Sleeve external insulation gap distance calculation method and system considering capacitor core body influence

Abstract

The invention discloses a bushing external insulation gap distance calculation method and system considering the influence of a capacitor core body. The method comprises the following steps: determining 50% discharge voltage of a bushing based on bushing external insulation operation impact withstand voltage; based on the 50% discharge voltage of the bushing, determining 50% operation impulse discharge voltage of the individual grading ring to the ground; based on the ground operation impact discharge characteristic curve of the grading ring at different gap distances under the preset altitude, obtaining the ground operation impact discharge characteristic curve of the grading ring at different gap distances under different altitude conditions; and determining the external insulation gap distance of the sleeve at the target altitude based on the grounding operation impulse discharge characteristic curve of the grading ring at the target altitude and the 50% operation impulse discharge voltage of the single grading ring to the ground. According to the method, the external insulation gap distance of the sleeve at the target altitude can be accurately determined, the external insulation length of the sleeve is effectively reduced, the manufacturing cost is saved, the production and manufacturing difficulty is reduced, and meanwhile the design difficulty of a valve hall is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage gap discharge, and more particularly, to a bushing outer insulation gap distance calculation method and system considering the influence of a capacitive core. BACKGROUND

[0002] In recent years, the power industry in China has developed rapidly, and extra-high voltage projects have been widely used. However, the corresponding increase in voltage level means an increase in the requirement for insulation level, so the design level of equipment insulation under extra-high voltage has become a research hotspot in this field at home and abroad, and the outer insulation design of the bushing is one of them.

[0003] Bushing design is a weak area of China's extra-high voltage technology, which greatly restricts the process of localization and thus affects the application in engineering. With the existing traditional bushing outer insulation length design method based on the discharge voltage of a single grading ring-ground, the length of the bushing is easily made longer and longer with the increase of voltage level and altitude. In some high-altitude extra-high voltage projects, the designed length of the bushing even exceeds the production limit of the bushing manufacturer, which brings great trouble to the manufacture of equipment in actual engineering.

[0004] The above problems show that the design of the bushing outer insulation length is a problem that needs to be solved in the actual extra-high voltage project at present. However, as a relatively complex electrical equipment, the bushing inner insulation structure has a certain influence on the electric field distribution of the air end, and a small amount of experiments have shown that the bushing core has an influence on the air gap discharge voltage.

[0005] Therefore, from this point of view, it is necessary to propose a new bushing outer insulation gap distance calculation method considering the influence of the capacitive core. SUMMARY

[0006] The present application proposes a bushing outer insulation gap distance calculation method and system considering the influence of the capacitive core to solve the problem of how to accurately realize the bushing outer insulation gap distance calculation considering the influence of the capacitive core.

[0007] In order to solve the above problems, according to one aspect of the present application, a bushing outer insulation gap distance calculation method considering the influence of the capacitive core is provided, which comprises:

[0008] determining the 50% discharge voltage of the bushing based on the bushing outer insulation switching impulse withstand voltage;

[0009] determining the 50% switching impulse discharge voltage of a single grading ring-ground based on the 50% discharge voltage of the bushing;

[0010] The operating impulse discharge characteristic curve of the grading ring to ground at different gap distances at a preset altitude is obtained.

[0011] The gap distance of the outer insulation of the bushing at the target altitude is determined based on the operating impulse discharge characteristic curve of the grading ring to ground at the target altitude and the 50% operating impulse discharge voltage of the grading ring to ground alone.

[0012] Preferably, the 50% discharge voltage of the bushing is determined based on the operating impulse withstand voltage of the outer insulation of the bushing, comprising:

[0013]

[0014] wherein U 50％套管 is the 50% discharge voltage of the bushing; U wc is the operating impulse withstand voltage of the outer insulation of the bushing; and σ is the coefficient of variation of the operating impulse discharge voltage.

[0015] Preferably, the 50% operating impulse discharge voltage of the grading ring to ground alone is determined based on the 50% discharge voltage of the bushing, comprising:

[0016]

[0017] τ=2.297·x 2.349 +0.8689·y -0.07 ,

[0018] wherein U 50％均压环 is the 50% operating impulse discharge voltage of the grading ring to ground alone; U 50％套管 is the 50% discharge voltage of the bushing; and τ is a proportional parameter; x is the upper shielding ratio; and y is the lower shielding ratio.

[0019] Preferably, the operating impulse discharge characteristic curve of the grading ring to ground at different gap distances at different altitudes is obtained based on the operating impulse discharge characteristic curve of the grading ring to ground at different gap distances at a preset altitude, comprising:

[0020] According to the operating impulse discharge characteristic curves of the grading ring to ground at different gap distances at 0m altitude and 4300m altitude, the operating impulse discharge characteristic curves of the grading ring to ground at different gap distances at different altitudes are obtained by interpolation based on the principle that the electrical strength of insulation decreases by the same percentage for every 100m increase in altitude.

[0021] Preferably, the gap distance of the outer insulation of the bushing at the target altitude is determined based on the operating impulse discharge characteristic curve of the grading ring to ground at the target altitude and the 50% operating impulse discharge voltage of the grading ring to ground alone, comprising:

[0022] solving f(L) = U 50％均压环 to obtain the bushing external insulation gap distance at the target altitude; wherein U 50％均压环 is the 50% operating impulse discharge voltage of the single grading ring to ground; f(L) is the grading ring to ground discharge characteristic curve at the target altitude; and L is the bushing external insulation gap distance.

[0023] According to another aspect of the present application, there is provided a bushing external insulation gap distance calculation system considering the influence of the capacitor core, comprising:

[0024] a first voltage calculation unit configured to determine the 50% discharge voltage of the bushing based on the bushing external insulation operating impulse withstand voltage;

[0025] a second voltage calculation unit configured to determine the 50% operating impulse discharge voltage of the single grading ring to ground based on the 50% discharge voltage of the bushing;

[0026] a discharge characteristic curve acquisition unit configured to acquire the grading ring to ground operating impulse discharge characteristic curve at different gap distances under different altitude conditions based on the grading ring to ground operating impulse discharge characteristic curve at different gap distances under a preset altitude;

[0027] a gap distance determination unit configured to determine the bushing external insulation gap distance at the target altitude based on the grading ring to ground operating impulse discharge characteristic curve at the target altitude and the 50% operating impulse discharge voltage of the single grading ring to ground.

[0028] Preferably, wherein the first voltage calculation unit, based on the bushing external insulation operating impulse withstand voltage to determine the 50% discharge voltage of the bushing, comprises:

[0029]

[0030] wherein U 50％套管 is the 50% discharge voltage of the bushing; U wc is the bushing external insulation operating impulse withstand voltage; and σ is the coefficient of variation of the operating impulse discharge voltage.

[0031] Preferably, wherein the second voltage calculation unit, based on the 50% discharge voltage of the bushing to determine the 50% operating impulse discharge voltage of the single grading ring to ground, comprises:

[0032]

[0033] τ = 2.297 · x 2.349 + 0.8689 · y -0.07 ,

[0034] wherein U 50％均压环50% operating impulse discharge voltage of the single grading ring to ground; U 50％套管 50% discharge voltage of the bushing; τ is a proportional parameter; x is the upper shield proportion; y is the lower shield proportion.

[0035] Preferably, the discharge characteristic curve acquisition unit acquires the grading ring-to-ground operating impulse discharge characteristic curve at different gap distances under different altitudes based on the grading ring-to-ground operating impulse discharge characteristic curve at different gap distances under a preset altitude, and the method comprises the following steps of:

[0036] According to the grading ring-to-ground operating impulse discharge characteristic curve at different gap distances under 0 m altitude and 4300 m altitude, the grading ring-to-ground operating impulse discharge characteristic curve at different gap distances under different altitudes is acquired by using an interpolation method based on the principle that the electrical strength of insulation decreases by the same percentage for every 100 m increase in altitude.

[0037] Preferably, the gap distance determination unit determines the bushing external insulation gap distance under the target altitude based on the grading ring-to-ground operating impulse discharge characteristic curve under the target altitude and the 50% operating impulse discharge voltage of the single grading ring to ground, and the method comprises the following steps of:

[0038] Solving f(L) = U 50％均压环 to acquire the bushing external insulation gap distance under the target altitude; wherein, U 50％均压环 is the 50% operating impulse discharge voltage of the single grading ring to ground; f(L) is the grading ring-to-ground discharge characteristic curve under the target altitude; and L is the bushing external insulation gap distance.

[0039] Based on another aspect of the present application, the present application provides a computer readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the steps of any one of the bushing external insulation gap distance calculation methods considering the influence of the capacitor core.

[0040] Based on another aspect of the present application, the present application provides an electronic device comprising:

[0041] The computer readable storage medium described above; and

[0042] One or more processors for executing the program in the computer readable storage medium.

[0043] The application provides a bushing external insulation gap distance method and system considering the influence of a capacitor core, which comprises the following steps: determining the 50% discharge voltage of a bushing based on the bushing external insulation switching impulse withstand voltage; determining the 50% switching impulse discharge voltage of a single grading ring to ground based on the 50% discharge voltage of the bushing; obtaining the switching impulse discharge characteristic curve of the grading ring to ground under different gap distances at different altitudes based on the switching impulse discharge characteristic curve of the grading ring to ground under different gap distances at a preset altitude; and determining the bushing external insulation gap distance at a target altitude based on the switching impulse discharge characteristic curve of the grading ring to ground at the target altitude and the 50% switching impulse discharge voltage of the single grading ring to ground. The application can accurately determine the bushing external insulation gap distance at the target altitude, effectively reduces the external insulation length of the bushing, saves the manufacturing cost, reduces the manufacturing difficulty, and effectively reduces the design difficulty of the valve hall. BRIEF DESCRIPTION OF DRAWINGS

[0044] The exemplary embodiments of the application can be more completely understood in reference to the following drawings:

[0045] Figure 1 The flow chart of the bushing external insulation gap distance calculation method 100 considering the influence of the capacitor core according to the embodiments of the application;

[0046] Figure 2 The overall flow chart of the bushing external insulation gap distance calculation method considering the influence of the capacitor core according to the embodiments of the application;

[0047] Figure 3 The schematic diagram of the upper and lower shields according to the embodiments of the application;

[0048] Figure 4 The schematic diagram of the switching impulse discharge characteristic curve of the grading ring to ground under different gap distances at different altitudes according to the embodiments of the application;

[0049] Figure 5 The schematic diagram of determining the gap distance according to the embodiments of the application;

[0050] Figure 6 The structural schematic diagram of the bushing external insulation gap distance calculation system 600 considering the influence of the capacitor core according to the embodiments of the application. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] Figure 1 This is a flowchart of a bushing external insulation gap distance calculation method 100 considering the influence of the capacitor core according to an embodiment of the present invention. Figure 1 As shown, the bushing external insulation gap distance calculation method considering the influence of the capacitor core provided by the embodiments of the present invention can accurately determine the bushing external insulation gap distance at the target altitude, effectively reducing the external insulation length of the bushing, saving manufacturing costs, reducing production difficulty, and also effectively reducing the design difficulty of the valve hall. The bushing external insulation gap distance calculation method 100 considering the influence of the capacitor core provided by the embodiments of the present invention starts from step 101. In step 101, the 50% discharge voltage of the bushing is determined based on the operating impulse withstand voltage of the bushing external insulation.

[0054] Preferably, determining the 50% discharge voltage of the bushing based on the operating impulse withstand voltage of the bushing external insulation includes:

[0055]

[0056] Among them, U 50％套管 The discharge voltage is 50% of the bushing voltage; U wc σ is the operating impulse withstand voltage of the bushing external insulation; σ is the coefficient of variation of the operating impulse discharge voltage.

[0057] In step 102, the 50% operating impulse discharge voltage of the individual equalizing ring to ground is determined based on the 50% discharge voltage of the bushing.

[0058] Preferably, determining the 50% operating impulse discharge voltage of the individual equalizing ring to ground based on the 50% discharge voltage of the bushing includes:

[0059]

[0060] τ=2.297·x2.349 + 0.8689 · y -0.07 ,

[0061] wherein U 50％均压环 is the 50% operating impulse discharge voltage of the single grading ring to ground; U 50％套管 is the 50% discharge voltage of the bushing; τ is a proportional parameter; x is the upper shielding ratio; and y is the lower shielding ratio.

[0062] At step 103, the operating impulse discharge characteristic curve of the grading ring to ground at different gap distances under different altitude conditions is obtained based on the operating impulse discharge characteristic curve of the grading ring to ground at different gap distances under a preset altitude.

[0063] Preferably, wherein the operating impulse discharge characteristic curve of the grading ring to ground at different gap distances under different altitude conditions is obtained based on the operating impulse discharge characteristic curve of the grading ring to ground at different gap distances under a preset altitude, comprising:

[0064] According to the operating impulse discharge characteristic curve of the grading ring to ground at different gap distances under 0m altitude and 4300m altitude, the operating impulse discharge characteristic curve of the grading ring to ground at different gap distances under different altitude conditions is obtained based on the principle that "the electrical strength of insulation decreases by the same percentage for every 100m increase in altitude" by using the interpolation method.

[0065] At step 104, the bushing external insulation gap distance under the target altitude is determined based on the operating impulse discharge characteristic curve of the grading ring to ground under the target altitude and the 50% operating impulse discharge voltage of the single grading ring to ground.

[0066] Preferably, wherein the bushing external insulation gap distance under the target altitude is determined based on the operating impulse discharge characteristic curve of the grading ring to ground under the target altitude and the 50% operating impulse discharge voltage of the single grading ring to ground, comprising:

[0067] solving f(L) = U 50％均压环 to obtain the bushing external insulation gap distance under the target altitude; wherein U 50％均压环 is the 50% operating impulse discharge voltage of the single grading ring to ground; f(L) is the discharge characteristic curve of the grading ring to ground under the target altitude; and L is the bushing external insulation gap distance.

[0068] In the past, the research on external insulation design often designs the air clearance according to the discharge characteristic of the grading ring to ground at the end of the bushing, without considering the influence of the bushing body on the external insulation. Therefore, the present application proposes a bushing external insulation gap distance design method considering the influence of the capacitor core, which can guide the design of the external insulation of the ultra-high voltage bushing, thereby reducing the manufacturing difficulty and engineering design difficulty of the bushing.

[0069] In combination withFigure 2 As shown, in this invention, the required operating impulse withstand voltage U of the bushing's external insulation is first determined based on the insulation withstand level specified for the bushing in the engineering specifications and relevant standards. wc The required 50% discharge voltage U is obtained through withstand voltage calculation. 50％套管 ,include: In the formula, σ is the coefficient of variation of the operating impulse discharge voltage, which is taken as 0.06.

[0070] Then, considering the discharge voltage U at the air end when the bushing is on. 50％套管 It is higher than the ground discharge voltage U of a simple equalizing ring. 50％均压环 Furthermore, the values ​​of the two can be considered to be in a certain proportion. Here, a proportionality parameter τ is defined, τ = U. 50％套管 / U 50％均压环 τ is a value obtained from actual experimental data, and is related to the ratio of upper and lower shielding in the insulation structure inside the bushing. The upper shielding ratio is the distance from the top of the capacitor screen 1 to the bottom of the equalizing ring / the dry arc distance; the lower shielding ratio at the air end is the distance from the last screen of the capacitor screen to the top of the flange / the dry arc distance, as detailed below. Figure 3 As shown. Let the upper shielding ratio be x and the lower shielding ratio be y. From the experimental results, we get: τ = 2.297·x 2.349 +0.8689·y -0.07 Therefore, the required 50% operating impulse discharge voltage U of the individual equalizing ring to ground can be calculated. 50％均压环 for:

[0071] Then, based on the existing ground-operated impulse discharge characteristic curves of the equalizing ring at different gap distances at altitudes of 0m and 4300m, the discharge curves at different gap distances under different altitude conditions were obtained using interpolation, as shown in the attached figure. Figure 4 As shown. The principle of the interpolation method is that "for every 100m increase in altitude, the electrical strength of the insulation decreases by the same percentage".

[0072] Finally, based on the target altitude of the actual engineering bushing, the ground discharge characteristic curve f(L) of the equalizing ring at that target altitude is selected, and f(L) = U 50％均压环 The required gap distance L can be obtained by solving this problem. The principle for determining the gap distance L is as follows: Figure 5 As shown.

[0073] The application is based on test conclusions that the discharge voltage of the air end with a sleeve is higher than the discharge voltage of the simple grading ring to the ground, and a new sleeve outer insulation gap distance design method considering the influence of the sleeve inner insulation capacitor core on the design of the sleeve outer insulation length is proposed. Compared with the original sleeve outer insulation gap distance design method, the newly proposed method effectively reduces the outer insulation length of the sleeve, saves the manufacturing cost, reduces the production and manufacturing difficulty, and also effectively reduces the design difficulty of the valve hall.

[0074] The following specific examples illustrate the embodiments of the application

[0075] In the embodiments of the application, taking the ±800kV DC engineering sleeve under the condition of an altitude of 4000m as an example, the process of determining the gap distance includes:

[0076] 1. The 50% discharge voltage U of the sleeve is determined based on the operating impulse withstand level U of the sleeve required by the engineering wc is 1600kV, and the calculated 50% discharge voltage U 50％ is:

[0077] 2. For the sleeve with 25% upper shielding and 10% lower shielding, the proportionality coefficient τ is: τ = 2.297·x 2.349 + 0.8689·y -0.07 = 1.11, and the required 50% operating impulse discharge voltage U of the single grading ring to the ground is: 50％均压环

[0078] 3. According to the existing operating impulse discharge characteristic curves of the grading ring to the ground under the conditions of 0m altitude and 4300m altitude, the interpolation method can be used to obtain the discharge curve under different altitude conditions.

[0079] 4. Select the grading ring to the ground discharge characteristic curve f(L) under the condition of 4000m altitude, and let f(L) = U 50％均压环 = 1638kV, and the obtained L is the sleeve outer insulation gap distance.

[0080] Figure 6 is a structural schematic diagram of a sleeve outer insulation gap distance calculation system 600 according to the embodiments of the application considering the influence of the capacitor core. As Figure 6 shown, the sleeve outer insulation gap distance calculation system 600 considering the influence of the capacitor core provided by the embodiments of the application includes: a first voltage calculation unit 601, a second voltage calculation unit 602, a discharge characteristic curve acquisition unit 603, and a gap distance determination unit 604.

[0081] Preferably, the first voltage calculation unit 601 is configured to determine the 50% discharge voltage of the sleeve based on the sleeve outer insulation operating impulse withstand voltage. ​

[0082] Preferably, the first voltage calculation unit 601 determines the 50% discharge voltage of the bushing based on the operating impulse withstand voltage of the bushing external insulation, including:

[0083]

[0084] Among them, U 50％套管 The discharge voltage is 50% of the bushing voltage; U wc σ is the operating impulse withstand voltage of the bushing external insulation; σ is the coefficient of variation of the operating impulse discharge voltage.

[0085] Preferably, the second voltage calculation unit 602 is used to determine the 50% operating impulse discharge voltage of the individual equalizing ring to ground based on the 50% discharge voltage of the bushing.

[0086] Preferably, the second voltage calculation unit 602 determines the 50% operating impulse discharge voltage of the individual equalizing ring to ground based on the 50% discharge voltage of the bushing, including:

[0087]

[0088] τ=2.297·x 2.349 +0.8689·y -0.07 ,

[0089] Among them, U 50％均压环 This is 50% of the operating impulse discharge voltage of the individual equalizing ring to ground; U 50％套管 τ is the 50% discharge voltage of the bushing; x is the proportion of the upper shield; y is the proportion of the lower shield.

[0090] Preferably, the discharge characteristic curve acquisition unit 603 is used to acquire the ground operation impact discharge characteristic curve of the equalizing ring at different altitudes and different gap distances based on the ground operation impact discharge characteristic curve of the equalizing ring at different gap distances at preset altitudes.

[0091] Preferably, the discharge characteristic curve acquisition unit 603 acquires the ground operation impact discharge characteristic curves of the equalizing ring at different altitudes and different gap distances based on the ground operation impact discharge characteristic curves of the equalizing ring at different gap distances at preset altitudes, including:

[0092] Based on the ground operation impulse discharge characteristic curves of the equalizing ring at different gap distances at altitudes of 0m and 4300m, the interpolation method was used to obtain the ground operation impulse discharge characteristic curves of the equalizing ring at different gap distances under different altitude conditions, based on the principle that "for every 100m increase in altitude, the electrical strength of the insulation decreases by the same percentage".

[0093] Preferably, the gap distance determining unit 604 is used to determine the bushing outer insulation gap distance at the target altitude based on the operating impulse discharge characteristic curve of the equalizing ring to ground at the target altitude and the 50% operating impulse discharge voltage of the equalizing ring to ground alone.

[0094] Preferably, the gap distance determining unit 604 determines the bushing outer insulation gap distance at the target altitude based on the operating impulse discharge characteristic curve of the equalizing ring to ground at the target altitude and the 50% operating impulse discharge voltage of the individual equalizing ring to ground, including:

[0095] Solve for f(L) = U 50％均压环 To obtain the bushing external insulation gap distance at the target altitude; where U 50％均压环 50% of the operating impulse discharge voltage of the equalizing ring to ground; f(L) is the discharge characteristic curve of the equalizing ring to ground at the target altitude; L is the distance of the bushing outer insulation gap.

[0096] The bushing external insulation gap distance calculation system 600 considering the influence of the capacitor core in an embodiment of the present invention corresponds to the bushing external insulation gap distance calculation method 100 considering the influence of the capacitor core in another embodiment of the present invention, and will not be described again here.

[0097] Based on another aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the steps in a method for calculating the bushing external insulation gap distance considering the influence of the capacitor core.

[0098] According to another aspect of the present invention, the present invention provides an electronic device, comprising:

[0099] The aforementioned computer-readable storage medium; and

[0100] One or more processors for executing a program in the computer-readable storage medium.

[0101] The present invention has been described with reference to a few embodiments. However, it will be apparent to those skilled in the art that other embodiments besides those disclosed above fall equivalently within the scope of the present invention.

[0102] Generally, all terms used in this invention are interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

[0103] 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 embodied 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for calculating the bushing external insulation gap distance considering the influence of the capacitor core, characterized in that, The method includes: The 50% discharge voltage of the bushing is determined based on the operating impulse withstand voltage of the bushing's external insulation. The 50% operating impulse discharge voltage of the individual equalizing ring to ground is determined based on the 50% discharge voltage of the bushing. Based on the ground operation impulse discharge characteristic curves of the equalizing ring at different gap distances at preset altitudes, the ground operation impulse discharge characteristic curves of the equalizing ring at different gap distances under different altitude conditions were obtained. Based on the operating impulse discharge characteristic curve of the equalizing ring to ground at the target altitude and the 50% operating impulse discharge voltage of the equalizing ring to ground alone, the bushing external insulation gap distance at the target altitude is determined.

2. The method according to claim 1, characterized in that, The 50% discharge voltage of the bushing is determined based on the operating impulse withstand voltage of the bushing external insulation, including: Among them, U 50％套管 The discharge voltage is 50% of the bushing voltage; U wc σ is the operating impulse withstand voltage of the bushing external insulation; σ is the coefficient of variation of the operating impulse discharge voltage.

3. The method according to claim 1, characterized in that, The 50% operating impulse discharge voltage of the individual equalizing ring to ground is determined based on the 50% discharge voltage of the bushing, including: τ=2.297·x 2.349 +0.8689·y -0.07 , Among them, U 50％均压环 This is 50% of the operating impulse discharge voltage of the individual equalizing ring to ground; U 50％套管 τ is the 50% discharge voltage of the bushing; x is the proportion of the upper shield; y is the proportion of the lower shield.

4. The method according to claim 1, characterized in that, Based on the ground operation impulse discharge characteristic curves of the equalizing ring at different gap distances at preset altitudes, the ground operation impulse discharge characteristic curves of the equalizing ring at different gap distances under different altitude conditions were obtained, including: Based on the ground operation impulse discharge characteristic curves of the equalizing ring at different gap distances at altitudes of 0m and 4300m, the interpolation method was used to obtain the ground operation impulse discharge characteristic curves of the equalizing ring at different gap distances under different altitude conditions, based on the principle that "for every 100m increase in altitude, the electrical strength of the insulation decreases by the same percentage".

5. The method according to claim 1, characterized in that, Based on the operating impulse discharge characteristic curve of the equalizing ring to ground at the target altitude and the 50% operating impulse discharge voltage of the equalizing ring to ground alone, the bushing external insulation gap distance at the target altitude is determined, including: Solve for f(L) = U 50％均压环 To obtain the bushing external insulation gap distance at the target altitude; where U 50％均压环 50% of the operating impulse discharge voltage of the equalizing ring to ground; f(L) is the discharge characteristic curve of the equalizing ring to ground at the target altitude; L is the distance of the bushing outer insulation gap.

6. A bushing external insulation gap distance calculation system considering the influence of capacitor core, characterized in that, The system includes: The first voltage calculation unit is used to determine the 50% discharge voltage of the bushing based on the operating impulse withstand voltage of the bushing external insulation. The second voltage calculation unit is used to determine the 50% operating impulse discharge voltage of the individual equalizing ring to ground based on the 50% discharge voltage of the bushing. The discharge characteristic curve acquisition unit is used to acquire the ground operation impulse discharge characteristic curves of the equalizing ring at different altitudes and different gap distances based on the ground operation impulse discharge characteristic curves of the equalizing ring at different gap distances at preset altitudes. The gap distance determination unit is used to determine the bushing external insulation gap distance at the target altitude based on the operating impulse discharge characteristic curve of the equalizing ring to ground and the 50% operating impulse discharge voltage of the individual equalizing ring to ground.

7. The system according to claim 6, characterized in that, The first voltage calculation unit determines the 50% discharge voltage of the bushing based on the operating impulse withstand voltage of the bushing external insulation, including: Among them, U 50％套管 The discharge voltage is 50% of the bushing voltage; U wc σ is the operating impulse withstand voltage of the bushing external insulation; σ is the coefficient of variation of the operating impulse discharge voltage.

8. The system according to claim 6, characterized in that, The second voltage calculation unit determines the 50% operational impulse discharge voltage of the individual equalizing ring to ground based on the 50% discharge voltage of the bushing, including: τ=2.297·x 2.349 +0.8689·y -0.07 , Among them, U 50％均压环 This is 50% of the operating impulse discharge voltage of the individual equalizing ring to ground; U 50％套管 τ is the 50% discharge voltage of the bushing; x is the proportion of the upper shield; y is the proportion of the lower shield.

9. The system according to claim 6, characterized in that, The discharge characteristic curve acquisition unit acquires the ground operation impact discharge characteristic curves of the equalizing ring at different altitudes and different gap distances, based on the ground operation impact discharge characteristic curves of the equalizing ring at different gap distances at preset altitudes, including: Based on the ground operation impulse discharge characteristic curves of the equalizing ring at different gap distances at altitudes of 0m and 4300m, the interpolation method was used to obtain the ground operation impulse discharge characteristic curves of the equalizing ring at different gap distances under different altitude conditions, based on the principle that "for every 100m increase in altitude, the electrical strength of the insulation decreases by the same percentage".

10. The system according to claim 6, characterized in that, The gap distance determination unit determines the bushing external insulation gap distance at the target altitude based on the operating impulse discharge characteristic curve of the equalizing ring to ground and the 50% operating impulse discharge voltage of the individual equalizing ring to ground, including: Solve for f(L) = U 50％均压环 To obtain the bushing external insulation gap distance at the target altitude; where U 50％均压环 50% of the operating impulse discharge voltage of the equalizing ring to ground; f(L) is the discharge characteristic curve of the equalizing ring to ground at the target altitude; L is the distance of the bushing outer insulation gap.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 1-5.

12. An electronic device, characterized in that, include: The computer-readable storage medium as described in claim 11; as well as One or more processors for executing a program in the computer-readable storage medium.

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