JPH04118522U - Optical fiber composite power submarine cable - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an optical fiber composite power submarine cable equipped with a suspended anchor sensing function. [Structure] An optical fiber composite power submarine cable assembled with an optical fiber unit in which an optical fiber is housed in the groove of a spacer having a plurality of spiral grooves on the outer circumferential surface and a metal layer is provided on the outside, and multiple power cables. In the optical fiber composite power submarine cable, a metal wire is housed in at least one of the spiral grooves of the optical fiber unit.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention has a suspended anchor detection function to prevent accidents such as suspended anchors on submarine cables. The present invention relates to an optical fiber composite power submarine cable equipped with an optical fiber composite power submarine cable.

0002

[Conventional technology]

Normally, if a power submarine cable is damaged by an anchor or fishing gear, the cable will be destroyed. Because it takes a considerable number of days for the damage to occur, it is important to identify the vessel, etc. that caused the damage at the time of destruction. Although it is not possible to detect a failure, if it can be detected when a failure occurs, it may lead to damage to the submarine cable. Not only can accidents be prevented from occurring, but it is also easy to monitor ships that have caused problems. Become. From this perspective, there is a sense of anchorage as shown in Japanese Patent Publication No. 1-31243. A submarine cable with wires has been proposed.

0003 On the other hand, the need to combine optical fiber cables with power lines has increased in recent years. FIG. 1 is a cross-sectional view of an example of an optical fiber composite power submarine cable. shown in the drawing An optical fiber unit containing multiple power cables 1 and optical fiber cores, etc. Twist the multiple strips of strands 2 together in a circle together with an inclusion such as a plastic string, and press the strips to the outside. A winding layer 4 of the seat floor plastic string is provided through the winding tape, and many strings are placed on the outer periphery of the winding layer 4. A steel wire sheath 5 made of twisted galvanized iron wire is installed, and an exterior plus is added on the outside. It is constructed by providing a wound layer 6 of a tick string. The optical fiber unit 2 has a spacer having a plurality of spiral grooves on its outer peripheral surface. The optical fiber is housed in the groove of the sensor, and a metal layer is provided on the outside of the optical fiber. There is.

0004

[Problem that the idea aims to solve]

Based on conventional technology, we have developed an optical fiber composite power submarine cable with suspended anchor sensing function. When configuring a 3-stripes are often combined, as unique sensing properties are required), and one or multiple strips. It is necessary to combine multiple optical fiber units. In this case, the sensing line has the sensing ability In order to ensure that the power cables are When optical fiber units are combined in the state of This will cause a large amount to protrude outward from the cable, and the After installation, there is a high possibility that damage or excessive lateral pressure will be applied to the optical fiber, which is undesirable. stomach.

[0005] In addition, to avoid the problems mentioned above, the outer diameter of the optical fiber unit should be connected to the power cable. If it is made small to fit within the circumscribed circle of , it can be stored in a single optical fiber unit. The number of optical fibers that can be used is limited to 2 to 4 fibers, and it is a major problem in increasing the number of optical fibers. It will be a big hindrance.

[0006]

[Means to solve the problem]

This invention solves the above-mentioned problems by using an optical fiber composite power cable with a suspended anchor sensing function. It provides a bottom cable, and its feature is a strip with multiple spiral grooves on the outer circumferential surface. An optical fiber in which the optical fiber is housed in the above-mentioned groove of the pacer and a metal layer is provided on the outside. Optical fiber composite power submarine cable where units are assembled together with multiple power cables In the optical fiber unit, a metal wire is housed in at least one of the spiral grooves of the optical fiber unit. It's what I did.

[0007]

【Example】

Figure 2 shows the optical fiber unit in the optical fiber composite power submarine cable of the present invention. FIG. 3 is a cross-sectional view of a specific example. As shown in the drawing, the outer peripheral surface of the spacer 22 made of plastic such as polyethylene A plurality of spiral grooves 23 are formed in at least one of the spiral grooves 23. A metal wire 25 is housed in the groove, and an optical fiber core 24 is housed in the other spiral groove 23. It has been paid. A plastic layer 27 is provided on the outer periphery of the spacer 22, Furthermore, a metal layer 28 such as a lead coating is provided thereon. In addition, 21 in the drawing is a reinforcing core provided at the center of the spacer 22. Such an optical fiber unit 2 is connected to a plurality of power cables 1 as shown in FIG. Together with the strips, they are assembled into a circular shape via an inclusion 3, and a winding of the seat plastic string is placed on top of it. By applying a winding layer 4, a steel wire sheathing 5, a winding layer 6 of exterior plastic string, etc., it becomes as shown in Figure 1. A fiber optic composite power submarine cable is constructed.

[0008] In the optical fiber unit 2 as shown in FIG. As the wire 25, a copper wire with a diameter of about 1.5 mm is normally used. If the copper wire is too thick Since the rigidity increases, it is easier to come out of the spiral groove 23, and if it is too thin, it is difficult to come out of the spiral groove 23. Therefore, a diameter of about 1 to 2 mmφ is appropriate. Also, if you store steel wire instead of copper wire, good. Furthermore, the sensing ability improves as the number of copper wires increases, so the optical fiber core 24 At the same time, one wire may be stored in each spiral groove 23.

[0009] The copper wire 25 is inserted into the helical groove 23 together with an insulating compound 26 such as plastic or rubber. If it is stored in a do. Also, the metal layer 28 may be provided directly on the outer periphery of the spacer 22, but To improve insulation, use an insulating layer 27 of rubber, polyvinyl chloride, polyethylene, etc. may be provided between the spacer 22 and the metal layer 28. This insulating layer 27 is too thick. In this case, it becomes difficult for the metal wire 25 and the metal layer 28 to come into contact with each other, so the thickness is approximately 1 to 2 mm. It is desirable to do so. In addition, the metal layer 28 is made of lead, which is conventionally often used in optical fiber units. A semi-conductive tape may be applied as a floor layer under this metal layer 28. good. Although Fig. 2 shows a 6-groove spacer, there are other types such as 8-groove, 12-groove, 14-groove, etc. Needless to say, it can be used as needed.

0010

[Effect]

If an anchor gets caught on a power submarine cable or receives a direct hit from an anchor, the cable may excessive lateral pressure is applied. In the optical fiber composite power submarine cable of this invention, During normal operation, the metal wire stored in the spiral groove of the optical fiber unit mentioned above, There is no electrical conduction between the outer metal layers, and insulation is maintained. however When excessive lateral pressure is applied, submarine cables deform, and optical fiber units also deform. It deforms due to the pressure it receives from the iron wire armor. When the optical fiber unit undergoes deformation, The metal wire stored in the spiral groove jumps out of the groove and comes into contact with the metal layer, causing both The insulation between them is lost. Therefore, at the end, there is no disconnection between the metal wire and the outer metal layer. If the edge resistance is measured, it is possible to detect a suspended anchor.

[0011]

[Effect of the idea]

As explained above, according to the optical fiber composite power submarine cable of the present invention, By configuring anchor sensing function and optical fiber function in one optical fiber unit. As a result, it was possible to realize an optical fiber composite power submarine cable with a suspended anchor sensing function. come. Especially in power submarine cables that require multi-core composite optical fibers. effective.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an example of a fiber optic composite power submarine cable.

FIG. 2 is a cross-sectional view of a specific example of an optical fiber unit in the optical fiber composite power submarine cable of the present invention.

[Explanation of symbols]

2 Optical fiber unit 21 Reinforcement core 22 Spacer 23 Spiral groove 24 Optical fiber core
25 Metal wire 26 Insulator 27 Insulating layer 28
metal layer

Claims (1)

[Scope of utility model registration request] 1. An optical fiber composite power unit assembled with an optical fiber unit in which an optical fiber is housed in the groove of a spacer having a plurality of spiral grooves on the outer peripheral surface and a metal layer is provided on the outside thereof, and a plurality of power cables. An optical fiber composite power submarine cable, characterized in that a metal wire is housed in at least one of the spiral grooves of the optical fiber unit.