High-voltage transformer substation fixing fitting anti-corona device and design method thereof

Abstract

The invention discloses a high-voltage transformer substation fixing fitting anti-corona device and a design method thereof. The design method of an anti-corona ring comprises the steps that the type of a fitting and the voltage grade of a power transmission system where the fitting is located are obtained; according to the corona onset electric field intensity of the fitting, a maximum electric field intensity threshold value allowed to be borne by the fitting is set; constructing an optimization formula by taking optimization of the maximum electric field intensity borne by the surface of the hardware fitting as a target, and optimizing the structural parameters of the anti-corona ring in combination with the type and the voltage grade of the hardware fitting; according to the structural parameters of the anti-corona ring, establishing a simulation model of the anti-corona ring, simulating the electric field distribution of the installation of the anti-corona ring, and extracting the maximum electric field intensity of the surface of the hardware fitting; a verification result is obtained by judging the maximum electric field intensity and the maximum electric field intensity threshold value and verifying the structure parameters, and if the verification result shows that verification is passed, the optimal structure parameters are output, so that electric field distribution on the surface of the hardware fitting is effectively regulated and controlled through the anti-corona ring, and corona discharge is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission and transformation engineering, and in particular to an anti-corona device for fixing hardware of a high-voltage substation and a design method thereof. Background Art

[0002] As high-voltage transmission networks continue to expand, substation fixtures, as essential components of transmission lines, have become increasingly important. Their electrical performance directly impacts the safe and stable operation of the entire transmission system. The complex geometric shapes of fixture surfaces can easily lead to electric field concentration, especially under high voltage conditions, causing partial discharge and even corona effects. Corona not only causes energy loss but also electromagnetic interference, equipment surface corrosion, insulation degradation, and even fixture failure, seriously threatening the safety and reliability of power grid operations.

[0003] Currently, research on anti-corona measures for insulator strings, transmission line terminals, and other locations is relatively mature, such as the use of grading rings and anti-corona shields. However, there is less research on the electric field control of substation fixtures. In practical applications, the problem of local electric field concentration in fixtures is often overlooked, making fixtures the weakest link in the system most prone to corona. Traditional improvement methods mainly reduce the electric field intensity by optimizing the geometric shape of the fixtures and increasing the radius of curvature. However, this method is complex in design, has high manufacturing costs, and cannot balance mechanical strength and installation adaptability, limiting its promotion and application in existing engineering systems. Summary of the Invention

[0004] The present invention provides an anti-corona device for high-voltage transformer substation fixtures and a design method thereof, which are used to solve the problem of corona generation in the fixtures due to local electric field concentration in the fixtures.

[0005] The present invention provides a design method for an anti-corona ring for a high-voltage substation fixing hardware, comprising:

[0006] Obtaining the type of the fixture and the voltage level of the power transmission system in which the fixture is located;

[0007] According to the corona initiation electric field strength of the fixing hardware, a threshold value of the maximum electric field strength that the fixing hardware is allowed to withstand is set;

[0008] With the goal of optimizing the maximum electric field strength that the surface of the fixture can withstand, an optimization formula is constructed, and the structural parameters of the anti-corona ring are optimized in combination with the type of the fixture and the voltage level;

[0009] According to the structural optimization parameters of the anti-corona ring, a simulation model of the anti-corona ring is established to simulate the electric field distribution when the anti-corona ring is installed, and the maximum electric field intensity on the surface of the fixing hardware is extracted;

[0010] Verifying the structural parameters by determining the difference between the maximum electric field strength and the maximum electric field strength threshold, obtaining a verification result, and outputting the optimal structural parameters if the verification result indicates that the verification is passed;

[0011] The final production size of the anti-corona ring and its installation position on the surface of the fixing hardware are determined based on the optimal structural parameters.

[0012] Furthermore, the structural parameters of the anti-corona ring include the inner diameter of the anti-corona ring, the tube diameter, and the distance from the fixing hardware. The optimization formula includes: performing mathematical modeling based on the relationship between the structural parameters of the anti-corona ring and the maximum electric field strength on the surface of the fixing hardware, and obtaining the optimization design formula as follows:

[0013] ;

[0014] Among them, E max is the maximum electric field strength that the surface of the hardware can withstand, Y1, Y2, Y3, and Y4 are fitting constants determined according to the hardware type and the voltage level, A is the tube diameter of the anti-corona ring, D is the inner diameter of the anti-corona ring, and S is the distance between the anti-corona ring and the hardware.

[0015] Furthermore, the maximum electric field strength E of the surface of the fixing hardware is determined. max ' and the maximum electric field strength threshold E' that the fixing hardware can withstand max The size of the structure parameters is verified, including: if E max ′≥E′ max , the verification result is that the verification fails, and the optimization of the structural parameters of the anti-corona ring is repeated; if E max '<E' max , then the verification result is verification passed.

[0016] Furthermore, Y2, Y3, and Y4 are all less than 0, and the repeatedly performing the optimization of the structural parameters of the anti-corona ring includes:

[0017] Increase the tube diameter A of the anti-corona ring and / or increase the inner diameter D of the anti-corona ring and / or reduce the installation distance S between the anti-corona ring and the hardware.

[0018] Furthermore, priority is given to increasing the tube diameter A of the anti-corona ring and / or the inner diameter D of the anti-corona ring, and then considering reducing the installation distance S between the anti-corona ring and the hardware.

[0019] The present invention also provides an anti-corona device for high-voltage substation fixing hardware, characterized in that it includes a connecting piece and an anti-corona ring obtained by adopting any of the design methods described above, the anti-corona ring is arranged on a surface close to the fixing hardware, the center of the anti-corona ring is arranged on a conductor passing through the fixing hardware, one end of the connecting piece is connected to the inner side of the anti-corona ring, and the other end of the connecting piece is used to connect to the conductor, and the anti-corona ring is made of conductive material.

[0020] Furthermore, the anti-corona device includes a single anti-corona ring, which is arranged on one side of the fixing hardware; or the anti-corona device includes multiple anti-corona rings, which are arranged in parallel and respectively located on opposite sides of the fixing hardware.

[0021] Furthermore, the anti-corona ring is a hollow annular structure.

[0022] Furthermore, the anti-corona ring is made of a material that is both conductive and corrosion-resistant.

[0023] Furthermore, the surface of the anti-corona ring is coated with anti-pollution flashover material.

[0024] It can be seen from the above technical solutions that the present invention has the following advantages:

[0025] The embodiment of the present invention constructs an optimization formula based on the type of hardware and the voltage level of the transmission system in which the fixed hardware is located to quickly obtain the structural parameters of the anti-corona ring, establishes a simulation model of the anti-corona ring to verify the combination of structural parameters, outputs the optimal structural parameters, and determines the final production size of the anti-corona ring and its installation position on the surface of the fixed hardware based on the optimal structural parameters. The anti-corona ring can effectively regulate the electric field distribution on the surface of the fixed hardware to avoid corona discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A flowchart of the steps of a design method for an anti-corona ring for a high-voltage substation fixture provided by an embodiment of the present invention;

[0028] Figure 2 A schematic structural diagram of an anti-corona device for high-voltage substation fixtures provided by an embodiment of the present invention;

[0029] Figure 3A schematic structural diagram of a fixing hardware a provided in an embodiment of the present invention;

[0030] Figure 4 A schematic structural diagram of a fixing hardware b provided in an embodiment of the present invention;

[0031] Figure 5 A schematic structural diagram of a fixing hardware c provided in an embodiment of the present invention;

[0032] Figure 6 Schematic diagram of the assembly of an anti-corona device and a conductor of a fixing fixture c provided in an embodiment of the present invention (single-ring installation);

[0033] Figure 7 Schematic diagram of the assembly of an anti-corona device and a conductor of a fixing fixture c provided in an embodiment of the present invention (multi-ring installation);

[0034] Description of reference numerals:

[0035] 1. Anti-corona device; 10. Inner ring; 11. Anti-corona ring; 12. Spoke; 2. Fixing hardware; 21. Fixing hardware a; 22. Fixing hardware b; 23. Fixing hardware c; 3. Conductor. DETAILED DESCRIPTION

[0036] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] The terms "first," "second," "third," "fourth," and so forth (if any) in the description and drawings of the present invention are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that, for example, the implementation of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product, or apparatus.

[0038] like Figure 1 As shown, the embodiment of the present application provides a design method for an anti-corona ring for a high-voltage substation fixing hardware, comprising:

[0039] S01. Obtain the type of the fixture 2 and the voltage level of the power transmission system where the fixture 2 is located;

[0040] S02: according to the corona initiation electric field strength of the fixture 2, set the maximum electric field strength threshold E′ that the fixture 2 is allowed to withstand. max ;

[0041] S03, to optimize the maximum electric field strength E that the surface of the fixing hardware 2 can withstand max As a goal, an optimization formula is constructed, and the structural parameters of the anti-corona ring 11 are optimized in combination with the type of the fixing hardware 2 and the voltage level;

[0042] S04, according to the structural optimization parameters of the anti-corona ring 11, establish a simulation model of the anti-corona ring 11, simulate the electric field distribution of the anti-corona ring 11 installation, and extract the maximum electric field intensity E on the surface of the fixing hardware 2 max ';

[0043] S05. Verifying the structural parameters by determining the difference between the maximum electric field strength and the maximum electric field strength threshold, obtaining a verification result, and outputting the optimal structural parameters if the verification result indicates that the verification is passed;

[0044] S06. Determine the final manufacturing dimensions of the anti-corona ring 11 and its installation position on the surface of the fixing hardware 2 according to the optimal structural parameters.

[0045] It can be understood that during specific implementation, this embodiment constructs an optimization formula to quickly obtain the structural parameters of the anti-corona ring 11 based on the type of hardware and the voltage level of the transmission system in which the fixing hardware 2 is located, establishes a simulation model of the anti-corona ring 11 to verify the combination of structural parameters, outputs the optimal structural parameters, and determines the final production size of the anti-corona ring 11 and its installation position on the surface of the fixing hardware 2 based on the optimal structural parameters. The anti-corona ring 11 can effectively regulate the electric field distribution on the surface of the fixing hardware 2 to avoid corona discharge.

[0046] In a more specific embodiment, the fixing hardware 2 is applied to a DC or AC substation, such as Figure 3-Figure 5As shown in the figure, there are three types of fixtures: fixture a21, fixture b22, and fixture c23. Fixture a21 represents an MDG single busbar fixture, fixture b22 represents an MSG double flexible busbar fixture, and fixture c23 represents an MGG tubular busbar fixture. These three fixture types represent, to a certain extent, the different characteristics of substation fixtures. MDG single busbar fixtures have a compact structure and moderate electric field concentration; MSG double flexible busbar fixtures have a more complex electric field distribution due to their multiple connection points; and MGG tubular busbar fixtures have a relatively uniform surface and low electric field concentration.

[0047] In a more specific embodiment, the voltage level includes 330 kV to 1100 kV.

[0048] In a more specific embodiment, step S02 further includes: setting a maximum electric field strength threshold E′ that the fixture 2 is allowed to withstand according to national or industry standards. max , which is not higher than the corona initiation electric field intensity of the fixing hardware 2.

[0049] In a more specific embodiment, in step S04, a simulation model of the anti-corona ring 11 is established, and the method for simulating the electric field distribution of the anti-corona ring 11 is: a three-dimensional model is established based on finite element software to simulate the electric field distribution of the anti-corona device 1 under standard working conditions.

[0050] In a more specific embodiment, step S06 also includes: finalization and engineering drawing: determining the final parameter combination, forming standard drawings and assembly specifications, and ensuring the manufacturability of the structure and the convenience of on-site construction.

[0051] In a more specific embodiment, the structural parameters of the anti-corona ring 11 include the inner diameter of the anti-corona ring 11, the tube diameter and the distance from the fixing hardware 2. The construction of the optimization design formula includes: mathematical modeling based on the relationship between the structural parameters of the anti-corona ring 11 and the maximum electric field intensity on the surface of the fixing hardware 2, and the optimization design formula is obtained as follows:

[0052] ;

[0053] Among them, E max is the maximum electric field strength that the surface of the hardware can withstand, Y1, Y2, Y3, and Y4 are fitting constants determined according to the hardware type and the voltage level, A is the tube diameter of the anti-corona ring 11, D is the inner diameter of the anti-corona ring 11, and S is the distance between the anti-corona ring 11 and the hardware.

[0054] It is understood that, in order to further improve the design efficiency of the anti-corona device 1 and reduce the large number of parameter calculations and iterations during the finite element simulation process, the present invention proposes an empirical fitting design method for structural parameters based on the regularity analysis of simulation data. This method uses regression formulas to model the relationship between the main geometric parameters of the anti-corona ring 11 and the maximum electric field intensity on the surface of the fixing hardware 2, thereby simplifying and standardizing the design process.

[0055] Based on the finite element simulation analysis results, the following three sets of one-dimensional empirical fitting formulas are constructed to quickly estimate the maximum electric field intensity on the surface of the fixture 2, E max (Unit: kV / cm).

[0056]

[0057] Among them, H1, H2, H3, H4, H5, and H6 are constants obtained by fitting according to the type of fixture 2 and the rated voltage.

[0058] In order to consider the influence of multiple variables in the design, a set of comprehensive joint fitting formulas are further derived:

[0059] ;

[0060] Among them, E max is the maximum electric field strength that the surface of the hardware can withstand, E max <E′ max , Y1, Y2, Y3, and Y4 are fitting constants determined according to the hardware type and the voltage level, A is the tube diameter of the anti-corona ring 11, D is the inner diameter of the anti-corona ring 11, and S is the distance between the anti-corona ring 11 and the hardware.

[0061] Therefore, by constructing an optimization design formula through a regression formula, the parameters can be input in real time to directly calculate the electric field strength, and the combination of structural parameters of the anti-corona device 1 can be obtained, thereby simplifying and standardizing the design process, reducing the large number of parameter trial calculations and iterations in the finite element simulation process, and further improving the design efficiency of the anti-corona device 1.

[0062] In this embodiment, according to the actual project, the geometric dimensions (including outer diameter, length, minimum curvature radius, etc.) of the target fixture 2 and the operating voltage level (330kV to 1100kV) are determined, and then the values ​​of Y1, Y2, Y3, and Y4 are determined.

[0063] This embodiment divides the working conditions into three different hardware types and voltage levels, performs finite element simulations on each working condition, and uses the multivariate linear regression method to determine the values ​​of the fitting constants Y1, Y2, Y3, and Y4 under each working condition, which are used for subsequent rapid matching and calling of different scenarios:

[0064] Table 1 Values ​​of fitting constants Y1, Y2, Y3, and Y4

[0065]

[0066] The above data were obtained through a large number of finite element simulations and experimental verification. The error between the electric field strength of the fixture 2 determined by this simulation method and the measured maximum electric field strength was controlled within ±5%.

[0067] In a more specific embodiment, the maximum electric field strength E on the surface of the fixing hardware 2 is determined. max ' and the maximum electric field strength threshold E' that the fixing hardware can withstand max The size of the structure parameters is verified, including: if E max ′≥E′ max , the verification result is that the verification fails, and the optimization of the structural parameters of the anti-corona ring 11 is repeated; if E max '<E' max , then the verification result is verification passed.

[0068] It is understandable that, in specific implementation, by iteratively optimizing the structural parameters of the anti-corona device 1 to ensure that the maximum electric field intensity borne by the surface of the hardware is lower than the maximum electric field intensity threshold, the maximum electric field intensity borne by the surface of the hardware can be effectively reduced to suppress corona discharge.

[0069] In a more specific embodiment, Y2, Y3, and Y4 are all less than 0, and the repeatedly performing the optimization of the structural parameters of the anti-corona ring 11 includes:

[0070] Increase the tube diameter A of the anti-corona ring 11 and / or increase the inner diameter D of the anti-corona ring 11 and / or reduce the installation distance S between the anti-corona ring 11 and the hardware.

[0071] It can be understood that, in a specific implementation, by setting Y2, Y3, and Y4 to constants all less than 0, the electric field control principle is satisfied: when A and D increase, the local electric field concentration can be effectively alleviated, and the electric field transition is uniform; and when S decreases, the maximum electric field intensity on the surface of the fixing hardware 2 is reduced.

[0072] This embodiment optimizes the electric field around the hardware by adjusting the diameter A of the anti-corona ring 11, the inner diameter D of the anti-corona ring 11, and the installation distance S between the anti-corona ring 11 and the hardware. This has the following advantages:

[0073] (1) The diameter A of the anti-corona ring 11 is increased, which is equivalent to increasing its cross-sectional size, and can adjust the shape of the equipotential surface in a larger range, which can effectively alleviate the local electric field concentration;

[0074] (2) The inner diameter D of the anti-corona ring 11 is increased, which can expand the electric field action area, improve the electric field distribution around the fixing hardware 2, and facilitate uniform transition of the electric field;

[0075] (3) The installation distance S between the anti-corona ring 11 and the hardware can enhance the coupling effect of the anti-corona ring 11 on the local high electric field strength area on the surface of the fixing hardware 2 and reduce the maximum electric field strength on the surface of the fixing hardware 2.

[0076] In a more specific embodiment, priority is given to increasing the tube diameter A of the anti-corona ring 11 and / or the inner diameter D of the anti-corona ring 11 , and then considering reducing the installation distance S between the anti-corona ring 11 and the hardware.

[0077] It is understandable that, in specific implementation, by giving priority to adjusting A and D, it is possible to achieve optimized suppression of the electric field intensity on the surface of the hardware with higher efficiency and feasibility within a limited structural space. The reason for this adjustment strategy is that the effect of adjusting the installation distance S between the anti-corona ring 11 and the hardware on the electric field is increased. The diameter A of the anti-corona ring 11 or the inner diameter D of the anti-corona ring 11 has a nonlinear weakening characteristic. When the installation distance S between the anti-corona ring 11 and the hardware is small, the electric field suppression effect of reducing the installation distance S between the anti-corona ring 11 and the hardware is limited, and is often restricted by the actual on-site layout. For cases where the electric field distribution is severely uneven, a multi-ring series structure can be used to optimize the overall effect.

[0078] In a more specific embodiment, the parameter optimization process further includes:

[0079] (1) Multi-objective trade-off strategy: Under the premise of ensuring that the electrical performance meets the standards, the structural strength, material cost and manufacturing process of the anti-corona ring 11 are optimized, taking into account both lightweight design and long-term operation and maintenance stability;

[0080] (2) Modular configuration scheme: When there are multiple specifications of fixtures 2 in the same substation, parameter adaptive selection can be performed based on the geometric feature library of the fixture 2, and a unified interface structure can be used for batch integration and replacement.

[0081] The embodiment of the present invention provides an anti-corona device 1 for fixing hardware 2 of a high-voltage substation, such as Figure 2 As shown, it includes a connector and an anti-corona ring 11 obtained by the design method of any of the above embodiments, the anti-corona ring 11 is arranged on the surface close to the fixing hardware 2, the center of the anti-corona ring 11 is arranged on the conductor 3 passing through the fixing hardware 2, one end of the connector is connected to the inner side of the anti-corona ring 11, and the other end of the connector is used to connect to the conductor 3, and the anti-corona ring 11 is made of conductive material.

[0082] It can be understood that, in a specific implementation, by setting the anti-corona device 1 on the surface of the fixed hardware 2, based on the structural smoothness and conductivity of the anti-corona ring 11, the electric field on the surface of the fixed hardware 2 can be effectively optimized. Specifically: the anti-corona ring is a good conductor. When it is in the electric field on the surface of the hardware, the free electrons inside it will move under the action of the electric field force until they reach an electrostatic equilibrium state. At this time, the surface of the conductive ring becomes an equipotential surface, that is, the electric potential of each point on the surface of the conductive ring is equal. Since the electric field lines are always perpendicular to the equipotential surface, the originally uneven electric field lines will be "combed" and become more uniform, thereby improving the electric field distribution on the surface of the hardware, reducing the maximum field strength, and making it difficult to generate corona.

[0083] In a more specific embodiment, the connecting member includes an inner ring 10 and a plurality of spokes 12. The inner ring 10 is coaxially arranged with the anti-corona ring 11. The inner ring 10 is located on the inner side of the anti-corona ring 11. One end of the spoke 12 is connected to the outer side of the inner ring 10, and the other end of the spoke 12 is connected to the outer side of the anti-corona ring 11.

[0084] In a more specific embodiment, the connector further includes a clamp, and the anti-corona ring 11 and the conductor 3 are fixed via the clamp, which facilitates installation, disassembly and replacement.

[0085] It is understandable that, in specific implementation, the anti-corona device 1 of this embodiment includes a connector and an anti-corona ring 11 . The connector and the anti-corona ring 11 are modularly designed, and have a simple structure and are easy to install and maintain.

[0086] In a more specific embodiment, the anti-corona device 1 includes a single anti-corona ring 11, which is arranged on one side of the fixing hardware 2; or the anti-corona device 1 includes multiple anti-corona rings 11, which are arranged in parallel and respectively located on opposite sides of the fixing hardware 2.

[0087] It is understandable that, in specific implementation, the anti-corona ring 11 can be installed in series as a single ring or multiple rings, such as Figure 6 and Figure 7 As shown, it can adapt to the changing requirements of different fixing hardware types or voltage levels and improve the situation of serious uneven electric field distribution. The specific installation method can be determined by the following table:

[0088] Table 2 Installation instructions

[0089]

[0090] It should be noted that when the hardware is large and the voltage level is 500kV, the hardware is large in size, the surface curvature changes greatly, the electric field is more likely to concentrate, and it is difficult to achieve electric field regulation with a single ring. Anti-corona rings 11 can be set on the bus conductors 3 on both sides of the hardware surface. For the side with large curvature changes, multiple anti-corona rings 11 can be set in parallel and at intervals to improve the optimization ability of the electric field on the hardware surface. The size design and installation design of each anti-corona ring 11 are designed according to the above design method.

[0091] In a more specific embodiment, the anti-corona ring 11 is a hollow annular structure.

[0092] It can be understood that, in specific implementation, on the one hand, the hollow structure is equivalent to the surrounding conductor 3 shells, forming a good electric field shielding area and weakening the local electric field peak; on the other hand, by reducing the weight, the mechanical burden of supporting components such as hardware is reduced.

[0093] In a more specific embodiment, the anti-corona ring 11 is made of a material that is both conductive and corrosion-resistant.

[0094] It is understandable that, in specific implementation, it is ensured that the anti-corona ring 11 has both good electrical performance and corrosion resistance.

[0095] In a more specific embodiment, the anti-corona ring 11 is made of aluminum or stainless steel.

[0096] In a more specific embodiment, the surface of the anti-corona ring 11 is coated with anti-pollution flashover material.

[0097] It is understandable that, in specific implementation, the surface structure of the anti-corona ring 11 is environmentally enhanced according to different layout scenarios (indoor, outdoor, high pollution, high altitude, etc.), by adding an insulating coating or applying a hydrophobic film layer to prevent pollution flashover.

[0098] In a more specific embodiment, in order to verify the environmental adaptability and engineering practicality of the present invention, a 450 kV peak AC substation is selected in this embodiment, the MDG single busbar fixing fixture 2 is selected as the fixing fixture 2 model, and the maximum allowable electric field strength threshold is set to 30 kV / cm.

[0099] The structural parameters of the anti-corona ring 11 designed by the method of the present invention are: the tube diameter A of the anti-corona ring 11 is 60 mm, the inner diameter D of the anti-corona ring 11 is 140 mm, and the installation distance S between the anti-corona ring 11 and the hardware is 200 mm.

[0100] A systematic verification was conducted through a combination of finite element simulation and field measurements. Under this anti-corona ring parameter combination of 11, the simulation results and the field measured values ​​were 22.1 kV / cm and 22.4 kV / cm, respectively, with a relative error of -1.34%.

[0101] Further testing under 42 operating conditions, covering voltage levels from 330kV to 1100kV and three types of fixtures, demonstrated that the average absolute error between the simulated and actual electric field strengths was less than 2kV / cm, with a maximum relative error within 5%. This accuracy was also maintained in scenarios involving multiple series-connected rings and insulation coatings. These validation data fully demonstrate that the formula can efficiently and reliably guide the design of anti-corona rings, significantly reducing electric field strength to below the safety threshold, demonstrating excellent environmental adaptability and engineering practicality.

[0102] Table 3 Test data of 42 working conditions of anti-corona ring

[0103]

[0104] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A design method for an anti-corona ring for a high-voltage substation fixture, characterized in that: include: Obtaining the type of the fixture and the voltage level of the power transmission system in which the fixture is located; According to the corona initiation electric field strength of the fixing hardware, a threshold value of the maximum electric field strength that the fixing hardware is allowed to withstand is set; With the goal of optimizing the maximum electric field strength that the surface of the fixture can withstand, an optimization formula is constructed, and the structural parameters of the anti-corona ring are optimized in combination with the type of the fixture and the voltage level; According to the structural parameters of the anti-corona ring, a simulation model of the anti-corona ring is established to simulate the electric field distribution when the anti-corona ring is installed, and the maximum electric field intensity on the surface of the fixing hardware is extracted; Verifying the structural parameters by determining the difference between the maximum electric field intensity on the surface of the fixing hardware and the maximum electric field intensity threshold, obtaining a verification result, and outputting the optimal structural parameters if the verification result indicates that the verification is passed; The final production size of the anti-corona ring and its installation position on the surface of the fixing hardware are determined based on the optimal structural parameters.

2. The design method of an anti-corona ring for a high-voltage substation fixture according to claim 1, characterized in that: The structural parameters of the anti-corona ring include the inner diameter of the anti-corona ring, the tube diameter, and the distance from the fixing hardware. The optimization formula includes: mathematical modeling based on the structural parameters of the anti-corona ring and the maximum electric field strength borne by the surface of the fixing hardware, and the optimization design formula is obtained as follows: ； Among them, E max is the maximum electric field strength that the surface of the fixing hardware can withstand, Y1, Y2, Y3, and Y4 are fitting constants determined according to the type of the fixing hardware and the voltage level, A is the tube diameter of the anti-corona ring, D is the inner diameter of the anti-corona ring, and S is the distance between the anti-corona ring and the fixing hardware.

3. The design method of an anti-corona ring for a high-voltage substation fixture according to claim 2, characterized in that: By judging the maximum electric field strength E on the surface of the fixing hardware max ' and the maximum electric field strength threshold E' that the fixing hardware can withstand max The size of the structure parameters is verified, including: if E max ′≥E′ max , the verification result is that the verification fails, and the optimization of the structural parameters of the anti-corona ring is repeated; if E max '<E' max , then the verification result is verification passed.

4. The design method of an anti-corona ring for a high-voltage substation fixture according to claim 3 is characterized in that: Y2, Y3, and Y4 are all less than 0, and the repeatedly performing the optimization of the structural parameters of the anti-corona ring includes: Increase the tube diameter A of the anti-corona ring and / or increase the inner diameter D of the anti-corona ring and / or reduce the installation distance S between the anti-corona ring and the fixing hardware.

5. The design method of an anti-corona ring for a high-voltage substation fixture according to claim 4, characterized in that: Priority should be given to increasing the tube diameter A of the anti-corona ring and / or the inner diameter D of the anti-corona ring, and then considering reducing the installation distance S between the anti-corona ring and the fixing hardware.

6. An anti-corona device for fixing hardware of a high-voltage substation, characterized in that: It includes a connecting piece and an anti-corona ring obtained by the design method according to any one of claims 1 to 5, wherein the anti-corona ring is arranged on a surface close to the fixing hardware, the center of the anti-corona ring is arranged on a conductor passing through the fixing hardware, one end of the connecting piece is connected to the inner side of the anti-corona ring, and the other end of the connecting piece is used to connect to the conductor, and the anti-corona ring is made of conductive material.

7. The anti-corona device for high-voltage substation fixtures according to claim 6, characterized in that: The anti-corona device includes a single anti-corona ring, which is arranged on one side of the fixing hardware; or the anti-corona device includes multiple anti-corona rings, which are arranged in parallel and respectively located on opposite sides of the fixing hardware.

8. The anti-corona device for high-voltage substation fixtures according to claim 7, characterized in that: The anti-corona ring is a hollow annular structure.

9. The anti-corona device for high-voltage substation fixtures according to claim 8, characterized in that: The anti-corona ring is made of a material that is both conductive and corrosion-resistant.

10. The anti-corona device for high-voltage substation fixtures according to claim 9, characterized in that: The surface of the anti-corona ring is coated with anti-pollution flashover material.

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