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JP4253003B2 - Winding type optical fiber cable - Google Patents

Winding type optical fiber cable Download PDF

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JP4253003B2
JP4253003B2 JP2006055665A JP2006055665A JP4253003B2 JP 4253003 B2 JP4253003 B2 JP 4253003B2 JP 2006055665 A JP2006055665 A JP 2006055665A JP 2006055665 A JP2006055665 A JP 2006055665A JP 4253003 B2 JP4253003 B2 JP 4253003B2
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optical fiber
fiber cable
protective coating
coating
outermost layer
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嘉忠 大久保
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THE FURUKAW ELECTRIC CO., LTD.
Viscas Corp
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本発明は、架空送電線や架空地線などの架空線に巻き付けて使用される巻付け型光ファイバケーブルに関するものである。   The present invention relates to a wound optical fiber cable that is used by being wound around an overhead wire such as an overhead power transmission line or an overhead ground wire.

一般に巻付け型光ファイバケーブルは、1本以上の光ファイバ心線を含む光ファイバユニットに保護被覆を施した構成となっている(特許文献1の図11、図12参照)。   Generally, a wound optical fiber cable has a configuration in which a protective coating is applied to an optical fiber unit including one or more optical fiber core wires (see FIGS. 11 and 12 of Patent Document 1).

特開2000−207955号公報JP 2000-207955 A

光ファイバケーブルを架空線に巻き付けると、コロナ放電が発生しやすくなり、コロナ放電による騒音被害が問題となる。コロナ放電を抑制するためには、保護被覆を軟質の半導電性ゴムで構成し、光ファイバケーブルの保護被覆を架空線に密着させることが好ましい。しかし保護被覆が軟質の半導電性ゴムで構成された巻付け型光ファイバケーブルは、鳥(カラス等)の啄害を受けて保護被覆が損傷する可能性がある。   When an optical fiber cable is wound around an overhead wire, corona discharge is likely to occur, and noise damage due to corona discharge becomes a problem. In order to suppress the corona discharge, it is preferable that the protective coating is made of a soft semiconductive rubber and the protective coating of the optical fiber cable is adhered to the overhead wire. However, a wound optical fiber cable having a protective coating made of a soft semiconductive rubber may be damaged by birds (crows or the like).

本発明の目的は、鳥の啄害を受けても保護被覆が損傷し難い巻付け型光ファイバケーブルを提供することにある。   An object of the present invention is to provide a wound optical fiber cable in which a protective coating is hardly damaged even when a bird is damaged.

この目的を達成するため本発明は、光ファイバユニットに保護被覆を施してなる巻付け型光ファイバケーブルにおいて、前記保護被覆の最外層がデュロメータタイプAで測定した硬度(以下、デュロ硬度という)が65〜73で、体積固有抵抗が10 〜10 Ω・cmの材料で構成されていることを特徴とするものである。 In order to achieve this object, according to the present invention, in a wound optical fiber cable in which a protective coating is applied to an optical fiber unit, the outermost layer of the protective coating has a hardness measured by a durometer type A (hereinafter referred to as a durometer). 65 to 73, and a volume specific resistance is made of a material having a volume resistivity of 10 3 to 10 5 Ω · cm .

また本発明において、保護被覆の最外層は半導電性ゴムからなり、その内側の層が最高連続使用温度(JIS K 7226による)250℃以上の耐熱性樹脂からなることが好ましい。   In the present invention, the outermost layer of the protective coating is preferably made of a semiconductive rubber, and the inner layer is preferably made of a heat resistant resin having a maximum continuous use temperature (according to JIS K 7226) of 250 ° C. or higher.

さらに本発明において、保護被覆の最外層の厚さは1.5mm以上であることが好ましい。   Furthermore, in the present invention, the thickness of the outermost layer of the protective coating is preferably 1.5 mm or more.

保護被覆の最外層をデュロ硬度65〜3の材料で構成すると、コロナ放電が低減でき、かつ鳥の啄害を受けても保護被覆が損傷し難くなる。 When constituting the outermost layer of the protective coating material of durometer 6 for 5-7 3, it can be reduced corona discharge, and even protective coating undergoing啄害bird hardly damaged.

架空線に巻き付けられた光ファイバケーブルが何らかの原因で断線した場合、切れた光ファイバケーブルが垂れ下がり、その下の送電線に接触して、地絡又は相間短絡事故を起こすおそれがある。保護被覆の最外層を体積固有抵抗10Ω・cm以上の材料で構成しておけば、切れた光ファイバケーブルが垂れ下がって下の送電線に接触しても電流が流れにくいので、地絡又は相間短絡事故を防止することができる。また保護被覆の最外層の体積固有抵抗が大きすぎると、コロナ放電が発生しやすくなるので、コロナ放電による騒音抑制の観点からは、保護被覆の最外層の体積固有抵抗を10Ω・cm以下にすることが好ましい。保護被覆の最外層の最も望ましい体積固有抵抗は10Ω・cm程度であり、この程度が地絡又は相間短絡事故防止とコロナ騒音防止とのバランスが最もよい。 When an optical fiber cable wound around an overhead wire is disconnected for some reason, the cut optical fiber cable may hang down and come into contact with a power transmission line below it, causing a ground fault or an interphase short-circuit accident. If the outermost layer of the protective coating is made of a material with a volume resistivity of 10 3 Ω · cm or more, even if a cut optical fiber cable hangs down and contacts the lower transmission line, current does not flow easily. Interphase short-circuit accidents can be prevented. Further, if the volume resistivity of the outermost layer of the protective coating is too large, corona discharge is likely to occur. Therefore, from the viewpoint of noise suppression by corona discharge, the volume resistivity of the outermost layer of the protective coating is 10 5 Ω · cm or less. It is preferable to make it. The most desirable volume resistivity of the outermost layer of the protective coating is about 10 4 Ω · cm, and this level has the best balance between prevention of ground fault or interphase short circuit accident and prevention of corona noise.

デュロ硬度65〜3の半導電性ゴムを被覆する際には、高温(250℃程度)の熱が数十秒間加わる。最外層の内側に、最高連続使用温度250℃以上の耐熱性樹脂からなる層を設けておけば、最外層に半導電性ゴムを被覆する際に、光ファイバユニット特に光ファイバ心線の樹脂被覆が熱的損傷を受けるのを防止できる。 In coating the semi-conductive rubber of durometer 6 for 5-7 3, heat of the high temperature (about 250 ° C.) is added a few tens of seconds. If a layer made of a heat-resistant resin with a maximum continuous use temperature of 250 ° C or higher is provided inside the outermost layer, when coating the outermost layer with semiconductive rubber, the optical fiber unit, especially the optical fiber core resin coating Can be prevented from being thermally damaged.

鳥の啄害を観察すると、傷の深さは概ね1mm程度であるので、保護被覆の最外層の厚さは1.5mm以上あれば、鳥の啄害を防止できる。鳥の啄害防止のためには、最外層の厚さは厚い方が有利であるが、最外層を厚くすると、ケーブル外径が大きくなり、風圧荷重が増大するので、最外層の厚さはこの面から制約される。このため、最外層の厚さは4mm以下とすることが好ましい。   When observing bird damage, the depth of the wound is approximately 1 mm. Therefore, if the thickness of the outermost layer of the protective coating is 1.5 mm or more, bird damage can be prevented. The thickness of the outermost layer is advantageous to prevent bird damage, but increasing the outermost layer increases the cable outer diameter and increases the wind pressure load, so the outermost layer thickness is It is restricted from this aspect. For this reason, the thickness of the outermost layer is preferably 4 mm or less.

図1は本発明の一実施形態を示す。この巻付け型光ファイバケーブル1は、光ファイバユニット2に保護被覆3を施したものである。光ファイバユニット2は、複数本の光ファイバ心線4を抗張力線5と共に撚り合わせることにより構成されている。保護被覆3は、内層被覆6と外層被覆7の2層で構成されている。   FIG. 1 shows an embodiment of the present invention. The wound optical fiber cable 1 is obtained by applying a protective coating 3 to an optical fiber unit 2. The optical fiber unit 2 is configured by twisting a plurality of optical fiber core wires 4 together with tensile strength wires 5. The protective coating 3 is composed of two layers, an inner layer coating 6 and an outer layer coating 7.

外層被覆7は半導電性ゴムで構成される。半導電性ゴムのデュロ硬度(JIS K 6253による)は65〜3、体積固有抵抗(JIS K 7194「導電性プラスチックの4探針法による抵抗率試験方法」による)は10〜10Ω・cmである。外層被覆7の材質は、より具体的には、カーボンブラックを配合して半導電性を付与したシリコーンゴム又はエチレンプロピレンゴム(EPDM)などであり、その硬さは添加剤によって調整される。 The outer layer coating 7 is made of semiconductive rubber. Durometer of semiconductive rubber (according to JIS K 6253) 6 for 5-7 3, (according to JIS K 7194 "resistivity test method by a four probe method of conductive plastic") volume resistivity of 10 3 to 105 Ω · cm. More specifically, the material of the outer layer coating 7 is silicone rubber or ethylene propylene rubber (EPDM) or the like, which is semi-conducted by blending carbon black, and its hardness is adjusted by an additive.

内層被覆6は、外層被覆7を形成する際の熱から光ファイバユニット2を保護するため(特に光ファイバ心線4の被覆材料である紫外線硬化型樹脂が熱劣化して伝送損失増加が生じないようにするため)に設けられるもので、最高連続使用温度250℃以上の耐熱性樹脂で構成される。内層被覆7の材質は、より具体的には、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体(PFA)などである。   The inner layer coating 6 protects the optical fiber unit 2 from the heat generated when the outer layer coating 7 is formed (particularly, the ultraviolet curable resin that is the coating material of the optical fiber core 4 is thermally deteriorated so that transmission loss does not increase. And is made of a heat-resistant resin having a maximum continuous use temperature of 250 ° C. or higher. More specifically, the material of the inner layer coating 7 is tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA) or the like.

次に巻付け型光ファイバケーブルの試作試験についた説明する。   Next, a description will be given of a trial production test of a wound optical fiber cable.

〔鳥の啄害について〕図1のようなケーブル構成で、外層被覆7のデュロ硬度が異なる複数種類のサンプルを試作し(外層被覆7の厚さ1.5mm)、各々のサンプルを長さ1mの送電線に巻き付けたものを、鉄塔上の送電線の近くに設置し、1ヶ月後に回収して、鳥の啄害を調べた。その結果は表1のとおりであった。   [Regarding bird damage] A plurality of types of samples having different cable thicknesses as shown in Fig. 1 and having different durometers of the outer layer coating 7 (thickness of the outer layer coating 7 is 1.5 mm), each sample having a length of 1 m The thing wound around the power transmission line was installed near the power transmission line on the steel tower and collected one month later to examine bird damage. The results are shown in Table 1.

Figure 0004253003
Figure 0004253003

この結果によると、外層被覆7のデュロ硬度が65以上あれば、鳥の啄害を受けても外層被覆が破れることはないことが分かる。なお、デュロ硬度が73より高くなると、光ファイバケーブルを送電線に巻き付けたときに、送電線の素線と点接触するような状態になることからコロナ放電(騒音)が発生しやすくなる。 According to this result, if the outer layer sheath 7 Duro hardness 6 5 on more than a, it can be seen that the outer coating will not be broken even under啄害birds. Incidentally, when the durometer is high Ri 7 3 good, when winding the optical fiber cable in the transmission line, the corona discharge (noise) is likely to arise from a state such that contact wires and the point of the transmission line .

〔耐電圧特性について〕図1のようなケーブル構成で、外層被覆7の体積固有抵抗が異なる複数種類のサンプルを試作し(外層被覆7の厚さ1.5mm)、各々のサンプルについて、課電試験装置によりフラッシュオーバー電圧を求めた。その結果は表2のとおりであった。   [Withstand voltage characteristics] With the cable configuration shown in FIG. 1, a plurality of types of samples having different volume specific resistances of the outer coating 7 are manufactured (the thickness of the outer coating 7 is 1.5 mm). The flashover voltage was determined using a test apparatus. The results are shown in Table 2.

Figure 0004253003
Figure 0004253003

この結果によると、外層被覆7の体積固有抵抗が10Ω・cm以上あれば、56kV/mの電圧がかかってもフラッシュオーバーが発生しないことが分かる。これは、切れた光ファイバケーブルが垂れ下がって下の送電線に接触しても、地絡又は相間短絡事故が発生しないことを意味する。 According to this result, it can be seen that if the volume resistivity of the outer layer coating 7 is 10 3 Ω · cm or more, flashover does not occur even when a voltage of 56 kV / m is applied. This means that a ground fault or a short circuit between phases will not occur even if a cut optical fiber cable hangs down and contacts the lower transmission line.

〔コロナ特性について〕図1のようなケーブル構成で、外層被覆7の体積固有抵抗が異なる複数種類のサンプルを試作し(外層被覆7の厚さ1.5mm)、各々のサンプルを送電線に巻き付けて、電線表面最大電位傾度Gmax(kV/m)を変化させたときのコロナ騒音を測定した。なお、最外層を構成する樹脂のデュロ硬度は73であった。測定結果を図2に示す。この結果によると、外層被覆7の体積固有抵抗が10Ω・cm以下、好ましくは10Ω・cm以下であれば、Gmax=16.8kV/cmにおいてコロナ騒音を十分低く抑えられることが分かる。 [Corona characteristics] In the cable configuration as shown in Fig. 1, a plurality of types of samples having different volume specific resistances of the outer coating 7 are manufactured (the thickness of the outer coating 7 is 1.5 mm), and each sample is wound around a transmission line. Then, the corona noise when the electric wire surface maximum potential gradient Gmax (kV / m) was changed was measured. Incidentally, durometer of the resin constituting the outermost layer was 7 3. The measurement results are shown in FIG. According to this result, it can be seen that when the volume resistivity of the outer layer coating 7 is 10 5 Ω · cm or less, preferably 10 4 Ω · cm or less, the corona noise can be suppressed sufficiently low at Gmax = 16.8 kV / cm. .

本発明に係る巻付け型光ファイバケーブルの一実施形態を示す断面図。Sectional drawing which shows one Embodiment of the winding type | mold optical fiber cable which concerns on this invention. 保護被覆の最外層の体積固有抵抗が異なる光ファイバケーブルの、コロナ騒音の測定結果を示すグラフ。The graph which shows the measurement result of the corona noise of the optical fiber cable from which volume specific resistance of the outermost layer of protective coating differs.

符号の説明Explanation of symbols

1:巻付け型光ファイバケーブル
2:光ファイバユニット
3:保護被覆
4:光ファイバ心線
5:抗張力線
6:内層被覆
7:外層被覆
1: Wound-type optical fiber cable 2: Optical fiber unit 3: Protective coating 4: Optical fiber core wire 5: Tensile wire 6: Inner layer coating 7: Outer layer coating

Claims (3)

光ファイバユニットに保護被覆を施してなる巻付け型光ファイバケーブルにおいて、前記保護被覆の最外層がデュロメータタイプAで測定した硬度が65〜73で、体積固有抵抗が10 〜10 Ω・cmの材料で構成されていることを特徴とする巻付け型光ファイバケーブル。 In a wound optical fiber cable in which an optical fiber unit is provided with a protective coating, the outermost layer of the protective coating has a hardness measured with a durometer type A of 65 to 73, and a volume resistivity of 10 3 to 10 5 Ω · cm. A wrapping type optical fiber cable, characterized by comprising 保護被覆の最外層が半導電性ゴムからなり、その内側の層がJISK7226による最高連続使用温度250℃以上の耐熱性樹脂からなることを特徴とする請求項1記載の巻付け型光ファイバケーブル。 Becomes the outermost layer of the protective coating from the semi-conductive rubber, claim 1 Symbol placement of wound optical fiber cable layer of inside thereof, characterized in that it consists of maximum continuous use temperature 250 ° C. or more heat-resistant resin according to JISK7226 . 保護被覆の最外層の厚さが1.5mm以上であることを特徴とする請求項記載の巻付け型光ファイバケーブル。 The wound optical fiber cable according to claim 2 , wherein the thickness of the outermost layer of the protective coating is 1.5 mm or more.
JP2006055665A 2006-03-02 2006-03-02 Winding type optical fiber cable Expired - Fee Related JP4253003B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7656578B2 (en) 1997-03-21 2010-02-02 Imra America, Inc. Microchip-Yb fiber hybrid optical amplifier for micro-machining and marking
US8761211B2 (en) 1998-11-25 2014-06-24 Imra America, Inc. Multi-mode fiber amplifier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7656578B2 (en) 1997-03-21 2010-02-02 Imra America, Inc. Microchip-Yb fiber hybrid optical amplifier for micro-machining and marking
US8761211B2 (en) 1998-11-25 2014-06-24 Imra America, Inc. Multi-mode fiber amplifier
US9153929B2 (en) 1998-11-25 2015-10-06 Imra America, Inc. Mode-locked multi-mode fiber laser pulse source
US9570880B2 (en) 1998-11-25 2017-02-14 Imra America, Inc. Multi-mode fiber amplifier
US9595802B2 (en) 1998-11-25 2017-03-14 Imra America, Inc. Multi-mode fiber amplifier

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