JPH06187846A - Electromagnetically shielded cable - Google Patents
Electromagnetically shielded cableInfo
- Publication number
- JPH06187846A JPH06187846A JP33423492A JP33423492A JPH06187846A JP H06187846 A JPH06187846 A JP H06187846A JP 33423492 A JP33423492 A JP 33423492A JP 33423492 A JP33423492 A JP 33423492A JP H06187846 A JPH06187846 A JP H06187846A
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic
- shielding
- shielded cable
- layer
- cable
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電磁遮蔽ケーブルに関
する。FIELD OF THE INVENTION The present invention relates to an electromagnetically shielded cable.
【０００２】[0002]
【従来の技術】一般に、送電線等に近接して布設される
通信用のケーブルなどは、送電線からの電磁界の影響を
受けるのを防止する必要があるため、従来より電磁遮蔽
ケーブルが使用されている。2. Description of the Related Art Generally, an electromagnetic shield cable is used for a communication cable or the like laid near a power transmission line because it is necessary to prevent the influence of an electromagnetic field from the power transmission line. Has been done.
【０００３】従来の電磁遮蔽ケーブルは、ケーブル心線
の上に導電層と遮蔽層とが順次形成されて構成されてい
る。そして、導電層としては、低抵抗のＡlやＣuなどで
できたコルゲート管等が使用され、また、遮蔽層として
は、高透磁率材料である方向性ケイ素鋼からなるテー
プ、あるいは、電磁軟鉄のテープを単独に使用し、この
テープを導電層の上に巻き付けて構成されている。A conventional electromagnetic shielded cable is constructed by sequentially forming a conductive layer and a shield layer on a cable core wire. A corrugated tube made of Al or Cu having a low resistance is used as the conductive layer, and a tape made of grain-oriented silicon steel, which is a high magnetic permeability material, or a soft magnetic iron is used as the shielding layer. The tape is used alone, and the tape is wound around the conductive layer.
【０００４】[0004]
【発明が解決しようとする課題】ところで、近年の電力
需要の増大により、送電線の送電効率を高める必要か
ら、送電線に加える電圧を従来よりも昇圧する傾向があ
る。したがって、これに伴い、たとえば誘導縦電圧が３
００Ｖ／km以上の高誘導電圧域においても、高い電磁遮
蔽特性を有するケーブルが要求されている。By the way, due to the recent increase in demand for electric power, there is a tendency to increase the voltage applied to the transmission line more than in the past, because it is necessary to improve the transmission efficiency of the transmission line. Therefore, along with this, for example, the induced longitudinal voltage is 3
A cable having a high electromagnetic shielding property is required even in a high induction voltage range of 00 V / km or more.
【０００５】ここで、上記の遮蔽層として、方向性ケイ
素鋼からなるテープを単独で使用する場合、図２の破線
(図中の符号Ｂの曲線)で示すように、誘導縦電圧が３０
０Ｖ／km程度までの低、中の電圧域では比較的良好な遮
蔽係数λ(＝Ｖ0／Ｖ)[ここに、Ｖ0は電磁遮蔽ケーブル
のケーブル心線に誘導される電圧、Ｖは誘導縦電圧]を
示すが、誘導縦電圧が３００Ｖ／km以上の高電圧域で
は、遮蔽係数λが急激に増加し、電磁遮蔽特性が劣化す
る。Here, when a tape made of grain-oriented silicon steel is used alone as the shielding layer, the broken line in FIG.
As shown by (curve of reference B in the figure), the induced longitudinal voltage is 30
Shielding coefficient λ (= V 0 / V), which is relatively good in low and medium voltage ranges up to about 0 V / km [where V 0 is the voltage induced in the cable core of the electromagnetic shielding cable, and V is the induction [Longitudinal voltage], the shielding coefficient λ sharply increases in a high voltage range where the induced longitudinal voltage is 300 V / km or more, and electromagnetic shielding characteristics deteriorate.
【０００６】一方、上記の遮蔽層として、電磁軟鉄から
なるテープを単独で使用する場合、図２の一点鎖線(図
中の符号Ｃの曲線)で示すように、誘導縦電圧が１００
〜３００Ｖ／km程度の中電圧域では比較的良好な遮蔽係
数λを示すが、誘導縦電圧が１００Ｖ／km以下の低電圧
域および３００Ｖ／km以上の高電圧域では、遮蔽係数λ
が増加し、電磁遮蔽特性が劣化する。On the other hand, when a tape made of electromagnetic soft iron is used alone as the shielding layer, the induced longitudinal voltage is 100 as shown by the alternate long and short dash line in FIG. 2 (curve indicated by symbol C in the figure).
The shielding coefficient λ is relatively good in the medium voltage range of about 300 V / km, but the shielding coefficient λ is low in the low voltage range of 100 V / km or less and the high voltage range of 300 V / km or more.
And the electromagnetic shielding characteristics are deteriorated.
【０００７】つまり、遮蔽層として、従来のように、方
向性ケイ素鋼あるいは電磁軟鉄のテープを単独で使用す
る限り、誘導縦電圧が３００Ｖ／km以上の高電圧域で
は、遮蔽係数αが大きくなり、電磁遮蔽特性の要求を未
だ十分に満たすことができない。That is, as long as the conventional tape of directional silicon steel or electromagnetic soft iron is used alone as the shielding layer, the shielding coefficient α becomes large in the high voltage region where the induced longitudinal voltage is 300 V / km or more. However, the requirements for electromagnetic shielding characteristics cannot be sufficiently satisfied.
【０００８】このため、今までは、電磁遮蔽ケーブルの
電磁遮蔽特性を最大限に引き出すために、接地工事に多
大の費用をかけているのが現状である。Therefore, until now, in order to maximize the electromagnetic shielding characteristics of the electromagnetic shielding cable, it is the current situation that a great deal of cost is required for grounding work.
【０００９】本発明は、上記の問題点を解決するために
なされたもので、誘導縦電圧が低電圧域から３００Ｖ／
km以上の高電圧域まで、良好な電磁遮蔽特性が得られる
ようにして、接地工事にかける費用等も削減できるよう
にすることを課題とする。The present invention has been made to solve the above-mentioned problems, and the induced longitudinal voltage is 300 V / V from the low voltage range.
It is an object to obtain good electromagnetic shielding characteristics up to a high voltage range of more than km and to reduce the cost for grounding work.
【００１０】[0010]
【課題を解決するための手段】本発明は、上記の課題を
解決するため、ケーブル心線の上に、導電層と遮蔽層と
が順次形成されてなる電磁遮蔽ケーブルにおいて、次の
構成を採る。In order to solve the above-mentioned problems, the present invention adopts the following structure in an electromagnetic shield cable in which a conductive layer and a shield layer are sequentially formed on a cable core wire. .
【００１１】すなわち、本発明では、遮蔽層は、方向性
ケイ素鋼と電磁軟鉄の各テープを組み合わせて構成され
ていることを特徴とするものである。That is, the present invention is characterized in that the shielding layer is formed by combining the tapes of grain-oriented silicon steel and electromagnetic soft iron.
【００１２】[0012]
【作用】上記構成において、遮蔽層が方向性ケイ素鋼と
電磁軟鉄の各テープを組み合わせることで、各テープを
それぞれ単独で使用する場合に比較して、全誘導電圧域
で電磁遮蔽特性が大幅に改善される。これは、単に、両
者の加算的な効果ではなく、高透磁率を保ちつつ磁気飽
和も高い電磁領域で起こるという相乗効果が発揮される
ためである。In the above structure, by combining the tapes of the directional silicon steel and the electromagnetic soft iron as the shielding layer, the electromagnetic shielding characteristics are greatly improved in the entire induced voltage range as compared with the case where each tape is used alone. Be improved. This is because not only the additive effect of the two, but also the synergistic effect that the magnetic saturation occurs in the electromagnetic region where the magnetic permeability is high while maintaining the high magnetic permeability is exhibited.
【００１３】[0013]
【実施例】図１は、本発明の実施例に係る電磁遮蔽ケー
ブルの構成を示す側面図である。1 is a side view showing the structure of an electromagnetically shielded cable according to an embodiment of the present invention.
【００１４】同図において、１は電磁遮蔽ケーブルの全
体を示し、２はケーブル心線、４はＡlでできたコルゲ
ート管からなる導電層、６はポリエチレンテープででき
た押さえ巻き層、８は遮蔽層である。In the figure, 1 is the whole electromagnetic shielded cable, 2 is the cable core wire, 4 is a conductive layer made of a corrugated tube made of Al, 6 is a pressing winding layer made of polyethylene tape, and 8 is a shield. It is a layer.
【００１５】この遮蔽層８は、高透磁率材料である方向
性ケイ素鋼からなる２枚のテープ１０a，１０bと、電磁
軟鉄からなる２枚のテープ１２a，１２bとを組み合わて
構成されている。すなわち、本例では、厚さが０.３５m
m、幅が１８mmの方向性ケイ素鋼からなる２枚のテープ
１０a，１０bを押さえ巻き層６の上に最初にラップ巻き
し、その上にさらに、厚さが０.６mm、幅が１８mmの電
磁軟鉄からなる２枚のテープ１２a，１２bをラップ巻き
することで構成されている。The shield layer 8 is formed by combining two tapes 10a and 10b made of grain-oriented silicon steel, which is a high magnetic permeability material, and two tapes 12a, 12b made of electromagnetic soft iron. That is, in this example, the thickness is 0.35 m.
Two tapes 10a, 10b made of grain-oriented silicon steel having a width of m and a width of 18 mm are first wrapped and wrapped on the pressing winding layer 6, and an electromagnetic layer having a thickness of 0.6 mm and a width of 18 mm is further wound on the pressing winding layer 6. It is constructed by wrapping two tapes 12a, 12b made of soft iron.
【００１６】また、１４は不織布テープからなる押さえ
巻き層、１６はポリエチレンでできた防食層である。Further, 14 is a press-winding layer made of a non-woven fabric tape, and 16 is an anticorrosion layer made of polyethylene.
【００１７】上記構成の電磁遮蔽ケーブル１について、
誘導縦電圧Ｖ／kmと遮蔽係数αとの関係を調べた結果
を、図２の実線(図中の符号Ａの曲線)で示す。なお、こ
の場合の接地抵抗は４Ω／km、信号周波数は５０Ｈzで
ある。Regarding the electromagnetically shielded cable 1 having the above structure,
The result of examining the relationship between the induced longitudinal voltage V / km and the shielding coefficient α is shown by the solid line in FIG. 2 (curve indicated by reference symbol A in the figure). In this case, the ground resistance is 4 Ω / km and the signal frequency is 50 Hz.
【００１８】従来例のように、遮蔽層として高透磁率材
料である方向性ケイ素鋼からなるテープを単独に使用し
た場合(図中の符号Ｂの破線で示す曲線)、あるいは、電
磁軟鉄のテープを単独に使用した場合(図中の符号Ｃの
一点鎖線で示す曲線)のいずれの場合に比較しても、本
発明のものは、誘導縦電圧が低電圧域から高電圧域まで
の全領域にわたって、遮蔽係数αが低く抑えられてお
り、従来よりも電磁遮蔽特性が大幅に改善されることが
理解される。As in the conventional example, when a tape made of grain-oriented silicon steel, which is a high magnetic permeability material, is used alone as the shielding layer (curve indicated by broken line B in the figure), or a tape of electromagnetic soft iron. Compared to any of the cases of using (indicated by the dashed-dotted line C in the figure) alone, the present invention is characterized in that the induced longitudinal voltage is in the entire region from the low voltage region to the high voltage region. It is understood that the shielding coefficient α is suppressed to a low level and the electromagnetic shielding characteristics are significantly improved as compared with the conventional case.
【００１９】これは、単に、方向性ケイ素鋼と電磁軟鉄
との両者の特性の加算的な効果ではなく、両者の相乗効
果によって高透磁率を保ちつつ磁気飽和も高い電磁領域
で起こるためと考えられる。It is considered that this is not due to the additive effect of the characteristics of both the grain-oriented silicon steel and the electromagnetic soft iron, but due to the synergistic effect of the both, magnetic saturation occurs in the electromagnetic region while maintaining high magnetic permeability. To be
【００２０】[0020]
【発明の効果】本発明によれば、誘導縦電圧が低電圧域
から高電圧域までの全領域にわたって良好な電磁遮蔽特
性が得られる。したがって、同じ電磁遮蔽特性を得るた
めには、接地抵抗の値は比較的大きくても許容されるの
で、従来に比べて接地工事にかける費用を削減すること
ができる。According to the present invention, good electromagnetic shielding characteristics can be obtained over the entire range of the induced longitudinal voltage from the low voltage region to the high voltage region. Therefore, in order to obtain the same electromagnetic shielding characteristics, a relatively large value of the ground resistance is allowed, so that the cost for grounding work can be reduced as compared with the conventional case.
【図１】本発明の実施例に係る電磁遮蔽ケーブルの構造
を示す側面図である。FIG. 1 is a side view showing a structure of an electromagnetically shielded cable according to an embodiment of the present invention.
【図２】誘導縦電圧と遮蔽係数との関係を、本発明品と
従来品とを比較して示す特性図である。FIG. 2 is a characteristic diagram showing the relationship between the induced longitudinal voltage and the shielding coefficient, comparing the product of the present invention and the conventional product.
１…電磁遮蔽ケーブル、２…ケーブル心線、４…導電
層、８…遮蔽層、１０a，１０b…方向性ケイ素鋼からな
るテープ、１２a，１２b…電磁軟鉄からなるテープ。DESCRIPTION OF SYMBOLS 1 ... Electromagnetic shielding cable, 2 ... Cable core wire, 4 ... Conductive layer, 8 ... Shielding layer, 10a, 10b ... Tape made of directional silicon steel, 12a, 12b ... Tape made of electromagnetic soft iron.
Claims (1)
が順次形成されてなる電磁遮蔽ケーブルにおいて、 前記遮蔽層は、方向性ケイ素鋼と電磁軟鉄の各テープを
組み合わせて構成されていることを特徴とする電磁遮蔽
ケーブル。1. An electromagnetic shielded cable in which a conductive layer and a shield layer are sequentially formed on a cable core wire, wherein the shield layer is formed by combining tapes of directional silicon steel and electromagnetic soft iron. Electromagnetic shielded cable characterized by having.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33423492A JPH06187846A (en) | 1992-12-15 | 1992-12-15 | Electromagnetically shielded cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33423492A JPH06187846A (en) | 1992-12-15 | 1992-12-15 | Electromagnetically shielded cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06187846A true JPH06187846A (en) | 1994-07-08 |
Family
ID=18275048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33423492A Pending JPH06187846A (en) | 1992-12-15 | 1992-12-15 | Electromagnetically shielded cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06187846A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6592304B1 (en) * | 1999-05-28 | 2003-07-15 | Betek Bergbau-Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg | Method for tipping a cutter head of an end-milling cutter |
-
1992
- 1992-12-15 JP JP33423492A patent/JPH06187846A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6592304B1 (en) * | 1999-05-28 | 2003-07-15 | Betek Bergbau-Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg | Method for tipping a cutter head of an end-milling cutter |
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