JP2008021483A - Snow dropping damage prevention overhead power line, and snow melting ring used for it - Google Patents

Snow dropping damage prevention overhead power line, and snow melting ring used for it Download PDF

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JP2008021483A
JP2008021483A JP2006191180A JP2006191180A JP2008021483A JP 2008021483 A JP2008021483 A JP 2008021483A JP 2006191180 A JP2006191180 A JP 2006191180A JP 2006191180 A JP2006191180 A JP 2006191180A JP 2008021483 A JP2008021483 A JP 2008021483A
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snow
overhead power
power line
ring
power transmission
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Yuji Asano
祐二 浅野
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Viscas Corp
Tokyo Electric Power Company Holdings Inc
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Tokyo Electric Power Co Inc
Viscas Corp
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<P>PROBLEM TO BE SOLVED: To provide a snow dropping damage prevention overhead power line capable of preventing snow dropping damage by splitting snow adhering to the overhead power line to break and reduce the size of dropping snow instead of melting the snow adhering to the overhead power line as a whole. <P>SOLUTION: Snow melting rings 1 are attached to the overhead power line 5 at intervals in its longitudinal direction. The snow melting ring 1 is composed by forming a heat insulating layer on the inside surface of a ferromagnetic ring 2. Since the heat insulating layer is interposed between the ferromagnetic ring 2 and the overhead power line 5, heat generated in the ferromagnetic ring is hardly absorbed to the overhead power line. The temperature of each ferromagnetic ring efficiently rises, snow only on parts with the rings attached thereto is surely melted in snowfall, and the snow adhering to the overhead power line is split in the longitudinal direction. By reducing the snow melting ring attachment interval D to a level (for instance, 50 cm) without damaging a structure below the line even if snow drops, damage due to dropping snow can be prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、架空送電線に付着した雪による落雪被害を防止する架空送電線と、それに用いる融雪リングに関するものである。   The present invention relates to an overhead power transmission line for preventing snowfall damage caused by snow attached to the overhead power transmission line, and a snow melting ring used therefor.

架空送電線に着雪が発生すると、それが落下したときに、線下の瓦屋根やビニールハウス、温室などに被害を及ぼすことがあり、その対策が求められている。   When snowfall occurs on an overhead power transmission line, it may cause damage to the tiled roof, plastic house, greenhouse, etc. under the line, and countermeasures are required.

落雪被害防止対策としては従来から、架空送電線に融雪スパイラルロッドを巻き付けることが行われていた。融雪スパイラルロッドは、低キュリー点の磁性線材にアルミめっきやアルミ被覆を施したもので、これを架空送電線に巻き付けておくと、電線に流れる電流により発生する交番磁界で磁性線材が発熱し、着雪を融かす、というものである（特許文献１参照）。   Conventionally, snow melting damage prevention measures have been to wind a snow melting spiral rod around an overhead power transmission line. A snow melting spiral rod is a low Curie point magnetic wire with aluminum plating or aluminum coating.When this is wound around an overhead power transmission line, the magnetic wire generates heat with an alternating magnetic field generated by the current flowing in the wire, It melts snowfall (see Patent Document 1).

また、架空送電線に強磁性体からなるリングを取り付け、融雪スパイラルロッドと同様の原理でリングを発熱させて、着雪を融かす、というアイデアも提案されている（特許文献２参照）   Further, an idea has been proposed in which a ring made of a ferromagnetic material is attached to an overhead power transmission line, and the ring is heated by the same principle as a snow melting spiral rod to melt snow (see Patent Document 2).

特開２０００−１８４５６７号公報JP 2000-184567 A 特開平５−２９２６３９号公報Japanese Patent Laid-Open No. 5-292539

前記融雪スパイラルロッドは、電線に十分に電流が流れている場合は、発熱量が大きく、電線の温度を十分上昇させて、効果的に融雪することが可能である。しかし、冬季は潮流が小さい送電線が多く、融雪スパイラルロッドを巻き付けても電流不足で十分に発熱せず、融雪できない場合があった。   The snow melting spiral rod generates a large amount of heat when a sufficient amount of current is flowing through the electric wire, and can sufficiently melt the snow by effectively raising the temperature of the electric wire. In winter, however, there are many power lines with low tidal currents, and even if a snow melting spiral rod is wound around, there is a case where the current is insufficient and heat is not sufficiently generated, and snow melting may not be possible.

また、前記強磁性体リングを取り付けて、電線に付着した雪を全て融かすためには、強磁性体リングを隙間なく取り付ける必要があり、そうすると、電線の重量が非常に大きなものとなり、鉄塔の強度不足が問題となるため、現実的ではない。   Moreover, in order to melt all the snow adhering to the electric wires by attaching the ferromagnetic rings, it is necessary to attach the ferromagnetic rings without any gaps, and as a result, the weight of the electric wires becomes very large, Insufficient strength becomes a problem and is not realistic.

本発明の目的は、架空送電線に付着した雪を全体的に融かすのではなく、架空送電線に付着した雪を分断して、落雪の大きさを小さくすることで、落雪被害を防止する落雪被害防止架空送電線と、それに用いる融雪リングを提供することにある。   The object of the present invention is to prevent snow fall damage by dividing snow falling on the overhead power transmission line and reducing the size of the snow fall instead of melting the snow attached to the overhead power transmission line as a whole. The purpose is to provide an overhead power transmission line to prevent damage from falling snow and a snow melting ring to be used therefor.

本発明に係る落雪被害防止架空送電線は、架空送電線に、その長手方向に間隔をあけて、断熱層を介して強磁性体リングを取り付けたことを特徴とするものである。   The snowfall damage-preventing overhead power transmission line according to the present invention is characterized in that a ferromagnetic ring is attached to the overhead power transmission line via a heat insulating layer at intervals in the longitudinal direction.

また、本発明に係る融雪リングは、架空送電線に取り付けられる強磁性体リングの内周面に断熱層を設けたことを特徴とするものである。   Further, the snow melting ring according to the present invention is characterized in that a heat insulating layer is provided on the inner peripheral surface of the ferromagnetic ring attached to the overhead power transmission line.

架空送電線に断熱層を介して強磁性体リングを取り付けると、強磁性体リングと架空送電線の間に断熱層が介在するため、強磁性体リングで発生した熱が架空送電線に吸収され難くなる。その結果、強磁性体リングの温度が効率よく上昇し、潮流が小さいときでも、降雪時に、強磁性体リングを取り付けた部分だけは確実に雪が融け、架空送電線の着雪は長手方向に分断される。降雪が止み、気温の上昇と共に電線に付着した雪は落下するが、融雪リング取付け部分には着雪がないため、落雪の大きさは最大でも融雪リング取付け間隔以下になる。したがって、融雪リング取付け間隔を、落雪があっても線下の構造物に被害を及ぼさない程度に小さくしておくことにより、落雪による被害を防止できる。   When a ferromagnetic ring is attached to an overhead power transmission line via a heat insulation layer, the heat generated in the ferromagnetic ring is absorbed by the overhead power transmission line because the heat insulation layer is interposed between the ferromagnetic ring and the overhead power transmission line. It becomes difficult. As a result, even when the temperature of the ferromagnetic ring rises efficiently and the tidal current is small, the snow is surely melted only at the part where the ferromagnetic ring is attached during snowfall. Is done. Snow stops and the snow attached to the wires falls as the temperature rises. However, since there is no snow at the snow-melting ring mounting portion, the size of snowfall is at most the snow-melting ring mounting interval. Therefore, the damage due to snowfall can be prevented by setting the snow-melting ring mounting interval so small that it does not damage the structures under the line even if snow falls.

また、本発明に係る融雪リングは、強磁性体リングと断熱層が一体化されているため、これを架空送電線に所要の間隔で取り付けるだけで、簡単に落雪被害防止架空送電線を構成できる。   In addition, since the snow melting ring according to the present invention has the ferromagnetic ring and the heat insulating layer integrated, it is possible to easily construct a snowfall damage-preventing overhead power transmission line by simply attaching the ring to the power transmission line at a required interval. .

図１は本発明の落雪被害防止架空送電線に用いる融雪リングの一実施形態を示す。この融雪リング１は、架空送電線の外周に取り付けられる強磁性体リング２の内周面に断熱層３を一体に設けたものである。強磁性体リング２は、強磁性体であればどのような材料で形成してもよいが、キュリー点の低いＦｅ−Ｎｉ合金で形成することが好ましい。断熱層３は、発泡スチロールやコルク、紙など、強磁性体より熱伝導率の低い材質で形成された層である。断熱層３は非金属材料で形成されることが望ましく、耐久性やコストの面からプラスチック又はゴムで形成することがより好ましく、特にポリカーボネート等が好適である。断熱層３の好ましい厚さは、１〜２mm程度である。   FIG. 1 shows an embodiment of a snow melting ring used for an overhead power transmission line for preventing snow fall damage according to the present invention. In this snow melting ring 1, a heat insulating layer 3 is integrally provided on the inner peripheral surface of a ferromagnetic ring 2 attached to the outer periphery of an overhead power transmission line. The ferromagnetic ring 2 may be formed of any material as long as it is a ferromagnetic body, but is preferably formed of an Fe—Ni alloy having a low Curie point. The heat insulating layer 3 is a layer formed of a material having a lower thermal conductivity than that of a ferromagnetic material, such as expanded polystyrene, cork, or paper. The heat insulating layer 3 is desirably formed of a non-metallic material, more preferably formed of plastic or rubber from the viewpoint of durability and cost, and polycarbonate is particularly preferable. The preferable thickness of the heat insulation layer 3 is about 1-2 mm.

融雪リング１は、架空送電線に取り付けられるようにするため、二つ割りにして、周方向の両端部を互いに連結できるようにするか、外周をバンドで締め付けるようにすることが好ましい。   In order to attach the snow melting ring 1 to the overhead power transmission line, it is preferable that the snow melting ring 1 is divided in two so that both ends in the circumferential direction can be connected to each other, or the outer periphery is fastened with a band.

図２は本発明に係る落雪被害防止架空送電線の一実施形態を示す。この落雪被害防止架空送電線４は、架空送電線５に、その長手方向に所要の間隔Ｄをあけて、図１に示した融雪リング１を取り付けたものである。   FIG. 2 shows an embodiment of the snowfall damage prevention overhead power transmission line according to the present invention. This snowfall damage prevention overhead power transmission line 4 is obtained by attaching the snow melting ring 1 shown in FIG. 1 to the overhead power transmission line 5 with a required distance D in the longitudinal direction.

融雪リング１の強磁性体リング２は、架空送電線５を流れる電流による交番磁界で発熱するが、強磁性体リング２の内周面には断熱層３が設けられているため、強磁性体リング２で発生した熱は架空送電線５に伝わり難くなっている。このため、強磁性体リング２で発生した熱は強磁性体リング２自体の温度を上昇させ、降雪時に強磁性体リング２に付着する雪を効率よく融かす。一方、架空送電線５には断熱層３の存在によりほとんど熱が伝わらないため、架空送電線５の温度は上昇しない。このため架空送電線５には雪が付着する。つまり、降雪時には、架空送電線５には雪が付着するが、融雪リング１を取り付けた部分は融雪されて雪が付着しないため、架空送電線５に付着する雪は長手方向に分断されたものとなる。   The ferromagnetic ring 2 of the snow melting ring 1 generates heat due to an alternating magnetic field generated by the current flowing through the overhead power transmission line 5, but since the heat insulating layer 3 is provided on the inner peripheral surface of the ferromagnetic ring 2, the ferromagnetic ring 2 The heat generated in the ring 2 is difficult to be transmitted to the overhead power transmission line 5. For this reason, the heat generated in the ferromagnetic ring 2 raises the temperature of the ferromagnetic ring 2 itself and efficiently melts the snow adhering to the ferromagnetic ring 2 during snowfall. On the other hand, since the heat is hardly transmitted to the overhead power transmission line 5 due to the presence of the heat insulating layer 3, the temperature of the overhead power transmission line 5 does not rise. For this reason, snow adheres to the overhead power transmission line 5. That is, during snowfall, snow is attached to the overhead power transmission line 5, but the snow attached to the overhead power transmission line 5 is divided in the longitudinal direction because the snow melting ring 1 is melted and snow is not attached. .

降雪が止み、気温の上昇によって架空送電線に付着した雪は落下するが、融雪リング取付け部分には雪が付着していないため、落雪の大きさは最大でも融雪リング１の取付け間隔Ｄ以下にすることができる。したがって融雪リングの取付け間隔Ｄを、落雪があっても線下の構造物に被害を及ぼさない程度に小さくしておくことにより、落雪による被害を防止できる。融雪リングの取付け間隔Ｄは、その地方に降る雪の比重等を勘案して設定されるが、小さいほど落雪を細分化できることから、５０cm以下にすることが好ましく、１０cm以下にすることがさらに好ましい。   Snow stops and snow attached to the overhead power transmission line falls due to a rise in temperature. However, since snow does not adhere to the snow-melting ring mounting part, the size of snowfall is at most the mounting interval D of the snow-melting ring 1 or less. be able to. Therefore, by reducing the attachment interval D of the snow melting ring to such an extent that it does not damage the structures under the line even if there is snowfall, damage due to snowfall can be prevented. The snow-melting ring mounting interval D is set in consideration of the specific gravity of snow falling in the region. However, the smaller the snow fall, the more preferably it is 50 cm or less, and more preferably 10 cm or less. .

強磁性体リングの内周面に、断熱層を設けない場合と設けた場合で、強磁性体リングの温度上昇にどの位の差があるかを調べるため、次のような実験を行った。ＡＣＳＲ８１０mm２の電線（外径３８．４mm）に、厚さ５mm、幅１０mmの強磁性体リング（Ｆｅ−Ｎｉ合金製）を、直接取り付けた場合（強磁性体リングの内面が電線表面に密接）と、厚さ１mmの断熱層（ポリカーボネート）を介して取り付けた場合（断熱層の内面が電線表面に密接）について、電線に流れる電流を変化させて、強磁性体リングの温度上昇を測定した。その結果を図３に示す。この結果から明らかなように、断熱層なしの場合は、熱が電線に吸収されてしまい、強磁性体リングの温度がほとんど上昇しないが、断熱層ありの場合は、強磁性体リングの大きな温度上昇が認められた。したがって、断熱層を設けることにより、リング取付け部分の融雪効果が格段に向上するので、架空送電線の着雪を長手方向に分断して、落雪による被害を防止することができる。 In order to investigate how much the temperature rise of the ferromagnetic ring differs depending on whether or not the heat insulating layer is provided on the inner peripheral surface of the ferromagnetic ring, the following experiment was conducted. When a ferromagnetic ring (made of Fe-Ni alloy) with a thickness of 5 mm and a width of 10 mm is directly attached to an ACSR 810 mm 2 electric wire (outer diameter 38.4 mm) (the inner surface of the ferromagnetic ring is in close contact with the electric wire surface) And when it attached through the heat insulation layer (polycarbonate) of thickness 1mm (the inner surface of a heat insulation layer is closely in contact with the electric wire surface), the electric current which flows into an electric wire was changed and the temperature rise of a ferromagnetic ring was measured. The result is shown in FIG. As is clear from this result, in the case without the heat insulation layer, the heat is absorbed by the electric wire, and the temperature of the ferromagnetic ring hardly rises, but in the case with the heat insulation layer, the temperature of the ferromagnetic ring is large. An increase was observed. Therefore, by providing the heat insulating layer, the snow melting effect at the ring mounting portion is remarkably improved, so that the snowfall of the overhead power transmission line can be divided in the longitudinal direction to prevent damage due to snowfall.

本発明に係る落雪被害防止架空送電線に用いる融雪リングの一実施形態を示す、（Ａ）は正面図、（Ｂ）は一部切開側面図。BRIEF DESCRIPTION OF THE DRAWINGS One Embodiment of the snow melting ring used for the snowfall damage prevention overhead power transmission line which concerns on this invention is shown, (A) is a front view, (B) is a partially cutaway side view. 図１の融雪リングを用いた落雪被害防止架空送電線の一実施形態を示す側面図。The side view which shows one Embodiment of the snowfall damage prevention overhead power transmission line using the snow-melting ring of FIG. 架空送電線に強磁性体リングを直接取り付けた場合と断熱層を介して取り付けた場合の、強磁性体リングの温度上昇の違いを示すグラフ。The graph which shows the difference in the temperature rise of a ferromagnetic ring when attaching a ferromagnetic ring to an overhead power transmission line directly, and attaching via a heat insulation layer.

符号の説明Explanation of symbols

１：融雪リング
２：強磁性体リング
３：断熱層
４：落雪被害防止架空送電線
５：架空送電線 1: Snow melting ring 2: Ferromagnetic ring 3: Thermal insulation layer 4: Snowfall damage prevention overhead power transmission line 5: Overhead power transmission line

Claims (2)

架空送電線に、その長手方向に間隔をあけて、断熱層を介して強磁性体リングを取り付けたことを特徴とする落雪被害防止架空送電線。   A snowfall-preventing overhead power transmission line, characterized in that a ferromagnetic ring is attached to the overhead power transmission line with a heat insulation layer at intervals in the longitudinal direction. 架空送電線に取り付けられる強磁性体リングの内周面に断熱層を設けたことを特徴とする融雪リング。   A snow melting ring characterized in that a heat insulating layer is provided on an inner peripheral surface of a ferromagnetic ring attached to an overhead power transmission line.
JP2006191180A 2006-07-12 2006-07-12 Snow dropping damage prevention overhead power line, and snow melting ring used for it Pending JP2008021483A (en)

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