Casing external insulation gap distance calculation method and system based on gap coefficient method
The gap coefficient method was used to calculate the external insulation gap distance of the bushing, which solved the problem of slow progress in the localization of bushings in high-altitude areas and enabled rapid and economical bushing design.
Patent Information
- Application Number
- CN202510833756.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-20
- Publication Date
- 2025-11-14
AI Technical Summary
In ultra-high voltage projects at high altitudes, it is difficult to conduct full-scale tests on the external insulation gap distance of bushings, which slows down the localization process of bushings and makes the tests time-consuming and labor-intensive, affecting the progress of project construction.
The gap distance of the bushing's outer insulation is calculated by using the gap coefficient method, which involves calculating the operating impulse withstand voltage of the bushing at high altitudes, correcting the discharge voltage, and combining the relationship between the equalizing ring gap coefficient and the ring diameter and pipe diameter.
This provides a fast and economical method for calculating the external insulation gap distance of bushings, saving time and costs and supporting the localization process of bushings.
Smart Images
Figure CN120948973A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of high voltage and insulation technology, and more specifically, to a method and system for calculating the external insulation gap distance of bushings based on the gap coefficient method. Background Technology
[0002] As one of the representatives of the national new infrastructure strategy, ultra-high voltage (UHV) power transmission projects play a role in optimizing the power grid structure and allocating energy resources across regions. These projects have been vigorously promoted in recent years and are expanding into high-altitude areas. Alongside the construction of UHV projects in high-altitude regions, significant research results have been achieved in a series of related key technologies, and the development of some high-end equipment has been effectively solved, greatly accelerating the localization of equipment.
[0003] However, due to the late start of research on bushings and the numerous factors considered in bushing design, the localization rate of bushings in the UHV field is very low. Furthermore, UHV projects in high-altitude areas face even greater difficulties, requiring high-altitude full-scale testing to overcome technical challenges such as bushing external insulation selection, and to verify the technical parameters of the bushings to be used in the project. The short testing window at high altitudes, susceptibility to weather conditions, difficulties in equipment transportation, and the time-consuming and labor-intensive nature of testing undoubtedly require a significant amount of time for related research and development and testing, which will also delay the construction date of UHV projects.
[0004] The aforementioned problems indicate that it is relatively difficult to conduct full-scale experimental research on high-altitude ultra-high voltage bushings to determine the distance of the outer insulation gap of the bushing. Summary of the Invention
[0005] To address the above problems, this invention proposes a method for calculating the bushing external insulation gap distance based on the gap coefficient method, comprising:
[0006] The operating impulse withstand voltage of the high-altitude casing is determined, and the 50% operating impulse discharge voltage is calculated based on the operating impulse withstand voltage. The 50% operating impulse discharge voltage is then corrected to obtain the discharge voltage required under standard meteorological conditions.
[0007] Based on the calculation formula of 50% operating impulse discharge voltage of the rod-plate gap under standard meteorological conditions and the relationship between the equalizing ring gap coefficient and the ring diameter and pipe diameter, the calculation formula of 50% operating impulse discharge voltage of the equalizing ring at the end of the bushing to the ground under standard meteorological conditions is determined.
[0008] Let the required discharge voltage under standard meteorological conditions be equal to 50% of the operating impulse discharge voltage of the bushing end equalizing ring to ground. Based on the calculation formula of the required discharge voltage under standard meteorological conditions and 50% of the operating impulse discharge voltage of the bushing end equalizing ring to ground, the gap distance of the outer insulation of the bushing at high altitude is obtained.
[0009] Optionally, the calculation formula for the 50% discharge voltage of the operational impulse is derived based on the operational impulse withstand voltage, as follows:
[0010]
[0011] Among them, U 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
[0012] Optionally, the formula for calculating the correction factor for correcting the 50% discharge voltage of the operational impact is as follows:
[0013]
[0014] Where, k a Here, H is the altitude of the installation site, and m is the correction factor.
[0015] Optionally, the correction formula for correcting the 50% discharge voltage of the operational impact is as follows:
[0016]
[0017] Among them, U 50％0 k is the discharge voltage required under standard meteorological conditions. a Here, H is the altitude of the installation site, m is the correction factor, and U is the correction factor. 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
[0018] Optionally, the formula for calculating 50% of the operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions is as follows:
[0019] U 50％棒板 =500d 0.6
[0020] Among them, U 50％棒板 The voltage is 50% of the operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions, and d is the gap distance.
[0021] Optionally, the calculation formula for 50% of the operating impulse discharge voltage of the equalizing ring at the bushing end to ground under standard meteorological conditions is as follows:
[0022] U 50％套管 =K·U 50％棒板
[0023] Among them, U 50％套管U is the 50% operating impulse discharge voltage of the equalizing ring at the bushing end to ground under standard meteorological conditions. 50％棒板 The operating impulse discharge voltage is 50% of the bar-plate gap under standard meteorological conditions.
[0024] in:
[0025]
[0026] Where K is the equalizing ring gap coefficient, D1 is the ring diameter in meters, and D2 is the pipe diameter in meters.
[0027] Furthermore, this invention also proposes a bushing external insulation gap distance calculation system based on the gap coefficient method, comprising:
[0028] The calculation unit is used to determine the operating shock withstand voltage of the high-altitude casing, calculate the 50% operating shock discharge voltage based on the operating shock withstand voltage, and correct the 50% operating shock discharge voltage to obtain the discharge voltage required under standard meteorological conditions.
[0029] The modeling unit is used to determine the calculation formula for the 50% operating impulse discharge voltage of the equalizing ring to the ground under standard meteorological conditions, based on the calculation formula of the 50% operating impulse discharge voltage of the rod-plate gap under standard meteorological conditions and the relationship between the equalizing ring gap coefficient and the ring diameter and pipe diameter.
[0030] The solution unit is used to calculate the gap distance of the outer insulation of the bushing at high altitude by setting the required discharge voltage under standard meteorological conditions to be equal to 50% of the operating impulse discharge voltage of the equalizing ring at the bushing end to ground.
[0031] Optionally, the calculation formula for the 50% discharge voltage of the operational impulse is derived based on the operational impulse withstand voltage, as follows:
[0032]
[0033] Among them, U 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
[0034] Optionally, the formula for calculating the correction factor for correcting the 50% discharge voltage of the operational impact is as follows:
[0035]
[0036] Where, k a Here, H is the altitude of the installation site, and m is the correction factor.
[0037] Optionally, the correction formula for correcting the 50% discharge voltage of the operational impact is as follows:
[0038]
[0039] Among them, U 50％0 k is the discharge voltage required under standard meteorological conditions. a Here, H is the altitude of the installation site, m is the correction factor, and U is the correction factor. 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
[0040] Optionally, the formula for calculating 50% of the operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions is as follows:
[0041] U 50％棒板 =500d 0.6
[0042] Among them, U 50％棒板 The voltage is 50% of the operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions, and d is the gap distance.
[0043] Optionally, the calculation formula for 50% of the operating impulse discharge voltage of the equalizing ring at the bushing end to ground under standard meteorological conditions is as follows:
[0044] U 50％套管 =K·U 50％棒板
[0045] Among them, U 50％套管 U is the 50% operating impulse discharge voltage of the equalizing ring at the bushing end to ground under standard meteorological conditions. 50％棒板 The operating impulse discharge voltage is 50% of the rod-plate gap of the high-altitude bushing under standard meteorological conditions.
[0046] in:
[0047]
[0048] Where K is the equalizing ring gap coefficient, D1 is the ring diameter in meters, and D2 is the pipe diameter in meters.
[0049] In another aspect, the present invention also provides a computing device, comprising: one or more processors;
[0050] A processor is used to execute one or more programs;
[0051] When the one or more programs are executed by the one or more processors, the method described above is implemented.
[0052] In another aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the method described above.
[0053] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0054] This invention provides a method for calculating the external insulation gap distance of bushings based on the gap coefficient method, comprising: determining the operating impulse withstand voltage of the high-altitude bushing; calculating the 50% operating impulse discharge voltage based on the operating impulse withstand voltage; correcting the 50% operating impulse discharge voltage to obtain the discharge voltage required under standard meteorological conditions; determining the calculation formula for the 50% operating impulse discharge voltage of the bushing end equalizing ring to ground under standard meteorological conditions based on the calculation formula for the 50% operating impulse discharge voltage of the bushing end equalizing ring to ground under standard meteorological conditions; setting the discharge voltage required under standard meteorological conditions equal to the 50% operating impulse discharge voltage of the bushing end equalizing ring to ground; and calculating the gap distance of the external insulation of the high-altitude bushing based on the discharge voltage required under standard meteorological conditions and the calculation formula for the 50% operating impulse discharge voltage of the bushing end equalizing ring to ground. This invention makes the calculation of the external insulation gap distance of bushings more convenient and faster, which can save a lot of economic costs and time. Attached Figure Description
[0055] Figure 1 This is a flowchart of the method of the present invention;
[0056] Figure 2 This is a flowchart of an embodiment of the method of the present invention;
[0057] Figure 3 This is a structural diagram of the system of the present invention. Detailed Implementation
[0058] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.
[0059] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.
[0060] Example 1:
[0061] This invention proposes a method for calculating the external insulation gap distance of bushings based on the gap coefficient method, such as... Figure 1 As shown, it includes:
[0062] Step 1: Determine the operating impact withstand voltage of the high-altitude casing, calculate the 50% operating impact discharge voltage based on the operating impact withstand voltage, and correct the 50% operating impact discharge voltage to obtain the discharge voltage required under standard meteorological conditions.
[0063] Step 2: Based on the calculation formula of 50% operating impulse discharge voltage of the rod-plate gap under standard meteorological conditions and the relationship between the equalizing ring gap coefficient and the ring diameter and pipe diameter, determine the calculation formula of 50% operating impulse discharge voltage of the equalizing ring at the end of the bushing to the ground under standard meteorological conditions.
[0064] Step 3: Set the required discharge voltage under standard weather conditions to 50% of the operating impulse discharge voltage of the bushing end equalizing ring to ground. Based on the calculation formula of the required discharge voltage under standard weather conditions and the 50% operating impulse discharge voltage of the bushing end equalizing ring to ground, calculate the gap distance of the outer insulation of the bushing at high altitude.
[0065] The calculation formula for the 50% discharge voltage of the operational impulse, based on the operational impulse withstand voltage, is as follows:
[0066]
[0067] Among them, U 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
[0068] The formula for calculating the correction factor for correcting the 50% discharge voltage of the operational impact is as follows:
[0069]
[0070] Where, k a Here, H is the altitude of the installation site, and m is the correction factor.
[0071] The correction formula for adjusting the 50% discharge voltage during the operation is as follows:
[0072]
[0073] Among them, U 50％0 k is the discharge voltage required under standard meteorological conditions. aHere, H is the altitude of the installation site, m is the correction factor, and U is the correction factor. 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
[0074] The formula for calculating the 50% operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions is as follows:
[0075] U 50％棒板 =500d 0.6
[0076] Among them, U 50％棒板 The voltage is 50% of the operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions, and d is the gap distance.
[0077] The calculation formula for the 50% operational impulse discharge voltage of the equalizing ring at the end of the bushing to ground under standard meteorological conditions is as follows:
[0078] U 50％套管 =K·U 50％棒板
[0079] Among them, U 50％套管 U is the 50% operating impulse discharge voltage of the equalizing ring at the bushing end to ground under standard meteorological conditions. 50％棒板 The operating impulse discharge voltage is 50% of the rod-plate gap of the high-altitude bushing under standard meteorological conditions.
[0080] in:
[0081]
[0082] Where K is the equalizing ring gap coefficient, D1 is the ring diameter in meters, and D2 is the pipe diameter in meters.
[0083] The invention will be further illustrated below with specific examples:
[0084] Specific case process, such as Figure 2 As shown, it includes:
[0085] Based on the insulation withstand level specified in the project and relevant standards, determine the operating impulse withstand voltage U of the bushing. wc Calculate the 50% discharge voltage U of the operational impact. 50％ .
[0086]
[0087] In the formula, σ is the coefficient of variation of the operating impulse discharge voltage, which is taken as 0.06.
[0088] For high-altitude projects, the U-shaped requirements of high-altitude projects will be considered.50％ Multiply by the altitude correction factor k a Obtain the required discharge voltage value U under standard meteorological conditions. 50％0 .
[0089]
[0090] In the formula, H is the altitude of the installation site, in meters; m is a correction factor, the value of which is specified in Appendix 1. Figure 2 Selected from the options.
[0091] but:
[0092]
[0093] The 50% operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions is:
[0094] U 50％棒板 =500d 0.6
[0095] Based on extensive test data from the China Electric Power Research Institute regarding the ground-to-ground impulse discharge of equalizing rings, the relationship between the equalizing ring gap coefficient K and its ring diameter D1 (m) and pipe diameter D2 (m) can be obtained as follows:
[0096]
[0097] The 50% operational impulse discharge voltage of the equalizing ring at the bushing end relative to ground is:
[0098]
[0099] Let U 50％0 =U 50％套管 The calculated gap distance d is the required bushing outer insulation gap distance.
[0100] For example, a 1000kV AC transformer bushing with an equalizing ring of 1.5m diameter and 0.3m diameter is used at an altitude of 4300m.
[0101] The operating impact insulation withstand level U of the bushing required by the project wc Given a voltage of 1950kV, the calculated 50% discharge voltage U 50％ The calculation formula is as follows:
[0102]
[0103] Withstand voltage 1950kV, combined with attached Figure 2 The correction factor m is chosen to be 0.371. The altitude correction factor k is calculated. a The calculation formula is as follows:
[0104]
[0105] 50% discharge voltage U converted to standard meteorological conditions 50％0 for:
[0106] U 50％0 =k a U 50％ =2697 (kV)
[0107] If the equipotential ring has a diameter of 2.7m and the pipe diameter is 0.34m, then under standard meteorological conditions, the clearance coefficient between the equipotential ring and the ground at the end of the casing is:
[0108]
[0109] Therefore, the 50% operational impulse discharge voltage of the equalizing ring at the bushing end relative to ground is:
[0110] U 50％套管 =K·U 50％棒板 =K·500d 0.6 =600d 0.6
[0111] According to U 50％0 =U 50％套管 The bushing is used to calculate d = 12.24m. The gap distance d is the required external insulation gap distance of the bushing.
[0112] Based on extensive experimental data, this invention proposes a design method for bushing external insulation gap distance by combining the gap coefficient method and altitude correction. Compared to existing bushing external insulation gap distance design methods, the proposed method is more convenient and faster in calculating the bushing external insulation gap distance, which can save significant economic costs and time.
[0113] Example 2:
[0114] Furthermore, this invention also proposes a bushing external insulation gap distance calculation system 200 based on the gap coefficient method, such as... Figure 3 As shown, it includes:
[0115] The calculation unit 201 is used to determine the operating shock withstand voltage of the high-altitude casing, calculate the 50% operating shock discharge voltage based on the operating shock withstand voltage, and correct the 50% operating shock discharge voltage to obtain the discharge voltage required under standard meteorological conditions.
[0116] Modeling unit 202 is used to determine the calculation formula for the 50% operating impulse discharge voltage of the rod-plate gap of the high-altitude casing under standard meteorological conditions, and the relationship between the equalizing ring gap coefficient and the ring diameter and pipe diameter, and to determine the calculation formula for the 50% operating impulse discharge voltage of the equalizing ring at the end of the casing to the ground under standard meteorological conditions.
[0117] Solver 203 is used to determine the gap distance of the outer insulation of the bushing at high altitude by setting the required discharge voltage under standard meteorological conditions to be equal to 50% of the operating impulse discharge voltage of the equalizing ring at the bushing end to the ground. Based on the calculation formula of the required discharge voltage under standard meteorological conditions and 50% of the operating impulse discharge voltage of the equalizing ring at the bushing end to the ground, the gap distance of the bushing is determined.
[0118] The calculation formula for the 50% discharge voltage of the operational impulse, based on the operational impulse withstand voltage, is as follows:
[0119]
[0120] Among them, U 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
[0121] The formula for calculating the correction factor for correcting the 50% discharge voltage of the operational impact is as follows:
[0122]
[0123] Where, k a Here, H is the altitude of the installation site, and m is the correction factor.
[0124] The correction formula for adjusting the 50% discharge voltage during the operation is as follows:
[0125]
[0126] Among them, U 50％0 k is the discharge voltage required under standard meteorological conditions. a Here, H is the altitude of the installation site, m is the correction factor, and U is the correction factor. 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
[0127] The formula for calculating the 50% operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions is as follows:
[0128] U 50％棒板 =500d 0.6
[0129] Among them, U 50％棒板 The voltage is 50% of the operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions, and d is the gap distance.
[0130] The calculation formula for the 50% operational impulse discharge voltage of the equalizing ring at the end of the bushing to ground under standard meteorological conditions is as follows:
[0131] U 50％套管 =K·U 50％棒板
[0132] Among them, U 50％套管 U is the 50% operating impulse discharge voltage of the equalizing ring at the bushing end to ground under standard meteorological conditions. 50％棒板 The operating impulse discharge voltage is 50% of the rod-plate gap of the high-altitude bushing under standard meteorological conditions.
[0133] in:
[0134]
[0135] Where K is the equalizing ring gap coefficient, D1 is the ring diameter in meters, and D2 is the pipe diameter in meters.
[0136] This invention makes it more convenient and faster to calculate the distance of the outer insulation gap of the bushing, which can save a lot of economic costs and time.
[0137] Example 3:
[0138] Based on the same inventive concept, this invention also provides a computer device, which includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement corresponding method flows or corresponding functions, thereby implementing the steps of the methods in the above embodiments.
[0139] Example 4:
[0140] Based on the same inventive concept, this invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiments.
[0141] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.
[0142] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0143] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0144] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0145] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.
[0146] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.
Claims
1. A method for calculating the external insulation gap distance of a bushing based on the gap coefficient method, characterized in that, include: The operating impulse withstand voltage of the high-altitude casing is determined, and the 50% operating impulse discharge voltage is calculated based on the operating impulse withstand voltage. The 50% operating impulse discharge voltage is then corrected to obtain the discharge voltage required under standard meteorological conditions. Based on the calculation formula of 50% operating impulse discharge voltage of the rod-plate gap under standard meteorological conditions and the relationship between the equalizing ring gap coefficient and the ring diameter and pipe diameter, the calculation formula of 50% operating impulse discharge voltage of the equalizing ring at the end of the bushing to the ground under standard meteorological conditions is determined. Let the required discharge voltage under standard meteorological conditions be equal to 50% of the operating impulse discharge voltage of the bushing end equalizing ring to ground. Based on the calculation formula of the required discharge voltage under standard meteorological conditions and 50% of the operating impulse discharge voltage of the bushing end equalizing ring to ground, the gap distance of the outer insulation of the bushing at high altitude is obtained.
2. The method according to claim 1, characterized in that, The calculation formula for the 50% discharge voltage of the operational impulse, based on the aforementioned operational impulse withstand voltage, is as follows: Among them, U 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
3. The method according to claim 1, characterized in that, The formula for calculating the correction factor to correct for the 50% discharge voltage of the operational impact is as follows: Where, k a Here, H is the altitude of the installation site, and m is the correction factor.
4. The method according to claim 1, characterized in that, The correction formula for adjusting the 50% discharge voltage of the operational impulse is as follows: Among them, U 50％0 k is the discharge voltage required under standard meteorological conditions. a Here, H is the altitude of the installation site, m is the correction factor, and U is the correction factor. 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
5. The method according to claim 1, characterized in that, The formula for calculating the 50% operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions is as follows: U 50％棒板 =500d 0.6 Among them, U 50％棒板 The voltage is 50% of the operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions, and d is the gap distance.
6. The method according to claim 1, characterized in that, The formula for calculating the 50% operational impulse discharge voltage of the equalizing ring at the bushing end to ground under standard meteorological conditions is as follows: IN 50％套管 =K·U 50％棒板 Among them, U 50％套管 U is the 50% operating impulse discharge voltage of the equalizing ring at the bushing end to ground under standard meteorological conditions. 50％棒板 The operating impulse discharge voltage is 50% of the bar-plate gap under standard meteorological conditions. in: Where K is the equalizing ring gap coefficient, D1 is the ring diameter in meters, and D2 is the pipe diameter in meters.
7. A method for calculating the external insulation gap distance of a bushing based on the gap coefficient method, characterized in that, include: The calculation unit is used to determine the operating shock withstand voltage of the high-altitude casing, calculate the 50% operating shock discharge voltage based on the operating shock withstand voltage, and correct the 50% operating shock discharge voltage to obtain the discharge voltage required under standard meteorological conditions. The modeling unit is used to determine the calculation formula for the 50% operating impulse discharge voltage of the equalizing ring to the ground under standard meteorological conditions, based on the calculation formula of the 50% operating impulse discharge voltage of the rod-plate gap under standard meteorological conditions and the relationship between the equalizing ring gap coefficient and the ring diameter and pipe diameter. The solution unit is used to set the required discharge voltage under standard weather conditions to be equal to 50% of the operating impulse discharge voltage of the bushing end equalizing ring to ground under standard weather conditions. Based on the calculation formula of the required discharge voltage under standard weather conditions and 50% of the operating impulse discharge voltage of the bushing end equalizing ring to ground under standard weather conditions, the gap distance of the outer insulation of the bushing at high altitude is calculated.
8. The system according to claim 7, characterized in that, The calculation formula for the 50% discharge voltage of the operational impulse, based on the aforementioned operational impulse withstand voltage, is as follows: Among them, U 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
9. The system according to claim 7, characterized in that, The formula for calculating the correction factor to correct for the 50% discharge voltage of the operational impact is as follows: Where, k a Here, H is the altitude of the installation site, and m is the correction factor.
10. The system according to claim 7, characterized in that, The correction formula for adjusting the 50% discharge voltage of the operational impulse is as follows: Among them, U 50％0 k is the discharge voltage required under standard meteorological conditions. a Here, H is the altitude of the installation site, m is the correction factor, and U is the correction factor. 50％ To operate at 50% discharge voltage, U wc σ represents the operating impulse withstand voltage of the high-altitude bushing, and σ is the coefficient of variation of the operating impulse discharge voltage.
11. The system according to claim 7, characterized in that, The formula for calculating the 50% operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions is as follows: U 50％棒板 =500d 0.6 Among them, U 50％棒板 The voltage is 50% of the operating impulse discharge voltage of the bar-plate gap under standard meteorological conditions, and d is the gap distance.
12. The system according to claim 7, characterized in that, The formula for calculating the 50% operational impulse discharge voltage of the equalizing ring at the bushing end to ground under standard meteorological conditions is as follows: IN 50％套管 =K·U 50％棒板 Among them, U 50％套管 U is the 50% operating impulse discharge voltage of the equalizing ring at the bushing end to ground under standard meteorological conditions. 50％棒板 The operating impulse discharge voltage is 50% of the bar-plate gap under standard meteorological conditions. in: Where K is the equalizing ring gap coefficient, D1 is the ring diameter in meters, and D2 is the pipe diameter in meters.
13. A computer device, characterized in that, include: One or more processors; A processor is used to execute one or more programs; When the one or more programs are executed by the one or more processors, the method described in any one of claims 1-6 is implemented.
14. A computer-readable storage medium, characterized in that, It contains a computer program, which, when executed, implements the method as described in any one of claims 1-6.