A filling degree detection method, device and equipment of a non-coaxial high-voltage cable repair liquid and a storage medium

Abstract

The application discloses a kind of non-coaxial high-voltage cable repair liquid filling degree detection method, device, equipment and storage medium, based on the structure of non-coaxial high-voltage cable and is constructed steady-state thermal circuit model of non-coaxial high-voltage cable filled with repair liquid, based on the shape factor of non-coaxial high-voltage cable, the theoretical thermal resistance of inner lining filled with repair liquid is calculated, shape factor is used to characterize the shape of the cross section of non-coaxial high-voltage cable, according to the actual acquisition of outer sheath temperature, metal sheath temperature and insulation layer temperature, combined with steady-state thermal circuit model, the actual thermal resistance of inner lining filled with repair liquid is calculated, the ratio of actual thermal resistance and theoretical thermal resistance is calculated, and the filling degree of non-coaxial high-voltage cable is obtained, by accurately detecting the filling degree of non-coaxial high-voltage cable repair liquid, provide the basis for evaluating the stability of cable long-time operation.

Description

TECHNICAL FIELD

[0001] The present application relates to power cable technology, and in particular to a method and device for detecting the filling degree of a non-coaxial high-voltage cable repair liquid, an equipment and a storage medium. BACKGROUND

[0002] In combination with the actual laying environment of the cable, to prevent the internal structure of the cable from being damaged due to cable bending during construction or laying, some cable manufacturers leave a certain margin between the size cooperation of the buffer layer and the metal sheath, resulting in a certain thickness of air gap between the buffer layer and the metal sheath. The structure composed of the buffer layer and the air gap layer is called the inner liner. Due to the influence of gravity and the air gap layer, the geometric center of the cable part inside the buffer layer is different from the geometric center of the metal sheath. Moreover, with the large-scale application of high-voltage cables, body failure events caused by discharge ablation of the buffer layer have occurred successively in various places. Research has found that there are white spot defects at the contact part of the buffer layer and the metal sheath. The continuous development of these defects will lead to ablation discharge of the insulation shield and even the main insulation. Therefore, when the buffer layer has white spots, it needs to be repaired by filling repair liquid.

[0003] For the repaired cable, many current studies focus on detecting the discharge capacity of the repaired inner liner. Specifically, by detecting and comparing the partial discharge signal results of the defective cable before and after repair, the effectiveness of the repair method is verified. This scheme fails to detect the filling degree of the repair liquid, which is an important parameter affecting the evaluation of the long-term stable operation of the cable. SUMMARY

[0004] The present application provides a method and device for detecting the filling degree of a non-coaxial high-voltage cable repair liquid, an equipment and a storage medium, to realize the detection of the filling degree of the non-coaxial high-voltage cable repair liquid, so as to accurately evaluate the stability of the long-term operation of the cable.

[0005] In a first aspect, the present application provides a method for detecting the filling degree of a non-coaxial high-voltage cable repair liquid, comprising:

[0006] constructing a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with repair liquid based on the structural composition of the non-coaxial high-voltage cable;

[0007] calculating the theoretical thermal resistance of the inner liner filled with repair liquid based on the shape factor of the non-coaxial high-voltage cable, the shape factor being used to represent the shape of the cross section of the non-coaxial high-voltage cable;

[0008] calculating the actual thermal resistance of the inner liner filled with repair liquid according to the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, in combination with the steady-state thermal circuit model;

[0009] The ratio of the actual thermal resistance and the theoretical thermal resistance is calculated to obtain the filling degree of the non-coaxial high-voltage cable.

[0010] Optionally, the theoretical thermal resistance of the inner liner filled with the repair liquid is calculated based on the shape factor of the non-coaxial high-voltage cable, comprising:

[0011] The shape factor of the non-coaxial high-voltage cable is calculated based on the equivalent inner radius of the inner liner, the equivalent radius of the inner surface of the metal sheath, and the eccentricity of the buffer layer and the metal sheath.

[0012] The theoretical thermal resistance of the inner liner filled with the repair liquid is calculated based on the shape factor of the non-coaxial high-voltage cable and the thermal conductivity of the repair liquid.

[0013] Optionally, the calculation formula of the shape factor of the non-coaxial high-voltage cable is as follows:

[0014]

[0015] Wherein, S is the shape factor of the non-coaxial high-voltage cable, r1 is the equivalent radius of the outer surface of the inner liner, r2 is the equivalent radius of the inner surface of the metal sheath, and e is the eccentricity.

[0016] Optionally, the calculation formula of the theoretical thermal resistance of the inner liner filled with the repair liquid is as follows:

[0017]

[0018] Wherein, T2' is the theoretical thermal resistance, λ2 is the thermal conductivity of the repair liquid, and S is the shape factor of the non-coaxial high-voltage cable.

[0019] Optionally, the actual thermal resistance of the inner liner filled with the repair liquid is calculated based on the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, combined with the steady-state thermal circuit model, comprising:

[0020] The heat generation heat flow of the cable core of the non-coaxial high-voltage cable is calculated based on the actually collected outer sheath temperature, metal sheath temperature and thermal resistance of the outer sheath, combined with the steady-state thermal circuit model.

[0021] The actual thermal resistance of the inner liner filled with the repair liquid is calculated based on the heat generation heat flow of the cable core of the non-coaxial high-voltage cable, the metal sheath temperature and the insulation layer temperature, combined with the steady-state thermal circuit model.

[0022] Optionally, the calculation formula of the heat generation heat flow of the cable core of the non-coaxial high-voltage cable is as follows:

[0023]

[0024] Wherein, Q is the heat flow of the cable core of the non-coaxial high-voltage cable, θ1 is the metal sheath temperature, θ0 is the outer sheath temperature, and T1 is the thermal resistance of the outer sheath.

[0025] Optionally, the calculation formula of the actual thermal resistance of the inner lining filled with the repair liquid is:

[0026]

[0027] Wherein, T2 is the actual thermal resistance, θ1 is the metal sheath temperature, θ2 is the insulation layer temperature, and Q is the heat flow of the cable core of the non-coaxial high-voltage cable.

[0028] In a second aspect, the present application further provides a non-coaxial high-voltage cable repair liquid filling degree detection device, comprising:

[0029] A thermal circuit model construction module is configured to construct a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with the repair liquid based on the structural composition of the non-coaxial high-voltage cable.

[0030] A theoretical thermal resistance calculation module is configured to calculate a theoretical thermal resistance of the inner lining filled with the repair liquid based on a shape factor of the non-coaxial high-voltage cable, the shape factor being used to represent the shape of the cross section of the non-coaxial high-voltage cable.

[0031] An actual thermal resistance calculation module is configured to calculate an actual thermal resistance of the inner lining filled with the repair liquid according to the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, and in combination with the steady-state thermal circuit model.

[0032] A filling degree calculation module is configured to calculate the ratio of the actual thermal resistance to the theoretical thermal resistance to obtain the filling degree of the non-coaxial high-voltage cable.

[0033] In a third aspect, the present application further provides an electronic device, comprising:

[0034] One or more processors;

[0035] A storage device configured to store one or more programs;

[0036] When the one or more programs are executed by the one or more processors, the one or more processors implement the non-coaxial high-voltage cable repair liquid filling degree detection method provided in the first aspect of the present application.

[0037] In a fourth aspect, the present application further provides a computer readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the non-coaxial high-voltage cable repair liquid filling degree detection method provided in the first aspect of the present application.

[0038] The application provides a filling degree detection method of the non-coaxial high-voltage cable repair liquid, a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with the repair liquid is constructed based on the structural composition of the non-coaxial high-voltage cable, a theoretical thermal resistance of the inner lining layer filled with the repair liquid is calculated based on the shape factor of the non-coaxial high-voltage cable, the shape factor is used to represent the shape of the cross section of the non-coaxial high-voltage cable, the actual thermal resistance of the inner lining layer filled with the repair liquid is calculated according to the actually collected outer sheath temperature, metal sheath temperature and insulating layer temperature, and in combination with the steady-state thermal circuit model, the ratio of the actual thermal resistance and the theoretical thermal resistance is calculated, and the filling degree of the non-coaxial high-voltage cable is obtained, so that the filling degree of the non-coaxial high-voltage cable repair liquid is accurately detected, and a basis for evaluating the stability of the cable during long-time operation is provided.

[0039] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the application, nor is it used to limit the scope of the application. Other features of the application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0041] Figure 1 A flow chart of the filling degree detection method of the non-coaxial high-voltage cable repair liquid provided by the application;

[0042] Figure 2 A circuit diagram of the steady-state thermal circuit model of the non-coaxial high-voltage cable filled with the repair liquid provided by the application;

[0043] Figure 3 A schematic diagram of the relative position relationship between the metal sheath and the inner lining layer in the non-coaxial high-voltage cable provided by the application;

[0044] Figure 4 A structural schematic diagram of the filling degree detection device of the non-coaxial high-voltage cable repair liquid provided by the application;

[0045] Figure 5 A structural schematic diagram of an electronic device provided by the application.

[0046] Through the above drawings, the specific embodiments of the application have been shown, and more detailed descriptions will be given hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the application by any means, but to illustrate the concept of the application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0047] In order to make the technical personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should belong to the scope of protection of the present application.

[0048] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units need not be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0049] Figure 1 A flowchart of a filling degree detection method of a non-coaxial high-voltage cable repair liquid is provided for the present application. The present embodiment can be applied to calculate the filling degree of the non-coaxial high-voltage cable repair liquid, so as to accurately evaluate the stability of the cable during long-time operation. The method can be executed by the filling degree detection device of the non-coaxial high-voltage cable repair liquid provided by the present embodiment, which can be realized by software and / or hardware, and is usually configured in an electronic device, such as a computer. Figure 1 The filling degree detection method of the non-coaxial high-voltage cable repair liquid includes the following steps:

[0050] S101, a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with the repair liquid is constructed based on the structural composition of the non-coaxial high-voltage cable.

[0051] In the present embodiment, a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with the repair liquid is constructed based on the structural composition of the non-coaxial high-voltage cable. In the power cable, the steady-state thermal circuit model is used to describe the temperature distribution and heat flow change of the cable in the stable working state. Illustratively, the structural composition of the non-coaxial high-voltage cable refers to the layer structure of the non-coaxial high-voltage cable. Usually, the non-coaxial high-voltage cable includes a cable core and other layer structures covering the cable core, such as an insulation layer, a protective layer, etc., which are not limited in the present embodiment. The heat generated by the cable core of the high-voltage cable is transmitted outward layer by layer through the layer structure, and thus the steady-state thermal circuit model of the non-coaxial high-voltage cable filled with the repair liquid can be constructed.

[0052] For example, in some embodiments of the present invention, a non-coaxial high-voltage cable includes a cable core, an insulation layer enclosing the cable core, a buffer layer enclosing the insulation layer, a metal sheath enclosing the buffer layer, and an outer sheath enclosing the metal sheath. The buffer layer and the metal sheath have an air gap layer, and the buffer layer and the air gap layer together constitute an inner liner layer. A steady-state thermal circuit model is constructed for the heat flow of the cable core with respect to the cable core temperature, insulation layer temperature, insulation layer thermal resistance, inner liner layer filled with repair fluid thermal resistance, metal sheath temperature, outer sheath temperature, and outer sheath thermal resistance.

[0053] Figure 2 The circuit diagram of the steady-state thermal circuit model of the non-coaxial high-voltage cable filled with repair fluid provided by the present invention is as follows: Figure 2 As shown in the figure, θ0, θ 1， θ 2， θ 3， These represent the cable outer sheath temperature, cable metal (aluminum sheath in the diagram) temperature, cable insulation (XLPE insulation in the diagram) temperature, and cable core (conductor in the diagram) temperature, respectively, in °C; T1, T2', and T3 represent the thermal resistance of the cable outer sheath, the theoretical thermal resistance of the inner lining filled with repair fluid (repair fluid in the diagram), and the thermal resistance of the cable insulation, respectively, in K·m / W; Q represents the heat flux of the cable core, in W / m. Through mathematical modeling, Figure 2 The circuit shown is expressed through mathematical relationships, resulting in a steady-state thermal circuit model of the non-coaxial high-voltage cable.

[0054] S102. Calculate the theoretical thermal resistance of the inner lining filled with repair fluid based on the shape factor of the non-coaxial high-voltage cable.

[0055] In this embodiment of the invention, based on the analysis of the structure of non-coaxial cables and the heat transfer mode in different regions, and considering that non-coaxial cables must take into account the influence of different radial heat transfer of conductors when the shape is asymmetrical, a shape factor is introduced to calculate the theoretical thermal resistance of the inner lining filled with repair fluid. The shape factor is used to characterize the shape of the cross-section of the non-coaxial high-voltage cable.

[0056] For example, in some embodiments of the present invention, the shape factor of the non-coaxial high-voltage cable is calculated based on the equivalent inner radius of the inner liner, the equivalent radius of the inner surface of the metal sheath, and the eccentricity between the buffer layer and the metal sheath. Then, the theoretical thermal resistance of the inner liner filled with the repair fluid is calculated based on the shape factor of the non-coaxial high-voltage cable and the thermal conductivity of the repair fluid.

[0057] Figure 3 This invention provides a schematic diagram illustrating the relative positional relationship between the metal sheath and the inner lining layer in a non-coaxial high-voltage cable. Figure 3As shown, there is a certain thickness of air gap layer between the buffer layer and the metal sheath, due to the influence of gravity and the air gap layer, the geometric center of the inner liner portion of the cable and the geometric center of the metal sheath are different, and there is a certain eccentricity. The formula for calculating the form factor of the non-coaxial high-voltage cable is as follows:

[0058]

[0059] Wherein, S is the form factor of the non-coaxial high-voltage cable, r1 is the equivalent inner radius of the inner liner, r2 is the equivalent radius of the inner surface of the metal sheath, and e is the eccentricity of the buffer layer and the metal sheath.

[0060] The formula for calculating the theoretical thermal resistance of the inner liner filled with the repair liquid is as follows:

[0061]

[0062] Wherein, T2' is the theoretical thermal resistance of the inner liner filled with the repair liquid, λ2 is the thermal conductivity of the repair liquid, and S is the form factor of the non-coaxial high-voltage cable.

[0063] S103, according to the actual collected outer sheath temperature, metal sheath temperature and insulation layer temperature, combined with the steady-state thermal circuit model, the actual thermal resistance of the inner liner filled with the repair liquid is calculated.

[0064] In the actual application process, the outer sheath temperature, the metal sheath temperature and the insulation layer temperature of the non-coaxial high-voltage cable are collected, and the actual thermal resistance of the inner liner filled with the repair liquid is calculated according to the actual collected outer sheath temperature, metal sheath temperature and insulation layer temperature, combined with the steady-state thermal circuit model.

[0065] In the embodiment of the present application, the outer sheath temperature, the metal sheath temperature and the insulation layer temperature collected by the temperature sensor are used. Before using the temperature sensor to measure the temperature, connect the signal end of several temperature sensors to be used on the same monitoring device, and put the temperature measuring end into the same cup of 80-degree hot water. Read the readings on the monitoring device at this time. If there is a large deviation in the reading of the thermistor, it should be replaced in time to reduce the experimental error. In order to improve the measurement accuracy of the temperature sensor, tools are used to ensure that the temperature sensor is in close contact with the temperature measuring point. The signal end of the temperature sensor is connected to the data recording device to record the real-time temperature value of the cable surface. For temperature measurement of the metal sheath and the insulation layer, use a drill to punch holes to the outside of the metal sheath and the insulation layer respectively. The diameter of the hole should not be greater than 3mm, and the depth of the hole should be deep enough to reach the measured position and stably contact the metal structure. The outer sheath temperature, the metal sheath temperature and the insulation layer temperature of the cable are detected by using the temperature sensor and the data recording device.

[0066] In some embodiments of the present application, the heat flow of the cable core of the non-coaxial high-voltage cable is calculated according to the actually collected outer sheath temperature, metal sheath temperature and thermal resistance of the outer sheath, combined with the steady-state thermal circuit model. Based on the heat flow of the cable core of the non-coaxial high-voltage cable, the metal sheath temperature and the insulating layer temperature, combined with the steady-state thermal circuit model, the actual thermal resistance of the inner liner filled with the repair liquid is calculated.

[0067] For example, the calculation formula of the heat flow of the cable core of the non-coaxial high-voltage cable is as follows:

[0068]

[0069] Wherein, Q is the heat flow of the cable core of the non-coaxial high-voltage cable, θ1 is the metal sheath temperature, θ0 is the outer sheath temperature, and T1 is the thermal resistance of the outer sheath.

[0070] Wherein, the thermal resistance of the outer sheath can be calculated by IEC standard, and the calculation formula is as follows:

[0071]

[0072] Wherein, ρ T The thermal resistance coefficient of the insulating layer is K m / W; Dit is the diameter of the imaginary concentric cylinder tangent to the inner surface of the trough of the metal sheath, Doc is the diameter of the imaginary concentric cylinder tangent to the peak of the metal sheath, and the unit is mm. T1 is the thickness of the metal sheath, and t3 is the thickness of the outer sheath, and the unit is mm.

[0073] For example, the calculation formula of the actual thermal resistance of the inner liner filled with the repair liquid is as follows:

[0074]

[0075] Wherein, T2 is the actual thermal resistance, θ1 is the metal sheath temperature, θ2 is the insulating layer temperature, and Q is the heat flow of the cable core of the non-coaxial high-voltage cable.

[0076] S104, calculate the ratio of the actual thermal resistance to the theoretical thermal resistance, and obtain the filling degree of the non-coaxial high-voltage cable.

[0077] In the embodiments of the present application, the ratio of the actual thermal resistance to the theoretical thermal resistance is calculated to obtain the filling degree of the non-coaxial high-voltage cable. That is, the calculation formula of the filling degree of the non-coaxial high-voltage cable is as follows:

[0078]

[0079] Wherein, a is the filling degree of the non-coaxial high-voltage cable. The closer the value of a is to 1, the higher the filling degree of the repair liquid, and the more stable the subsequent cable during long-time operation.

[0080] The application provides a filling degree detection method of a non-coaxial high-voltage cable repair liquid, a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with the repair liquid is constructed based on the structural composition of the non-coaxial high-voltage cable, the theoretical thermal resistance of the inner lining layer filled with the repair liquid is calculated based on the shape factor of the non-coaxial high-voltage cable, the shape factor is used to represent the shape of the cross section of the non-coaxial high-voltage cable, the actual thermal resistance of the inner lining layer filled with the repair liquid is calculated according to the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, combined with the steady-state thermal circuit model, the ratio of the actual thermal resistance to the theoretical thermal resistance is calculated, and the filling degree of the non-coaxial high-voltage cable is obtained, so that the filling degree of the non-coaxial high-voltage cable repair liquid is accurately detected, and a basis for evaluating the stability of the cable in long-time operation is provided.

[0081] Figure 4 The structure diagram of the filling degree detection device of the non-coaxial high-voltage cable repair liquid provided by the application is shown as Figure 4 The filling degree detection device of the non-coaxial high-voltage cable repair liquid comprises:

[0082] The thermal circuit model construction module 201 is used to construct a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with the repair liquid based on the structural composition of the non-coaxial high-voltage cable.

[0083] The theoretical thermal resistance calculation module 202 is used to calculate the theoretical thermal resistance of the inner lining layer filled with the repair liquid based on the shape factor of the non-coaxial high-voltage cable, and the shape factor is used to represent the shape of the cross section of the non-coaxial high-voltage cable.

[0084] The actual thermal resistance calculation module 203 is used to calculate the actual thermal resistance of the inner lining layer filled with the repair liquid according to the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, combined with the steady-state thermal circuit model.

[0085] The filling degree calculation module 204 is used to calculate the ratio of the actual thermal resistance to the theoretical thermal resistance, and obtain the filling degree of the non-coaxial high-voltage cable.

[0086] In some embodiments of the application, the theoretical thermal resistance calculation module 202 comprises:

[0087] The shape factor calculation sub-module calculates the shape factor of the non-coaxial high-voltage cable based on the equivalent inner radius of the inner lining layer, the equivalent radius of the inner surface of the metal sheath and the eccentricity of the buffer layer and the metal sheath.

[0088] The theoretical thermal resistance calculation sub-module is used to calculate the theoretical thermal resistance of the inner lining layer filled with the repair liquid based on the shape factor of the non-coaxial high-voltage cable and the thermal conductivity coefficient of the repair liquid.

[0089] In some embodiments of the application, the calculation formula of the shape factor of the non-coaxial high-voltage cable is as follows:

[0090]

[0091] wherein S is a shape factor of the non-coaxial high-voltage cable, r1 is an equivalent radius of an outer surface of the inner liner, r2 is an equivalent radius of an inner surface of the metal sheath, and e is an eccentricity of the inner liner relative to the metal sheath.

[0092] In some embodiments of the present application, a calculation formula of the theoretical thermal resistance of the inner liner filled with the repair liquid is:

[0093]

[0094] wherein T2' is the theoretical thermal resistance, λ2 is a thermal conductivity of the repair liquid, and S is the shape factor of the non-coaxial high-voltage cable.

[0095] In some embodiments of the present application, the actual thermal resistance calculation module 203 comprises:

[0096] a heat generation heat flow calculation sub-module, configured to calculate a heat generation heat flow of the cable core of the non-coaxial high-voltage cable according to the actually collected outer sheath temperature, the metal sheath temperature and the thermal resistance of the outer sheath, and in combination with the steady-state thermal circuit model;

[0097] an actual thermal resistance calculation sub-module, configured to calculate an actual thermal resistance of the inner liner filled with the repair liquid based on the heat generation heat flow of the cable core of the non-coaxial high-voltage cable, the metal sheath temperature and the insulation layer temperature, and in combination with the steady-state thermal circuit model.

[0098] In some embodiments of the present application, a calculation formula of the heat generation heat flow of the cable core of the non-coaxial high-voltage cable is:

[0099]

[0100] wherein Q is the heat generation heat flow of the cable core of the non-coaxial high-voltage cable, θ1 is the metal sheath temperature, θ0 is the outer sheath temperature, and T1 is the thermal resistance of the outer sheath.

[0101] In some embodiments of the present application, a calculation formula of the actual thermal resistance of the inner liner filled with the repair liquid is:

[0102]

[0103] wherein T2 is the actual thermal resistance, θ1 is the metal sheath temperature, θ2 is the insulation layer temperature, and Q is the heat generation heat flow of the cable core of the non-coaxial high-voltage cable.

[0104] The filling degree detection device of the non-coaxial high-voltage cable repair liquid can execute the filling degree detection method of the non-coaxial high-voltage cable repair liquid provided by the foregoing embodiments of the application, and has corresponding function modules and beneficial effects for executing the filling degree detection method of the non-coaxial high-voltage cable repair liquid.

[0105] Figure 5 A block diagram of an electronic device is provided. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital assistants, cellular telephones, smart phones, wearable devices (e.g., headgear, eyewear, watches, etc.), and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the applications described and / or claimed in this document.

[0106] As shown in Figure 5 The electronic device includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., connected to the at least one processor 11 in communication, where the memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer programs stored in the read-only memory (ROM) 12 or loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for operation of the electronic device can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0107] Various components in the electronic device are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, a speaker, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunications networks.

[0108] The processor 11 can be various general and / or special purpose processing components having processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs various methods and processes described above, such as the filling degree detection method of the non-coaxial high-voltage cable repair liquid.

[0109] In some embodiments, the filling degree detection method of the non-coaxial high-voltage cable repair liquid can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device via the ROM 12 and / or the communication unit 19. When the computer program is loaded onto the RAM 13 and executed by the processor 11, one or more steps of the filling degree detection method of the non-coaxial high-voltage cable repair liquid described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the filling degree detection method of the non-coaxial high-voltage cable repair liquid by any other appropriate means, such as by means of firmware.

[0110] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (PLD), a computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0111] Computer programs used to implement the methods of the application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the computer program, when executed by the processor of the machine, implements the functions / acts specified in the flowcharts and / or block diagrams. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as a stand-alone software package, partially on a machine and partially on a remote machine or entirely on a remote machine or server.

[0112] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store computer programs for use by or in connection with an instruction execution system, apparatus, or device. Computer-readable storage media can include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of a machine-readable storage medium will include one or more lines of electrical connections, portable computer disks, hard disk drives, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or Flash memory), optical fibers, portable compact disc read-only memories (CD-ROMs), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0113] To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0114] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), blockchain networks, and the Internet.

[0115] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. Servers can be cloud servers, also known as cloud computing servers or cloud hosts, which are a host product in the cloud computing service system to solve the defects of large management difficulty and weak business scalability in traditional physical hosts and VPS services.

[0116] The embodiment of the present application also provides a computer program product comprising a computer program which, when executed by a processor, implements the filling degree detection method of the non-coaxial high-voltage cable repair liquid as provided in any embodiment of the present application.

[0117] The computer program product can be written in one or more programming languages or combinations of languages including object-oriented languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0118] It should be understood that the various forms of flow shown above can be re-ordered, added to, or deleted from without departing from the scope of the present application. For example, the steps recited in the present application can be performed in parallel, in series, or in a different order, and the present application is not limited in this regard.

[0119] The specific embodiments described above are not intended to limit the scope of the present application. Those skilled in the art will understand that various modifications, combinations, sub-combinations, and alternatives can be made to the specific embodiments without departing from the spirit and principles of the present application. Any further modifications, equivalents, and / or alternatives come within the scope of the present application as recited by the claims.

Claims

1. A method of detecting the filling degree of a non-coaxial high-voltage cable repair fluid, characterized in that The method comprises the following steps: a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with the repair liquid is constructed based on the structural composition of the non-coaxial high-voltage cable; a shape factor of the non-coaxial high-voltage cable is calculated based on an equivalent inner radius of the inner liner, an equivalent radius of an inner surface of the metal sheath, and an eccentricity of the buffer layer and the metal sheath, the shape factor being used to represent a shape of a cross section of the non-coaxial high-voltage cable; a calculation formula of the shape factor of the non-coaxial high-voltage cable is as follows: wherein S is the shape factor of the non-coaxial high-voltage cable, r1 is the equivalent radius of the inner surface of the inner liner, r2 is the equivalent radius of the inner surface of the metal sheath, and e is the eccentricity; a theoretical thermal resistance of the inner liner filled with the repair liquid is calculated based on the shape factor of the non-coaxial high-voltage cable and a thermal conductivity of the repair liquid; an actual thermal resistance of the inner liner filled with the repair liquid is calculated according to actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, and in combination with the steady-state thermal circuit model; a ratio of the actual thermal resistance to the theoretical thermal resistance is calculated to obtain a filling degree of the non-coaxial high-voltage cable.

2. The method of claim 1, wherein A calculation formula of the theoretical thermal resistance of the inner liner filled with the repair liquid is as follows: wherein T2' is the theoretical thermal resistance, λ2 is the thermal conductivity of the repair liquid, and S is the shape factor of the non-coaxial high-voltage cable.

3. The method of claim 1 or 2, wherein the method is characterized by, The actual thermal resistance of the inner liner filled with the repair liquid is calculated according to actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, and in combination with the steady-state thermal circuit model, which comprises the following steps: a heat generation heat flow of a cable core of the non-coaxial high-voltage cable is calculated according to actually collected outer sheath temperature, metal sheath temperature and thermal resistance of the outer sheath, and in combination with the steady-state thermal circuit model; the actual thermal resistance of the inner liner filled with the repair liquid is calculated based on the heat generation heat flow of the cable core of the non-coaxial high-voltage cable, metal sheath temperature and insulation layer temperature, and in combination with the steady-state thermal circuit model.

4. The method of claim 3, wherein A calculation formula of the heat generation heat flow of the cable core of the non-coaxial high-voltage cable is as follows: wherein Q is the heat generation heat flow of the cable core of the non-coaxial high-voltage cable, θ1 is the metal sheath temperature, θ0 is the outer sheath temperature, and T1 is the thermal resistance of the outer sheath.

5. The method of claim 3, wherein the method is characterized by: A calculation formula of the actual thermal resistance of the inner liner filled with the repair liquid is as follows: wherein T2 is the actual thermal resistance, θ1 is the metal sheath temperature, θ2 is the insulation layer temperature, and Q is the heat generation heat flow of the cable core of the non-coaxial high-voltage cable.

6. A filling degree detecting device for a non-coaxial high voltage cable repair fluid, characterized in that The method comprises the following steps: a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with the repair liquid is constructed based on the structural composition of the non-coaxial high-voltage cable; a shape factor of the non-coaxial high-voltage cable is calculated based on an equivalent inner radius of the inner liner, an equivalent radius of an inner surface of the metal sheath, and an eccentricity of the buffer layer and the metal sheath, the shape factor being used to represent a shape of a cross section of the non-coaxial high-voltage cable; a calculation formula of the shape factor of the non-coaxial high-voltage cable is as follows: wherein S is the shape factor of the non-coaxial high-voltage cable, r1 is the equivalent radius of the inner surface of the inner liner, r2 is the equivalent radius of the inner surface of the metal sheath, and e is the eccentricity; a theoretical thermal resistance of the inner liner filled with the repair liquid is calculated based on the shape factor of the non-coaxial high-voltage cable and a thermal conductivity of the repair liquid; An actual thermal resistance calculation module is configured to calculate an actual thermal resistance of the inner lining filled with the repair liquid according to the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, and in combination with the steady-state thermal circuit model; An filling degree calculation module is configured to calculate a ratio of the actual thermal resistance to the theoretical thermal resistance to obtain the filling degree of the non-coaxial high-voltage cable.

7. An electronic device, comprising: The method comprises the steps of: one or more processors; a storage device configured to store one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the method for detecting the filling degree of the repair liquid of the non-coaxial high-voltage cable according to any one of claims 1-5.

8. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the method for detecting the filling degree of the repair liquid of the non-coaxial high-voltage cable according to any one of claims 1-5.

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