JPH0441734Y2 - - Google Patents
Info
- Publication number
- JPH0441734Y2 JPH0441734Y2 JP13756086U JP13756086U JPH0441734Y2 JP H0441734 Y2 JPH0441734 Y2 JP H0441734Y2 JP 13756086 U JP13756086 U JP 13756086U JP 13756086 U JP13756086 U JP 13756086U JP H0441734 Y2 JPH0441734 Y2 JP H0441734Y2
- Authority
- JP
- Japan
- Prior art keywords
- power cable
- shielding layer
- metal
- vibration sensor
- recessed portion
- 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.)
- Expired
Links
- 239000002184 metal Substances 0.000 claims description 37
- 230000001012 protector Effects 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 description 13
- 239000012212 insulator Substances 0.000 description 9
- 230000006866 deterioration Effects 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
Landscapes
- Cable Accessories (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、電力ケーブルの終端接続部または中
間接続部の如き接続部に関し、特にこの接続部に
電圧が印加された時の劣化及び破壊を検出する手
段を備えた電力ケーブルの接続部に関するもので
ある。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to connections such as terminal connections or intermediate connections of power cables, and is particularly concerned with preventing deterioration and destruction when voltage is applied to these connections. The present invention relates to a power cable connection provided with means for detecting.
（従来技術）
この種の電力ケーブル接続部は、ケーブル絶縁
層または導体接続部の外側に設けられた絶縁補強
体の上に絶縁遮蔽層とこの絶縁遮蔽層の外側に設
けられた金属保護管または碍管等の外部保護体と
を有する。この接続部に電力が印加されると、絶
縁補強体が劣化しまたは破壊する。従来技術では
この絶縁劣化または破壊を検出するためにDCリ
ーク、Tan δ，部分放電特性等を電気的に検出
して行なわれていた。しかし、このような方法で
は局部での劣化現象を把握し難い上に測定が困難
であつた。このため、絶縁補強体の劣化に伴なう
機械的振動を検出するセンサを金属保護管または
碍管の外側に取付けることが行なわれている。し
かし、金属保護管または碍管の内部には大量の流
体（油または空気、N2，SF6の如き気体）が充満
しているために絶縁体の微小放電に伴なう振動
（音波）が大きく減衰されるので感度が低く、そ
の上外部からの雑音と識別することが困難であつ
た。(Prior Art) This type of power cable connection consists of an insulating shielding layer on an insulating reinforcing body provided on the outside of the cable insulation layer or the conductor connecting part, and a metal protection tube or It has an external protection body such as an insulator. When power is applied to this connection, the insulation reinforcement deteriorates or breaks down. In the prior art, this insulation deterioration or breakdown was detected by electrically detecting DC leakage, Tan δ, partial discharge characteristics, etc. However, with this method, it is difficult to grasp local deterioration phenomena and it is also difficult to measure them. For this reason, a sensor for detecting mechanical vibrations caused by deterioration of the insulation reinforcement is attached to the outside of the metal protection tube or the porcelain tube. However, because the inside of a metal protection tube or insulator tube is filled with a large amount of fluid (oil, air, gas such as N 2 or SF 6 ), the vibrations (sound waves) caused by minute discharges in the insulator are large. Because the noise is attenuated, the sensitivity is low, and furthermore, it is difficult to distinguish it from external noise.
（考案の目的）
本考案の目的は、高い感度で外部の雑音と確実
に識別して絶縁劣化及び破壊を検出することがで
きる電力ケーブル接続部を提供することにある。(Purpose of the invention) An object of the invention is to provide a power cable connection part that can detect insulation deterioration and breakdown by reliably distinguishing it from external noise with high sensitivity.
（考案の構成）
本考案の電力ケーブル接続部は、電力ケーブル
の接続部本体を保護する金属保護管または碍管等
の外部保護体に設けられた内側にへこんだへこみ
部分の底部でこの接続部本体の絶縁遮蔽層の外部
に機械的振動を検知する振動センサが取付けられ
ていることを特徴としている。(Structure of the invention) The power cable connection part of the invention is formed at the bottom of an inwardly recessed part provided in an external protector such as a metal protection tube or an insulator tube that protects the connection part body of the power cable. A vibration sensor for detecting mechanical vibration is attached to the outside of the insulating shield layer.
このように、金属保護管または碍管等の外部保
護体のへこみ部分に振動センサを設置すると、外
部コロナ雑音を遮蔽することができ、また絶縁遮
蔽層の外側に取付けられているので内部の流体に
よつて振動が減衰されることがなく絶縁劣化及び
破壊を確実に検出することができ、更にこの振動
センサは金属保護管または碍管等の外部保護体の
へこみ部分内に取付けられているので振動センサ
が故障したときに振動センサを外部から容易に交
換することができる。 In this way, by installing a vibration sensor in the recessed part of an external protector such as a metal protection tube or an insulated tube, it is possible to shield external corona noise, and since it is installed outside the insulating shielding layer, it is possible to shield the vibration sensor from the internal fluid. Therefore, vibrations are not attenuated and insulation deterioration and breakdown can be reliably detected.Furthermore, since this vibration sensor is installed inside the recessed part of the external protection body such as a metal protection tube or an insulator tube, the vibration sensor When the vibration sensor breaks down, the vibration sensor can be easily replaced from the outside.
（実施例）
本考案の実施例を図面を参照して詳細に説明す
ると、第１図は本考案に係る電力ケーブル接続部
１０を示し、この第１図の実施例では電力ケーブ
ル接続部１０が終端接続部１０Ａであるのが示し
てある。この終端接続部１０Ａは電力ケーブル１
２のケーブル絶縁層１４、補強絶縁体１６、絶縁
遮蔽層１８を含む接続部本体２０とこの接続部本
体２０を保護する外部保護体とから成つている。
外部保護体は碍管２２と下部金具３０とから構成
されている。(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a power cable connection section 10 according to the present invention, and in the embodiment of FIG. 1, the power cable connection section 10 is A terminal connection 10A is shown. This terminal connection 10A is the power cable 1
The connecting portion body 20 includes two cable insulating layers 14, a reinforcing insulator 16, and an insulating shielding layer 18, and an external protector that protects the connecting portion body 20.
The external protector is composed of an insulator tube 22 and a lower metal fitting 30.
本考案の電力ケーブル接続部１０は、下部金具
３０の内側にへこんだへこみ部分２４の底部で絶
縁遮蔽層１８の外部に機械的振動を検知する振動
センサ２６が取付けられている。振動センサ２６
は、例えば、圧電素子を用いたアコーステイツク
エミツシヨンセンサとして機械的振動を電気的に
検知するものとすることができる。尚、第１図に
おいて符号２８は絶縁補強体１６上に設けられた
エポキシベルマウスである。 In the power cable connecting portion 10 of the present invention, a vibration sensor 26 for detecting mechanical vibration is attached to the outside of the insulating shielding layer 18 at the bottom of the recessed portion 24 recessed inside the lower metal fitting 30. Vibration sensor 26
For example, the sensor may be used as an acoustic emission sensor using a piezoelectric element to electrically detect mechanical vibrations. In FIG. 1, reference numeral 28 is an epoxy bell mouth provided on the insulating reinforcing body 16.
図示の実施例では、特に第３図に示すように、
へこみ部分２４はこの下部金具３０の一部に設け
られた金属管状の壁２４ａを有するへこみから成
つており、振動センサ２６はこのへこみ部分２４
の底部に設けられた金属板である金属体３２の上
に設置されている。尚、第１図及び第３図におい
て符号３４は振動センサ２６のリード線である。 In the illustrated embodiment, as shown in particular in FIG.
The recessed portion 24 consists of a recess having a metal tubular wall 24a provided in a part of the lower fitting 30, and the vibration sensor 26 is located in the recessed portion 24.
It is installed on a metal body 32, which is a metal plate provided at the bottom of the. Note that in FIGS. 1 and 3, reference numeral 34 is a lead wire of the vibration sensor 26.
このように振動センサ２６が管２２のへこみ部
分内で絶縁遮蔽層１８上に設置されていると、部
分放電による振動は外部雑音と混同することなく
振動センサ２６によつて確実に検出される。特
に、絶縁補強体１６は絶縁遮蔽層１８及びエポキ
シベルマウス２８によつて電界緩和され、絶縁遮
蔽層１８と碍管２２の下部及び下部金具３０との
間はストレスが低いか、ストレスがない状態にあ
るのでこの位置に振動センサ２６を配置しても電
気的に問題はない。終端接続部１０Ａの電気的破
壊現象は絶縁遮蔽層１８またはエポキシベルマウ
ス２８と絶縁補強体１６またはケーブル絶縁層１
４との間で生ずることが多いので振動センサ２６
をこの部分に設置するのが好ましい。また、金属
体３２を絶縁遮蔽層１８に密着させておくと、両
者の間に流体が介在しなくなるので部分放電の発
生による振動は振動センサ２６に達するまでに減
衰することがなく高い感度で振動を検知すること
ができるが、金属体３２が絶縁遮蔽層１８と多少
離れていても下部金具３０内であれば流体や気体
による減衰が少なく、また外部雑音の影響もほと
んどないので充分検知することができる。尚、金
属体３２が金属板であると、振動をピツクアツプ
する面積が大きく振動を確実に検知することがで
きるので好ましい。振動センサ２６はこのように
して検知された振動を電気信号に変換し、この電
気信号は増幅処理、波形処理されて絶縁破壊状態
を診断するのに用いられる。また、下部金具３０
に振動センサ２６を設置するへこみ部分２４を設
けると、その感度を高くすることがでい、また振
動センサ２６の故障時にその交換を容易とする
が、その外に外部気中コロナ放電の如き雑音を遮
蔽することができる。 When the vibration sensor 26 is installed on the insulating shielding layer 18 within the concave portion of the tube 22 in this way, vibrations due to partial discharge can be reliably detected by the vibration sensor 26 without being confused with external noise. In particular, the electric field of the insulation reinforcement 16 is relaxed by the insulation shielding layer 18 and the epoxy bell mouth 28, and the stress between the insulation shielding layer 18 and the lower part of the insulator tube 22 and the lower metal fitting 30 is low or no stress. Therefore, there is no electrical problem even if the vibration sensor 26 is placed at this position. The electrical breakdown phenomenon of the terminal connection part 10A is caused by the insulation shielding layer 18 or the epoxy bell mouth 28 and the insulation reinforcement 16 or the cable insulation layer 1.
4, the vibration sensor 26
It is preferable to install it in this part. Furthermore, if the metal body 32 is brought into close contact with the insulating shielding layer 18, there will be no fluid between the two, so the vibrations caused by the occurrence of partial discharge will not be attenuated before reaching the vibration sensor 26, and the vibrations will be highly sensitive. However, even if the metal body 32 is somewhat separated from the insulating shielding layer 18, as long as it is inside the lower metal fitting 30, there is little attenuation due to fluid or gas, and there is almost no influence of external noise, so it can be detected sufficiently. I can do it. It is preferable that the metal body 32 is a metal plate since the area for picking up vibrations is large and vibrations can be detected reliably. The vibration sensor 26 converts the vibration detected in this way into an electrical signal, and this electrical signal is amplified and waveform processed and used to diagnose the dielectric breakdown state. In addition, the lower metal fitting 30
Providing a recessed portion 24 in which the vibration sensor 26 is installed can increase its sensitivity and facilitate replacement when the vibration sensor 26 breaks down, but it also prevents noise such as external corona discharge. can be shielded.
尚、第１図ではエポキベルマスを用いた終端接
続部に適用されているが、ゴムストレスコーンま
たはコンデンンサコーンを用いた終端接続部にも
本考案を同様にして適用することができる。ま
た、へこみ部分２４は第４図に示すように電力ケ
ーブル１２のほぼ径方向に伸縮自在な壁２４ｂか
ら成つていてもよい。このような伸縮自在な壁と
してはベローズまたはコルゲート管を用いること
ができる。特にこのようにへこみ部分２４の壁を
伸縮自在とすると、金属体３２が電力ケーブル接
続部１０の熱伸縮に対応することができるので絶
縁遮蔽層１８、絶縁補強体１６、電力ケーブル１
２を傷付けることがなく、またこの伸縮自在な壁
２４ｂは振動を減衰させることができるため外部
から下部金具３０に侵入する機械的振動による雑
音を小さくして振動センサの感度を向上すること
ができるので好ましい。 In addition, in FIG. 1, the present invention is applied to a terminal connection using epoxy vermiculum, but the present invention can be similarly applied to a terminal connection using a rubber stress cone or a capacitor cone. Further, the recessed portion 24 may be formed of a wall 24b that is expandable and retractable substantially in the radial direction of the power cable 12, as shown in FIG. Bellows or corrugated tubes can be used as such telescoping walls. In particular, when the wall of the recessed portion 24 is made expandable and contractible in this way, the metal body 32 can cope with the thermal expansion and contraction of the power cable connecting portion 10, so that the insulating shielding layer 18, the insulating reinforcing body 16, and the power cable 1 can be expanded and contracted.
2, and this expandable wall 24b can attenuate vibrations, thereby reducing noise caused by mechanical vibrations entering the lower metal fitting 30 from the outside and improving the sensitivity of the vibration sensor. Therefore, it is preferable.
第２図は本考案を電力ケーブルの中間接続部１
０Ｂに適用した例を示す。中間接続部１０Ｂは電
力ケーブル１２，１２′の導体接続部３６を有し、
その上に絶縁補強体１６、絶縁遮蔽層１８及び金
属遮蔽層３８が設けられている。外部保護体であ
る金属保護管４０はこの金属遮蔽層３８から間隔
をあけて設けられ両側の電力ケーブル１２，１
２′に跨つて液密に取付けられている。金属遮蔽
層３８と金属保護管４０との間はストレスがかか
らないでこの空間４２には通常ゴムが充填されて
いるのが普通である。振動センサ２６が設置され
るへこみ部分２４は電気的に弱い金属遮蔽層３８
の両端テーパ部分及び導体接続部３０に近い部分
に設置するのが好ましいが、金属遮蔽層３８の全
周に設置してもよい。 Figure 2 shows the intermediate connection part 1 of the power cable according to the present invention.
An example applied to 0B is shown. The intermediate connection 10B has a conductor connection 36 of the power cable 12, 12';
Thereon, an insulating reinforcement 16, an insulating shielding layer 18 and a metal shielding layer 38 are provided. A metal protection tube 40 serving as an external protector is provided at a distance from this metal shielding layer 38 and connects the power cables 12, 1 on both sides.
2' in a liquid-tight manner. No stress is applied between the metal shielding layer 38 and the metal protection tube 40, and this space 42 is normally filled with rubber. The recessed portion 24 in which the vibration sensor 26 is installed has an electrically weak metal shielding layer 38.
Although it is preferable to install the metal shielding layer 38 in the tapered portions at both ends of the metal shielding layer 38 and in a portion close to the conductor connection portion 30, the metal shielding layer 38 may be provided around the entire circumference of the metal shielding layer 38.
（考案の効果）
本考案によれば、上記のように、金属保護管ま
たは碍管等の外部保護体に設けられたへこみ部分
の底部に振動センサを設置したので外部雑音と混
同することがないから外部回路が簡単となつて装
置が全体的に安価になり、また絶縁劣化及び破壊
を高い感度で確実に検出することができ、また振
動センサはその故障時に交換が容易に行なえるの
で取扱が便利である実益がある。(Effect of the invention) According to the invention, as mentioned above, the vibration sensor is installed at the bottom of the recessed part of the external protector such as a metal protection tube or an insulated tube, so it will not be confused with external noise. The external circuit is simplified, making the device cheaper overall, and insulation deterioration and breakdown can be reliably detected with high sensitivity, and the vibration sensor can be easily replaced in the event of a failure, making it convenient to handle. There is some real benefit.
第１図は本考案を電力ケーブル終端接続部に適
用した実施例の一半部断面図、第２図は本考案を
電力ケーブル中間接続部に適用した実施例の一半
部の断面図、第３図は本考案の要部の拡大断面
図、第４図は本考案に用いられるへこみ部分の変
形例の拡大断面図である。
１０……電力ケーブル接続部、１０Ａ……終端
接続部、１０Ｂ……中間接続部、１２，１２′…
…電力ケーブル、１８……絶縁遮蔽層、２０……
接続部本体、２２……碍管、２４……へこみ部
分、２４ａ……直管状の壁、２４ｂ……伸縮自在
な壁、２６……振動センサ、３２……金属体、３
８……金属遮蔽層、４０……金属保護管。
Fig. 1 is a partial cross-sectional view of an embodiment in which the present invention is applied to a power cable terminal connection part, Fig. 2 is a partial cross-sectional view of a half part of an embodiment in which the present invention is applied to a power cable intermediate connection part, and Fig. 3 4 is an enlarged sectional view of a main part of the present invention, and FIG. 4 is an enlarged sectional view of a modified example of the recessed portion used in the present invention. 10...Power cable connection part, 10A...Terminal connection part, 10B...Intermediate connection part, 12, 12'...
...Power cable, 18...Insulating shielding layer, 20...
Connection body, 22... Insulator pipe, 24... Recessed portion, 24a... Straight tubular wall, 24b... Expandable wall, 26... Vibration sensor, 32... Metal body, 3
8...Metal shielding layer, 40...Metal protection tube.
Claims (1)
護体に設けられた内側にへこんだへこみ部分の
底部で前記接続部本体の絶縁遮蔽層の外部に機
械的振動を検知する振動センサが取付けられて
いることを特徴とする電力ケーブル接続部。 (2) 前記へこみ部分の底部は金属体である実用新
案登録請求の範囲第１項に記載の電力ケーブル
接続部。 (3) 前記へこみ部分の壁は直管である実用新案登
録請求の範囲第１項または第２項に記載の電力
ケーブル接続部。 (4) 前記へこみ部分の壁は前記電力ケーブルのほ
ぼ径方向に伸縮自在な壁である実用新案登録請
求の範囲第１項または第２項に記載の電力ケー
ブル接続部。 (5) 前記センサはアコーステイツクエミツシヨン
センサである実用新案登録請求の範囲第１項乃
至第４項のいずれかに記載の電力ケーブル接続
部。 (6) 前記金属体は前記絶縁遮蔽層のテーパ部近傍
または導体接続部の外周近傍に設置された金属
板から成つている実用新案登録請求の範囲第２
項に記載の電力ケーブル接続部。[Claims for Utility Model Registration] (1) Mechanical vibration occurs outside the insulating shielding layer of the connection body at the bottom of the inwardly recessed part provided in the external protector that protects the power cable connection body. A power cable connection section characterized by being equipped with a vibration sensor that detects. (2) The power cable connecting portion according to claim 1, wherein the bottom of the recessed portion is a metal body. (3) The power cable connecting portion according to claim 1 or 2, wherein the wall of the recessed portion is a straight pipe. (4) The power cable connecting portion according to claim 1 or 2, wherein the wall of the recessed portion is a wall that is expandable and retractable substantially in the radial direction of the power cable. (5) The power cable connection unit according to any one of claims 1 to 4, wherein the sensor is an acoustic emission sensor. (6) The metal body is a metal plate installed near the tapered part of the insulating shielding layer or near the outer periphery of the conductor connection part.
Power cable connections as described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13756086U JPH0441734Y2 (en) | 1986-09-08 | 1986-09-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13756086U JPH0441734Y2 (en) | 1986-09-08 | 1986-09-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6344631U JPS6344631U (en) | 1988-03-25 |
| JPH0441734Y2 true JPH0441734Y2 (en) | 1992-09-30 |
Family
ID=31041729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13756086U Expired JPH0441734Y2 (en) | 1986-09-08 | 1986-09-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0441734Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2514350Y2 (en) * | 1990-05-09 | 1996-10-16 | 古河電気工業株式会社 | Rubber / Plastic power cable connection |
| JP2583420Y2 (en) * | 1992-03-10 | 1998-10-22 | 古河電気工業株式会社 | Rubber / plastic power cable connection |
-
1986
- 1986-09-08 JP JP13756086U patent/JPH0441734Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6344631U (en) | 1988-03-25 |
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