Optical fiber splicing device and construction method suitable for optical fiber bearing cables embedded in intelligent contact network

Abstract

The present invention relates to an optical fiber splicing device suitable for an optical fiber load-bearing cable embedded in an intelligent contact network. The contact network divides its contact suspension part into several anchor sections. The contact wires and optical fibers in the load-bearing cables of different anchor sections are connected in sequence. An optical fiber splicing unit is provided between each two adjacent anchor sections for optical fiber connection. The optical fiber splicing unit includes an optical fiber telescopic device which is respectively provided at one end of the contact wire and the load-bearing cable and strips the optical fiber. The other end of each optical fiber telescopic device is led down to the ground through a contact network pole. The optical fibers at both ends of the contact wire and the load-bearing cable in the same anchor section joint all pass underground and are connected on the contact network pole through an optical fiber splicing box. The method has the advantages of saving investment, improving labor efficiency, and strong engineering feasibility. The optical fiber splicing device has the advantages of flexible deployment and accurate monitoring. The monitoring system configured by the device has a long monitoring distance and fine management.

Description

Technical Field

[0001] The invention belongs to the field of railway contact network monitoring, and particularly relates to an optical fiber splicing device suitable for an optical fiber load-bearing cable embedded in an intelligent contact network and a construction method thereof. Background Art

[0002] With the development of China's high-speed railway technology, the operation safety of high-speed trains has put forward higher requirements for the monitoring technology of the railway overhead line system. In order to achieve real-time, efficient and accurate performance of overhead line monitoring technology, we need to not only continuously improve the existing monitoring methods, but also develop new overhead line monitoring technologies.

[0003] Traditional contact network maintenance is time-consuming and labor-intensive. The proposed intelligent contact network is of great significance to improving operation and maintenance efficiency and reducing the occurrence rate of failures. During monitoring, the distributed optical fiber sensing monitoring equipment of the intelligent contact network continuously injects pulse light into the optical fiber. Due to the inhomogeneity of the optical fiber itself, it will continuously generate backscattered light while transmitting in the optical fiber. The transmission speed of the light wave in the optical fiber and the time difference between the incident light and the reflected light can locate the information measured along the optical fiber. Distributed optical fiber sensing technology uses a tens of kilometers long optical fiber as a sensing element and a signal transmission element. Over the entire length of the optical fiber, the environmental physical parameters distributed along the optical fiber geometric path are continuously and in real time measured. Distributed optical fiber sensing technology can realize functions such as object recognition and information collection, and provide big data support for the refined management of the contact network. Although there is already optical fiber splicing technology for monitoring in the power field, there is no optical fiber splicing for railway contact networks. The existing optical fiber splicing devices cannot meet the use requirements of railway contact networks. Summary of the invention

[0004] In view of the above technical problems, the present invention proposes an optical fiber splicing device suitable for embedded optical fiber optic lines in intelligent contact networks, which can monitor contact network information at any time.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is a fiber optic splicing device suitable for embedded fiber optic bearing cables in an intelligent contact network, wherein the contact network divides its contact suspension part into a plurality of anchor sections, and the contact wires and optical fibers in the bearing cables of different anchor sections are connected in sequence, and a fiber optic splicing unit is provided between every two adjacent anchor sections for fiber optic connection; the fiber optic splicing unit comprises a fiber optic telescopic device which is respectively arranged at one end of the contact wire and the bearing cable and strips out the optical fiber, and the other end of the contact wire and the bearing cable of each of the fiber optic telescopic devices is led down to the ground through a contact network pole, and the optical fibers at both ends of the contact wire and the bearing cable in the same anchor section joint all pass through underground and are connected through a fiber optic splicing box on the contact network pole.

[0006] Furthermore, the optical fiber connection of the optical fiber splicing box between every two adjacent anchor sections forms an optical fiber splicing device in the entire contact network, and the optical fiber splicing device is connected to the communication optical cable equipment, which includes a substation, a converter station and a communication room.

[0007] In an improved technical solution, the specific structure of the optical fiber splicing device connected to the communication optical cable equipment is: the load-bearing cable is connected to the terminal joint box, and then led along the pole tower of the contact network pole through a non-metallic optical cable to the optical fiber splicing box installed on the contact network pole.

[0008] Furthermore, the optical fiber splicing box is deployed in a safe area on the pole tower, the non-metallic optical cable is fused with the communication optical cable ADSS in the optical fiber splicing box, the other end of the communication optical cable ADSS is led along the inside of the pole tower to the bottom and then extends out of the pole tower, and the extended end of the communication optical cable ADSS is laid into the nearest communication pipeline to the communication optical cable equipment.

[0009] Furthermore, an armored protective layer is provided on the outer surface of the communication optical cable ADSS.

[0010] On the other hand, the present invention also discloses an intelligent sensing system for a contact network, comprising a return line containing optical fibers, a load-bearing cable, a contact line and a lightning conductor, the load-bearing cable and the contact line both comprising the above-mentioned optical fiber connection device, the system further comprising a lightning strike monitoring module, an icing monitoring module and a vibration monitoring module; the lightning strike monitoring module comprises a distributed lightning strike monitoring host and a distributed lightning strike monitoring slave respectively arranged at both ends of the lightning conductor and connected to the internal optical fibers thereof; one end of the internal optical fibers of the return line and the load-bearing cable are connected to an optical multiplexing module, the optical multiplexing module being connected to a distributed icing monitoring device and a distributed vibration analysis multiplexing device.

[0011] Furthermore, the lightning monitoring module, ice monitoring module and vibration monitoring module are all installed in the traction substation or AT station at one or both ends of the catenary cables and lightning conductors of the railway contact network.

[0012] In a third aspect, the present invention further proposes a construction method for an optical fiber splicing device for an intelligent contact network, the method comprising:

[0013] At each anchor section of the contact network, the end close to the contact network and the load-bearing cable is stripped of optical fiber through the terminal joint box and connected to the optical fiber expansion device;

[0014] The other end of the optical fiber telescopic device is led down to the ground through the contact network pole, and the two optical fibers in the same anchor section joint pass through the underground and are connected through the optical fiber splicing box on the contact network pole;

[0015] By analogy, the optical fibers between every two adjacent anchor sections are connected through the optical fiber splicing box, thereby completely connecting the optical fibers in the entire contact network together, and finally, the connected optical fibers are connected to the communication optical cable equipment.

[0016] Furthermore, the method for connecting the optical fiber splicing device to the communication optical cable equipment comprises the following steps:

[0017] After the load-bearing cable is separated from the optical fiber by the terminal joint box, the optical signal is led to the optical fiber joint box along the tower through the non-metallic optical cable;

[0018] The optical fiber splicing box is deployed in a safe area on the tower. The non-metallic optical cable is fused with the communication optical cable ADSS through the optical fiber splicing box to transmit the real-time collected optical signal to the equipment end.

[0019] After leaving the pole tower, the communication optical cable ADSS is laid into the nearest communication pipeline to the substation, converter station or communication room; wherein the communication optical cable ADSS has an armored protective layer.

[0020] Furthermore, the method also includes

[0021] Before laying the cables, check the occupancy of the pipelines, clean and place the plastic casing, and insert the traction line. The laying length should not exceed 2km at a time, and the laying traction force should generally not exceed 120kg. The cable head should also be waterproofed and reinforced.

[0022] The present invention is applicable to an optical fiber splicing device of an embedded optical fiber load-bearing cable in an intelligent contact network, and connects the optical fibers in the contact network and load-bearing cables of different anchor sections to an optical fiber splicing box after passing through an optical fiber telescopic device, and then sequentially connects adjacent anchor sections, and finally aggregates the information into a traction transformer or an AT station; segmented monitoring and maintenance along the optical fiber path are implemented step by step through the optical fiber splicing unit of multiple anchor sections, so that continuous and real-time monitoring of the contact network is realized, and at the same time, it has the advantages of flexible deployment, precise monitoring management, and long monitoring distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of the anchor section joint of the optical fiber splicing device suitable for the optical fiber thread embedded in the intelligent contact network;

[0025] Figure 2It is a schematic diagram of the overall structure of an optical fiber splicing device suitable for optical fiber optic cables embedded in intelligent overhead contact network;

[0026] Figure 3 A schematic diagram of the deployment structure of the catenary cable connected to the communication optical cable;

[0027] Figure 4 It is a schematic diagram of the structure of the contact network;

[0028] Figure 5 This is the overall structure diagram of the overhead line sensing system;

[0029] Figure 6 Schematic diagram of the module connection structure of the contact network intelligent sensing system. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and beneficial effects of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] The following describes an embodiment of the optical fiber splicing device applicable to the optical fiber thread embedded in the intelligent contact network with reference to the accompanying drawings.

[0032] like Figure 1 The optical fiber splicing device shown is suitable for embedded optical fiber lines in an intelligent contact network, wherein the contact network divides its contact suspension part into a plurality of anchor sections, and the optical fibers in the contact wire 1 and the load-bearing cable 2 of different anchor sections are connected in sequence, and an optical fiber splicing unit is provided between each two adjacent anchor sections for optical fiber connection; the optical fiber splicing unit comprises an optical fiber telescopic device 10 which is respectively provided at one end of the contact wire 1 and the load-bearing cable 2 and strips off the optical fiber, and the other end of the contact wire 1 and the load-bearing cable 2 of each optical fiber telescopic device 10 is led down to the ground through the contact network pole 3, and the optical fibers at both ends of the contact wire 1 and the optical fibers at both ends of the load-bearing cable 2 in the same anchor section joint all pass underground and are connected through an optical fiber splicing box 11 on the contact network pole 3.

[0033] It should be noted that the intelligent contact network embedded optical fiber wire means that the traditional return line, load-bearing cable and lightning conductor are replaced with intelligent return line, intelligent load-bearing cable and intelligent lightning conductor containing optical fiber units, and the internal optical fiber of the intelligent return line and intelligent load-bearing cable of the contact network is used as a sensor to collect the basic optical parameters in the optical fiber of the contact network and transmit them to the substation through the optical fiber, thereby realizing the monitoring of the operating status of the contact network.

[0034] The optical fiber splicing device in the above embodiment includes the fiber output mode of the contact wire and the load-bearing cable and the splicing mode between the anchor sections. Figure 2As shown, both ends of each anchor section of the contact network are installed with optical fiber expansion and contraction devices for tension compensation to prevent the optical fiber from being damaged due to thermal expansion and contraction, driving, etc. when the contact line and the optical fiber in the load-bearing cable need to contact with the adjacent anchor section and connect with the optical fiber in the load-bearing cable first. The present invention connects the optical fiber stripped from one end close to the contact line and the load-bearing cable through the terminal junction box to the optical fiber expansion and contraction device, and offsets the expansion and contraction demand of the optical fiber through the automatic expansion and contraction characteristics of the optical fiber expansion and contraction device. On the other hand, the connection method of the contact network and the load-bearing cable between the anchor sections is to connect through an optical fiber splicing box. Taking an anchor section joint as an example, the other end of the optical fiber expansion and contraction device is led down to the ground through the contact network pole. In order to ensure that it does not affect driving and for safety considerations, the two optical fibers in the same anchor section joint pass through the underground and are connected on the contact network pole through an optical fiber splicing box. The optical fiber splicing box 11 is fixed to the contact network pole 3 through a tripod 12. As shown Figure 2 As shown, by analogy, the optical fibers between the anchor sections are connected through the optical fiber splicing box between each two adjacent anchor sections, and then the optical fibers in the entire contact network are completely connected together, and finally, the connected optical fibers are connected to the communication optical cable equipment to monitor the information of the contact network at any time. The communication optical cable equipment includes a substation, a converter station and a communication room.

[0035] The example of the present invention also provides a deployment structure of a smart catenary cable connected to a communication optical cable. Figure 3 As shown, the specific structure of the optical fiber splicing device connected to the communication optical cable equipment is: the bearing cable 2 is connected to the terminal joint box 4, and then is led along the pole tower of the contact network pole 3 to the optical fiber splicing box 11 arranged on the contact network pole 13 through the non-metallic optical cable 40.

[0036] The optical fiber splicing box 11 is deployed in a safe area on the pole tower, the non-metallic optical cable 40 is fused with the communication optical cable ADSS41 in the optical fiber splicing box 11, the other end of the communication optical cable ADSS41 is led along the inside of the pole tower to the bottom and then extends out of the pole tower, and the extended end of the communication optical cable ADSS41 is laid into the nearest communication pipeline 42 to the communication optical cable equipment. The outer surface of the communication optical cable ADSS41 is provided with an armored protective layer, which makes the optical cable have a certain tensile resistance and facilitates the laying of the optical cable in the communication pipeline.

[0037] Corresponding to the above optical fiber splicing device, the present invention also discloses an optical fiber splicing construction method applicable to an optical fiber thread embedded in an intelligent contact network of the corresponding device, the method comprising:

[0038] At each anchor section of the contact network, the end close to the contact network and the load-bearing cable is stripped of optical fiber through the terminal joint box and connected to the optical fiber expansion device;

[0039] The other end of the optical fiber telescopic device is led down to the ground through the contact network pole, and the two optical fibers in the same anchor section joint pass through the underground and are connected through the optical fiber splicing box on the contact network pole;

[0040] By analogy, the optical fibers between every two adjacent anchor sections are connected through the optical fiber splicing box, thereby completely connecting the optical fibers in the entire contact network together, and finally, the connected optical fibers are connected to the communication optical cable equipment.

[0041] The method for connecting the optical fiber splicing device to the communication optical cable equipment comprises the following steps:

[0042] After the load-bearing cable is separated from the optical fiber by the terminal joint box, the optical signal is led to the optical fiber joint box along the tower through the non-metallic optical cable;

[0043] From the perspective of construction safety, the fiber optic splicing box is deployed in a safe area on the tower (the middle or upper part of the tower); from the perspective of transmission safety, the non-metallic optical cable is fused with the communication optical cable ADSS through the fiber optic splicing box to transmit the real-time collected optical signal to the equipment end;

[0044] After leaving the pole tower, the communication optical cable ADSS is laid into the nearest communication pipeline to the substation, converter station or communication room; wherein, the communication optical cable ADSS has an armored protective layer, which makes the optical cable have a certain tensile resistance and facilitates the laying of the optical cable in the communication pipeline.

[0045] Before the above-mentioned laying construction, check the pipeline occupancy situation, clean and install the plastic casing, and put in the traction line at the same time. The laying length at one time should not exceed 2km, the laying traction force is generally not more than 120kg, and the waterproof reinforcement treatment of the optical cable head should be done.

[0046] In another aspect, the present invention provides an overhead line intelligent sensing system using the above optical fiber splicing device, such as Figure 4 As shown, it includes a return line 6 containing optical fiber, a load-bearing cable 2, a contact line 1 and a lightning conductor 5 installed on a contact network pole. The intelligent lines with embedded optical fiber (i.e., the flow line 6, the load-bearing cable 2, the contact line 1 and the lightning conductor 5) can all include the above-mentioned optical fiber splicing device. Figure 6 As shown, the system also includes a lightning monitoring module, an icing monitoring module and a vibration monitoring module; the lightning monitoring module 50 includes a distributed lightning monitoring host 51 and a distributed lightning monitoring slave 52, which are respectively arranged at both ends of the lightning protection line 5 and connected to the internal optical fiber thereof; the return line 6 and one end of the internal optical fiber of the supporting cable 2 are connected to an optical multiplexing module 63, and the optical multiplexing module 63 is connected to a distributed icing monitoring device 64 and a distributed vibration analysis multiplexing device 65.

[0047] like Figure 5As shown, the lightning monitoring module, ice monitoring module and vibration monitoring module are all installed in the traction substation or AT station at the single or double ends of the load-bearing cable 2 and the lightning conductor 5 of the railway contact network. By collecting the basic optical parameters in the optical fiber, the relationship between the optical parameters and the state quantities of the intelligent return line, intelligent load-bearing cable and intelligent lightning conductor is established to realize the monitoring of the contact network operation status.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An optical fiber splicing device suitable for an optical fiber-embedded catenary in an intelligent contact network, wherein the contact network is divided into a plurality of anchor sections for its contact suspension part, characterized in that: The optical fibers in the contact wires (1) and the load-bearing cables (2) of different anchor sections are connected in sequence, and an optical fiber splicing unit is provided between each two adjacent anchor sections for optical fiber connection; the optical fiber splicing unit comprises an optical fiber telescopic device (10) which is respectively provided at one end of the contact wire (1) and the load-bearing cable (2) and strips off the optical fiber; the other end of the contact wire (1) and the load-bearing cable (2) of each optical fiber telescopic device (10) is led down to the ground through a contact network pole (3); the optical fibers at both ends of the contact wire (1) and the optical fibers at both ends of the load-bearing cable (2) in the same anchor section joint all pass underground and are connected on the contact network pole (3) through an optical fiber splicing box (11); The optical fiber connection of the optical fiber splicing box (11) between each two adjacent anchor sections forms an optical fiber splicing device in the entire contact network, and the optical fiber splicing device is connected to the communication optical cable equipment, and the communication optical cable equipment includes a substation, a converter station and a communication room; The specific structure of the optical fiber splicing device connected to the communication optical cable equipment is as follows: the load-bearing cable (2) is connected to the terminal joint box (4), and then is led along the pole tower of the contact network pole (3) to the optical fiber splicing box (11) arranged on the contact network pole (3) through the non-metallic optical cable (40); The optical fiber splicing box (11) is deployed in a safe area on the pole tower, the non-metallic optical cable (40) is fused with the communication optical cable ADSS (41) in the optical fiber splicing box (11), the other end of the communication optical cable ADSS (41) is led along the inside of the pole tower to the bottom and then extends out of the pole tower, and the extended end of the communication optical cable ADSS (41) is laid into a nearby communication pipeline (42) to the communication optical cable equipment; The optical fiber splicing box (11) is fixed on the contact network pole (3) via a tripod (12).

2. The optical fiber splicing device for an optical fiber-embedded catenary cable of an intelligent overhead contact network as claimed in claim 1, characterized in that: An armored protective layer is provided on the outer surface of the communication optical cable ADSS (41).

3. A contact network intelligent sensing system, characterized in that: The invention comprises a return line (6) containing optical fiber, a load-bearing cable (2), a contact line (1) and a lightning conductor (5), wherein the load-bearing cable (2) and the contact line (1) both comprise the optical fiber splicing device according to any one of claims 1 to 2, and the system further comprises a lightning monitoring module, an icing monitoring module and a vibration monitoring module; the lightning monitoring module comprises a distributed lightning monitoring host (51) and a distributed lightning monitoring slave (52) which are respectively arranged at two ends of the lightning conductor (5) and connected to the internal optical fiber thereof; one end of the internal optical fiber of the return line (6) and the load-bearing cable (2) is connected to an optical multiplexing module (63), and the optical multiplexing module (63) is connected to a distributed icing monitoring device (64) and a distributed vibration analysis multiplexing device (65).

4. The contact network intelligent sensing system according to claim 3, characterized in that: The lightning monitoring module, ice monitoring module and vibration monitoring module are all installed in a traction substation or AT station at one or both ends of the catenary wire (2) and lightning conductor (5) of the railway contact network.

5. A method for optical fiber splicing construction based on the optical fiber splicing device according to any one of claims 1 to 2, suitable for optical fiber bearing cables embedded in intelligent overhead wire network, characterized in that: The method comprises At each anchor section of the contact network, the end close to the contact network and the load-bearing cable is stripped of optical fiber through the terminal joint box and connected to the optical fiber expansion device; The other end of the optical fiber telescopic device is led down to the ground through the contact network pole, and the two optical fibers in the same anchor section joint pass through the underground and are connected through the optical fiber splicing box on the contact network pole; By analogy, the optical fibers between every two adjacent anchor sections are connected through the optical fiber splicing box, thereby completely connecting the optical fibers in the entire contact network together, and finally, the connected optical fibers are connected to the communication optical cable equipment.

6. The optical fiber splicing construction method applicable to the optical fiber-embedded catenary of the intelligent overhead line as claimed in claim 5, characterized in that: The method for connecting the optical fiber splicing device to the communication optical cable equipment comprises the following steps: After the load-bearing cable is separated from the optical fiber by the terminal joint box, the optical signal is led to the optical fiber joint box along the tower through the non-metallic optical cable; The optical fiber splicing box is deployed in a safe area on the tower. The non-metallic optical cable is fused with the communication optical cable ADSS through the optical fiber splicing box to transmit the real-time collected optical signal to the equipment end. After leaving the pole tower, the communication optical cable ADSS is laid into the nearest communication pipeline to the substation, converter station or communication room; wherein the communication optical cable ADSS has an armored protective layer.

7. The optical fiber splicing construction method applicable to the optical fiber-embedded catenary of the intelligent overhead line as claimed in claim 6, characterized in that: The method further comprises Before laying the cables, check the occupancy of the pipelines, clean and place the plastic casing, and insert the traction line. The laying length should not exceed 2km at a time, the laying traction force should not exceed 120kg, and the waterproof reinforcement treatment should be done on the cable head.

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