Method and apparatus for measuring burial depth value of submarine cable

Abstract

The present application relates to the technical field of operation and maintenance of submarine cables, and in particular to a method and apparatus for measuring the burial depth value of a submarine cable. The method comprises: acquiring an external optical fiber temperature value, a seabed surface temperature value, and a submarine cable loss value; on the basis of a thermal resistance definition formula and a cable temperature calculation formula, respectively calculating seabed soil thermal resistance values; and on the basis of the seabed soil thermal resistance values obtained by means of the two formulas, acquiring a calculation model for the burial depth value of a submarine cable. According to the method, the burial depth value of a submarine cable can be measured in real time, and high measurement accuracy and reliability are achieved.

Description

Method and device for detecting buried depth of submarine cable

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 2023110144253, filed on August 11, 2023, entitled “Method and device for detecting the buried depth of submarine cables,” the entire text of which is hereby incorporated by reference. Technical Field

[0003] The present application relates to the technical field of submarine cable operation and maintenance, and in particular to a method and device for detecting the buried depth of a submarine cable. Background Art

[0004] In recent years, submarine cable failures have become frequent due to the complex seabed environment, resulting in significant economic losses. Under the influence of ocean currents or external forces, submarine cables often become partially exposed or suspended, significantly increasing the probability of failure. Therefore, a method to effectively protect submarine cables is needed.

[0005] Currently, in the existing technology, the means of burial depth detection include side-scan sonar detection, marine magnetometer detection, shallow layer profiler detection, etc., but these methods cannot achieve real-time monitoring and the monitoring results are easily affected by the external environment.

[0006] In response to the above problems, the present invention proposes a method and device for detecting the buried depth of a submarine cable. This method overcomes the shortcomings of existing detection methods, can detect the buried depth of a submarine cable in real time, and has high detection accuracy and reliability.

[0007] Summary of the Invention

[0008] Based on this, it is necessary to provide a method and device for detecting the burial depth of submarine cables in real time with high accuracy and reliability to address the above technical problems.

[0009] In a first aspect, the present application provides a method for detecting the buried depth of a submarine cable. The method comprises:

[0010] Obtain external optical fiber temperature, seabed temperature, and submarine cable loss;

[0011] The thermal resistance of seabed soil is calculated based on the thermal resistance definition formula and the cable temperature calculation formula;

[0012] A calculation model for obtaining the buried depth of submarine cables based on the thermal resistance of seabed soil obtained using two formulas;

[0013] The buried depth value of the submarine cable is obtained through the calculation model.

[0014] In one embodiment, the calculating of the seabed soil thermal resistance value based on the thermal resistance definition formula and the cable temperature calculation formula respectively includes:

[0015] The formula for calculating the thermal resistance of seabed soil based on the thermal resistance definition formula is as follows:

[0016] Where T1 is the thermal resistance of the seabed soil; θ1 is the seabed surface temperature; θ2 is the temperature of the external optical fiber; W a is the submarine cable loss value;

[0017] The formula for the thermal resistance of the seabed soil calculated based on the cable temperature calculation formula is as follows:

[0018] Among them, ρ T is the soil thermal resistance coefficient, D e is the outer diameter of the submarine cable, and L is the burial depth of the submarine cable.

[0019] In one embodiment, the submarine cable loss value W a Including core loss value W1, insulation medium loss value W d , metal layer loss value W2;

[0020] The core loss value W1 is calculated as follows: W1 = I 2 R;

[0021] Where I is the current load; R is the AC resistance per unit length of the conductor at the highest operating temperature; α 20 The resistivity temperature coefficient of the conductor at 20°C; θ max is the maximum operating temperature of the conductor; s is the skin effect coefficient; y p is the proximity effect coefficient; ρ 20 is the volume resistivity of the conductor at 20°C; D1 is the outer diameter of the oil channel; D2 is the outer diameter of the conductor;

[0022] The insulation dielectric loss value W d The calculation formula is as follows:

[0023] Where f is the current frequency; C is the capacitance per unit length of the submarine cable; U0 is the voltage value of the submarine cable; tanδ is the insulation dielectric loss factor at the power frequency and operating temperature;

[0024] The calculation formula of the metal layer loss value W2 is as follows: W2 = λ1′·W1;

[0025] Where λ1' is the metal sheath loss factor.

[0026] In one embodiment, the method further comprises:

[0027] Determining whether the submarine cable is a submarine cable that is arranged in parallel, has its metal sheaths directly grounded at both ends, and has no three-phase transposition;

[0028] If yes, then obtain the three-phase metal sheath loss factors of the submarine cable respectively; wherein,

[0029] The calculation formula of the outer lagging phase metal sheath loss factor of the submarine cable is as follows:

[0030] The calculation formula of the outer leading phase metal sheath loss factor of the submarine cable is as follows:

[0031] The calculation formula of the intermediate phase metal sheath loss factor of the submarine cable is as follows:

[0032] P=X+X m ; X m =2πfln(2)×10 -7 ;

[0033] Where P is active power; Q is reactive power; X is the metal sheath reactance per unit length of adjacent phases of submarine cable; X m is the mutual reactance between the metal sheath per unit length of one phase of the submarine cable and the metal sheaths per unit length of the other two phases; s is the axial spacing of the conductors; d is the average diameter of the metal sheath; R s is the resistance of the metal sheath;

[0034] If the reinforcement layer and armor of the submarine cable are both made of non-magnetic materials, the loss factors of the three-phase metal sheaths are calculated together;

[0035] Combined calculated metal sheath resistance R s The calculation formula of ' and metal sheath diameter d' is as follows:

[0036] Among them, R A1 and R A2 are the AC resistance per unit length of the reinforcement layer and armor at the maximum operating temperature; d1 and d2 are the diameters of the reinforcement layer and armor, respectively.

[0037] In one embodiment, when u=10, L=5D e Accordingly, the calculation model includes:

[0038] Among them, ρT is the soil thermal resistance coefficient, D e is the outer diameter of the submarine cable, L is the buried depth of the submarine cable, θ1 is the seabed temperature; θ2 is the temperature of the external optical fiber; W a is the submarine cable loss value.

[0039] In one embodiment, the submarine cable has multiple sets of buried depth values; the method further comprises:

[0040] Analyze multiple groups of burial depth values ​​to obtain correlation trends between errors of the burial depth values ​​and the current load, and correlation trends between errors of the burial depth values ​​and the burial depth values, and display them.

[0041] In a second aspect, the present application also provides a device for detecting the buried depth of a submarine cable. The device comprises:

[0042] A data acquisition module is used to obtain the external optical fiber temperature value, the seabed surface temperature value and the submarine cable loss value;

[0043] A calculation module, used to calculate the thermal resistance value of the seabed soil based on the thermal resistance definition formula and the cable temperature calculation formula;

[0044] A model building module 504 is used to calculate a depth of the submarine cable based on the thermal resistance of the seabed soil obtained using the two formulas;

[0045] The calculation module is further used to obtain the buried depth value of the submarine cable through the calculation model.

[0046] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are performed:

[0047] Obtain external optical fiber temperature, seabed temperature, and submarine cable loss;

[0048] The thermal resistance of seabed soil is calculated based on the thermal resistance definition formula and the cable temperature calculation formula;

[0049] A calculation model for obtaining the buried depth of submarine cables based on the thermal resistance of seabed soil obtained using two formulas;

[0050] The buried depth value of the submarine cable is obtained through the calculation model.

[0051] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the following steps:

[0052] Obtain external optical fiber temperature, seabed temperature, and submarine cable loss;

[0053] The thermal resistance of seabed soil is calculated based on the thermal resistance definition formula and the cable temperature calculation formula;

[0054] A calculation model for obtaining the buried depth of submarine cables based on the thermal resistance of seabed soil obtained using two formulas;

[0055] The buried depth value of the submarine cable is obtained through the calculation model.

[0056] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the following steps:

[0057] Obtain external optical fiber temperature, seabed temperature, and submarine cable loss;

[0058] The thermal resistance of seabed soil is calculated based on the thermal resistance definition formula and the cable temperature calculation formula;

[0059] A calculation model for obtaining the buried depth of submarine cables based on the thermal resistance of seabed soil obtained using two formulas;

[0060] The buried depth value of the submarine cable is obtained through the calculation model.

[0061] The above-mentioned submarine cable burial depth detection method, device, computer equipment, storage medium and computer program product can use this method to calculate the burial depth of the submarine cable in real time based on the changes in the temperature value of the external optical fiber, the seabed surface temperature value and the submarine cable loss value. This method has a small amount of calculation and is easy to promote and apply, which is of great significance for ensuring the safe and stable operation of submarine cables and extending their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] FIG1 is a diagram illustrating an application environment of a method for detecting the buried depth of a submarine cable according to an embodiment;

[0063] FIG2 is a schematic flow chart of a method for detecting the buried depth of a submarine cable according to an embodiment;

[0064] FIG3 is a diagram showing the buried depth of a submarine cable in one embodiment;

[0065] FIG4 is a graph showing an error curve in calculating the buried depth of a submarine cable in one embodiment;

[0066] FIG5 is a structural block diagram of a device for detecting the buried depth of a submarine cable according to one embodiment;

[0067] FIG6 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0068] 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.

[0069] The method for detecting the buried depth of a submarine cable provided in an embodiment of the present application can be applied in an application environment as shown in FIG1 . The terminal 102 communicates with the server 104 via a network. The data storage system can store data that the server 104 needs to process. The data storage system can be integrated on the server 104 or placed on a cloud or other network server. The server 104 obtains the external optical fiber temperature value, the seabed surface temperature value, and the submarine cable loss value, and then uses two calculation methods to calculate the seabed soil thermal resistance value respectively, and then obtains a calculation model for the buried depth value of the submarine cable, and finally obtains the buried depth value of the submarine cable. The terminal 102 can be, but is not limited to, various personal computers, laptops, smart phones, tablets, Internet of Things devices, and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, etc. Portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. The server 104 can be implemented as an independent server or a server cluster consisting of multiple servers.

[0070] It should be noted that the submarine cable mentioned in the submarine cable burial depth detection method, device, computer equipment, storage medium and computer program product given in this aspect is preferably a 500kV AC single-core oil-filled cable as the research object, which is composed of an oil channel, a copper conductor, a conductor shield, an impregnated paper tape insulation, an insulation shield, a first layer of copper conductive tape, an aluminum alloy sheath, a second layer of copper conductive tape, a bronze tape, a first layer of lining, a polyethylene sheath, an anti-moth layer, a second layer of lining, a flat copper wire armor and an outer sheath.

[0071] The structural parameters of submarine cables are shown in Table 1.

[0072] Table 1 Structural parameters of submarine cables

[0073] The material parameters of submarine cables are shown in Table 2.

[0074] Table 2 Submarine cable material parameters

[0075] In one embodiment, as shown in FIG2 , a method for detecting the buried depth of a submarine cable is provided. The method is described by applying the method to the server in FIG1 as an example, including the following steps:

[0076] Step S202: Obtain the external optical fiber temperature value, the seabed surface temperature value, and the submarine cable loss value.

[0077] Specifically, the external fiber temperature value refers to the temperature of the external environment in which the fiber is exposed. In submarine cable applications, the external fiber temperature value refers to the seawater temperature in which the fiber is exposed, or it can also refer to the ambient temperature surrounding the fiber. The seabed surface temperature value refers to the temperature of the seabed surface. In submarine cable applications, the seabed surface temperature value refers to the temperature of the seabed surface, or it can also be understood as the surface temperature of the seabed. The submarine cable loss value refers to the loss incurred by the submarine cable during signal or energy transmission. These losses include resistance loss, waveguide loss, flexure loss, etc.

[0078] Step S204: Calculate the seabed soil thermal resistance value based on the thermal resistance definition formula and the cable temperature calculation formula.

[0079] Specifically, in this solution, the thermal resistance definition formula refers to the physical quantity that hinders the flow of heat during heat conduction by comparing the temperature difference between two hot spots (in this solution, it refers to the temperature of each point along the submarine cable monitored in real time by a distributed optical fiber temperature measurement system) and the ratio of the heat flow. The cable temperature calculation formula in this solution preferably uses the IEC-60287-2-1 standard to calculate the thermal resistance of seabed soil. The IEC-60287-2-1 standard mainly involves the calculation method of the thermal resistance of power cables. This standard provides a set of standardized calculation methods for evaluating the thermal resistance value of cables. It includes thermal resistance calculation methods for different types of cables, different environmental conditions and heat dissipation methods to ensure that the cable does not overheat under normal working conditions. Among them, the relevant factors in the calculation method mentioned in the IEC-60287-2-1 standard include the burial depth of the submarine cable.

[0080] Step S206: a calculation model for obtaining the buried depth of the submarine cable according to the seabed soil thermal resistance values ​​obtained using the two formulas.

[0081] Specifically, an equation relationship is constructed based on the thermal resistance values ​​of the seabed soil obtained by the two formulas. Since the relevant factors in the calculation method mentioned in the IEC-60287 standard include the burial depth of the submarine cable, a calculation model for the burial depth of the submarine cable is obtained jointly.

[0082] Step S208: Obtain the buried depth of the submarine cable through the calculation model.

[0083] Specifically, according to the calculation model, by real-time monitoring of the different optical fiber temperature values ​​at various points along the submarine cable, multiple sets of burial depth data can be obtained. Compared with the existing technology of side-scan sonar detection, ocean magnetometer detection, shallow layer profiler detection, etc., this solution can monitor the burial depth of the submarine cable in real time and the monitoring results are not easily affected by the external environment.

[0084] In one embodiment, the formula for the seabed soil thermal resistance value calculated based on the thermal resistance definition formula in step S204 is as follows:

[0085] Where T1 is the thermal resistance of the seabed soil; θ1 is the seabed surface temperature; θ2 is the temperature of the external optical fiber; W a is the submarine cable loss value;

[0086] Among them, ρ T is the soil thermal resistance coefficient, D e is the outer diameter of the submarine cable, and L is the burial depth of the submarine cable.

[0087] In one embodiment, the submarine cable loss value W a Including core loss value W1, insulation medium loss value W d , metal layer loss value W2;

[0088] The calculation formula of the core loss value W1 is as follows: W1=I 2 R;

[0089] Where I is the current load; R is the AC resistance per unit length of the conductor at the highest operating temperature; α 20 The resistivity temperature coefficient of the conductor at 20°C; θ max is the maximum operating temperature of the conductor; s is the skin effect coefficient; y p is the proximity effect coefficient; ρ 20 is the volume resistivity of the conductor at 20°C; D1 is the outer diameter of the oil channel; D2 is the outer diameter of the conductor;

[0090] Insulation dielectric loss value W d The calculation formula is as follows:

[0091] Where f is the current frequency; C is the capacitance per unit length of the submarine cable; U0 is the voltage value of the submarine cable; tanδ is the insulation dielectric loss factor at the power frequency and operating temperature;

[0092] The calculation formula of the metal layer loss value W2 is as follows: W2 = λ1′·W1;

[0093] Where λ1' is the metal sheath loss factor.

[0094] In one embodiment, it is determined whether the submarine cable is a submarine cable that is arranged in parallel, has its metal sheaths directly grounded at both ends, and has no three-phase transposition;

[0095] If yes, then obtain the three-phase metal sheath loss factors of the submarine cable respectively; wherein,

[0096] The calculation formula of the outer lagging phase metal sheath loss factor of the submarine cable is as follows:

[0097] The calculation formula of the loss factor of the outer leading phase metal sheath of the submarine cable is as follows:

[0098] The calculation formula for the loss factor of the intermediate phase metal sheath of the submarine cable is as follows:

[0099] P=X+X m ; X m =2πfln(2)×10- 7 ;

[0100] Where P is active power; Q is reactive power; X is the metal sheath reactance per unit length of adjacent phases of submarine cable; X m is the mutual reactance between the metal sheath per unit length of one phase of the submarine cable and the metal sheaths per unit length of the other two phases; s is the axial spacing of the conductors; d is the average diameter of the metal sheath; R s is the resistance of the metal sheath;

[0101] If the reinforcement layer and armor of the submarine cable are both made of non-magnetic materials, the loss factors of the three-phase metal sheaths are calculated together;

[0102] Combined calculated metal sheath resistance R s The calculation formula of ' and metal sheath diameter d' is as follows:

[0103] Among them, R A1 and R A2 are the AC resistance per unit length of the reinforcement layer and armor at the maximum operating temperature; d1 and d2 are the diameters of the reinforcement layer and armor, respectively.

[0104] In one embodiment, the formula for the seabed soil thermal resistance value calculated according to the cable temperature calculation formula in step S204 is as follows, based on the IEC-60287-2-1 standard:

[0105] When u≥10, that is, L≥5D eWhen , the above formula can be approximated as:

[0106] The calculation model for obtaining the buried depth of the submarine cable based on the seabed soil thermal resistance values ​​obtained using the two formulas in step S206 includes:

[0107] according to Available,

[0108] The calculation model of the buried depth of submarine cables is:

[0109] In one embodiment, in step S208 , the buried depth value of the submarine cable is obtained according to a calculation model of the buried depth value of the submarine cable.

[0110] As shown in Table 3, there are 20 sets of data calculated by the calculation model.

[0111] 20 sets of data were used to verify the accuracy of the method proposed in the present invention. The specific data are shown in Table 3.

[0112] Table 3 Different current and burial depth data

[0113] In one embodiment, the above multiple groups of burial depth values ​​are analyzed to obtain the correlation trend between the error of the burial depth value and the current load, as well as the correlation trend between the error of the burial depth value and the burial depth value, and display them as shown in Figures 3 and 4.

[0114] It can be seen that when the current load increases, the error of the calculated depth value (i.e. the buried depth value mentioned in this application) will decrease; when the actual buried depth increases, the error of the calculated depth value will increase. The error of the calculated depth value can be obtained by subtracting the parameters of the horizontal and vertical coordinates of Figure 3.

[0115] The method proposed in this invention is very accurate when the actual burial depth is small. When the actual burial depth is 0.3m, the maximum absolute error of the burial depth calculation under different current loads is only 13.6cm.

[0116] It should be understood that, although the steps in the flowcharts of the above-described embodiments are shown in arrows, unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts of the above-described embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a portion of the steps or stages in other steps.

[0117] Based on the same inventive concept, embodiments of the present application also provide a submarine cable burial depth detection device for implementing the aforementioned submarine cable burial depth detection method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more submarine cable burial depth detection device embodiments provided below can be found in the aforementioned limitations of the submarine cable burial depth detection method, and will not be further elaborated here.

[0118] In one embodiment, as shown in FIG5 , a device for detecting the buried depth of a submarine cable is provided, comprising: a data acquisition module 502 for acquiring a temperature value of an external optical fiber, a temperature value of a seabed surface, and a loss value of a submarine cable;

[0119] The calculation module 506 is used to calculate the thermal resistance value of the seabed soil based on the thermal resistance definition formula and the cable temperature calculation formula.

[0120] The model building module 504 is used to obtain a calculation model of the buried depth value of the submarine cable according to the seabed soil thermal resistance values ​​obtained using the two formulas.

[0121] The calculation module 506 is further configured to obtain the buried depth of the submarine cable through a calculation model.

[0122] In one embodiment, the thermal resistance value of the seabed soil is calculated based on the thermal resistance definition formula as follows:

[0123] Where T1 is the thermal resistance of the seabed soil; θ1 is the seabed surface temperature; θ2 is the temperature of the external optical fiber; W a is the submarine cable loss value;

[0124] The formula for the thermal resistance of the seabed soil calculated based on the cable temperature calculation formula is as follows:

[0125] Among them, ρ T is the soil thermal resistance coefficient, D e is the outer diameter of the submarine cable, and L is the burial depth of the submarine cable.

[0126] In one embodiment, the submarine cable loss value W a Including core loss value W1, insulation medium loss value W d , metal layer loss value W2;

[0127] The calculation formula of the core loss value W1 is as follows: W1=I 2 R;

[0128] Where I is the current load; R is the AC resistance per unit length of the conductor at the highest operating temperature; α20 The resistivity temperature coefficient of the conductor at 20°C; θ max is the maximum operating temperature of the conductor; s is the skin effect coefficient; y p is the proximity effect coefficient; ρ 20 is the volume resistivity of the conductor at 20°C; D1 is the outer diameter of the oil channel; D2 is the outer diameter of the conductor;

[0129] Insulation dielectric loss value W d The calculation formula is as follows:

[0130] Where f is the current frequency; C is the capacitance per unit length of the submarine cable; U0 is the voltage value of the submarine cable; tanδ is the insulation dielectric loss factor at the power frequency and operating temperature;

[0131] The calculation formula of the metal layer loss value W2 is as follows: W2 = λ1′·W1;

[0132] Where λ1' is the metal sheath loss factor.

[0133] In one embodiment, the calculation module 506 is further configured to determine whether the submarine cable is a submarine cable that is arranged in parallel, has its metal sheaths directly grounded at both ends, and has no three-phase transposition.

[0134] If yes, the data acquisition module 502 is further configured to respectively acquire the three-phase metal sheath loss factors of the submarine cable; wherein,

[0135] The calculation formula of the outer lagging phase metal sheath loss factor of the submarine cable is as follows:

[0136] The calculation formula of the loss factor of the outer leading phase metal sheath of the submarine cable is as follows:

[0137] The calculation formula for the loss factor of the intermediate phase metal sheath of the submarine cable is as follows:

[0138] Where P is active power; Q is reactive power; X is the metal sheath reactance per unit length of adjacent phases of submarine cable; X m is the mutual reactance between the metal sheath per unit length of one phase of the submarine cable and the metal sheaths per unit length of the other two phases; s is the axial spacing of the conductors; d is the average diameter of the metal sheath; R s is the resistance of the metal sheath;

[0139] If the reinforcement layer and armor of the submarine cable are both made of non-magnetic materials, the calculation module 506 is also used to perform a combined calculation of the three-phase metal sheath loss factors;

[0140] Combined calculated metal sheath resistance R s The calculation formula of ' and metal sheath diameter d' is as follows:

[0141] Among them, R A1 and R A2 are the AC resistance per unit length of the reinforcement layer and armor at the maximum operating temperature; d1 and d2 are the diameters of the reinforcement layer and armor, respectively.

[0142] In one embodiment, u=10, L=5D e When , accordingly, the calculation model includes:

[0143] Among them, ρ T is the soil thermal resistance coefficient, D e is the outer diameter of the submarine cable, L is the buried depth of the submarine cable, θ1 is the seabed temperature; θ2 is the temperature of the external optical fiber; W a is the submarine cable loss value.

[0144] In one embodiment, the device further includes a display module (not shown).

[0145] There are multiple groups of burial depth values ​​for the submarine cable; the calculation module 506 is also used to analyze the multiple groups of burial depth values, obtain the correlation trend between the error of the burial depth value and the current load, and the correlation trend between the error of the burial depth value and the burial depth value, and display them through the display module.

[0146] Each module in the above-mentioned submarine cable depth detection device can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0147] In one embodiment, a computer device is provided, which may be a terminal. Its internal structure diagram may be shown in Figure 6. The computer device includes a processor, memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are connected to the system bus via the input / output interface. The processor of the computer device provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals via wired or wireless communication, where the wireless communication may be achieved via Wi-Fi, a mobile cellular network, NFC (near-field communication), or other technologies. When executed by the processor, the computer program implements a method for detecting the buried depth of a submarine cable. The display unit of the computer device is used to produce a visually visible image and may be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device casing, or an external keyboard, touchpad or mouse.

[0148] Those skilled in the art will understand that the structure shown in FIG6 is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0149] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0150] Obtain external optical fiber temperature, seabed temperature, and submarine cable loss;

[0151] The thermal resistance of seabed soil is calculated based on the thermal resistance definition formula and the cable temperature calculation formula;

[0152] A calculation model for obtaining the buried depth of submarine cables based on the thermal resistance of seabed soil obtained using two formulas;

[0153] The buried depth of the submarine cable is obtained through the calculation model.

[0154] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0155] Obtain external optical fiber temperature, seabed temperature, and submarine cable loss;

[0156] The thermal resistance of seabed soil is calculated based on the thermal resistance definition formula and the cable temperature calculation formula;

[0157] A calculation model for obtaining the buried depth of submarine cables based on the thermal resistance of seabed soil obtained using two formulas;

[0158] The buried depth of the submarine cable is obtained through the calculation model.

[0159] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0160] Obtain external optical fiber temperature, seabed temperature, and submarine cable loss;

[0161] The thermal resistance of seabed soil is calculated based on the thermal resistance definition formula and the cable temperature calculation formula;

[0162] A calculation model for obtaining the buried depth of submarine cables based on the thermal resistance of seabed soil obtained using two formulas;

[0163] The buried depth of the submarine cable is obtained through the calculation model.

[0164] 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 the relevant laws, regulations and standards of relevant countries and regions.

[0165] Those skilled in the art will appreciate 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 can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database 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 processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0166] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0167] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for detecting the buried depth of a submarine cable, characterized in that: The method comprises: Obtain external optical fiber temperature value, seabed surface temperature value and submarine cable loss value; The thermal resistance of the seabed soil is calculated based on the thermal resistance definition formula and the cable temperature calculation formula; A calculation model for obtaining the buried depth of the submarine cable based on the thermal resistance of the seabed soil obtained using two formulas; The buried depth value of the submarine cable is obtained through the calculation model.

2. The method according to claim 1, characterized in that The thermal resistance value of the seabed soil is calculated based on the thermal resistance definition formula and the cable temperature calculation formula, including: The formula for the thermal resistance of seabed soil calculated based on the thermal resistance definition formula is as follows: Where T1 is the thermal resistance of the seabed soil; θ1 is the seabed surface temperature; θ2 is the external optical fiber temperature; W a is the submarine cable loss value; The formula for the thermal resistance of the seabed soil calculated according to the cable temperature calculation formula is as follows: Among them, ρ T is the soil thermal resistance coefficient, D e is the outer diameter of the submarine cable, and L is the buried depth of the submarine cable.

3. The method according to claim 2, characterized in that The submarine cable loss value W a Including core loss value W1, insulation medium loss value W d , metal layer loss value W2; The core loss value W1 is calculated as follows: W1=I 2 R; Where I is the current load; R is the AC resistance per unit length of the conductor at the highest operating temperature; α 20 The resistivity temperature coefficient of the conductor at 20°C; θ max is the maximum operating temperature of the conductor; s is the skin effect coefficient; y p is the proximity effect coefficient; ρ 20 is the volume resistivity of the conductor at 20°C; D1 is the outer diameter of the oil channel; D2 is the outer diameter of the conductor; The insulation medium loss value W d The calculation formula is as follows: Where f is the current frequency; C is the capacitance per unit length of the submarine cable; U0 is the voltage value of the submarine cable; tanδ is the insulation dielectric loss factor at the power frequency and working temperature; The calculation formula of the metal layer loss value W2 is as follows: W2=λ1′·W1; Where λ1' is the metal sheath loss factor.

4. The method according to claim 3, characterized in that The method further comprises: Determine whether the submarine cable is a submarine cable that is arranged in parallel, has two ends of a metal sheath directly grounded, and has three phases that are not transposed; If yes, then obtain the three-phase metal sheath loss factors of the submarine cable respectively; wherein, The calculation formula of the outer lagging phase metal sheath loss factor of the submarine cable is as follows: The calculation formula of the outer leading phase metal sheath loss factor of the submarine cable is as follows: The calculation formula of the intermediate phase metal sheath loss factor of the submarine cable is as follows: Where P is active power; Q is reactive power; X is the metal sheath reactance per unit length of adjacent phases of the submarine cable; X m is the mutual reactance between the metal sheath per unit length of one phase of the submarine cable and the metal sheath per unit length of the other two phases; s is the axial spacing of the conductors; d is the average diameter of the metal sheath; R s is the resistance of the metal sheath; If the reinforcement layer and armor of the submarine cable are both made of non-magnetic materials, the three-phase metal sheath loss factors are calculated together; Combined calculated metal sheath resistance R s The calculation formula of ' and metal sheath diameter d' is as follows: Among them, R A1 and R A2 are the AC resistance per unit length of the reinforcement layer and armor at the highest operating temperature; d1 and d2 are the diameters of the reinforcement layer and armor respectively.

5. The method according to any one of claim 2, characterized in that: When u=10,L=5D e Accordingly, the calculation model includes: Among them, ρ T is the soil thermal resistance coefficient, D e is the outer diameter of the submarine cable, L is the buried depth of the submarine cable, θ1 is the seabed temperature; θ2 is the temperature of the external optical fiber; W a is the submarine cable loss value.

6. The method according to claim 3, characterized in that The buried depth values ​​of the submarine cable are multiple groups; the method further comprises: Analyze multiple groups of burial depth values, obtain the correlation trend between the error of the burial depth value and the current load, and the correlation trend between the error of the burial depth value and the burial depth value, and display them.

7. A device for detecting the buried depth of a submarine cable, characterized in that: The device comprises: A data acquisition module is used to obtain the temperature value of the external optical fiber, the temperature value of the seabed surface and the loss value of the submarine cable; A calculation module, used for respectively calculating the thermal resistance value of seabed soil based on the thermal resistance definition formula and the cable temperature calculation formula; A model building module 504 is used to obtain a calculation model of the buried depth value of the submarine cable according to the thermal resistance value of the seabed soil obtained by using two formulas; The calculation module is also used to obtain the buried depth value of the submarine cable through the calculation model.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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