Series fiber grating sensor wiring structure for monitoring three-phase branch box bus

Abstract

The utility model belongs to the field of high-voltage electrical bus monitoring, and discloses a series fiber grating sensor wiring structure for monitoring a three-phase sub-box bus, which is characterized in that a plurality of rows of sensor groups which are connected in series are arranged along the axial direction of the bus, and three sensors in each row of sensor group are respectively arranged on the A phase, the B phase and the C phase of the bus; and comprehensive monitoring of the three-phase bus is realized. The two adjacent rows of sensor groups and the same row of sensor groups are connected in series through optical fibers to form an integral series connection structure, and the wiring complexity is simplified. The wiring structure adopts a mode that the optical fibers are wired and fixed along the bracket, the part wired along the bus is extremely few, the defect that the optical fibers are directly laid along the bus shell in the traditional wiring structure is avoided, and the optical fibers and accessories do not need to be disassembled and installed when a non-wired area on the bus is repaired, so that the repair workload and the operation difficulty are remarkably reduced, and the repair efficiency is improved. And the maintenance efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of high-voltage electrical busbar monitoring technology, specifically relating to a wiring structure for a series fiber optic grating sensor used in three-phase sub-box busbar monitoring. Background Technology

[0002] High-voltage electrical busbars require monitoring of various parameters during operation to ensure normal operation and fault early warning. Currently, most monitoring systems use fiber optic grating sensors to monitor busbar vibration and identify problems such as flashover breakdown, impacts, loose installation, and abnormal vibrations caused by electrodynamic forces or thermal expansion and contraction.

[0003] Currently, the following methods are often adopted: Figure 1 The monitoring system shown is based on fiber Bragg grating sensors. This system mainly consists of a host computer, communication lines, a demodulator, optical fibers, sensors, and installation accessories. The system uses multiple sensors connected in series in each channel of the demodulator, offering advantages such as fewer system components, lower cost, and convenient installation / maintenance. However, for high-voltage three-phase busbars, existing monitoring systems typically employ a cabling structure where series sensors and their connecting optical fibers are laid directly along the outer casing of each phase busbar. Due to this continuous cabling structure, when any section of the busbar needs to be disassembled for repair, the sensor connecting optical fibers and installation accessories on the busbar must be removed, and then re-installed after repair, increasing the workload and difficulty of repair work and significantly reducing maintenance efficiency.

[0004] It is evident that the existing cabling structure, which uses a continuous laying method along the outer shell of each phase busbar along the series sensors and optical fibers, requires the removal of optical fibers and installation accessories from the faulty section of the busbar during the repair process, increasing the workload of repair and reducing maintenance efficiency. Utility Model Content

[0005] This utility model provides a wiring structure for a series fiber Bragg grating sensor for monitoring a three-phase busbar, which solves the technical problem that the existing wiring structure uses a method of laying the series sensor and optical fiber along the outer shell of each phase busbar. During the repair process, it is necessary to remove the optical fiber and installation accessories of the faulty section of the busbar, which increases the repair workload and reduces the maintenance efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical content:

[0007] A wiring structure for a series fiber Bragg grating sensor used in three-phase busbar monitoring includes:

[0008] Multiple rows of sensor groups are arranged in series along the axial direction of the busbar; adjacent rows of sensor groups are connected by optical fibers.

[0009] Each of the sensor groups comprises three sensors located on the same axis, and the three sensors of each row are arranged on the A-phase, B-phase and C-phase of the busbar respectively and are connected in series through optical fibers;

[0010] The demodulator is connected with the first sensor of the first sensor group through an optical fiber, and the optical fiber is fixed along the bracket;

[0011] In the two adjacent sensor groups, the last sensor of the former group is connected with the first sensor of the latter group through an optical fiber, thereby forming a whole series structure of all the sensor groups;

[0012] The optical fibers between the two-phase busbars are fixed along the bracket.

[0013] Further, the sensor comprises a sensor body and a sensor shell;

[0014] Two wire inlet and outlet interfaces are arranged on the same side of the sensor shell and are used for wire inlet and outlet of the sensor body respectively.

[0015] Further, a through hole is arranged at the bottom of the sensor shell, and the sensor is fixed on the busbar through the mounting accessory.

[0016] Further, the optical fiber of the demodulator is led out through a cable trench or a slot box.

[0017] Further, when the optical fiber of the demodulator is led out through the slot box, a wire protection plate is arranged outside the optical fiber of the demodulator.

[0018] Further, the optical fiber fixed along the bracket is installed on the bracket through a wire clamp.

[0019] Further, the sensor is an optical fiber grating sensor.

[0020] Further, the demodulator is provided with multiple channels, and each channel is connected with one busbar.

[0021] Further, the demodulator is located in the middle of all the busbars, and the demodulator adopts a two-side symmetrical arrangement.

[0022] Further, the demodulator is arranged in the on-site cabinet.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The utility model provides a kind of three-phase sub-box bus monitoring is used with series fiber grating sensor wiring structure, by arranging multiple rows of series sensor groups along bus axial direction, and three sensors in each row of sensor group are respectively set on the A phase, B phase and C phase of bus, overall monitoring of three-phase bus is realized.The adjacent two rows of sensor groups and the same row of sensor group are all connected by fiber, and overall series structure is formed, and wiring complexity is simplified.The wiring structure of the utility model uses the mode of fiber along bracket wiring fixation, and the part along bus wiring is extremely small, avoid the drawback that fiber is directly laid along bus shell in traditional wiring structure, and the area without wiring on bus does not need to remove fiber and installation accessory when repairing, thereby significantly reduce repair workload and operation difficulty, improve maintenance efficiency.

[0025] Preferably, in the utility model, two incoming and outgoing line interfaces are arranged on the same side of the sensor shell, so that the fiber does not bend too much when the sensors are connected in series across the phases, and the incoming and outgoing lines of the fiber are more orderly and orderly, avoiding the crossing and confusion of the fiber, and improving the appearance and maintainability of the wiring.

[0026] Preferably, in the utility model, the through hole is arranged at the bottom of the sensor shell, which is convenient for fixing the sensor on the bus by the installation accessory, so that the installation of the sensor is more firm and reliable, and the installation process is simplified, and the installation efficiency is improved.

[0027] Preferably, in the utility model, the fiber of the demodulator is led out through the cable trench or slot box, which protects the fiber from the interference and damage of the external environment, improves the reliability and service life of the fiber.

[0028] Preferably, in the utility model, when the fiber of the demodulator is led out through the slot box, the wire protection plate outside is further protected, which prevents the fiber from being worn and damaged in the slot box, and improves the overall reliability of the system.

[0029] Preferably, in the utility model, the fiber fixed along the bracket is installed on the bracket by the wire clamp, so that the fiber is fixed more firmly and stably, and the fiber is prevented from shaking and falling off on the bracket, and the safety and reliability of the system are improved.

[0030] Preferably, in the utility model, the demodulator is provided with multiple channels, and each channel is connected with one bus, so that independent monitoring of multiple buses is realized, and the flexibility and expandability of the system are improved.

[0031] Preferably, in the utility model, the demodulator is located in the middle of all buses, and adopts a symmetrical appearance on both sides, which not only saves the fiber wiring length relative to the arrangement at the end of the bus line, but also makes the fiber wiring more balanced and beautiful, reduces the length and loss of the fiber, and improves the overall performance of the system.

[0032] Preferably, in the utility model, the demodulator is arranged in the on-site cabinet, which protects the demodulator from the interference and damage of the external environment, facilitates the debugging and maintenance work, and improves the maintainability and reliability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A vibration monitoring system based on a fiber grating sensor and a traditional wiring mode schematic diagram are provided for the utility model embodiment;

[0034] Figure 2 A sensor in-out line structure diagram of a series fiber grating sensor wiring structure for three-phase box division bus monitoring is provided for the utility model embodiment;

[0035] Figure 3 A side view of the sensor of the series fiber grating sensor wiring structure for three-phase box division bus monitoring is provided for the utility model embodiment;

[0036] Figure 4 An assembly diagram of the sensor of the series fiber grating sensor wiring structure for three-phase box division bus monitoring is provided for the utility model embodiment;

[0037] Figure 5 A front view of the series fiber grating sensor wiring structure for three-phase box division bus monitoring is provided for the utility model embodiment;

[0038] Figure 6 A side view of the series fiber grating sensor wiring structure for three-phase box division bus monitoring is provided for the utility model embodiment;

[0039] Figure 7 A multi-channel series sensor symmetric out-line mode schematic diagram of the series fiber grating sensor wiring structure for three-phase box division bus monitoring is provided for the utility model embodiment.

[0040] REFERENCE SIGNS:

[0041] 1, host computer; 2, communication line; 3, demodulator; 4, optical fiber; 5, sensor; 6, mounting accessory; 7, in-out line interface; 8, through hole; 9, sensor shell; 10, bus; 11, on-site cabinet; 12, cable trench; 13, support; 14, wire protection plate; 15, wire clamp. DETAILED DESCRIPTION

[0042] In order to make the technical problems solved by the utility model, the technical scheme and the beneficial effects more clear and obvious, the following specific embodiments are used to further explain the utility model. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0045] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0046] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0048] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] The technical terms involved in the utility model are explained and described as follows:

[0050] High-voltage electrical bus: an electric energy transmission device mainly composed of a metal enclosed shell and an inner conductor, and an insulating part is usually used to support the inner conductor.

[0051] Three-phase box division: the A, B and C three-phase electric energy of alternating current is transmitted by three high-voltage electrical buses.

[0052] Fiber grating sensor: a sensor for measuring physical quantities through a grating etched on an optical fiber.

[0053] Monitoring system: a combination of multiple devices mainly composed of a sensor, a signal processing unit, a background server and a communication line, and having a function of measuring a certain physical quantity.

[0054] Host computer: a background server in a fiber grating sensing monitoring system.

[0055] Demodulator: a signal transmitting, receiving and processing unit of a fiber grating sensor, which can convert the optical signal corresponding to the measured physical quantity collected by the sensor into a digital electrical signal and transmit it to the host computer.

[0056] In combination with the background technology mentioned above, as shown in Figure 1 The vibration monitoring system based on the fiber grating sensor mainly comprises a host computer 1, a communication line 2, a demodulator 3, an optical fiber 4, a sensor 5 and a mounting accessory 6; the direct laying of the sensor 5 and the connecting optical fiber 4 along the shell of each phase bus in series in each channel of the demodulator 3 will increase the number of the mounting accessory 6, and the connecting optical fiber 4 and the mounting accessory 6 are installed along the line of the entire bus 10, which affects the product appearance; when any section of the bus needs to be disassembled for repair, the connecting optical fiber 4 and the mounting accessory 6 of the sensor above it need to be removed, which increases the repair workload. It can be seen that for the three-phase box division bus of high voltage level, the existing monitoring system usually adopts the wiring structure of the direct laying of the sensor and the connecting optical fiber along the shell of each phase bus in series; when any section of the bus needs to be disassembled for repair, the sensor connecting optical fiber and the mounting accessory on the bus need to be removed, and then the wiring is reinstalled after repair, which increases the repair workload and operation difficulty, greatly reduces the repair efficiency; and the wiring structure of the direct laying along the shell of each phase bus easily leads to a large bending angle of the optical fiber and causes damage and poor appearance.

[0057] The utility model will be further described in detail in combination with the drawings as follows:

[0058] Embodiment

[0059] In order to solve the above problems, the embodiment provides a three-phase sub-box bus monitoring series fiber grating sensor wiring structure, which has the advantages of less wiring along the bus, neat appearance, low cost, convenient disassembly and reassembly, and no need to remove the fiber and accessories when repairing the area without wiring on the bus, thereby reducing the repair workload.

[0060] The embodiment provides a three-phase sub-box bus monitoring series fiber grating sensor wiring structure, which comprises a plurality of sensor groups in multiple rows formed by a plurality of sensors 5, wherein the sensors 5 are fiber grating sensors.

[0061] The sensor groups in multiple rows are arranged along the axial direction of the bus; each row of sensor groups comprises three sensors 5 connected in series by optical fibers 4; and in each row of sensor groups, the three sensors 5 are arranged on the A-phase, B-phase and C-phase of the bus 10 respectively.

[0062] As shown in Figure 2 , in the embodiment, the sensor 5 comprises a sensor body and a sensor shell 9; two wire inlet and outlet interfaces are formed on the same side of the sensor shell 9 for wire inlet and outlet; so that the optical fiber 4 will not be bent too much when the sensor is connected in series across the phase. Figure 3 and Figure 4 As shown, the sensor 5 is provided with a through hole 8 at the bottom for mounting the sensor 5 on the bus 10 shell through the mounting accessory 6.

[0063] As shown in Figure 5 and Figure 6 , the optical fiber 4 leading out of each channel of the demodulator 3 arranged in the on-site cabinet 11 is installed in the cable trench 12 or slot box; one of the optical fibers 4 is led out from the cable trench 12 / slot box opening at the position to be monitored; the three sensors 5 connected in series by the leading-out optical fiber 4 are installed in the corresponding position of the three-phase bus 10 in sequence; the leading-out optical fiber 4 of the last sensor 5 returns to the cable trench 12 / slot box at the opening and continues to walk forward to the next position to be monitored (i.e. the next row) to repeat the above arrangement.

[0064] That is, the demodulator 3 is connected with the first sensor 5 of the first row of sensor groups through the optical fiber 4, and the optical fiber 4 connected with the demodulator 3 is fixed along the bracket 13;

[0065] In the adjacent two rows of sensor groups, the last sensor 5 of the front row is connected with the first sensor 5 of the rear row through the optical fiber 4, forming the overall series connection structure of all sensor groups;

[0066] The optical fibers 4 between the two-phase buses 10 are fixed along the bracket 13.

[0067] The optical fiber 4 between the cable trench 12 / slot box and the bottom of the bracket 13 can be protected by the wire protection plate 14 to avoid hindering the passage;

[0068] In this embodiment, there are other methods for protecting the ground cabling of fiber optic 4 and fixing it on the bracket, such as using steel pipes for wiring.

[0069] The optical fiber 4, arranged along the bracket 13, can be fixed to the bracket 13 using a wire clamp 15; for example... Figure 6 As shown, the wiring on the outer casing of bus 10 is fixed using mounting accessory 6; the optical fiber 4 between the two phase bus 10 is routed along bracket 13.

[0070] like Figure 7 As shown, demodulator 3 is arranged in the middle area of ​​bus 10. The multi-channel demodulator 3 adopts a symmetrical output method on both sides, which can save the length of fiber optic cable 4 compared to the method of arranging it at the end of bus 10.

[0071] Compared with existing shielding structures, the wiring structure for the series fiber Bragg grating sensor for three-phase busbar monitoring provided by this utility model has the following advantages:

[0072] First, the sensor's input and output interfaces are located on the same side of the housing, while the input and output interfaces are arranged on opposite sides of the housing. This structure ensures that the arrangement of the three-phase busbars A, B, and C in series in the same area will not cause excessive bending of the optical fiber wiring, resulting in damage and poor appearance.

[0073] The installation method of mounting accessories through the through-hole at the bottom of the sensor housing is simpler and more secure.

[0074] The series sensors are led out from the opening of the cable trench or trunking and installed sequentially on the three-phase busbar in the same area. The output wire of the last sensor is led back to the cable trench or trunking from the same opening to continue the wiring, and the above arrangement is repeated at the next monitoring location. This method has the advantages of less wiring along the busbar, neat and beautiful appearance, low cost, and convenient disassembly and assembly. Moreover, when repairing areas on the busbar without wiring, there is no need to remove the optical fiber and installation accessories.

[0075] The demodulator (3) is arranged in the middle area of ​​the bus line. The demodulator (3) has multiple channels and adopts a symmetrical output method on both sides. Compared with the method of arranging it at the end of the bus line, it can save the length of the optical fiber (4) and reduce the number of installation accessories (6). The above embodiment is only one of the implementation methods that can realize the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any changes, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. A series fiber grating sensor wiring structure for monitoring a three-phase sectioned bus, characterized by, The application relates to a sensor group for a power line monitoring system. The application comprises: a plurality of rows of sensor groups arranged axially along a busbar (10); optical fibers (4) connecting two adjacent rows of sensor groups; each row of the sensor groups comprises three sensors (5) arranged on the same axis, and the three sensors (5) of each row are arranged on A-phase, B-phase and C-phase of the busbar (10) respectively and are connected in series through the optical fibers (4); a demodulator (3) is connected to the first sensor (5) of the first row of sensor groups through the optical fiber (4), and the optical fiber (4) connected to the demodulator (3) is fixed along a support (13); in two adjacent rows of sensor groups, the last sensor (5) of the former row is connected to the first sensor (5) of the latter row through the optical fiber (4), forming an overall series connection structure of all the sensor groups; 2. The serial FBG sensor wiring structure for monitoring a three-phase sectioned bus according to claim 1, characterized in that, the optical fibers (4) between the two-phase busbars (10) are fixed along the support (13). The sensor (5) comprises a sensor body and a sensor shell (9); 3. The serial FBG sensor wiring structure for monitoring a three-phase sectioned bus according to claim 2, characterized in that, two wire inlet and outlet interfaces (7) are formed on the same side of the sensor shell (9) and are used for wire inlet and outlet of the sensor body respectively.

4. The serial FBG sensor wiring structure for monitoring a three-phase sectioned bus according to claim 1, characterized in that, A through hole (8) is formed in the bottom of the sensor shell (9), and the through hole (8) is used for fixing the sensor (5) on the busbar (10) through a mounting accessory (6).

5. The serial FBG sensor wiring structure for monitoring a three-phase sectioned bus according to claim 4, characterized in that, The optical fiber (4) of the demodulator (3) is led out through a cable trench (12) or a slot box. 6.The three-phase sectioned busbar monitoring series fiber grating sensor wiring structure according to claim 1, characterized in that, When the optical fiber (4) of the demodulator (3) is led out through the slot box, a wire protection plate (14) is sleeved outside the optical fiber (4) of the demodulator (3).

7. The serial FBG sensor wiring structure for monitoring a three-phase sectioned bus according to claim 1, characterized in that, The optical fiber (4) fixed along the support (13) is installed on the support (13) through a wire clamp (15). 8.The three-phase sectioned busbar monitoring series fiber grating sensor wiring structure according to claim 1, characterized in that, The sensor (5) is a fiber grating sensor.

9. The serial FBG sensor wiring structure for monitoring a three-phase sectioned bus according to claim 8, characterized in that, The demodulator (3) is provided with a plurality of channels, and each channel is connected to one busbar (10). 10.The three-phase sectioned busbar monitoring series fiber grating sensor wiring structure according to claim 1, characterized in that, The demodulator (3) is located in the middle of all the busbars (10), and the demodulator (3) adopts a two-side symmetrical arrangement mode. The demodulator (3) is arranged in an on-site cabinet (11).

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