JPH0140575B2 - - Google Patents
Info
- Publication number
- JPH0140575B2 JPH0140575B2 JP2117881A JP2117881A JPH0140575B2 JP H0140575 B2 JPH0140575 B2 JP H0140575B2 JP 2117881 A JP2117881 A JP 2117881A JP 2117881 A JP2117881 A JP 2117881A JP H0140575 B2 JPH0140575 B2 JP H0140575B2
- Authority
- JP
- Japan
- Prior art keywords
- cable
- molding
- conductive
- fitting
- heating tube
- 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
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000000465 moulding Methods 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 5
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 5
- 239000012778 molding material Substances 0.000 claims description 4
- 239000012212 insulator Substances 0.000 description 6
- 239000011261 inert gas Substances 0.000 description 5
- 238000012856 packing Methods 0.000 description 5
- 239000004636 vulcanized rubber Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 238000005187 foaming Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Processing Of Terminals (AREA)
Description
【発明の詳細な説明】
この発明は電力ケーブル、特に架橋ポリエチレ
ン絶縁電力ケーブル（以下CVケーブルという）
における終端接続部油止め部の形成方法に関する
ものである。[Detailed Description of the Invention] This invention relates to power cables, particularly cross-linked polyethylene insulated power cables (hereinafter referred to as CV cables).
The present invention relates to a method of forming an oil stopper portion of an end connection portion in the present invention.
CVケーブルは油入りケーブル（OFケーブル）
とは異なり、ケーブル自体が液体で絶縁されてい
ないので、接続部に絶縁油を用いる場合には、接
続部において油止めを行なう必要がある。その油
止め方法としては、ゴムパツキングを用いケーブ
ルの外部半導電層上で行なう方法があるが、この
方法はケーブルの真円度等の点から充分な精度を
得難い欠点がある。そのため、充分高い真円度を
得るためにパイプ形の金具をケーブルの外周には
め、その金具をケーブルにモールド接着する方法
が知られている。第１図は、このような金具を用
いた場合の油中終端接続部を示すものであり、ケ
ーブル１の囲りにモールド用金具２をはめ、その
金具２とケーブル１間に油止め部３をモールド成
形すると共に、金具２と取付金具４の間にパツキ
ング５を介在するようにしている。上記の油止め
部３は、従来第２図に示す方法により形成されて
いた。 CV cable is oil-filled cable (OF cable)
Unlike cables, the cable itself is not insulated with liquid, so if insulating oil is used at the connection, it is necessary to seal the connection with oil. One way to stop the oil is to use rubber packing on the outer semiconducting layer of the cable, but this method has the disadvantage that it is difficult to obtain sufficient precision in terms of the roundness of the cable. Therefore, in order to obtain sufficiently high roundness, a method is known in which a pipe-shaped metal fitting is fitted around the outer circumference of the cable and the metal fitting is bonded to the cable by molding. Fig. 1 shows an oil submerged terminal connection when such a fitting is used.A molding fitting 2 is fitted around the cable 1, and an oil stopper 3 is placed between the fitting 2 and the cable 1. are molded, and a packing 5 is interposed between the metal fitting 2 and the mounting metal fitting 4. The oil stopper 3 described above has conventionally been formed by the method shown in FIG.
即ち、ケーブル１の囲りにモールド用金具２を
はめ、その両端部とケーブル１の間に導電性プラ
スチツク材料６を巻き付け、更に加硫ゴムテープ
７を全面に巻き付けて加圧した上で加熱すること
により、前記の油止め部３をモールド成形する方
法である。上記の加硫ゴムテープ７はケーブル１
の絶縁体のまわりを加圧することにより、モール
ド成形時の加熱によるケーブル絶縁体の発泡を防
止するものである。このとき、モールド用金具２
の部分では、加硫ゴムテープ７に加圧力がケーブ
ル１に加わらないが、この部分においては、上記
金具２の熱膨張係数がケーブル絶縁体の熱膨張係
数より大きいことを利用し、空隙８の大きさを適
当に設定しておくことにより、加熱時の金具２の
熱膨張により、ケーブル絶縁体を加圧し、発泡を
防止する。 That is, a molding fitting 2 is fitted around the cable 1, a conductive plastic material 6 is wrapped between both ends of the cable 1 and the cable 1, and a vulcanized rubber tape 7 is further wrapped around the entire surface and heated after being pressurized. This is a method of molding the oil stopper part 3. The above vulcanized rubber tape 7 is the cable 1
By applying pressure around the insulator, it is possible to prevent the cable insulator from foaming due to heating during molding. At this time, mold fittings 2
In this part, no pressing force is applied to the cable 1 by the vulcanized rubber tape 7, but in this part, the size of the gap 8 is adjusted by taking advantage of the fact that the coefficient of thermal expansion of the metal fitting 2 is larger than that of the cable insulator. By setting the thickness appropriately, the thermal expansion of the metal fitting 2 during heating pressurizes the cable insulator and prevents foaming.
しかしながら、上記の方法によるときはケーブ
ル１の真円度が低いために、モールド用金具２の
内周とケーブル１との間の空隙８を均一な大きさ
に管理することは甚だ困難であり、これが小さ過
ぎるとモールド用金具２の熱膨張によつてケーブ
ル１に作用する圧力が過大となり、ケーブル１の
変形、絶縁体の割れ等を生じる。逆に、上記の空
隙８が大きすぎるとケーブル１に作用する圧力が
零になるため、ケーブル１が発泡し電気的性能を
低下させる問題がある。 However, when using the above method, since the circularity of the cable 1 is low, it is extremely difficult to control the gap 8 between the inner circumference of the molding fitting 2 and the cable 1 to a uniform size. If this is too small, the pressure acting on the cable 1 due to thermal expansion of the molding fitting 2 will become excessive, resulting in deformation of the cable 1, cracking of the insulator, etc. On the other hand, if the gap 8 is too large, the pressure acting on the cable 1 becomes zero, which causes the cable 1 to foam and deteriorate its electrical performance.
以上のように、従来の油止め部形成方法におい
ては、モールド用金具によつてケーブル絶縁体に
加えられる圧力をコントロールすることが困難で
あることにかんがみ、この発明はその圧力を自由
にコントロールできるようにした油止め部の形成
方法を提供することを目的としている。 As described above, in consideration of the fact that in the conventional oil stopper forming method, it is difficult to control the pressure applied to the cable insulator by the molding fittings, this invention allows the pressure to be freely controlled. It is an object of the present invention to provide a method for forming an oil stopper.
以下、この発明を第３図乃至第５図に示す実施
例に基づいて説明する。 The present invention will be explained below based on the embodiments shown in FIGS. 3 to 5.
この発明の実施に使用するパイプ形モールド用
金具１０には小孔１１が設けられている。この小
孔１１は、第５図に示すようにねじ孔に形成さ
れ、この小孔１１によつて金具１０内面の空隙１
２が金具１０の外部を連通している。この場合の
空隙１２は金具１０が熱膨張してもケーブル１に
接触しない程度に設定される。油止め部１３のモ
ールド材料として導電性未加硫ゴムテープ１４を
金具１０の端部とケーブル１の間に巻き付け、そ
の上に導電性収縮チユーブ１５を巻き付け、更に
その上に導電性架橋ポリエチレンテープ１６及び
導電性収縮チユーブ１７を順に巻き付けてモール
ド成形の準備をする。次に、第３図に示すように
上記材料の巻き付け部を含むケーブル１の囲りに
加熱管１８をはめる。加熱管１８は上下に分割さ
れており、第４図に示すように両側の突き合せ縁
にパツキング１９を介在すると共に、外周面を締
付けバンド２０により一体に締付けるようになつ
ている。また各締付バンド２０の間にはヒータ２
１が取付けられている。加熱管１８の端面には、
パツキング２２及び押え板２３を順に当て、ボル
ト２５によつてこれらを加熱管１８に一体化す
る。なお、加熱管１８の一部には不活性ガス
（N2、SF6等）の導入管２４接続されている。以
上の構成により、加熱管１８はケーブル１の囲り
に気密状態に取付けられることになる。 A small hole 11 is provided in the pipe-shaped mold fitting 10 used for carrying out the present invention. This small hole 11 is formed as a screw hole as shown in FIG.
2 communicates with the outside of the metal fitting 10. In this case, the gap 12 is set to such an extent that even if the metal fitting 10 expands thermally, it will not come into contact with the cable 1. A conductive unvulcanized rubber tape 14 is wound between the end of the metal fitting 10 and the cable 1 as a molding material for the oil stopper 13, a conductive shrink tube 15 is wound thereon, and a conductive crosslinked polyethylene tape 16 is further wound thereon. and conductive shrink tube 17 are wound in order to prepare for molding. Next, as shown in FIG. 3, a heating tube 18 is fitted around the cable 1 including the wrapped portion of the above material. The heating tube 18 is divided into an upper part and an upper part, and as shown in FIG. 4, a packing 19 is interposed at the abutting edges on both sides, and the outer peripheral surface is tightened together by a tightening band 20. Also, between each tightening band 20 there is a heater 2.
1 is installed. On the end surface of the heating tube 18,
The packing 22 and the presser plate 23 are applied in this order, and these are integrated into the heating tube 18 with bolts 25. Note that a part of the heating tube 18 is connected to an inert gas (N 2 , SF 6 , etc.) introduction tube 24 . With the above configuration, the heating tube 18 is attached around the cable 1 in an airtight manner.
そこで、上記の油止め部１３をモールド成形す
るには、ヒータ２１によつて加熱管１８を加熱
し、その内面からの幅射熱によつてモールド材料
を加熱すると共に、前記の導入管２４から加圧下
（２〜10Kg／cm2）の不活性ガスを充填する。金具
１０には前述のように小孔１１が設けられている
ため、金具１０内面の空隙１２は金具１０外部の
圧力と等しくなる。したがつて、ガス圧を適宜調
節することにより、空隙１２内部を所定の圧力に
コントロールすることができる。 Therefore, in order to mold the oil stopper 13, the heating tube 18 is heated by the heater 21, and the molding material is heated by the radiant heat from the inner surface of the heating tube 18. Fill with inert gas under pressure (2-10 Kg/cm 2 ). Since the metal fitting 10 is provided with the small holes 11 as described above, the air gap 12 on the inner surface of the metal fitting 10 becomes equal to the pressure outside the metal fitting 10. Therefore, by appropriately adjusting the gas pressure, the pressure inside the gap 12 can be controlled to a predetermined pressure.
なお、上記の小孔１１は油止め部１３を形成し
たのちは、油止め部１３の油密性不良が生じた場
合の油漏れを防ぐためビスにより閉塞される。 Note that, after the oil stopper 13 is formed, the small hole 11 is closed with a screw to prevent oil leakage in the event that the oil stopper 13 has poor oil tightness.
この発明は以上のように、加熱管によつてモー
ルドすべき部分を加熱すると同時に加熱管内に不
活性ガス等の圧力媒体を供給し、モールド用金具
に設けた小孔を通じて、その内面とケーブル間の
空隙の圧力をコントロールしながらモールド成形
を行なうので、ケーブルの真円度が十分でなく、
そのためにケーブルとモールド用金具間の空隙の
大きさが不均一であつても、精度のよいモールド
成形ができる。また、従来はモールド材料を加硫
ゴムテープで被覆した状態で加熱していたが、こ
の発明の場合は露出したモールド材料を直接加熱
加圧するので、モールド時間を短縮することがで
きる効果がある。 As described above, this invention heats the part to be molded using the heating tube, simultaneously supplies a pressure medium such as an inert gas into the heating tube, and connects the inner surface of the molding fitting to the cable through the small hole provided in the molding fitting. Since molding is performed while controlling the pressure in the air gap, the cable may not be sufficiently round.
Therefore, even if the size of the gap between the cable and the molding fitting is uneven, accurate molding can be performed. Furthermore, conventionally, the mold material was heated while being covered with a vulcanized rubber tape, but in the case of the present invention, the exposed mold material is directly heated and pressurized, which has the effect of shortening the molding time.
その他、実施例で示すように、モールド材料間
及びその上面に熱収縮性チユーブを被覆すること
により、導電性未加硫ゴムテープ、導電性架橋ポ
リエチレンテープの層間に不活性ガスが侵入する
ことを防止できる。また、圧力媒体として不活性
ガスを用いるため、モールド材料、ケーブル材料
の劣化が少ない利点がある。更に、モールド用金
具の外周にヒータを取付けることにより、ヒータ
の断線等が生じても容易に修理できる利点もあ
る。 In addition, as shown in the examples, inert gas is prevented from entering between the layers of the conductive unvulcanized rubber tape and the conductive cross-linked polyethylene tape by covering the space between the mold materials and the top surface with a heat-shrinkable tube. can. Furthermore, since an inert gas is used as the pressure medium, there is an advantage that the mold material and cable material are less likely to deteriorate. Furthermore, by attaching the heater to the outer periphery of the mold fitting, there is an advantage that even if the heater breaks, it can be easily repaired.
第１図は先行例を示すケーブル終端接続部の断
面図、第２図は従来の油止め形成方法を示す断面
図、第３図はこの発明の実施例の断面図、第４図
は第３図Ｘ−Ｘ線の断面図、第５図は油止め部の
断面図である。
１０…モールド用金具、１１…小孔、１２…空
隙、１３…油止め部、１４…導電性未加硫ゴムテ
ープ、１５，１７…導電性熱収縮チユーブ、１６
…導電性架橋ポリエチレンテープ、１８…加熱
管、２１…ヒータ、２２…パツキング、２３…押
え板、２４…導入管。
FIG. 1 is a sectional view of a cable end connection part showing a prior example, FIG. 2 is a sectional view showing a conventional oil stopper forming method, FIG. 3 is a sectional view of an embodiment of the present invention, and FIG. FIG. 5 is a cross-sectional view of the oil stopper section taken along the line XX in FIG. 10... Mold fitting, 11... Small hole, 12... Gap, 13... Oil stopper, 14... Conductive unvulcanized rubber tape, 15, 17... Conductive heat shrink tube, 16
... Conductive crosslinked polyethylene tape, 18... Heating tube, 21... Heater, 22... Packing, 23... Pressing plate, 24... Introducing tube.
Claims (1)
はめ、その金具の各端部とケーブル間に導電性モ
ールド材料を巻き付け、その巻き付け部を含むケ
ーブルの囲りに加熱管を気密にはめ、加熱管を加
熱すると共に内部に圧力媒体を供給し、前記モー
ルド用金具に設けた小孔により金具内面とケーブ
ル間の空隙の圧力をコントロールしながら上記材
料をモールド成形することを特徴とする電力ケー
ブルにおける終端接続部油止め部の形成方法。 ２ 上記導電性モールド材料を、下から順に導電
性未加硫ゴムテープ、導電性熱収縮チユーブ、導
電性架橋ポリエチレンテープ及び導電性熱収縮チ
ユーブとしたことを特徴とする特許請求の範囲第
１項に記載の電力ケーブルにおける終端接続部油
止め部の形成方法。 ３ 上記加熱管の加熱を、その外周面に取付けた
ヒータにより行なうことを特徴とする特許請求の
範囲第１項に記載の電力ケーブルにおける終端接
続部油止め部の形成方法。[Claims] 1. A pipe-shaped molding fitting is fitted around the cable, a conductive molding material is wrapped between each end of the fitting and the cable, and a heating tube is placed around the cable including the wrapped portion. It is characterized by molding the above-mentioned material while airtightly fitting the heating tube, heating the heating tube, supplying a pressure medium inside, and controlling the pressure in the gap between the inner surface of the metal fitting and the cable through small holes provided in the molding metal fitting. A method for forming an oil stopper at a terminal connection in a power cable. 2. Claim 1, characterized in that the conductive molding material is, in order from the bottom, a conductive unvulcanized rubber tape, a conductive heat-shrinkable tube, a conductive cross-linked polyethylene tape, and a conductive heat-shrinkable tube. A method for forming an oil stopper at a terminal connection in the power cable described above. 3. A method for forming an oil stopper at a terminal connection portion in a power cable according to claim 1, wherein the heating tube is heated by a heater attached to the outer circumferential surface of the heating tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2117881A JPS57135608A (en) | 1981-02-12 | 1981-02-12 | Method of forming terminal connector oil stopper in power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2117881A JPS57135608A (en) | 1981-02-12 | 1981-02-12 | Method of forming terminal connector oil stopper in power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57135608A JPS57135608A (en) | 1982-08-21 |
| JPH0140575B2 true JPH0140575B2 (en) | 1989-08-30 |
Family
ID=12047676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2117881A Granted JPS57135608A (en) | 1981-02-12 | 1981-02-12 | Method of forming terminal connector oil stopper in power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57135608A (en) |
-
1981
- 1981-02-12 JP JP2117881A patent/JPS57135608A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57135608A (en) | 1982-08-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4084307A (en) | Method of joining two cables with an insulation of cross-linked polyethylene or another cross linked linear polymer | |
| US4145176A (en) | Cable molding apparatus for accomplishing same | |
| JPH0475604B2 (en) | ||
| JPS6362971B2 (en) | ||
| US4681985A (en) | Premolded mechanically prestressed voltage stress control cones for high voltage cables and method of fabricating same | |
| US4032380A (en) | Method of joining of insulated high-voltage cables | |
| FI60624C (en) | FOERFARANDE FOER RETABLERING AV ISOLERINGEN VID SKARVNING AV KABLAR SPECIELLT HOEGSPAENNINGSKABLAR | |
| JPH0137834B2 (en) | ||
| FI66999B (en) | SAETT VIDAR SCARVES AV EN CABLE WITH ISOLERING AV TVAERBUNDEN POYETEN ELLER ANNAN TVAERBUNDEN POLYMER | |
| JPS6031197Y2 (en) | Molding equipment for plastic insulated cable connections | |
| JP2900096B2 (en) | Manufacturing method of rubber and plastic moldings | |
| JPS6036376B2 (en) | How to connect cross-linked polyethylene cable | |
| JPH0222251Y2 (en) | ||
| JP2586372Y2 (en) | Bridge device for power cable connection | |
| JPH0151858B2 (en) | ||
| JPS6215985Y2 (en) | ||
| JPH08273791A (en) | Molding method for inner semiconducting layer of rubber-plastic insulated cable connection | |
| JPH0132311Y2 (en) | ||
| JPS5933129Y2 (en) | Bushings for wall penetration in cryogenic electrical equipment | |
| JPS6313667Y2 (en) | ||
| JPH0574911B2 (en) | ||
| JPS6337468B2 (en) | ||
| JPS6326952Y2 (en) | ||
| JPH0644056Y2 (en) | Mold equipment for connecting power cables | |
| JPH03118707A (en) | Method of forming cable connection part |