JP4136101B2 - Grounding method for measurement of buried position of submarine cable - Google Patents
Grounding method for measurement of buried position of submarine cable Download PDFInfo
- Publication number
- JP4136101B2 JP4136101B2 JP23357698A JP23357698A JP4136101B2 JP 4136101 B2 JP4136101 B2 JP 4136101B2 JP 23357698 A JP23357698 A JP 23357698A JP 23357698 A JP23357698 A JP 23357698A JP 4136101 B2 JP4136101 B2 JP 4136101B2
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- JP
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- Prior art keywords
- cable
- grounding
- current
- detection
- conductor
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- 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.)
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Description
【0001】
【発明の属する技術分野】
本発明は、海底ケーブルの埋設位置を測定するために同ケーブルの両端部を接地する方法に関するものである。
【0002】
【従来の技術】
海底ケーブルの埋設位置を測定する方法として、ケーブルに交流検知電流を通電し、それに伴って発生する磁界を検知することが知られている。この検知電流には、ケーブル送電電流そのものを利用できる場合もあるが、直流ケーブルや磁界が打ち消される3芯一括ケーブルの場合、ケーブル外部に交流磁界を発生させることができない。そのため、ケーブル導体や埋設位置測定用にケーブルに設けた検知線の端部を接地し、大地(海水)を帰路とした経路に検知電流を通電することが行われている。
【0003】
ここで、検知線を設けた海底OFケーブルの一例を図2に示す。このケーブル20は中心から順に油通路1、導体2、絶縁紙に絶縁油を含浸した絶縁層3、鉛被4、検知線5および鎧装鉄線6を具えている。このようなケーブルの埋設位置を測定する場合、図3に示すように、ケーブル20の一端における検知線5に交流電源7を接続し、ケーブル20の両端部で検知線5、鉛被4および鎧装鉄線6を一括して接地している。
【0004】
【発明が解決しようとする課題】
しかし、上記の接地方法では、次のような問題があった。
ケーブル両端部における接地が検知線、鉛被および鎧装鉄線を一括して行われているため、帰路電流が鉛被および鎧装鉄線に直接分流する。その分流電流はケーブル内において検知線の電流と方向が逆向きであるため、検知線の電流による磁界が打ち消され、ケーブル埋設位置の検出感度が低減されるという問題があった。
【0005】
【課題を解決するための手段】
本発明接地方法は上記の課題を解消するもので、検知電流通電用導体とそれ以外の導電性ケーブル構成部材とを具える海底ケーブルの埋設位置を測定するために同ケーブルの両端部を接地する方法において、検知電流通電用導体の接地と導電性ケーブル構成部材の接地とを独立して行うことを特徴とする。
【0006】
ここで、検知電流通電用導体としては、海底ケーブルの導体自身や埋設位置測定用に設けた検知線が挙げられる。また、導電性ケーブル構成部材としては、鉛被や鎧装鉄線が挙げられる。例えば、検知線を具えるケーブルの場合、検知線の接地を単独で行い、これとは独立して鉛被および鎧装鉄線の接地を行う。その際、鉛被と鎧装鉄線の接地は、一括でも独立でも構わないが、独立して行う方が好ましい。
【0007】
検知電流通電用導体の接地と導電性ケーブル構成部材の接地とを独立して行うことで、導電性ケーブル構成部材への検知電流の分流は接地抵抗を介して行われる。そのため、一括接地の場合に比べて導電性ケーブル構成部材への分流電流が減少し、検知電流通電用導体の電流磁界の打ち消し効果が低減されて感度良く埋設位置の測定を行うことができる。
【0008】
【発明の実施の形態】
以下、本発明の実施の形態を説明する。図1は本発明接地方法の説明図である。ここでは、図2のケーブルと同じケーブル20の埋設位置を測定する場合を例として説明する。なお、図1において、図3と同一部分には同一符号を用いている
。
【0009】
ケーブル一端の検知線5に検知電流通電用の電源7を接続する。そして、ケーブル両端部において、検知線5、鉛被4および鎧装鉄線6の各々を独立して接地する。埋設位置を測定する際、電源7から交流検知電流を検知線5に通電し、大地8(海底)を帰路とする回路を形成する。
【0010】
検知線5を流れる電流は、検知線5の接地抵抗9を介して大地に流れ、そこから鉛被4および鎧装鉄線6へ分流することになる。その際、分流電流は鉛被4および鎧装鉄線6の各接地抵抗10,11を介して流れることにより、一括接地(図3)の場合に比べて減少される。従って、検知線電流に伴う磁界の打ち消し効果が抑制され、感度良く位置測定を行うことができる。
【0011】
【発明の効果】
以上説明したように、本発明接地方法によれば、検知電流通電用導体の接地とそれ以外の導電性ケーブル構成部材の接地とを独立して行うことで、一括接地の場合に比べて導電性ケーブル構成部材への分流電流を減少させ、検知電流通電用導体の電流磁界の打ち消し効果を低減して感度良く測定を行うことができる。発生磁界の打ち消し効果を低減できることにより、検知に必要な磁界を得るための検知電流を小さくできる。このことは通電装置の低電源容量化・小型化を意味し、特に大容量通電装置が必要となる長距離海底ケーブルへの適用の場合にメリットが大きい。
【図面の簡単な説明】
【図1】本発明接地方法の説明図である。
【図2】検知線を設けた海底OFケーブルの断面図である。
【図3】従来の接地方法の説明図である。
【符号の説明】
1油通路
2導体
3絶縁層
4鉛被
5検知線
6鎧装鉄線
7電源
8大地
9,10,11 接地抵抗
20 ケーブル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of grounding both ends of a submarine cable in order to measure a buried position of the submarine cable.
[0002]
[Prior art]
As a method for measuring the buried position of a submarine cable, it is known to apply an AC detection current to the cable and detect a magnetic field generated therewith. In some cases, the cable transmission current itself can be used as the detected current, but in the case of a DC cable or a three-core cable that cancels the magnetic field, an AC magnetic field cannot be generated outside the cable. Therefore, the end of the detection line provided in the cable for measuring the cable conductor and the buried position is grounded, and the detection current is supplied to the path that returns to the ground (seawater).
[0003]
Here, an example of a submarine OF cable provided with a detection line is shown in FIG. The
[0004]
[Problems to be solved by the invention]
However, the above grounding method has the following problems.
Since the grounding at both ends of the cable is performed collectively for the detection wire, the lead sheath, and the armored iron wire, the return current is shunted directly to the lead sheath and the armored iron wire. Since the shunt current is opposite in direction to the current of the detection line in the cable, there is a problem that the magnetic field due to the current of the detection line is canceled and the detection sensitivity of the cable embedment position is reduced.
[0005]
[Means for Solving the Problems]
The grounding method of the present invention solves the above-described problem, and grounds both ends of the cable in order to measure the buried position of the submarine cable including the conductor for detecting current conduction and the other conductive cable constituent members. The method is characterized in that the detection current conducting conductor is grounded independently of the conductive cable constituent member.
[0006]
Here, examples of the detection current conducting conductor include a conductor of the submarine cable itself and a detection line provided for measuring the buried position. In addition, examples of the conductive cable constituent member include a lead jacket and an armored iron wire. For example, in the case of a cable having a detection line, the detection line is grounded independently, and the lead coat and the armored iron wire are grounded independently. At this time, the grounding of the lead coat and the armored iron wire may be performed collectively or independently, but it is preferable to perform them independently.
[0007]
By independently grounding the sensing current conducting conductor and grounding the conductive cable constituent member, the detection current is diverted to the conductive cable constituent member via the grounding resistor. Therefore, the shunt current to the conductive cable constituent member is reduced as compared with the case of collective grounding, the current magnetic field canceling effect of the detection current conducting conductor is reduced, and the embedded position can be measured with high sensitivity.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram of the grounding method of the present invention. Here, a case where the embedded position of the
[0009]
A power source 7 for energizing the detection current is connected to the
[0010]
The current flowing through the
[0011]
【The invention's effect】
As described above, according to the grounding method of the present invention, by conducting the grounding of the sensing current conducting conductor and the grounding of the other conductive cable components independently, it is possible to conduct electricity compared to the case of collective grounding. Measurement can be performed with high sensitivity by reducing the shunt current to the cable constituent member and reducing the current magnetic field canceling effect of the sensing current conducting conductor. Since the effect of canceling the generated magnetic field can be reduced, the detection current for obtaining the magnetic field necessary for detection can be reduced. This means that the power supply device has a low power supply capacity and a small size, and is particularly advantageous when applied to a long-distance submarine cable that requires a large capacity power supply device.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a grounding method of the present invention.
FIG. 2 is a cross-sectional view of a submarine OF cable provided with detection lines.
FIG. 3 is an explanatory diagram of a conventional grounding method.
[Explanation of symbols]
1 oil passage
2 conductors
3 Insulation layer
4 Lead coating
5 detection lines
6 armored iron wire
7 power supply
8 earth
9, 10, 11 Ground resistance
20 cable
Claims (1)
検知電流通電用導体が、ケーブル導体自身又は埋設位置測定用にケーブルに設けた検知線であり、
検知電流通電用導体の接地とそれ以外の導電性ケーブル構成部材の接地とを独立して行うことを特徴とする海底ケーブルの埋設位置測定のための接地方法。In the method of grounding both ends of the submarine cable to measure the buried position of the submarine cable comprising the conductor for detecting current conduction and the other conductive cable constituent member,
The sensing current conducting conductor is a sensing wire provided on the cable conductor or the cable for burying position measurement,
A grounding method for measuring a buried position of a submarine cable, characterized in that grounding of a conductor for detecting current conduction and grounding of other conductive cable constituent members are performed independently.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23357698A JP4136101B2 (en) | 1998-08-04 | 1998-08-04 | Grounding method for measurement of buried position of submarine cable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23357698A JP4136101B2 (en) | 1998-08-04 | 1998-08-04 | Grounding method for measurement of buried position of submarine cable |
Publications (2)
Publication Number | Publication Date |
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JP2000059944A JP2000059944A (en) | 2000-02-25 |
JP4136101B2 true JP4136101B2 (en) | 2008-08-20 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP23357698A Expired - Fee Related JP4136101B2 (en) | 1998-08-04 | 1998-08-04 | Grounding method for measurement of buried position of submarine cable |
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JP (1) | JP4136101B2 (en) |
Families Citing this family (1)
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JP6389450B2 (en) * | 2015-08-25 | 2018-09-12 | 株式会社関海事工業所 | Submarine cable position search method and submarine pipe position search method |
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1998
- 1998-08-04 JP JP23357698A patent/JP4136101B2/en not_active Expired - Fee Related
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