Configuration method and device of water pipe insulation joint, medium and terminal equipment

Abstract

The invention discloses a configuration method and device of a water pipe insulation joint, a medium and terminal equipment. The method comprises the following steps: calculating axial resistance between adjacent insulating joints; constructing an equivalent T-shaped circuit based on the resistor and a human body contact water pipe circuit; calculating an initial contact current through the circuit; verifying the initial current by using a ground screen model to obtain a final contact current value; optimizing the configuration of the insulated joints according to the final current value, and determining the number and positions of the insulated joints; and finally, installing an insulating joint at a corresponding position on the water pipe. According to the method, the safety of water pipe electric shock in an electric power system is improved, meanwhile, cost and construction efficiency are optimized, and the problem that in the prior art, it is difficult to configure water pipe insulation joints at proper positions and in proper number is solved.

Description

Technical Field

[0001] The present invention relates to the field of configuration of water pipe insulating joints, and in particular to a configuration method, device, medium and terminal equipment of water pipe insulating joints. Background Art

[0002] In the power system, metal water pipes may become the medium for conducting the potential difference between the inside and outside of the power station due to their conductive properties. When a metal water pipe has both a high potential lead outside and a low potential lead inside, it means that the outside of the water pipe may have a high potential due to contact with the high-voltage part of the power station, while the inside may have a low potential due to connection to the low-voltage system or grounding. In this case, the water pipe may become a conduction path for the potential difference, increasing the risk of electric shock.

[0003] For buried metal water pipes, in order to isolate this potential difference, it is necessary to insert sufficiently long insulation sections at appropriate locations of the water pipes. These insulation sections can effectively prevent the flow of current through the water pipes, thereby reducing the risk of electric shock. However, it is not enough to simply insert insulation sections where the overhead water pipes leave the power station, because this cannot fully control the potential distribution along the length of the water pipe, especially in the area around the power station, where there may be complex underground facilities such as cables, pipelines and other structures, which may affect the distribution of potential.

[0004] To manage this risk more effectively, additional measures may need to be taken, such as insulation between the pipe and the support to prevent current from passing through the support to the ground or elsewhere. In addition, voltage-equalizing grounding electrodes can be laid along the water pipes. These grounding electrodes can help to disperse and manage the potential along the water pipes, reduce potential differences, and provide a safe current return path to the ground.

[0005] However, due to the dense underground facilities in the area around the power station, laying grounding electrodes over a large area may encounter many practical difficulties. These difficulties include but are not limited to: the need to coordinate the layout of multiple underground facilities, deal with the mutual interference between different facilities, and find suitable space in the existing infrastructure to install new grounding electrodes. These problems make it difficult to configure the appropriate location and number of water pipe insulation joints. Summary of the invention

[0006] The present invention provides a method, device, medium and terminal equipment for configuring a water pipe insulating joint, so as to solve the problem in the prior art that it is difficult to configure the water pipe insulating joints in a suitable position and quantity.

[0007] In a first aspect, the present application provides a method for configuring a water pipe insulating joint, comprising:

[0008] Obtaining the axial resistance between two adjacent insulating joints;

[0009] An equivalent T-shaped circuit is constructed according to the axial resistance and the first circuit; wherein the first circuit is a circuit when a human body is in contact with a water pipe;

[0010] According to the equivalent T-type circuit, an initial contact current value is calculated;

[0011] Check the initial contact current value according to the Diwang model to obtain a final contact current value;

[0012] Solving the objective function according to the final contact current value to obtain the number and installation positions of the insulating joints at the maximum value of the final contact current;

[0013] According to the number and installation positions of the insulating joints, the number of insulating joints are arranged at the installation positions of the metal water pipes.

[0014] This application obtains the axial resistance between two adjacent insulating joints to provide basic data for subsequent circuit simulation and ensure the accuracy of the circuit model. This application constructs an equivalent T-shaped circuit to simulate the circuit state when the human body contacts the water pipe, so that the contact current can be predicted more realistically. The initial contact current value is checked by the ground grid model, and the accuracy of the contact current is further corrected and verified, ensuring the consistency of the simulation results with the actual situation. On this basis, the final contact current value is used to solve the objective function, optimize the number and installation position of the insulating joints, and thus minimize the maximum contact current while ensuring safety. This solves the problem of difficulty in configuring the appropriate position and number of water pipe insulating joints in the prior art.

[0015] As a preferred embodiment of the first aspect, the obtaining of the axial resistance between two adjacent insulating joints is specifically as follows:

[0016] Construct an equivalent circuit containing an insulating joint based on the transmission line model;

[0017] Obtaining the axial resistance of the water body per unit length in the water pipe, the radial conductance of the insulating layer per unit length in the water pipe, and the radial conductance of the water body per unit length in the water pipe in the equivalent circuit;

[0018] The axial resistance between two adjacent insulating joints is calculated and obtained according to the axial resistance, the radial conductance of the insulating layer per unit length of the water pipe, and the radial conductance of the water body per unit length of the water pipe.

[0019] In this preferred embodiment, the present application constructs an equivalent circuit containing an insulating joint through a transmission line model, and the present application ensures that the circuit model can truly reflect the electrical characteristics of the water pipe. The present application can consider in detail the influence of different materials and structures in the water pipe on the flow of current by obtaining the axial resistance of the water body per unit length in the water pipe, the radial conductance of the insulating layer per unit length in the water pipe, and the radial conductance of the water body per unit length in the water pipe in the equivalent circuit. Finally, by calculating the axial resistance between two adjacent insulating joints by combining these parameters, the present application can more accurately predict the distribution and flow of current in the water pipe. This precise resistance calculation makes the equivalent T-shaped circuit and ground grid model constructed in the subsequent steps closer to the actual working conditions, so that the installation position and number of the insulating joints finally determined can more effectively control the contact current and reduce the risk of electric shock. In addition, the high precision of this method also helps to reduce over-design and avoid unnecessary use of insulating joints, thereby saving costs and improving construction efficiency. Therefore, the present application not only improves the safety of the metal water pipe system, but also optimizes the economy and construction convenience.

[0020] As a preferred embodiment of the first aspect, the initial contact current value is checked according to the Diwang model to obtain the final contact current value, specifically:

[0021] Obtain the node potential of the pipe section where the human body contacts according to the ground grid model;

[0022] Calculating a simulated contact current based on the node potential;

[0023] If the error between the initial contact current value and the simulated contact current value is less than or equal to a preset threshold, the initial contact current value is the final contact current value.

[0024] The simulated contact current is calculated according to the node potential, specifically:

[0025] Obtain the node potential of the pipe section where the human body contacts;

[0026] According to the node potential, the simulated contact current is calculated; wherein the calculation formula of the simulated contact current is:

[0027]

[0028] Among them, i is the number of the pipe section that the human body contacts, u i is the node potential of the pipe section where the human body contacts, I ji is the contact current flowing through the human body, R H is the human body resistance, R F is the grounding resistance of human feet, R 2i is the first equivalent resistance value, R di is the second equivalent resistance value, U di is the voltage value of the first contact current circuit, UdH is the voltage value of the second contact current loop.

[0029] In this preferred embodiment, the present application obtains the node potential of the human body contact pipe section through the ground grid model. This step simulates the distribution of current in the ground and water pipe system in the actual environment, thereby providing a more realistic current distribution picture. Next, these node potential data are used to calculate the simulated contact current. This step is to convert the theoretical data into a predictable current value through a mathematical model, so that the calculation result is closer to the actual situation in actual operation. Finally, by comparing the initial contact current value with the simulated contact current value, if the error between the two is less than or equal to the preset threshold, the accuracy of the initial contact current value can be confirmed, and then it can be determined as the final contact current value. This process not only improves the accuracy of the current value prediction, but also increases the safety of the entire system. Through this method, the present application can ensure that in actual applications, the insulating joint configuration of the water pipe system can meet safety requirements, effectively reduce the risk of electric shock, and also improve the efficiency and economy of engineering design.

[0030] In a second aspect, the present application provides a configuration device for a water pipe insulating joint. The configuration device for a water pipe insulating joint includes an acquisition module, a calculation module, a verification module, a solution module, and a configuration module;

[0031] The acquisition module is used to acquire the axial resistance between two adjacent insulating joints;

[0032] The calculation module is used to construct an equivalent T-shaped circuit according to the axial resistance and the first circuit; wherein the first circuit is a circuit when a human body contacts a water pipe; and the initial contact current value is calculated according to the equivalent T-shaped circuit;

[0033] The checking module is used to check the initial contact current value according to the Diwang model to obtain the final contact current value;

[0034] The solution module is used to solve the objective function according to the final contact current value to obtain the number and installation positions of the insulating joints when the final contact current is at the maximum value;

[0035] The configuration module is used to configure the number of insulating joints at the installation position of the metal water pipe according to the number and installation position of the insulating joints.

[0036] This device uses five modules to divide the work and coordinate work to better configure the appropriate position and number of water pipe insulating joints. This application provides basic data for subsequent circuit simulation by obtaining the axial resistance between two adjacent insulating joints, thereby ensuring the accuracy of the circuit model. This application constructs an equivalent T-shaped circuit to simulate the circuit state when the human body contacts the water pipe, so that the contact current can be predicted more realistically. The initial contact current value is checked by the ground grid model, and the accuracy of the contact current is further corrected and verified, ensuring the consistency of the simulation results with the actual situation. On this basis, the final contact current value is used to solve the objective function, optimize the number and installation position of the insulating joints, and thereby minimize the maximum contact current while ensuring safety. This solves the problem that it is difficult to configure the appropriate position and number of water pipe insulating joints in the prior art.

[0037] As a preferred embodiment of the second aspect, the obtaining of the axial resistance between two adjacent insulating joints is specifically as follows:

[0038] Construct an equivalent circuit containing an insulating joint based on the transmission line model;

[0039] Obtaining the axial resistance of the water body per unit length in the water pipe, the radial conductance of the insulating layer per unit length in the water pipe, and the radial conductance of the water body per unit length in the water pipe in the equivalent circuit;

[0040] The axial resistance between two adjacent insulating joints is calculated and obtained according to the axial resistance, the radial conductance of the insulating layer per unit length of the water pipe, and the radial conductance of the water body per unit length of the water pipe.

[0041] In this preferred embodiment, the present application constructs an equivalent circuit containing an insulating joint through a transmission line model, and the present application ensures that the circuit model can truly reflect the electrical characteristics of the water pipe. The present application can consider in detail the influence of different materials and structures in the water pipe on the flow of current by obtaining the axial resistance of the water body per unit length in the water pipe, the radial conductance of the insulating layer per unit length in the water pipe, and the radial conductance of the water body per unit length in the water pipe in the equivalent circuit. Finally, by calculating the axial resistance between two adjacent insulating joints by combining these parameters, the present application can more accurately predict the distribution and flow of current in the water pipe. This precise resistance calculation makes the equivalent T-shaped circuit and ground grid model constructed in the subsequent steps closer to the actual working conditions, so that the installation position and number of the insulating joints finally determined can more effectively control the contact current and reduce the risk of electric shock. In addition, the high precision of this method also helps to reduce over-design and avoid unnecessary use of insulating joints, thereby saving costs and improving construction efficiency. Therefore, the present application not only improves the safety of the metal water pipe system, but also optimizes the economy and construction convenience.

[0042] As a preferred embodiment of the second aspect, the initial contact current value is checked according to the Diwang model to obtain the final contact current value, specifically:

[0043] Obtain the node potential of the pipe section where the human body contacts according to the ground grid model;

[0044] Calculating a simulated contact current based on the node potential;

[0045] If the error between the initial contact current value and the simulated contact current value is less than or equal to a preset threshold, the initial contact current value is the final contact current value.

[0046] The simulated contact current is calculated according to the node potential, specifically:

[0047] Obtain the node potential of the pipe section where the human body contacts;

[0048] According to the node potential, the simulated contact current is calculated; wherein the calculation formula of the simulated contact current is:

[0049]

[0050] Among them, i is the number of the pipe section that the human body contacts, u i is the node potential of the pipe section where the human body contacts, I ji is the contact current flowing through the human body, R H is the human body resistance, R F is the grounding resistance of human feet, R 2i is the first equivalent resistance value, R di is the second equivalent resistance value, U di is the voltage value of the first contact current circuit, U dH is the voltage value of the second contact current loop.

[0051] In this preferred embodiment, the present application obtains the node potential of the human body contact pipe section through the ground grid model. This step simulates the distribution of current in the ground and water pipe system in the actual environment, thereby providing a more realistic current distribution picture. Next, these node potential data are used to calculate the simulated contact current. This step is to convert the theoretical data into a predictable current value through a mathematical model, so that the calculation result is closer to the actual situation in actual operation. Finally, by comparing the initial contact current value with the simulated contact current value, if the error between the two is less than or equal to the preset threshold, the accuracy of the initial contact current value can be confirmed, and then it can be determined as the final contact current value. This process not only improves the accuracy of the current value prediction, but also increases the safety of the entire system. Through this method, the present application can ensure that in actual applications, the insulating joint configuration of the water pipe system can meet safety requirements, effectively reduce the risk of electric shock, and also improve the efficiency and economy of engineering design. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 : A schematic diagram of a flow chart of an embodiment of a method for configuring a water pipe insulating joint provided in the present application;

[0053] Figure 2 : A schematic diagram of the structure of a metal water pipe with an inner insulation layer provided in this application;

[0054] Figure 3 : A schematic diagram of the structure of the equivalent circuit model provided in this application;

[0055] Figure 4 : A schematic diagram of the structure of the grounding pipe section and T-shaped equivalent circuit provided in this application;

[0056] Figure 5 : A schematic diagram of the structure of the contact current loop provided in this application;

[0057] Figure 6 : A schematic diagram of the structure of the axial resistor provided in this application;

[0058] Figure 7 : A schematic diagram of the structure of the resistor flowing through the inner insulating layer provided in the present application;

[0059] Figure 8 : A schematic diagram of the structure for selecting the length of the inner insulation layer provided in this application;

[0060] Fig. 9 : A schematic diagram of the structure of the insulating joint configuration of the ground-insulated water pipe provided in the present application;

[0061] Fig.10 : A schematic diagram of the structure of the segmented insulation measures for preventing and controlling the transfer potential provided in this application;

[0062] Fig.11 : A schematic diagram of the structure of the potential distribution provided in this application;

[0063] Fig.12 : A schematic diagram of the structure of the contact current provided in this application;

[0064] Fig.13 : A schematic diagram of the structure of the step voltage provided in this application;

[0065] Fig.14 : A structural diagram for comparing the maximum contact current calculation results provided in this application;

[0066] Fig.15 : A structural schematic diagram of an embodiment of a configuration device for a water pipe insulating joint provided in the present application. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0068] Embodiment 1

[0069] Please refer to Figure 1 , which is a configuration method of a water pipe insulating joint provided by an embodiment of the present invention.

[0070] In this embodiment, the process of the method for configuring the water pipe insulating joint in this application is described in detail through steps S01-S06.

[0071] This embodiment adopts segmented insulation measures to increase the axial impedance of the water pipe, reduce the current flowing through the water pipe, and the possible contact current. Considering that the oil and gas industry has a mature pipeline insulation joint manufacturing process and the price of small-sized joints is low, in order to avoid using insulating pipes outside the station, the project uses insulating joints to segment the metal water pipe, and then uses the inner insulation layer to increase the axial impedance of the water pipe, such as Figure 2 As shown, L0 in the figure is the length of the pipe section between adjacent insulating joints.

[0072] S01: Obtain the axial resistance between two adjacent insulating joints.

[0073] As a preferred embodiment of the first embodiment, the axial resistance between two adjacent insulating joints is obtained by:

[0074] In order to analyze the effect of segmented insulation measures, a transmission line model is constructed Figure 3 In the equivalent circuit, R is the axial resistance of the water per unit length in the water pipe, G0=G+Gw, G is the radial conductance of the insulating layer per unit length of the water pipe, Gw is the radial conductance of the water per unit length of the water pipe, i is the current flowing through the water, u is the voltage acting on the inner insulating layer, and i and u satisfy equation 1.

[0075]

[0076] If the current is evenly distributed along the radial direction of the water pipe, the radial resistance is:

[0077]

[0078] The radial conductivity of water is much smaller than that of the insulating layer, so G in equation (1) w can be ignored, and formula (1) can be written as:

[0079]

[0080] If the pipe section between adjacent insulating joints is insulated from the ground, the current in the water at the insulating joints at both ends is equal, that is:

[0081] i(0)=i(L0) (4)

[0082] Combining equations (3) and (4), the axial resistance of the insulating pipe section between adjacent insulating joints to the ground is:

[0083]

[0084] If there is a grounding point or human contact in the pipe section between adjacent insulating joints, and all the current flows to the grounding point or human body, then:

[0085] i(L0)=0 (6)

[0086] Combining equations (3) and (6), the resistance of current flowing through the inner insulation layer is:

[0087]

[0088] The present application constructs an equivalent circuit containing an insulating joint through a transmission line model, and the present application ensures that the circuit model can truly reflect the electrical characteristics of the water pipe. The present application can consider in detail the influence of different materials and structures in the water pipe on the flow of current by obtaining the axial resistance of the water body per unit length in the water pipe, the radial conductance of the insulating layer per unit length in the water pipe, and the radial conductance of the water body per unit length in the water pipe in the equivalent circuit. Finally, by calculating the axial resistance between two adjacent insulating joints by combining these parameters, the present application can more accurately predict the distribution and flow of current in the water pipe. This precise resistance calculation makes the equivalent T-shaped circuit and ground grid model constructed in the subsequent steps closer to the actual working conditions, so that the installation position and number of the insulating joints finally determined can more effectively control the contact current and reduce the risk of electric shock. In addition, the high precision of this method also helps to reduce over-design and avoid unnecessary use of insulating joints, thereby saving costs and improving construction efficiency. Therefore, the present application not only improves the safety of the metal water pipe system, but also optimizes the economy and construction convenience.

[0089] S02: constructing an equivalent T-shaped circuit according to the axial resistance and the first circuit; wherein the first circuit is a circuit when a human body is in contact with a water pipe.

[0090] As a preferred embodiment of the first embodiment, an equivalent T-shaped circuit is constructed according to the axial resistance and the first circuit; wherein the first circuit is a circuit when a human body is in contact with a water pipe, specifically: considering the general situation that a water pipe has a grounding point or human contact, the pipe section between adjacent insulating joints is equivalent to a T-shaped circuit, such as Figure 4, R1 and R2 in the figure satisfy equation (8). For overhead water pipes laid in urban areas, the pipes and brackets are generally insulated at their contact points, and the ground current is small. Therefore, Ud in the figure is approximately the grounding point potential when there is no water pipe, and Rd is the grounding resistance.

[0091]

[0092] When the human body comes into contact with the water pipe, the equivalent circuit is as follows Figure 5 , the insulation segmentation measure can increase the axial impedance between different pipe sections and the radial impedance of the current flowing out of the water pipe, thereby reducing the contact current. Equations (5), (7) and (8) show that the effect of the segmented insulation measure is determined by the resistivity of the inner insulation layer and the length of the pipe section. If the thickness of the inner insulation layer is 3 mm, the axial and radial resistances of the pipe section under different inner insulation layer resistivities are as follows: Figure 6 . Figure 6 It shows that there is an obvious saturation trend in the axial and radial resistances, and only the inner insulation layer within a certain range close to the insulating joint is effective.

[0093] Adding insulating joints and internally insulated water pipes can increase the axial resistance of the water pipes, but it will increase the project cost. Therefore, it is necessary to reduce the number of insulating joints and the length of internally insulated water pipes while ensuring safety.

[0094] S03: According to the equivalent T-type circuit, an initial contact current value is calculated.

[0095] As a preferred embodiment of the first embodiment, the initial contact current value is calculated according to the equivalent T-type circuit, specifically:

[0096] When the water pipe is insulated from the ground, Figure 5 The contact current is obtained as:

[0097]

[0098] Formula (9) shows that the contact current increases with the distance between the grounding grid and the human foot, and decreases with the increase in the number of insulating joints. To configure the position of the insulating joint, this paper starts from the connection point between the water pipe and the grounding grid, checks the contact current in the process of moving away from the grounding grid, and uses an insulating joint at the corresponding position if the limit is reached.

[0099] Depend on Figure 7 It can be seen that the radial resistance is very large when the pipe section is short, while the saturation value of the axial resistance is limited. In order to make full use of the radial resistance, the axial resistance and the radial resistance are plotted on the same coordinates, and the pipe section length at the intersection is taken as the inner insulation layer length of each insulating joint, such as Figure 8 shown.

[0100] For overhead water pipes, if the resistivity of the inner insulation layer is 103Ω·m2, 104Ω·m2, and 105Ω·m2 respectively, the location of the insulating joint and the contact current at each point of the pipeline after configuration are as follows: Fig. 9 .

[0101] Fig.10 The figure shows the number of insulating joints required for the ground-insulated water pipe at each inner insulation layer resistance and the total length of the water pipe with inner insulation layer required. Fig. 9 The above is a configuration scheme for the segmented insulation measures with the shortest required length of the water pipe with inner insulation layer, and each insulating joint is installed at the farthest position from the power station under the condition of meeting safety requirements. If the insulating joint is to be installed near the power station, the distance between the connected insulating joints should be appropriately increased to avoid electric shock accidents.

[0102] If the water pipe is not insulated, it may be grounded through the bracket. Figure 5 And the node voltage method can be obtained:

[0103]

[0104] In formula (10), N is the number of pipe sections, which is 1 more than the number of insulating joints; i is the number of the pipe section in contact with the human body; xk, yk and Ua are as follows:

[0105] x k =1 / (R 1(k-1) +R 1k ) (11)

[0106]

[0107] After calculating the node potential ui of the pipe section where the human body contacts, the contact current flowing through the human body can be calculated:

[0108]

[0109] The construction of the equivalent T-shaped circuit of this application is based on a deep understanding of the electrical connection between the water pipe, the human body and the ground, so that the simulation results are closer to the actual situation. Secondly, the initial contact current value obtained by calculation can provide important basic data for the subsequent contact current optimization and insulation joint layout. The accuracy of this data is crucial for assessing the risk of electric shock and formulating corresponding safety measures. Furthermore, accurate initial contact current values ​​help to identify potential safety issues at an early stage, so that preventive measures can be taken during the design and construction stages, avoiding additional costs and time delays caused by later modifications. In the end, this method not only improves the safety of the metal water pipe system, but also reduces material usage and construction costs through optimized design, achieving a dual improvement in economic benefits and engineering efficiency.

[0110] S04: Check the initial contact current value according to the Diwang model to obtain the final contact current value.

[0111] As a preferred embodiment of the first embodiment, the initial contact current value is checked according to the Diwang model to obtain the final contact current value, specifically:

[0112] Obtain the node potential of the pipe section where the human body contacts according to the ground grid model;

[0113] Calculating a simulated contact current based on the node potential;

[0114] If the error between the initial contact current value and the simulated contact current value is less than or equal to a preset threshold, the initial contact current value is the final contact current value.

[0115] The simulated contact current is calculated according to the node potential, specifically:

[0116] Obtain the node potential of the pipe section where the human body contacts;

[0117] According to the node potential, the simulated contact current is calculated; wherein the calculation formula of the simulated contact current is:

[0118]

[0119] This application obtains the node potential of the human body contact pipe section through the ground grid model. This step simulates the distribution of current in the ground and water pipe system in the actual environment, thereby providing a more realistic current distribution picture. Next, these node potential data are used to calculate the simulated contact current. This step is to convert the theoretical data into a predictable current value through a mathematical model, so that the calculation result is closer to the actual situation in actual operation. Finally, by comparing the initial contact current value with the simulated contact current value, if the error between the two is less than or equal to the preset threshold, the accuracy of the initial contact current value can be confirmed, and then it can be determined as the final contact current value. This process not only improves the accuracy of the current value prediction, but also increases the safety of the entire system. Through this method, this application can ensure that in actual applications, the insulating joint configuration of the water pipe system can meet safety requirements, effectively reduce the risk of electric shock, and also improve the efficiency and economy of engineering design.

[0120] S05: Solving the objective function according to the final contact current value to obtain the number and installation positions of the insulating joints when the final contact current is at the maximum value.

[0121] As a preferred embodiment of the first embodiment, the objective function is solved according to the final contact current value to obtain the number and installation positions of the insulating joints at the maximum value of the final contact current, specifically:

[0122] In order to use the least number of insulating joints to prevent the risk of contact electricity caused by the transferred potential on the water pipe, the project uses formula (15) as the objective function to calculate the joint configuration scheme that minimizes the maximum value of the contact current on the water pipe under different numbers of insulating joints. The minimum number of insulating joints that meet the contact current safety and the corresponding configuration scheme are the optimal solutions.

[0123]

[0124] The genetic algorithm can be used to calculate the optimal solution, which is 10 insulating joints. The joint configuration positions are 1.4m, 7.8m, 16.9m, 31.8m, 54.5m, 75.6m, 145.2m, 158.6m, 228m, and 606.3m, respectively. The total length of the required water pipe with an inner insulation layer is 163.8m. In order to verify the effectiveness of the configuration scheme, the moment method is used to calculate the risk of electric shock under the optimal configuration scheme. The results are as follows: Figure 11-13 As shown, it can be seen that the above configuration scheme can effectively control the risk of transfer potential on the water pipe.

[0125] Fig.14 The maximum contact current of each pipe section calculated by formula (10) to (14) and moment method is compared in the figure. The calculation results are basically consistent, which verifies the validity of formula (10) to (14). The calculation error of contact current is large in the pipe section farthest from the power station. This is because the pipe section is long and the current flowing through it is large, which greatly reduces the potential difference between the pipeline and the ground surface. Fig.11 , while formula (10) does not consider the influence of the current flowing through the pipeline on the surface potential, so the calculated contact current is too large, which is conducive to obtaining a conservative configuration scheme.

[0126] Depend on Figure 11-13 It shows that the segmented insulation measure will divide the metal water pipe into multiple equipotential pipe sections, and the maximum contact current on each pipe section will appear at the insulating joints at both ends. Current will flow only in the water body near the insulating joint, and the current will flow into and out of the water body through the inner insulation layer in a small range on both sides of the insulating joint. For pipe sections with a large number of grounding points, the current flowing through the water pipe is much larger than the current in the water, and the current in the water mainly affects the contact current on the pipe section with a large grounding resistance. Segmented insulation will increase the step voltage near the insulating joint, but the current flowing through the water pipe is small, and the step voltage will not pose a safety risk.

[0127] This application can determine the required insulating joint configuration in the worst case (i.e. when the contact current reaches its maximum value), thereby reducing the use of insulating joints without sacrificing safety, reducing material costs and installation costs. At the same time, by accurately calculating the optimal installation position of the insulating joint, the electrical performance of the water pipe system is optimized, and the reliability and efficiency of the system are improved. In addition, this method also helps to simplify the construction process, shorten the project cycle, and make the maintenance and upgrade of the entire water pipe system more convenient, providing an economical and effective solution for the safety management of the power station and its surrounding areas.

[0128] S06: According to the number and installation positions of the insulating joints, configure the number of insulating joints at the installation positions of the metal water pipes.

[0129] This application obtains the axial resistance between two adjacent insulating joints to provide basic data for subsequent circuit simulation and ensure the accuracy of the circuit model. This application constructs an equivalent T-shaped circuit to simulate the circuit state when the human body contacts the water pipe, so that the contact current can be predicted more realistically. The initial contact current value is checked by the ground grid model, and the accuracy of the contact current is further corrected and verified, ensuring the consistency of the simulation results with the actual situation. On this basis, the final contact current value is used to solve the objective function, optimize the number and installation position of the insulating joints, and thus minimize the maximum contact current while ensuring safety. This solves the problem of difficulty in configuring the appropriate position and number of water pipe insulating joints in the prior art.

[0130] Embodiment 2

[0131] Please refer to Fig.15 , which is a configuration device for a water pipe insulating joint provided in an embodiment of the present application.

[0132] In this embodiment, the configuration device of the water pipe insulating joint includes an acquisition module 10 , a calculation module 20 , a checking module 30 , a solution module 40 and a configuration module 50 .

[0133] This embodiment adopts segmented insulation measures to increase the axial impedance of the water pipe, reduce the current flowing through the water pipe, and the possible contact current. Considering that the oil and gas industry has a mature pipeline insulation joint manufacturing process and the price of small-sized joints is low, in order to avoid using insulating pipes outside the station, the project uses insulating joints to segment the metal water pipe, and then uses the inner insulation layer to increase the axial impedance of the water pipe, such as Figure 2 As shown, L0 in the figure is the length of the pipe section between adjacent insulating joints.

[0134] The acquisition module 10 is used to acquire the axial resistance between two adjacent insulating joints.

[0135] As a preferred embodiment of the second embodiment, the axial resistance between two adjacent insulating joints is obtained by:

[0136] In order to analyze the effect of segmented insulation measures, a transmission line model is constructed Figure 3 In the equivalent circuit, R is the axial resistance of the water per unit length in the water pipe, G0=G+Gw, G is the radial conductance of the insulating layer per unit length of the water pipe, Gw is the radial conductance of the water per unit length of the water pipe, i is the current flowing through the water, u is the voltage acting on the inner insulating layer, and i and u satisfy equation 1.

[0137]

[0138] If the current is evenly distributed along the radial direction of the water pipe, the radial resistance is:

[0139]

[0140] The radial conductivity of water is much smaller than that of the insulating layer, so G in equation (1) w can be ignored, and formula (1) can be written as:

[0141]

[0142] If the pipe section between adjacent insulating joints is insulated from the ground, the current in the water at the insulating joints at both ends is equal, that is:

[0143] i(0)=i(L0) (4)

[0144] Combining equations (3) and (4), the axial resistance of the insulating pipe section between adjacent insulating joints to the ground is:

[0145]

[0146] If there is a grounding point or human contact in the pipe section between adjacent insulating joints, and all the current flows to the grounding point or human body, then:

[0147] i(L0)=0 (6)

[0148] Combining equations (3) and (6), the resistance of current flowing through the inner insulation layer is:

[0149]

[0150] The present application constructs an equivalent circuit containing an insulating joint through a transmission line model, and the present application ensures that the circuit model can truly reflect the electrical characteristics of the water pipe. The present application can consider in detail the influence of different materials and structures in the water pipe on the flow of current by obtaining the axial resistance of the water body per unit length in the water pipe, the radial conductance of the insulating layer per unit length in the water pipe, and the radial conductance of the water body per unit length in the water pipe in the equivalent circuit. Finally, by calculating the axial resistance between two adjacent insulating joints by combining these parameters, the present application can more accurately predict the distribution and flow of current in the water pipe. This precise resistance calculation makes the equivalent T-shaped circuit and ground grid model constructed in the subsequent steps closer to the actual working conditions, so that the installation position and number of the insulating joints finally determined can more effectively control the contact current and reduce the risk of electric shock. In addition, the high precision of this method also helps to reduce over-design and avoid unnecessary use of insulating joints, thereby saving costs and improving construction efficiency. Therefore, the present application not only improves the safety of the metal water pipe system, but also optimizes the economy and construction convenience.

[0151] The calculation module 20 is used to construct an equivalent T-shaped circuit according to the axial resistance and the first circuit; wherein the first circuit is a circuit when a human body is in contact with a water pipe.

[0152] As a preferred embodiment of the second embodiment, an equivalent T-shaped circuit is constructed according to the axial resistance and the first circuit; wherein the first circuit is a circuit when a human body is in contact with a water pipe, specifically: considering the general situation that a water pipe has a grounding point or human contact, the pipe section between adjacent insulating joints is equivalent to a T-shaped circuit, such as Figure 4 , R1 and R2 in the figure satisfy equation (8). For overhead water pipes laid in urban areas, the pipes and brackets are generally insulated at their contact points, and the ground current is small. Therefore, Ud in the figure is approximately the grounding point potential when there is no water pipe, and Rd is the grounding resistance.

[0153]

[0154] When the human body comes into contact with the water pipe, the equivalent circuit is as follows Figure 5 , the insulation segmentation measure can increase the axial impedance between different pipe sections and the radial impedance of the current flowing out of the water pipe, thereby reducing the contact current. Equations (5), (7) and (8) show that the effect of the segmented insulation measure is determined by the resistivity of the inner insulation layer and the length of the pipe section. If the thickness of the inner insulation layer is 3 mm, the axial and radial resistances of the pipe section under different inner insulation layer resistivities are as follows: Figure 6 . Figure 6 It shows that there is an obvious saturation trend in the axial and radial resistances, and only the inner insulation layer within a certain range close to the insulating joint is effective.

[0155] Adding insulating joints and internally insulated water pipes can increase the axial resistance of the water pipes, but it will increase the project cost. Therefore, it is necessary to reduce the number of insulating joints and the length of internally insulated water pipes while ensuring safety.

[0156] The calculation module 20 is used to calculate the initial contact current value according to the equivalent T-type circuit.

[0157] As a preferred embodiment of the second embodiment, the initial contact current value is calculated according to the equivalent T-type circuit, specifically:

[0158] When the water pipe is insulated from the ground, Figure 5 The contact current is obtained as:

[0159]

[0160] Formula (9) shows that the contact current increases with the distance between the grounding grid and the human foot, and decreases with the increase in the number of insulating joints. To configure the position of the insulating joint, this paper starts from the connection point between the water pipe and the grounding grid, checks the contact current in the process of moving away from the grounding grid, and uses an insulating joint at the corresponding position if the limit is reached.

[0161] Depend on Figure 7 It can be seen that the radial resistance is very large when the pipe section is short, while the saturation value of the axial resistance is limited. In order to make full use of the radial resistance, the axial resistance and the radial resistance are plotted on the same coordinates, and the pipe section length at the intersection is taken as the inner insulation layer length of each insulating joint, such as Figure 8 shown.

[0162] For overhead water pipes, if the resistivity of the inner insulation layer is 103Ω·m2, 104Ω·m2, and 105Ω·m2 respectively, the location of the insulating joint and the contact current at each point of the pipeline after configuration are as follows: Fig. 9 .

[0163] Fig.10 The figure shows the number of insulating joints required for the ground-insulated water pipe at each inner insulation layer resistance and the total length of the water pipe with inner insulation layer required. Fig. 9 The above is a configuration scheme for the segmented insulation measures with the shortest required length of the water pipe with inner insulation layer, and each insulating joint is installed at the farthest position from the power station under the condition of meeting safety requirements. If the insulating joint is to be installed near the power station, the distance between the connected insulating joints should be appropriately increased to avoid electric shock accidents.

[0164] If the water pipe is not insulated, it may be grounded through the bracket. Figure 5 And the node voltage method can be obtained:

[0165]

[0166] In formula (10), N is the number of pipe sections, which is 1 more than the number of insulating joints; i is the number of the pipe section in contact with the human body; xk, yk and Ua are as follows:

[0167] x k =1 / (R 1(k-1) +R 1k ) (11)

[0168]

[0169] After calculating the node potential ui of the pipe section where the human body contacts, the contact current flowing through the human body can be calculated:

[0170]

[0171] The construction of the equivalent T-shaped circuit of this application is based on a deep understanding of the electrical connection between the water pipe, the human body and the ground, so that the simulation results are closer to the actual situation. Secondly, the initial contact current value obtained by calculation can provide important basic data for the subsequent contact current optimization and insulation joint layout. The accuracy of this data is crucial for assessing the risk of electric shock and formulating corresponding safety measures. Furthermore, accurate initial contact current values ​​help to identify potential safety issues at an early stage, so that preventive measures can be taken during the design and construction stages, avoiding additional costs and time delays caused by later modifications. In the end, this method not only improves the safety of the metal water pipe system, but also reduces material usage and construction costs through optimized design, achieving a dual improvement in economic benefits and engineering efficiency.

[0172] The checking module 30 is used to check the initial contact current value according to the Diwang model to obtain the final contact current value.

[0173] As a preferred embodiment of the second embodiment, the initial contact current value is checked according to the Diwang model to obtain the final contact current value, which is specifically:

[0174] Obtain the node potential of the pipe section where the human body contacts according to the ground grid model;

[0175] Calculating a simulated contact current based on the node potential;

[0176] If the error between the initial contact current value and the simulated contact current value is less than or equal to a preset threshold, the initial contact current value is the final contact current value.

[0177] The simulated contact current is calculated according to the node potential, specifically:

[0178] Obtain the node potential of the pipe section where the human body contacts;

[0179] According to the node potential, the simulated contact current is calculated; wherein the calculation formula of the simulated contact current is:

[0180]

[0181] This application obtains the node potential of the human body contact pipe section through the ground grid model. This step simulates the distribution of current in the ground and water pipe system in the actual environment, thereby providing a more realistic current distribution picture. Next, these node potential data are used to calculate the simulated contact current. This step is to convert the theoretical data into a predictable current value through a mathematical model, so that the calculation result is closer to the actual situation in actual operation. Finally, by comparing the initial contact current value with the simulated contact current value, if the error between the two is less than or equal to the preset threshold, the accuracy of the initial contact current value can be confirmed, and then it can be determined as the final contact current value. This process not only improves the accuracy of the current value prediction, but also increases the safety of the entire system. Through this method, this application can ensure that in actual applications, the insulating joint configuration of the water pipe system can meet safety requirements, effectively reduce the risk of electric shock, and also improve the efficiency and economy of engineering design.

[0182] The solution module 40 is used to solve the objective function according to the final contact current value to obtain the number and installation positions of the insulating joints when the final contact current is at the maximum value.

[0183] As a preferred embodiment of the second embodiment, the objective function is solved according to the final contact current value to obtain the number and installation positions of the insulating joints at the maximum value of the final contact current, specifically:

[0184] In order to use the least number of insulating joints to prevent the risk of contact electricity caused by the transferred potential on the water pipe, the project uses formula (15) as the objective function to calculate the joint configuration scheme that minimizes the maximum value of the contact current on the water pipe under different numbers of insulating joints. The minimum number of insulating joints that meet the contact current safety and the corresponding configuration scheme are the optimal solutions.

[0185]

[0186] The genetic algorithm can be used to calculate the optimal solution, which is 10 insulating joints. The joint configuration positions are 1.4m, 7.8m, 16.9m, 31.8m, 54.5m, 75.6m, 145.2m, 158.6m, 228m, and 606.3m, respectively. The total length of the required water pipe with an inner insulation layer is 163.8m. In order to verify the effectiveness of the configuration scheme, the moment method is used to calculate the risk of electric shock under the optimal configuration scheme. The results are as follows: Figure 11-13 As shown, it can be seen that the above configuration scheme can effectively control the risk of transfer potential on the water pipe.

[0187] Fig.14The maximum contact current of each pipe section calculated by formula (10) to (14) and moment method is compared in the figure. The calculation results are basically consistent, which verifies the validity of formula (10) to (14). The calculation error of contact current is large in the pipe section farthest from the power station. This is because the pipe section is long and the current flowing through it is large, which greatly reduces the potential difference between the pipeline and the ground surface. Fig.11 , while formula (10) does not consider the influence of the current flowing through the pipeline on the surface potential, so the calculated contact current is too large, which is conducive to obtaining a conservative configuration scheme.

[0188] Depend on Figure 11-13 It shows that the segmented insulation measure will divide the metal water pipe into multiple equipotential pipe sections, and the maximum contact current on each pipe section will appear at the insulating joints at both ends. Current will flow only in the water body near the insulating joint, and the current will flow into and out of the water body through the inner insulation layer in a small range on both sides of the insulating joint. For pipe sections with a large number of grounding points, the current flowing through the water pipe is much larger than the current in the water, and the current in the water mainly affects the contact current on the pipe section with a large grounding resistance. Segmented insulation will increase the step voltage near the insulating joint, but the current flowing through the water pipe is small, and the step voltage will not pose a safety risk.

[0189] This application can determine the required insulating joint configuration in the worst case (i.e. when the contact current reaches its maximum value), thereby reducing the use of insulating joints without sacrificing safety, reducing material costs and installation costs. At the same time, by accurately calculating the optimal installation position of the insulating joint, the electrical performance of the water pipe system is optimized, and the reliability and efficiency of the system are improved. In addition, this method also helps to simplify the construction process, shorten the project cycle, and make the maintenance and upgrade of the entire water pipe system more convenient, providing an economical and effective solution for the safety management of the power station and its surrounding areas.

[0190] The configuration module 50 is used to configure the number of insulating joints at the installation position of the metal water pipe according to the number and installation position of the insulating joints.

[0191] This device uses five modules to divide the work and coordinate work to better configure the appropriate position and number of water pipe insulating joints. This application provides basic data for subsequent circuit simulation by obtaining the axial resistance between two adjacent insulating joints, thereby ensuring the accuracy of the circuit model. This application constructs an equivalent T-shaped circuit to simulate the circuit state when the human body contacts the water pipe, so that the contact current can be predicted more realistically. The initial contact current value is checked by the ground grid model, and the accuracy of the contact current is further corrected and verified, ensuring the consistency of the simulation results with the actual situation. On this basis, the final contact current value is used to solve the objective function, optimize the number and installation position of the insulating joints, and thereby minimize the maximum contact current while ensuring safety. This solves the problem that it is difficult to configure the appropriate position and number of water pipe insulating joints in the prior art.

[0192] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for configuring a water pipe insulating joint, characterized in that: include: Obtaining the axial resistance between two adjacent insulating joints; An equivalent T-shaped circuit is constructed according to the axial resistance and the first circuit; wherein the first circuit is a circuit when a human body is in contact with a water pipe; According to the equivalent T-type circuit, an initial contact current value is calculated; Check the initial contact current value according to the Diwang model to obtain a final contact current value; Solving the objective function according to the final contact current value to obtain the number and installation positions of the insulating joints at the maximum value of the final contact current; According to the number and installation positions of the insulating joints, the number of insulating joints are arranged at the installation positions of the metal water pipes.

2. The method for configuring a water pipe insulating joint according to claim 1, characterized in that: The step of obtaining the axial resistance between two adjacent insulating joints is specifically as follows: Construct an equivalent circuit containing an insulating joint based on the transmission line model; Obtaining the axial resistance of the water body per unit length in the water pipe, the radial conductance of the insulating layer per unit length in the water pipe, and the radial conductance of the water body per unit length in the water pipe in the equivalent circuit; The axial resistance between two adjacent insulating joints is calculated and obtained according to the axial resistance, the radial conductance of the insulating layer per unit length of the water pipe, and the radial conductance of the water body per unit length of the water pipe.

3. The method for configuring a water pipe insulating joint according to claim 1, characterized in that: The initial contact current value is checked according to the Diwang model to obtain the final contact current value, which is specifically: Obtain the node potential of the pipe section where the human body contacts according to the ground grid model; Calculating a simulated contact current based on the node potential; If the error between the initial contact current value and the simulated contact current value is less than or equal to a preset threshold, the initial contact current value is the final contact current value.

4. The method for configuring a water pipe insulating joint according to claim 3, characterized in that: The simulated contact current is calculated according to the node potential, specifically: Obtain the node potential of the pipe section where the human body contacts; According to the node potential, the simulated contact current is calculated; wherein the calculation formula of the simulated contact current is: Among them, i is the number of the pipe section that the human body contacts, u i is the node potential of the pipe section where the human body contacts, I ji is the contact current flowing through the human body, R H is the human body resistance, R F is the grounding resistance of human feet, R 2i is the first equivalent resistance value, R di is the second equivalent resistance value, U di is the voltage value of the first contact current circuit, U dH is the voltage value of the second contact current loop.

5. A device for configuring a water pipe insulating joint, characterized in that: It includes an acquisition module, a calculation module, a verification module, a solution module and a configuration module; The acquisition module is used to acquire the axial resistance between two adjacent insulating joints; The calculation module is used to construct an equivalent T-shaped circuit according to the axial resistance and the first circuit; wherein the first circuit is a circuit when a human body contacts a water pipe; and the initial contact current value is calculated according to the equivalent T-shaped circuit; The checking module is used to check the initial contact current value according to the Diwang model to obtain the final contact current value; The solution module is used to solve the objective function according to the final contact current value to obtain the number and installation positions of the insulating joints when the final contact current is at the maximum value; The configuration module is used to configure the number of insulating joints at the installation position of the metal water pipe according to the number and installation position of the insulating joints.

6. The water pipe insulating joint configuration device according to claim 5, characterized in that: The step of obtaining the axial resistance between two adjacent insulating joints is specifically as follows: Construct an equivalent circuit containing an insulating joint based on the transmission line model; Obtaining the axial resistance of the water body per unit length in the water pipe, the radial conductance of the insulating layer per unit length in the water pipe, and the radial conductance of the water body per unit length in the water pipe in the equivalent circuit; The axial resistance between two adjacent insulating joints is calculated and obtained according to the axial resistance, the radial conductance of the insulating layer per unit length of the water pipe, and the radial conductance of the water body per unit length of the water pipe.

7. The water pipe insulating joint configuration device according to claim 5, characterized in that: The initial contact current value is checked according to the Diwang model to obtain the final contact current value, which is specifically: Obtain the node potential of the pipe section where the human body contacts according to the ground grid model; Calculating a simulated contact current based on the node potential; If the error between the initial contact current value and the simulated contact current value is less than or equal to a preset threshold, the initial contact current value is the final contact current value.

8. The water pipe insulating joint configuration device according to claim 7, characterized in that: The simulated contact current is calculated according to the node potential, specifically: Obtain the node potential of the pipe section where the human body contacts; According to the node potential, the simulated contact current is calculated; wherein the calculation formula of the simulated contact current is: Among them, i is the number of the pipe section that the human body contacts, u i is the node potential of the pipe section where the human body contacts, I ji is the contact current flowing through the human body, R H is the human body resistance, R F is the grounding resistance of human feet, R 2i is the first equivalent resistance value, R di is the second equivalent resistance value, U di is the voltage value of the first contact current circuit, U dH is the voltage value of the second contact current loop.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the method for configuring the water pipe insulating joint according to any one of claims 1 to 4.

10. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the method for configuring the water pipe insulating joint according to any one of claims 1 to 4 when executing the computer program.

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