Method, device and equipment for detecting filling degree of non-coaxial high-voltage cable repair liquid and storage medium

Abstract

The invention discloses a non-coaxial high-voltage cable repair liquid filling degree detection method, device and equipment and a storage medium, and the method comprises the steps: building a steady-state thermal circuit model of a non-coaxial high-voltage cable filled with repair liquid based on the structural composition of the non-coaxial high-voltage cable; the theoretical thermal resistance of the lining layer filled with the repairing liquid is calculated based on the shape factor of the non-coaxial high-voltage cable, the shape factor is used for representing the shape of the cross section of the non-coaxial high-voltage cable, and according to the actually-collected outer sheath temperature, metal sheath temperature and insulating layer temperature, a steady-state thermal circuit model is combined to calculate the thermal resistance of the lining layer filled with the repairing liquid. The actual thermal resistance of the lining layer filled with the repairing liquid is calculated, the ratio of the actual thermal resistance to the theoretical thermal resistance is calculated, the filling degree of the non-coaxial high-voltage cable is obtained, and the filling degree of the repairing liquid of the non-coaxial high-voltage cable is accurately detected, so that a basis is provided for evaluating the stability of long-time operation of the cable.

Description

Technical Field

[0001] The invention relates to power cable technology, and in particular to a filling degree detection method, device, equipment and storage medium for a non-coaxial high-voltage cable repair fluid. Background Art

[0002] Combined with the actual laying environment of the cable, in order to prevent damage to the internal structure of the cable caused by bending of the cable during construction or laying, some cable manufacturers will leave a certain margin between the size matching of the buffer layer and the metal sheath, resulting in an air gap of a certain thickness between the buffer layer and the metal sheath. The structure composed of the buffer layer and the air gap layer is called the inner lining layer. 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 in various places. Studies have found that there are white spot defects at the contact point between the buffer layer and the metal sheath. The continued development of these defects will cause ablation discharge of the insulation shielding and even the main insulation. Therefore, when the buffer layer has white spots, it needs to be filled with repair fluid for repair.

[0003] For repaired cables, many studies have focused on testing the discharge capacity of the repaired inner lining, specifically by testing and comparing the partial discharge signal results of defective cables before and after repair to verify the effectiveness of the repair method. This solution fails to detect the filling degree of the repair fluid, which is an important parameter that affects the evaluation of the long-term stable operation of the cable. Summary of the invention

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

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

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

[0007] Calculating a theoretical thermal resistance of an inner lining layer filled with a repairing liquid based on a shape factor of the non-coaxial high-voltage cable, wherein the shape factor is used to characterize a shape of a cross section of the non-coaxial high-voltage cable;

[0008] According to the actually 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 lining layer filled with the repair fluid is calculated;

[0009] 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.

[0010] Optionally, calculating the theoretical thermal resistance of the inner lining layer filled with the repair fluid based on the shape factor of the non-coaxial high-voltage cable includes:

[0011] Calculating 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 between the buffer layer and the metal sheath;

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

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

[0014]

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

[0016] Optionally, the theoretical thermal resistance of the lining layer filled with the repair fluid is calculated as:

[0017]

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

[0019] Optionally, according to the actually 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 lining layer filled with the repair fluid is calculated, including:

[0020] Calculate the heat flow of the core of the non-coaxial high-voltage cable according to the actually collected outer sheath temperature, metal sheath temperature and thermal resistance of the outer sheath in combination with the steady-state thermal circuit model;

[0021] Based on the heat flux of the 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, the actual thermal resistance of the lining layer filled with the repair fluid is calculated.

[0022] Optionally, the calculation formula for the heat flux of the cable core of the non-coaxial high-voltage cable is:

[0023]

[0024] Among them, Q is the heat flux 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 actual thermal resistance of the lining layer filled with the repair fluid is calculated as:

[0026]

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

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

[0029] A thermal circuit model building module, used to build a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with a repair fluid based on the structural composition of the non-coaxial high-voltage cable;

[0030] A theoretical thermal resistance calculation module, used to calculate the theoretical thermal resistance of the inner lining layer filled with the repair fluid based on the shape factor of the non-coaxial high-voltage cable, wherein the shape factor is used to characterize the shape of the cross section of the non-coaxial high-voltage cable;

[0031] An actual thermal resistance calculation module, used to calculate the actual thermal resistance of the inner lining layer filled with the repair fluid according to the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, combined with the steady-state thermal circuit model;

[0032] The filling degree calculation module is used 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 invention further provides an electronic device, comprising:

[0034] one or more processors;

[0035] A storage device for storing 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 filling degree detection method of the non-coaxial high-voltage cable repair fluid as provided in the first aspect of the present invention.

[0037] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for detecting the filling degree of a non-coaxial high-voltage cable repair fluid as provided in the first aspect of the present invention.

[0038] The present invention provides a method for detecting the filling degree 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 an inner lining layer filled with the repair liquid is calculated based on a shape factor of the non-coaxial high-voltage cable. The shape factor is used to characterize the shape of the cross-section of the non-coaxial high-voltage cable. According to the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, in combination with the steady-state thermal circuit model, the actual thermal resistance of the inner lining layer filled with the repair liquid is calculated. 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. By accurately detecting the filling degree of the non-coaxial high-voltage cable repair liquid, a basis is provided for evaluating the stability of the cable during long-term operation.

[0039] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0041] Figure 1 A flow chart of a method for detecting the filling degree of a non-coaxial high-voltage cable repair fluid provided by the present invention;

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

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

[0044] Figure 4 A schematic structural diagram of a filling degree detection device for a non-coaxial high-voltage cable repair fluid provided by the present invention;

[0045] Figure 5 The present invention provides a schematic structural diagram of an electronic device.

[0046] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

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

[0049] Figure 1 The present invention provides a flow chart of a method for detecting the filling degree of a non-coaxial high-voltage cable repair liquid. The present embodiment can be applied to calculate the filling degree of a non-coaxial high-voltage cable repair liquid to accurately evaluate the stability of the cable during long-term operation. The method can be performed by a non-coaxial high-voltage cable repair liquid filling degree detection device provided by an embodiment of the present invention. The device can be implemented by software and / or hardware, and is usually configured in an electronic device, such as Figure 1 As shown, the filling degree detection method of the non-coaxial high-voltage cable repair fluid includes the following steps:

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

[0051] In an embodiment of the present invention, a steady-state thermal circuit model of a non-coaxial high-voltage cable filled with a repair fluid is constructed based on the structural composition of the non-coaxial high-voltage cable. In power cables, the steady-state thermal circuit model is used to describe the temperature distribution and heat flow changes of the cable under a stable working state. Exemplarily, the structural composition of the non-coaxial high-voltage cable refers to the layer structure of the non-coaxial high-voltage cable. Typically, the non-coaxial high-voltage cable includes a cable core and other layer structures covering the cable core, such as an insulating layer, a protective layer, etc., which are not limited in the embodiment of the present invention. The heat generated by the cable core of the high-voltage cable is transferred outward layer by layer through the layer structure, thereby constructing a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with a repair fluid.

[0052] Exemplarily, in some embodiments of the present invention, a non-coaxial high-voltage cable includes a cable core, an insulation layer wrapping the cable core, a buffer layer wrapping the insulation layer, a metal sheath wrapping the buffer layer, and an outer sheath wrapping 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 lining layer. A steady-state thermal circuit model of the heat flow of the cable core is constructed with respect to the cable core temperature, the insulation layer temperature, the thermal resistance of the insulation layer, the thermal resistance of the inner lining layer filled with a repair fluid, the metal sheath temperature, the outer sheath temperature, and the thermal resistance of the outer sheath.

[0053] Figure 2 A circuit diagram of a steady-state thermal circuit model of a non-coaxial high-voltage cable filled with a repair fluid provided by the present invention, such as Figure 2 As shown in the figure, θ0, θ 1， θ 2， θ 3， They are respectively the cable outer sheath temperature, cable metal (aluminum sheath in the figure) sheath temperature, cable insulation layer (XLPE insulation in the figure) temperature, cable core (conductor in the figure) temperature, in ℃; T1, T2', T3 are respectively the thermal resistance of the cable outer sheath, the theoretical thermal resistance of the inner lining filled with repair fluid (repair fluid in the figure), and the thermal resistance of the cable insulation layer, in K·m / W; Q is the heat flux of the cable core, in W / m. Through mathematical modeling, Figure 2 The circuit shown is expressed by means of a mathematical relationship, and a steady-state thermal circuit model of the non-coaxial high-voltage cable is obtained.

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

[0055] In an embodiment of the present invention, based on the analysis of the non-coaxial cable structure and the heat transfer modes in different areas, and taking into account that the non-coaxial cable must take into account the impact of different radial heat transfer of the conductor when the shape is asymmetric, a shape factor is introduced to calculate the theoretical thermal resistance of the inner lining layer filled with the repair fluid. The shape factor is used to characterize the shape of the cross-section of the non-coaxial high-voltage cable.

[0056] Exemplarily, 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 lining layer, the equivalent radius of the inner surface of the metal sheath, and the eccentricity between the buffer layer and the metal sheath, and then the theoretical thermal resistance of the inner lining layer 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 A schematic diagram of the relative position relationship between the metal sheath and the inner lining layer in a non-coaxial high voltage cable provided by the present invention is shown in FIG. Figure 3As shown, there is an air gap layer of a certain thickness between the buffer layer and the metal sheath. Due to the influence of gravity and the air gap layer, the geometric center of the cable part inside the inner lining layer is different from the geometric center of the metal sheath, and there is a certain eccentricity. The calculation formula for the shape factor of non-coaxial high-voltage cable is as follows:

[0058]

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

[0060] The theoretical thermal resistance of the lining layer filled with repair fluid is calculated as follows:

[0061]

[0062] Wherein, T2′ is the theoretical thermal resistance of the inner lining layer filled with the repair fluid, λ2 is the thermal conductivity of the repair fluid, and S is the shape factor of the non-coaxial high voltage cable.

[0063] S103, calculating the actual thermal resistance of the inner lining layer filled with the repair fluid according to the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature in combination with a steady-state thermal circuit model.

[0064] In actual application, the outer sheath temperature, metal sheath temperature and insulation layer temperature of the non-coaxial high-voltage cable are collected. Based on the actually 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 lining layer filled with the repair fluid is calculated.

[0065] In an embodiment of the present invention, the outer sheath temperature, metal sheath temperature and insulation layer temperature are collected by temperature sensors. Before using the temperature sensor to measure the temperature, connect the signal ends of several temperature sensors to be used to the same monitoring device, put the temperature measuring ends into the same cup of 80-degree hot water, and read the readings at this time on the monitoring device. If there is a large reading deviation, the thermal resistor should be replaced in time to reduce the experimental error. Based on the consideration of improving the measurement accuracy of the temperature sensor, a tool is 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 a data recording device to record the real-time temperature value of the cable surface. For the temperature measurement of the metal sheath and the insulation layer, an electric drill is used to drill 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 based on reaching the measured position and stably contacting the metal structure. The outer sheath temperature, metal sheath temperature and insulation layer temperature of the cable are detected using a temperature sensor and a data recording device.

[0066] In some embodiments of the present invention, the heat flux 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 a steady-state thermal circuit model. Based on the heat flux of the cable core of the non-coaxial high-voltage cable, the metal sheath temperature and the insulation layer temperature, combined with a steady-state thermal circuit model, the actual thermal resistance of the inner lining layer filled with the repair fluid is calculated.

[0067] Exemplarily, the calculation formula for the heat flux of the cable core of a non-coaxial high-voltage cable is:

[0068]

[0069] Among them, Q is the heat flux 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] Among them, the thermal resistance of the outer sheath can be calculated according to the IEC standard, and the calculation formula is as follows:

[0071]

[0072] Among them, ρ T Thermal resistance coefficient of the insulation layer, in km / W; Dit is the diameter of an imaginary concentric cylinder tangent to the inner surface of the metal sheath trough, Doc is the diameter of an imaginary concentric cylinder tangent to the metal sheath crest, in mm. ts is the thickness of the metal sheath, t3 is the thickness of the outer sheath, in mm.

[0073] Exemplarily, the actual thermal resistance of the lining layer filled with the repair fluid is calculated as follows:

[0074]

[0075] Among them, T2 is the actual thermal resistance, θ1 is the metal sheath temperature, θ2 is the insulation layer temperature, and Q is the heat flux 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 to obtain the filling degree of the non-coaxial high-voltage cable.

[0077] In the embodiment of the present invention, 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] Where 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 is, and the more stable the cable will be during long-term operation.

[0080] The present invention provides a method for detecting the filling degree 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 an inner lining layer filled with the repair liquid is calculated based on a shape factor of the non-coaxial high-voltage cable. The shape factor is used to characterize the shape of the cross-section of the non-coaxial high-voltage cable. According to the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, in combination with the steady-state thermal circuit model, the actual thermal resistance of the inner lining layer filled with the repair liquid is calculated. 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. By accurately detecting the filling degree of the non-coaxial high-voltage cable repair liquid, a basis is provided for evaluating the stability of the cable during long-term operation.

[0081] Figure 4 A schematic diagram of a filling degree detection device for a non-coaxial high-voltage cable repair fluid provided by the present invention is shown in FIG. Figure 4 As shown, the filling degree detection device of the non-coaxial high-voltage cable repair liquid includes:

[0082] A thermal circuit model building module 201 is used to build a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with a repair fluid based on the structural composition of the non-coaxial high-voltage cable;

[0083] A theoretical thermal resistance calculation module 202, for calculating the theoretical thermal resistance of the inner lining layer filled with the repair fluid based on the shape factor of the non-coaxial high-voltage cable, wherein the shape factor is used to characterize 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 fluid according to the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature in combination 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 to obtain the filling degree of the non-coaxial high-voltage cable.

[0086] In some embodiments of the present invention, the theoretical thermal resistance calculation module 202 includes:

[0087] A shape factor calculation submodule, which calculates the shape factor of the non-coaxial high-voltage cable based on an equivalent inner radius of the inner lining layer, an equivalent radius of the inner surface of the metal sheath, and an eccentricity between the buffer layer and the metal sheath;

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

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

[0090]

[0091] 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 lining layer, r2 is the equivalent radius of the inner surface of the metal sheath, and e is the eccentricity of the inner lining layer relative to the metal sheath.

[0092] In some embodiments of the present invention, the calculation formula of the theoretical thermal resistance of the lining layer filled with the repair liquid is:

[0093]

[0094] Wherein, T2′ is the theoretical thermal resistance, λ2 is the thermal conductivity of the repair fluid, and S is the shape factor of the non-coaxial high-voltage cable.

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

[0096] A heat flow calculation submodule, for calculating the heat flow of the core of the non-coaxial high-voltage cable according to the actually collected outer sheath temperature, metal sheath temperature and thermal resistance of the outer sheath, in combination with the steady-state thermal circuit model;

[0097] The actual thermal resistance calculation submodule is used to calculate the actual thermal resistance of the lining layer filled with the repair fluid based on the heat flux of the cable core, the metal sheath temperature and the insulation layer temperature of the non-coaxial high-voltage cable in combination with the steady-state thermal circuit model.

[0098] In some embodiments of the present invention, the calculation formula for the heat flux of the cable core of the non-coaxial high-voltage cable is:

[0099]

[0100] Among them, Q is the heat flux 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 invention, the actual thermal resistance of the lining layer filled with the repair fluid is calculated as follows:

[0102]

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

[0104] The above-mentioned non-coaxial high-voltage cable repair liquid filling degree detection device can execute the non-coaxial high-voltage cable repair liquid filling degree detection method provided by the aforementioned embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the non-coaxial high-voltage cable repair liquid filling degree detection method.

[0105] Figure 5 A schematic diagram of the structure of an electronic device provided by the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0106] like Figure 5 As shown, the electronic device includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the 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] A number of 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, speakers, etc.; a storage unit 18, such as a 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 telecommunication networks.

[0108] The processor 11 may be a variety of general and / or special processing components with 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 special 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 executes the various methods and processes described above, such as a filling degree detection method for a non-coaxial high-voltage cable repair fluid.

[0109] In some embodiments, the filling degree detection method of the non-coaxial high-voltage cable repair fluid can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device via the ROM 12 and / or the communication unit 19. When the computer program is loaded into 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 fluid 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 fluid by any other appropriate means (for example, by means of firmware).

[0110] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0111] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0112] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0113] To provide interaction with a user, the systems and techniques described herein may 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 trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0114] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may 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), a blockchain network, and the Internet.

[0115] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

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

[0117] In the process of implementation, the computer program product can be written in one or more programming languages ​​or a combination thereof to perform the computer program code of the present invention, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, 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 can be connected to an external computer (for example, using an Internet service provider to connect through the Internet).

[0118] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0119] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting the filling degree of a non-coaxial high-voltage cable repair fluid, characterized in that: include: Constructing a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with a repair fluid based on the structural composition of the non-coaxial high-voltage cable; Calculating a theoretical thermal resistance of an inner lining layer filled with a repairing liquid based on a shape factor of the non-coaxial high-voltage cable, wherein the shape factor is used to characterize a shape of a cross section of the non-coaxial high-voltage cable; According to the actually 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 lining layer filled with the repair fluid is calculated; 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.

2. The filling degree detection method of the non-coaxial high-voltage cable repair liquid according to claim 1 is characterized in that: The theoretical thermal resistance of the inner lining layer filled with the repair fluid is calculated based on the shape factor of the non-coaxial high voltage cable, including: Calculating 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 between the buffer layer and the metal sheath; The theoretical thermal resistance of the inner lining layer filled with the repairing liquid is calculated based on the shape factor of the non-coaxial high voltage cable and the thermal conductivity of the repairing liquid.

3. The filling degree detection method of the non-coaxial high-voltage cable repair liquid according to claim 2 is characterized in that: The 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 lining layer, r2 is the equivalent radius of the inner surface of the metal sheath, and e is the eccentricity.

4. The filling degree detection method of the non-coaxial high-voltage cable repair liquid according to claim 2 is characterized in that: The theoretical thermal resistance of the lining layer filled with repair fluid is calculated as follows: Wherein, T2′ is the theoretical thermal resistance, λ2 is the thermal conductivity of the repair fluid, and S is the shape factor of the non-coaxial high-voltage cable.

5. The filling degree detection method of the non-coaxial high-voltage cable repair liquid according to any one of claims 1 to 4 is characterized in that: According to the actually 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 lining layer filled with the repair fluid is calculated, including: Calculate the heat flow of the core of the non-coaxial high-voltage cable according to the actually collected outer sheath temperature, metal sheath temperature and thermal resistance of the outer sheath in combination with the steady-state thermal circuit model; Based on the heat flux of the 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, the actual thermal resistance of the lining layer filled with the repair fluid is calculated.

6. The filling degree detection method of non-coaxial high-voltage cable repair liquid according to claim 5 is characterized in that: The calculation formula for the heat flux of the cable core of the non-coaxial high-voltage cable is: Among them, Q is the heat flux 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.

7. The method for detecting the filling degree of a non-coaxial high-voltage cable repair liquid according to claim 5, characterized in that: The actual thermal resistance of the lining filled with repair fluid is calculated as: Among them, T2 is the actual thermal resistance, θ1 is the metal sheath temperature, θ2 is the insulation layer temperature, and Q is the heat flux of the cable core of the non-coaxial high-voltage cable.

8. A filling degree detection device for non-coaxial high-voltage cable repair fluid, characterized in that: include: A thermal circuit model building module, used to build a steady-state thermal circuit model of the non-coaxial high-voltage cable filled with a repair fluid based on the structural composition of the non-coaxial high-voltage cable; A theoretical thermal resistance calculation module, used to calculate the theoretical thermal resistance of the inner lining layer filled with the repair fluid based on the shape factor of the non-coaxial high-voltage cable, wherein the shape factor is used to characterize the shape of the cross section of the non-coaxial high-voltage cable; An actual thermal resistance calculation module, used to calculate the actual thermal resistance of the inner lining layer filled with the repair fluid according to the actually collected outer sheath temperature, metal sheath temperature and insulation layer temperature, combined with the steady-state thermal circuit model; The filling degree calculation module is used 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.

9. An electronic device, characterized in that: include: one or more processors; A storage device for storing 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 filling degree detection method of the non-coaxial high-voltage cable repair fluid as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the filling degree detection method of the non-coaxial high-voltage cable repair liquid as described in any one of claims 1-7 is implemented.

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