，５２２ フランジ部
１３１ 絶縁部
１３２ 電極
１４１ 絶縁ゴム部
１４２ 導電部
１５１ 押し金具
１５２ スプリング
１５３ 押し金具フランジ
５３１ ポリマー被覆体
５３２ 遮蔽金具 1,5 Plug-in bushing 2 Cable head 3 Charging part 11 Internal conductors 12, 52 Epoxy bushing 13, 53 First insulation reinforcement part 14 Second insulation reinforcement part 15 Compressor 16 Conductor plug 17 Second insulator 18 Second 1 Insulator 19 Insulating Stopper 21 Equipment Side Bushing 22 Equipment Side Conductor 23 Ring Contact 41 Fixing Metal 42 Bolt 43 Bolt 44 Embedding Metal 45 Bolt 100 Electric Power Equipment 100A Equipment Housing Part 100B Elephant Part 101 Grounding Container 121, 521 Conductive layers 122 and 522 Flange part 131 Insulating part 132 Electrode 141 Insulating rubber part 142 Conductive part 151 Press fitting 152 Spring 153 Press fitting flange 531 Polymer covering 532 Shielding fitting

Claims (7)

電力ケーブル端末をプラグイン式で接続可能なケーブルヘッドを備えた電力用機器に課電するためのプラグインブッシングであって、
棒状の内部導体と、
前記内部導体の外周面に、前記内部導体の両端が露出するように形成されるエポキシブッシングと、
前記エポキシブッシングの気中側の外周面に形成される第１の絶縁補強部と、
前記エポキシブッシングの終端接続側の外周面に形成される第２の絶縁補強部と、
前記第２の絶縁補強部を前記ケーブルヘッドに対して押圧する圧縮装置と、
前記内部導体の終端接続側の先端に接続され、前記内部導体と前記ケーブルヘッドを電気的に接続させる導体プラグと、を備え、
前記第１の絶縁補強部は、絶縁部と電界緩和部を有し、
前記第２の絶縁補強部は、絶縁ゴム部と導電部を有し、
前記電界緩和部と前記導電部は、それぞれ前記エポキシブッシングの外周面に形成される導電層と電気的に接続されていることを特徴とするプラグインブッシング。 A plug-in bushing for applying power to a power device having a cable head capable of connecting a power cable terminal in a plug-in manner,
A rod-shaped inner conductor;
An epoxy bushing formed on the outer peripheral surface of the inner conductor so as to expose both ends of the inner conductor;
A first insulation reinforcing portion formed on the outer peripheral surface of the epoxy bushing on the air side;
A second insulation reinforcing portion formed on the outer peripheral surface on the terminal connection side of the epoxy bushing;
A compression device for pressing the second insulation reinforcing portion against the cable head;
A conductor plug connected to the end of the inner conductor on the terminal connection side, and electrically connecting the inner conductor and the cable head; and
The first insulation reinforcing part has an insulating part and an electric field relaxation part,
The second insulation reinforcing portion has an insulating rubber portion and a conductive portion,
The electric field relaxation part and the conductive part are electrically connected to a conductive layer formed on an outer peripheral surface of the epoxy bushing, respectively. 前記第１の絶縁補強部が、ゴム製のコンデンサコーンで構成されることを特徴とする請求項１に記載のプラグインブッシング。   2. The plug-in bushing according to claim 1, wherein the first insulation reinforcing portion is formed of a rubber capacitor cone. 前記第１の絶縁補強部の前記絶縁部はポリマー被覆体で構成され、
前記第１の絶縁補強部の前記電界緩和部は遮蔽金具で構成されることを特徴とする請求項１に記載のプラグインブッシング。 The insulating part of the first insulation reinforcing part is composed of a polymer coating;
The plug-in bushing according to claim 1, wherein the electric field relaxation portion of the first insulation reinforcing portion is formed of a shielding metal fitting. 前記ケーブルヘッドは、当該プラグインブッシングの終端接続側を挿入可能な機器側ブッシングと、前記導体プラグと電気的に接続される機器側導体と、を備え、
前記導体プラグは、前記機器側導体に接続される小径部と、前記内部導体に接続される大径部を有し、
前記小径部との連設部位となる前記大径部の先端面に、第１の絶縁体が配設されていることを特徴とする請求項１から３の何れか一項に記載のプラグインブッシング。 The cable head includes a device-side bushing capable of inserting a terminal connection side of the plug-in bushing, and a device-side conductor electrically connected to the conductor plug,
The conductor plug has a small diameter portion connected to the device side conductor and a large diameter portion connected to the internal conductor;
The plug-in according to any one of claims 1 to 3, wherein a first insulator is disposed on a distal end surface of the large-diameter portion serving as a continuous portion with the small-diameter portion. Bushing. 前記ケーブルヘッドは、当該プラグインブッシングの終端接続側を挿入可能な機器側ブッシングと、
前記導体プラグと電気的に接続される機器側導体と、
一端が前記機器側導体に係止され、他端が前記導体プラグに係止しないで接続されるリング状接触子と、を備え、
前記導体プラグの先端には、第２の絶縁体が配設されていることを特徴とする請求項１から４の何れか一項に記載のプラグインブッシング。 The cable head is a device-side bushing capable of inserting a terminal connection side of the plug-in bushing,
A device-side conductor electrically connected to the conductor plug;
One end is locked to the device-side conductor, and the other end is connected to the conductor plug without locking, and a ring-shaped contact,
The plug-in bushing according to any one of claims 1 to 4, wherein a second insulator is disposed at a tip of the conductor plug. 請求項１から５の何れか一項に記載のプラグインブッシングを前記ケーブルヘッドに取り付けて、前記電力用機器に課電することを特徴とする電力用機器の耐電圧試験方法。   A withstand voltage test method for a power device, wherein the plug-in bushing according to any one of claims 1 to 5 is attached to the cable head to apply power to the power device. 請求項５に記載のプラグインブッシングを前記機器側導体に突き当てる位置まで挿入して前記ケーブルヘッドに取り付けて、前記電力用機器に課電することを特徴とする電力用機器の耐電圧試験方法。   A withstand voltage test method for a power device, wherein the plug-in bushing according to claim 5 is inserted to a position where the plug-in bushing abuts against the device-side conductor, is attached to the cable head, and power is applied to the power device. .
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