Distributed optical fiber temperature measurement system

Abstract

The utility model belongs to the technical field of optical fiber temperature measurement, and relates to a distributed optical fiber temperature measurement system, which comprises a temperature measurement sensing optical fiber and an optical fiber thermodetector. The temperature measurement sensing optical fiber is wound on the outer wall of the cable along the axial direction of the cable; the temperature measurement sensing optical fiber is arranged on the outer surface of the cable joint according to an annular structure; and the temperature measurement sensing optical fiber is connected with the optical fiber thermodetector. According to the utility model, through the temperature measurement sensing optical fibers arranged on the cable and the cable joint, temperature data in operation are collected in real time, and the data are transmitted to the optical fiber thermodetector in real time, so that on-line monitoring of temperature is realized, and safe operation of production is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical fiber temperature measurement, and relates to a distributed optical fiber temperature measurement system, which is used for the temperature measurement of cables in process production. Background Art

[0002] The power supply system is an important source of power for industrial production, providing electricity for machinery, equipment, production lines, etc., to ensure the normal operation of industrial production. In industrial production, overheating of power supply cables and cable connectors is a common accident hazard. If it is not discovered and handled in time, it will cause cable damage, leading to unplanned power outages, and even cause explosions and fires and other malignant accidents, seriously affecting the safe and stable operation of the power supply system. Therefore, reducing unplanned power outages, reducing operating costs, preventing the occurrence of malignant accidents such as fires, and ensuring the safe operation of the power grid system are of great significance to industrial production.

[0003] Patent document CN219038212U discloses an intelligent distributed optical fiber temperature measurement system, including a bus duct, wherein the bus duct is equipped with a bus connector, the bus connector is equipped with an optical cable body, the optical cable body is in a herringbone shape, the optical cable body is equipped with a fixing, the optical cable body is equipped with a temperature measuring optical cable, the bus duct is equipped with a cable tie, the optical cable body is equipped with an optical cable ring, and the optical cable ring includes an optical cable ring tail end and an optical cable ring start end. The existing bus duct is easily affected by the ambient temperature and humidity, and thermal expansion occurs. Cold shrinkage, surface scaling, oxidation or corrosion can cause loose contacts and poor contact. However, in some large factories, super high-rise buildings and other occasions, the bus duct is generally fully enclosed and energized, which is inconvenient for manual inspection and it is easy to ignore the problem of effective supervision. In addition, in actual production, as the operation time of optical fiber cables increases, the insulation of cables deteriorates, resulting in fires in the upper cable trays and cables of the SVG room, fires in the reactive compensation main incoming cables, and frequent fires in the batching bins and bridges, posing serious hidden dangers to production safety. Utility Model Content

[0004] In order to solve the technical problem that the operation time of existing cables increases, the insulation of cables deteriorates, resulting in frequent fires and causing serious hidden dangers to production safety, the utility model provides a distributed optical fiber temperature measurement system.

[0005] The utility model collects temperature data in real time during operation through temperature measuring sensor optical fibers arranged on cables and cable joints, and transmits the data to an optical fiber thermometer in real time, thereby realizing online temperature monitoring and ensuring safe production operation.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A distributed optical fiber temperature measurement system comprises an optical fiber for temperature measurement and an optical fiber thermometer; the optical fiber for temperature measurement and the optical fiber are wound around the outer wall of the cable along the axial direction of the cable; the optical fiber for temperature measurement and the optical fiber are arranged in a ring structure on the outer surface of the cable joint; the optical fiber for temperature measurement and the optical fiber thermometer are connected.

[0008] It is further defined that the temperature sensing optical fiber is wound around the outer wall of the cable in an S shape.

[0009] It is further defined that the winding length of the temperature sensing optical fiber on the cable is 1.2 to 2.0 times the length of the cable segment.

[0010] It is further defined that the temperature sensing optical fiber is laid out at a length of 4.0 meters to 5.5 meters on the cable connector.

[0011] It is further defined that there are one or more cable connectors, and the plurality of cable connectors are spaced apart and distributed on the cable.

[0012] It is further defined that the distributed optical fiber temperature measurement system also includes an alarm device; an interface is provided on the optical fiber thermometer, and the temperature measurement sensing optical fiber is connected to the alarm device via the interface.

[0013] It is further defined that there are one or more cables. When there are multiple cables, there are multiple temperature sensing optical fibers, interfaces and alarm devices. A temperature sensing optical fiber is wound around each cable, and the number of temperature sensing optical fibers, the number of interfaces and the number of alarm devices correspond one to one.

[0014] It is further defined that the temperature sensing optical fiber includes an optical fiber sensing layer, an inner coating layer and a protective layer wrapped in sequence from the inside to the outside; the optical fiber sensing layer is connected to the optical fiber thermometer.

[0015] It is further defined that the distributed optical fiber temperature measurement system also includes fasteners respectively arranged on the cable and the cable connector; the temperature measurement sensing optical fiber is fastened to the cable and the cable connector respectively by the fasteners.

[0016] It is further defined that the distributed optical fiber temperature measurement system also includes a display panel connected to the optical fiber thermometer and the alarm device respectively.

[0017] The beneficial effects of the utility model are:

[0018] 1. The distributed optical fiber temperature measurement system of the utility model includes an optical fiber for temperature measurement and a fiber optic thermometer; the optical fiber for temperature measurement and the fiber optic thermometer are wound around the outer wall of the cable along the axial direction of the cable; the optical fiber for temperature measurement and the fiber optic thermometer are arranged in a ring structure on the outer surface of the cable joint; the optical fiber for temperature measurement and the fiber optic thermometer are connected. By distributing the optical fiber for temperature measurement and the fiber optic thermometer on the cable and the cable joint, the real-time collection of temperature data during cable operation is realized, and the collected temperature data is transmitted to the fiber optic thermometer in real time, so as to realize online monitoring of temperature and ensure safe production operation.

[0019] 2. In the utility model, the temperature sensing optical fiber is wound on the outer wall of the cable in an S shape; the temperature sensing optical fiber is arranged in a ring structure on the surface of the cable joint to ensure that the temperature of each point on the cable and the cable joint can be monitored, making the monitored temperature data more accurate, thereby making accurate judgments for the safe operation of the cable.

[0020] 3. In the utility model, a temperature sensing optical fiber is wound around each of the multiple cables, so that the temperature sensing optical fiber monitors the temperature of one cable respectively, and simultaneously realizes distributed monitoring of the temperatures of multiple cables. Thus, when a fault occurs, accurate positioning can be achieved, the fault point can be quickly found, and maintenance work can be guided.

[0021] 4. The utility model arranges fasteners on the cable and the cable joint respectively, and the temperature sensing optical fiber is fastened to the cable and the cable joint respectively by the fasteners to prevent the temperature sensing optical fiber from falling, ensure that the temperature sensing optical fiber is closely attached to the component to be measured, and the temperature measurement is more accurate.

[0022] 5. The utility model also includes an alarm device. An interface is provided on the optical fiber thermometer, and the temperature sensing optical fiber is connected to the alarm device via the interface. When there are multiple cables, there are multiple alarm devices, and different temperature measuring optical fibers correspond to different alarm devices. When the temperature of one of the cables or the cable joint is too high, the corresponding alarm device sounds an alarm to remind maintenance, thereby realizing intelligent analysis and positioning, and is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the temperature measurement system of the utility model;

[0024] Figure 2 This is a schematic diagram of the layout of the temperature measurement optical fiber on the cable;

[0025] Figure 3 This is a schematic diagram of the layout of the temperature measuring optical fiber on the cable connector;

[0026] Figure 4 This is a schematic diagram of the internal structure of the temperature measuring optical fiber;

[0027] in:

[0028] 1—fiber optic thermometer; 2—display panel; 3—alarm device; 4—temperature sensing optical fiber; 401—fiber optic sensing layer; 402—inner coating layer; 403—protective layer; 5—fastener; 6—cable tray; 7—cable; 8—cable connector. DETAILED DESCRIPTION

[0029] The present invention is now described in detail with reference to the accompanying drawings and embodiments.

[0030] Example 1

[0031] See also Figure 1 The distributed optical fiber temperature measurement system provided in this embodiment includes a temperature sensing optical fiber 4 and an optical fiber thermometer 1; the temperature sensing optical fiber 4 is wound around the outer wall of the cable 7 along the axial direction of the cable 7; the temperature sensing optical fiber 4 is arranged in a ring structure on the outer surface of the cable connector 8; the temperature sensing optical fiber 4 is connected to the optical fiber thermometer 1.

[0032] See also Figure 2 The temperature sensing optical fiber 4 is wound in an S shape on the outer wall of the cable 7. During implementation, the cable 7 is installed on the cable tray 6. The cable 7 includes three parallel conductive wires. The temperature sensing optical fiber 4 is wound on the outer walls of the three conductive wires at the same time and extends from one end of the cable 7 to the other end along the axial direction of the cable 7. When the temperature sensing optical fiber 4 is wound, it is required to be wound evenly.

[0033] Further, preferably, the winding length of the temperature sensing optical fiber 4 on the cable 7 is 1.2 to 2.0 times the length of the cable 7. More preferably, the winding length of the temperature sensing optical fiber 4 on the cable 7 is 1.5 times the length of the cable 7. At this time, the winding is more uniform and can be laid from one end of the cable 7 to the other end of the cable 7, ensuring that the monitored temperature is accurate.

[0034] See also Figure 3 The temperature sensing optical fiber 4 is laid in a ring structure on the surface of the cable joint 8. The cable joint 8 is mainly used to connect two adjacent cables 7. The temperature sensing optical fiber 4 is laid on one side of the cable joint 8, and the temperature sensing optical fiber 4 is laid in a ring structure.

[0035] In this embodiment, there are one or more cable joints 8, and the plurality of cable joints 8 are distributed at intervals on the cable 7. The laying structure of the temperature sensing optical fiber 4 on each cable joint 8 is the same.

[0036] by Figure 3Taking the cable joint 8 shown as an example, its cross section is a hexagonal structure, and the temperature sensing optical fiber 4 is laid from the cable 7 at the right end of the cable joint 8 to the cable 7 at the left end. The temperature sensing optical fiber 4 is laid along a straight line from the cable 7 at the right end to the right end of the cable joint 8, and then laid from the outermost side to the left end of the cable joint 8 until it returns to the starting point, and then continues to lay from the right end of the cable joint 8 to the left end of the cable joint 8. The laying is repeated until it is laid to the center of the cable joint 8 and extends to the cable 7 on the left along a straight line.

[0037] Preferably, the length of the temperature measuring sensing optical fiber 4 is 4.0 meters to 5.5 meters; more preferably, the length of the temperature measuring sensing optical fiber 4 is 5.0 meters.

[0038] See also Figure 4 The temperature sensing optical fiber 4 includes an optical fiber sensing layer 401, an inner coating layer 402 and a protective layer 403 which are wrapped from the inside to the outside in sequence; the optical fiber sensing layer 401 is connected to the optical fiber thermometer 1 to realize the reception and transmission of data signals. Specifically, the optical fiber sensing layer 401 is a SiO2 glass fiber core, the inner coating layer 402 is a glass cladding layer, and the protective layer 403 is an insulating layer, which plays an insulating and protective role.

[0039] In practice, the temperature sensing optical fiber 4 is both a temperature sensor (equivalent to each point on the optical fiber being a temperature sensor) and a transmission carrier of temperature information. It can continuously measure temperature at any point, that is, measure the real-time temperature of any point along the optical fiber laying line, and can flexibly measure the temperature distribution on points, lines, and surfaces.

[0040] Preferably, the model of the fiber optic thermometer 1 is LCZ201-6-6, with a temperature measurement distance of 8km, 6 temperature measurement channels (one instrument is connected to 6 temperature measurement sensing optical fibers 4), a working power supply of 220V, 50HZ, a working temperature of -10℃-50℃, and an interface (interface of the temperature measurement sensing optical fiber 4) of FC / APC; one end of the temperature measurement sensing optical fiber 4 is suspended, and the other end is connected to the interface on the fiber optic thermometer 1. When in use, the temperature data on the cable 7 measured by the temperature measurement sensing optical fiber 4 is transmitted to the fiber optic thermometer 1 through the interface, and is converted to 485 communication by the fiber optic thermometer 1 and then transmitted out.

[0041] Preferably, the model of the temperature sensing optical fiber 4 is GL-KZ-30, and the temperature measurement range of the optical fiber sensing layer 401 is -40℃~120℃. The function of the optical fiber sensing layer 401 is to sense the temperature of the cable, and its working principle is to obtain spatial temperature distribution information by using the spontaneous Raman scattering and optical time domain reflectometry (OTDR) principle generated when light is transmitted in the optical fiber; when a laser pulse of a certain energy and width is injected into the optical fiber, the laser spontaneously generates Raman scattered light waves while propagating forward in the optical fiber, and the intensity of the Raman scattered light waves is affected by the temperature of the optical fiber scattering point and changes. By obtaining the back Raman light waves scattered back along the optical fiber, the temperature change of the optical fiber scattering point can be demodulated, and the temperature value of each temperature measurement point of the optical fiber can be further demodulated; then, the collected temperature data is transmitted to the optical fiber thermometer 1.

[0042] In this embodiment, the distributed optical fiber temperature measurement system also includes an alarm device 3; the optical fiber thermometer 1 is connected to the alarm device 3 through a relay. When the temperature of the monitored point on the cable 7 exceeds the alarm threshold set by the system, the alarm device 3 automatically starts and sends an alarm to the on-duty personnel, who further inspect or repair the high temperature point. The size of the alarm value is predetermined according to the use of the cable 7 during operation and will not be elaborated here.

[0043] Example 2

[0044] On the basis of Example 1, the distributed optical fiber temperature measurement system provided in this embodiment has multiple cables 7, multiple temperature sensing optical fibers 4, multiple interfaces and multiple alarm devices 3, one temperature sensing optical fiber 4 is wound around each cable 7, and multiple temperature sensing optical fibers 4, multiple interfaces and multiple alarm devices 3 are connected one by one. Real-time monitoring of cables at different stages is achieved, and the temperature measurement range is expanded.

[0045] Preferably, online temperature monitoring and early warning are carried out on cables in four key locations, namely, the cable tunnel in a certain production area, the cable tray of the 1# electric furnace, the cable tray of the 2# electric furnace, and the cable tray of the coal conveyor belt of the fuel transportation building. According to the number and length of cables, four temperature sensing optical fibers 4 are designed, with one being 4 km long and three being 8 km long. Each temperature sensing optical fiber 4 monitors the cable of the corresponding cable tray respectively. The temperature sensing optical fiber 4 is laid in an S shape on the outside of the cable 7 on each layer of the cable tray to cover each cable 7. At the same time, each cable joint 8 is laid in a ring-shaped coil and marked on the cable tray 6 to implement key monitoring of the cable joints 8. Then the four temperature sensing optical fibers 4 are connected to the four interfaces of the optical fiber thermometer 1 respectively. The optical fiber thermometer 1 is divided into four paths, each of which is connected to four alarm devices 3 through a relay. When in use, each temperature sensing optical fiber 4 measures the temperature of the cable at different production stages respectively. When the alarm threshold is exceeded, the corresponding alarm device 3 sounds an alarm to accurately locate the cable, thereby realizing remote online monitoring and early warning.

[0046] Example 3

[0047] See also Figure 2 and Figure 3 Based on Example 1 or Example 2, the distributed optical fiber temperature measurement system provided in this embodiment also includes fasteners 5 respectively arranged on the cable 7 and the cable connector 8; the temperature sensing optical fiber 4 is fastened to the cable 7 and the cable connector 8 respectively through the fasteners 5.

[0048] There are multiple fasteners 5. For the cable 7, multiple fasteners 5 are set on each conductive line, and the fasteners 5 on adjacent conductive lines are staggered to achieve a close connection between the cable 7 and the temperature sensing optical fiber 4, so that the temperature sensing optical fiber 4 and the cable 7 fit closely, and the temperature measurement is more accurate. For the cable joint 8, multiple fasteners 5 are evenly distributed along the length direction of the cable joint 8, and each fastener 5 spans the width direction of the cable joint 8, so that the temperature sensing optical fiber 4 and the cable joint 8 are tightly installed.

[0049] During implementation, the fastener 5 is made of insulating material and is a binding strap, a cable tie or other fastening components.

[0050] Example 4

[0051] See also Figure 1 On the basis of Example 1, the distributed optical fiber temperature measurement system provided in this embodiment further includes a display panel 2 connected to the optical fiber thermometer 1 and the alarm device 3 respectively. The temperature measurement result and the alarm status are displayed on the display panel 2 for easy viewing by operators.

[0052] The above is a preferred embodiment of the utility model. The temperature data collected in real time by the temperature sensing optical fiber arranged on the cable and the cable joint can be displayed in real time on the optical fiber thermometer to complete the online monitoring of the temperature of the cable and the cable joint on the cable tray; when the temperature exceeds the allowable range, the alarm action is completed; and the data is uploaded to the maintenance monitoring room through the data interface on the optical fiber thermometer. In addition, the temperature measurement data on the optical fiber thermometer can be remotely shared through the network.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the above embodiments, any modification of the technical solution recorded in the above embodiments or equivalent replacement of some of the technical features therein by ordinary technicians in this field should fall within the protection scope of the utility model.

Claims

1. A distributed optical fiber temperature measurement system, characterized in that: It comprises a temperature sensing optical fiber (4) and an optical fiber thermometer (1); the temperature sensing optical fiber (4) is wound around the outer wall of the cable (7) along the axial direction of the cable (7); the temperature sensing optical fiber (4) is arranged on the outer surface of the cable connector (8) in an annular winding structure; the temperature sensing optical fiber (4) is connected to the optical fiber thermometer (1); The temperature sensing optical fiber (4) is wound in an S shape on the outer wall of the cable (7); The winding length of the temperature sensing optical fiber (4) on the cable (7) is 1.2 to 2.0 times the length of the cable (7); The temperature sensing optical fiber (4) comprises an optical fiber sensing layer (401), an inner coating layer (402) and a protective layer (403) which are wrapped in sequence from the inside to the outside; the optical fiber sensing layer (401) is connected to the optical fiber thermometer (1).

2. The distributed optical fiber temperature measurement system according to claim 1, characterized in that: The temperature sensing optical fiber (4) is laid out on the cable connector (8) in a length of 4.0 to 5.5 meters.

3. The distributed optical fiber temperature measurement system according to claim 2, characterized in that: There are one or more cable connectors (8), and the plurality of cable connectors (8) are distributed at intervals on the cable (7).

4. The distributed optical fiber temperature measurement system according to claim 3, characterized in that: The distributed optical fiber temperature measurement system further comprises an alarm device (3); an interface is provided on the optical fiber temperature measuring instrument (1), and the temperature measuring sensing optical fiber (4) is connected to the alarm device (3) via the interface.

5. The distributed optical fiber temperature measurement system according to claim 4, characterized in that: There are one or more cables (7). When there are more than one cables (7), there are more than one temperature sensing optical fibers (4), interfaces and alarm devices (3). A temperature sensing optical fiber (4) is wound around each cable (7), and the number of the temperature sensing optical fibers (4), the number of the interfaces and the number of the alarm devices (3) correspond to each other.

6. The distributed optical fiber temperature measurement system according to claim 5, characterized in that: The distributed optical fiber temperature measurement system further comprises fasteners (5) respectively arranged on the cable (7) and the cable connector (8); the temperature measurement sensing optical fiber (4) is fastened to the cable (7) and the cable connector (8) respectively via the fasteners (5).

7. The distributed optical fiber temperature measurement system according to claim 6, characterized in that: The distributed optical fiber temperature measurement system further comprises a display panel (2) connected to the optical fiber temperature measuring instrument (1) and the alarm device (3) respectively.

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