Cable joint filling method and device, cable joint, computer program product

Abstract

The present invention discloses a cable joint filling method and device, a cable joint, and a computer program product. The method includes: determining the initial thickness combination of each layer of filling material in the cable joint; performing fault simulation on the cable joint using a simulation model to analyze the current maximum stress of the copper shell and obtain an analysis result; when the analysis result indicates that the current maximum stress has not reached the optimal stress, adjusting the thickness of each layer of filling material to obtain the current thickness combination of each layer of filling material; updating the initial thickness combination to the current thickness combination; repeating the above steps until the current maximum stress reaches the optimal stress, determining the initial thickness combination as the optimal thickness combination; and filling each filling material into the cable joint according to the optimal thickness combination. The present invention solves the technical problem in the related art that the traditional method of avoiding fire caused by flash explosion of the cable joint by adding an external protective device has complex installation and poor convenience.

Description

Technical Field

[0001] The present invention relates to the field of cable joint safety technology, and in particular to a cable joint filling method and device, a cable joint, and a computer program product. Background Art

[0002] In recent years, with the rapid expansion of cable projects in urban underground power grids, power plants, substations and other places, the failure frequency of high-voltage power cables and their joints has gradually increased, seriously affecting the safe and reliable operation of the power grid. Some major power grid accidents often occur due to cable failures, which have caused huge losses to the economy and have serious social impacts. Cable joints are the weak link in the operation of high-voltage power cables. Once a failure occurs, it may cause serious power accidents, such as breakdown and explosion.

[0003] When a short circuit occurs in the cable joint, the arc breaks through the prefabricated parts and the filling materials, and finally penetrates the copper shell and causes an explosion. In the process of the arc breaking through the prefabricated parts, the prefabricated parts and the filling materials undergo thermal cracking; the prefabricated parts are usually made of silicone rubber or ethylene propylene rubber, and the filling materials are mostly epoxy resins, and their pyrolysis products include methane, ethane, ethylene, propane, propylene, isobutane, n-butane, hydrogen, carbon monoxide and carbon dioxide; under the action of the high-temperature arc, the large molecular alkane gas will continue to be pyrolyzed into small molecular gases such as hydrogen and methane; flammable gases such as methane, carbon monoxide, and hydrogen will expand under the heating of the high-temperature arc and form a high-temperature and high-pressure plasma together with the arc. Once the copper shell of the cable joint explodes, these flammable and explosive gases will rapidly expand in the cable tunnel and fully mix with the air; when the flammable and explosive gases diffuse to a certain extent and fully contact with oxygen, a flash explosion will occur. This flash explosion will ignite the cables and other combustibles around the cable joint, thereby causing a fire in the cable tunnel.

[0004] At present, the explosion-proof and fire-proof measures for the explosion problem of 220kV cable intermediate joints are mainly to add protective devices to the joints. Although these protective devices have excellent explosion-proof and fire-proof properties, the addition of protective devices will affect the heat dissipation of the joints and reduce the current carrying capacity of the cable. In addition, the devices are large in size, which increases the cost and brings inconvenience to the construction.

[0005] The traditional method of using an external protective device to prevent fires caused by flash explosions in cable joints in the above-mentioned related technologies has the problems of complex installation and poor convenience, and no effective solution has been proposed so far. Summary of the invention

[0006] The embodiments of the present invention provide a cable joint filling method and device, a cable joint, and a computer program product, so as to at least solve the technical problems in the related art that the traditional method of using an external protective device to avoid fire caused by flash explosion in the cable joint has complex installation and poor convenience.

[0007] According to one aspect of an embodiment of the present invention, a cable joint filling method is provided, comprising: a determination step of determining an initial thickness combination of filling materials in each layer of a cable joint, wherein the cable joint is used to connect a cable and / or connect the cable to an electrical device, the filling material comprises magnesium oxide, Kevlar fiber and air filled between a preform and a copper shell of the cable joint, the preform is used to seal the cable joint, the copper shell is a metal shell of the cable joint, and the initial thickness combination is a combination of the initial thicknesses of a magnesium oxide layer, a Kevlar fiber layer and an air layer; a first acquisition step of performing a fault simulation on the cable joint using a simulation model to analyze the current maximum stress of the copper shell in the cable joint to obtain an analysis result, wherein the current maximum stress is the maximum stress of the copper shell at The thickness combination of each layer of the filling material is the maximum value of the stress borne when the thickness combination of the filling material is the initial thickness combination; a second acquisition step, when the analysis result indicates that the current maximum stress has not reached the optimal stress, adjusting the thickness of each layer of the filling material to obtain the current thickness combination of each layer of the filling material, wherein the optimal stress is the maximum stress value borne by the copper shell when the constraint conditions are met; an updating step, updating the initial thickness combination to the current thickness combination; repeating the determining step, the first acquiring step, the second acquiring step and the updating step until the initial thickness combination is determined to be the optimal thickness combination when the current maximum stress reaches the optimal stress; filling each of the filling materials into the cable joint according to the optimal thickness combination.

[0008] Optionally, determining the initial thickness combination of each layer of filling material in the cable joint includes: obtaining the filling thickness between the preform and the copper shell in the cable joint; determining a first predetermined thickness as the first initial thickness of the magnesium oxide layer, wherein the magnesium oxide layer is a first filling layer filled with the magnesium oxide; determining a second predetermined thickness as the second initial thickness of the Kevlar fiber layer, wherein the Kevlar fiber layer is a second filling layer filled with the Kevlar fiber; determining a third predetermined thickness as the third initial thickness of the air layer, wherein the sum of the first predetermined thickness, the second predetermined thickness and the third predetermined thickness is the same as the filling thickness, the magnesium oxide layer is located above the preform, the Kevlar fiber layer is located above the magnesium oxide layer, and the air layer is located above the Kevlar fiber layer and below the copper shell; determining a combination of the first initial thickness, the second initial thickness and the third initial thickness as the initial thickness combination.

[0009] Optionally, before performing fault simulation on the cable joint using a simulation model to analyze the current maximum stress of the copper shell in the cable joint and obtaining the analysis result, the cable joint filling method also includes: obtaining the physical structure and material properties of the cable joint; inputting the physical structure and the material properties into finite element software to construct the simulation model using the finite element software; determining the boundary conditions for performing fault simulation on the cable joint according to the safety standards that the cable joint needs to meet and the explosion-proof performance that needs to be achieved, wherein the boundary conditions are used to constrain the simulation process.

[0010] Optionally, a simulation model is used to perform fault simulation on the cable joint to analyze the current maximum stress of the copper shell in the cable joint to obtain an analysis result, including: using the simulation model to perform fault simulation on the cable joint to obtain a simulation result; and using finite element software to analyze the stress currently borne by the copper shell according to the simulation result to determine the current maximum stress currently borne by the copper shell.

[0011] Optionally, when the analysis result indicates that the current maximum stress has not reached the optimal stress, the thickness of each layer of the filling material is adjusted, including: when the analysis result indicates that the current maximum stress is greater than the optimal stress, increasing the Kevlar fiber layer in the filling material by a first preset thickness, wherein the Kevlar fiber layer is a layer of the filling material in the filling material; when the analysis result indicates that the current maximum stress is less than the optimal stress, reducing the Kevlar fiber layer by a second preset thickness, wherein the first preset thickness and the second preset thickness are both determined by a first difference between the current maximum stress and the optimal stress.

[0012] Optionally, the thickness of each layer of the filling material is adjusted, including: obtaining a simulation result of a fault simulation of the cable joint; when the simulation result indicates that the fire resistance of the cable joint is lower than a fire resistance threshold, increasing the magnesium oxide layer in the filling material by a third preset thickness, wherein the third preset thickness is determined by a second difference between the fire resistance and the fire resistance threshold, and the magnesium oxide layer is a layer of the filling material in the filling material; when the simulation result indicates that the buffering performance of the cable joint is lower than the buffering performance threshold, increasing the air layer in the filling material by a fourth preset thickness, wherein the fourth preset thickness is determined by a third difference between the buffering performance and the buffering performance.

[0013] According to another aspect of an embodiment of the present invention, a cable joint filling device is also provided, comprising: a first determining unit, configured to execute a determining step, determining an initial thickness combination of each layer of filling material in the cable joint, wherein the cable joint is used to connect a cable and / or connect the cable to an electrical device, the filling material comprises magnesium oxide, Kevlar fiber and air filled between a preform and a copper shell of the cable joint, the preform is used to seal the cable joint, the copper shell is a metal shell of the cable joint, and the initial thickness combination is a combination of the initial thickness of the magnesium oxide layer, the Kevlar fiber layer and the air layer; a first acquiring unit, configured to execute a first acquiring step, performing a fault simulation on the cable joint using a simulation model, so as to analyze the current maximum stress of the copper shell in the cable joint, and obtain an analysis result, wherein the current maximum stress is the stress of the copper shell in each layer of the filling material. a second acquisition unit, for executing a second acquisition step, and when the analysis result indicates that the current maximum stress has not reached the optimal stress, adjusting the thickness of each layer of the filling material to obtain the current thickness combination of each layer of the filling material, wherein the optimal stress is the maximum stress value borne by the copper shell when the constraint conditions are met; an updating unit, for executing an updating step, updating the initial thickness combination to the current thickness combination; a second determining unit, for repeatedly executing the determining step, the first acquisition step, the second acquisition step and the updating step, until the initial thickness combination is determined to be the optimal thickness combination when the current maximum stress reaches the optimal stress; a filling unit, for filling each of the filling materials into the cable joint according to the optimal thickness combination.

[0014] Optionally, the first determination unit includes: a first acquisition module, used to obtain the filling thickness between the preform and the copper shell in the cable joint; a first determination module, used to determine that the first predetermined thickness is the first initial thickness of the magnesium oxide layer, wherein the magnesium oxide layer is a first filling layer filled with the magnesium oxide; a second determination module, used to determine that the second predetermined thickness is the second initial thickness of the Kevlar fiber layer, wherein the Kevlar fiber layer is a second filling layer filled with the Kevlar fiber; a third determination module, used to determine that the third predetermined thickness is the third initial thickness of the air layer, wherein the sum of the first predetermined thickness, the second predetermined thickness and the third predetermined thickness is the same as the filling thickness, the magnesium oxide layer is located above the preform, the Kevlar fiber layer is located above the magnesium oxide layer, and the air layer is located above the Kevlar fiber layer and below the copper shell; a fourth determination module, used to determine that the combination of the first initial thickness, the second initial thickness and the third initial thickness is the initial thickness combination.

[0015] Optionally, the cable joint filling device also includes: a third acquisition unit, used to obtain the physical structure and material properties of the cable joint before performing fault simulation on the cable joint using a simulation model to analyze the current maximum stress of the copper shell in the cable joint and obtain the analysis result; a construction unit, used to input the physical structure and the material properties into finite element software to construct the simulation model using the finite element software; a third determination unit, used to determine the boundary conditions for fault simulation of the cable joint according to the safety standards that the cable joint needs to meet and the explosion-proof performance that needs to be achieved, wherein the boundary conditions are used to constrain the simulation process.

[0016] Optionally, the first acquisition unit includes: a second acquisition module, used to use the simulation model to perform fault simulation on the cable joint to obtain simulation results; a fifth determination module, used to use finite element software to analyze the stress currently borne by the copper shell according to the simulation results to determine the current maximum stress currently borne by the copper shell.

[0017] Optionally, the second acquisition unit includes: a first adjustment module, used to increase the Kevlar fiber layer in the filling material by a first preset thickness when the analysis result indicates that the current maximum stress is greater than the optimal stress, wherein the Kevlar fiber layer is a layer of the filling material; a second adjustment module, used to reduce the Kevlar fiber layer by a second preset thickness when the analysis result indicates that the current maximum stress is less than the optimal stress, wherein the first preset thickness and the second preset thickness are both determined by a first difference between the current maximum stress and the optimal stress.

[0018] Optionally, the second acquisition unit includes: a third acquisition module, used to obtain a simulation result of fault simulation of the cable joint; a third adjustment module, used to increase the magnesium oxide layer in the filling material by a third preset thickness when the simulation result indicates that the fire resistance of the cable joint is lower than the fire resistance threshold, wherein the third preset thickness is determined by the second difference between the fire resistance and the fire resistance threshold, and the magnesium oxide layer is a layer of the filling material in the filling material; a fourth adjustment module, used to increase the air layer in the filling material by a fourth preset thickness when the simulation result indicates that the buffering performance of the cable joint is lower than the buffering performance threshold, wherein the fourth preset thickness is determined by the third difference between the buffering performance and the buffering performance.

[0019] According to another aspect of an embodiment of the present invention, a cable joint is further provided, wherein the cable joint uses any one of the above-mentioned cable joint filling methods.

[0020] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, wherein the computer-readable storage medium includes a stored program, wherein the program executes any one of the above-mentioned cable joint filling methods.

[0021] According to another aspect of an embodiment of the present invention, a processor is further provided, wherein the processor is used to run a program, wherein the program executes any one of the above-mentioned cable joint filling methods when running.

[0022] According to another aspect of an embodiment of the present invention, a computer program product is further provided, comprising computer instructions, wherein when the computer instructions are executed by a processor, any one of the above-mentioned cable joint filling methods is executed.

[0023] In an embodiment of the present invention, a determining step is performed to determine an initial thickness combination of each layer of filling material in a cable joint, wherein the cable joint is used to connect a cable and / or connect a cable to an electrical device, the filling material comprises magnesium oxide, Kevlar fiber and air filled between a preform and a copper shell of the cable joint, the preform is used to seal the cable joint, the copper shell is a metal shell of the cable joint, and the initial thickness combination is a combination of the initial thickness of the magnesium oxide layer, the Kevlar fiber layer and the air layer; a first acquiring step is performed to perform a fault simulation on the cable joint using a simulation model to analyze the current maximum stress of the copper shell in the cable joint to obtain an analysis result, wherein the current maximum stress is the stress of the copper shell in each layer of filling material. The thickness combination of the material is the maximum value of the stress borne when the thickness combination of the material is the initial thickness combination; the second acquisition step, when the analysis result indicates that the current maximum stress has not reached the optimal stress, the thickness of each layer of filling material is adjusted to obtain the current thickness combination of each layer of filling material, wherein the optimal stress is the maximum stress value borne by the copper shell when the constraint conditions are met; the updating step, updating the initial thickness combination to the current thickness combination; repeating the determination step, the first acquisition step, the second acquisition step and the updating step until the current maximum stress reaches the optimal stress, the initial thickness combination is determined to be the optimal thickness combination; filling each filling material into the cable joint according to the optimal thickness combination. Through the above technical scheme, the purpose of continuously testing the optimal thickness combination of each layer of filling material by simulation and filling each filling material into the cable joint according to the optimal thickness combination is achieved, and the technical effect of avoiding fire caused by flash explosion of the cable joint by selecting fire-resistant and explosion-proof filling materials to fill the cable joint is achieved, and the safety, convenience and easy installation of the cable joint are improved, thereby solving the technical problem that the traditional method of avoiding fire caused by flash explosion of the cable joint by adding an external protective device in the related art is complicated to install and has poor convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 It is a hardware structure block diagram of a mobile terminal of a cable joint filling method according to an embodiment of the present invention;

[0026] Figure 2 is a flow chart of a cable joint filling method according to an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of a filling material in a cable joint according to an embodiment of the present invention;

[0028] Figure 4 is a flow chart of a cable joint filling method according to an embodiment of the present invention;

[0029] Figure 5 is a flow chart of performing fault simulation on a cable connector according to an embodiment of the present invention;

[0030] Figure 6 is a schematic diagram of performing fault simulation on a cable connector according to an embodiment of the present invention;

[0031] Figure 7 is a schematic diagram of a cable joint filling device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] As introduced in the background technology, the conventional method of preventing fires caused by flash explosions in cable joints by adding external protective devices in the related art is complicated to install and less convenient. In view of the above defects, a cable joint filling method and device, a cable joint, and a computer program product are provided in the embodiments of the present invention.

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] The method embodiments provided in the embodiments of the present invention can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1FIG. 1 is a hardware structure block diagram of a mobile terminal of a cable joint filling method according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0037] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the cable joint filling method in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The above-mentioned network specific example may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0038] According to an embodiment of the present invention, a method embodiment of a cable joint filling method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0039] Figure 2is a flow chart of a cable joint filling method according to an embodiment of the present invention. Figure 2 As shown, the method comprises the following steps:

[0040] Step S202, a determination step, determines an initial thickness combination of each layer of filling material in a cable joint, wherein the cable joint is used to connect cables and / or connect cables to electrical equipment, the filling material includes magnesium oxide, Kevlar fiber and air filled between a preform and a copper shell of the cable joint, the preform is used to seal the cable joint, the copper shell is a metal shell of the cable joint, and the initial thickness combination is a combination of the initial thicknesses of the magnesium oxide layer, the Kevlar fiber layer and the air layer.

[0041] In this embodiment, an initial thickness combination of each layer of filling materials when filling multiple filling materials into a cable joint can be preliminarily determined, and then experiments are continuously performed through simulation to obtain an optimal thickness combination that can enable the cable joint to achieve the best explosion-proof and fire-proof performance as much as possible while complying with safety standards.

[0042] According to the above embodiment of the present invention, in the above step S202, the initial thickness combination of each layer of filling material in the cable joint is determined, including: obtaining the filling thickness between the preform and the copper shell in the cable joint; determining the first predetermined thickness as the first initial thickness of the magnesium oxide layer, wherein the magnesium oxide layer is the first filling layer filled with magnesium oxide; determining the second predetermined thickness as the second initial thickness of the Kevlar fiber layer, wherein the Kevlar fiber layer is the second filling layer filled with Kevlar fiber; determining the third predetermined thickness as the third initial thickness of the air layer, wherein the sum of the first predetermined thickness, the second predetermined thickness and the third predetermined thickness is the same as the filling thickness, the magnesium oxide layer is located above the preform, the Kevlar fiber layer is located above the magnesium oxide layer, and the air layer is located above the Kevlar fiber layer and below the copper shell; determining the combination of the first initial thickness, the second initial thickness and the third initial thickness as the initial thickness combination.

[0043] Combine the following Figure 3 The above embodiments of the present invention are described in detail. Figure 3 is a schematic diagram of a filling material in a cable joint according to an embodiment of the present invention.

[0044] like Figure 3As shown, in this embodiment, the traditional filling glue is no longer used as the filling material between the preform and the copper shell in the cable joint. Instead, magnesium oxide is used for filling, and a layer of Kevlar fiber is coated on the outside of the magnesium oxide. A certain thickness of air is reserved between the Kevlar fiber and the copper shell, so that magnesium oxide, Kevlar fiber and air are used as filling materials to fill the preform and the copper shell of the cable joint. Since magnesium oxide not only has good insulation but also has good flame retardancy, magnesium oxide can not only sublimate quickly and absorb heat, but magnesium oxide molecules can also react with active groups in the pyrolysis products of the preform to catalyze hydrogen and oxygen free radicals into water. By continuously simulating and determining the optimal thickness combination of the three filling materials, the fire and explosion resistance of the cable joint can be greatly improved.

[0045] Step S204, a first acquisition step, performs fault simulation on the cable joint using a simulation model to analyze the current maximum stress of the copper shell in the cable joint to obtain an analysis result, wherein the current maximum stress is the maximum value of the stress borne by the copper shell when the thickness combination of each layer of filling material is the initial thickness combination.

[0046] Generally speaking, when a short circuit occurs in a cable joint, the electric arc will break through the prefabricated parts and the filling materials, and finally penetrate the copper shell to cause an explosion. In the process of the electric arc breaking through the prefabricated parts, the prefabricated parts and the filling materials undergo thermal cracking. The prefabricated parts are usually made of silicone rubber or EPDM rubber, and the filling materials are mostly epoxy resins. The pyrolysis products include methane, ethane, ethylene, propane, propylene, isobutane, n-butane, hydrogen, carbon monoxide and carbon dioxide. Under the action of the high-temperature electric arc, the large molecular alkane gas will continue to be pyrolyzed into small molecular gases such as hydrogen and methane. The flammable gases such as methane, carbon monoxide and hydrogen expand under the heating of the high-temperature electric arc and form a high-temperature and high-pressure plasma together with the electric arc. Once the copper shell of the cable joint explodes, these flammable and explosive gases will rapidly expand in the cable tunnel and fully mix with the air. When the flammable and explosive gases diffuse to a certain extent and fully contact with oxygen, a flash explosion will occur. This flash explosion will ignite the cables and other combustibles around the cable joint, thereby causing a fire in the cable tunnel.

[0047] In this embodiment, magnesium oxide, Kevlar fiber and air are used as filling materials to fill between the preform and the copper shell of the cable joint, which has the following advantages: 1) magnesium oxide has excellent insulation and flame retardancy, can quickly sublimate at high temperature and absorb a large amount of heat, which helps to reduce the temperature of the cable joint and reduce the generation of pyrolysis products; 2) magnesium oxide molecules can also react with active groups in the pyrolysis products of the preform, catalyzing hydrogen and oxygen free radicals into water, further reducing the concentration of combustible gas inside the cable joint, thereby effectively suppressing the risk of gas explosion; 3) Kevlar fiber has high strength and toughness, which can When a short circuit occurs in the cable joint, it absorbs the impact force of the high-temperature and high-pressure gas generated by the electric arc to prevent the copper shell from bursting due to excessive pressure; 4) The existence of the Kevlar layer provides a deformation space for the high-pressure gas, avoiding the direct effect of the gas on the copper shell, thereby improving the explosion-proof performance of the cable joint; 5) A certain thickness of air layer is reserved between the Kevlar fiber and the copper shell of the cable joint, which can serve as a buffer zone to reduce the direct impact of the high-pressure gas on the copper shell; 6) The existence of the air layer also provides a deformation space for the Kevlar fiber, so that it will not immediately contact the copper shell when absorbing the impact, thereby avoiding the copper shell from bursting due to excessive force.

[0048] Therefore, the short-circuit fault simulation of the cable joint filled with magnesium oxide, Kevlar fiber and air can be carried out to analyze the optimal thickness combination that can make the copper shell reach the maximum stress as much as possible while meeting the safety standards.

[0049] According to the above embodiment of the present invention, before the above step S204, before using the simulation model to perform fault simulation on the cable joint to analyze the current maximum stress of the copper shell in the cable joint and obtaining the analysis result, the cable joint filling method also includes: obtaining the physical structure and material properties of the cable joint; inputting the physical structure and material properties into finite element software to construct a simulation model using finite element software; determining the boundary conditions for fault simulation of the cable joint according to the safety standards that the cable joint needs to meet and the explosion-proof performance that needs to be achieved, wherein the boundary conditions are used to constrain the simulation process.

[0050] Combine the following Figure 4 The above embodiments of the present invention are described in detail. Figure 4 is a flow chart of a cable joint filling method according to an embodiment of the present invention.

[0051] Specifically, Figure 4As shown, the physical structure and material properties of the cable joint can be input into the finite element software to construct a simulation model for simulating the short-circuit fault of the cable joint; in addition, in order to ensure the accuracy and feasibility of the simulation as much as possible, the boundary conditions of the simulation can be set according to the safety standards that the cable joint needs to meet and the explosion-proof performance that needs to be achieved, so as to constrain the simulation process, thereby ensuring that the cable joint filled with each filling material according to the final optimal thickness combination meets the safety standards and can achieve the best explosion-proof and fire-proof performance as much as possible; the boundary conditions set here may include but are not limited to: 1) Temperature boundary conditions: set the temperature of the surrounding environment of the cable joint, such as setting room temperature conditions or a specific high temperature environment; 2) Heat flow boundary conditions: simulate the heat flow of the cable joint when it is working, and set the boundary where the heat flow enters or leaves the joint; 3) Pressure Boundary conditions: When the cable joint is under pressure, set the magnitude and direction of the pressure; 4) Electric field boundary conditions: When considering the problem of arc breakdown, it is necessary to set the electric field strength and direction; 5) Material properties: Including physical properties such as thermal conductivity, heat capacity, density, and thermal expansion coefficient; 6) Initial conditions: Set the temperature, pressure, and other states of each point in the system at the beginning of the simulation; 7) Geometric boundary conditions: Specify the geometric boundaries within the simulation area, such as the size and shape of the cable joint; 8) Constraints: Such as fixed boundaries, symmetric boundaries, free boundaries, etc. These constraints are used to simulate the constraints of the joint under actual working conditions; 9) Heat source model: To simulate the heat source generated by the arc in the simulation, it is necessary to set the position, size, and action time of the heat source; 10) Fluid dynamics boundary conditions: If fluid flow is involved, it is necessary to set the inlet velocity and outlet pressure of the fluid.

[0052] According to the above embodiment of the present invention, in the above step S204, the cable joint is fault simulated using a simulation model to analyze the current maximum stress of the copper shell in the cable joint to obtain an analysis result, including: performing fault simulation on the cable joint using a simulation model to obtain a simulation result; and analyzing the stress currently borne by the copper shell using finite element software according to the simulation result to determine the current maximum stress currently borne by the copper shell.

[0053] In this embodiment, the simulation model can be used to simulate the short circuit fault of the cable joint filled with magnesium oxide, Kevlar fiber and air. Since the copper shell may cause explosion and fire after rupture, the maximum stress that the copper shell can withstand under the initial thickness combination of magnesium oxide, Kevlar fiber and air can be analyzed in the simulation process. According to the current maximum stress currently borne by the copper shell obtained by simulation, the thickness combination of magnesium oxide, Kevlar fiber and air is continuously adjusted to obtain the optimal thickness combination (i.e. Figure 4 Test groups that comply with the safety margin shown).

[0054] It should be noted that in the process of continuous simulation, the value of the initial thickness combination is updated in real time. After each adjustment of the thickness of each filling material, the current thickness combination of each layer of filling material obtained after the adjustment will replace the original value of the initial thickness combination to ensure that the cable joints filled with the same thickness combination will not be simulated repeatedly to avoid duplication of work.

[0055] Combine the following Figure 5 and Figure 6 The above embodiments of the present invention are described in detail. Figure 5 is a flow chart of performing fault simulation on a cable connector according to an embodiment of the present invention; Figure 6 is a schematic diagram of performing fault simulation on a cable connector according to an embodiment of the present invention.

[0056] like Figure 5 As shown, when simulating a short-circuit fault on a cable joint, the arc energy can be equivalent to an ellipsoidal heat source to directly transfer heat to the silicone rubber preform. The silicone rubber preform heats up and pyrolyzes into high-temperature and high-pressure gas. The high-temperature gas transfers heat to magnesium oxide, which heats up and vaporizes and absorbs heat. The high-pressure gas impacts the Kevlar layer, causing the Kevlar fiber to stretch and deform, squeezing the air and generating stress on the copper shell.

[0057] like Figure 6 As shown, the above process can be simulated by finite element calculation software, and the maximum stress on the copper shell can be calculated by solid and fluid heat transfer, fluid mechanics, and solid mechanics. The specific process is as follows:

[0058] 1) Heat conduction equation: , , where k is the thermal conductivity, T is the temperature, is the material density; is the heat capacity at normal pressure, Q is the heat source energy, u represents the fluid velocity, It indicates the heat generation rate per unit volume, that is, the heat generated per unit volume due to chemical reaction, nuclear reaction, current flow or other processes. is the convection term of the velocity vector, representing the temperature change caused by the movement of the fluid;

[0059] 2) Fluid mechanics equations: , where is the fluid density, q represents the heat flow, is the fluid dynamic viscosity, F is the volume force, u is the fluid velocity, p represents the fluid pressure, and I is the unit vector;

[0060] 3) Solid mechanics equations: , where represents stress, d represents displacement, q represents heat flow, n represents unit external normal vector, subscript f represents fluid, subscript s represents solid, where Represents the unit external normal vector on one side of the fluid. At the interface where the fluid contacts the solid, this vector points to the outside of the fluid and is perpendicular to the contact surface. Represents the unit external normal vector on one side of the solid. At the interface between the fluid and the solid, this vector points to the outside of the solid and is perpendicular to the contact surface;

[0061] 4) Chemical reaction rate equation: , represents the reaction rate, g represents the acceleration due to gravity, represents the reaction enthalpy change.

[0062] Step S206, a second acquisition step, when the analysis result indicates that the current maximum stress has not reached the optimal stress, the thickness of each layer of filling material is adjusted to obtain the current thickness combination of each layer of filling material, wherein the optimal stress is the maximum stress value that the copper shell can withstand while satisfying the constraint conditions.

[0063] In this embodiment, if the maximum stress that the copper shell can withstand under the initial thickness combination of magnesium oxide, Kevlar fiber and air does not reach the optimal stress, the thickness of each layer of filling material can be adjusted accordingly.

[0064] It should be noted that the optimal stress here is not a value set in advance, but is obtained in the process of continuous experiments. Assuming that the maximum stress that the copper shell can withstand after a large number of experiments tends to a certain value, or tends to a very small stress value range, it can be approximately considered that the maximum stress value is the optimal stress. According to the above embodiment of the present invention, in the above step S206, when the analysis result indicates that the current maximum stress has not reached the optimal stress, the thickness of each layer of filling material is adjusted, including: when the analysis result indicates that the current maximum stress is greater than the optimal stress, the Kevlar fiber layer in the filling material is increased by a first preset thickness, wherein the Kevlar fiber layer is a layer of filling material in the filling material; when the analysis result indicates that the current maximum stress is less than the optimal stress, the Kevlar fiber layer is reduced by a second preset thickness, wherein the first preset thickness and the second preset thickness are both determined by the first difference between the current maximum stress and the optimal stress.

[0065] Specifically, if the simulation results show that the stress on the copper shell is too high, it means that the thickness of the current Kevlar layer is not enough to effectively disperse or absorb the impact energy. The ideal stress level should be lower than the yield strength or breaking strength of the copper shell material to ensure that the copper shell will not break under extreme conditions. Therefore, the thickness of the Kevlar fiber layer can be increased to improve its impact resistance, disperse and absorb more impact force, thereby reducing the stress on the copper shell; accordingly, if the simulation results show that the stress borne is low and is not enough to achieve better fire and explosion resistance, the thickness of the Kevlar fiber layer can be appropriately reduced.

[0066] According to the above embodiment of the present invention, in the above step S206, the thickness of each layer of filling material is adjusted, including: obtaining a simulation result of a fault simulation of the cable joint; when the simulation result indicates that the fire resistance of the cable joint is lower than the fire resistance threshold, increasing the magnesium oxide layer in the filling material by a third preset thickness, wherein the third preset thickness is determined by the second difference between the fire resistance and the fire resistance threshold, and the magnesium oxide layer is a layer of filling material in the filling material; when the simulation result indicates that the buffering performance of the cable joint is lower than the buffering performance threshold, increasing the air layer in the filling material by a fourth preset thickness, wherein the fourth preset thickness is determined by the third difference between the buffering performance and the buffering performance.

[0067] Specifically, in the process of simulating the short-circuit fault of the cable joint, not only the stress on the copper shell, which is an important indicator for measuring the explosion-proof performance, is analyzed, but also the fire resistance of the magnesium oxide layer in the cable joint and the buffering performance of the air layer are analyzed; if the simulation results show that the fire resistance is insufficient, it may be because the thickness of the magnesium oxide layer is not enough to provide sufficient heat absorption and flame retardant effects. On the premise of ensuring the fire resistance of the cable joint, the magnesium oxide layer should be thick enough to absorb enough heat and reduce the free radicals in the pyrolysis products, thereby reducing the thermal stress of the copper shell. Therefore, increasing the thickness of the magnesium oxide layer can improve its flame retardant effect and heat absorption performance, which helps to quickly absorb heat when a fault occurs and reduce the thermal shock of the pyrolysis products on the copper shell; if the simulation results show that the buffering effect is insufficient, it may be because the thickness of the air layer is not enough to provide sufficient pressure buffering. The air layer should be thick enough to provide sufficient pressure buffering when an impact occurs, reducing the direct impact on the copper shell. Therefore, the thickness of the air layer can be appropriately increased to improve its buffering effect, which helps to reduce the impact of the shock wave on the copper shell, thereby reducing the stress on the copper shell.

[0068] It should be noted that when adjusting the thickness of each layer of filling material, it can be appropriately increased or decreased according to the simulation results. The specific numerical value of the increase or decrease can be determined in combination with the actual situation, and no specific restrictions or expansion are made here; in addition, when adjusting the thickness of each layer of filling material, the three layers of filling materials are adaptively adjusted in combination with the analysis of the current effects of the three layers of filling materials, rather than adjusting a single layer of filling material.

[0069] Step S208, an updating step, updates the initial thickness combination to the current thickness combination.

[0070] In this embodiment, after the thickness of each layer of filling material is adjusted, the value of the initial thickness combination can be replaced by the current thickness combination of the filling material obtained after the adjustment, so as to update the initial thickness combination.

[0071] Step S210, repeatedly executing the determination step, the first acquisition step, the second acquisition step and the update step until the current maximum stress reaches the optimal stress, and determining the initial thickness combination as the optimal thickness combination.

[0072] In this embodiment, after the initial thickness combination is updated each time, the simulation can be re-performed according to the above steps, and iterations are continuously performed until the optimal thickness combination is found.

[0073] It should be noted that the current maximum stress borne by the copper shell reaches the optimal stress as the condition for the termination of the iteration here because the stress that the copper shell can withstand is an important indicator for measuring the explosion-proof performance, and the fire resistance provided by the magnesium oxide layer and the buffering effect provided by the air layer are also to make the stress borne by the copper shell reach the optimal stress as much as possible while meeting the safety margin. Therefore, this condition is selected as the condition for the termination of the iteration; of course, other more suitable conditions can also be selected as the conditions for the termination of the iteration in combination with actual conditions, and no specific restrictions are made here.

[0074] Step S212, filling the filling materials into the cable joint according to the optimal thickness combination.

[0075] In this embodiment, filling materials such as magnesium oxide, Kevlar fiber and air can be filled into the cable joint according to the optimal thickness combination obtained in the above steps to improve the fire and explosion resistance of the cable joint.

[0076] As can be seen from the above, through the technical solution provided by the above embodiment of the present invention, the initial thickness combination of each layer of filling material in the cable joint can be determined through a determination step, wherein the cable joint is used to connect the cable and / or connect the cable with the electrical equipment, the filling material includes magnesium oxide, Kevlar fiber and air filled between the preform and the copper shell of the cable joint, the preform is used to seal the cable joint, the copper shell is the metal shell of the cable joint, and the initial thickness combination is a combination of the initial thickness of the magnesium oxide layer, the Kevlar fiber layer and the air layer; the first acquisition step, using the simulation model to perform fault simulation on the cable joint to analyze the current maximum stress of the copper shell in the cable joint to obtain an analysis result, wherein the current maximum stress is the maximum value of the stress borne by the copper shell when the thickness combination of each layer of filling material is the initial thickness combination; the second acquisition step, when the analysis result indicates that the current maximum stress has not reached the optimal stress Under the condition, the thickness of each layer of filling material is adjusted to obtain the current thickness combination of each layer of filling material, wherein the optimal stress is the maximum stress value that the copper shell can withstand under the condition of satisfying the constraint conditions; an updating step is performed to update the initial thickness combination to the current thickness combination; the determining step, the first obtaining step, the second obtaining step and the updating step are repeatedly performed until the current maximum stress reaches the optimal stress, and the initial thickness combination is determined to be the optimal thickness combination; each filling material is filled into the cable joint according to the optimal thickness combination, so as to achieve the purpose of continuously testing the optimal thickness combination of each layer of filling material through simulation, and filling each filling material into the cable joint according to the optimal thickness combination, and realize the technical effect of avoiding fire caused by flash explosion of the cable joint by filling the cable joint with fire-resistant and explosion-proof filling materials, thereby improving the safety, convenience and ease of installation of the cable joint.

[0077] Therefore, the technical solution provided by the above-mentioned embodiment of the present invention solves the technical problems in the related art that the traditional method of using an external protective device to avoid fire caused by flash explosion of cable joints has complex installation and poor convenience.

[0078] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0079] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0080] According to an embodiment of the present invention, a cable joint filling device for implementing the above cable joint filling method is also provided. Figure 7 is a schematic diagram of a cable joint filling device according to an embodiment of the present invention, Figure 7 As shown, the device includes: a first determination unit 701, a first acquisition unit 703, a second acquisition unit 705, an update unit 707, a second determination unit 709 and a filling unit 711. The cable joint filling device is described in detail below.

[0081] The first determination unit 701 is used to execute the determination step to determine the initial thickness combination of each layer of filling material in the cable joint, wherein the cable joint is used to connect the cable and / or connect the cable to the electrical equipment, the filling material includes magnesium oxide, Kevlar fiber and air filled between the preform and the copper shell of the cable joint, the preform is used to seal the cable joint, the copper shell is the metal shell of the cable joint, and the initial thickness combination is a combination of the initial thickness of the magnesium oxide layer, the Kevlar fiber layer and the air layer.

[0082] The first acquisition unit 703 is used to execute the first acquisition step, perform fault simulation on the cable joint by using the simulation model to analyze the current maximum stress of the copper shell in the cable joint, and obtain an analysis result, wherein the current maximum stress is the maximum value of the stress borne by the copper shell when the thickness combination of each layer of filling material is the initial thickness combination.

[0083] The second acquisition unit 705 is used to perform the second acquisition step. When the analysis result indicates that the current maximum stress does not reach the optimal stress, the thickness of each layer of filling material is adjusted to obtain the current thickness combination of each layer of filling material, wherein the optimal stress is the maximum stress value that the copper shell can withstand when the constraint conditions are met.

[0084] The updating unit 707 is used to execute the updating step to update the initial thickness combination to the current thickness combination.

[0085] The second determining unit 709 is used to repeatedly execute the determining step, the first obtaining step, the second obtaining step and the updating step until the current maximum stress reaches the optimal stress, and then determine that the initial thickness combination is the optimal thickness combination.

[0086] The filling unit 711 is used to fill the filling materials into the cable joint according to the optimal thickness combination.

[0087] It should be noted here that the above-mentioned first determination unit 701, first acquisition unit 703, second acquisition unit 705, update unit 707, second determination unit 709 and filling unit 711 correspond to steps S202 to S212 in the above-mentioned embodiments, and the six units are the same as the instances and application scenarios implemented by the corresponding steps, but are not limited to the contents disclosed in the above-mentioned embodiments.

[0088] As can be seen from the above, in the scheme recorded in the above-mentioned embodiment of the present invention, a first determination unit can be used to perform a determination step to determine the initial thickness combination of each layer of filling material in the cable joint, wherein the cable joint is used to connect the cable and / or connect the cable to the electrical equipment, and the filling material includes magnesium oxide, Kevlar fiber and air filled between the preform and the copper shell of the cable joint, the preform is used to seal the cable joint, the copper shell is the metal shell of the cable joint, and the initial thickness combination is a combination of the initial thickness of the magnesium oxide layer, the Kevlar fiber layer and the air layer; then the first acquisition unit is used to perform a first acquisition step, and the cable joint is simulated by a simulation model to analyze the current maximum stress of the copper shell in the cable joint to obtain an analysis result, wherein the current maximum stress is the maximum value of the stress borne by the copper shell when the thickness combination of each layer of filling material is the initial thickness combination; then the second acquisition unit is used to perform a second acquisition step, and when the analysis result indicates that the current maximum stress has not reached the optimal stress Under the condition, the thickness of each layer of filling material is adjusted to obtain the current thickness combination of each layer of filling material, wherein the optimal stress is the maximum stress value that the copper shell bears when the constraint conditions are met; then the updating unit is used to perform the updating step to update the initial thickness combination to the current thickness combination; the second determining unit is used to repeatedly perform the determining step, the first obtaining step, the second obtaining step and the updating step until the current maximum stress reaches the optimal stress, and the initial thickness combination is determined to be the optimal thickness combination; finally, the filling unit is used to fill each filling material into the cable joint according to the optimal thickness combination, so as to achieve the purpose of continuously testing the optimal thickness combination of each layer of filling material through simulation, and filling each filling material into the cable joint according to the optimal thickness combination, and realize the technical effect of avoiding fire caused by flash explosion of the cable joint by selecting fire-resistant and explosion-proof filling materials to fill the cable joint, thereby improving the safety, convenience and ease of installation of the cable joint.

[0089] Therefore, the technical solution provided by the above-mentioned embodiment of the present invention solves the technical problems in the related art that the traditional method of using an external protective device to avoid fire caused by flash explosion of cable joints has complex installation and poor convenience.

[0090] Optionally, the first determination unit includes: a first acquisition module, used to obtain the filling thickness between the preform and the copper shell in the cable joint; a first determination module, used to determine that the first predetermined thickness is the first initial thickness of the magnesium oxide layer, wherein the magnesium oxide layer is the first filling layer filled with magnesium oxide; a second determination module, used to determine that the second predetermined thickness is the second initial thickness of the Kevlar fiber layer, wherein the Kevlar fiber layer is the second filling layer filled with Kevlar fiber; a third determination module, used to determine that the third predetermined thickness is the third initial thickness of the air layer, wherein the sum of the first predetermined thickness, the second predetermined thickness and the third predetermined thickness is the same as the filling thickness, the magnesium oxide layer is located above the preform, the Kevlar fiber layer is located above the magnesium oxide layer, and the air layer is located above the Kevlar fiber layer and below the copper shell; a fourth determination module, used to determine that the combination of the first initial thickness, the second initial thickness and the third initial thickness is the initial thickness combination.

[0091] Optionally, the cable joint filling device also includes: a third acquisition unit, used to obtain the physical structure and material properties of the cable joint before performing fault simulation on the cable joint using a simulation model to analyze the current maximum stress of the copper shell in the cable joint and obtain the analysis result; a construction unit, used to input the physical structure and material properties into finite element software to construct a simulation model using finite element software; a third determination unit, used to determine the boundary conditions for fault simulation of the cable joint according to the safety standards that the cable joint needs to meet and the explosion-proof performance that needs to be achieved, wherein the boundary conditions are used to constrain the simulation process.

[0092] Optionally, the first acquisition unit includes: a second acquisition module, used to use a simulation model to perform fault simulation on the cable joint to obtain simulation results; a fifth determination module, used to use finite element software to analyze the stress currently borne by the copper shell according to the simulation results to determine the current maximum stress currently borne by the copper shell.

[0093] Optionally, the second acquisition unit includes: a first adjustment module, used to increase the Kevlar fiber layer in the filling material by a first preset thickness when the analysis result indicates that the current maximum stress is greater than the optimal stress, wherein the Kevlar fiber layer is a layer of filling material in the filling material; a second adjustment module, used to reduce the Kevlar fiber layer by a second preset thickness when the analysis result indicates that the current maximum stress is less than the optimal stress, wherein the first preset thickness and the second preset thickness are both determined by a first difference between the current maximum stress and the optimal stress.

[0094] Optionally, the second acquisition unit includes: a third acquisition module, used to obtain a simulation result of a fault simulation of a cable joint; a third adjustment module, used to increase the magnesium oxide layer in the filling material by a third preset thickness when the simulation result indicates that the fire resistance of the cable joint is lower than the fire resistance threshold, wherein the third preset thickness is determined by a second difference between the fire resistance and the fire resistance threshold, and the magnesium oxide layer is a layer of filling material in the filling material; a fourth adjustment module, used to increase the air layer in the filling material by a fourth preset thickness when the simulation result indicates that the buffering performance of the cable joint is lower than the buffering performance threshold, wherein the fourth preset thickness is determined by a third difference between the buffering performance and the buffering performance.

[0095] According to another aspect of an embodiment of the present invention, a cable joint is further provided. The cable joint uses any one of the above cable joint filling methods.

[0096] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, the computer-readable storage medium comprising a stored program, wherein the program executes any one of the above-mentioned cable joint filling methods.

[0097] Optionally, in this embodiment, the computer-readable storage medium may be located in any one of the computer terminals in a computer terminal group in a computer network, or in any one of the communication devices in a communication device group.

[0098] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: a determination step of determining an initial thickness combination of each layer of filling material in a cable joint, wherein the cable joint is used to connect a cable and / or connect a cable to an electrical device, the filling material comprises magnesium oxide, Kevlar fiber and air filled between a preform and a copper shell of the cable joint, the preform is used to seal the cable joint, the copper shell is a metal shell of the cable joint, and the initial thickness combination is a combination of the initial thicknesses of the magnesium oxide layer, the Kevlar fiber layer and the air layer; a first acquisition step of performing a fault simulation on the cable joint using a simulation model to analyze the current maximum stress of the copper shell in the cable joint to obtain an analysis result, wherein, The current maximum stress is the maximum value of the stress borne by the copper shell when the thickness combination of each layer of filling material is the initial thickness combination; the second acquisition step, when the analysis result indicates that the current maximum stress has not reached the optimal stress, the thickness of each layer of filling material is adjusted to obtain the current thickness combination of each layer of filling material, wherein the optimal stress is the maximum stress value borne by the copper shell when the constraint conditions are met; the updating step, updating the initial thickness combination to the current thickness combination; repeating the determination step, the first acquisition step, the second acquisition step and the updating step until the current maximum stress reaches the optimal stress, determining the initial thickness combination as the optimal thickness combination; filling each filling material into the cable joint according to the optimal thickness combination.

[0099] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for performing the following steps: obtaining the filling thickness between the preform and the copper shell in the cable connector; determining the first predetermined thickness as the first initial thickness of the magnesium oxide layer, wherein the magnesium oxide layer is the first filling layer filled with magnesium oxide; determining the second predetermined thickness as the second initial thickness of the Kevlar fiber layer, wherein the Kevlar fiber layer is the second filling layer filled with Kevlar fiber; determining the third predetermined thickness as the third initial thickness of the air layer, wherein the sum of the first predetermined thickness, the second predetermined thickness and the third predetermined thickness is the same as the filling thickness, the magnesium oxide layer is located above the preform, the Kevlar fiber layer is located above the magnesium oxide layer, and the air layer is located above the Kevlar fiber layer and below the copper shell; determining the combination of the first initial thickness, the second initial thickness and the third initial thickness as the initial thickness combination.

[0100] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: obtaining the physical structure and material properties of the cable connector; inputting the physical structure and material properties into finite element software to construct a simulation model using the finite element software; determining the boundary conditions for fault simulation of the cable connector based on the safety standards that the cable connector needs to meet and the explosion-proof performance that needs to be achieved, wherein the boundary conditions are used to constrain the simulation process.

[0101] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: performing fault simulation on the cable joint using a simulation model to obtain simulation results; and analyzing the stress currently borne by the copper shell using finite element software according to the simulation results to determine the current maximum stress currently borne by the copper shell.

[0102] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for executing the following steps: when the analysis result indicates that the current maximum stress is greater than the optimal stress, the Kevlar fiber layer in the filling material is increased by a first preset thickness, wherein the Kevlar fiber layer is a layer of filling material in the filling material; when the analysis result indicates that the current maximum stress is less than the optimal stress, the Kevlar fiber layer is reduced by a second preset thickness, wherein the first preset thickness and the second preset thickness are both determined by a first difference between the current maximum stress and the optimal stress.

[0103] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: obtaining simulation results of fault simulation of the cable joint; when the simulation results indicate that the fire resistance of the cable joint is lower than the fire resistance threshold, increasing the magnesium oxide layer in the filling material by a third preset thickness, wherein the third preset thickness is determined by a second difference between the fire resistance and the fire resistance threshold, and the magnesium oxide layer is a layer of filling material in the filling material; when the simulation results indicate that the buffering performance of the cable joint is lower than the buffering performance threshold, increasing the air layer in the filling material by a fourth preset thickness, wherein the fourth preset thickness is determined by the third difference between the buffering performance and the buffering performance.

[0104] According to another aspect of an embodiment of the present invention, a processor is further provided, and the processor is used to run a program, wherein any one of the above-mentioned cable joint filling methods is executed when the program is run.

[0105] According to another aspect of an embodiment of the present invention, a computer program product is further provided, comprising computer instructions, and when the computer instructions are executed by a processor, any one of the above-mentioned cable joint filling methods is executed.

[0106] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0107] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0108] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0109] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0110] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0111] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.

[0112] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cable joint filling method, characterized in that: include: A determination step, determining an initial thickness combination of each layer of filling material in a cable joint, wherein the cable joint is used to connect a cable and / or connect the cable to an electrical device, the filling material comprises magnesium oxide, Kevlar fiber and air filled between a preform and a copper shell of the cable joint, the preform is used to seal the cable joint, the copper shell is a metal shell of the cable joint, and the initial thickness combination is a combination of the initial thicknesses of a magnesium oxide layer, a Kevlar fiber layer and an air layer; Wherein, determining the initial thickness combination of each layer of filling material in the cable joint includes: obtaining the filling thickness between the preform and the copper shell in the cable joint; determining the first predetermined thickness as the first initial thickness of the magnesium oxide layer, the magnesium oxide layer is the first filling layer filled with the magnesium oxide; determining the second predetermined thickness as the second initial thickness of the Kevlar fiber layer, the Kevlar fiber layer is the second filling layer filled with the Kevlar fiber; determining the third predetermined thickness as the third initial thickness of the air layer, the sum of the first predetermined thickness, the second predetermined thickness and the third predetermined thickness is the same as the filling thickness, the magnesium oxide layer is located above the preform, the Kevlar fiber layer is located above the magnesium oxide layer, the air layer is located above the Kevlar fiber layer and below the copper shell; determining the combination of the first initial thickness, the second initial thickness and the third initial thickness as the initial thickness combination; In a first acquisition step, a fault simulation is performed on the cable joint using a simulation model to analyze the current maximum stress of the copper shell in the cable joint to obtain an analysis result, wherein the current maximum stress is the maximum value of the stress borne by the copper shell when the thickness combination of the filling material in each layer is the initial thickness combination; A second acquisition step, when the analysis result indicates that the current maximum stress does not reach the optimal stress, adjusting the thickness of each layer of the filling material to obtain a current thickness combination of each layer of the filling material, wherein the optimal stress is the maximum stress value that the copper shell withstands when the constraint conditions are met; Wherein, when the analysis result indicates that the current maximum stress does not reach the optimal stress, the thickness of each layer of the filling material is adjusted, including: when the analysis result indicates that the current maximum stress is greater than the optimal stress, the Kevlar fiber layer in the filling material is increased by a first preset thickness, the Kevlar fiber layer being a layer of the filling material in the filling material; when the analysis result indicates that the current maximum stress is less than the optimal stress, the Kevlar fiber layer is reduced by a second preset thickness, the first preset thickness and the second preset thickness being both determined by a first difference between the current maximum stress and the optimal stress; Wherein, the thickness of each layer of the filling material is adjusted, including: obtaining a simulation result of a fault simulation of the cable joint; when the simulation result indicates that the fire resistance of the cable joint is lower than the fire resistance threshold, increasing the magnesium oxide layer in the filling material by a third preset thickness, the third preset thickness is determined by the second difference between the fire resistance and the fire resistance threshold, and the magnesium oxide layer is a layer of the filling material in the filling material; when the simulation result indicates that the buffering performance of the cable joint is lower than the buffering performance threshold, increasing the air layer in the filling material by a fourth preset thickness, the fourth preset thickness is determined by the third difference between the buffering performance and the buffering performance An updating step of updating the initial thickness combination to the current thickness combination; Repeating the determining step, the first obtaining step, the second obtaining step and the updating step until the current maximum stress reaches the optimal stress, determining the initial thickness combination as the optimal thickness combination; The filling materials are filled into the cable joint according to the optimal thickness combination.

2. The cable joint filling method according to claim 1, characterized in that: Before performing fault simulation on the cable joint by using the simulation model to analyze the current maximum stress of the copper shell in the cable joint and obtaining the analysis result, the method further includes: Obtaining the physical structure and material properties of the cable connector; Inputting the physical structure and the material properties into finite element software to construct the simulation model using the finite element software; Boundary conditions for performing fault simulation on the cable joint are determined according to the safety standards that the cable joint needs to meet and the explosion-proof performance that needs to be achieved, wherein the boundary conditions are used to constrain the simulation process.

3. The cable joint filling method according to claim 1, characterized in that: The cable joint is subjected to fault simulation using a simulation model to analyze the current maximum stress of the copper shell in the cable joint, and analysis results are obtained, including: Performing fault simulation on the cable joint using the simulation model to obtain a simulation result; According to the simulation result, the stress currently borne by the copper shell is analyzed by using finite element software to determine the current maximum stress currently borne by the copper shell.

4. A cable joint filling device, characterized in that: include: A first determining unit is used to perform a determining step to determine an initial thickness combination of each layer of filling material in a cable joint, wherein the cable joint is used to connect a cable and / or connect the cable to an electrical device, the filling material comprises magnesium oxide, Kevlar fiber and air filled between a preform and a copper shell of the cable joint, the preform is used to seal the cable joint, the copper shell is a metal shell of the cable joint, and the initial thickness combination is a combination of the initial thicknesses of the magnesium oxide layer, the Kevlar fiber layer and the air layer; Wherein, the first determination unit includes: a first acquisition module, used to obtain the filling thickness between the preform and the copper shell in the cable joint; a first determination module, used to determine that the first predetermined thickness is the first initial thickness of the magnesium oxide layer, and the magnesium oxide layer is the first filling layer filled with the magnesium oxide; a second determination module, used to determine that the second predetermined thickness is the second initial thickness of the Kevlar fiber layer, and the Kevlar fiber layer is the second filling layer filled with the Kevlar fiber; a third determination module, used to determine that the third predetermined thickness is the third initial thickness of the air layer, the sum of the first predetermined thickness, the second predetermined thickness and the third predetermined thickness is the same as the filling thickness, the magnesium oxide layer is located above the preform, the Kevlar fiber layer is located above the magnesium oxide layer, and the air layer is located above the Kevlar fiber layer and below the copper shell; a fourth determination module, used to determine that the combination of the first initial thickness, the second initial thickness and the third initial thickness is the initial thickness combination; A first acquisition unit, configured to execute a first acquisition step, perform a fault simulation on the cable joint using a simulation model, so as to analyze a current maximum stress of the copper shell in the cable joint, and obtain an analysis result, wherein the current maximum stress is a maximum value of the stress borne by the copper shell when the thickness combination of the filling material in each layer is the initial thickness combination; A second acquisition unit is used to perform a second acquisition step, and when the analysis result indicates that the current maximum stress does not reach the optimal stress, the thickness of each layer of the filling material is adjusted to obtain a current thickness combination of each layer of the filling material, wherein the optimal stress is the maximum stress value that the copper shell is subjected to when the constraint condition is satisfied; The second acquisition unit includes: a first adjustment module, which is used to increase the Kevlar fiber layer in the filling material by a first preset thickness when the analysis result indicates that the current maximum stress is greater than the optimal stress, and the Kevlar fiber layer is a layer of the filling material in the filling material; a second adjustment module, which is used to reduce the Kevlar fiber layer by a second preset thickness when the analysis result indicates that the current maximum stress is less than the optimal stress, and the first preset thickness and the second preset thickness are both determined by a first difference between the current maximum stress and the optimal stress; The second acquisition unit further includes: a third acquisition module, which is used to acquire a simulation result of a fault simulation of the cable joint; a third adjustment module, which is used to increase the magnesium oxide layer in the filling material by a third preset thickness when the simulation result indicates that the fire resistance performance of the cable joint is lower than the fire resistance performance threshold, and the third preset thickness is determined by the second difference between the fire resistance performance and the fire resistance performance threshold, and the magnesium oxide layer is a layer of the filling material in the filling material; a fourth adjustment module, which is used to increase the air layer in the filling material by a fourth preset thickness when the simulation result indicates that the buffering performance of the cable joint is lower than the buffering performance threshold, and the fourth preset thickness is determined by the third difference between the buffering performance and the buffering performance; An updating unit, configured to execute an updating step to update the initial thickness combination to the current thickness combination; a second determining unit, configured to repeatedly perform the determining step, the first acquiring step, the second acquiring step, and the updating step until the current maximum stress reaches the optimal stress, and then determine that the initial thickness combination is the optimal thickness combination; A filling unit is used to fill each of the filling materials into the cable joint according to the optimal thickness combination.

5. A cable connector, characterized in that: The cable joint uses the cable joint filling method according to any one of claims 1 to 3 above.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the cable joint filling method according to any one of claims 1 to 3.

7. A computer program product comprising computer instructions, characterized in that When the computer instructions are executed by a processor, the cable joint filling method according to any one of claims 1 to 3 is performed.

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