JPH0241614A - Disaster preventive laying structure of power cable - Google Patents
Disaster preventive laying structure of power cableInfo
- Publication number
- JPH0241614A JPH0241614A JP63189074A JP18907488A JPH0241614A JP H0241614 A JPH0241614 A JP H0241614A JP 63189074 A JP63189074 A JP 63189074A JP 18907488 A JP18907488 A JP 18907488A JP H0241614 A JPH0241614 A JP H0241614A
- Authority
- JP
- Japan
- Prior art keywords
- disaster prevention
- layer
- energy
- power cable
- 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 6
- 239000011347 resin Substances 0.000 claims abstract description 11
- 229920005989 resin Polymers 0.000 claims abstract description 11
- 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 abstract description 7
- 239000003063 flame retardant Substances 0.000 claims abstract description 7
- 230000002265 prevention Effects 0.000 claims description 58
- 239000002184 metal Substances 0.000 claims description 17
- 238000009434 installation Methods 0.000 claims description 13
- 125000006850 spacer group Chemical group 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000010304 firing Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 230000006378 damage Effects 0.000 description 5
- 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
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 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
- 238000000034 method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000000126 substance Substances 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、特に油入型カケープルのように、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す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] [Industrial Application Field] The present invention relates to the provision of an improved disaster-prevention installation structure for power cable storage, and in particular, the present invention relates to the provision of an improved disaster prevention installation structure for power cable storage. This invention relates to a disaster prevention installation structure whose main purpose is to prevent fires caused by ignition of leaked oil.
従来、電力ケーブル特に油入型カケープルの地絡による
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-immersed 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を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、■ 電カケーブー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バイブ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 released from the power cable during a ground fault, or by providing a reversible pressure relief cover in the same trough, the energy during a ground fault can be actively released outside the trough and 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 boule prevents the broken part from scattering at the break point due to a ground fault accident, and also seals the cable break port. ■ A power cable is laid inside a vibrator that is flame-retardant and strong, such as one made of FRP, which minimizes the supply of oxygen and promotes the cooling effect on oil spilled in an accident and suppresses ignition. , 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
生エネ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 those made of FRP are hard and have no elasticity, so if the energy generated in the event of a ground fault increases, 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、如上の従来技術における問題点の
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
これを有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 the problems in the above-mentioned conventional technology, the present inventors have determined that the energy generated from the power cable in the event of a ground fault can be reduced by using a disaster prevention trough, pipe, or tape that covers the power cable. It has been found that these substances do not have the ability to absorb this effectively.
本発明は、かかる点に鑑み、地絡事故時に発生するエネ
ルギーが太き（なってもこれを有効に吸収若しくは十分
に低減し、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 this point, the present invention is capable of effectively absorbing or sufficiently reducing the energy generated during a ground fault accident, thereby fully exhibiting the intended disaster prevention effect. , is intended to provide this type of disaster prevention installation structure.
上記課題を解決するための本発明の防災布設構造は、電
力ケーブルの周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 in a cylindrical shape with a gap between the circumferences of a power cable via a spacer, and the side edges are aligned. A primary disaster prevention layer is formed by overlapping and bonding in a non-sealed state, and a flame-retardant and elastic resin sheet is attached vertically in a cylindrical shape with a gap therebetween via a spacer on top of the primary disaster prevention layer. A secondary disaster prevention layer is formed by overlapping and sealingly bonding the same, and the secondary disaster prevention layer is composed of a plurality of layers separated from each other with spacers interposed therebetween.
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 next 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、電力ケーブルが地
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行われる。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。In the above-mentioned disaster prevention installation structure, if a power cable is destroyed due to a ground fault, the energy from the breakage point is stopped by the metal tape that constitutes the primary disaster prevention layer, and the energy is dispersed and absorbed. be exposed. 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 reduced by expansion and deformation due to its own elasticity, and the metal tape When the nearest innermost secondary disaster prevention layer ruptures, the pressure is reduced by the secondary disaster prevention layer located outside of it due to its own expansion and deformation.
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、軽微なもので済め、破裂の危険性が殆ど
無くなる。Since the pressure reduction at this time is for the remainder of the energy that has been absorbed considerably through the inner layers of the primary disaster prevention layer and the secondary disaster prevention layer, it is only slight, and there is almost no risk of rupture.
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じ込めること
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 trapped 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ケーブルよりなる電力ケ
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、さらに３が樹脂シートによる内層４と外層
５とからなる一次防災層である。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 an ultra-high voltage OF cable, 2 is a primary disaster prevention layer made of vertically attached metal tape, and 3 is a primary disaster prevention layer made of an inner layer 4 and an outer layer 5 made of resin sheets. .
シカシて、−次防災層２は、ステンレス鋼製テプのよう
に非磁性であって高い強度を有する金属テープ２１を用
いてこれを電ノｊケーブル１の下側から扇形のスペーサ
６を介して縦添し、そして電力ケーブル１の周りに間隙
７を有する状態で円筒状に丸め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。Then, the next disaster prevention layer 2 is made by using a metal tape 21 that is non-magnetic and has high strength, such as stainless steel tape, and passing it from the underside of the electric cable 1 through a fan-shaped spacer 6. The power cables are arranged vertically, and are rolled into a cylindrical shape with a gap 7 around the power cable 1, and the upper side edges are overlapped and joined together so as not to be sealed together by adhesive, rehesoring, or clips. ing.
一方、二次防災Ｎ３は、Ｍ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の周上に放射状に突設したス
ペーサ８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９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は、その内層４の同上
に上述したと同様に放射状に突設されたスペーサ８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上側で接着剤により完全
密閉結合し、もって二重の層を間隙１０を介して構成し
である。On the other hand, the secondary disaster prevention layer N3 uses a flame-retardant and elastic resin sheet 31 like the M flammable rubber sheet, and the inner layer 4 is formed by protruding radially on the circumference of the secondary disaster prevention layer 2. It is attached vertically from below via a spacer 8, and is rolled into a cylindrical shape with a gap 9 around the primary disaster prevention layer 2, overlapping the side edges on the upper side and bonding with adhesive so as to completely seal each other. The other outer layer 5 is vertically attached to the inner layer 4 from below through the spacers 8 which protrude radially in the same manner as described above, and has a gap 10 around the inner layer 4. It is rolled into a cylindrical shape and completely hermetically joined with adhesive on the upper side, thereby forming a double layer with a gap 10 in between.
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
ルギーにより一次防災層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行われる。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２１に
対するダメージが少なくなるようになっている。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 primary disaster prevention layer 2 due to the energy released from the break point. Depending on the strength, the reception is stopped and the ground fault energy is dispersed and absorbed. At this time, since the joining portions of the side edges are in a non-sealed state, they become slightly bent when internal pressure is applied, and damage to the metal tape 21 is reduced.
しかして、地絡エネルギーが相当に大きい場合には、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。放出
されたエネルギーは、二次防災層３における内Ｎ４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。If the ground fault energy is considerable, the non-sealed joint will rupture and the energy will be released to the outside before the metal tape is destroyed. The released energy is absorbed by reducing the pressure in the inner N4 and outer layer 5 of the secondary disaster prevention layer 3 by expanding and deforming themselves due to internal pressure.
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上にすることも
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 addition, in the above example, the primary disaster prevention layer is 1-layer and the secondary disaster prevention layer is 3-layer, but depending on the magnitude of the energizing voltage and installation conditions, the secondary disaster prevention layer may be 3-layer or higher. Also, by reinforcing the secondary disaster prevention layer with metal tape (double wrapping, etc.), a structure with high earth fault energy absorption and disaster prevention effects can be obtained.
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、地絡エネルギーの吸収が」−
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
、もつ所期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、電力ケーブ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Ｎ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, the power cable disaster prevention installation structure of the present invention can absorb ground fault energy.
This method suppresses ignition from the power cable breakage point and achieves the desired disaster prevention effect.In addition, since it uses metal tape and resin sheets vertically, it is possible to prevent the power cable from being laid. It can be easily constructed on site, and combined with the reduction in disaster prevention installations to N units, it 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、６．８はスペーサ、７，９
及び１０は間隙、２１は金属テープ、３１は樹脂シート
である。
１：電カッアープ・し
２ニーシンで１しと１災ノシ９
３：二次防災層
４：白眉
Ｓ：外層
６．８；
スペーサ
７．９
１０：間晩
２じ令忌テーア
３１：本は脂シ一ト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, 6.8 is a spacer, 7, 9
10 is a gap, 21 is a metal tape, and 31 is a resin sheet. 1: Denkaap・shi 2 Nishin 1 Shito 1 Disaster 9 3: Secondary Disaster Prevention Layer 4: Hakubi S: Outer Layer 6.8; Spacer 7.9 10: Night 2 Ji Rei Tea 31: Books are Greasy Sheet
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. 1. A disaster prevention installation structure for power cables, comprising: a secondary disaster prevention layer formed using a plurality 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 |
|---|---|---|---|
| JP63189074A JPH0241614A (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 |
|---|---|---|---|
| JP63189074A JPH0241614A (en) | 1988-07-28 | 1988-07-28 | Disaster preventive laying structure of power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0241614A true JPH0241614A (en) | 1990-02-09 |
Family
ID=16234870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63189074A Pending JPH0241614A (en) | 1988-07-28 | 1988-07-28 | Disaster preventive laying structure of power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0241614A (en) |
-
1988
- 1988-07-28 JP JP63189074A patent/JPH0241614A/en active Pending
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