JP6637404B2 - Water resistant flame retardant non-halogen sheath high voltage cable - Google Patents

Water resistant flame retardant non-halogen sheath high voltage cable Download PDF

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JP6637404B2
JP6637404B2 JP2016231430A JP2016231430A JP6637404B2 JP 6637404 B2 JP6637404 B2 JP 6637404B2 JP 2016231430 A JP2016231430 A JP 2016231430A JP 2016231430 A JP2016231430 A JP 2016231430A JP 6637404 B2 JP6637404 B2 JP 6637404B2
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聖司 曽我部
聖司 曽我部
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Tatsuta Electric Wire and Cable Co Ltd
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    • YGENERAL 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
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Description

この発明は、高い耐水性を有する難燃ノンハロゲンシースの高圧ケーブルに関するものである。   The present invention relates to a flame-retardant non-halogen sheath high-pressure cable having high water resistance.

シースに有機ハロゲン系の難燃材(剤)を添加した難燃性ケーブルは、そのシースが燃焼すると、腐食性ガスや有害なハロゲンガス等が発生し、人体や他の部品などに悪影響を及ぼす。このため、近年、その有機ハロゲン系の難燃材に代えて金属水酸化物等の無機系のノンハロゲン難燃材を添加したシースの難燃性ケーブルが開発されている(特許文献1実用新案登録請求の範囲、第1図、第2図、特許文献2請求項1、2、図1等参照)。   Flame-retardant cables with an organic halogen-based flame-retardant material (agent) added to the sheath generate corrosive gas or harmful halogen gas when the sheath burns, which adversely affects the human body and other parts. . Therefore, in recent years, a flame retardant cable having a sheath in which an inorganic non-halogen flame retardant such as a metal hydroxide is added in place of the organic halogen flame retardant has been developed (Patent Document 1 Registration of Utility Model) Claims, FIG. 1, FIG. 2, Patent Document 2 Claims 1, 2, FIG. 1, etc.).

しかし、その金属水酸化物である、水酸化マグネシウムや水酸化アルミニウム等はOH基をもつ為、空気中や水中の水分を吸湿しやすい性質がある。
このため、そのシースにノンハロゲン難燃材を用いたケーブルは、長時間水没状態に有ると、そのノンハロゲン難燃材が水分を吸湿し、その水分はシース内を浸透して、ケーブルに必要な特性であるシース抵抗を著しく低下させる原因となる。しかし、耐延焼性の要求を満たし、かつ燃焼時、有害なハロゲンガスを発生しないための高圧ケーブルにおいて、その要求等を満たすためにノンハロゲン難燃材を使用する以上、前記水分によるシース抵抗の低下は避けられない問題である。
完全な遮水性が必要な場合には、シース外周面に金属テープ等を設けて遮水層を形成したり(特許文献3図1の符号7参照)、ケーブルの上からコルゲートなどの金属管を被せる等したりして遮水を施している。
However, magnesium hydroxide, aluminum hydroxide, and the like, which are metal hydroxides, have an OH group, and thus have a property of easily absorbing moisture in air or water.
For this reason, when a cable using a non-halogen flame-retardant material for its sheath is immersed in water for a long time, the non-halogen flame-retardant material absorbs moisture, and the moisture penetrates into the sheath, and the characteristics required for the cable , Which significantly reduces the sheath resistance. However, in a high-pressure cable that satisfies the requirement for fire resistance and does not generate harmful halogen gas during combustion, the use of a non-halogen flame-retardant material to meet the requirement, etc. reduces the sheath resistance due to the moisture. Is an unavoidable problem.
When complete water impermeability is required, a metal tape or the like is provided on the outer peripheral surface of the sheath to form a water impervious layer (see reference numeral 7 in FIG. 1 of Patent Document 3), or a metal pipe such as a corrugate is placed over the cable. It is covered with water, etc.

実公昭59−28574号公報Japanese Utility Model Publication No. 59-28574 特開2001−110251号公報JP 2001-110251 A 特開2001−6446号公報JP 2001-6446 A

上記金属テープ等による遮水手段は一般的ではなく、通常、その遮水手段のような完全なる遮水性能が不必要な場合が多い(要求されない)。
また、金属テープ等による遮水手段は金属を使うため、ケーブルが固く重くなり曲げづらくなる等の作業性が著しく悪くなるうえに、ケーブル費用も高くなる傾向にある。さらに、コルゲートにあっては電磁誘導の電気的な問題から単芯には使用できないなど制限事項もある。
The water-blocking means using the above-mentioned metal tape or the like is not common, and in many cases, complete water-blocking performance such as the water-blocking means is not often required (not required).
In addition, since the water-blocking means using a metal tape or the like uses metal, the workability such as the cable becomes hard and heavy and the cable is difficult to bend, and the workability is remarkably deteriorated, and the cable cost tends to increase. Furthermore, corrugates have limitations such that they cannot be used for a single core due to electrical problems of electromagnetic induction.

この発明は、以上の実状の下、難燃ノンハロゲンシースそのものに遮水性を持たせることを課題とする。   An object of the present invention is to provide the flame-retardant non-halogen sheath itself with water barrier under the above-mentioned circumstances.

上記課題を達成するため、この発明は、まず、導体を絶縁体で被覆し、その外周に遮蔽層を形成したケーブルコアの外表面にシースを設けた高圧ケーブルにおいて、前記シースを内外2層として、その外層をノンハロゲン難燃材を添加した難燃低密度ポリエチレンで形成し、内層を耐水性中密度ポリエチレンで形成することとしたのである。
この構成の高圧ケーブルが長時間水没状態に有って、外層内のノンハロゲン難燃材が水分を吸湿して水分がシース内を浸透しても、内層の耐水性中密度ポリエチレンによってその水分は遮断されるため、ケーブルコアの導体に至ることはない。このため、ケーブルに必要な特性であるシース抵抗が低下することはない。
なお、難燃ノンハロゲンシースとするには、従来と同様に、水酸化マグネシウムや水酸化アルミニウム等の金属水酸化物を上記低密度ポリエチレン層に添加する。
因みに、難燃性高圧ケーブルの場合、垂直トレイ試験による高い耐延焼性能が必要となり、ポリエチレンは耐水性、耐薬品性、絶縁抵抗に優れた材であることは知られているが、難燃性がないため、その難燃性を有しないポリエチレンの単体はシースに使用できない。
In order to achieve the above object, the present invention first provides a high-voltage cable in which a conductor is covered with an insulator and a sheath is provided on an outer surface of a cable core having a shielding layer formed on an outer periphery thereof, wherein the sheath is formed as an inner and outer layer. The outer layer is made of flame-retardant low-density polyethylene to which a halogen-free flame retardant is added, and the inner layer is made of water-resistant medium-density polyethylene.
Even if the high-pressure cable of this configuration is submerged for a long time, even if the non-halogen flame-retardant material in the outer layer absorbs moisture and permeates the sheath, the water is blocked by the water-resistant medium-density polyethylene in the inner layer. Therefore, it does not reach the conductor of the cable core. Therefore, the sheath resistance, which is a characteristic required for the cable, does not decrease.
In order to form a flame-retardant non-halogen sheath, a metal hydroxide such as magnesium hydroxide or aluminum hydroxide is added to the low-density polyethylene layer as in the conventional case.
By the way, in the case of flame-retardant high-pressure cables, high fire resistance is required by a vertical tray test, and polyethylene is known to be excellent in water resistance, chemical resistance, and insulation resistance. Therefore, a single piece of polyethylene having no flame retardancy cannot be used for the sheath.

つぎに、難燃低密度ポリエチレンからなる外層は、難燃性を担保するためにはできるだけ、厚いことが好ましく、一方、耐水性中密度ポリエチレンからなる内層は、耐水性に支障が無い限りにおいて、可撓性を担保する点から薄い方が好ましい。このため、上記耐水性中密度ポリエチレン層の厚みtと難燃低密度ポリエチレン層の厚みTの割合を、1/13〜1/9(1/13・T≦t≦1/9・T)としたのである。
なお、特許文献1、2には、導体を被覆する絶縁体を内外2層とし、その外層をノンハロゲン難燃材を添加した低密度ポリエチレンで形成し、内層を高密度ポリエチレンで形成したケーブルが開示されている。しかし、その内外の2層としたのは、抗張力等の物性の向上のためだったり(特許文献1第1頁第25〜29行等参照)、シースの押出成形性の向上のためであったり(特許文献2段落0006等参照)であって、シースの耐水性の向上を目的としたものではない。
Next, the outer layer made of flame-retardant low-density polyethylene is preferably as thick as possible in order to ensure flame retardancy, while the inner layer made of water-resistant medium-density polyethylene is not impaired in water resistance, It is preferable to be thin from the viewpoint of ensuring flexibility. For this reason, the ratio of the thickness t of the water-resistant medium-density polyethylene layer to the thickness T of the flame-retardant low-density polyethylene layer is set to 1/13 to 1/9 (1/13 · T ≦ t ≦ 1/9 · T). It was done.
Patent Documents 1 and 2 disclose a cable in which an insulator covering a conductor is formed of two layers, an inner layer and an outer layer, and the outer layer is formed of low-density polyethylene to which a halogen-free flame retardant is added, and the inner layer is formed of high-density polyethylene. Have been. However, the two inner and outer layers are used to improve physical properties such as tensile strength (see Patent Document 1, page 1, lines 25 to 29), and to improve the extrusion moldability of the sheath. (See paragraph 0006 of Patent Document 2, for example), and is not intended to improve the water resistance of the sheath.

この発明の具体的な一構成としては、導体を絶縁体で被覆し、その外周に遮蔽層を形成したケーブルコアの外表面にシースを設けた高圧ケーブルであって、前記シースを内外2層として、その外層がノンハロゲン難燃材を添加した難燃低密度ポリエチレンで形成されているとともに、内層が耐水性中密度ポリエチレンで形成されており、前記耐水性中密度ポリエチレンの層厚tと難燃低密度ポリエチレンの層厚Tの割合を、1/13〜1/9(1/13・T≦t≦1/9・T)とした構成を採用したのである。
この構成の耐水性難燃ノンハロゲンシース高圧ケーブルは単芯であるが、この単芯ケーブルの複数本、例えば、3本を撚り合わせて複数芯の耐水性難燃ノンハロゲンシース高圧ケーブルとすることもできる。
One specific configuration of the present invention is a high-voltage cable in which a conductor is covered with an insulator and a sheath is provided on the outer surface of a cable core having a shielding layer formed on the outer periphery thereof, wherein the sheath is formed of two layers, inner and outer. The outer layer is made of flame-retardant low-density polyethylene to which a halogen-free flame-retardant material is added, and the inner layer is made of water-resistant medium-density polyethylene. The ratio of the layer thickness T of the density polyethylene was set to 1/13 to 1/9 (1/13 · T ≦ t ≦ 1/9 · T).
Although the water-resistant flame-retardant non-halogen sheathed high-voltage cable having this configuration is a single core, a plurality of, for example, three single-core cables can be twisted to form a multi-core water-resistant flame-retardant non-halogen sheathed high-voltage cable. .

この発明は、以上のように構成したので、金属テープや金属管を使用しないで、シースに従来どおりノンハロゲン難燃材を使用しながら、耐水性能を向上させた高圧ケーブルを得ることができる。   Since the present invention is configured as described above, it is possible to obtain a high-voltage cable having improved water resistance while using a non-halogen flame-retardant material for the sheath as before, without using a metal tape or a metal tube.

この発明に係る耐水性難燃ノンハロゲンシース高圧ケーブルの一実施形態の製作説明用断面図Sectional drawing for explaining the production of one embodiment of the water-resistant flame-retardant non-halogen sheath high-voltage cable according to the present invention. 同他の実施形態及び参考例の断面図Sectional view of another embodiment and reference example 同実施形態及び参考例の耐絶縁試験説明図Explanatory drawing of the insulation resistance test of the embodiment and the reference example

この発明に係る耐水性難燃ノンハロゲンシース高圧ケーブルの一実施形態を図1に示し、この高圧ケーブルPは、電力供給用であって、まず、同図(a)に示すように、導体1aの外周面に銅箔テープを重ね巻き(縦添え)して内部半導電層1bを形成し、その外周に、架橋ポリエチレンを押し出し成形して絶縁層1cを被覆し、さらにその外周面に銅箔テープを重ね巻き(縦添え)して外部半導電層1dを形成し、さらにその外周面に軟銅テープ1eを重ね巻き(縦添え)して、下記シース2を除くケーブルコア1を製作する。 Shows an embodiment of a water-resistant flame-retardant non-halogen sheath high-voltage cable according to the present invention in FIG. 1, the high-voltage cable P 1 is a power supply, first, as shown in FIG. 6 (a), the conductor 1a The inner semiconductive layer 1b is formed by overlapping and winding (longitudinally) a copper foil tape on the outer peripheral surface of the above, and the outer periphery thereof is covered with an insulating layer 1c by extrusion molding of crosslinked polyethylene, and furthermore, the outer peripheral surface is covered with a copper foil. The outer semiconductive layer 1d is formed by lapping (longitudinally) the tape, and the soft copper tape 1e is further wrapped (longitudinally) on the outer peripheral surface thereof to manufacture the cable core 1 excluding the sheath 2 described below.

つぎに、図1(b)に示すように、そのケーブルコア1の外周面に押さえテープ3を重ね巻き(縦添え)した後、耐水性中密度ポリエチレン層(例えば、宇部丸善ポリエチレン株式会社、商品名:UBEポリエチレン UBEC600V6)を押し出し成形し、さらに、その耐水性中密度ポリエチレン層(内層)2bの外周面に金属水酸化物を添加した難燃低密度ポリエチレン(例えば、日本ポリエチレン株式会社、商品名:レクスパールEEA CA1155B)2aを押し出し成形して、内外2層2a、2bのシース2を設けて、この発明に係る耐水性難燃ノンハロゲンシース高圧ケーブルPとする。 Next, as shown in FIG. 1 (b), after the holding tape 3 is wound around the outer peripheral surface of the cable core 1 (longitudinal attachment), a water-resistant medium-density polyethylene layer (for example, Ube Maruzen Polyethylene Co., Ltd., product Name: UBE polyethylene UBEC600V6) is extruded, and furthermore, a flame-retardant low-density polyethylene (for example, Nippon Polyethylene Co., Ltd., trade name) obtained by adding a metal hydroxide to the outer peripheral surface of the water-resistant medium density polyethylene layer (inner layer) 2b : by extruding REXPEARL EEA CA1155B) 2a, inner and outer two layers 2a, 2b of the sheath 2 is provided, and water resistant flame retardant non-halogen sheath voltage cable P 1 according to the present invention.

その耐水性中密度ポリエチレン層2bと難燃低密度ポリエチレン層2aの押し出し成形は、両層2b、2aを同時押し出しとしたり、2段押し出しとしたりし得るが、同時押し出しは、耐水性中密度ポリエチレン層2bの層厚を薄くし得る利点がある。
その耐水性中密度ポリエチレン層2bの厚みtと難燃低密度ポリエチレン層2aの厚みTの割合は1/13〜1/9(1/13・T≦t≦1/9・T)とする(図1(b)参照)。金属水酸化物は従来から使用する水酸化マグネシウム、水酸化アルミニウム等を採用し得る。
The extrusion of the water-resistant medium-density polyethylene layer 2b and the flame-retardant low-density polyethylene layer 2a can be performed by extruding both layers 2b and 2a simultaneously or by two-step extrusion. There is an advantage that the layer thickness of the layer 2b can be reduced.
The ratio of the thickness t of the water-resistant medium-density polyethylene layer 2b to the thickness T of the flame-retardant low-density polyethylene layer 2a is 1/13 to 1/9 (1/13 · T ≦ t ≦ 1/9 · T) ( FIG. 1 (b)). As the metal hydroxide, conventionally used magnesium hydroxide, aluminum hydroxide, or the like can be employed.

この高圧ケーブルPは、金属水酸化物によって難燃性が担保され、万が一、長時間水没状態になっても、耐水性中密度ポリエチレン層2bによって水遮断されるため、水分がケーブルコア1(導体1a)に至ることはない。このため、ケーブルPに必要な特性であるシース抵抗が低下することはない。 The high-voltage cable P 1, the flame retardancy is secured by a metal hydroxide, any chance, even if the long submerged state, because it is water blocked by water-resistant medium density polyethylene layer 2b, moisture cable core 1 ( It does not reach conductor 1a). Therefore, the sheath resistance is a characteristic required for the cable P 1 is not lowered.

図2には、参考例及び他の実施形態を示し、上記ケーブルコア1の3本を介在4を介し撚り合わせて押さえテープ3で断面円形にした後、その外周面に上記耐水性中密度ポリエチレン層2bと上記難燃低密度ポリエチレン層2aの2層からなるシース2を設けた参考例であるケーブルP(図2(a))と、上記図1(b)の耐水性難燃ノンハロゲンシース高圧ケーブルPの3本を撚り合わせた他の実施形態のケーブルP(図2(b))を作成した。 FIG. 2 shows a reference example and other embodiments, in which three of the cable cores 1 are twisted via an interposition 4 to form a circular cross section with a holding tape 3, and the outer peripheral surface of the water-resistant medium-density polyethylene is formed. A cable P 2 (FIG. 2A) as a reference example provided with a sheath 2 composed of two layers of a layer 2b and the flame-retardant low-density polyethylene layer 2a, and the water-resistant flame-retardant non-halogen sheath of FIG. 1B. cable P 3 of other embodiments twisting three high-voltage cables P 1 was created (Figure 2 (b)).

そのケーブルPは、外径:37.7mm、ケーブルコア1の径:33.1mm、耐水性中密度ポリエチレン層2bの層厚t:0.3mm、難燃低密度ポリエチレン層2aの層厚T:2.1mmとした内外半導電層押出型3.3kV架橋ポリエチレン絶縁ノンハロゲン難燃ポリエチレンシースケーブル(3.3kVNH−CE−3c(E−E))であり、ケーブルPは、外径:57.3mm、押さえテープ厚:0.15mm、ケーブルコア1は前記と同一径又は層厚とした内外半導電層押出型3.3kV架橋ポリエチレン絶縁ノンハロゲン難燃ポリエチレンシースケーブル(3.3kVNH−CE−T(E−E))である。 That cable P 2 has an outer diameter: 37.7 mm, the cable core 1 diameter: 33.1 mm, thickness t of the water-resistant medium density polyethylene layer 2b: 0.3 mm, thickness T of the flame燃低density polyethylene layer 2a : a 2.1mm and the inner and outer semiconductive layer extruded 3.3kV XLPE insulated non-halogen flame retardant polyethylene sheathed cables (3.3kVNH-CE-3c (E -E)), the cable P 3 has an outer diameter: 57 3.3 mm, holding tape thickness: 0.15 mm, and cable core 1 having the same diameter or layer thickness as described above, a 3.3 kV cross-linked polyethylene insulated non-halogen flame-retardant polyethylene sheath cable (3.3 kV NH-CE-T). (EE)).

この両ケーブルP、Pをそれぞれ6m用意し、まず、その端末において、シース2(耐水性中密度ポリエチレン層2bと難燃低密度ポリエチレン層2a)等を剥ぎ取り、ケーブルPにあっては、各軟銅テープ1eを剥ぎ取って一括して纏め、ケーブルPにあっては、各軟銅テープ1eを剥ぎ取り、図3に示すように、各ケーブルP、Pをその端末が水没しない状態で75℃の温水槽Wに浸した。
つぎに、ケーブルPにあっては、一括して纏めた軟銅テープ1eと温水槽Wの間に、ケーブルPにあっては、各ケーブルPの各軟銅テープ1eのそれぞれと温水槽Wの間に3000Vの直流電圧をそれぞれ印加し、電流計Mに電流が流れた時、絶縁抵抗が“0”になったとした。
比較例として、図3(b)のケーブルPにおいて、シース2を2層とせず(耐水性中密度ポリエチレン層2bを設けず)、ノンハロゲン(難燃低密度ポリエチレン)層2aのみのシース2としたケーブルも同様の試験をおこなった。
Each of the cables P 2 and P 3 is prepared by 6 m, and the sheath 2 (the water-resistant medium-density polyethylene layer 2 b and the flame-retardant low-density polyethylene layer 2 a) and the like are first stripped off at the end of the cable P 2. is collectively referred to peeled each annealed copper tape 1e, in the cable P 3, stripped respective soft copper tape 1e, as shown in FIG. 3, each cable P 2, P 3 is the terminal submerged It was immersed in a hot water tank W at 75 ° C. without being used.
Next, in the cable P 2, during the soft copper tape 1e and warm water bath W which collectively referred to, in the cable P 3, respectively hot water bath W of each annealed copper tape 1e of each cable P 1 During this period, a DC voltage of 3000 V was applied, and when a current flowed through the ammeter M, the insulation resistance was assumed to have become "0".
As a comparative example, in the cable P 3 in FIG. 3 (b), without the sheath 2 has a two-layer (without providing a water-resistant medium density polyethylene layer 2b), non-halogen sheath 2 (flame燃低density polyethylene) layer 2a only The same test was carried out for the cable.

その測定(試験)によると、ケーブルP、P(P)は91日間において、シース2における絶縁抵抗の低下は認められなかったのに対し、比較例のケーブルは91日の経過前に同絶縁抵抗の低下が認められた。 According to the measurement (test), the cables P 2 and P 3 (P 1 ) did not show a decrease in the insulation resistance in the sheath 2 for 91 days, whereas the cable of the comparative example did not show the decrease before 91 days. A decrease in the insulation resistance was observed.

このケーブルP、P、P は、シース2を難燃低密度ポリエチレン層2aで大部分を構成している、例えば、P 、P にあっては、耐水性中密度ポリエチレン2bの層厚tと難燃低密度ポリエチレン2aの層厚Tの割合を、1/13〜1/9(1/13・T≦t≦1/9・T)としているため、柔軟性があって、施工性は低下しないものであった。
因みに、高圧ケーブルは、布設後の保守点検時、シース2の絶縁性能を計測するが、このケーブルP、P、Pは、布設後に水に浸ってもシース2の絶縁性能が低下しないため、その保守点検において、シース2の絶縁性能の低下によって不良ケーブルとなる可能性が低く、寿命の長いものとなる。
The cable P 1, P 2, P 3 is a sheet over scan 2 constitutes the most sparingly燃低density polyethylene layer 2a, for example, in the P 1, P 3, water resistance medium density polyethylene the proportion of the thickness t and the flame燃低density polyethylene 2a of thickness T of 2b, because you are 1 / 13~1 / 9 (1/13 · T ≦ t ≦ 1/9 · T), flexibility Thus, the workability did not decrease.
Incidentally, the insulation performance of the sheath 2 of the high-voltage cable is measured at the time of maintenance and inspection after the installation, but the insulation performance of the sheath 2 of the cables P 1 , P 2 , and P 3 does not decrease even when immersed in water after the installation. Therefore, in the maintenance and inspection, the possibility of a defective cable due to a decrease in the insulation performance of the sheath 2 is low, and the life is long.

、P、P 高圧ケーブル
1 ケーブルコア
1a 導体
1b 内部半導電層
1c 絶縁体
1d 外部半導電層
1e 軟銅テープ(遮蔽層)
2 シース
2a 金属水酸化物からなる難燃材を添加した難燃低密度ポリエチレン層
2b 耐水性中密度ポリエチレン層
3 押さえテープ
4 介在
P 1, P 2, P 3 high-voltage cable 1 cable core 1a conductor 1b inner semiconducting layer 1c insulator 1d outer semiconductive layer 1e soft copper tape (shielding layer)
2 Sheath 2a Flame-retardant low-density polyethylene layer 2b to which flame-retardant material made of metal hydroxide is added Water-resistant medium-density polyethylene layer 3 Holding tape 4 Intervening

Claims (2)

導体(1a)を絶縁体(1c)で被覆し、その外周に遮蔽層(1e)を形成したケーブルコア(1)の外表面にシース(2)を設けた高圧ケーブル(P)であって、
上記シース(2)を内外2層として、その外層(2a)がノンハロゲン難燃材を添加した難燃低密度ポリエチレンで形成されているとともに、内層(2b)が耐水性中密度ポリエチレンで形成されており、
上記耐水性中密度ポリエチレン(2b)の層厚(t)と上記難燃低密度ポリエチレン(2a)の層厚(T)の割合を、1/13〜1/9(1/13・T≦t≦1/9・T)としたことを特徴とする耐水性難燃ノンハロゲンシース高圧ケーブル。
A high-voltage cable (P 1 ) in which a conductor (1a) is covered with an insulator (1c) and a sheath (2) is provided on an outer surface of a cable core (1) having a shielding layer (1e) formed on the outer periphery thereof. ,
The sheath (2) has two layers, an inner layer and an outer layer. The outer layer (2a) is formed of flame-retardant low-density polyethylene to which a halogen-free flame retardant is added, and the inner layer (2b) is formed of water-resistant medium-density polyethylene. Yes,
The ratio of the layer thickness (t) of the water resistant medium density polyethylene (2b) to the layer thickness (T) of the flame retardant low density polyethylene (2a) is 1/13 to 1/9 (1/13 · T ≦ t). ≦ 1/9 · T), a water-resistant flame-retardant non-halogen sheath high-voltage cable.
請求項1記載の耐水性難燃ノンハロゲンシース高圧ケーブル(P)の複数本を撚り合わせたことを特徴とする耐水性難燃ノンハロゲンシース高圧ケーブル。 A water-resistant flame-retardant non-halogen sheath high-voltage cable, wherein a plurality of the water-resistant flame-retardant non-halogen sheath high-voltage cables (P 1 ) according to claim 1 are twisted.
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