JPH0241615A - Disaster preventive laying structure of power cable - Google Patents
Disaster preventive laying structure of power cableInfo
- Publication number
- JPH0241615A JPH0241615A JP63189075A JP18907588A JPH0241615A JP H0241615 A JPH0241615 A JP H0241615A JP 63189075 A JP63189075 A JP 63189075A JP 18907588 A JP18907588 A JP 18907588A JP H0241615 A JPH0241615 A JP H0241615A
- Authority
- JP
- Japan
- Prior art keywords
- disaster prevention
- layer
- power cable
- energy
- prevention layer
- 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.)
- Pending
Links
- 230000003449 preventive effect Effects 0.000 title abstract 7
- 239000011347 resin Substances 0.000 claims abstract description 10
- 229920005989 resin Polymers 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 5
- 230000002265 prevention Effects 0.000 claims description 58
- 239000002184 metal Substances 0.000 claims description 19
- 238000009434 installation Methods 0.000 claims description 13
- 125000006850 spacer group Chemical group 0.000 claims description 10
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 7
- 239000003063 flame retardant Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 2
- 238000010304 firing Methods 0.000 abstract 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 9
- 230000006378 damage Effects 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000004709 eyebrow Anatomy 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電力ケーブルのだめの改良された防災布設構
造の提供に関し、特に油入電力ケーブルのように、地絡
時のエネルギーによって油が漏洩したりその漏洩した油
に引火して火災が発生ずるのを防止することを主眼とし
た防災布設構造に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the provision of an improved disaster prevention installation structure for a power cable sump, and in particular, the present invention relates to the provision of an improved disaster prevention installation structure for a power cable sump. This invention relates to a disaster prevention installation structure whose main purpose is to prevent leaked oil from igniting and causing a fire.
従来、電力ケーブル特に油入電力ケーブルの地絡による
災害を防止するために次に示す防災構造が採用されてい
た。Conventionally, the following disaster prevention structure has been adopted to prevent disasters caused by ground faults in power cables, especially oil-filled power cables.
■ ＦＲＰ製の防災トラフ内に電力ケーブルを布設し、
地絡時に電力ケーブルから放出されるエネルギーを閉じ
込めるか、または同トラフに可逆性の放圧カバーを設け
るかして、地絡時のエネルギーヲトラフの外に積極的に
放出させ、地絡後のトラフ内を酸欠状態にして発火の抑
制を図るもの、■ 電力ケーブルの周上に防災テープを
巻き付は地絡事故による破壊点での破損部の飛散を防止
するとともに、ケーブル破壊口を密閉して酸素の供給を
最小限にし、事故により流出する油への冷却効果を促す
とともに発火を抑制するもの、■ ＦＲＰ製の如く難燃
性で而も強度の大きいパイプ内に電力ケーブルを布設し
、地絡時のエネルギーによるケーブル破壊を最小限に食
い止め、酸欠状態にして発火を抑制するもの。■ Power cables are laid inside the FRP disaster prevention trough,
By trapping the energy emitted from the power cable during a ground fault, or by providing a reversible pressure release cover on the trough, the energy can be actively released outside the trough during a ground fault. A device that suppresses ignition by creating an oxygen-deficient condition inside the trough.■ Wrapping disaster prevention tape around the circumference of the power cable prevents the broken part from scattering at the point of breakage due to a ground fault, and also seals the cable breakage port. - Minimize the supply of oxygen, promote the cooling effect on oil spilled in an accident, and suppress ignition. ■ Lay the power cable inside a flame-retardant and strong pipe such as one made of FRP. , which minimizes cable damage caused by energy during ground faults and prevents fire by creating an oxygen-deficient state.
■■のもののようにＦＲＰ製のトラフ、パイプでは、硬
質で弾性を有していないことに起因して地絡事故時の発
生玉名ルギーが大きくなると破損が著しくなり、また、
放圧機構の動作も十分とは言えず、発火抑制の点からは
問題があった。FRP troughs and pipes like the ones in ■■ are hard and have no elasticity, so if the damage caused by a ground fault becomes large, the damage will be significant.
The operation of the pressure relief mechanism was also insufficient, and there were problems in terms of suppressing ignition.
また、■のように防災テープを巻き付けたものでは、地
絡事故時のエネルギーが大きいとテープに与えるダメー
ジ（破壊）が大きくなり、ケーブル破壊口を十分に覆う
ことが難しくなって、期待する程の防災効果が得られな
い。In addition, with a disaster prevention tape wrapped as shown in ■, if the energy at the time of a ground fault is large, the damage (destruction) inflicted on the tape will be large, making it difficult to sufficiently cover the cable breakage opening, making it less than expected. Disaster prevention effects cannot be obtained.
そこで本発明者等は、如」二の従来波（ネｉにおける問
題点の要因を鋭意探究した結果、電力ケーブルに対して
周囲を覆う防災トラフ、パイプ若しくはテープにおいて
、地絡事故時に電力ケーブルから発生するエネルギーに
対してこれをを効に吸収する機能を有していないことを
見出した。As a result of intensive investigation into the causes of problems with conventional waves, the inventors of the present invention have found that, in the disaster prevention trough, pipe, or tape that covers the power cable, it is possible to remove the power cable from the power cable in the event of a ground fault. It was discovered that the metal does not have the ability to effectively absorb the energy generated.
本発明は、かかる点に鑑み、地絡事故時に発生ずるエネ
ルギーが大きくなってもこれを有効に吸収若しくは十分
に低減し且つ発火抑制効果を十分にし、もって所期の防
災効果を十二分に発揮することのできる、この種防災布
設構造の提供を目的としたものである。In view of these points, the present invention effectively absorbs or sufficiently reduces the energy generated in the event of a ground fault even if it becomes large, and has a sufficient ignition suppressing effect, thereby fully achieving the desired disaster prevention effect. The purpose of this project is to provide this type of disaster prevention installation structure that is capable of achieving the desired effect.
上記課題を解決するための本発明の防災布設構造は、電
力ケーブルの同上に非磁性で強度の高い金属テープをス
ペーサを介して間隙を有する状態で筒状に縦添装着し且
つ側縁同志を重ねて非密閉状態で結合して形成された一
次防災層と、その上に難燃性且つ弾性を有する樹脂シー
トをスペーサを介して間隙を有する状態で筒状に縦添装
着し且つ側縁同志を重ねて密閉結合して形成された二次
防災層とを備え、当該層カケープルと一次防災層との間
隙には不燃性繊維の緩衝層を設け、また二次防災層はス
ペーサを介して離間しあう複数の層からなるものである
。In order to solve the above problems, the disaster prevention installation structure of the present invention is such that a non-magnetic, high-strength metal tape is attached vertically to the top of the power cable in a cylindrical shape with a gap between them via a spacer, and the side edges are connected to each other. A primary disaster prevention layer is formed by stacking and bonding in a non-sealing state, and a flame-retardant and elastic resin sheet is attached vertically in a cylindrical shape with a gap therebetween via a spacer, and the side edges are aligned. and a secondary disaster prevention layer formed by overlapping and sealingly bonding, a buffer layer of non-combustible fiber is provided in the gap between the layer capeple and the primary disaster prevention layer, and the secondary disaster prevention layer is separated via a spacer. It consists of multiple layers that overlap each other.
かかる−次防災層に使用する金属テープは、ステンレス
鋼製テープが好ましい部材である。また二次防災層に使
用する樹脂シートは、難燃性ゴムシートが好ましい部材
である。しかして、金属テープや樹脂シートは、それら
に求められる性能を満足するものであれば上記以外の材
料を使用して形成したものであっても良い。The metal tape used for this secondary disaster prevention layer is preferably a stainless steel tape. Moreover, the resin sheet used for the secondary disaster prevention layer is preferably a flame-retardant rubber sheet. However, the metal tape and resin sheet may be formed using materials other than those mentioned above, as long as they satisfy the performance required of them.
上記のような防災布設構造において、電カケプルが地絡
事故により破壊した場合には、その破壊点からのエネル
ギーが緩衝層で吸収され且つ一次防災層を構成する金属
テープで受は止められて当該エネルギーの分散吸収がさ
らに行われる。In the above-mentioned disaster prevention installation structure, if the electric cable pull is destroyed due to a ground fault, the energy from the breakage point is absorbed by the buffer layer, and the metal tape constituting the primary disaster prevention layer stops the receiver. A further dispersive absorption of energy takes place.
そして膨大な地絡エネルギーにより一次防災層にかかる
内圧が相当に大きい場合には、当該層を構成する金属テ
ープが破壊される前にそれ自身の側縁同志の重ね結合部
から破裂するようになる。当該−次防災層の破裂により
さらに外側に向かうエネルギーは、二次防災層を構成す
る樹脂シートで受は止められ、シートにかかる内圧は、
それ自身の弾性による膨張変形により低減され、金属テ
ープに最も近い最内層の二次防災層が破裂した場合には
、その外側にある二次防災層で自己の膨張変形による圧
力低減が行われる。この時の圧力低減は一次防災層及び
二次防災層の内層を経て相当に吸収されたエネルギーの
残余の分に対するものであるため、軽微なもので済み、
破裂の危険性が殆ど無くなる。If the internal pressure applied to the primary disaster prevention layer due to the huge amount of ground fault energy is considerable, it will burst from the lap joints between its own side edges before the metal tape that makes up the layer is destroyed. . The energy directed outward due to the rupture of the secondary disaster prevention layer is stopped by the resin sheet that constitutes the secondary disaster prevention layer, and the internal pressure applied to the sheet is
The pressure is reduced by expansion and deformation due to its own elasticity, and if the innermost secondary disaster prevention layer closest to the metal tape ruptures, the pressure is reduced by the expansion and deformation of the secondary disaster prevention layer located outside. The pressure reduction at this time is only slight because it corresponds to the residual amount of energy that has been absorbed through the inner layers of the primary disaster prevention layer and the secondary disaster prevention layer.
The risk of rupture is almost eliminated.
そして、電力ケーブルの破壊点から漏出する油は二次防
災層における内層若しくはその上の層に閉し込めること
ができ、もって外部に流出して発火するのが防止される
。The oil leaking from the break point of the power cable can be contained in the inner layer of the secondary disaster prevention layer or the layer above it, thereby preventing it from leaking outside and igniting.
なお、金属テープは非磁性であるため、電力ケーブルか
らの誘導による渦電流損が無く、発熱が抑えられる。Note that since the metal tape is non-magnetic, there is no eddy current loss due to induction from the power cable, and heat generation is suppressed.
添付図面は、超高圧ＯＦケーブルの如き電力ケーブルを
対象とした防災布設構造の一実施例を示したものである
。図において、１が超高圧ＯＦケプルよりなる電力ケー
ブルであり、２が金属テープの縦添装着による一次防災
層であり、また３が樹脂シートによる内層４と外層５と
からなる次防災層、さらに６が不燃性繊維の緩衝層であ
る。The attached drawings show an example of a disaster prevention installation structure for power cables such as ultra-high voltage OF cables. In the figure, 1 is a power cable made of ultra-high voltage OF Keple, 2 is a primary disaster prevention layer made of vertically attached metal tape, 3 is a secondary disaster prevention layer consisting of an inner layer 4 and an outer layer 5 made of resin sheets, and 6 is a buffer layer made of nonflammable fibers.
しかして、−次防災層２は、ステンレス鋼製テープのよ
うに非磁性であって高い強度を有する金属チー１２１を
用いてこれを電力ケーブル１の下側から扇形のスペーサ
７を介して縦添し、そして電力ケーブル１の周りに間隙
８を有する状態で円筒状に丸め、間隙８０部分に不燃性
繊維からなる緩衝層６を充填し、その後で上側にある側
縁同志を重ねて接着剤、リヘソト止め或いはクリップ止
めにより密閉しあわないように結合して構成されている
。Therefore, the secondary disaster prevention layer 2 is made by using a metal chip 121 that is non-magnetic and has high strength, such as a stainless steel tape, and vertically attaches it from the bottom of the power cable 1 via a fan-shaped spacer 7. Then, the power cable 1 is rolled into a cylindrical shape with a gap 8 around it, and the gap 80 is filled with a buffer layer 6 made of non-combustible fibers, and then the upper side edges are overlapped and adhesive is applied. They are connected to each other by reshaping or clips so as not to seal each other.
一方、二次防災層３は、難燃性ゴムシートのように難燃
性且つ弾性を有する樹脂シート３１を用いており、内層
４は、かかる−次防災層２の同上に放射状に突設したス
ペーサ９を介して下側から縦添しそして一次防災層２の
周囲に間隙１０を有する状態で円筒状に丸め上側におい
て側縁同志を重ねて接着剤により完全に密閉しあうよう
に結合して構成され、他方の外層５ば、その内層４の周
上に上述したと同様に放射状に突設されたスペサ９を介
して下側から縦添し、そして内層４の周囲に間隙１０を
有する状態で円筒状に丸め且つ」二側で接着剤により完
全密閉結合し、もって二重の層を離間しつつ構成しであ
る。On the other hand, the secondary disaster prevention layer 3 uses a flame-retardant and elastic resin sheet 31 like a flame-retardant rubber sheet, and the inner layer 4 is formed by protruding radially from above the secondary disaster prevention layer 2. It is attached vertically from the lower side via a spacer 9, and is rolled into a cylindrical shape with a gap 10 around the primary disaster prevention layer 2. The side edges are overlapped on the upper side and bonded with adhesive so as to completely seal each other. The other outer layer 5 is vertically attached from below via spacers 9 protruding radially on the circumference of the inner layer 4 in the same manner as described above, and has a gap 10 around the inner layer 4. It is formed by rolling it into a cylindrical shape and completely sealingly joining the two sides with adhesive, thereby separating the double layer.
本実施例の防災構造において、地絡事故により電力ケー
ブルに破壊点が生した際には、そこから放出されるエネ
ルギーにより緩衝層６及び−次防災層２における金属テ
ープ２１に内圧が加わるが、当該緩衝層６によるエネル
ギーの吸収が図られ、さらに金属テープの高い強度によ
り受は止め、そして地絡エネルギーの分散吸収が十分に
行われる。In the disaster prevention structure of this embodiment, when a break point occurs in the power cable due to a ground fault, internal pressure is applied to the metal tape 21 in the buffer layer 6 and the second disaster prevention layer 2 due to the energy released from the break point. The energy is absorbed by the buffer layer 6, and the high strength of the metal tape prevents the energy from being absorbed, and the ground fault energy is sufficiently dispersed and absorbed.
その時側縁同志の結合部分は非密閉状態であるため、内
圧が加わった際に若干法がるようになり、金属テープ２
１に対するダメージが少なくなるようになっている。At that time, since the joints between the side edges are not sealed, they will bend slightly when internal pressure is applied, and the metal tape 2
The damage against 1 is now reduced.
しかして、地絡エネルギーが相当に大きく緩衝層６で吸
収しきれない場合には、金属テープが破壊される前にか
かる非密閉状態の結合部分から破裂して外側へのエネル
ギー放出がなされる。If the ground fault energy is too large to be absorbed by the buffer layer 6, the non-sealed joint will rupture and the energy will be released to the outside before the metal tape is broken.
放出されたエネルギーは、二次防災層３における内層４
及び外層５において内圧による自己の膨張変形により圧
力の低減を図り、エネルギーの吸収が行われる。The released energy is transferred to the inner layer 4 of the secondary disaster prevention layer 3.
In the outer layer 5, pressure is reduced by self-expansion and deformation due to internal pressure, and energy is absorbed.
電力ケーブル１の破壊点から漏出する油は、側縁同志が
完全密閉しあった二次防災層３の内層４或いは外層にお
いて閉じ込められ、引火の危険性を排除するものである
。Oil leaking from the break point of the power cable 1 is trapped in the inner layer 4 or outer layer of the secondary disaster prevention layer 3 whose side edges are completely sealed together, eliminating the risk of ignition.
なお、以上の実施例では、−重の一次防災層と二層の二
次防災層を例にしているが、通電電圧の大きさや布設条
件等によっては、二次防災層を三重それ以」二にするこ
とも可能であり、また−次防災層を金属テープの増強（
二重巻き等）を行って地絡エネルギー吸収及び防災効果
の大きい構造を得ることができる。In the above embodiments, the primary disaster prevention layer is 1-layer and the secondary disaster prevention layer is 2 layers, but depending on the magnitude of the energizing voltage, installation conditions, etc. It is also possible to strengthen the next disaster prevention layer with metal tape (
Double winding, etc.) can be used to obtain a structure that is highly effective in absorbing ground fault energy and preventing disasters.
なおまた、−次防災層と二次防災層の最内層との間及び
二次防災層における内外層間の間隙には、空隙であって
も良いが、消火剤を充填して油の発火抑制効果を高める
工夫も可能である。Furthermore, the gaps between the secondary disaster prevention layer and the innermost layer of the secondary disaster prevention layer and the gaps between the inner and outer layers of the secondary disaster prevention layer may be filled with a fire extinguishing agent to suppress the ignition of oil. It is also possible to devise ways to increase this.
以上説明して来て明らかなように、本発明の電力ケーブ
ル防災布設構造によれば、地絡エネルギの吸収が十分に
行われ且つ電力ケーブル破壊口からの発火を抑制し、も
つ所）…の防災効果が得られるものであり、また、金属
テープの縦添装着及び樹脂シートの縦添装着によるため
、電カケーフル布設現場で簡単に構築することが可能で
あり、防災布設施工の簡単化とあいまってトータルコス
トの低減に資することができる。等々実用上の効果は大
きい。As is clear from the above explanation, according to the power cable disaster prevention installation structure of the present invention, ground fault energy can be sufficiently absorbed and ignition from the power cable breakage port can be suppressed. It has a disaster prevention effect, and since it uses metal tape and resin sheets vertically attached, it can be easily constructed at the installation site for electric cable fulls, which also simplifies the construction of disaster prevention cables. This can contribute to reducing total costs. The practical effects are great.
添付図面は、本発明にかかる電力ケーブル防災布設構造
の一実施例を示す横断面的説明図である。
図中、１は電力ケーブル、２は一次防災層、３は二次防
災層、４は内層、５は外層、６は緩衝層７．９はスペー
サ、８．１０は間隙、２］ば金属：電力ケーフ゛ル２：
−シ欠防災層
３：ニン、シてｐ之１１１ミノ；１；
４二内／！
Ｓ ： ７トノ静
６４１軒眉
７，９：スベーリ
８．１０：Ｍ晩
２１ン９９１テーフ。
３じ＃脂シ
トThe accompanying drawing is a cross-sectional explanatory diagram showing one embodiment of the power cable disaster prevention installation structure according to the present invention. In the figure, 1 is a power cable, 2 is a primary disaster prevention layer, 3 is a secondary disaster prevention layer, 4 is an inner layer, 5 is an outer layer, 6 is a buffer layer 7. 9 is a spacer, 8. 10 is a gap, 2] metal: Power cable 2:
- Missing disaster prevention layer 3: 111 min; 1; 4 2/! S: 7, 641, eyebrows 7, 9: Suberi 8.10: M evening 21, 991 teaf. 3rd #fatty shit
Claims (1)
プをスペーサを介して間隙を有する状態で筒状に縦添装
着し且つ側縁同志を重ねて非密閉状態で結合して形成さ
れた一次防災層と、その上に難燃性且つ弾性を有する樹
脂シートをスペーサを介して間隙を有する状態で筒状に
縦添装着し且つ側縁同志を重ねて密閉結合して形成され
た二次防災層とを備え、当該電力ケーブルと一次防災層
との間隙には不燃性繊維からなる緩衝層を有し、また二
次防災層はスペーサを介して離間しあう複数の層からな
ることを特徴とする電力ケーブルの防災布設構造。 ２、上記金属テープがステンレステープからなり、樹脂
シートが難燃性ゴムシートからなる請求項第１項記載の
電力ケーブルの防災布設構造。[Claims] 1. A non-magnetic, high-strength metal tape is vertically attached to the circumference of a power cable with a spacer in between, and the side edges are overlapped to form a non-sealed state. The primary disaster prevention layer is formed by combining the primary disaster prevention layer, and a flame-retardant and elastic resin sheet is attached vertically in a cylindrical shape with a gap therebetween via a spacer, and the side edges are overlapped and hermetically bonded. A buffer layer made of non-combustible fiber is provided in the gap between the power cable and the primary disaster prevention layer, and the secondary disaster prevention layer includes a plurality of layers separated from each other via spacers. A disaster prevention installation structure for power cables characterized by consisting of layers. 2. The disaster prevention installation structure for power cables according to claim 1, wherein the metal tape is made of a stainless steel tape, and the resin sheet is made of a flame-retardant rubber sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63189075A JPH0241615A (en) | 1988-07-28 | 1988-07-28 | Disaster preventive laying structure of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63189075A JPH0241615A (en) | 1988-07-28 | 1988-07-28 | Disaster preventive laying structure of power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0241615A true JPH0241615A (en) | 1990-02-09 |
Family
ID=16234887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63189075A Pending JPH0241615A (en) | 1988-07-28 | 1988-07-28 | Disaster preventive laying structure of power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0241615A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007282333A (en) * | 2006-04-04 | 2007-10-25 | Tokyo Electric Power Co Inc:The | Oil-filled cable connection and method for preventing grounding fault therein |
-
1988
- 1988-07-28 JP JP63189075A patent/JPH0241615A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007282333A (en) * | 2006-04-04 | 2007-10-25 | Tokyo Electric Power Co Inc:The | Oil-filled cable connection and method for preventing grounding fault therein |
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