JPH0137810B2 - - Google Patents
Info
- Publication number
- JPH0137810B2 JPH0137810B2 JP55124421A JP12442180A JPH0137810B2 JP H0137810 B2 JPH0137810 B2 JP H0137810B2 JP 55124421 A JP55124421 A JP 55124421A JP 12442180 A JP12442180 A JP 12442180A JP H0137810 B2 JPH0137810 B2 JP H0137810B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- metal sheath
- gas
- cable
- impregnated
- 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
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- 239000004020 conductor Substances 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 claims description 5
- 240000005572 Syzygium cordatum Species 0.000 description 15
- 235000006650 Syzygium cordatum Nutrition 0.000 description 15
- 239000012212 insulator Substances 0.000 description 9
- 230000005684 electric field Effects 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Landscapes
- Insulated Conductors (AREA)
Description
【発明の詳細な説明】
本発明は耐高電圧用のSF6ガス含浸ケーブルに
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an SF 6 gas impregnated cable for high voltage use.
CVケーブル（架橋ポリエチレン絶縁ビニルシ
ースケーブル）は浸水下で使用するとケーブル内
の架橋ポリエチレン絶縁体に水トリーが生じて次
第に絶縁破壊電圧が低下してくる。この水トリー
は各種の要因に支配されるが、最も基本的なこと
は絶縁体中の水分によるものである。 When CV cables (cross-linked polyethylene insulated vinyl sheathed cables) are used under water, water trees form in the cross-linked polyethylene insulation inside the cables, gradually reducing the dielectric breakdown voltage. This water tree is controlled by various factors, but the most basic one is moisture in the insulator.
それで、CVケーブルにSF6ガスを含浸して電
気トリーの発生を抑え絶縁性能を改良することが
試みられているが、この構造の場合にケーブル中
に多量の水分を含んでいると、ボータイ状水トリ
ーが生じ電気トリー劣化を生じる前に水トリー劣
化を起こしてしまうという問題があつた。 Therefore, attempts have been made to impregnate CV cables with SF 6 gas to suppress the generation of electrical trees and improve insulation performance. There was a problem in that the water tree deteriorated before the water tree occurred and the electric tree deteriorated.
第１図はCVケーブルにおけるボータイ状水ト
リーの発生電界と相対湿度との関係を示す線図
で、実線ａは従来の普通のCVケーブルの場合、
破線ｂは従来のSF6ガス含浸CVケーブルの場合
を示している。図から明らかなように、ボータイ
状水トリーの発生電界は、普通のCVケーブルの
場合とSF6ガス含浸CVケーブルの場合とを比較
して大差がない。従つて、SF6ガスを含浸させる
ことによつてボータイ状水トリーを抑止するとい
う効果は期待できないことになる。すなわち、従
来のSF6ガス含浸CVケーブルは超高圧の大電力
輸送に用いて電気トリーの発生を生じ難いという
特性を有する一方、水トリーの抑止効果は期待で
きないという欠点を有している。 Figure 1 is a diagram showing the relationship between the electric field generated by bowtie-shaped water trees and relative humidity in a CV cable, where the solid line a is for a conventional ordinary CV cable.
Dashed line b shows the case of a conventional SF6 gas impregnated CV cable. As is clear from the figure, there is not much difference in the electric field generated by the bowtie water tree when comparing the case of an ordinary CV cable and the case of an SF 6 gas impregnated CV cable. Therefore, impregnation with SF 6 gas cannot be expected to have the effect of suppressing bowtie-like water trees. That is, while the conventional SF 6 gas-impregnated CV cable has the characteristic that it is difficult to generate electric trees when used for ultra-high-voltage, large-power transmission, it has the drawback that it cannot be expected to be effective in suppressing water trees.
本発明の目的は、上記の欠点を除去し、水トリ
ーの発生を抑止できるように構成したSF6含浸
CVケーブルを提供することにある。 The purpose of the present invention is to eliminate the above - mentioned drawbacks and to prevent the occurrence of water trees from occurring.
Our goal is to provide CV cables.
本発明は、中心導体上に内部半導電層、絶縁体
層、外部半導電層、クツシヨン遮蔽層、金属シー
スおよび防蝕層を順次形成し、前記金属シース内
にSF6ガスを含浸させる構造のものにおいて、前
記金属シース内部の相対湿度を常時60％以下に維
持するように構成したことを特徴とするものであ
る。 The present invention has a structure in which an inner semiconducting layer, an insulating layer, an outer semiconducting layer, a cushion shielding layer, a metal sheath, and a corrosion protection layer are sequentially formed on a center conductor, and the metal sheath is impregnated with SF 6 gas. The device is characterized in that the relative humidity inside the metal sheath is always maintained at 60% or less.
ここで、金属シース内部の相対湿度を特に60％
以下に特定する理由は、第１図に記載のボータイ
状水トリーの発生電界と相対湿度との関係に起因
する。即ち、第１図からも明らかな通り、この種
ケーブルにおけるボータイ状水トリーの発生電界
は、その相対湿度が60％を越えた辺りから急激に
低下することが分かつたが、このことはこの種ケ
ーブルにおけるボータイ状水トリーの発生電界
は、その相対湿度を60％以下とすることにより効
果的に高め得ることを意味するにほかならない。
これが相対湿度を特に60％以下に特定する理由で
ある。 Here, the relative humidity inside the metal sheath should be set to 60%.
The reason specified below is due to the relationship between the electric field generated by the bowtie-shaped water tree and the relative humidity shown in FIG. In other words, as is clear from Figure 1, it was found that the electric field generated by the bowtie-shaped water tree in this type of cable decreases rapidly when the relative humidity exceeds 60%; This means that the electric field generated by the bow-tie water tree in the cable can be effectively increased by reducing its relative humidity to 60% or less.
This is why the relative humidity is specifically specified below 60%.
以下、本発明の一実施例を図面に基づいて説明
する。第２図は、本発明のSF6ガス含浸CVケー
ブルの横断面図で、１は導体、２は内部半導電
層、３は絶縁体層、４は外部半導電層、５はクツ
シヨン蔽遮層、６はアルミ被覆あるいはステンレ
ス鋼のコルゲート被覆等の金属シース、７は防蝕
層である。そして、この金属シース６の内側に
SF6ガスを充填し、内部の絶縁体層３、クツシヨ
ン遮蔽層５等にSF6ガスを含浸させてあり、金属
シース内部の相対湿度は常時60％以下に維持され
るようになつている。 Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 2 is a cross-sectional view of the SF 6 gas-impregnated CV cable of the present invention, where 1 is a conductor, 2 is an inner semiconducting layer, 3 is an insulating layer, 4 is an outer semiconducting layer, and 5 is a cushion shielding layer. , 6 is a metal sheath such as aluminum coating or stainless steel corrugated coating, and 7 is a corrosion-resistant layer. And inside this metal sheath 6
It is filled with SF 6 gas, and the internal insulator layer 3, cushion shielding layer 5, etc. are impregnated with SF 6 gas, so that the relative humidity inside the metal sheath is always maintained at 60% or less.
この実施例のSF6ガス含浸CVケーブルはその
製造に際して、先ず、導体１、内部半導電層２、
架橋ポリエチレンよりなる絶縁体層３、および外
部半導電層４よりなるケーブルコアのみを、常温
における相対湿度が約60％以下になるように乾燥
し、その後、このケーブルコア上にクツシヨン遮
蔽層５を施し、さらに、金属シース６を被覆す
る。次に、これを加熱して金属シース６内を乾燥
させた後、乾燥したSF6ガスを金属シース内に充
填して密封し防蝕層７を施す。このように、金属
シース６内の相対湿度を低下させた状態で製造さ
れた実施例のSF6ガス含浸CVケーブルでは金属
シース６が気密を維持して内部の湿度上昇を防ぐ
ので、絶縁体層３におけるボータイ状水トリーの
発生を防止できる。 In manufacturing the SF 6 gas impregnated CV cable of this embodiment, first, a conductor 1, an internal semiconducting layer 2,
Only the cable core consisting of the insulator layer 3 made of cross-linked polyethylene and the outer semiconducting layer 4 is dried so that the relative humidity at room temperature is about 60% or less, and then a cushion shielding layer 5 is formed on this cable core. Then, the metal sheath 6 is coated. Next, after heating this to dry the inside of the metal sheath 6, dry SF 6 gas is filled into the metal sheath, the metal sheath is sealed, and a corrosion-resistant layer 7 is applied. In this way, in the SF 6 gas-impregnated CV cable of the embodiment manufactured with the relative humidity inside the metal sheath 6 reduced, the metal sheath 6 maintains airtightness and prevents an increase in internal humidity, so the insulator layer The occurrence of bow tie-like water tree in 3 can be prevented.
なお、CVケーブルの絶縁体中の相対湿度は、
金属シース内の材料、例えば、絶縁体、半導体遮
蔽層、空隙およびこれらの存在比率等に依存する
ので、これらの材料、特にクツシヨン遮蔽層５に
吸水性の材料を用い、ケーブルコアに金属シース
６を施してから、これらクツシヨン遮蔽層５等の
水分を除去する方法を用いても絶縁体層３中の水
分を除去することができる。 In addition, the relative humidity in the insulation of the CV cable is
Since it depends on the materials in the metal sheath, for example, the insulator, the semiconductor shielding layer, the voids, and their proportions, it is preferable to use water-absorbing materials for these materials, especially the cushion shielding layer 5, and the metal sheath 6 for the cable core. The moisture in the insulator layer 3 can also be removed by using a method of removing moisture from the cushion shielding layer 5 and the like after applying the above.
また、CVケーブルはVnｔ＝Const（Ｖは課電
圧、ｔは課電時間、ｎは定数）という関係で劣化
するといわれ、ｎは一般に９とされているが、絶
縁体層３の劣化を皆無とすればｎ＝∞となるの
で、絶縁体層３の厚さを大幅に低減させることも
可能となる。 Furthermore, it is said that CV cables deteriorate due to the relationship V n t = Const (V is applied voltage, t is applied time, n is a constant), and n is generally taken to be 9, but the deterioration of the insulator layer 3 is If there is none, n=∞, which makes it possible to significantly reduce the thickness of the insulator layer 3.
以上説明したように、本発明のSF6ガス含浸
CVケーブルは電気トリーの発生を抑止し、さら
に、ボータイ状水トリーの発生を抑止することが
できるので、超高圧電力の輸送用として高い信頼
性で実用に供し得るものである。 As explained above, SF 6 gas impregnation of the present invention
Since the CV cable can suppress the generation of electric trees and furthermore the generation of bow-tie water trees, it can be put to practical use with high reliability for the transportation of ultra-high voltage power.
第１図は、CVケーブルのボータイ状水トリー
発生電界と相対湿度との関係を示す線図、第２図
は、本発明の一実施例を説明するためのSF6ガス
含浸CVケーブルの横断面図である。
１：導体、２：内部半導電層、３：絶縁体層、
４：外部半導電層、５：クツシヨン遮蔽層、６：
金属被覆、７：防蝕層。
Fig. 1 is a diagram showing the relationship between the electric field generated by a bowtie water tree in a CV cable and relative humidity, and Fig. 2 is a cross section of a CV cable impregnated with SF 6 gas for explaining an embodiment of the present invention. It is a diagram. 1: conductor, 2: internal semiconducting layer, 3: insulator layer,
4: External semiconducting layer, 5: Cushion shielding layer, 6:
Metal coating, 7: Corrosion protection layer.
Claims (1)
半導電層、クツシヨン遮蔽層、金属シースおよび
防蝕層を順次形成し、前記金属シース内にSF6ガ
スを含浸させる構造のものにおいて、前記金属シ
ース内部の相対湿度を常時60％以下に維持するよ
うに構成したことを特徴とするSF6ガス含浸ケー
ブル。1. A structure in which an inner semiconducting layer, an insulating layer, an outer semiconducting layer, a cushion shielding layer, a metal sheath, and a corrosion-resistant layer are sequentially formed on the center conductor, and SF 6 gas is impregnated into the metal sheath. An SF 6 gas-impregnated cable characterized by being configured to maintain the relative humidity inside the metal sheath at 60% or less at all times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55124421A JPS5749112A (en) | 1980-09-08 | 1980-09-08 | Sf6 gas immersed cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55124421A JPS5749112A (en) | 1980-09-08 | 1980-09-08 | Sf6 gas immersed cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5749112A JPS5749112A (en) | 1982-03-20 |
| JPH0137810B2 true JPH0137810B2 (en) | 1989-08-09 |
Family
ID=14885059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55124421A Granted JPS5749112A (en) | 1980-09-08 | 1980-09-08 | Sf6 gas immersed cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5749112A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS647718U (en) * | 1987-07-01 | 1989-01-17 |
-
1980
- 1980-09-08 JP JP55124421A patent/JPS5749112A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5749112A (en) | 1982-03-20 |
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