JPH0470127A - Power feeding path switching circuit for underwater branching device and feeding method for submarine cable communication system - Google Patents

Abstract

PURPOSE:To restore communication between residual cables even when a fault is generated at any one of submarine cables to be connected to the device by making same the operational current directions of first - third relays in the case of observing it from the coupling point of Y-shaped electric paths. CONSTITUTION:The driving part 107L of the first relay 107 is arranged at a first electric path 101, and a switching part 107C grounds a second connecting terminal 105 while disconnecting it from a second electric path 102. The driving part 108L of the second relay 108 is arranged at a second electric path 102, and a switching part 108C grounds a third connecting terminal 106 while disconnecting it from a third electric path 103. The driving part 109L of a third relay 109 is arranged at the third electric path 103, and a switching part 109C grounds a first connecting terminal 104 while disconnecting it from a first electric path 101. Then, the operational current directions of the first - third relays 107-109 are made the same in the case of being observed from the coupling point of the Y-shaped electric paths. Thus, even when the fault is generated at any one of submarine cables to be connected to the device, communication can be restored between the residual cables.

Description

[Detailed Description of the Invention] [Summary] A power supply path switching circuit for an underwater branching device in a submarine cable communication system that branches a submarine cable underwater and communicates between three or more landing stations, and this power supply path switching circuit. Regarding the power supply method using , even if a failure occurs in any of the submarine cables connected to the underwater branching device, communication can be restored between the remaining cables, and the power supply route that is set up has power supply at both ends as much as possible, and The purpose is to make the power supply route setting procedure relatively simple, and to ensure that the set power supply route does not change even if a failure occurs on the cable during operation.

Undersea branching device that connects the first, second, and third electric paths in a Y-shape and has first, second, and third connection terminals arranged at each tip for connecting to the power supply path of the submarine cable, respectively. In the power supply path switching circuit, the first relay has a driving part disposed in the first electrical path and the switching part disconnects the second connection terminal from the second electrical path and grounds it; A second relay whose driving part is disposed in the second electrical path and whose switching part disconnects the third connection terminal from the third electrical path and grounds it; The switching part is arranged in the third electric path, and the switching part disconnects the first connection terminal from the first electric path and grounds it. 2. The third relay is configured so that the operating currents flow in the same direction.

[Industrial Application Field] The present invention relates to a power supply line switching circuit for an underwater branching device in a submarine cable communication system that branches a submarine cable underwater and communicates between three or more landing stations, and this power supply line switching circuit. This invention relates to a power supply method using a circuit.

In submarine cable communication systems, especially optical submarine cable communication systems, optical submarine cables are equipped with optical repeaters at intervals, and these optical repeaters transmit constant DC current through the power supply line in the optical submarine cable. Powered. There are two types of power feeding methods: single-ended feeding, in which power is fed from only one landing station, and double-ended feeding, in which power is fed from two landing stations.
As a power supply system, it is desirable to use a more reliable double-end power supply, and it is also possible to switch the power supply route so that the power supply route is reset to a double-end power supply route as much as possible even in the event of a failure of the power supply route. desired.

[Prior Art] FIG. 18 shows an example of an optical submarine cable communication system with single-end power feeding. As shown, landing station A and landing station 8
The optical submarine cable OMC is connected to the optical submarine cable OMC, on which optical submarine M1 REPs are arranged at predetermined intervals and an underwater branching device BU is installed. The cable OMC is branched to enable communication with three or more landing stations.

In the system shown in FIG. 18, the power supply lines of the optical submarine cables OMC from each landing station A, B, and C are connected to the underwater ground at the underwater branch unit BU. This creates a power supply line between the power supply device of landing station A and the underwater branching device 80, a power supply path between the power supply device of landing station B and the underwater branching device BLI, and a power supply path between the power supply device of landing station C and the underwater branching device 80. The power supply paths are formed independently, and each power supply path is a single-ended power supply in which power is supplied only from the landing station A side, only from the landing station B side, or only from the landing station C side. ing.

In this single-ended power supply method, if the power supply device of a landing station breaks down, it is impossible to supply power from the power supply device of another landing station in place of the failed power supply device. , each landing station A and H has a working power supply and a backup power supply device installed.

It is necessary to keep it in place.

FIG. 19 shows an example of an optical submarine cable communication system with power feeding at both ends. As shown, landing station A and landing station 8
The optical submarine cable OMC is connected to the optical submarine cable OMC between the optical repeater RE P and the underwater branching device B T.
Attach -1. Unlike the case of single-end power feeding, this underwater branching device B Ll connects the power feeding path of the optical submarine cable OMC without being grounded underwater to form a power feeding path between landing stations A and 8.

The power feeding devices of landing stations A and B are configured so that when one has positive polarity, the other feeds negative polarity current, and as a result, the power feeding path of optical submarine cable OMC is connected to landing stations A and B. Power is supplied from both sides. In this double-ended feeding method,
Even if one of the power supply devices at landing stations A and B fails and power cannot be supplied, the remaining power supply device at the other landing station can supply power to the entire load. There is no need for a backup power supply device at the landing station.

In this way, between the 1-'l end feeding method and the both end feeding method,
A double-end power supply method is desirable from the viewpoints of reliability, economy, operating voltage, etc.

FIG. 20 shows a schematic configuration of the underwater branching device. As shown in the figure, the underwater branching device B Li mainly consists of an optical fiber circuit and a power supply circuit, the optical fiber circuit is coupled to the optical fiber transmission line in the optical submarine cable, and the power supply circuit is connected to the optical submarine cable. connected to the power supply line. This underwater branching device B IJ accommodates three optical submarine cables, and allows branching to three landing stations A, B, and C with ease. As shown in Figure 21, optical fiber circuits include: ■Optical fiber branch circuit, ■Optical repeater circuit +
Optical fiber branch circuit, ■Optical fiber branch/switching circuit, ■
Combinations such as optical repeater circuit + optical fiber branching/switching circuit, (1) optical repeater circuit 10-multiplex conversion circuit, (2) optical repeater circuit ->-optical fiber part@/switching circuit + multiplex conversion circuit, etc. are possible.

Currently, in the optical submarine cable communication system that communicates between three or more landing stations, the power feeding path is set by switching the power feeding path switching circuit in the underwater branching device under control from the landing station, and either one end is fed or both ends are fed. Power is being supplied.

Various types of such power supply path switching circuits have been proposed, such as the time-open γ2-53 shown in FIG.
The power supply line switching circuit described in JP-A No. 332, the power supply line switching circuit described in JP-A-1-200832 shown in FIG. 23, and JP-A-63-189025 shown in FIG.
There is a power supply path switching circuit described in the publication.

[Problem to be solved by the invention] The power supply line switching circuit described in Japanese Patent Laid-Open No. 63-189025 shown in Fig. 24 is a circuit currently in practical use. If there is a fault somewhere on two specific submarine cables (the submarine cables to landing station B or C), switch the power supply path and connect the two remaining submarine cables. Although it is possible to disrupt communications by 19 days, if a failure occurs on one particular cable (the submarine cable of landing station A), the power supply line must be disconnected between the remaining two cables. However, there is a problem in that the system is down, that is, communication is not possible at all.

The power supply line switching circuit described in Japanese Patent Application Laid-Open No. 1-200832 shown in Fig. 23 is such that even if a fault occurs in any of the three submarine cables connected to the south-central branching device BU, the power supply line switching circuit shown in FIG. i
Communication can be restored between FM bottom cables. However, since all the power supply lines are configured to be grounded to the underwater earth at each intermediate branch device, the power supply from each landing station is only fed at one end, which poses a problem in the reliability of the system. .

The power supply line switching circuit shown in Fig. 22, described in Japanese Patent Application Laid-open No. 2 53332, can restore communication between the remaining two cables even if a fault occurs in any cable, similar to the one described in 1. However, this power supply path switching circuit has a problem in that the circuit configuration is complicated and the procedure for setting the power supply path is also complicated.

The present invention was made in view of the technical problems described above, and its purpose is to ensure that even if a fault occurs in any submarine cable connected to an underwater branching device, the remaining cables will be connected to each other. Communication can be restored, and the power supply route that is set up is powered at both ends as much as possible, the procedure for setting up the power supply route is relatively simple, and even if a failure occurs on the cable during operation, the set power supply route can be changed. The goal is to avoid doing so.

[Means to solve the problem] FIG. 1 is a diagram explaining the principle of the present invention.

In order to achieve the above-mentioned object, a power supply path switching circuit for an underwater branching device according to the present invention has a first mode, a second mode, and a second mode.
, in order to connect the third electrical path 101, 102, 103 in a Y-shape (however, this is in the sense of an electrical circuit, not a specific shape) and connect each tip to the power supply path of the submarine cable. The first, second and third connection terminals 104.105.1 of
In the power supply path switching circuit of the underwater branching device in which 06 is arranged, the first relay 107, whose driving part 107L is arranged in the first electrical path 101, and whose switching part 107C connects the second connection terminal 105 to the first electrical path 101. A second relay 108 whose driving portion 108L is disposed in the second electric path 102 and whose switching portion 108C connects the third connecting terminal 106 to the third Electrical path 10
3 and the third relay 109.
The drive section 109L is disposed on the third electrical path 103, and the switching section 109C disconnects the first connection terminal 104 from the first electrical path 101 and grounds it. The first, second and third relays 107, 108, 109 seen from the connection point of roads 101, 102, 103
The directions of the operating currents are the same.

Further, the power supply line switching circuit of the underwater branching device according to the present invention is as follows:
As a second form, in addition to the above-mentioned first form, a fourth relay 110 whose driving part 110L is a switching part 107C of the first relay 107 in the second electric path 102 is provided.
and the ground, the first switch part 1
1.0C forms a self-holding circuit, and the fifth relay 111 whose driving portion 111L connects to the third electrical path 1.
The first switch unit 11, I
C forms a self-holding circuit.

Furthermore, as a third form, the power supply line switching circuit for an underwater branching device according to the present invention further has the following features in addition to the above-mentioned second form:
The sixth relay 112 whose driving part 11.2L is the switching part 1 of the third relay 109 in the first electrical path 101
09C and the ground, and the first switch section 112c forms a self-holding circuit.

Further, as a fourth embodiment of the underwater branching device according to the present invention, in the second embodiment, the fourth relay 110 simultaneously connects the second electrical path to the second electrical path. Drive unit 108L of relay 108 and relay 107
The second switch section (11
0C), and the fifth relay 111 is connected to the first
At the same time, the third electrical path is connected to the switch section 111C of the third relay 109 and the switching section 1O8C of the relay 108.
It further includes a second switch section 111C that opens between the two.

Furthermore, the power supply line switching circuit for the underwater branching device according to the present invention includes:
As a fifth form, in the third form, the sixth relay 112 simultaneously operates the first switch section 112C.
It further includes a second switch section that opens the first electrical path between the drive section 107L of the first relay 107 and the switching section 109C of the relay 109.

Further, the power feeding method for a submarine cable communication system according to the present invention is one form of a power feeding method for a submarine cable communication system in which a submarine cable is branched using an underwater branching device to connect three or more landing stations. The power feeding device of the landing station is equipped with a feeding polarity switching mechanism, the feeding path switching circuit of the first, third or fifth form is used as the feeding path switching circuit of the underwater branching device, and the first feeding path switching circuit of the feeding path switching circuit is , second
, after performing power supply at both ends between the landing stations connected to any two of the third connection terminals 104, 105, and 106, one end is supplied to the landing station connected to the remaining one connection terminal. A power supply path is formed by supplying power.

In addition, the power supply method for a submarine cable communication system according to the present invention is, as another form, a power supply method for a submarine cable communication system in which a submarine cable is branched by an underwater branching device to connect three or more landing stations. The power feeding device of the landing station is equipped with a feeding polarity switching mechanism, and the power feeding path switching circuit of the above-mentioned second or fourth form is used as the feeding path switching circuit of the five underwater branching devices, and the first and fourth modes of the feeding path switching device are between the landing stations connected to the connection terminals 104 and 105 of 2 or between the 1st and 3rd
After performing both-end power feeding between the landing stations connected to the connecting terminals 104 and 106 of the terminals 104 and 106, a power feeding path is formed by performing one-end power feeding at the landing station connected to the remaining one connecting terminal, and both-end power feeding is performed. If a failure occurs in the power supply between landing stations that are connected to the faulty power supply line, power is supplied at both ends between the landing stations connected to the remaining two connection terminals other than the connection terminal connected to the faulty power supply line. This method forms a power supply path while separating the faulty power supply path.

Furthermore, the power supply method for a submarine cable communication system according to the present invention is, as another form, a power supply method for a submarine cable communication system in which a submarine cable is branched by two or more underwater branching devices to connect four or more landing stations. , the power feeding device of each landing station is equipped with a feeding polarity switching mechanism, the feeding path switching circuit of any one of the first to fifth forms described above is used as the feeding path switching circuit of the underwater branching device, and the first connection terminal 10
The route connecting multiple power supply route switching circuits via a submarine cable connected to , one-end power is supplied from another landing station to form a power supply path.

Furthermore, in the power feeding method for a submarine cable communication system according to the present invention, in the power feeding method for forming the main power feeding path, the first relay and the second or third relay of the plurality of power feeding path switching circuits each have an operating current. The first relay and the second or third relay of each power supply path switching circuit are sequentially driven by setting the relays to be different and changing the power supply current flowing through the main power supply path.

Furthermore, in the power feeding method for a submarine cable communication system according to the present invention, in the power feeding method for forming the main power feeding path, a power feeding path switching circuit having a circuit configuration other than the power feeding path switching circuit of the present invention described above as a power feeding path switching circuit is provided. A power supply path is formed using the following.

[Function] As a basic power supply method using the power supply path switching circuit of the underwater branching device of the first or third form according to the present invention, in normal times, the first, second, and Both ends of the landing station are connected to any two of the connection terminals 104, 105, and 106 of No. 3, and the terminals are connected to the remaining connection terminals by relays on the two-end feed path. Ground the submarine cable power supply path to the underwater earth. After this, a power supply path is formed by performing one-end power supply at the landing station connected to the remaining one connection terminal. Fourth,
When there are fifth and sixth relays, these relays form a self-holding circuit, and even if the power supply on the both-end feed path side is stopped, the one-end feed path will not be switched.

The basic power supply method using the power supply line switching circuit of the underwater branching device according to the second embodiment of the present invention is as follows: Between the stations or the first and third connection terminals 104, 106
Power is supplied at both ends between the landing stations connected to the switching unit 108C or the switching unit 107C, thereby grounding the submarine cable connected to the third connection terminal 106 or the second connection terminal 105 to the underwater earth. After this, a single-end power supply is performed at the landing station connected to the remaining one connection terminal 106 or 105, thereby forming a power supply path. At this time, this one-end power supply path is connected to the fifth relay 111 or the fourth relay 1.
Self-maintained by 10. Furthermore, if a fault occurs in the power supply line between landing stations that are feeding power at both ends, the power supply between the landing stations connected to the remaining two connection terminals other than the connection terminal connected to the faulty power supply line A power supply path is formed by supplying power to both ends and disconnecting the faulty power supply path.

When using the power feed line switching circuits of the first, second, and third embodiments of the present invention in a submarine cable communication system in which a submarine cable is branched by two or more underwater branching devices to connect four or more landing stations. In this case, a route connecting multiple power supply route switching circuits via a submarine cable connected to a first connection terminal is used as a main power supply route, and a route between two landing stations connected via this main power supply route is used. After supplying power at both ends at , supplying power at one end from another landing station to form a power supply path.

(Margin below) [Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a power supply line switching circuit for an underwater branching device as an embodiment of the present invention. This embodiment is applied to an optical submarine cable communication system, and only the power supply switching circuit excluding the optical fiber circuit is shown in the figure. This power supply path switching circuit is a three-way power supply system that allows you to secure a power supply path using the remaining two cables even if there is a failure in any of the three optical submarine cables connected to the underwater branching device. It is a switching type.

In Fig. 2, BU is an underwater branching device, and has three connection terminals TI, T2, and T3.
are connected to landing station A, respectively, via the optical submarine cable feed line.
Connected to power supply devices B and C. Here, landing stations A, B,
The power supply devices C are each configured to be able to switch the polarity of the power supply current to either positive or negative and supply it to the power supply path of the optical submarine cable.

The power supply circuit of the underwater branch unit BU includes the electric path ■, the opening,
(2) are connected in a Y-shape, and the aforementioned connection terminals T1, T2, and T3 are connected to the ends of each electric path I, (2), and (2), respectively. The drive coil of relay RLI (hereinafter referred to as relay coil RL1) is inserted into the electric path T, and the electric path ■
is the drive coil of relay RL2 (hereinafter referred to as relay coil R).
) is inserted, and relay RL3 is inserted in the electrical path ■.
A drive coil (hereinafter referred to as relay coil RL3) is inserted. Switching contact rβ of relay RLI is an electric path
The break contact side of this switching contact rI21 is arranged between the connecting terminal T2 and the relay coil RL2 in the connecting terminal T2.
2 and relay coil RL2, the make contact side is connected to terminal T2.
and ground. Similarly, switching contact rβ2 of relay RL2 connects connecting terminal T3 in electric path m to relay coil R.
The break contact side of this switching contact rJ22 is inserted between the connecting terminal T3 and relay coil RL3, and the make contact side is inserted between the connecting terminal T3 and ground. Similarly, switching contact r! of relay RL3! 3 is inserted between the connection terminal TI and the relay coil RLI in the electric path ■, the break contact side of this switching contact rI23 is inserted between the connection terminal T] and the relay coil RL1, and the make contact side is inserted between the connection terminal T1 and the ground. be done.

Each of the relays RLI, RL2, and RL3 is driven only when an operating current (moving current) flows in the direction indicated by the arrow in the figure. That is, it is driven when a current flows in the direction of each connection terminal Tl, T2, and T3 when viewed from the connection point of the electric path connected in a Y-shape. This relay RLI, RL
2. As RL3, a high voltage relay such as a vacuum relay is used.

Hereinafter, each landing station A will be
, B, and C to the optical submarine cable will be explained with reference to FIG.

First, as shown in FIG. 3(a), when no power is supplied, contacts r91, r122, .
r123 connects the connection terminal and the relay coil.

Therefore, all the power feeding paths are insulated from seawater during this non-power feeding period, which is an advantageous configuration for conducting DC insulation resistance tests.

Next, as shown in Figure 3 (b), power is supplied between landing station A and landing station B, and the power supply current is passed in the direction of the arrow in the figure.
This energizes relay RL2. As a result, a power supply path is formed between the landing station A and the landing station B in which power is supplied at both ends. Furthermore, by energizing the relay RL2, its switching contact rff2 is switched to ground the connection terminal T3 (that is, the power supply path of the optical submarine cable from the landing station C) to the underwater earth.

Furthermore, after this, as shown in FIG. 4(C), power is supplied from the landing station C to perform one-end power supply to the optical submarine cable on the landing station C side using the underwater ground.

Since this example device has a symmetrical Y-shaped circuit configuration, the fourth configuration of the power supply path that can be set under normal conditions is
Three configurations shown in the figure are possible. In other words, Fig. 4 (
As shown in b), landing station A (positive current) and landing station B (
As shown in Figure 4 (b), a configuration in which power is supplied at both ends between terminals (negative current) and one terminal current is supplied at landing station C (negative current), is shown in Figure 4 (b).
Both ends are fed between (positive current) and landing station C (negative current), landing station A
(negative current), and as shown in Figure 4 (c), both ends of the current are fed between landing station C (positive current) and landing station A (negative current), and landing station B This is a form in which power is supplied at one end (negative current).

Therefore, in this example device, even if a fault occurs in any of the three optical submarine cables, the faulty optical submarine cable can be disconnected from the Y':j: type power supply path, and the remaining two optical submarine cables can be It is possible to supply power at both ends between submarine cables.

Another embodiment of the invention is shown in FIG. The second above
In the example device shown in the figure, if a fault occurs in the feed line at both ends, the relays on the feed line at both ends in the feed line switching circuit are deenergized, so the switching contact on the feed line at one end in the feed line switching circuit is turned off. It returns from the ground side to the relay coil side. In other words, when the two-end feed path fails, the remaining one-end feed path is switched. The embodiment shown in FIG. 5 is designed to prevent such a power supply line from being cut off.

That is, the embodiment device shown in FIG. 5 is different from the embodiment device shown in FIG. 2 in that each of the electric paths I, ①, ② has relays RL4, RL5, and RL6 for self-maintenance of the grounding path. Here, in the relay RL4, a relay coil is arranged in the path between the switching contact r121 and the ground in the electric path H, and its make contact rj25-2 is inserted in parallel with the meter contact side of the switching contact rffl as a contact forming a self-holding circuit. The break contact is connected to the switching contact rI21 and the relay coil RL.
It is inserted between the two.

The other self-holding relays RL5 and RL6 have similar configurations in the electric paths IU and I, respectively.

These relays R14 to RL6 are driven only when an operating current flows in the direction indicated by the arrow in the figure.

As mentioned above, these relays RL4, RL5, RL6
This is to prevent the power supply path from being interrupted in the event of a failure in the optical submarine cable that supplies power at both ends during operation, and the make contact becomes a self-holding contact.
The break contact is a contact that prevents the switching contact from being damaged by arc discharge that occurs in the contact when the switching contact returns to the relay coil side. During the self-holding of the relay, the switching contact is closed from the relay coil side by the break contact. It is meant to be separated. A relay with such a function is also described in the above-mentioned Japanese Unexamined Patent Publication No. 189025/1983.

The procedure for setting the power supply path using the device of the embodiment shown in FIG. 5 is the same as that of the device of the embodiment shown in FIG. 2 described above. In other words, as shown in Figure 6 (a), relays RLI and R
Switching contacts rP1, rβ2, rj23 of L2, RL3 are connected to the relay coil side, and self-holding relays RL4,
Since the meter contacts of RL5 and RL6 are open, all feed lines are insulated from seawater.

First, as shown in FIG. 6(b), power is supplied at both ends between landing station A and landing station 8, thereby driving relay RL2 and connecting the optical submarine cable to landing station C. Ground to underwater earth. Next, as shown in FIG. 6(C), one-end power is supplied from landing station C to energize relay RL5, close its self-holding make contact rβ5-2, and break contact rff5- Open 1 (.

When a self-holding circuit is formed by relay RL5 in this way, as shown in FIG. 7, for example, a failure occurs in the optical submarine cable on the landing station A side, relay RL2 is deenergized, and switching contact rρ2 Even if relay RL5 is disconnected from the ground side, relay RL5 continues to be energized via its own make contact rf25-2, so relay RL5's break contact r
ff5-1 continues to disconnect the optical submarine cable on the relay coil RLa side and the landing station C side, and can prevent the power supply path on the landing station C side from being switched due to a failure in the optical submarine cable on the landing station A side. In this way, damage to the contacts due to arc discharge can also be prevented.

FIG. 8 shows three forms of the power supply path that can be set during normal operation of the apparatus of the embodiment shown in FIG. That is, the eighth
As shown in figure (a), power is supplied at both ends between landing station A and 8.
One-end power supply mode at landing station C, two-end power supply mode between landing station B and 0 as shown in Figure 8 (B), one-end power supply mode at landing station A, and Figure 8 (C). Landing station C as shown in
There are three types: power is supplied at both ends between A and A, and power is supplied at one end at landing station B.

FIG. 9 shows yet another embodiment of the invention. This embodiment device is obtained by removing the self-holding relay RL6 on the landing station A side from the embodiment device shown in FIG. 5, thereby reducing the number of device parts. The procedure for setting the power supply path in this embodiment of FIG. 9 is the same as in the previous embodiment. In the case of the configuration of the embodiment shown in FIG. 9, the form of the power feeding path set during normal times becomes two types by changing the positive and negative polarities of the power feeding device of each landing station. In other words, there are two types of power feeding between landing station A (positive current) and landing station B (negative current), one-end power feeding at landing station C (negative current), and one type of power feeding between landing station C (positive current) and landing station B (negative current). Both ends are fed between stations A (negative current),
This is a single-end power supply mode at landing station B (negative current).

Also in the case of the apparatus according to the embodiment shown in FIG. 9, even if any of the three optical submarine cables has a failure, it is possible to feed power at both ends using the remaining two optical submarine cables. For example, if a failure occurs in the optical submarine cable on the landing station A side, power supply from all landing stations is temporarily stopped, and then landing station B (positive current) and landing station C (negative current) By supplying power to both ends between
3, disconnect the optical submarine cable on the landing station A side where the problem occurred from the power supply line.

Each of the embodiments described above is for supplying power to an optical repeater attached to each optical submarine cable via the power supply line of the optical submarine cable. It is also possible to use this power supply line to supply power to the power supply section of the optical fiber circuit of the underwater branching equipment in order to switch the optical fiber transmission line within the underwater branching equipment or to supply power to the relay circuit within the equipment. , FIG. 10 shows the circuit configuration in that case. In this embodiment, a power supply circuit for the optical fiber circuit is attached to the apparatus of the embodiment shown in FIG. Place. This optical fiber circuit power supply circuit PS consists of four diodes D1 . It consists of D2, D3, D4 and an optical fiber circuit power supply section PW, and is configured so that the current flowing to the Y-shaped junction point flows to the power supply section PW of the optical fiber circuit via these two diodes. This power supply circuit for an optical fiber circuit is configured such that power can always be supplied to the optical fiber circuit power supply section PW no matter how the power supply path of the power supply path switching circuit is switched in three directions.

FIG. 11 shows the overall configuration of an optical submarine cable communication system using the apparatus of the embodiment shown in FIG. Here, the optical submarine cables branched by the underwater branching device BLI are connected to landing stations A, B, and C, respectively, and the power feeding devices of each landing station A, B, and C have a function of reversing the feeding polarity. There is. Also the 12th
FIG. 11 shows a configuration in which an optical fiber circuit power supply circuit PS is added to an underwater branching device BU in an optical submarine cable communication system. The operation of these systems is the same as that described with respect to the FIG. 5 apparatus.

Similarly, FIG. 13 shows the overall configuration of an optical submarine cable communication system using the device of the embodiment shown in FIG. 9, and FIG. 14 shows the system shown in FIG. The configuration is shown.

The operation of these systems is the same as that described with respect to the FIG. 9 apparatus.

In Fig. 15, an optical submarine cable is branched using two underwater branching devices BUI and BU2, and four landing stations A, B, C,
A power supply circuit of an optical submarine cable communication system that enables communication between D and D is shown. Here each underwater branching device BL
J1. The device of the embodiment shown in FIG. 9 is used as the power supply path switching circuit of BU2. Between underwater branching devices BtJ1 and 802,
Optical submarine cables connect terminals that do not have self-holding relays. Of course, as shown in FIG. 16, each underwater branching device BU1. B[
It is also possible to add a power supply circuit for the optical fiber circuit to J2.

The procedure for setting the power supply path in this power supply system is to first supply power at both ends between landing station A (positive current) and landing station C (negative current), and then connect the underwater branch unit BU2 to the subsea branch unit BU2. Relay RL2■ of BUI is energized, thereby connecting the optical submarine cable power supply line from landing station B to underwater grounding at underwater branch unit BU2, and also connecting the optical submarine cable power supply line from the landing station to underwater branch unit BUI. Undersea earthing at
After that, one-sided power is supplied from each landing station B and D.

FIG. 17 shows power supply paths that can be set in the system shown in FIG. 15 or 16 during normal times and during failures. In Figure 17, (a) and (b) are power supply routes that can be set during normal times, (c) to (g) are power supply routes that can be set in the event of a cable failure, and optical submarine cables that can be used for power supply are indicated by solid lines. It is.

The arrow represents the power feeding direction. Optical submarine cables that are unusable due to failure are indicated by dotted lines.

First, the power supply lines that can be set during normal times are as shown in Figure 17 (
A) Both ends of power are supplied between landing station A and 0 shown in (b), landing station B,
C has one-end power feeding mode, the landing station 8 shown in FIG.

If a failure occurs in the optical submarine cable from landing station C or the optical submarine cable from landing station A, change the power supply route to the power supply route shown in Figure 17 (c) or (f). Switch. That is, power is supplied at both ends between the landing station and the landing station 8, and power is supplied at one end at the remaining landing station B or C.

If a failure occurs in the optical submarine cable on the landing station side or the optical submarine cable from landing station B, the cable between landing station A and Power is supplied at both ends, and power is supplied at one end at the remaining landing station B or D.

If a failure occurs in the optical submarine cable connecting submarine branching equipment BUI and 802, as shown in Figure 17 (g), between landing stations B and A, and between landing stations C and 9. Power is supplied at both ends.

In this way, according to the example system, even if a failure occurs in the optical submarine cable at any location, it is possible to switch the power supply path so that a both-end power supply path is formed using the remaining optical submarine cable. be.

In addition, when forming a power supply path using two or more underwater branching devices as in the above-mentioned embodiment, on the power supply path at both ends,
Two or more relays for different underwater branching devices will be inserted, but in such a case, to prevent hot switching of the relays, those relays will have their operating current (
The magnitude of the moving current) is set to be different from each other.

That is, when driving a relay of an underwater branching device, when the contact is switched to the ground side, if the potential to the ground of the contact is large, the relay contact may be damaged during switching due to the potential difference.

In order to prevent this damage, it is necessary to make sure that the ground potential of the power supply line of the underwater branch device becomes zero when driving the relay. For example, when supplying power between two landing stations at both ends of a main optical submarine cable that supplies power at both ends, the two landing stations set their respective power supply voltages by taking into account the voltage drop across the optical submarine cable. This method adjusts the voltage to an appropriate value so that the power supply potential becomes zero at the underwater branch device, but if there are two underwater branch devices as in the system shown in Figure 15, this method Undersea branching device BtJ1. BU2 cannot be brought to ground potential and zero at the same time.

Therefore, it is now assumed that a both-end power supply line is formed between landing stations A and 0, and the operating currents of relay RLI■ of underwater branch unit BU2 and relay RL2■ of underwater branch unit BU1, which are on the power supply at both ends, are set to different values. Set it. For example, the operating current of relay coil RL2■ is set to be smaller than the operating current of relay coil RLI■. To supply power between landing station A and landing station C, first adjust the power supply voltage of landing stations A and C so that the ground potential of the power supply path becomes zero at the underwater branch unit BUI, and then adjust the power supply current. As for relay coil R
A current having the magnitude of the operating current of L2■ is applied. As a result, relay RL2■ of underwater branching device B[Jl operates, but relay RLI■ of underwater branching device BU2 is activated.
Since the operating current is larger than that, it will not operate with the current power supply current. Therefore, although the ground potential of the power supply path of the underwater branch unit BU2 at this time is not zero, since the relay RLI■ is not operating, the switching contact rffl■ will not be damaged.

After operating the relay RL2■ of the underwater branch unit BUI in this way, the power supply potential of the landing station A and the landing station C is adjusted so that the ground potential of the power supply line of the underwater branch unit BU2 becomes zero. and the relay coil RLI as the power supply current.
■ Flow an operating current with the magnitude of . As a result, relay RLI■ of underwater branching device BU2 is operated. As described above, hot switching of the relays of the underwater branching devices BUI and BU2 can be prevented.

In this way, by varying the operating current of the relays of each underwater branching device that enters the power supply path at both ends, the number of underwater branching devices can be further increased and the power supply for an optical submarine cable communication system that communicates between an even larger number of landing stations can be achieved. It becomes possible to construct circuits.

In the above embodiments, mechanical contact relays such as vacuum relays were used as relays for underwater branching equipment, but the present invention is of course not limited to this, and non-contact relays such as solid state relays may also be used. It may be something you have. In this case, a semiconductor switch is used instead of a switching contact or a make/plate opening/closing contact.

[Effects of the Invention] As explained above, according to the present invention, even if a failure occurs in any submarine cable connected to an underwater branching device, a power supply path is formed between the remaining submarine cables and communication is restored. is possible, and the set feed path always includes a highly reliable both-end feed path. Furthermore, the power supply setting procedure is relatively simple and is comparable to the power supply switching procedure currently in practical use. Furthermore, if a self-holding circuit is added to the power supply route switching circuit, the already set power supply route will not change even if a fault occurs in the submarine cable during operation.

[Brief explanation of drawings]

Fig. 1 is a diagram explaining the principle of the present invention, Fig. 2 is a diagram showing a power supply line switching circuit of an underwater branching device as an embodiment of the present invention, and Fig. 3 is a power supply setting procedure of the device according to the embodiment of Fig. 2. 4 is an explanatory diagram of various power supply paths that can be set in the embodiment device shown in FIG. 2. FIG. 5 is a diagram showing a power supply route switching circuit of an underwater branching device as another embodiment of the present invention. , Fig. 6 is an explanatory diagram of the power supply setting procedure for the device of the embodiment shown in Fig. 5, Fig. 7 is a diagram illustrating the action of the self-holding relay added in the embodiment device of Fig. 5, and Fig. 8 is a diagram of the procedure shown in Fig. 5. FIG. 4 is an explanatory diagram of various power supply paths that can be set in the embodiment device. FIG. 9 is a diagram showing a power supply path switching circuit for an underwater branching device as still another embodiment of the present invention, and FIG. 10 is a diagram showing still another embodiment in which a power supply circuit for an optical fiber circuit is added to the device of the embodiment shown in FIG. Figure 11 is a diagram showing the overall configuration of an optical submarine cable communication system using the embodiment device shown in Figure 5. Figure 12 is a diagram showing an optical fiber circuit power supply circuit for the underwater branching device of the system shown in Figure 11. 13 is a diagram showing the overall configuration of an optical submarine cable communication system using the embodiment device of FIG. 9, and FIG.
Figure 15 is a diagram showing the overall configuration of an optical submarine cable communication system in which a power supply circuit for optical fiber circuits is added to the underwater branching device of the system. Fig. 16 is a diagram showing the overall configuration of an optical submarine cable communication system in which a power supply circuit for optical fiber circuits is added to the underwater branching device of the system in Fig. 15. Figure 18 is a diagram explaining the single-end power supply system, Figure 19 is a diagram explaining the double-end power supply system, and Figure 20 is the underwater branching device. 21 is a diagram illustrating various forms of optical fiber circuits of an underwater branching device, and FIGS. 22 to 24 are diagrams illustrating the schematic configuration of three or more landing stations, respectively. This is a conventional example of a power supply line switching circuit for an optical submarine cable communication system that performs the following steps. In the diagram, RLI to RL6...relay (or relay coil) rj
21 to rρ6...Relay contacts BU, BU1. BU2... Undersea branching device A, B, C,
D...-Landing station

Claims (1)

[Claims] 1, first, second, and third electric paths (101, 102, 10
3) in a Y-shape and each end has first, second, and third connection terminals (104
, 105, 106), the first relay (107) and its drive section (107L
) is arranged in the first electric path (101), and its switching part (
107C) that disconnects the second connection terminal (105) from the second electrical path (102) and grounds it, and a second relay (108) that connects the drive unit (108L).
) is arranged in the second electric path (102), and its switching part (
108C) separates the third connection terminal (106) from the third electrical path (103) and grounds it, and a third relay (109) connects the drive unit (109L) to the third connection terminal (106).
) is arranged in the third electric path (103), and its switching part (
109C) for disconnecting and grounding the first connection terminal (104) from the first electric path (101), and from the connection point of the Y-shaped electric path (101, 102, 103). The first, second and third relays (107, 108,
109) A power supply path switching circuit for an underwater branching device in which the directions of operating currents are the same. 2. The fourth relay (110) and its driving part (11
0L) in the second electrical path (102).
107), the first switch part (110C) forms a self-holding circuit, and the fifth relay (111) is a driving part thereof. (111L
) is the second relay (103) in the third electrical path (103).
8) The power supply for the underwater branching device according to claim 1, further comprising: a first switch section (111C) arranged in a ground path between the switching section (108L) and the ground, and the first switch section (111C) forming a self-holding circuit. road switching circuit. 3. The sixth relay (112) and its driving part (11
2L) is connected to the third relay (101) in the first electrical path (101).
3. The power supply line for an underwater branching device according to claim 2, further comprising: a first switch part (112C) disposed in a ground path between the switching part (109L) of the submersible switch part (109) and the ground, the first switch part (112C) forming a self-holding circuit. switching circuit. 4. The fourth relay (110) simultaneously connects its first switch section (110C) with the second electrical path between the drive section (108L) of the second relay (108) and the switching section of the relay (107). (107C) The second switch part (
110C), and the fifth relay (111C).
) simultaneously connects the third electrical path to the drive section of the third relay (109) and the relay (111C).
3. The power supply path switching circuit for an underwater branching device according to claim 2, further comprising a second switch section (111CC) that opens between the switching sections (108C) of the submersible branching device. 5. The sixth relay (112) simultaneously connects its first switch section (112C) with the first electric path between the drive section (107L) of the first relay (107) and the switching section of the relay (109). (109C) The second switch part (
4. The power supply path switching circuit for an underwater branching device according to claim 3, further comprising: 112CC). 6. In a power feeding method in a submarine cable communication system in which three or more landing stations are connected by branching a submarine cable using an underwater branching device, the power feeding device of each landing station is equipped with a feeding polarity switching mechanism, and the underwater branching device The power supply path switching circuit according to claim 1, 3, or 5 is used as the power supply path switching circuit, and the first, second, and third connection terminals (10
4, 105, and 106), and then one-sided power feeding is performed at the landing station connected to the remaining one connection terminal. A power supply method for a submarine cable communication system that forms a power supply path. 7. In a power feeding method in a submarine cable communication system in which a submarine cable is branched by an underwater branching device and three or more landing stations are connected, the power feeding device of each landing station is equipped with a feeding polarity switching mechanism, and the power feeding device of the underwater branching device is Claim 2 or 4 as a path switching circuit
The one described above is used, and the first and second connection terminals (104, 1
05) or between the landing stations connected to the first and third connection terminals (104, 106), and then connected to the remaining one connection terminal. A power feed path is formed by feeding power at one end at the landing station, and if a fault occurs in the power feed path between the landing stations that feeds power at both ends, connect terminals other than those connected to the faulty power feed path. A power supply method for a submarine cable communication system in which power is supplied at both ends between the landing stations connected to the remaining two connection terminals to form a power supply route while isolating a faulty power supply route. 8. Branch the submarine cable with two or more underwater branching devices 4.
In the above-described power feeding method in a submarine cable communication system connecting landing stations, the power feeding device of each landing station is provided with a feeding polarity switching mechanism, and the power feeding path switching circuit of the underwater branch device is used as a power feeding path switching circuit according to any one of claims 1 to 5. The one described is used, and the first connection terminal (10
4) The route connecting multiple power supply route switching circuits via the submarine cable connected to 4) was used as the main power supply route, and power was supplied at both ends between the two landing stations connected via this main power supply route. Later, a power supply method for a submarine cable communication system in which power is supplied from one end to another landing station to form a power supply path. 9. The power supply method for a submarine cable communication system according to claim 8, wherein the first relay and the second or third relay of the plurality of power supply path switching circuits are set to have different operating currents, and the main power supply A power supply method for a submarine cable communication system in which a first relay and a second or third relay of each power supply line switching circuit are sequentially driven by changing the power supply current flowing through the line. 10. In the power supply method for a submarine cable communication system according to claim 8, the power supply route switching circuit according to any one of claims 1 to 5 and a power supply route switching circuit having a circuit configuration other than that of the power supply route switching circuit are used as the power supply route switching circuit. A power supply method for a submarine cable communication system that forms a power supply path.