A cable termination monitoring device

Abstract

The utility model discloses a cable end forming monitoring device belongs to railway signal safety monitoring field. In view of the existing wall -embedded collection box scheme construction complex, wiring is long, is easily interfered, capacity is limited etc.

Description

Technical Field

[0001] This application belongs to the field of railway signaling system safety monitoring technology, and in particular relates to a cable termination monitoring device. Background Technology

[0002] In railway signaling systems, the termination of signal cables is a critical node connecting the cables to indoor equipment. The condition of its grounding system (such as the power frequency leakage current of the steel mesh shielding layer and the aluminum sheath shielding layer, as well as the current discharged during lightning strikes) directly affects the safety and stability of signal transmission. To ensure reliable signal transmission, these currents need to be effectively monitored.

[0003] Current technology typically involves installing O-type power frequency current transformers and Rogowski coil current transformers on the grounding conductor, and then installing corresponding terminated power frequency current collectors and lightning current collectors in a wall-mounted acquisition box. Data is then collected through a secondary terminated collector installed in the termination cabinet. However, this approach has many drawbacks, limiting its effectiveness in practical applications. This approach has the following significant disadvantages:

[0004] (1) The installation is complicated, requiring a special wall-mounted monitoring and data acquisition box, which involves a large amount of construction and high requirements for site space;

[0005] (2) The wiring is complicated. The current transformer signal line needs to be led over a long distance (up to 10 meters) to the wall-mounted acquisition box. The wiring work is extensive and there are many cables.

[0006] (3) It is susceptible to interference. Weak analog signals over long distances are easily subject to electromagnetic interference, which affects measurement accuracy.

[0007] (4) Limited capacity: The number of acquisition modules in a single acquisition box is limited, with a maximum of 56 power frequency channels and 2 lightning channels. Expandability is limited by the space of the box.

[0008] (5) Inconvenient to maintain: The enclosure is embedded in the wall, making equipment maintenance or replacement relatively inconvenient. Utility Model Content

[0009] The purpose of this application is to provide a cable termination monitoring device, which is a cable termination monitoring device with optimized structure, convenient installation, strong anti-interference ability and improved capacity, and can overcome the above-mentioned technical shortcomings.

[0010] To achieve the above-mentioned objectives, the technical solution adopted in this application is as follows:

[0011] This application provides a cable termination monitoring device, including: an O-type closed-loop power frequency current transformer, a Rogowski coil current transformer, and a secondary termination acquisition unit; it also includes: a termination monitoring and acquisition assembly, which includes:

[0012] The modular base is used to fix and install the data acquisition equipment (such as grounding busbars) and ensure electrical insulation between the equipment and the modular base body;

[0013] An integrated data acquisition module is fixedly mounted on a combined base or mounted closely adjacent to the combined base on a supporting structure; the integrated data acquisition module includes a power frequency current acquisition unit and a lightning current acquisition unit.

[0014] The O-type closed-loop power frequency current transformer is installed on the grounding conductor and connected to the power frequency current collector of the integrated collector module through a first signal line with a length not exceeding the first preset value.

[0015] The Rogowski coil current transformer is installed near the grounding busbar and connected to the lightning current collector of the integrated collector module via a second signal line with a length not exceeding the second preset value.

[0016] In some embodiments, the integrated acquisition module has an acquisition port for acquiring at least 16 analog signal quantities, which is used to connect multiple O-type closed-loop power frequency current transformers (each transformer corresponds to one signal) and / or Rogowski coil current transformers.

[0017] In some embodiments, the support structure is a cable rack.

[0018] In some embodiments, the first preset value is 0.5 meters and the second preset value is 0.5 meters.

[0019] In some embodiments, the integrated data acquisition module further includes a communication unit, which connects the power frequency current acquisition unit and the lightning current acquisition unit, and is used to upload the acquired data to the centralized monitoring system via a communication bus.

[0020] In some embodiments, the assembly base is made of a high-strength insulating material to ensure reliable installation between the grounding busbar and the data acquisition module and mounting bracket. It should be understood that any insulating material that ensures reliable installation between the grounding busbar and the data acquisition module and mounting bracket can be considered a high-strength insulating material.

[0021] In some embodiments, the grounding conductor is a grounding conductor inserted between the grounding busbar and the terminal box bolt.

[0022] In some embodiments, the O-type closed-loop power frequency current transformer is used to collect the power frequency leakage current to ground of the cable steel mesh shielding layer and aluminum sheath shielding layer; the Rogowski coil current transformer is used to collect the current discharged during lightning strikes and its waveform.

[0023] The power frequency current acquisition unit is used to receive and process the power frequency leakage current signal from the O-type closed-loop power frequency current transformer.

[0024] The lightning current collector is used to receive and process lightning current signals from the Rogowski coil current transformer;

[0025] The secondary termination collector is installed and fixed inside the cable termination cabinet to collect the power frequency leakage current to ground on the busbar of the secondary termination cabinet.

[0026] In some embodiments, the area near the grounding busbar is specifically the lightning protection grounding wire access point.

[0027] In some embodiments, the end-to-end monitoring and acquisition combination (combination base + integrated acquisition module) is modularly designed, which facilitates on-site installation, disassembly and maintenance.

[0028] Compared with the prior art, the beneficial effects of the embodiments of this application are:

[0029] The cable termination monitoring device provided in this application has the following advantages:

[0030] (1) Convenient and efficient construction and installation:

[0031] The bulky cable termination monitoring and acquisition box that required wall mounting was completely eliminated.

[0032] The modularly designed end-to-end monitoring and acquisition unit (combined base + integrated acquisition unit) can be directly installed on cable racks or existing support structures nearby, greatly simplifying the installation process and significantly reducing the amount of construction work.

[0033] The monitoring equipment is directly mounted on the modular base, resulting in a compact structure and flexible installation location.

[0034] (2) Wiring is greatly simplified:

[0035] The length of the current transformer signal line is limited to 0.5 meters, avoiding complex wiring up to 10 meters long.

[0036] The number of cables has been significantly reduced, and the site is much cleaner.

[0037] (3) Significantly enhanced anti-interference capability:

[0038] The ultra-short signal transmission distance (≤0.5 meters) greatly reduces the risk of electromagnetic interference (EMI) during signal transmission, ensuring the accuracy (±0.5%FS) and reliability of monitoring data, which is especially crucial for the accurate capture of lightning current waveforms (sampling period 0.5µs).

[0039] (4) Increased equipment capacity:

[0040] A single integrated data acquisition module increases the acquisition capability by at least 16 analog signals, doubling the capacity of a single power frequency acquisition module compared to existing acquisition solutions. It can monitor more cables or offer greater configuration flexibility within the same space footprint.

[0041] (5) Improved structural stability:

[0042] The integrated data acquisition module forms a compact and stable whole with the combined base, or is closely installed near the combined base, making the structure more stable and reliable.

[0043] The modular design facilitates maintenance and replacement.

[0044] (6) Saves space:

[0045] No need to reserve wall space for the data collection box, making it more suitable for environments with limited on-site space. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 A terminal definition diagram of the terminal monitoring module provided in an embodiment of this application is shown.

[0048] Figure 2 A schematic diagram of the primary side wiring for terminal monitoring provided in an embodiment of this application is shown.

[0049] Figure 3 A schematic diagram of the secondary side wiring for terminal monitoring provided in an embodiment of this application is shown.

[0050] Figure 4 A schematic diagram of the end-to-end monitoring installation structure provided in an embodiment of this application is shown.

[0051] Figure 5 for Figure 4 The diagram shown in the upper center box.

[0052] Figure 6 for Figure 4 The diagram shown in the lower center box.

[0053] Figure 7 This is a diagram simulating the on-site installation.

[0054] Illustration:

[0055] 1. Terminal box bolts; 2. Grounding wire; 3. Grounding busbar; 4. O-type closed-loop power frequency current transformer; 5. Rogowski coil current transformer; 6. Combined base; 7. Integrated data acquisition module; 71. Power frequency current collector; 72. Lightning current collector; 8. Cable rack. Detailed Implementation

[0056] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0057] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0059] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0060] Please see Figures 1 to 6 As shown, the cable termination monitoring device provided in this application mainly includes:

[0061] Insert a grounding conductor 2 between the grounding busbar 3 and the terminal bolt 1. For example, the grounding conductor 2 is a grounding copper conductor.

[0062] An O-type closed-loop power frequency current transformer 4 is installed on the grounding conductor 2 to monitor the power frequency leakage current.

[0063] Install a Rogowski coil current transformer 5 near the grounding busbar 3 (such as the lightning protection grounding inlet point) to monitor the lightning strike current and waveform.

[0064] The core component is an end-to-end monitoring and data acquisition system. This system includes:

[0065] Composite base 6: Made of high-strength materials (such as aluminum alloy and stainless steel).

[0066] The grounding busbar 3 is fixedly installed on the combined base 6 by bolts or other means to ensure electrical insulation between the busbar and the base and subsequent installation structure.

[0067] Integrated data acquisition module 7: This module includes a power frequency current collector 71, a lightning current collector 72, and a communication unit. It is fixedly mounted on the combined base 6, or mounted on a nearby cable rack 8 adjacent to the combined base 6 via a bracket. A key requirement is that the type O current transformer and the lightning current transformer are connected to their corresponding interfaces on the integrated data acquisition module 7 via extremely short signal lines (≤0.5 meters in length). This module is designed to acquire at least 16 analog signals.

[0068] The secondary termination collector is installed independently in the cable termination cabinet to monitor the leakage current of the secondary busbar.

[0069] The integrated data acquisition module 7 and the secondary terminal data acquisition module are connected to the station of the centralized signal monitoring system via CAN fieldbus communication.

[0070] The installation process of the cable termination monitoring device provided in this application embodiment is briefly described as follows:

[0071] (1) Disconnect the original connection between the grounding busbar 3 and the terminal box bolt 1.

[0072] (2) Connect a grounding wire 2 between the two.

[0073] (3) The grounding conductor 2 passes through the O-type power frequency current transformer 4 installed on the cable rack 8.

[0074] (4) Install Rogowski coil current transformer 5 near grounding bus 3.

[0075] (5) Install the combined base 6 in a suitable location such as the cable rack 8 or the wall.

[0076] (6) The grounding busbar 3 is fixedly installed on the combined base 6.

[0077] (7) Install the integrated data acquisition module 7 on the combined base 6 or on the cable rack 8 adjacent to the combined base 6.

[0078] (8) Connect the O-type current transformer and the lightning current transformer to the integrated data acquisition module 7 using a signal line with a length not exceeding 0.5 meters.

[0079] (9) Install the secondary terminal collector in the terminal cabinet.

[0080] (10) Connect the communication bus and the power cord.

[0081] In the above embodiments, such as Figure 2 , Figure 3 , Figure 4As shown, the output of the terminated power frequency current transformer is connected to the terminated power frequency current collector 71 inside the terminated monitoring box. Each terminated power frequency current collector 71 can collect 16 current signals. The output of the terminated lightning current transformer is connected to the terminated lightning current collector 72 inside the terminated monitoring box. Each terminated lightning current collector 72 can collect one current signal. The data transmission of the terminated power frequency current collector 71 is connected in series to the CAN interface of the communication extension, and the terminated lightning current collector 72 is connected separately to the 485 interface of the communication extension. Two terminated power frequency current transformers need to be installed at the grounding bolt of each cable in the cable section.

[0082] As an example, Figure 7 This diagram simulates the on-site installation. The equipment is installed using a DIN rail mounting system. The grounding busbar 3 is separated from the termination box bolt 1, and a grounding wire 2 (yellow-green wire) is inserted in the middle. An O-type closed-loop power frequency current transformer is installed on the wire, and the termination monitoring and acquisition assembly is installed below. The grounding busbar 3 is installed on the assembly and kept insulated from it. The secondary termination acquisition unit is directly installed and fixed inside the cable termination cabinet. This structure makes the construction and installation of the equipment more convenient and will significantly reduce the amount of construction and wiring work.

[0083] The working principle of the aforementioned cable termination monitoring device is as follows: The O-type closed-loop power frequency current transformer 4 detects the power frequency leakage current on the grounding conductor, and the Rogowski coil current transformer 5 detects the lightning discharge current. The output signals of these transformers are directly transmitted via a ≤0.5-meter signal line to the integrated data acquisition module 7, which is installed nearby on the cable rack 8, for processing. This module sends the processed data (including power frequency leakage current value, lightning strike current count, and waveform) to the centralized monitoring system via a communication bus. The secondary termination data acquisition unit is independently installed in the termination cabinet, collecting and uploading the secondary side leakage current. The grounding busbar 3 is fixed to the combined base 6, ensuring its insulation from the monitoring assembly.

[0084] In summary, this embodiment, through its innovative "terminal monitoring and acquisition combination (combined base + integrated acquisition module)" structural design, achieves extremely short-distance (≤0.5 meters) acquisition of instrument transformer signals and localized equipment installation (cable rack installation nearby). It also integrates power frequency and lightning acquisition functions and increases the capacity of a single module. This perfectly solves the problems of cumbersome construction, lengthy wiring, susceptibility to interference, and limited capacity associated with the wall-mounted acquisition box in Scheme 1, significantly improving the construction efficiency, system reliability, and maintenance convenience of cable terminal monitoring.

[0085] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A cable termination monitoring device, characterized in that, include: The O-type closed-loop power frequency current transformer, the Rogowski coil current transformer, and the secondary terminal acquisition unit further include: a terminal monitoring and acquisition assembly, wherein the terminal monitoring and acquisition assembly includes: A combined base, on which a grounding busbar is fixedly installed; An integrated data acquisition module is fixedly mounted on the combined base or mounted closely adjacent to the combined base on a support structure; the integrated data acquisition module includes a power frequency current acquisition device and a lightning current acquisition device. The O-type closed-loop power frequency current transformer is installed on the grounding conductor and connected to the power frequency current collector of the integrated collector module through a first signal line with a length not exceeding a first preset value. The Rogowski coil current transformer is installed near the grounding busbar and connected to the lightning current collector of the integrated collector module via a second signal line with a length not exceeding a second preset value.

2. The cable termination monitoring device according to claim 1, characterized in that, The integrated acquisition module has acquisition ports for acquiring at least 16 analog signal quantities, which are used to connect multiple O-type closed-loop power frequency current transformers and / or Rogowski coil current transformers.

3. The cable termination monitoring device according to claim 1, characterized in that, The supporting structure is a cable rack.

4. The cable termination monitoring device according to claim 1, characterized in that, The first preset value is 0.5 meters, and the second preset value is 0.5 meters.

5. The cable termination monitoring device according to claim 1, characterized in that, The integrated data acquisition module also includes a communication unit, which connects the power frequency current acquisition unit and the lightning current acquisition unit, and is used to upload the acquired data to the centralized monitoring system via a communication bus.

6. The cable termination monitoring device according to claim 1, characterized in that, The composite base is made of high-strength insulating material.

7. The cable termination monitoring device according to claim 1, characterized in that, The grounding conductor is a grounding conductor inserted between the grounding busbar and the terminal box bolt.

8. The cable termination monitoring device according to claim 1, characterized in that, The O-type closed-loop power frequency current transformer is used to collect the power frequency leakage current to ground of the cable steel mesh shielding layer and aluminum sheath shielding layer; the Rogowski coil current transformer is used to collect the current discharged during lightning strikes and its waveform. The power frequency current acquisition device is used to receive and process the power frequency leakage current signal from the O-type closed-loop power frequency current transformer. The lightning current acquisition device is used to receive and process the lightning current signal from the Rogowski coil current transformer; The secondary termination collector is installed and fixed inside the cable termination cabinet and is used to collect the power frequency leakage current to ground on the busbar of the secondary termination cabinet.

9. A cable termination monitoring device according to claim 1, characterized in that, The area near the grounding busbar is specifically the connection point for the lightning protection grounding wire.

10. A cable termination monitoring device according to claim 1, characterized in that, The terminal monitoring and acquisition system is modularly designed.

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