Pre-warning system and pre-warning method for current-carrying capacity of nonmetal optical cable

Abstract

The invention discloses an early warning system and early warning method for the current-carrying capacity of a non-metal optical cable, and relates to the field of power equipment, and the system comprises an optical fiber temperature measurement host, a non-metal armored optical cable, current-carrying capacity calculation equipment, a winch drum, an optical fiber connector and an alarm device. The optical fiber temperature measurement host is used for acquiring temperature data of the nonmetal armored optical cable and transmitting the temperature data to the current-carrying capacity calculation equipment; the current-carrying capacity calculation equipment is used for determining the actual current-carrying capacity of the nonmetal armored optical cable according to the temperature data; establishing an optical cable structure model; performing parameter configuration, grid division and boundary condition configuration on the optical cable structure model; applying current to the configured optical cable structure model, and determining a target temperature field result of the optical cable structure model corresponding to the critical temperature value; determining theoretical current-carrying capacity according to a target temperature field result; when the actual current-carrying capacity is greater than the theoretical current-carrying capacity, the alarm device gives an alarm. The current-carrying capacity can be accurately pre-warned, and safe operation of equipment is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of power equipment, and in particular to an early warning system and method for the current carrying capacity of a non-metallic optical cable. Background Art

[0002] With the rapid development of power equipment, non-metallic optical cables are widely used in a variety of scenarios, such as deep-sea scientific research, urban underground integrated pipeline corridors, and chemical plants, due to their significant advantages, including light weight, good flexibility, resistance to electromagnetic interference, and corrosion resistance. In the field of deep-sea exploration, non-metallic armored optical cables serve as the core transmission medium connecting scientific research winches and cabled unmanned underwater vehicles (ROVs). Their multi-layer composite structure not only ensures lossless signal transmission, but also avoids the risk of electrochemical corrosion of metal armor in the high-pressure deep-sea environment through non-metallic materials. However, as deep-sea exploration missions increase their reliance on high-power equipment (such as deep-sea hydrothermal samplers and high-definition camera systems), the current carrying capacity requirements of optical cables have risen from tens of amperes in the early days to hundreds of amperes. The resulting temperature effects have become a key bottleneck restricting system stability. Therefore, to ensure the safe and efficient operation of cables, it is crucial to have early warning of the current carrying capacity of non-metallic optical cables.

[0003] Currently, the relevant technology generally uses the IEC 60287 international standard to calculate the current-carrying capacity of non-metallic armored optical cables. However, when the non-metallic armored optical cable is wound in multiple layers on the winch drum, this solution cannot determine the current-carrying capacity of the non-metallic armored optical cable, resulting in poor accuracy in the current-carrying capacity warning. Summary of the Invention

[0004] The purpose of this application is to provide an early warning system and early warning method for the current carrying capacity of non-metallic optical cables.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides an early warning system for current carrying capacity of non-metallic optical cables, comprising:

[0007] The non-metallic optical cable current carrying capacity warning system includes: an optical fiber temperature measurement host, a non-metallic armored optical cable, a current carrying capacity calculation device, a winch drum, an optical fiber connector, and an alarm device; the non-metallic armored optical cable is wound on the winch drum, the current carrying capacity calculation device is electrically connected to the optical fiber temperature measurement host and the alarm device respectively, and the optical fiber temperature measurement host is also connected to the non-metallic armored optical cable via the optical fiber connector;

[0008] The optical fiber temperature measurement host is used to: obtain the temperature data of the non-metallic armored optical cable and transmit it to the current carrying capacity calculation device;

[0009] The current-carrying capacity calculation device is used to: determine the actual current-carrying capacity of the non-metallic armored optical cable based on the temperature data; establish an optical cable structure model corresponding to the non-metallic armored optical cable; perform parameter configuration, grid division, and boundary condition configuration on the optical cable structure model; apply current to the configured optical cable structure model to determine the target temperature field result of the optical cable structure model corresponding to the critical temperature value; determine the theoretical current-carrying capacity of the non-metallic armored optical cable based on the target temperature field result; and when the actual current-carrying capacity is greater than the theoretical current-carrying capacity, issue an alarm through the alarm device.

[0010] Optionally, the current carrying capacity calculation device includes: a data acquisition module and a current carrying capacity calculation module;

[0011] The data acquisition module is used to: receive temperature data sent by the optical fiber temperature measurement host;

[0012] The current-carrying capacity calculation module is used to: determine the actual current-carrying capacity of the non-metallic armored optical cable based on the temperature data; perform finite element analysis on the non-metallic armored optical cable to establish an optical cable structure model corresponding to the non-metallic armored optical cable; configure parameters of component elements in the optical cable structure model; perform physical field coupling, meshing processing, and boundary condition configuration on the optical cable structure model; apply current to the configured optical cable structure model to determine the target temperature field result of the optical cable structure model corresponding to the critical temperature value; and determine the theoretical current-carrying capacity of the non-metallic armored optical cable based on the target temperature field result.

[0013] Optionally, the current carrying capacity calculation module is further used to:

[0014] Determining, based on the temperature distribution characteristics, key areas and other areas in the optical cable structure model; the key areas are areas in the optical cable structure model where the temperature gradient is greater than a preset threshold, and the other areas are areas in the optical cable structure model other than the key areas;

[0015] The key area is divided into a first grid, and the other areas are divided into a second grid; the density of the first grid is smaller than that of the second grid.

[0016] Optionally, the current carrying capacity calculation module is further used to:

[0017] Applying current to the configured optical cable structure model to obtain temperature field results at various positions in the component elements;

[0018] When the maximum temperature value in the temperature field result reaches the critical temperature value, the temperature field result is used as the target temperature field result.

[0019] Optionally, the current carrying capacity calculation module is further used to:

[0020] Determining the spatial coordinates of each position point on the cross section of the optical cable structure model;

[0021] Heat conduction calculation processing is performed according to the spatial coordinates of each position point and the configured parameters of the component elements to obtain temperature field results of each position point.

[0022] Optionally, the current carrying capacity calculation module is further used to:

[0023] When the actual current-carrying capacity is greater than the theoretical current-carrying capacity, an alarm prompt instruction is generated and sent to the alarm device, so that the alarm device responds to the alarm prompt instruction and issues an alarm.

[0024] Optionally, the alarm device includes: a receiving module, a sending module and an alarm module;

[0025] The receiving module is used to: receive the alarm prompt instruction, generate an alarm signal and send it to the alarm module;

[0026] The alarm module is configured to: in response to the alarm signal, execute an alarm operation and generate a load adjustment instruction and send it to the sending module.

[0027] The sending module is used to send the load adjustment instruction to the external load, so as to reduce the actual current carrying capacity by adjusting the external load.

[0028] Optionally, the optical fiber temperature measurement host includes: a pulse laser and a processing module connected to the pulse laser;

[0029] The pulse laser is used to: emit laser pulses and inject them into the multimode optical fiber in the non-metallic armored optical cable through the optical fiber connector; receive the temperature-carrying Raman scattered light signal reflected by the multimode optical fiber and send it to the processing module.

[0030] The processing module is used to analyze the Raman scattered light signal, obtain temperature data of the non-metallic armored optical cable, and transmit the temperature data to the current carrying capacity calculation device.

[0031] Optionally, the component elements include at least one of the following: a conductor, an insulator, an optical fiber, a steel pipe, a filler, a metal shielding layer, an inner sheath, a non-metallic armor, and an outer sheath.

[0032] In a second aspect, the present application provides an early warning method for current carrying capacity of a non-metallic optical cable, comprising:

[0033] Acquiring temperature data of a non-metallic armored optical cable, and determining an actual current carrying capacity of the non-metallic armored optical cable based on the temperature data;

[0034] Establishing an optical cable structure model corresponding to the non-metallic armored optical cable, and performing parameter configuration, mesh division, and boundary condition configuration on the optical cable structure model;

[0035] Applying current to the configured optical cable structure model to determine the target temperature field result of the optical cable structure model corresponding to the critical temperature value;

[0036] Determining the theoretical current carrying capacity of the non-metallic armored optical cable according to the target temperature field result;

[0037] When the actual current-carrying capacity is greater than the theoretical current-carrying capacity, an alarm is issued through the alarm device.

[0038] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0039] The present application provides an early warning system and early warning method for the current carrying capacity of a non-metallic optical cable, the system comprising: an optical fiber temperature measurement host, a non-metallic armored optical cable, a current carrying capacity calculation device, a winch drum and an alarm device; the non-metallic armored optical cable is wound on the winch drum, the current carrying capacity calculation device is electrically connected to the optical fiber temperature measurement host and the alarm device respectively, and the optical fiber temperature measurement host is also connected to the non-metallic armored optical cable through an optical fiber connector; the optical fiber temperature measurement host is used to: obtain temperature data of the non-metallic armored optical cable and transmit it to the current carrying capacity calculation device; the current carrying capacity calculation device is used to: determine the actual current carrying capacity of the non-metallic armored optical cable based on the temperature data; establish an optical cable structure model corresponding to the non-metallic armored optical cable; configure parameters, mesh division, and boundary conditions of the optical cable structure model; apply current to the optical cable structure model to determine the target temperature field result of the optical cable structure model corresponding to the critical temperature value; determine the theoretical current carrying capacity of the non-metallic armored optical cable based on the target temperature field result; and when the actual current carrying capacity is greater than the theoretical current carrying capacity, an alarm is issued through the alarm device. Compared with the existing technology, this system uses an optical fiber temperature measurement host to obtain the temperature data of the non-metallic armored optical cable, and combines it with the current carrying capacity calculation equipment to determine the actual current carrying capacity. By establishing an optical cable structure model corresponding to the non-metallic armored optical cable, and configuring the parameters, grid division, and boundary conditions of the model, the model is more in line with the actual cable situation, and can accurately determine the current carrying capacity of non-metallic armored optical cables wound on the winch drum in multiple layers, breaking through the limitations of traditional solutions; and comparing the actual and theoretical current carrying capacities for early warning judgment, changing the previous situation where the early warning deviation was large due to the inability to accurately determine the current carrying capacity, significantly improving the accuracy of the current carrying capacity warning, and timely and accurate current carrying capacity warning through the alarm device, allowing relevant personnel to discover abnormal current carrying capacity of the optical cable in advance, avoid failures caused by excessive current carrying capacity, ensure the safe and stable operation of the optical cable under the multi-layer winding condition of the winch drum, and reduce the probability of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 This is a schematic diagram of the warning structure of the current carrying capacity of the non-metallic optical cable in one embodiment of the present application;

[0042] Figure 2 A schematic diagram of the physical structure of a non-metallic optical cable current carrying capacity warning system provided in one embodiment of the present application;

[0043] Figure 3A schematic structural diagram of a non-metallic optical cable current carrying capacity warning system provided in another embodiment of the present application;

[0044] Figure 4 A schematic structural diagram of an optical cable structure model corresponding to the current carrying capacity of a non-metallic optical cable provided in an embodiment of the present application;

[0045] Figure 5 A temperature distribution diagram of a single non-metallic armored optical cable provided in one embodiment of the present application;

[0046] Figure 6 A temperature distribution diagram of a multi-layer wound non-metallic armored optical cable provided in one embodiment of the present application;

[0047] Figure 7 A schematic flow chart of a method for early warning of the current carrying capacity of a non-metallic optical cable provided in one embodiment of the present application;

[0048] Figure 8 A schematic flow chart of a method for early warning of the current carrying capacity of a non-metallic optical cable provided in another embodiment of the present application;

[0049] Figure 9 A schematic diagram of the internal structure of a current carrying capacity calculation device provided in one embodiment of the present application;

[0050] Description of reference numerals:

[0051] Fiber optic temperature measurement host-10; non-metallic armored optical cable-20; conductor-21; insulator-22; filler-23; optical fiber-24; steel pipe-25; metal shielding layer-26; inner sheath-27; non-metallic armor layer-28; outer sheath-29; current carrying capacity calculation device-30; data acquisition module-31; current carrying capacity calculation module-32; winch drum-40; optical fiber connector-50; alarm device-60; receiving module-61; transmitting module-62; alarm module-63. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0054] As mentioned in the background technology, the relevant technology generally uses the IEC 60287 international standard to calculate the current-carrying capacity of non-metallic armored optical cables. However, when the non-metallic armored optical cables are wound in multiple layers on the winch drum, this solution cannot determine the current-carrying capacity of the non-metallic armored optical cables, resulting in poor accuracy in the current-carrying capacity warning.

[0055] Based on the above-mentioned defects, an embodiment of the present application provides an early warning system and method for the current carrying capacity of non-metallic optical cables. Compared with the existing technology, the system uses an optical fiber temperature measurement host to obtain the temperature data of the non-metallic armored optical cable, and determines the actual current carrying capacity in combination with the current carrying capacity calculation equipment. By establishing an optical cable structure model corresponding to the non-metallic armored optical cable, and configuring the parameters, grid division, and boundary conditions of the model, the model is made more in line with the actual cable situation, and can accurately determine the current carrying capacity of the non-metallic armored optical cable wound on the winch drum in multiple layers, breaking through the limitations of the traditional solution; and comparing the actual and theoretical current carrying capacities for early warning judgment, changing the previous situation where the early warning deviation was large due to the inability to accurately determine the current carrying capacity, significantly improving the accuracy of the current carrying capacity early warning, and timely and accurate current carrying capacity early warning through the alarm device, allowing relevant personnel to discover abnormal current carrying capacity of the optical cable in advance, avoid failures caused by excessive current carrying capacity, ensure the safe and stable operation of the optical cable under the multi-layer winding condition of the winch drum, and reduce the probability of accidents.

[0056] See Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the structure of the early warning system for the current carrying capacity of non-metallic optical cables provided in an embodiment of the present application. Figure 2 A schematic diagram of the physical structure of the non-metallic optical cable current-carrying capacity warning system provided in an embodiment of the present application, the non-metallic optical cable current-carrying capacity warning system includes: an optical fiber temperature measurement host 10, a non-metallic armored optical cable 20, a current-carrying capacity calculation device 30, a winch drum 40, an optical fiber connector 50 and an alarm device 60; the non-metallic armored optical cable 20 is wound on the winch drum 40, the current-carrying capacity calculation device 30 is electrically connected to the optical fiber temperature measurement host 10 and the alarm device 60, respectively, and the optical fiber temperature measurement host 10 is also connected to the non-metallic armored optical cable 20 through the optical fiber connector 50.

[0057] The optical fiber temperature measurement host 10 is used to: obtain the temperature data of the non-metallic armored optical cable 20 and transmit it to the current carrying capacity calculation device 30; the current carrying capacity calculation device 30 is used to: determine the actual current carrying capacity of the non-metallic armored optical cable 20 based on the temperature data; establish an optical cable structure model corresponding to the non-metallic armored optical cable 20; configure parameters, mesh division, and boundary conditions of the optical cable structure model; apply current to the configured optical cable structure model to determine the target temperature field result of the optical cable structure model corresponding to the critical temperature value; determine the theoretical current carrying capacity of the non-metallic armored optical cable based on the target temperature field result; when the actual current carrying capacity is greater than the theoretical current carrying capacity, an alarm is issued through the alarm device.

[0058] It should be noted that the above-mentioned non-metallic armored optical cable 20 may include a cable core, an insulation layer, a non-metallic armor layer, an outer sheath, etc. The cable core usually contains optical fibers or wires, which are used to transmit optical signals or electrical signals. Optical fibers have the characteristics of high bandwidth, low loss, and anti-interference, and can achieve high-speed and long-distance signal transmission; wires are used to transmit electrical energy or electrical signals, and their materials and specifications vary according to different usage requirements. The insulation layer is wrapped around the cable core, which plays the role of electrical insulation to prevent signal leakage or short circuit, and also protects the cable core from the influence of the external environment.

[0059] The non-metallic armor layer is made of non-metallic materials such as fiberglass, aramid fiber, and polyester tape. It enhances the cable's mechanical strength and abrasion resistance, protecting the cable core and insulation from external forces such as stretching, squeezing, and puncture. It also offers excellent corrosion resistance and electromagnetic interference resistance, making it suitable for harsh operating environments. The outer sheath, located at the outermost layer of the optical cable, primarily protects the cable from environmental damage such as moisture, UV rays, and chemicals. It is typically constructed of weather-resistant materials such as polyolefin and chloroprene rubber, extending the cable's service life.

[0060] Optionally, the optical fiber temperature measurement host may be a distributed optical fiber temperature measurement host, which includes: a pulse laser and a processing module connected to the pulse laser.

[0061] The pulsed laser emits laser pulses and injects them into the multimode optical fiber of the non-metallic armored optical cable through the optical fiber connector. It then receives the Raman scattered light signal, which carries the temperature, reflected from the multimode optical fiber and transmits it to the processing module. The processing module analyzes the Raman scattered light signal, obtains the temperature data of the non-metallic armored optical cable, and transmits it to the current-carrying capacity calculation device.

[0062] The pulsed laser emits laser pulses that pass through a fiber optic connector and into the multimode optical fiber within a non-metallic armored optical cable. Leveraging the optical transmission properties of the fiber, the laser pulses penetrate deep into the cable. As they propagate along the multimode fiber, they interact with the fiber's molecules, generating Raman scattering. The pulsed laser's highly sensitive detector captures the faint reflected Raman scattered light signal. High-speed optoelectronic conversion circuits convert the optical signal into an electrical signal, which is then transmitted via differential transmission to the processing module.

[0063] The processing module may be integrated with a digital signal processing chip. The processing module may suppress noise on the input signal using a bandpass filter bank, filtering out environmental electromagnetic interference and Rayleigh scattering noise introduced by optical fiber transmission, and calculate real-time temperature data for each location along the non-metallic armored optical cable.

[0064] Optionally, this processing module also features data caching and preprocessing, packaging temperature data into time series and transmitting it in real time to a current-carrying capacity calculation device via an industrial Ethernet interface (supporting Modbus TCP / IP protocol), providing high-precision temperature data for subsequent current-carrying capacity analysis. The entire temperature measurement process can respond in less than 1 second, with a temperature measurement accuracy of ±0.5°C, meeting the real-time and accuracy requirements of dynamic current-carrying capacity monitoring.

[0065] The current capacity calculation device 30 has data processing capabilities and can be, but is not limited to, various terminal devices or servers. Terminal devices may include desktop computers, laptops, smartphones, tablets, IoT devices, and portable wearable devices. IoT devices may include smart speakers, smart TVs, smart air conditioners, and smart car devices. Portable wearable devices may include smart watches, smart bracelets, and head-mounted devices. The server may be a single server, a server cluster, or a cloud server.

[0066] The above-mentioned non-metallic armored optical cable current carrying capacity warning system also includes a current source and an external load. The non-metallic armored optical cable is connected to the current source and the external load respectively. The current is connected to the non-metallic armored optical cable through the current source, and the temperature of the non-metallic armored optical cable is measured by the optical fiber temperature measurement host. The temperature data is obtained and sent to the current carrying capacity calculation device, so that the current carrying capacity calculation device calculates the actual current carrying capacity of the non-metallic armored optical cable based on the temperature data.

[0067] In one embodiment, see Figure 3 As shown, the current carrying capacity calculation device 30 includes a data acquisition module 31 and a current carrying capacity calculation module 32. The data acquisition module 31 is electrically connected to the current carrying capacity calculation module 32.

[0068] The data acquisition module 31 is used to: receive temperature data sent by the optical fiber temperature measurement host; the current carrying capacity calculation module 32 is used to: determine the actual current carrying capacity of the non-metallic armored optical cable based on the temperature data; perform finite element analysis on the non-metallic armored optical cable, and establish an optical cable structure model corresponding to the non-metallic armored optical cable; configure parameters of component elements in the optical cable structure model; perform physical field coupling, meshing processing and boundary condition configuration on the optical cable structure model; apply current to the configured optical cable structure model to determine the target temperature field result of the optical cable structure model corresponding to the critical temperature value; and determine the theoretical current carrying capacity of the non-metallic armored optical cable based on the target temperature field result.

[0069] Specifically, the current carrying capacity calculation device can be built-in with finite element simulation software. The current carrying capacity calculation module can obtain the actual structure of the non-metallic armored optical cable, and run the finite element simulation software to establish the optical cable structure model corresponding to the non-metallic armored optical cable through the finite element analysis method. The optical cable structure model can be found in Figure 4 As shown. The finite element simulation software may be, for example, COMSOL Multiphysics. The optical cable structure model includes multiple component elements, each of which includes at least one of the following: a conductor 21, an insulator 22, an optical fiber 24, a steel tube 25, a filler 23, a metal shield 26, an inner sheath 27, a non-metallic armor layer 28, and an outer sheath 29.

[0070] After obtaining the optical cable structure model, material parameters can be selected and set for some component elements of the model from the software material library. The user clicks the material parameter option and enters or selects the corresponding material parameters, so that the current-carrying capacity calculation device responds to the parameter configuration instructions input by the user and configures the material parameters of the component elements in the optical cable structure model. The material parameters may include: thermal conductivity, thermal conductivity coefficient, electrical conductivity, density, constant pressure heat capacity, convection heat transfer coefficient, etc.

[0071] It's important to note that after configuring the optical cable structure model's parameters, the model undergoes multi-physics coupling and meshing. Because optical cable operation involves the interaction of multiple physical fields, such as electricity and heat, multi-physics coupling is necessary to accurately simulate the actual conditions of non-metallic armored optical cables. Meshing also discretizes the continuous physical model to facilitate numerical calculations in the current-carrying calculation module.

[0072] When non-metallic armored optical cables are energized, the current flowing through the conductor generates Joule heating, a phenomenon known as the coupling of electric and thermal fields. Heat is conducted within the optical cable while also undergoing convection with the external environment, a phenomenon known as the coupling of conduction and convection.

[0073] In this embodiment, in the finite element simulation software, corresponding physical field interfaces can be added based on the physical process of the non-metallic armored optical cable. The "current" interface is used to simulate the electric field, and the "heat conduction" interface is used to simulate the thermal field. Then, in each physical field interface, the parameters of the physical field are set according to the material parameters set above. And the coupling relationship between different physical fields is clarified. For example, the Joule heat calculated in the "current" interface will be input into the "heat conduction" interface as a heat source term. And the optical cable structure model is meshed and discretized into a finite number of small units. Then, boundary conditions are set for the optical cable structure model based on the convective heat transfer coefficient and thermal conductivity. The boundary condition can be a convective heat transfer condition on the boundary, which can be expressed by the following formula:

[0074]

[0075] in, is the temperature gradient in the normal direction of the boundary; h is the convective heat transfer coefficient, in W / m 2 K; T ∞ is the fluid temperature in °C, λ is the thermal conductivity of the material, in W / m·K.

[0076] It's important to note that the convection heat transfer condition at the boundary is crucial for describing the heat exchange between the optical cable and the external environment, affecting the temperature distribution within the cable. By setting boundary conditions, the optical cable structure model can be made more consistent with the actual physical environment, resulting in more accurate calculation results.

[0077] In this embodiment, by establishing an optical cable structure model, the physical structure composition of the optical cable can be clarified, providing a specific model framework for subsequent calculations. By configuring the parameters of the optical cable structure model, the behavioral characteristics of each part of the optical cable in the physical process can be characterized, which is convenient for the subsequent temperature field calculation; and the multi-physical field coupling setting is used to accurately simulate the interaction between multiple physical fields such as electricity and heat during the actual operation of non-metallic armored optical cables, and by meshing the optical cable structure model, the current carrying capacity calculation module can accurately calculate the temperature field value.

[0078] After building the optical cable structure model, setting parameters, meshing, and boundary conditions, you need to apply current to the configured optical cable structure model. Current passing through non-metallic armored optical cables generates Joule heating, which is the main cause of cable heating. At this point, the temperature field of the wound cable is calculated and analyzed, taking into account the heat generated by conductor loss, insulation loss, and metal shielding loss to determine the temperature field results of the non-metallic armored optical cable when it is powered. This temperature field result is used to represent the temperature conditions at various locations in the optical cable structure model at a specific moment in time.

[0079] In the process of applying current to the optical cable structure model, the temperature field result is obtained. When the maximum temperature value in the temperature field result reaches the critical temperature value, the temperature field result is used as the target temperature field result. At this time, the current applied to the optical cable structure model when obtaining the target temperature field result is the theoretical current carrying capacity of the non-metallic armored optical cable, which may include the theoretical current carrying capacity of multi-layer wound non-metallic armored optical cables. Among them, the current carrying capacity refers to the current that the cable can continuously carry under specified conditions without causing its temperature to exceed the specified value. The above critical temperature value is customized according to actual needs, for example, it can be 90°C or 80°C. The temperature field results can be participated in Figure 5 and Figure 6 As shown, Figure 5 The temperature distribution diagram of a single non-metallic armored optical cable provided in the embodiment of this application is as follows: Figure 6 This is a temperature distribution diagram of the multi-layer wound non-metallic armored optical cable provided in an embodiment of the present application.

[0080] The present application provides an early warning system for the current carrying capacity of a non-metallic optical cable, comprising: an optical fiber temperature measuring host, a non-metallic armored optical cable, a current carrying capacity calculating device, a winch drum and an alarm device; the non-metallic armored optical cable is wound on the winch drum, the current carrying capacity calculating device is electrically connected to the optical fiber temperature measuring host and the alarm device respectively, and the optical fiber temperature measuring host is also connected to the non-metallic armored optical cable through an optical fiber connector; the optical fiber temperature measuring host is used to: obtain temperature data of the non-metallic armored optical cable and transmit it to the current carrying capacity calculating device; the current carrying capacity calculating device is used to: determine the actual current carrying capacity of the non-metallic armored optical cable based on the temperature data; establish an optical cable structure model corresponding to the non-metallic armored optical cable; perform parameter configuration, grid division, and boundary condition configuration on the optical cable structure model; apply current to the optical cable structure model to determine the target temperature field result of the optical cable structure model corresponding to the critical temperature value; determine the theoretical current carrying capacity of the non-metallic armored optical cable based on the target temperature field result; and when the actual current carrying capacity is greater than the theoretical current carrying capacity, an alarm is issued through the alarm device. Compared with the existing technology, this system uses an optical fiber temperature measurement host to obtain the temperature data of the non-metallic armored optical cable, and combines it with the current carrying capacity calculation equipment to determine the actual current carrying capacity. By establishing an optical cable structure model corresponding to the non-metallic armored optical cable, and configuring the parameters, grid division, and boundary conditions of the model, the model is more in line with the actual cable situation, and can accurately determine the current carrying capacity of non-metallic armored optical cables wound on the winch drum in multiple layers, breaking through the limitations of traditional solutions; and comparing the actual and theoretical current carrying capacities for early warning judgment, changing the previous situation where the early warning deviation was large due to the inability to accurately determine the current carrying capacity, significantly improving the accuracy of the current carrying capacity warning, and timely and accurate current carrying capacity warning through the alarm device, allowing relevant personnel to discover abnormal current carrying capacity of the optical cable in advance, avoid failures caused by excessive current carrying capacity, ensure the safe and stable operation of the optical cable under the multi-layer winding condition of the winch drum, and reduce the probability of accidents.

[0081] In one embodiment, the current carrying capacity calculation module is further configured to:

[0082] According to the temperature distribution characteristics, the key areas and other areas in the optical cable structure model are determined; the key areas are areas in the optical cable structure model where the temperature gradient is greater than a preset threshold, and the other areas are areas in the optical cable structure model other than the key areas; the key areas are divided into a first grid, and the other areas are divided into a second grid; the density of the first grid is less than that of the second grid.

[0083] It's understandable that the optical cable structure model includes different regions with varying temperature gradients, including key regions with large temperature gradients and other regions with smaller temperature gradients. Key regions, where temperature changes are dramatic, require a denser first mesh. Other regions with smaller temperature gradients require less computational accuracy and a sparser second mesh.

[0084] The physical characteristics of different regions may vary. Critical regions, due to large temperature fluctuations, may have a more significant impact on the performance and safety of optical cables, requiring a more detailed study of their physical processes. Other regions, on the other hand, are relatively stable. Using a sparser mesh can better highlight the importance of critical regions while reflecting the overall characteristics, making the model more consistent with the actual physical behavior of optical cables. Fine meshing of critical regions can more accurately handle the boundary conditions and complex physical phenomena in those regions, helping to achieve stable calculation results more quickly. For the remaining sparse meshing, over-refinement will not result in an excessive number of unnecessary computational nodes, thereby improving the computational efficiency and stability of the entire model.

[0085] Specifically, during the meshing process of the optical cable structure model, a global mesh is first set for the entire optical cable structure model using a mesh model and mesh size. This mesh model can, for example, be a free tetrahedral mesh. Based on the temperature distribution characteristics, key regions of the optical cable structure model where the temperature gradient exceeds a preset threshold and other regions other than the key regions are determined. For example, the key region can be the junction of the conductor and the insulation layer in the optical cable structure model. The key region is then adjusted to a denser first mesh, while the meshes of other regions are adjusted to a sparser second mesh. The first mesh is denser than the second mesh.

[0086] In this embodiment, by using a denser first grid for key areas with large temperature gradients, subtle temperature variations within these areas and complex physical processes within the optical cable, such as current density distribution and heat conduction, can be more accurately captured. This helps to more accurately calculate the performance parameters of the optical cable in these key areas, avoiding distortion of the calculation results caused by overly coarse grids, thereby improving the overall accuracy of the current carrying capacity calculation. Furthermore, using a second grid for other areas with smaller temperature gradients can reduce the amount of calculation and calculation time, while ensuring that the calculation results meet certain accuracy requirements, reducing calculation costs and further improving calculation efficiency.

[0087] In one embodiment, the current carrying capacity calculation module is further configured to:

[0088] Apply current to the configured optical cable structure model to obtain the temperature field results of each position point in the component element; when the maximum temperature value in the temperature field result is the critical temperature value, the temperature field result is used as the target temperature field result.

[0089] It's important to note that when current passes through the optical cable structure model, the cable's resistance generates Joule heating, causing the cable temperature to rise. During the application of current, the magnitude and direction of the current must be precisely controlled to simulate the current flow under actual operating conditions. The critical temperature values ​​mentioned above are important indicators for ensuring the proper functioning and safe operation of non-metallic armored optical cables.

[0090] After applying current to the optical cable structure model, numerical calculation methods can be used to divide the optical cable structure model into multiple tiny units. By analyzing the heat transfer process of each unit, the temperature field results of each position point in the component element are calculated. This numerical calculation method can be, for example, finite element analysis method, finite difference method, etc.

[0091] After meshing the optical cable structure model, when applying current to the model, you can establish the equations for the current and electric field relationship between each unit based on basic electromagnetic principles such as Maxwell's equations and Ohm's law. You can also set up a current source, specify its direction, and then connect the current source to the corresponding endpoints of the optical cable structure model to apply current to the model.

[0092] Among them, in the process of applying current to the optical cable structure model, the temperature field results of each position point can be continuously obtained. When the maximum temperature value in the temperature field result reaches the critical temperature value, the temperature field result at this time is used as the target temperature field result, and then the theoretical current carrying capacity of the non-metallic armored optical cable is determined according to the target temperature field result.

[0093] In this embodiment, an optical fiber temperature measurement method is adopted. The actual current-carrying capacity of the non-metallic armored optical cable is calculated based on the temperature data measured by the multimode optical fiber inside the non-metallic armored optical cable. Finite element numerical calculation is adopted to accurately determine the theoretical current-carrying capacity of the multi-layer non-metallic armored optical cable wound on the winch, which solves the problem that the current-carrying capacity of the non-metallic armored optical cable wound on the winch cannot be calculated in the existing international standards.

[0094] Optionally, the current carrying capacity calculation module is further used to:

[0095] Determine the spatial coordinates of each position point on the cross section of the optical cable structure model; perform heat conduction calculation based on the spatial coordinates of each position point and the parameters of the configured component elements to obtain the temperature field results of each position point.

[0096] Specifically, after constructing the optical cable structure model, the cross section of the optical cable structure model is determined, and the spatial coordinates of each position point on the cross section are obtained. Then, heat conduction calculation processing is performed based on the spatial coordinates of each position point and the configured volume heat source intensity and thermal conductivity to obtain the temperature field results of each position point, which can be expressed by the following formula:

[0097]

[0098] Where T is the temperature field result, in °C; x and y are the spatial coordinates of each position point in the cross section of the optical cable structure model; q v is the volumetric heat source intensity, in W / m 3 ; λ is the thermal conductivity of the material, in W / m·K.

[0099] The current-carrying capacity calculation module in this embodiment can accurately determine the temperature field results of each position point by determining the spatial coordinates of each position point on the cross-section of the optical cable structure model and performing heat conduction calculations based on the spatial coordinates and the parameters of the component elements, thereby facilitating timely understanding of the temperature distribution of the optical cable at different position points. The temperature field results can reveal the parts of the optical cable structure that are prone to overheating, which helps to improve the overall thermal performance and reliability during the optimization stage; and by applying current and monitoring the temperature field results, the theoretical current-carrying capacity of the optical cable under specific conditions is accurately determined when the critical temperature value is reached, which is convenient for comparison with the actual current-carrying capacity and timely early warning of the current-carrying capacity.

[0100] In one embodiment, the current carrying capacity calculation module is further configured to:

[0101] When the actual current-carrying capacity is greater than the theoretical current-carrying capacity, an alarm prompt instruction is generated and sent to the alarm device, so that the alarm device responds to the alarm prompt instruction and issues an alarm.

[0102] It can be understood that actual current carrying capacity refers to the current value that a non-metallic optical cable can carry in real time in an actual operating environment. Theoretical current carrying capacity refers to the maximum current that an optical cable can carry under ideal conditions, calculated through theoretical calculations based on the cable's material characteristics, structural parameters, and relevant thermal and electrical principles.

[0103] In this embodiment, after obtaining the actual current carrying capacity and the theoretical current carrying capacity, the current carrying capacity calculation device can compare the actual current carrying capacity with the theoretical current carrying capacity to determine whether the actual current carrying capacity is greater than the theoretical current carrying capacity. When the actual current carrying capacity is greater than the theoretical current carrying capacity, it indicates that the non-metallic armored optical cable has reached the maximum safe operating current, that is, the optical cable has reached the temperature limit it can withstand under the current operating conditions, and an alarm device needs to be used for early warning, and an alarm prompt instruction is generated and sent to the alarm device. When the actual current carrying capacity is not greater than the theoretical current carrying capacity, it indicates that the non-metallic armored optical cable has not reached the maximum safe operating current and is in a safe operating state, and no processing is required.

[0104] The alarm device comprises a receiving module, a sending module and an alarm module;

[0105] The receiving module is used to: receive alarm prompt instructions, generate an alarm signal and send it to the alarm module; the alarm module is used to: respond to the alarm signal, perform an alarm operation and generate a load adjustment instruction and send it to the sending module; the sending module is used to: send a load adjustment instruction to the external load to reduce the actual current carrying capacity by adjusting the external load.

[0106] The alarm module may be a buzzer or a display. Upon receiving the alarm prompt instruction, the receiving module in the alarm device generates an alarm signal and sends it to the alarm module, causing the alarm module to sound an alarm. For example, the alarm may be sounded by a buzzer or displayed on a display.

[0107] The above-mentioned non-metallic armored optical cable can be connected to an external load. After an alarm is issued, a load adjustment instruction can be generated and sent to the external load, so that the external load adjusts the operating power, operating time or connection method, thereby reducing the actual current carrying capacity.

[0108] When the actual current carrying capacity of the alarm device in this embodiment is greater than the theoretical current carrying capacity, an alarm prompt instruction is generated and sent to the alarm device, so that the alarm device responds to the alarm prompt instruction and can promptly remind the staff that the optical cable is in an overloaded or potentially overloaded state, thereby preventing the optical cable from aging and damaging the insulation material due to long-term overload heating, extending the service life of the optical cable, and preventing signal transmission interruption or equipment failure caused by damage to the optical cable. This helps to avoid safety accidents such as fire caused by overheating of the optical cable, protect the lives and property of people, maintain the stable operation of the entire power or communication system, and reduce losses such as production stagnation and business interruption caused by system failures. In addition, through alarm feedback, the staff can be prompted to optimize the system's load distribution and the use of optical cables, reasonably adjust the equipment operation mode and load distribution, and improve the overall operating efficiency and reliability of the system.

[0109] In an exemplary embodiment, Figure 7 As shown, a non-metallic optical cable current carrying capacity warning method is provided, which is executed by a current carrying capacity calculation device, and specifically can be executed separately by a current carrying capacity calculation device such as a server. In the embodiment of the present application, the following steps 201 to 204 are included. Among them:

[0110] Step 201: Acquire temperature data of a non-metallic armored optical cable, and determine an actual current carrying capacity of the non-metallic armored optical cable according to the temperature data.

[0111] Step 202: Establish an optical cable structure model corresponding to the non-metallic armored optical cable, and perform parameter configuration, mesh division, and boundary condition configuration on the optical cable structure model.

[0112] Step 203: applying current to the configured optical cable structure model to determine a target temperature field result of the optical cable structure model corresponding to a critical temperature value.

[0113] Step 204: Determine the theoretical current carrying capacity of the non-metallic armored optical cable according to the target temperature field result.

[0114] Step 205: When the actual current carrying capacity is greater than the theoretical current carrying capacity, an alarm is issued through the alarm device.

[0115] The aforementioned non-metallic optical cable current-carrying capacity early warning system includes a fiber optic temperature measurement host, a current-carrying capacity calculation device, an alarm device, a non-metallic armored optical cable, and a winch drum around which the non-metallic armored optical cable is wound. The system may also include a current source and an external load, with the non-metallic armored optical cable connected to the current source and external load, respectively. The current source applies current to the non-metallic armored optical cable, and the fiber optic temperature measurement host emits laser pulses into the non-metallic optical cable to acquire temperature data in real time. The current applied based on the temperature data is used as the actual current-carrying capacity of the non-metallic armored optical cable.

[0116] Specifically, the finite element simulation software is run in the above-mentioned current carrying capacity calculation device. Figure 8 As shown in the figure, by calling the finite element simulation software, an optical cable structure model corresponding to a non-metallic armored optical cable is established. The optical cable structure model includes multiple component elements, namely: conductor, insulator, optical fiber, steel pipe, filler, metal shielding layer, inner sheath, non-metallic armor layer, and outer sheath.

[0117] Users use the material parameter options in the finite element simulation software to select and set material parameters for the optical cable structure model, such as thermal conductivity, electrical conductivity, density, and constant-pressure heat capacity. They then configure multi-physics coupling for the optical cable structure model and perform meshing. Key areas with large temperature gradients within the optical cable structure model are meshed using a denser first mesh, while other areas with smaller temperature gradients are meshed using a sparser second mesh. Convective heat transfer conditions are also set on the boundaries of the optical cable structure model.

[0118] Once the conditions are set, current is applied to the configured optical cable structure model, generating Joule heating. The temperature field of the wound cable is continuously calculated and analyzed, yielding temperature field results until the cable's maximum temperature reaches the critical value of 90°C. The current value applied at this point represents the theoretical current capacity under this operating condition. In practice, an iterative approach can be employed, starting with a small current value and increasing it incrementally. The temperature field results are then calculated to determine whether they reach the critical value of 90°C. If not, the current is increased again until the conditions are met.

[0119] It is understood that determining the theoretical current carrying capacity corresponding to the critical temperature value of the cable in this embodiment is crucial for the safe operation of the cable. If the actual operating current (actual current carrying capacity) exceeds the theoretical current carrying capacity, the temperature of the optical cable will continue to rise, potentially accelerating the aging of the insulation material, degrading insulation performance, and even causing safety accidents such as fire. Therefore, accurately calculating the current carrying capacity of the cable provides an important basis for cable selection, operation management, and other aspects.

[0120] After obtaining the theoretical current-carrying capacity, the actual current-carrying capacity is compared with the theoretical current-carrying capacity to determine whether the actual current-carrying capacity is greater than the theoretical current-carrying capacity. When the actual current-carrying capacity is greater than the theoretical current-carrying capacity, an alarm is issued through the alarm device, and the external load is adjusted to reduce the actual current-carrying capacity, thereby ensuring that the non-metallic armored cable operates at a safe temperature.

[0121] The present application provides an early warning method for the current carrying capacity of non-metallic optical cables. Compared with the existing technology, the system uses an optical fiber temperature measurement host to obtain the temperature data of the non-metallic armored optical cable, and determines the actual current carrying capacity in combination with the current carrying capacity calculation equipment. By establishing an optical cable structure model corresponding to the non-metallic armored optical cable, and configuring the parameters, meshing, and boundary conditions of the model, the model is made more consistent with the actual cable situation, and can accurately determine the current carrying capacity of the non-metallic armored optical cable wound on the winch drum in multiple layers, breaking through the limitations of traditional solutions; and comparing the actual and theoretical current carrying capacities for early warning judgment, changing the previous situation where the early warning deviation was large due to the inability to accurately determine the current carrying capacity, significantly improving the accuracy of the current carrying capacity early warning, and timely and accurate current carrying capacity early warning through the alarm device, allowing relevant personnel to discover abnormal current carrying capacity of the optical cable in advance, avoid failures caused by excessive current carrying capacity, ensure the safe and stable operation of the optical cable under the multi-layer winding working condition of the winch drum, and reduce the probability of accidents.

[0122] Based on the same inventive concept, embodiments of the present application further provide a device for determining the current carrying capacity of the non-metallic optical cable involved above. The solution provided by this device is similar to the solution described in the above-mentioned method. Therefore, the specific limitations of one or more embodiments of the device for determining the current carrying capacity of a non-metallic optical cable provided below can be found in the limitations of the method for determining the current carrying capacity of a non-metallic optical cable described above and will not be repeated here.

[0123] In an exemplary embodiment, a current carrying capacity calculation device is provided. The current carrying capacity calculation device can be a server or a terminal. The internal structure diagram thereof can be as follows: Figure 9 As shown. The current carrying capacity calculation device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the current carrying capacity calculation device is used to provide computing and control capabilities. The memory of the current carrying capacity calculation device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the current carrying capacity calculation device is used to store video tag processing data. The input / output interface of the current carrying capacity calculation device is used to exchange information between the processor and an external device. The communication interface of the current carrying capacity calculation device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for determining the current carrying capacity of a non-metallic optical cable is implemented.

[0124] Those skilled in the art will understand that Figure 9The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the current-carrying capacity calculation device to which the solution of the present application is applied. The specific current-carrying capacity calculation device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0125] In an exemplary embodiment, a current carrying capacity calculation device is further provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0126] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0127] In an exemplary embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0128] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0129] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0130] The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may include, but are not limited to, general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic units, data processing logic units based on quantum computing, and the like.

[0131] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0132] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. An early warning system for the current carrying capacity of non-metallic optical cables, characterized in that: The non-metallic optical cable current carrying capacity warning system includes: an optical fiber temperature measurement host, a non-metallic armored optical cable, a current carrying capacity calculation device, a winch drum, an optical fiber connector, and an alarm device; the non-metallic armored optical cable is wound on the winch drum, the current carrying capacity calculation device is electrically connected to the optical fiber temperature measurement host and the alarm device respectively, and the optical fiber temperature measurement host is also connected to the non-metallic armored optical cable via the optical fiber connector; The optical fiber temperature measurement host is used to: obtain the temperature data of the non-metallic armored optical cable and transmit it to the current carrying capacity calculation device; The current-carrying capacity calculation device is used to: determine the actual current-carrying capacity of the non-metallic armored optical cable based on the temperature data; establish an optical cable structure model corresponding to the non-metallic armored optical cable; perform parameter configuration, grid division, and boundary condition configuration on the optical cable structure model; apply current to the configured optical cable structure model to determine the target temperature field result of the optical cable structure model corresponding to the critical temperature value; determine the theoretical current-carrying capacity of the non-metallic armored optical cable based on the target temperature field result; and when the actual current-carrying capacity is greater than the theoretical current-carrying capacity, issue an alarm through the alarm device.

2. The non-metallic optical cable current carrying capacity warning system according to claim 1 is characterized in that: The current carrying capacity calculation device includes: a data acquisition module and a current carrying capacity calculation module; The data acquisition module is used to: receive temperature data sent by the optical fiber temperature measurement host; The current-carrying capacity calculation module is used to: determine the actual current-carrying capacity of the non-metallic armored optical cable based on the temperature data; perform finite element analysis on the non-metallic armored optical cable to establish an optical cable structure model corresponding to the non-metallic armored optical cable; configure parameters of component elements in the optical cable structure model; perform physical field coupling, meshing processing, and boundary condition configuration on the optical cable structure model; apply current to the configured optical cable structure model to determine the target temperature field result of the optical cable structure model corresponding to the critical temperature value; and determine the theoretical current-carrying capacity of the non-metallic armored optical cable based on the target temperature field result.

3. The non-metallic optical cable current carrying capacity warning system according to claim 2 is characterized in that: The current carrying capacity calculation module is also used for: Determining, based on the temperature distribution characteristics, key areas and other areas in the optical cable structure model; the key areas are areas in the optical cable structure model where the temperature gradient is greater than a preset threshold, and the other areas are areas in the optical cable structure model other than the key areas; The key area is divided into a first grid, and the other areas are divided into a second grid; the density of the first grid is smaller than that of the second grid.

4. The non-metallic optical cable current carrying capacity warning system according to claim 2 is characterized in that: The current carrying capacity calculation module is also used for: Applying current to the configured optical cable structure model to obtain temperature field results at various positions in the component elements; When the maximum temperature value in the temperature field result reaches the critical temperature value, the temperature field result is used as the target temperature field result.

5. The non-metallic optical cable current carrying capacity warning system according to claim 4 is characterized in that: The current carrying capacity calculation module is also used for: Determining the spatial coordinates of each position point on the cross section of the optical cable structure model; Heat conduction calculation processing is performed according to the spatial coordinates of each position point and the configured parameters of the component elements to obtain temperature field results of each position point.

6. The non-metallic optical cable current carrying capacity early warning system according to claim 2, characterized in that: The current carrying capacity calculation module is also used for: When the actual current-carrying capacity is greater than the theoretical current-carrying capacity, an alarm prompt instruction is generated and sent to the alarm device, so that the alarm device responds to the alarm prompt instruction and issues an alarm.

7. The non-metallic optical cable current carrying capacity warning system according to claim 6, characterized in that: The alarm device includes: a receiving module, a sending module and an alarm module; The receiving module is used to: receive the alarm prompt instruction, generate an alarm signal and send it to the alarm module; The alarm module is used to: in response to the alarm signal, perform an alarm operation and generate a load adjustment instruction and send it to the sending module; The sending module is used to send the load adjustment instruction to the external load, so as to reduce the actual current carrying capacity by adjusting the external load.

8. The non-metallic optical cable current carrying capacity early warning system according to claim 1 is characterized in that: The optical fiber temperature measurement host comprises: a pulse laser and a processing module connected to the pulse laser; The pulse laser is used to: emit laser pulses and inject them into the multimode optical fiber in the non-metallic armored optical cable through the optical fiber connector; receive the temperature-carrying Raman scattered light signal reflected by the multimode optical fiber and send it to the processing module; The processing module is used to analyze the Raman scattered light signal, obtain temperature data of the non-metallic armored optical cable, and transmit the temperature data to the current carrying capacity calculation device.

9. The non-metallic optical cable current carrying capacity warning system according to claim 2, characterized in that: The component elements include at least one of the following: conductor, insulator, optical fiber, steel pipe, filler, metal shielding layer, inner sheath, non-metallic armor, and outer sheath.

10. A non-metallic optical cable current carrying capacity early warning method, characterized in that: Applicable to the non-metallic optical cable current carrying capacity warning system as described in claims 1 to 9 above, the non-metallic optical cable current carrying capacity warning method includes: Acquiring temperature data of a non-metallic armored optical cable, and determining an actual current carrying capacity of the non-metallic armored optical cable based on the temperature data; Establishing an optical cable structure model corresponding to the non-metallic armored optical cable, and performing parameter configuration, mesh division, and boundary condition configuration on the optical cable structure model; Applying current to the configured optical cable structure model to determine the target temperature field result of the optical cable structure model corresponding to the critical temperature value; Determining the theoretical current carrying capacity of the non-metallic armored optical cable according to the target temperature field result; When the actual current-carrying capacity is greater than the theoretical current-carrying capacity, an alarm is issued through the alarm device.

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