JPS596106Y2 - insulation junction box - Google Patents
insulation junction boxInfo
- Publication number
- JPS596106Y2 JPS596106Y2 JP9028579U JP9028579U JPS596106Y2 JP S596106 Y2 JPS596106 Y2 JP S596106Y2 JP 9028579 U JP9028579 U JP 9028579U JP 9028579 U JP9028579 U JP 9028579U JP S596106 Y2 JPS596106 Y2 JP S596106Y2
- Authority
- JP
- Japan
- Prior art keywords
- sheath
- junction box
- protection device
- terminals
- insulating
- 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
Landscapes
- Cable Accessories (AREA)
Description
【考案の詳細な説明】
本考案は、高電圧電力ケーブルのシース保護の改良に係
り、特にシース保護装置において放電ギャップ部分をな
くした電力ケーブル線路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the sheath protection of a high voltage power cable, and more particularly to a power cable line in which a discharge gap portion is eliminated in a sheath protection device.
一般に単心電力ケーブルによる3相送配電線路において
は、ケープルシースに循環電流が流れないようにするた
め第1図に示されるように、ケープルシースを絶縁接続
箱1で接続すると共にそれらのケープルシース間をボン
デイングワイヤ2でクロスボンドし、該クロスボンド点
を各々放電ギャップ3.3’,3”および非線形抵抗体
4.4’,4“から或るケープルシース保護装置を通し
て接続するようにしている。In general, in three-phase power transmission and distribution lines using single-core power cables, in order to prevent circulating current from flowing through the cable sheaths, the cable sheaths are connected with an insulating junction box 1, as shown in Figure 1, and the cable sheaths are A bonding wire 2 is used to cross-bond between the two, and the cross-bond points are connected to the discharge gap 3.3', 3'' and the nonlinear resistor 4.4', 4'' through a cable sheath protection device. .
この場合仮りにA相のケーブル導体に開閉サージその他
の異常電圧に基づく電流iが侵入した場合、このケープ
ルシースにはこれに対応する電流i′が誘起するがケー
プルシースは接続箱で絶縁的に接続されているから、こ
の電流は点線で示してあるように放電ギャップ3′、非
線形抵抗体4′、大地、非線形抵抗体4″、放電ギャッ
プ3″を経て流れることになる。In this case, if a current i due to switching surge or other abnormal voltage enters the A-phase cable conductor, a corresponding current i' will be induced in the cable sheath, but the cable sheath is insulated in the junction box. Since they are connected, this current will flow through the discharge gap 3', the nonlinear resistor 4', the ground, the nonlinear resistor 4'', and the discharge gap 3'' as shown by the dotted line.
従って放電ギャップは電流i′を流すに充分な大きさと
しておく必要がある。Therefore, the discharge gap must be large enough to allow current i' to flow.
一方、放電ギャップには第2図に示されるようにV−t
特性があり、立ち上りの急峻な波形の電圧に対しては放
電電圧が高くなる傾向にある。On the other hand, in the discharge gap, as shown in FIG.
There is a characteristic that the discharge voltage tends to be high for a voltage with a steep rising waveform.
このため絶縁接続部に保護装置を取り付けてあるにもか
かわらずその制限電圧(ケーブル線路においては14
KV)以上の電圧が絶縁接続部にあらわれるケースが多
く、この結果、保護装置がその特性を十分に機能してい
ない不都合がある。For this reason, even though a protective device is installed on the insulated connection, its limited voltage (14
In many cases, a voltage of more than KV) appears at the insulating connection, and as a result, the protective device does not function to its full potential.
このため、第3図に示すように非線形抵抗体5を収納す
る保護ケース6と、このケースの上部位置に有し、非線
形抵抗体5の上端に電気的に接続されている端子7と、
保護ケース6の下部位置に有し、接地側リード線に電気
的に接続されている電極8と、上端が非線形抵抗体5の
下端に電気的に接続され、下端が、電極8に対し接離自
在に接圧されている電極板9に電気的に接続されている
スプリング10とから戊るシース保護装置が提案されて
いる。For this purpose, as shown in FIG. 3, there is provided a protective case 6 that houses the nonlinear resistor 5, a terminal 7 located at the upper part of the case, and electrically connected to the upper end of the nonlinear resistor 5.
An electrode 8 is located at the lower part of the protective case 6 and is electrically connected to the ground lead wire, and the upper end is electrically connected to the lower end of the nonlinear resistor 5, and the lower end is connected to and separated from the electrode 8. A sheath protection device has been proposed that includes a spring 10 that is electrically connected to an electrode plate 9 that is freely pressed.
かかる構或のシース保護装置は、前述のギャップの放電
遅れによる過電圧の発生を防止しうる点ではそれなりに
有効であるが、シース保護装置が接続箱の接続端子とア
ース間にリード線を介してマンホールの壁面に取付けら
れているので、リード線の長さが長くなり、(約3〜1
0m程度)それによる電圧降下が大きいためサージ侵入
時に絶縁接続箱にシース保護装置定格の2〜3倍もの電
圧が発生する難点があった。Although the sheath protection device with such a structure is reasonably effective in preventing the generation of overvoltage due to the discharge delay in the gap described above, Since it is attached to the wall of the manhole, the length of the lead wire is long (approximately 3 to 1
(approximately 0 m), the resulting voltage drop is large, so when a surge enters the insulated junction box, a voltage two to three times the rating of the sheath protection device is generated.
さりながら、シース保護装置をマンホールの壁面に取付
ける構戊のものにおいては、リード線を短かくすること
は不可能である。However, in a structure in which the sheath protection device is attached to the wall of a manhole, it is impossible to shorten the lead wire.
また、かかるシース保護装置は、保護ケース6内にスプ
リング10が存在するのでその構戊上必然的にシース保
護装置が大型化し、重量が重くなる難点もある。Further, since the spring 10 is present in the protective case 6, such a sheath protection device inevitably becomes large in size and heavy in weight.
本考案は上記の事情に基きなされたもので、シース保護
装置を接続両ケーブルの金属シース間に直接取付けた絶
縁接続箱を提供する。The present invention has been made based on the above-mentioned circumstances, and provides an insulated junction box in which a sheath protection device is directly attached between the metal sheaths of both connecting cables.
本考案は理論検討、実測の結果得られた次の知見に基く
。This invention is based on the following findings obtained from theoretical studies and actual measurements.
すなわち、シース保護装置の一端の電極を接地すること
なく、各端の電極を絶縁接続箱のそれぞれのシースに接
続するだけで、十分なサージ抑制効果が得られることが
わかっている。That is, it has been found that a sufficient surge suppression effect can be obtained by simply connecting the electrodes at each end to the respective sheaths of the insulated junction box without grounding the electrode at one end of the sheath protection device.
本考案においては、ギャップレスアレスタとして知られ
た非線形抵抗素子を使用してシース保護装置を小型化し
、絶縁接続箱の各シースにその電極端子を接続して前記
目的を達威している。In the present invention, a non-linear resistance element known as a gapless arrester is used to miniaturize the sheath protection device, and its electrode terminals are connected to each sheath of the insulating junction box to achieve the above object.
以下、図面につき本考案の詳細を説明する。Hereinafter, the present invention will be explained in detail with reference to the drawings.
第4図に示すように円板状の非線形抵抗素子11の各面
にはそれぞれ径方向に1個の端子12.13を突出させ
た円板状の電極14.15が端子12.13が非線形抵
抗素子11の一つの直径の延長上にある如くして装着さ
れ、これらの構体は、各端子の端部近傍の部分を露出さ
せて合或樹脂、合或ゴム等による防水層16でモールド
されている。As shown in FIG. 4, each surface of the disc-shaped nonlinear resistance element 11 has a disc-shaped electrode 14.15 with one terminal 12.13 protruding in the radial direction. These structures are mounted so as to extend along one diameter of the resistor element 11, and are molded with a waterproof layer 16 made of resin, rubber, etc., with the portion near the end of each terminal exposed. ing.
なお、この防水層は前記の素子直径に平行な軸線を有す
る円筒面の一部となる如く彎曲されている。Note that this waterproof layer is curved so as to become part of a cylindrical surface having an axis parallel to the element diameter.
上記構或のシース保護装置17は第5図に示す如くして
絶縁接続箱18に取付ける。The sheath protection device 17 having the above structure is attached to the insulating junction box 18 as shown in FIG.
すなわち、絶縁接続箱18の各シース防食層19から突
出したシース端子20にリード線21を介して、シース
保護装置17の電極端子12.13を接続して取付ける
。That is, the electrode terminals 12 and 13 of the sheath protection device 17 are connected and attached to the sheath terminals 20 protruding from each sheath anticorrosion layer 19 of the insulating connection box 18 via the lead wires 21.
上記のように本考案のシース保護装置は絶縁接続箱18
に直接取付けることができるので、リード線21を最小
限の長さ(約50cm)とすることができるから、サー
ジ侵入時に絶縁接続箱のシースに発生する異常電圧を抑
制し得る。As mentioned above, the sheath protection device of the present invention
Since the lead wire 21 can be directly attached to the sheath of the insulating junction box, the length of the lead wire 21 can be reduced to a minimum (approximately 50 cm), thereby suppressing abnormal voltage generated in the sheath of the insulated junction box when a surge enters.
なお、本考案は上記実施例のみに限定されない。Note that the present invention is not limited to the above embodiments.
例えば、非線形抵抗素子の形状は円板状以外の任意の形
状でよい。For example, the shape of the nonlinear resistance element may be any shape other than a disk shape.
また、防水層も必ずしも彎曲させる必要はない。Furthermore, the waterproof layer does not necessarily need to be curved.
第1図は従来のクロスボンド絶縁接続部のシース保護装
置の設置状態を説明するための模式図、第2図は放電ギ
ャップのV一t特性を示す説明図、第3図は従来のシー
ス保護装置の説明図、第4図A,B,Cは本考案におい
て使用するシース保護装置の切断平面図、切断正面図、
切断側面図、第5図は本考案一実施例の正面図である。
11・・・・・・非線形抵抗素子、14.15・・・・
・・電極、12,13・・・・・・電極端子、16・・
・・・・防水層、19・・・・・・防食層、20・・・
・・・シース端子。Figure 1 is a schematic diagram to explain the installation state of a sheath protection device for a conventional cross-bond insulation connection, Figure 2 is an explanatory diagram showing the Vt characteristics of a discharge gap, and Figure 3 is a diagram of a conventional sheath protection device. An explanatory diagram of the device, FIGS. 4A, B, and C are a cutaway plan view and a cutaway front view of the sheath protection device used in the present invention,
A cutaway side view and FIG. 5 are front views of one embodiment of the present invention. 11...Nonlinear resistance element, 14.15...
...Electrode, 12, 13... Electrode terminal, 16...
...Waterproof layer, 19...Anti-corrosion layer, 20...
...Sheath terminal.
Claims (1)
接続両ケーブルの金属シー又と導通する絶縁接続箱シー
スをそなえたものにおいて、前記絶縁接続箱シースには
その外周に被覆された防蝕層から突出するシース端子を
それぞれ設け、これらのシース端子には、前記絶縁筒の
両端間に生ずる異常電圧を抑制する非線形抵抗素子をモ
ールドした防水層でおおいその電極端子のみを露出させ
て或るシース保護装置の前記各電極端子を接続して或る
絶縁接続箱。It has an insulating tube that insulates between the sheaths, and on both sides of this insulating tube,
The insulated junction box sheath is provided with an insulated junction box sheath that conducts with the metal sheath of both connecting cables, and each of the insulated junction box sheaths is provided with sheath terminals that protrude from a corrosion-resistant layer coated on its outer periphery, and these sheath terminals have , an insulating connection is made by connecting each of the electrode terminals of a sheath protection device by covering only the electrode terminals with a waterproof layer molded with a non-linear resistance element that suppresses abnormal voltage occurring between both ends of the insulating cylinder; box.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9028579U JPS596106Y2 (en) | 1979-06-30 | 1979-06-30 | insulation junction box |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9028579U JPS596106Y2 (en) | 1979-06-30 | 1979-06-30 | insulation junction box |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS569828U JPS569828U (en) | 1981-01-28 |
JPS596106Y2 true JPS596106Y2 (en) | 1984-02-24 |
Family
ID=29323404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9028579U Expired JPS596106Y2 (en) | 1979-06-30 | 1979-06-30 | insulation junction box |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS596106Y2 (en) |
-
1979
- 1979-06-30 JP JP9028579U patent/JPS596106Y2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS569828U (en) | 1981-01-28 |
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