JPH03273809A - Prefabricated joint and partial discharge detection method for cv cable - Google Patents
Prefabricated joint and partial discharge detection method for cv cableInfo
- Publication number
- JPH03273809A JPH03273809A JP2071421A JP7142190A JPH03273809A JP H03273809 A JPH03273809 A JP H03273809A JP 2071421 A JP2071421 A JP 2071421A JP 7142190 A JP7142190 A JP 7142190A JP H03273809 A JPH03273809 A JP H03273809A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- partial discharge
- connection part
- main electrode
- prefabricated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 8
- 239000004593 Epoxy Substances 0.000 claims abstract description 24
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229920001971 elastomer Polymers 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 16
- 239000012212 insulator Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000009532 heart rate measurement Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、ＣＶケーブル用プレハブ型接続部、特にプ
レハブ型接続部に部分放電を測定するための構成に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a prefabricated connection for CV cables, and in particular to an arrangement for measuring partial discharges in a prefabricated connection.
［従来の技術］
１５４ｋＶ〜２７５ｋＶＣＶケーブルの接続部として、
架橋剤入りポリエチレンテープを用いたテープモールド
式接続部、あるいは押出し装置を用いて溶融ポリエチレ
ンを押出成型により形成する押出モールド式接続部が実
用化されている。後者の押出モールド式接続部は、加熱
モールドによりケーブル絶縁体と一体化するため電気絶
縁性能が優れているが、制限された時間で接続部を組み
立てる場合には適用が難かしいという問題点があった。[Prior art] As a connection part of 154kV to 275kVCV cable,
Tape mold type connections using polyethylene tape containing a crosslinking agent, or extrusion mold type connections formed by extrusion molding of molten polyethylene using an extrusion device have been put into practical use. The latter extrusion mold type connection has excellent electrical insulation performance because it is integrated with the cable insulator by heating molding, but it has the problem that it is difficult to apply when assembling the connection in a limited time. Ta.
そこで、エポキシ樹脂によるエポキシユニットとエチレ
ンプロピレンゴムやシリコンゴム等によるゴムモールド
ストレスコーン、そしてこれに荷重を加えるためのスプ
リングユニット等の部品を予めユニット化して組立て、
それらによって構成されるプレハブ型接続部が開発され
ている。このプレハブ型接続部は、第２図に示すように
、先ず接続されるＣＶケーブル１．１′の端部を段剥ぎ
してケーブル導体２，２′を露出させ、接続管３を被せ
て接続する。この接続部外周に被せる埋込電極４を内部
に埋め込んだエポキシ絶縁筒５は左右の内面が円錐状の
テーパー面５ａを形成した円筒状にモールド成形された
ものである。Therefore, the epoxy unit made of epoxy resin, the rubber mold stress cone made of ethylene propylene rubber, silicone rubber, etc., and parts such as the spring unit for applying load to this were assembled into units in advance.
Prefabricated connections made of these have been developed. As shown in Fig. 2, this prefabricated connection part is made by first stripping off the end of the CV cable 1.1' to be connected, exposing the cable conductors 2, 2', and then covering it with the connecting pipe 3 and connecting it. do. The epoxy insulating cylinder 5 in which the embedded electrode 4 to be placed over the outer periphery of the connection part is embedded is molded into a cylindrical shape with a conical tapered surface 5a formed on the left and right inner surfaces.
そして、埋込電極４の突起部４ａと導体接続管３の外周
は接続される。このエポキシ絶縁筒５の両側から段剥ぎ
されたケーブル１．１′の絶縁体ｌａ、ｌａ′との間に
挿入される先端が円錐状のテーパー面を有するゴムモー
ルドストレスコーン６．６′は、電界を緩和するためそ
れぞれ左右の後部に導電ゴムで形成した導電部６ａ、６
ａ’ とから形成され、左右の導電層部６ａ、６ａ′の
背部６ｂ、６ｂ′を保護銅管７の左右端部に取り付けた
スプリングユニット８，８′の押し金具９゜９′により
一定の荷重により圧着するように押圧する構造となって
いる。Then, the protruding portion 4a of the embedded electrode 4 and the outer periphery of the conductor connecting tube 3 are connected. A rubber molded stress cone 6.6' having a tapered surface with a conical tip is inserted between the insulators la and la' of the cable 1.1' stripped from both sides of the epoxy insulating tube 5. Conductive parts 6a, 6 formed of conductive rubber at the left and right rear portions, respectively, to alleviate the electric field.
a', and the back parts 6b, 6b' of the left and right conductive layer parts 6a, 6a' are fixed to the left and right ends of the protective copper tube 7 by the push fittings 9°9' of the spring units 8, 8'. It has a structure that presses it by applying a load.
しかし、このように部品をユニット化して組立てる構造
であるので、内部が密閉構造となるため、エポキシ絶縁
筒５とゴムモールドストレスコーン６．６′との間およ
びゴムモールドストレスコーン６．６′とケーブル絶縁
体１ａ、ｌａとの間の界面状態が正常かどうか確認する
ことができなかった。この界面状態を確認するためには
、プレハブ型接続部の部分放電を検出することが重要で
あり、このための方法はこれまで存在していなかった。However, since the structure is such that the parts are assembled into units, the inside is sealed, so there are no gaps between the epoxy insulating tube 5 and the rubber mold stress cone 6.6' and between the rubber mold stress cone 6.6'. It was not possible to confirm whether the interface between the cable insulators 1a and 1a was normal. In order to confirm this interface state, it is important to detect partial discharges in prefabricated connections, and no method for this has previously existed.
［発明が解決しようとする課題］
プレハブ型接続部は、金属性の埋込電極を内蔵したエポ
キシ絶縁筒（ユニット）に、ゴムモールドストレスコー
ンを左右から挿着し、このゴムモールドストレスコーン
背面をスプリングユニットにより押し荷重を加えて構成
される。このように、部品を組み合せて構成されるため
、エポキシ絶縁筒とゴムモールドストレスコーンの界面
や、ゴムモールドストレスコーンとケーブル絶縁体との
界面が正常であるかどうかの確認や、長時間使用した場
合の絶縁特性の低下がないのかの判定を行う必要があっ
た。[Problem to be solved by the invention] In the prefabricated connection part, a rubber molded stress cone is inserted from the left and right into an epoxy insulating tube (unit) containing a metal embedded electrode, and the back side of the rubber molded stress cone is It is constructed by applying a pushing load using a spring unit. As it is constructed from a combination of parts, it is difficult to check whether the interface between the epoxy insulation tube and the rubber mold stress cone, or the interface between the rubber mold stress cone and the cable insulator, is normal or not. It was necessary to determine whether there was any deterioration in insulation properties.
ところが部分放電による放電パルスを検出し、ゴムモー
ルドストレスコーンとエポキシ絶縁筒、ゴムモールドス
トレスコーンとケーブル絶縁体の界面が正常状態にある
かどうかを評価する手法がこれまでないという問題点が
あった。However, there has been a problem in that there has been no method to detect discharge pulses caused by partial discharges and to evaluate whether the interfaces between the rubber mold stress cone and the epoxy insulation tube, and between the rubber mold stress cone and the cable insulation are in a normal state. .
この発明は、このような点に鑑みてなされたもので、プ
レハブ型接続部の部分放電を検出できるようにしたＣＶ
ケーブル用プレハブ型接続部と、その部分放電検出方法
を提供することを目的とする。This invention has been made in view of these points, and is a CV device that can detect partial discharges in prefabricated connections.
It is an object of the present invention to provide a prefabricated connection part for a cable and a method for detecting partial discharge thereof.
［課題を解決するための手段］
この発明は、プレハブ型接続部の主絶縁体として用いる
エポキシユニットの外径部表面の導電層を、埋込電極を
カバーできる長さを有する主電極と、さらに所定の長さ
の絶縁体を介して端部のアース電極とを設け、かつ、主
電極に複数個の金属製の測定電極を設け、この測定電極
から測定リード線を各々部分放電検出器に接続し、部分
放電検出器により測定電極からの高周波電流パルスを検
出するようにしたＣＶケーブル用プレハブ型接続部とそ
の部分放電検出方法である。[Means for Solving the Problems] The present invention provides a conductive layer on the surface of the outer diameter part of an epoxy unit used as the main insulator of a prefabricated connection part, and a main electrode having a length that can cover the embedded electrode; A ground electrode is provided at the end via an insulator of a predetermined length, and a plurality of metal measurement electrodes are provided on the main electrode, and each measurement lead wire is connected to a partial discharge detector from this measurement electrode. The present invention also provides a prefabricated connection part for a CV cable and a partial discharge detection method thereof, in which a high-frequency current pulse from a measurement electrode is detected by a partial discharge detector.
［実 施 例］
以下、図面に基づいてこの発明の詳細な説明する。第１
図は、プレハブ型中間接続部の上半部分のみを断面図に
示したもので、前記した従来技術で説明した第２図に示
す同一部材には同一符号を付して説明する。即ち、プレ
ハブ型中間接続部のエポキシユニット５の外周表面に、
このエポキシユニット５内に埋込まれた埋込電極４を覆
う長さの導電層主電極１０を設け、この主電極１０と一
定間隔の絶縁体を介して導電層アース電極１１を設ける
。そして、この導電層主電極ｌＯの左右端部には金属性
の測定電極１３が取付けられる。[Example] Hereinafter, the present invention will be described in detail based on the drawings. 1st
The figure shows only the upper half of the prefabricated intermediate connection part in cross section, and the same members shown in FIG. That is, on the outer peripheral surface of the epoxy unit 5 of the prefabricated intermediate connection part,
A conductive layer main electrode 10 having a length to cover the embedded electrode 4 embedded in this epoxy unit 5 is provided, and a conductive layer earth electrode 11 is provided with an insulator interposed between the main electrode 10 and a constant distance. Metal measurement electrodes 13 are attached to the left and right ends of this conductive layer main electrode lO.
次に、上記のように形成されたエポキシユニット５を使
用して中間接続部を構成する場合を説明する。先ず接続
するＣｖケーブル１，１′の端部を段剥ぎしてケーブル
導体２，２′を露出させ、この外周に接続管３を被せて
接続する。この接続部外周に予め一方のＣＶケーブル１
′に挿通しておいた内面に環状に埋込れた埋込電極４を
有するエポキシユニット５を移動させて被せ、上記接続
管３の突起部と埋込電極４の突起部を当接させて接続す
る０次に、これも予めＣＶケーブルｌ。Next, a case will be described in which the intermediate connection portion is constructed using the epoxy unit 5 formed as described above. First, the ends of the Cv cables 1, 1' to be connected are stripped off in steps to expose the cable conductors 2, 2', and the connecting tube 3 is placed over the outer periphery of the cable conductors 2, 2' for connection. One CV cable 1 is attached to the outer periphery of this connection part in advance.
The epoxy unit 5 having an annular embedded electrode 4 is moved and placed on the inner surface of the tube inserted into the inner surface, and the protruding part of the connecting tube 3 and the protruding part of the embedded electrode 4 are brought into contact with each other. Next, connect the CV cable l in advance.
１′に挿通しておいた先端にテーパー面を有するゴムモ
ールドストレスコーン６．６′を左右から上記エポキシ
ユニット５とＣＶケーブル絶縁体ｌａ、ｌａ′外周との
間に挿入する。そして、上記エポキシユニット５の外周
に２つ割の保護銅管７を被せ、この保護銅管７の左右端
部に取付けられたスプリングユニット８．８′の押し金
具９゜９′により挿入したゴムモールドストレスコーン
６．６′の背面部をそれぞれ中央部側に荷重が加わるよ
うに押し付け、一体化させる。A rubber molded stress cone 6.6' having a tapered tip at the tip, which has been inserted through the tube 1', is inserted between the epoxy unit 5 and the outer periphery of the CV cable insulators la and la' from the left and right. Then, the outer periphery of the epoxy unit 5 is covered with a protective copper tube 7 divided into two parts, and the rubber is inserted by the push fittings 9°9' of the spring units 8 and 8' attached to the left and right ends of the protective copper tube 7. The back parts of the mold stress cones 6 and 6' are pressed together so that a load is applied to the central part side, respectively, to integrate them.
上記エポキシユニット５の外周面には、埋込電極４を覆
う長さに導電層の主電極１０と、この両端に複数個の金
属製の測定電極１３が予め形成されており、これらから
測定リード１ａ１４が保護銅管７の孔を通して外部に引
き出され、検出インピーダンス１５に接続される。また
、上記エポキシユニット５の外周の主電極１０の両側に
は、絶縁体を介してエポキシユニット５の端部外周にア
ース電極１１．１１が予め形成されている。On the outer peripheral surface of the epoxy unit 5, a main electrode 10 of a conductive layer is formed in a length that covers the embedded electrode 4, and a plurality of metal measurement electrodes 13 are formed in advance on both ends of the main electrode 10, from which measurement leads are formed. 1a14 is drawn out to the outside through a hole in the protective copper tube 7 and connected to the detection impedance 15. Further, on both sides of the main electrode 10 on the outer periphery of the epoxy unit 5, ground electrodes 11.11 are previously formed on the outer periphery of the end portion of the epoxy unit 5 via an insulator.
したがって、測定電極１３で受信した放電パルスは測定
リード線１４を通して検出インピーダンス１５を介して
部分放電パルス測定装置１６で検出される。また、コン
デンサ１８の両端にかかる電圧を波形測定装置１７によ
って観察する。測定電極１３を左右の２個所設けること
により、左右に２つあるゴムモールドストレスコーン６
．６′のいずれにおいて部分放電が起きているかが判別
することができる。また、波形測定装置１７によって観
察されたＣＶケーブルの電圧波形と部分放電パルスの測
定波形を比較することにより、ＣＶケーブルの導体電圧
のいずれの位置で部分放電が発生したのかが判別するこ
とができる。なお、波形測定装置１７では変流器（ＣＴ
）を介して電流成分を検出してもよい。Therefore, the discharge pulse received by the measurement electrode 13 is detected by the partial discharge pulse measurement device 16 via the measurement lead 14 and the detection impedance 15 . Further, the voltage applied to both ends of the capacitor 18 is observed by the waveform measuring device 17. By providing the measurement electrodes 13 at two locations on the left and right, the two rubber mold stress cones 6 on the left and right
．． 6', it can be determined in which part the partial discharge is occurring. Furthermore, by comparing the voltage waveform of the CV cable observed by the waveform measurement device 17 with the measured waveform of the partial discharge pulse, it is possible to determine at which position of the conductor voltage of the CV cable the partial discharge has occurred. . Note that the waveform measurement device 17 uses a current transformer (CT
) may be used to detect the current component.
［発明の効果］
以上説明したとおり、この発明のＣＶケーブル用プレハ
ブ型中間接続部は、予め主電極と接地電極がエポキシユ
ニットの外周に設けられており、運転中にもプレハブ型
中間接続部の絶縁診断が可能となる。また、部分放電パ
ルス測定装置と電圧波形測定装置を比較することにより
、電圧位相のどこでコロナが生じているのかが判別でき
る。さらに、金属性測定電極を２つのゴムモールドスト
レスコーンの各々の上に１つづつ設置することにより、
どちらのゴムモールドストレスコーンからコロナが出て
いるのか容易に測定することができ、より正確なＣｖケ
ーブル用プレハブ型接続部の絶縁測定が可能になる。[Effects of the Invention] As explained above, in the prefabricated intermediate connection portion for CV cables of the present invention, the main electrode and the ground electrode are provided in advance on the outer periphery of the epoxy unit, and the prefabricated intermediate connection portion of the prefabricated intermediate connection portion of the present invention is provided in advance on the outer periphery of the epoxy unit. Insulation diagnosis becomes possible. Further, by comparing the partial discharge pulse measuring device and the voltage waveform measuring device, it is possible to determine where in the voltage phase corona is occurring. Furthermore, by placing metallic measuring electrodes, one on each of the two rubber molded stress cones,
It is possible to easily measure from which rubber mold stress cone the corona is coming out, allowing for more accurate insulation measurements of prefabricated connections for Cv cables.
【図面の簡単な説明】
第１図は、この発明の実施例のＣｖケーブル用プレハブ
型中間接続部の構成を示す断面図、第２図は、従来のプ
レハブ型中間接続部の構成を示す断面図である。
６・・・ゴムモールドストレスコーン
８・・・スプリングユニット
０・・・主電極
１・・・接地電極
３・・・金属性測定電極
４・・・測定リード線
５・・・検出インピーダンス
６・・・部分放電パルス測定装置
７・・・波形測定装置
８・・・コンデンサ[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a cross-sectional view showing the configuration of a prefabricated intermediate connection part for a Cv cable according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the configuration of a conventional prefabricated intermediate connection part. It is a diagram. 6... Rubber mold stress cone 8... Spring unit 0... Main electrode 1... Ground electrode 3... Metallic measurement electrode 4... Measurement lead wire 5... Detection impedance 6...・Partial discharge pulse measuring device 7... Waveform measuring device 8... Capacitor
Claims (2)
モールドストレスコーンを組み合わせスプリングによっ
て一定の荷重を加えて構成されるプレハブ型接続部にお
いて、エポキシユニットの外径部表面の埋込み電極の大
部分を覆うように設けた主電極と一定間隔を設けて配置
した接地電極とに分離して導電層を形成することを特徴
としたＣＶケーブル用プレハブ型接続部。(1) In the prefabricated connection part, which is constructed by combining the epoxy unit of the CV cable connection part and a rubber molded stress cone and applying a constant load with a spring, most of the embedded electrodes on the outer diameter surface of the epoxy unit are covered. A prefabricated connection part for a CV cable, characterized in that a conductive layer is formed separately between a main electrode provided in the above manner and a ground electrode arranged at a constant interval.
インピーダンスに接続して部分放電検出器により部分放
電を検出するようにしたことを特徴とするＣＶケーブル
用プレハブ型接続部の部分放電検出方法。(2) Partial discharge of a prefabricated connection part for a CV cable, characterized in that a measurement lead wire is connected to the main electrode, which is connected to a detection impedance, and the partial discharge is detected by a partial discharge detector. Detection method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2071421A JP2674265B2 (en) | 1990-03-20 | 1990-03-20 | Partial discharge detection method for prefabricated type connection part for CV cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2071421A JP2674265B2 (en) | 1990-03-20 | 1990-03-20 | Partial discharge detection method for prefabricated type connection part for CV cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03273809A true JPH03273809A (en) | 1991-12-05 |
| JP2674265B2 JP2674265B2 (en) | 1997-11-12 |
Family
ID=13460032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2071421A Expired - Lifetime JP2674265B2 (en) | 1990-03-20 | 1990-03-20 | Partial discharge detection method for prefabricated type connection part for CV cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2674265B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020055662A1 (en) * | 2018-09-10 | 2020-03-19 | 3M Innovative Properties Company | Support structure for cable and cable accessory condition monitoring devices |
| US11567146B2 (en) | 2018-09-10 | 2023-01-31 | 3M Innovative Properties Company | Electrical power cable monitoring device using low side electrode and earth ground separation |
| US11604218B2 (en) | 2018-09-10 | 2023-03-14 | 3M Innovative Properties Company | Electrical power cable monitoring device including partial discharge sensor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62125322U (en) * | 1986-01-31 | 1987-08-08 | ||
| JPS63131079A (en) * | 1986-11-20 | 1988-06-03 | Furukawa Electric Co Ltd:The | Inspection for connection of power cable |
-
1990
- 1990-03-20 JP JP2071421A patent/JP2674265B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62125322U (en) * | 1986-01-31 | 1987-08-08 | ||
| JPS63131079A (en) * | 1986-11-20 | 1988-06-03 | Furukawa Electric Co Ltd:The | Inspection for connection of power cable |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020055662A1 (en) * | 2018-09-10 | 2020-03-19 | 3M Innovative Properties Company | Support structure for cable and cable accessory condition monitoring devices |
| CN112840516A (en) * | 2018-09-10 | 2021-05-25 | 3M创新有限公司 | Support structure for cable and cable accessory condition monitoring device |
| US11567146B2 (en) | 2018-09-10 | 2023-01-31 | 3M Innovative Properties Company | Electrical power cable monitoring device using low side electrode and earth ground separation |
| US11604218B2 (en) | 2018-09-10 | 2023-03-14 | 3M Innovative Properties Company | Electrical power cable monitoring device including partial discharge sensor |
| CN112840516B (en) * | 2018-09-10 | 2023-03-31 | 3M创新有限公司 | Support structure for cable and cable accessory condition monitoring device |
| US11670930B2 (en) | 2018-09-10 | 2023-06-06 | 3M Innovative Properties Company | Support structure for cable and cable accessory condition monitoring devices |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2674265B2 (en) | 1997-11-12 |
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