Power transmission line support stress calculation method and device, storage medium and processor

Abstract

The application discloses a power transmission line support stress calculation method and device, a storage medium and a processor. The method comprises the following steps: acquiring line parameters; determining static load and transient load based on the line parameters; and comparing and processing the static load and the transient load to determine a target load, wherein the target load is used to represent the stress condition of the power transmission line support. The application solves the technical problem of low calculation accuracy of the existing power transmission line support stress calculation method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage power transmission and distribution, in particular to a power transmission line support stress calculation method and device, a storage medium and a processor. BACKGROUND

[0002] The traditional overhead line power transmission system power supply mode has undergone major changes and gradually developed towards the ground, that is, the cable tunnel mode. The cable needs to be arranged on the cable support according to a certain arrangement mode when passing through the tunnel. The support not only meets the supporting function, but also needs to withstand the relevant stress conditions under different operating modes, and the metal support can better meet the technical conditions.

[0003] With the increase of load demand, the transmission capacity also increases, and thus the original power grid planning needs to be adjusted. Usually, a tunnel will be laid with multiple voltage grade cable lines, and with the increase of capacity, more and more large-section power supply lines, the weight of the line increases, and the strength requirement of the cable support and other equipment gradually increases. The existing cable support stress calculation method has low accuracy and has safety hazards.

[0004] At present, no effective solution has been proposed for the above problems. SUMMARY

[0005] The embodiments of the present application provide a power transmission line support stress calculation method and device, a storage medium and a processor to at least solve the technical problem of low calculation accuracy of the existing power transmission line support stress calculation method.

[0006] According to an aspect of an embodiment of the present application, a power transmission line support stress calculation method is provided, comprising: obtaining line parameters; determining static load and transient load based on the line parameters; comparing and processing the static load and the transient load to determine target load, wherein the target load is used to represent the stress condition of the power transmission line support.

[0007] Optionally, the static load is determined based on the line parameters, comprising: determining the gravity load, construction load and steady-state electric dynamic force load of the target line based on the line parameters; calculating the sum of the gravity load, the construction load and the steady-state electric dynamic force load to obtain the static load.

[0008] Optionally, the gravity load, construction load and steady-state electric dynamic force load of the target line are determined based on the line parameters, comprising: calculating the gravity load by using the cable uneven correction coefficient, the support uneven correction coefficient, the cable weight, the number of cables and the cable support spacing length; calculating the construction load by using the construction load coefficient and the gravity load; and calculating the steady-state electric dynamic force load by using the adjacent cable conductor spacing, the rated current and the vacuum permeability.

[0009] Optionally, the determining the transient load based on the line parameters comprises: determining a gravity load and a dynamic electric force load of the target line based on the line parameters; and performing calculation and processing on the gravity load, the dynamic electric force load and a deformation time coefficient to obtain the transient load.

[0010] Optionally, the determining the gravity load and the dynamic electric force load of the target line based on the line parameters comprises: calculating the gravity load by using a cable uneven correction coefficient, a support uneven correction coefficient, a cable weight, a cable number and a cable support spacing length; and calculating the dynamic electric force load by using a short-circuit current amplitude, a vacuum permeability and the cable support spacing length.

[0011] Optionally, the comparing the static load and the transient load to determine the target load comprises: comparing the static load and the transient load to obtain a comparison result; if the comparison result is that the static load is less than the transient load, determining that the transient load is the target load; and if the comparison result is that the static load is greater than the transient load, determining that the static load is the target load.

[0012] According to another aspect of the embodiments of the present application, there is also provided a power transmission line support force calculation device, comprising: an acquisition module configured to acquire line parameters; a determination module configured to determine a static load and a transient load based on the line parameters; and a comparison module configured to compare the static load and the transient load to determine a target load, wherein the target load is used to represent a force condition of a power transmission line support.

[0013] According to another aspect of the embodiments of the present application, there is also provided a non-volatile storage medium, which stores a plurality of instructions, and the instructions are adapted to be loaded and executed by a processor to perform any of the power transmission line support force calculation methods.

[0014] According to another aspect of the embodiments of the present application, there is also provided a processor, which is used to run a program, wherein the program is set to perform any of the power transmission line support force calculation methods when running.

[0015] According to another aspect of the embodiments of the present application, there is also provided an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is set to run the computer program to perform any of the power transmission line support force calculation methods.

[0016] In the embodiment of the present application, the line parameters are acquired; the static load and the transient load are determined based on the line parameters; the target load is determined by comparing the static load and the transient load, wherein the target load is used to represent the stress condition of the power transmission line support, so as to calculate the stress form of the support under the steady state and the short-circuit transient state during the operation of the cable, thereby realizing the technical effect of accurately calculating the stress condition of the power transmission line support, and further solving the technical problem of low calculation accuracy of the power transmission line support stress calculation method in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0018] Figure 1 It is a flowchart of a power transmission line support stress calculation method according to the embodiment of the present application;

[0019] Figure 2 It is an optional cable support static force diagram according to the embodiment of the present application;

[0020] Figure 3 It is an optional cable support transient force diagram according to the embodiment of the present application;

[0021] Figure 4 It is an optional cable support dynamic transient diagram under a short-circuit state according to the embodiment of the present application;

[0022] Figure 5 It is an optional static force cable support stress diagram according to the embodiment of the present application;

[0023] Figure 6 It is an optional transient force cable support stress diagram according to the embodiment of the present application;

[0024] Figure 7 It is a structural diagram of a power transmission line support stress calculation device according to the embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to enable the persons in the technical field to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the persons in the field without creative labor should belong to the protection scope of the present application.

[0026] It is to be understood that the terminology "first", "second" and the like used throughout this specification and the accompanying drawings is merely for distinguishing between similar objects of the application and is not intended to denote a specific order or sequence. It is to be understood that the data used herein can be interchanged, where appropriate, so that the embodiments of the application described herein can be carried out in other than the order described. Additionally, the terms "comprise" and "include" and variations thereof, as well as the terms "contain" and "comprise" and variations thereof, are intended to be open-ended, and include the presence of items or components that are not expressly recited or that are not otherwise inherent. It is to be understood that such embodiments are only examples of the inventive subject matter and are not intended to limit or restrict the scope of the application in any way.

[0027] Embodiment 1

[0028] According to the embodiments of the present application, there is provided a power transmission line support stress calculation method, 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 herein can be executed in an order different from that shown herein.

[0029] Figure 1 is a flowchart of a power transmission line support stress calculation method according to an embodiment of the present application, as shown in the figure, the method comprises the following steps: Figure 1

[0030] Step S102, acquiring line parameters;

[0031] Step S104, determining static load and transient load based on the above-mentioned line parameters;

[0032] Step S106, comparing and processing the static load and the transient load to determine the target load, wherein the target load is used to represent the stress condition of the power transmission line support.

[0033] In the embodiments of the present application, the execution subject of the power transmission line support stress calculation method of the above-mentioned steps S102 to S108 is a power transmission line support stress calculation system, the above-mentioned system is used to acquire line parameters; determine static load and transient load based on the above-mentioned line parameters; compare and process the static load and the transient load to determine the target load, wherein the target load is used to represent the stress condition of the power transmission line support.

[0034] ​As an optional embodiment, the force of the power transmission line support includes gravity load (body gravity, cable gravity), construction load, and electric force load under steady state and fault operation conditions. According to the working condition and action time of the above-mentioned force, the force can be divided into two categories: static force and transient force. The action size and time of the two types of forces are different under different working conditions, and the maximum load is taken as the calculation result of the final force of the line support. Among them, the static force G J includes: gravity load determined by the support and cable material and structure size, construction load generated during maintenance process, steady state electric force load related to the size of steady state operation load and wiring form; the transient force G S includes: dynamic load related to the fault operation state (especially the short circuit fault operation state) and gravity load.

[0035] It should be noted that, on the basis of analyzing the characteristics of cable laying, the force form and characteristics of the support under the steady state and short circuit transient state during the operation of the cable are studied, the force law of the cable support under the transient state and the steady state of the cable is revealed, and on this basis, the adjustable cable support designed is simulated and analyzed, which lays a theoretical foundation for the optimization design of the subsequent adjustable cable support, and the research on the electric force mechanical stress of the cable support also has very important practical significance.

[0036] Optionally, the static load G J of the power transmission line support is calculated according to the following formula (1):

[0037] G J =G d +F S +F W (1)

[0038] In formula (1), G d is the gravity load, F S is the construction load, and F W is the steady state electric force load.

[0039] Optionally, the transient load G S of the power transmission line support is calculated according to the following formula (2):

[0040] G S =G d +αF B (2)

[0041] In formula (2), G d is the gravity load, F B is the dynamic electric force load related to the short circuit fault operation state, and α is the deformation time coefficient of the short circuit force, which is in the range of 0.5-0.8.

[0042] Optionally, α is a positive number less than or equal to 1, after the short-circuit fault occurs, the decay component accounts for about 50% of the short-circuit current, and the decay component can be reduced to more than 60% of the original after 3 power frequency cycles. At the same time, after the three-phase short-circuit fault occurs (the maximum damage fault), the protection device can realize protection tripping within 1 second. For the above reasons, combined with simulation and expert experience, the value of 0.5-0.8 can more accurately reflect the torque action characteristics.

[0043] In an optional embodiment, determining the static load based on the line parameters comprises: determining the gravity load, the construction load and the steady-state electric dynamic load of the target line based on the line parameters; and calculating the sum of the gravity load, the construction load and the steady-state electric dynamic load to obtain the static load.

[0044] In an optional embodiment, determining the gravity load, the construction load and the steady-state electric dynamic load of the target line based on the line parameters comprises: calculating the gravity load by using a cable uneven correction coefficient, a support uneven correction coefficient, a cable weight, a cable number and a cable support spacing length; calculating the construction load by using a construction load coefficient and the gravity load; and calculating the steady-state electric dynamic load by using an adjacent cable conductor spacing, a rated current and a vacuum permeability.

[0045] As an optional embodiment, the calculation method of the gravity load G d is as follows:

[0046] G d =β1β2ng1l (3)

[0047] In formula (3), β1 is a cable serpentine and support uneven correction coefficient, β2 is a support uneven correction coefficient, g1 is a cable unit length weight, n is a number of cables per layer, and l is a cable support spacing length.

[0048] Optionally, based on the above scheme, the calculation method of the construction load F S is as follows:

[0049] F S =aG d (4)

[0050] In formula (4), m is the mass of a construction worker, g is the acceleration of gravity, and a is a construction load coefficient, and the value range is 0.5-0.7.

[0051] Optionally, a is a construction load coefficient, which is mainly determined by two factors, the first is the acceleration torque generated by the cable falling during construction, and the personnel gravity torque generated by the personnel stepping, and the two torques are basically not generated at the same time. Due to the long cable line and the certain hardness of the material, the acceleration of the cable falling during construction is smaller than the free-fall acceleration. According to the actual test data and expert experience, the value of 0.5-0.7 is more reasonable, and the value thereof is usually inversely proportional to the cable strength. If F S ≤G0, then F S =G0; G0<800N, which is the basic equivalent gravity load of the human body.

[0052] In an optional embodiment, the determination of the transient load based on the line parameters includes: determining the gravity load and the dynamic electrodynamic load of the target line based on the line parameters; and performing calculation and processing on the gravity load, the dynamic electrodynamic load, and a deformation time coefficient to obtain the transient load.

[0053] In an optional embodiment, the determination of the gravity load and the dynamic electrodynamic load of the target line based on the line parameters includes: calculating the gravity load by using a cable uneven correction coefficient, a support uneven correction coefficient, a cable weight, a cable number, and a cable support spacing length; and calculating the dynamic electrodynamic load by using a short-circuit current amplitude, a vacuum permeability, and a cable support spacing length.

[0054] As an optional embodiment, the calculation method of the steady-state electrodynamic load F w is as follows:

[0055]

[0056] In formula (5), D is the distance between adjacent cable conductors, I0 is the rated current effective value, and μ0 is the vacuum permeability.

[0057] Optionally, based on the above scheme, the calculation method of the dynamic electrodynamic load F B related to the short-circuit fault operating state is as follows:

[0058]

[0059] In formula (6), I m is the short-circuit current amplitude, and the expression is as follows:

[0060]

[0061] In formula (7), U is the system power phase voltage, and Z is the short-circuit impedance.

[0062] In an alternative embodiment, the comparing the static load and the transient load to determine the target load comprises: comparing the static load and the transient load to obtain a comparison result; if the comparison result is that the static load is less than the transient load, determining the transient load as the target load; and if the comparison result is that the static load is greater than the transient load, determining the static load as the target load.

[0063] As an alternative embodiment, the G J obtained by comparison S is the final load G 0z of the power transmission line support, specifically: when G J < G S , G 0z = G S ; when G J ≥ G S , G 0z = G J .

[0064] As an alternative embodiment, taking a 220kV cable power transmission line as an example, the number of cables n in each layer is 3; the cable serpentine and support uneven correction coefficient β1=1.05, the support uneven correction coefficient β2=1, g1=365, the cable support spacing length l=2m, thus the gravity load G d is 770N; the construction load coefficient a=0.5, thus the construction load F S is 385N, the stable operation current is 1000A, thus the steady-state electric dynamic force load F W is 80N, thus the maximum static load G J of the power transmission line support is 1235N, the schematic diagram is shown in Figure 2 , and the stress characteristic analysis is shown in Figure 5 . When the line occurs a three-phase short-circuit fault, the short-circuit current is 20000A, the dynamic electric dynamic force load F B is 1600N, the time deformation coefficient is 0.8, as shown in Figure 4 , the maximum transient load G S received by the support at this time is 2050N, the schematic diagram is shown in Figure 3 , the short-circuit electric dynamic force action time is set to 0.5s, thus the stress characteristic diagram is shown in Figure 6 . At this time, G J < G S , the final load G 0z of the power transmission line support is G S , i.e. 2050N.

[0065] Embodiment 2

[0066] According to the power transmission line support stress calculation method and the device thereof, the stress of the power transmission line support can be calculated, and the stress of the power transmission line support can be determined. Figure 7 According to the power transmission line support stress calculation device, the stress of the power transmission line support can be calculated, and the stress of the power transmission line support can be determined. Figure 7 The power transmission line support stress calculation device includes an obtaining module 70, a determining module 72, and a comparison module 74.

[0067] The obtaining module 70 is configured to obtain line parameters.

[0068] The determining module 72 is configured to determine static loads and transient loads based on the line parameters.

[0069] The comparison module 74 is configured to compare the static loads and the transient loads to determine target loads, where the target loads are used to represent the stress of the power transmission line support.

[0070] It should be noted that the obtaining module 70, the determining module 72, and the comparison module 74 correspond to the steps S102 to S106 in Embodiment 1, and the instances and application scenarios realized by the modules and the corresponding steps are the same, but are not limited to the contents disclosed in Embodiment 1. It should be noted that the modules can run in a computer terminal as part of the device.

[0071] It should be noted that the optional or preferred implementation of the present embodiment can refer to the related description in Embodiment 1, which will not be repeated here.

[0072] The power transmission line support stress calculation device can further include a processor and a memory, and the obtaining module 70, the determining module 72, and the comparison module 74 are stored in the memory as program units, and the processor executes the program units stored in the memory to realize the corresponding functions.

[0073] The processor includes a core, and the core retrieves the corresponding program units from the memory. The core can be one or more. The memory can include a non-persistent memory in a computer readable medium, a random access memory (RAM), and / or a non-volatile memory such as a read-only memory (ROM) or a flash memory (flash RAM). The memory includes at least one memory chip.

[0074] According to the present application, an embodiment of a non-volatile storage medium is provided. Optionally, in the present embodiment, the non-volatile storage medium includes a stored program, where the program controls the device in which the non-volatile storage medium is located to execute any of the power transmission line support stress calculation methods when the program is running.

[0075] Optionally, in the embodiment, the non-volatile storage medium can be located in any one of the computer terminals in the computer terminal group in the computer network, or in any one of the mobile terminals in the mobile terminal group, and the non-volatile storage medium includes a stored program.

[0076] Optionally, the device where the non-volatile storage medium is located performs the following functions when the program is running: obtaining line parameters; determining static load and transient load based on the line parameters; and comparing the static load and the transient load to determine a target load, wherein the target load is used to represent the stress condition of the power transmission line support.

[0077] Optionally, the device where the non-volatile storage medium is located performs the following functions when the program is running: determining the gravity load, construction load, and steady-state electric dynamic force load of the target line based on the line parameters; and calculating the sum of the gravity load, the construction load, and the steady-state electric dynamic force load to obtain the static load.

[0078] Optionally, the device where the non-volatile storage medium is located performs the following functions when the program is running: calculating the gravity load using the cable unevenness correction coefficient, the support unevenness correction coefficient, the cable weight, the number of cables, and the cable support spacing length; calculating the construction load using the construction load coefficient and the gravity load; and calculating the steady-state electric dynamic force load using the adjacent cable conductor spacing, the rated current, and the vacuum permeability.

[0079] Optionally, the device where the non-volatile storage medium is located performs the following functions when the program is running: determining the gravity load and dynamic electric dynamic force load of the target line based on the line parameters; and calculating and processing the gravity load, dynamic electric dynamic force load, and deformation time coefficient to obtain the transient load.

[0080] Optionally, the device where the non-volatile storage medium is located performs the following functions when the program is running: calculating the gravity load using the cable unevenness correction coefficient, the support unevenness correction coefficient, the cable weight, the number of cables, and the cable support spacing length; and calculating the dynamic electric dynamic force load using the short-circuit current amplitude, the vacuum permeability, and the cable support spacing length.

[0081] Optionally, the device where the non-volatile storage medium is located performs the following functions when the program is running: comparing the static load and the transient load to obtain a comparison result; if the comparison result is that the static load is less than the transient load, determining that the transient load is the target load; and if the comparison result is that the static load is greater than the transient load, determining that the static load is the target load.

[0082] According to the embodiments of the present application, an embodiment of a processor is further provided. Optionally, in the embodiment, the processor is used to run a program, wherein the program performs any of the power transmission line support stress calculation methods when running.

[0083] According to the embodiments of the present application, an embodiment of an electronic device is further provided, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to perform any of the power transmission line support stress calculation methods.

[0084] According to the embodiments of the present application, an embodiment of a computer program product is further provided, which is adapted to perform the program of initializing any of the power transmission line support stress calculation method steps when executed on a data processing device.

[0085] The serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0086] In the above embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0087] In the several embodiments provided by the present application, it should be understood that the disclosed technology can be implemented in other ways. Of course, the unit embodiment described above is only illustrative, and for example, the division of units can be a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, unit or module, and can be electrical or other forms.

[0088] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0089] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0090] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, essentially or in other words, the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to make a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0091] The above description is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A method for calculating stress of a power transmission line support, characterized by, The method comprises: acquiring line parameters; determining static load and transient load based on the line parameters; comparing the static load and the transient load to determine target load, wherein the target load is used to represent the stress condition of the power transmission line support; wherein the determination of the static load based on the line parameters comprises: determining the gravity load, construction load and steady-state electric dynamic force load of the target line based on the line parameters; and calculating the sum of the gravity load, the construction load and the steady-state electric dynamic force load to obtain the static load; wherein the determination of the transient load based on the line parameters comprises: determining the gravity load and dynamic electric dynamic force load of the target line based on the line parameters; and calculating and processing the gravity load, dynamic electric dynamic force load and deformation time coefficient to obtain the transient load.

2. The method of claim 1, wherein, The determination of the gravity load, construction load and steady-state electric dynamic force load of the target line based on the line parameters comprises: calculating the gravity load by using the cable uneven correction coefficient, support uneven correction coefficient, cable weight, cable number and cable support spacing length; calculating the construction load by using the construction load coefficient and the gravity load; calculating the steady-state electric dynamic force load by using the adjacent cable conductor spacing, rated current and vacuum permeability.

3. The method of claim 1, wherein, The determination of the gravity load and dynamic electric dynamic force load of the target line based on the line parameters comprises: calculating the gravity load by using the cable uneven correction coefficient, support uneven correction coefficient, cable weight, cable number and cable support spacing length; calculating the dynamic electric dynamic force load by using the short-circuit current amplitude, vacuum permeability and cable support spacing length.

4. The method of claim 1, wherein, The comparison of the static load and the transient load to determine the target load comprises: comparing the static load and the transient load to obtain a comparison result; if the comparison result is that the static load is less than the transient load, determining the transient load as the target load; if the comparison result is that the static load is greater than the transient load, determining the static load as the target load.

5. A power transmission line support stress calculation device characterized by comprising: The method comprises: an acquisition module configured to acquire line parameters; a determination module configured to determine static load and transient load based on the line parameters; a comparison module configured to compare the static load and the transient load to determine target load, wherein the target load is used to represent the stress condition of the power transmission line support; wherein the determination module is further configured to determine the gravity load, construction load and steady-state electric dynamic force load of the target line based on the line parameters; and calculate the sum of the gravity load, the construction load and the steady-state electric dynamic force load to obtain the static load; wherein the determination module is further configured to determine the gravity load and dynamic electric dynamic force load of the target line based on the line parameters; and calculate and process the gravity load, dynamic electric dynamic force load and deformation time coefficient to obtain the transient load.

6. A non-volatile storage medium, characterized by, The non-volatile storage medium stores a plurality of instructions, which are suitable for being loaded and executed by the processor to perform the power transmission line support stress calculation method in any one of claims 1 to 4.

7. A processor, comprising: The processor is configured to run a program, wherein the program is configured to execute the power transmission line support stress calculation method in any one of claims 1 to 4 when running.

8. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to run the computer program to execute the power transmission line support stress calculation method in any one of claims 1 to 4.

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