JP2004274353A - Repeater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit a surge from advancing to a junction circuit by electrostatic induction and electromagnetic induction and from causing operation errors of a device when the surge advances into a feeder line when the repeater elements including the junction circuit is adjacent to the feeder line. <P>SOLUTION: A repeater 1 connected to a cable system is provided with a cylindrical pressure resistant housing 10 where an isolation cylinder 11 is arranged inside and a conductor cylinder 12 is arranged inside the isolation cylinder 11, a plurality of repeater elements 13 housed in the conductor cylinder 12 through an insulation, the feeding line 15 drawn from the outside of the pressure resistant housing 10 to feed power to the repeater elements 13, and a surge suppression conductor 19 made of conductive material that covers the circumference of the feeding line 15 in order to protect the repeater elements 13 from the surge advancing through the feeding line 15. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a repeater used for a submarine cable system, for example.
[0002]
[Prior art]
In a conventional submarine repeater, a plurality of repeater components including a repeater circuit are arranged inside an insulating cylinder arranged in a pressure-resistant housing. A surge protection circuit including an arrestor, a choke coil, and the like is also arranged inside the insulating cylinder, and the surge protection circuit prevents a surge from directly entering the repeater component (Patent Document 1).
[0003]
[Patent Document 1]
JP-A-7-336309
[Problems to be solved by the invention]
However, in practice, the relay component including the relay circuit and the power supply line are provided close to each other, so if a surge enters the power supply line, the surge enters the relay circuit by electrostatic induction or electromagnetic induction, and the equipment Could cause erroneous operation.
[0005]
In order to solve the above-mentioned surge problem, it is effective means to shield the power supply line electrostatically and electromagnetically in a conductor cylinder in the repeater. It is necessary to connect the shield on the ground side at the part with a different potential difference inside, and it is difficult to handle the shielded wire, it is difficult to shield the end face, and the thickness of the shield is required to completely shield the surge There were problems such as the need for a certain amount or more. The present invention has been made to solve the above problems.
[0006]
[Means for Solving the Problems]
The repeater according to the present invention has an insulating cylinder therein, a cylindrical pressure-resistant housing in which a conductor cylinder is further disposed, a plurality of repeater components contained in the conductor cylinder via an insulator, A power supply line that is drawn in from the outside of the pressure-resistant housing and supplies power to the repeater component, and a conductor that wraps around the power supply line to protect the repeater component from surge entering through the power supply line A surge suppression conductor.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
1A is a plan sectional view of a repeater according to Embodiment 1 of the present invention, and FIG. 1B is a sectional view showing an AA ′ section of FIG. 1A in an enlarged manner. In the drawing, a pressure-resistant housing 10 is a structure intended to withstand water pressure on the sea floor, has a cylindrical shape, and has an insulating cylinder 11 therein and a conductor cylinder 12 disposed concentrically therein, A plurality of (four in the figure, four relay components) repeater components 13 having a relay circuit for relaying a communication signal inside the conductor cylinder 12 are insulated from the conductor cylinder 12. Is contained.
[0008]
Further, a surge protection circuit 14 having an arrester for preventing a surge propagating through the cable from directly entering the repeater component 13 is disposed in the conductor cylinder 12. It is electrically connected to the power supply line 15 disposed in the conductor cylinder 12 via the surge protection circuit 14. The power supply line 15 is drawn out through feedthroughs 16 provided at both ends of the pressure-resistant housing 10 and connected to a cable. The feedthrough 16 is arranged to draw out the power supply line 15 from the inside of the repeater 1, but is adapted to withstand the water pressure on the seabed like the pressure-resistant casing 10. Reference numeral 17 denotes a protective cover that covers both ends of the pressure-resistant housing 10.
[0009]
For example, in a submarine cable system, it is necessary to supply power to the repeater over long distances such as between continents, so a positive DC high voltage is applied to one landside station and a negative DC high voltage is applied to the other land station. A high voltage is applied, and a constant current flows according to the respective potential differences and the impedance of the repeater connected to the cable system to operate the circuit inside the repeater.
[0010]
Therefore, in a repeater near the land, the potential of the feeder line is high during the operation of the system, and therefore, the feeder line 15 inside the repeater is selected to be able to withstand the high DC voltage. A coated DC high voltage cable is used. In addition, since the repeater component 13 also has a high DC voltage, the insulating cylinder 11 is provided so as to withstand insulation against a submarine potential (normally, a ground potential).
[0011]
In the repeater 1, as shown in FIG. 1, a work window 18 for manufacturing the repeater component is provided for disposing a transistor and a Zener diode which are semiconductor elements provided in a relay circuit inside the repeater component 13. . In some cases, a lightning surge propagating through the cable and entering the buried on-land cable, a shunt surge due to a cable failure, a surge at the time of switching the branch unit, and the like enter the repeater 1. However, normally, even if a surge propagated through the cable enters the repeater 1, the surge is prevented from directly entering the repeater component 13 by the arrester inside the surge protection circuit 14 provided in the repeater 1. Has become.
[0012]
However, even if the arrester of the surge protection circuit 14 operates, the surge does not directly enter the relay circuit, but the surge voltage and current propagate to the power supply line 15 in the conductor cylinder 12, so that electromagnetic coupling or electrostatic induction occurs. There is a possibility that a surge may enter through the working window 18 of the repeater component 13. When the surge enters due to the above-described causes, not only may the relay circuit malfunction, but in the worst case, the internal elements of the repeater may fail.
[0013]
Therefore, the first embodiment of the present invention is characterized in that the feeder line 6 crossing over the repeater component 13 of the repeater 1 is wrapped with a surge suppressing conductor 19 which is a conductor having a certain thickness. The material of the surge suppression conductor 19 is iron, copper, SUS, silver, brass, aluminum, or the like. Although the surge suppression conductors 19 are kept at the same potential as each of the repeater components 13, the surge suppression conductors 19 are independent for each corresponding repeater component 13 because all the repeater components 13 have different potentials. As a result, each relay component 13 is maintained at the same electric potential. That is, the surge suppression conductors provided on the feeder line portion corresponding to the adjacent repeater component are electrically insulated from each other. Although not shown, the surge suppression conductor 19 and the conductor cylinder 12 are insulated through a suitable insulator.
[0014]
According to the above configuration, the feeder 15 arranged across each repeater component 13 is surrounded by the surge suppression conductor 19 over the entire length of the section crossing the repeater component 13 as shown in the figure. Therefore, there is no electrostatic or electromagnetic coupling between the feeder line 15 and the repeater component 13. Therefore, the propagating surge does not enter the relay circuit of the repeater component 13.
[0015]
In the configuration of FIG. 1, the surge suppression conductor 19 is kept at the same potential as the repeater component 13, but an insulating sheet such as a Mylar sheet or Teflon (registered trademark) is provided between the surge suppression conductor 19 and the repeater component 13. ) The surge suppression conductor 19 and the conductor cylinder 12 are insulated by a sheet, a polyethylene sheet, and a mica sheet, and the respective surge suppression conductors 19 are electrically connected to each other and one end thereof is electrically connected to the conductor cylinder 12. Even if it is kept at the same potential, the surge protection function works effectively.
[0016]
By adopting such a configuration, a surge does not enter the relay circuit board in the repeater component due to electrostatic induction or electromagnetic coupling, and a highly reliable repeater can be manufactured.
[0017]
Embodiment 2 FIG.
FIG. 2 (a) is a plan sectional view showing a repeater according to Embodiment 2 of the present invention. FIG. 2B is an enlarged side cross-sectional view showing the main part of FIG. 2A rotated by 90 degrees about a concentric axis. In the figure, the same elements as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 2, a section from the point where the power supply line 15 is drawn into the conductor cylinder 12 to the surge protection circuit 14 is covered with one continuous surge suppression conductor 20. The surge suppression conductor 20 is made of a conductor having the same material and a certain thickness as the surge suppression conductor 19 of the first embodiment. Further, the surge suppression conductor 20 is insulated from all the repeater components 13 by the insulator 21 inserted between the surge suppressor 13 and the adjacent repeater components 13 so as not to be short-circuited. ing. One end of the surge suppression conductor 20 is connected to the conductor cylinder 12 to have the same potential as the conductor cylinder 12. With this configuration, a surge propagating in the feeder inside the repeater is prevented from entering the repeater circuit inside the repeater component 13 by electrostatic coupling and electromagnetic induction.
[0018]
By adopting the above configuration, it is possible to protect against surge intrusion into the relay circuit board by electrostatic induction and electromagnetic induction while maintaining insulation between repeater components, making it possible to manufacture highly reliable repeaters And Further, since the surge suppression conductor does not need to be divided for each repeater component, the production is facilitated.
[0019]
Embodiment 3 FIG.
FIG. 3 is a plan sectional view showing a repeater according to Embodiment 3 of the present invention. In the figure, the same elements as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the third embodiment, a surge suppression conductor 22 surrounding only a part of the feeder line 15 on the repeater component 13 is arranged. The surge suppression conductor 22 is made of the same material as the surge suppression conductor 19 of the first embodiment and has a certain thickness, and is maintained at the same potential as the repeater component 13. The interval L between the surge suppression conductor 22 corresponding to one repeater component and the surge suppression conductor 22 corresponding to an adjacent repeater component is set to a constant interval.
[0020]
With this configuration, electromagnetic waves having a frequency of 4 / L or less with respect to the arrangement interval L of the surge suppression conductors 22 are not radiated from the feeder line 15. Therefore, when the frequency of the ingress surge is limited, it is possible to reliably and inexpensively prevent surge intrusion by using the above configuration.
[0021]
A high-speed surge voltage / current at the time of cable shunt becomes a problem, and it is generally considered that the frequency is at most about 100 MHz. For example, in order to prevent a surge voltage of 100 MHz or less, it is sufficient that the interval of L is 75 cm. To prevent a surge of 1 GHz or less, the interval of L is set to 7.5 cm. Each of the surge suppression conductors 22 is electrically connected to the repeater component 13 and is insulated from the conductor cylinder 12 by an insulating sheet or the like.
[0022]
By adopting the above configuration, when the surge frequency entering the repeater can be predicted, the surge suppressor becomes simpler, so that a cheap and highly reliable repeater can be manufactured.
[0023]
Embodiment 4 FIG.
Or, conversely, as shown in FIG. 4, the surge suppression conductor 22 and the repeater component 13 are insulated by an insulator 21 and the respective surge suppression conductors 22 are set to the same potential as the conductor cylinder 12. Has the effect of
[0024]
By adopting the above configuration, when the surge frequency entering the repeater can be predicted, the surge suppressor becomes simpler, so that a cheap and highly reliable repeater can be manufactured.
[0025]
Embodiment 5 FIG.
FIG. 5 is a sectional view of the repeater according to the fifth embodiment. In the fifth embodiment, a surge suppression conductor 23 in which the surge suppression conductor of FIG. 1 is fixed to and integrated with the repeater component 13 in the conductor cylinder 12 of the repeater 1 is used. In this case, the repeater component 13 and the surge suppression conductor 23 may be made of the same metal or may be made of different metals. Since each repeater component 13 in the repeater 1 has a different electric potential, the conductor cylinder 12 is insulated from the conductor cylinder 12 by an insulator sheet or the like. By employing such a configuration, the relay circuit in the repeater component 13 can be protected from a surge entering the repeater 1, and a highly reliable repeater can be provided.
[0026]
By employing the above configuration, it is possible to manufacture a mechanically strong and highly reliable repeater.
[0027]
【The invention's effect】
As described above, according to the repeater of the present invention, it is possible to suppress the adverse effect on the components of the repeater due to the surge entering from the feeder line, and to enhance the reliability of the repeater.
[Brief description of the drawings]
FIG. 1A is a plan sectional view of a repeater according to Embodiment 1 of the present invention, and FIG. 1B is an enlarged sectional view taken along line AA ′.
FIG. 2A is a plan sectional view of a repeater according to Embodiment 2 of the present invention, and FIG. 2B is a side sectional view of a main part, which is enlarged by rotating the repeater by 90 degrees.
FIG. 3 is a plan sectional view of a repeater according to Embodiment 3 of the present invention.
FIG. 4 is a side sectional view S of a main part of a repeater according to Embodiment 4 of the present invention.
FIG. 5 is a sectional view of a repeater according to Embodiment 5 of the present invention.
[Explanation of symbols]
1 repeater, 10 pressure-resistant housing,
11 insulation cylinder, 12 conductor cylinder,
13 repeater components, 14 surge protection circuit,
15 feeder line, 16 feedthrough,
17 cover 18 working window,
19 Surge suppression conductor, 20 Surge suppression conductor,
21 insulator, 22 surge suppression conductor,
23 Surge suppression conductor.

Claims (8)

An insulating cylinder inside, a cylindrical pressure-resistant housing in which a conductor cylinder is further disposed, a plurality of repeater components accommodated in the conductor cylinder via an insulator, and a withdrawal from the outside of the pressure-resistant housing A power supply line for supplying power to the repeater component, and a surge suppression conductor made of a conductor surrounding the power supply line to protect the repeater component from a surge entering through the power supply line. And a repeater. 2. The repeater according to claim 1, wherein the surge suppression conductor is provided over substantially the entire length of a feeder line traversing each of the repeater components and independently for each repeater component. A repeater characterized by being kept at the same potential as a component. 3. The repeater according to claim 2, wherein the surge suppression conductor is fixed to the repeater component. 2. The repeater according to claim 1, wherein the surge suppression conductor is provided over substantially the entire length of a feeder line traversing the repeater component and independently for each repeater component, and the corresponding repeater component. Characterized by being insulated from the conductor cylinder and being kept at the same potential as the conductor cylinder. 2. The repeater according to claim 1, wherein the surge suppression conductor is provided continuously over substantially the entire length of a feeder line crossing a plurality of repeater components, and is maintained at the same potential as the conductor cylinder. A repeater characterized by being insulated from a repeater component. 2. The repeater according to claim 1, wherein the surge suppression conductor is provided on a part of a feeder line traversing the repeater component and is fixed between the surge suppression conductor provided on an adjacent repeater component. A repeater having an interval of: 7. The repeater according to claim 6, wherein the surge suppression conductor is kept at the same potential as the repeater component, and is insulated from the conductor cylinder. 7. The repeater according to claim 6, wherein the surge suppression conductor is insulated from the repeater component and is kept at the same potential as the conductor cylinder.

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