A reliable remote controlled branch unit

Abstract

A branch unit with reliable remote control belongs to the field of submarine communication network, and includes: a switching module, a power module 1, a power module 2, a control module, and three power supply terminals A, B, C, and SE. The switching module is composed of multiple relays, which are used to switch the power supply path; the power module 1 and the power module 2 are backed up for each other, and output the working power of the control module; the control module can receive shore-based commands and drive the relay to switch. When a fault is transmitted at the cable end, the power module 1 and / or the power module 2 are selected by the switching module to continuously supply power to the control module, thereby ensuring the stability and reliability of the control module and achieving the purpose of reliable remote control of the branch unit.

Description

Technical Field

[0001] The present invention is mainly applied to the field of submarine communication networks, and in particular relates to a branch unit with reliable remote control. Background Art

[0002] The submarine fiber optic communication system may include a trunk path extending between land-based cable stations and one or more branch segments connected to other areas. The trunk is constant by a submarine cable having a plurality of optical fibers therein and one or more repeaters or optical amplifiers arranged along the trunk path for amplifying the optical signals transmitted between the cable stations. Each cable station includes a terminal device for transmitting and receiving these optical signals along the trunk path. One or more branch segments are coupled to the trunk at one end through a branch unit 2 and to a branch segment cable station at the other end. These systems are called trunk and branch networks. The trunk cable station can be used to carry information signals through the network backbone and the branch segment can be used to transmit the business between the trunk path to the branch cable station or receive the business between the trunk path. The optical signal transmitted between the trunk and the branch cable station is typically a dense wavelength division multiplexing (DWDM) signal, in which multiple optical channels (each at a corresponding wavelength) are multiplexed together.

[0003] In the submarine cable system, in order to cope with the gridding of the network and suppress the construction cost, a network consisting of a plurality of submarine branch devices installed on the seabed and a plurality of land stations is constructed. The submarine repeaters and submarine branch devices used in such submarine cable systems are usually operated by power supply from a power supply device installed in a land station.

[0004] However, the traditional branch unit can only support the power supply path switching when the cable end is fault-free. When the cable end fails, the branch unit cannot receive shore-based instructions and switch the power supply path according to the instructions. Therefore, it is very important to design a branch unit that can be remotely controlled by the shore when any cable end fails. Summary of the invention

[0005] In view of the above-mentioned defects of the cable-based submarine communication network, the present invention proposes a reliable remote-controlled branch unit, which can ensure that when any cable end fails, the shore-based instructions can be smoothly sent to the branch unit, thereby switching the power supply path.

[0006] The technical solution of the present invention is:

[0007] A reliable remote-controlled branch unit, characterized by an internal circuit of the branch unit, the circuit scheme includes: a switching module, a power module 1, a power module 2, a control module and three power supply terminals A, B, C and SE.

[0008] In the above scheme, the switching module is composed of multiple relays for switching the power supply path; power module 1 and power module 2 are backed up for each other and output the working power of the control module; the control module can receive shore-based commands and drive the relay to switch. When a fault occurs at the cable end, the switching module selects power module 1 and / or power module 2 to continuously supply power to the control module, and the power module stabilizes the high voltage delivered by the power supply end into a low voltage for the control module to work.

[0009] Preferably, the control module includes a photoelectric conversion circuit that receives optical commands sent from the shore base and converts them into electrical signals, a drive circuit that parses the electrical signals into operating levels for the drive circuit, and a command-type relay switch that sends state switching.

[0010] Preferably, the switching module switches the power supply path by connecting 9 relays; there are 4 command-type relay switches, namely S1, S2, S3, and S4, and 5 current-type relay switches, namely S5, S6, S7, S8, and S9, and S5, S6, S7, and S8 are respectively provided with two groups of contacts. In the relay, in the same group of contacts, the connection of the contact to the common terminal indicates that the relay is connected, and the disconnection of the contact to the common terminal indicates that the relay is disconnected.

[0011] For the A end, the coil of S7, S1 and the first set of contacts of S8 are connected between the A end and the power module 1, specifically:

[0012] The coil of S7, the disconnect contact of S1, and the disconnect contact of S8 are connected in series between the A terminal and the power module one.

[0013] For the B end, the coil of S6, the coil of S9 and S2 are connected between the B end and the power module 1. Specifically:

[0014] The coil of S6, the coil of S9 and the disconnecting contact of S2 are connected in series between the B terminal and the power module 1.

[0015] For the C terminal, the coil of S8, the two sets of contacts of S5, the two sets of contacts of S6, the first set of contacts of S7 and S3 are connected between the C terminal and the power module 1 and the power module 2. Specifically:

[0016] The disconnection contact of S3, the disconnection contact 1 of S6, the disconnection contact 1 of S5, and the coil of S8 are connected in series and then connected to the power module 1; the disconnection contact of S3, the disconnection contact 1 of S7, the disconnection contact 1 of S5, and the coil of S8 are connected in series and then connected to the power module 1;

[0017] The disconnect contact of S3, the disconnect contact 1 of S6 / S7, and the make contact 1 of S5 are connected in series and connected to the power module 2; the disconnect contact of S3, the make contact 1 of S7, and the make contact 2 of S6 are connected in series and connected to the power module 2; the disconnect contact of S3 and the make contact 2 of S5 are connected in series and connected to the power module 2.

[0018] For the SE end, the coil of S5, the second group of contacts of S7, the second group of contacts of S8, S9 and S4 are connected between the power module 1, the power module 2 and the SE end. Specifically:

[0019] Power module 2, coil of S5 and SE terminal are connected in series;

[0020] The disconnection contact 2 of S7, the disconnection contact 2 of S8, and the connection contact of S4 are connected in series between the power module 1 and the SE end; the disconnection contact of S9, the disconnection contact 2 of S8, and the connection contact of S4 are connected in series between the power module 1 and the SE end;

[0021] The make contact 1 of S8 is connected in series with the A terminal and the SE terminal; the break contact 1 of S8 and the make contact 1 of S1 are connected in series with the A terminal and the SE terminal; the make contact 1 of S2 is connected in series with the B terminal and the SE terminal; the make contact 1 of S3 is connected in series with the C terminal and the SE terminal.

[0022] When a fault occurs at either cable end, the switched power supply path can continue to supply power to the control module, and shore-based instructions can be delivered to the inside of the branch unit; when a fault occurs at any two cable ends, the switched power supply path can continue to supply power to the control module, and shore-based instructions can be delivered to the inside of the branch unit.

[0023] The present invention utilizes 9 relays to form a new switching module and adds a power supply module inside the branch unit. When the original power supply path fails, the current-type relay switch in the switching module automatically switches. The two power supply modules are redundant with each other, ensuring that the control module is always in working condition before and after the shore-side command is issued.

[0024] Compared with the prior art, the advantages of the present invention are: a reliable remote-controlled branch unit of the present invention can ensure that the power supply path is switched when a power supply path fails, and the shore-side instructions can be smoothly sent to the inside of the branch unit.

[0025] The present invention uses a bistable relay to control the switching of the power supply path. When the branch unit is disturbed by current fluctuations, the contacts of the relay will not cause unnecessary switching, laying the foundation for the stability and reliability of the branch unit; when a failure occurs at the power supply end, the power supply module can continue to supply power to the control module, so that the control module continues to receive the optical signal transmitted from the power supply end, further ensuring the stability and reliability of the control module and achieving the purpose of reliable remote control of the branch unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly describe the technical solution of the present invention, refer to the attached Figure 1 To Figure 6 for explanation:

[0027] Figure 1 This is a schematic diagram of the structure of a branch unit with reliable remote control in Example 1;

[0028] Figure 2 This is a schematic diagram of an initial state of a branch unit with reliable remote control in Example 1;

[0029] 3 (a) and (b) are schematic diagrams of single-end circuit breaker fault switching of a branch unit with reliable remote control in Example 2;

[0030] 4 (a) and (b) are schematic diagrams of single-ended short-circuit fault switching of a branch unit with reliable remote control in Example 3;

[0031] 5 (a) and (b) are schematic diagrams of double-end fault switching of a branch unit with reliable remote control in Example 4;

[0032] 6 (a) and (b) are schematic diagrams of double-end circuit breaker fault switching of a branch unit with reliable remote control in Example 5;

[0033] In the figure: branch unit 1, control module 2, power module 3, switching module 4, power supply terminal 5, ground terminal 6; control module 201, power module one 301, power module two 302, switching module 401, power supply terminal 501, ground terminal 601. DETAILED DESCRIPTION

[0034] In order to describe the present invention more specifically, the technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods;

[0035] Example 1

[0036] Figure 1 1 is a schematic diagram of a reliable remote-controlled branch unit provided by an embodiment of the present invention. The system provided by this embodiment includes: a branch unit 1, a power supply terminal 5 and a ground terminal 6. The branch unit 1 is a device installed on the seabed to connect the submarine cable. The branch unit 1 includes an input port 7, a switching module 4, a power module 3 (power module 1 301, power module 2 302) and a control module 2.

[0037] Figure 2 It is a schematic diagram of the initial power supply path of the branch unit 1. The current in the power module 1 301 flows from branch A to branch B, and the current in the power module 2 302 flows from the SE terminal 601 to branch C.

[0038] The figure details the internal connection diagram of each relay. Each relay is a relay with transfer contacts. The common terminal is represented by the white dot below. The state where the black dot above (disconnected contact) is connected to the common terminal is the relay disconnected, and the state where the white dot above (connected contact) is connected to the common terminal is the relay connected. S5 to S9 are current-type relay switches controlled by coils L5 to L9. When power is not fed to the coil of the corresponding relay, the switch will be disconnected. S1 to S4 are command-type relay switches controlled by the control module 201 (receiving shore-based commands). When power is not fed to the control module 201, the switch will be disconnected.

[0039] Figure 2 In the example, command relay switches S1, S2, and S3 remain in the off state, and S4 is in the on state; current relay switches S5, S6, S7, and S9 become on states, and S8 remains off state. S5, S6, S7, and S8 are respectively provided with two sets of on contacts, off contacts, and common terminals.

[0040] For end A:

[0041] The coil of S7, the disconnect contact of S1, and the disconnect contact of S8 are connected in series between the A terminal and the power module one.

[0042] For the B side:

[0043] The coil of S6, the coil of S9 and the disconnecting contact of S2 are connected in series between the B terminal and the power module 1.

[0044] For the C-end:

[0045] The disconnection contact of S3, the disconnection contact 1 of S6, the disconnection contact 1 of S5, and the coil of S8 are connected in series and then connected to the power module 1; the disconnection contact of S3, the disconnection contact 1 of S7, the disconnection contact 1 of S5, and the coil of S8 are connected in series and then connected to the power module 1;

[0046] The disconnect contact of S3, the disconnect contact 1 of S6 / S7, and the make contact 1 of S5 are connected in series and connected to the power module 2; the disconnect contact of S3, the make contact 1 of S7, and the make contact 2 of S6 are connected in series and connected to the power module 2; the disconnect contact of S3 and the make contact 2 of S5 are connected in series and connected to the power module 2.

[0047] For SE side:

[0048] Power module 2, coil of S5 and SE terminal are connected in series;

[0049] The disconnection contact 2 of S7, the disconnection contact 2 of S8, and the connection contact of S4 are connected in series between the power module 1 and the SE end; the disconnection contact of S9, the disconnection contact 2 of S8, and the connection contact of S4 are connected in series between the power module 1 and the SE end;

[0050] The make contact 1 of S8 is connected in series with the A terminal and the SE terminal; the break contact 1 of S8 and the make contact 1 of S1 are connected in series with the A terminal and the SE terminal; the make contact 1 of S2 is connected in series with the B terminal and the SE terminal; the make contact 1 of S3 is connected in series with the C terminal and the SE terminal.

[0051] Figure 2 Middle: A terminal → S8 disconnect contact 1 → S1 disconnect contact → S7 coil L7 → power module 1 301 → S6 coil L6 → S9 coil L9 → S2 disconnect contact → B terminal, forming a power supply circuit of power module 1 301 to supply power to the control module;

[0052] SE end 601→S5 coil L5→power module 2→S5 connected contact 2→S3 disconnected contact→C end, or, SE end 601→S5 coil L5→power module 2→S6 connected contact 2→S7 connected contact 1→S3 disconnected contact→C end, forming a power supply circuit of power module 2 to power the control module.

[0053] Example 2

[0054] Based on Example 1, FIG. 3 (a) and (b) are switching state diagrams describing an open circuit fault in branch A, and "X" indicates that the power supply path is open due to an open circuit fault in branch A. When an open circuit fault occurs in branch A, the current in coil L7 is cut off and switch S7 is disconnected. Branch B and ground terminal 5 form the input terminal of power module 1 301, and branch C and ground terminal 5 form the input terminal of power module 2 302. The two power supplies provide working power for control module 201.

[0055] In FIG3 (a), SE terminal 601 → S4 connected contact → S8 disconnected contact 2 → S7 disconnected contact 2 → power module 1 301 → S6 coil → S9 coil → S2 disconnected contact → B terminal, forming a power supply circuit of power module 1;

[0056] SE end 601→S5 coil→power module 2 302→S5 connection contact 2→S3 disconnect contact→C end, forming a power supply circuit for power module 2.

[0057] In FIG3 (b), the control module 201 turns on the switch S1 based on any command (shore-based instruction) in the power supply terminal 501, that is, the branch A is physically connected to the ground terminal 601. When working at the fault position of branch A, it can avoid applying an unexpected high voltage from the power supply path to the fault position of branch A, thereby improving the safety of work. Through shore-based operation, the power supply of branch C is disconnected, the current in coil L5 is cut off, and the switch S5 is disconnected; after changing the power supply polarity of branch C, the power supply of branch C is started, the input current flows into coil L8, and the switch S8 is turned on, forming the feeding path of branch C, branch unit 1, and branch B (that is, C terminal → S3 disconnected contact → S7 disconnected contact 1 → S5 disconnected contact 1 → S8 coil → power module 1 301 → S6 coil → S9 coil → S2 disconnected contact → B terminal, forming the power supply circuit of power module 1).

[0058] Example 3

[0059] Based on Example 1, Figures 4 (a) and (b) are switching state diagrams describing a ground fault occurring in branch A, where "X" indicates that the power supply path is changed due to a short circuit fault, forming the feed path of the SE end, branch unit 1, and branch C / B.

[0060] In FIG4 (a), SE terminal 601→S8 disconnect contact 1→S1 disconnect contact→S7 coil L7→power module 1 301→S6 coil L6→S9 coil L9→S2 disconnect contact→B terminal, forming a power supply circuit of power module 1 301;

[0061] SE end 601→S5 coil→power module two 302→S5 connected contact two→S3 disconnected contact→C end, or, SE end 601→S5 coil→power module two 302→S6 connected contact two→S7 connected contact one→S3 disconnected contact→C end, forming a power supply circuit for power module two.

[0062] In Figure 4 (b), the control module 201 turns on the switch S1 based on any command in the power supply terminal 501, that is, the branch A is physically connected to the ground terminal 601. When working at the fault position of branch A, it is possible to avoid applying an unexpected high voltage from the power supply path to the fault position of branch A, thereby improving the safety of the work. The current in coil L7 is cut off and the switch S7 is disconnected. Through shore-based operation, the power supply of branch C is disconnected, the current in coil L5 is cut off, and the switch S5 is disconnected; after changing the power supply polarity of branch C, the power supply of branch C is started, the input current flows into coil L8, and the switch S8 is turned on, forming the feeding path of branch C, branch unit 1, and branch B, and connecting the faulty part of branch A to the SE terminal 601 (that is: C terminal → S3 disconnect contact → S7 disconnect contact one → S5 disconnect contact one → S8 coil → power module one 301 → S6 coil → S9 coil → S2 disconnect contact → B terminal, forming a power supply circuit for power module one).

[0063] Example 4

[0064] Based on Example 1, Figures 5 (a) and (b) are state diagrams describing the switching of the power supply path when the power supply from branch A and branch B is interrupted. "X" indicates that the power supply path is changed due to a short circuit or open circuit fault at the branch end, forming the feeding path of the SE end, branch unit 1, and branch C.

[0065] In FIG5(a), SE terminal 601→S4 connected contact→S8 disconnected contact 2→S7 disconnected contact 2 / S9 disconnected contact→power module 1 301→S8 coil→S5 disconnected contact 1→S6 / S7 disconnected contact 1→S3 disconnected contact→C terminal, forming a power supply circuit of power module 1.

[0066] In FIG5(b), the control module 201 turns on switches S1 and S2 based on any command in the power supply terminal 501. Branch A and branch B are physically connected to the ground terminal 601 and disconnected from the feeding part. As in FIG5(a), the feeding path of the SE terminal, branch unit 1, and branch C is formed.

[0067] Example 5

[0068] Figure 6 (a) and (b) are state diagrams describing the switching of the power supply path when the power supply from branch A and branch C is interrupted. "X" indicates that the power supply path is changed due to an open circuit fault at the branch end, forming the feeding path of the SE end, branch unit 1, and branch B.

[0069] In FIG6 (a), SE terminal 601→S4 connected contact→S8 disconnected contact 2→S7 disconnected contact 2→power module 1 301→S6 coil→S9 coil→S2 disconnected contact→B terminal, forming a power supply circuit of power module 1.

[0070] In FIG6(b), the control module 201 turns on switches S1 and S3 based on any command in the power supply terminal 501. Branch A and branch C are physically connected to the ground terminal 601 and disconnected from the feeding part. As in FIG6(a), the feeding path of the SE terminal, branch unit 1, and branch B is formed.

[0071] For other power supply failure scenarios, refer to the following:

[0072] The operation when the B end is open circuit fault can refer to implementation case 2, and finally form the feeding path of branch A, branch unit 1, and branch C; the operation when the B end is grounded can refer to implementation case 3, and finally form the feeding path of branch A, branch unit 1, and branch C;

[0073] The operation when the C end is open circuit fault can refer to implementation case 2, and finally form the feeding path of branch A, branch unit 1, and branch B; the operation when the C end is grounded can refer to implementation case 3, and finally form the feeding path of branch A, branch unit 1, and branch B;

[0074] The operation when the BC end has an open circuit fault can refer to Implementation Case 5, and finally the feeding path of branch A, branch unit 1, and SE end is formed. The above-mentioned specific implementation methods have described the technical scheme and beneficial effects of the present invention in detail. It should be understood that the above description is only the most preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, supplements and equivalent substitutions made within the scope of the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reliable remote controlled branch unit, characterized in that: It includes power module 1, power module 2, control module, switching module, grounding terminal SE terminal, and three power supply terminals A terminal, B terminal, and C terminal; Power module 1 and power module 2 back up each other and output the working power of the control module; the switching module includes 4 command-type relay switches S1, S2, S3, S4, and 5 current-type relay switches S5, S6, S7, S8, S9; the control module receives shore-based commands and drives the relay to switch the power supply path; For end A: The coil of S7, the disconnect contact of S1, and the disconnect contact of S8 are connected in series between the A terminal and the power module 1; For the B side: The coil of S6, the coil of S9, and the disconnection contact of S2 are connected in series between the B terminal and the power module 1; For the C-end: The disconnection contact of S3, the disconnection contact 1 of S6, the disconnection contact 1 of S5, and the coil of S8 are connected in series and then connected to the power module 1; the disconnection contact of S3, the disconnection contact 1 of S7, the disconnection contact 1 of S5, and the coil of S8 are connected in series and then connected to the power module 1; The disconnection contact of S3, the disconnection contact 1 of S6 / S7, and the connection contact 1 of S5 are connected in series and then connected to the power module 2; the disconnection contact of S3, the connection contact 1 of S7, and the connection contact 2 of S6 are connected in series and then connected to the power module 2; the disconnection contact of S3 and the connection contact 2 of S5 are connected in series and then connected to the power module 2; For SE side: The power module 2, the coil of S5, and the SE end are connected in series; the disconnection contact 2 of S7, the disconnection contact 2 of S8, and the connection contact of S4 are connected in series between the power module 1 and the SE end; the disconnection contact of S9, the disconnection contact 2 of S8, and the connection contact of S4 are connected in series between the power module 1 and the SE end; the connection contact 1 of S8 is connected in series between the A end and the SE end; the disconnection contact 1 of S8 and the connection contact of S1 are connected in series between the A end and the SE end; the connection contact of S2 is connected in series between the B end and the SE end; the connection contact of S3 is connected in series between the C end and the SE end; When a fault occurs at the cable end, the power module 1 and / or the power module 2 is selected through the switching module to continuously supply power to the control module.

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