Method and device for determining umbrella shape of composite insulator

Abstract

The invention discloses a method for determining umbrella shapes of composite insulators. The method comprises the following steps: acquiring structural parameters of each alternative umbrella shape; on the basis of the structure parameters, simulation models of all the umbrella shapes are constructed respectively; according to simulated rainfall conditions applied to each simulation model, a creepage distance result and a flashover voltage result corresponding to each simulation model are calculated in sequence; on the basis of the creepage distance result and the flashover voltage result, sequentially calculating a performance weighted state value of each simulation model under different simulated rainfall conditions; and determining a selection result of the umbrella shape of the composite insulator according to the detected actual rainfall condition and the performance weighted state value corresponding to each simulation model. According to the method and the device for determining the umbrella shape of the composite insulator provided by the invention, the umbrella shape of the composite insulator under the rainfall condition is determined by constructing the simulation model of each umbrella shape, applying different rainfall conditions and depending on the influence of the creepage distance and the flashover voltage, so that the performance of power transmission engineering is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid transmission lines, and in particular to a composite insulator umbrella type determination method and device. Background Art

[0002] Composite insulators are essential components in power transmission projects. Composite insulators have been widely used in high-voltage transmission systems due to their small shed gaps, light weight, high strength, good pollution resistance, and convenient operation and maintenance. They can also be used in heavily polluted areas to greatly reduce the size of high-voltage transmission towers and reduce the construction cost of transmission systems. However, in rainy environments, the hydrophobicity of the silicone rubber shed surface of composite insulators is temporarily or partially lost, and its advantages cannot be reflected. At this time, the umbrella structure will measure the electrical properties of the external insulation of the composite insulator and affect its aging process. The umbrella structure of composite insulators plays a key role in power transmission and distribution systems, but under rainfall conditions, it is easily affected by water droplet accumulation and reduced insulation performance, which may lead to failure and damage of power equipment, as well as interruption of the power system. Therefore, how to select the umbrella type of composite insulators under rainfall conditions has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0003] The present invention provides a composite insulator umbrella type determination method and device, by constructing simulation models of various umbrella types, applying different rainfall conditions, relying on the influence of creepage distance and flashover voltage, to determine the umbrella type of the composite insulator under rainfall conditions, thereby ensuring the performance of the power transmission project.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a method for determining a composite insulator type, comprising:

[0005] Obtain structural parameters of each candidate umbrella type;

[0006] Based on the structural parameters, construct simulation models of various umbrella types respectively;

[0007] According to the simulated rainfall conditions applied to each of the simulation models, the creepage distance result and the flashover voltage result corresponding to each of the simulation models are calculated in turn;

[0008] Based on the creepage distance result and the flashover voltage result, sequentially calculating the performance weighted state value of each simulation model under different simulated rainfall conditions;

[0009] The selection result of the composite insulator umbrella type is determined according to the detected actual rainfall conditions and the performance weighted state values ​​corresponding to each of the simulation models.

[0010] As one of the preferred solutions, the alternative umbrella types include at least an equal-diameter umbrella type, a large-small umbrella type, and a large-small-small-medium-small-small-large umbrella type.

[0011] As one preferred solution, the structural parameters at least include umbrella width, umbrella pitch, disk diameter and structural height.

[0012] As one of the preferred solutions, the creepage distance result of the equal-diameter umbrella type is calculated by the following formula:

[0013] D1=(n1-1)×d1

[0014] Where D1 is the creepage distance of the equal-diameter shed, d1 is the longitudinal distance between adjacent sheds, and n is the number of sheds;

[0015] The creepage distance result of the large-small umbrella type is calculated by the following formula:

[0016] D2=n2×(f1+f2+f3)

[0017] Wherein, D2 is the creepage distance of the large-small umbrella type, f1 is the endpoint distance between the large umbrella skirt at the top and the middle umbrella skirt in the middle, f2 is the longitudinal distance between the middle umbrella skirt in the middle and the large umbrella skirt at the bottom, f3 is the projection distance of the middle umbrella skirt in the middle on the large umbrella skirt at the bottom, and n2 is the number of large-small umbrellas;

[0018] The creepage distance results of the large-small-small-medium-small-small-large umbrella type are calculated using the following formula:

[0019] D3=n3×(l1+l2+l3+l4+l5+l6)

[0020] Among them, D3 is the creepage distance of the large-small-small-medium-small-small-large umbrella type, l1, l2, l3, l4, l5 and l6 are the discharge paths between adjacent umbrella skirts in the large-small-small-medium-small-small-large umbrella type respectively, and n3 is the number of large-small-small-medium-small-small-large umbrellas.

[0021] As one of the preferred solutions, the flashover voltage result is determined according to the ratio between the umbrella width and the umbrella distance.

[0022] Another embodiment of the present invention provides a composite insulator umbrella type determination device, including a processor, wherein the processor is configured to:

[0023] Obtain structural parameters of each candidate umbrella type;

[0024] Based on the structural parameters, construct simulation models of various umbrella types respectively;

[0025] According to the simulated rainfall conditions applied to each of the simulation models, the creepage distance result and the flashover voltage result corresponding to each of the simulation models are calculated in turn;

[0026] Based on the creepage distance result and the flashover voltage result, sequentially calculating the performance weighted state value of each simulation model under different simulated rainfall conditions;

[0027] The selection result of the composite insulator umbrella type is determined according to the detected actual rainfall conditions and the performance weighted state values ​​corresponding to each of the simulation models.

[0028] As one of the preferred solutions, the alternative umbrella types include at least an equal-diameter umbrella type, a large-small umbrella type, and a large-small-small-medium-small-small-large umbrella type.

[0029] As one preferred solution, the structural parameters at least include umbrella width, umbrella pitch, disk diameter and structural height.

[0030] As one of the preferred solutions, the creepage distance result of the equal-diameter umbrella type is calculated by the following formula:

[0031] D1=(n1-1)×d1

[0032] Where D1 is the creepage distance of the equal-diameter shed, d1 is the longitudinal distance between adjacent sheds, and n is the number of sheds;

[0033] The creepage distance result of the large-small umbrella type is calculated by the following formula:

[0034] D2=n2×(f1+f2+f3)

[0035] Wherein, D2 is the creepage distance of the large-small umbrella type, f1 is the endpoint distance between the large umbrella skirt at the top and the middle umbrella skirt in the middle, f2 is the longitudinal distance between the middle umbrella skirt in the middle and the large umbrella skirt at the bottom, f3 is the projection distance of the middle umbrella skirt in the middle on the large umbrella skirt at the bottom, and n2 is the number of large-small umbrellas;

[0036] The creepage distance results of the large-small-small-medium-small-small-large umbrella type are calculated using the following formula:

[0037] D3=n3×(l1+l2+l3+l4+l5+l6)

[0038] Among them, D3 is the creepage distance of the large-small-small-medium-small-small-large umbrella type, l1, l2, l3, l4, l5 and l6 are the discharge paths between adjacent umbrella skirts in the large-small-small-medium-small-small-large umbrella type respectively, and n3 is the number of large-small-small-medium-small-small-large umbrellas.

[0039] As one of the preferred solutions, the flashover voltage result is determined according to the ratio between the umbrella width and the umbrella distance.

[0040] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0041] Construct simulation models of various alternative umbrella types to facilitate the quantification of various index parameters and improve the accuracy of subsequent umbrella type determination; use creepage distance and flashover voltage as influencing factors of each umbrella type, providing accurate theoretical support for the subsequent reasonable screening of umbrella types; the entire composite insulator umbrella type determination method improves the process of composite insulator umbrella type determination under rainfall conditions, so that the power equipment in the power transmission project is difficult to be damaged under rainfall conditions, ensuring that the power system is not interrupted, and then ensuring the electrical performance of the power transmission project. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic flow chart of a method for determining the umbrella type of a composite insulator in one embodiment of the present invention;

[0043] Figure 2 This is a diagram of experimental results in a rainy state in one embodiment of the present invention;

[0044] Figure 3 is a schematic diagram of the relationship between the flashover voltage and the umbrella width at different umbrella distances in one embodiment of the present invention;

[0045] Figure 4 Schematic diagram of the relationship between the wet flashover gradient and HS / D of an insulator in one embodiment of the present invention;

[0046] Figure 5 It is a schematic diagram of the structure of three types of umbrellas in one embodiment of the present invention;

[0047] Figure 6 is a schematic diagram of wet flash distance calculation in one embodiment of the present invention;

[0048] Figure 7 The flashover field strength E of the umbrella-shaped composite insulator under heavy rainfall when vertically installed in one embodiment of the present invention is 1.eff Relationship diagram with the length of the rain-showering surface. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In the description of this application, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0051] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are only for illustrative purposes, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0053] An embodiment of the present invention provides a method for determining the type of composite insulator. For details, see Figure 1 , Figure 1 The flowchart of the composite insulator type determination method in one embodiment of the present invention is shown, including steps S1 to S5, which are specifically as follows:

[0054] S1. Obtaining structural parameters of each candidate umbrella type;

[0055] S2. Based on the structural parameters, construct simulation models of various umbrella types respectively;

[0056] S3, according to the simulated rainfall conditions applied to each of the simulation models, sequentially calculating the creepage distance result and the flashover voltage result corresponding to each of the simulation models;

[0057] S4. Based on the creepage distance result and the flashover voltage result, sequentially calculating the performance weighted state value of each simulation model under different simulated rainfall conditions;

[0058] S5. Determine the selection result of the composite insulator umbrella type according to the detected actual rainfall conditions and the performance weighted state values ​​corresponding to each of the simulation models.

[0059] It should be noted that the embodiment of the present invention calculates the quantitative results of various alternative umbrella types under different rainfall conditions through simulation, so as to facilitate the determination of umbrella types under actual conditions. During actual rainfall, it is only necessary to screen and determine the corresponding simulated rainfall conditions according to the actual rainfall conditions detected, so as to obtain the simulation model with the highest performance status score, and determine the corresponding umbrella type as the selection result.

[0060] In an embodiment of the present invention, the alternative umbrella type includes at least an equal-diameter umbrella type, a large-small umbrella type, and a large-small-small-medium-small-small-large umbrella type. Each umbrella structure has certain advantages and disadvantages. Since the insulator size of the equal-diameter umbrella type is similar, the creepage distance is relatively short. When local dirt or rain occurs, it may be easier to form a water curtain, that is, water droplets form a continuous water film on the surface of the insulator. The size difference of the large-small umbrella type structure is large, and its creepage distance is relatively long. It may not be easy to form a water curtain, because the difference in the size of the insulator will cause the water droplets to be unevenly distributed on the surface of the insulator, making it difficult to form a continuous water film. For the case of the same length of the large-small-small-medium-small-small-large umbrella type, its creepage distance may be longer. In general, the large-small umbrella type and the large-small-small-medium-small-small-large umbrella type structure may have more advantages in creepage distance than the equal-diameter umbrella structure, and may not be easy to form a continuous water curtain. In addition, in practical applications, it is necessary to consider environmental conditions and flashover voltage requirements, select other suitable umbrella-shaped composite insulators, whose designs meet the requirements of flashover voltage and wet flashover distance, optimize the selected umbrella-shaped structure, and consider adding waterproof measures or measures to enhance insulation performance, which are not specifically limited in the embodiments of the present invention.

[0061] The umbrella structure parameters include at least: umbrella width, umbrella spacing, disc diameter, structure height, etc. In addition, the rainfall conditions in the embodiments of the present invention can also be quantified into specific numerical values ​​for analysis. For example, the concept of instantaneous rain intensity is introduced, which is defined as the total amount of rainfall within 1 minute, in units of mm / min. According to the instantaneous rain intensity, the range of heavy rain is 2.68 to 5.20 mm / min, the range of heavy rain is 4.24 to 6.68 mm / min, and the range of extremely heavy rain is 6.26 to 12.38 mm / min. Heavy rainfall is usually accompanied by a shorter duration but a higher rainfall intensity. Those skilled in the art will know that in addition to the instantaneous rain intensity, the duration of rainfall should also be considered. The shorter the duration and the larger the rainfall amount, the greater the rainfall intensity may be, which will not be further elaborated in the present invention.

[0062] It should be noted in advance that the selection of composite insulator umbrella-shaped structures under heavy rainfall requires comprehensive consideration, involving design, simulation analysis, material selection, test verification, etc. Each specific situation may be different, so in actual engineering, detailed quantification and refinement are required according to specific requirements and conditions to ensure that the selected composite insulator can work stably and reliably under heavy rainfall conditions.

[0063] The embodiment of the present invention uses creepage distance and flashover voltage as the influencing factors of each umbrella type, and provides accurate theoretical support for the subsequent reasonable screening of umbrella types. Specifically, after calculating the creepage distance result and flashover voltage result of the simulation model, these two data can be weighted to obtain a performance weighted state value, which reflects the performance of the candidate umbrella type. Preferably, the weighted coefficient is determined according to the actual design requirements. For example, the coefficient can be selected as 1, then the result of the performance weighted state value is the average value of the creepage distance result and the flashover voltage result, which will not be repeated here.

[0064] The two parameters of creepage distance and flashover voltage in the embodiment of the present invention are described in detail below, and the flashover voltage is described first.

[0065] For details, see Figure 2 , Figure 2 The experimental results under the rain state are shown in the figure, the conductivity of rainwater is 0.155S / m, and the gap between air and insulating ceramic plate at 20℃ is combined. It can be seen from the experimental results that: under the same air gap, the total length of the gap is increased, and the wet flashover voltage of the series gap gradually tends from the breakdown voltage of the pure air gap to the wet ceramic plate flashover voltage. This shows that the presence of an air gap in the flashover path can increase the wet flashover voltage, but the proportion of the air gap lk in the flashover path cannot be too small.

[0066] For details, see Figure 3 , Figure 3The diagram shows the relationship between the flashover voltage and the umbrella width at different umbrella distances. Figure 3 It can be seen from the test results that the umbrella width and umbrella distance are the main factors affecting the wet surface and air gap in the flashover path; when the umbrella width ba is very small, the surface dry area is small, the proportion of the wet surface is large, and the wet flashover voltage is low; as the umbrella width ba increases, the wet flashover voltage increases accordingly; when ba>0.5da, the flashover leaves the umbrella surface and occurs in the air gap at the edge of the umbrella, and the wet flashover voltage no longer increases with the increase of ba; in addition, reducing the umbrella distance da can also increase the wet flashover voltage. Preferably, the flashover voltage result of the embodiment of the present invention is determined according to the ratio between the umbrella width and the umbrella distance. For example, under specific rain conditions, it is more suitable when ba / da≈0.5~1.

[0067] For details, see Figure 4 , Figure 4 The figure shows the relationship between the wet flashover gradient of the insulator and HS / D. In addition to the umbrella width and umbrella distance, the Figure 4 The test results show that the larger the ratio Hs / D of the structural height Hs of the suspension insulator to the disk diameter D, the smaller the wet flashover gradient (wet flashover voltage per unit length of string); when Hs / D is the same, when the iron cap diameter is smaller, the effective wet flashover path is longer and the wet flashover gradient is larger; when the lower surface ridges are denser or the ridges are higher, the dry area is larger and the wet flashover gradient is also larger.

[0068] For creepage distance, the present invention determines the possible discharge paths of composite insulators under heavy rainfall, including surface discharge of insulators and air gap discharge under rain conditions. For ease of understanding, the present invention provides an exemplary structural diagram for each umbrella type, so as to more conveniently display the calculation process. For details, please refer to Figure 5 , Figure 5 The schematic diagrams of the structures of three types of umbrellas are shown, namely, equal diameter umbrella (a), large-small umbrella (b) and large-small-small-medium-small-small-large umbrella (c). Of course, the rainfall conditions under the three types of umbrellas are different, for example, the rainfall conditions can be 45° inclined, which will not be repeated here.

[0069] For equal-diameter umbrella insulators, since the adjacent umbrella skirts are formed into a water curtain, the creepage distance of the insulator is shortened, and the calculation formula for the creepage distance along the water curtain is:

[0070] D1=(n1-1)×d1

[0071] Where D1 is the creepage distance of the equal-diameter shed, d1 is the longitudinal distance between adjacent sheds, and n is the number of sheds;

[0072] for Figure 5 For (a) in the figure, the calculation formula is D1=9d1, and the creepage distance is generally between tens of centimeters and several meters.

[0073] For large and small umbrella insulators, since the diameter of the umbrella skirt is the same and the umbrella spacing is the same, the creepage distance of the water curtain insulator that is easy to form is also shortened. The arc is composed of the arc along the water curtain, and its length is calculated as follows:

[0074] D2=n2×(f1+f2+f3)

[0075] Wherein, D2 is the creepage distance of the large-small umbrella type, f1 is the endpoint distance between the large umbrella skirt at the top and the middle umbrella skirt in the middle, f2 is the longitudinal distance between the middle umbrella skirt in the middle and the large umbrella skirt at the bottom, f3 is the projection distance of the middle umbrella skirt in the middle on the large umbrella skirt at the bottom, and n2 is the number of large-small umbrellas;

[0076] for Figure 5 For (b) in FIG. 1 , the calculation formula is D2=5×(f1+f2+f3), which is generally within the range of tens of centimeters.

[0077] For small, medium, small and large insulators, the most likely discharge paths are l1, l2, l3, l4, l5, l6, etc., and the calculation formula for their lengths is:

[0078] D3=n3×(l1+l2+l3+l4+l5+l6)

[0079] Among them, D3 is the creepage distance of the large-small-small-medium-small-small-large umbrella type, l1, l2, l3, l4, l5 and l6 are the discharge paths between adjacent umbrella skirts in the large-small-small-medium-small-small-large umbrella type respectively, and n3 is the number of large-small-small-medium-small-small-large umbrellas.

[0080] for Figure 5 As for (c) in the figure, the calculation formula is D3=2×(l1+l2+l3+l4+l5+l6), and the specific value may be between several meters and tens of meters. It should be emphasized that the values ​​calculated above are only general ranges, and the actual creepage distance may be affected by the voltage level and environmental conditions. For example, for distribution systems with lower voltage levels, the specific values ​​of the flashover voltage and wet flashover distance are required to be relatively low, and large and small umbrella insulators will be selected. For some medium voltage systems, higher flashover voltage and wet flashover distance are required, and equal diameter umbrella insulators are suitable. For systems with high voltage levels, higher flashover voltage and wet flashover distance are required, and it is suitable to choose large, small, medium, small, and large umbrella insulators. It is determined by the actual situation and will not be elaborated here.

[0081] A specific embodiment is given below. In heavy rain, considering the weather conditions when the rain direction and the water surface are at an angle of 45 degrees, the rainwater flowing down the upper edge of the vertically installed insulator will cause the air gap between the edges of the umbrella to short-circuit, which is particularly obvious. At this time, the flashover voltage will be significantly reduced. When installed vertically, the power frequency wet flashover voltage under heavy rain can be calculated according to the following empirical formula:

[0082] U=E 1.eff l1+E 2.eff l2

[0083] In the formula, E 1.eff —effective value of flashover field strength on rain-exposed surface, kV / cm;

[0084] E 2.eff — Effective value of flashover field strength in the air gap, kV / cm;

[0085] l1—length of the rain-exposed surface in the wet flash path, cm;

[0086] l2—length of the air gap portion in the wet flash path, cm.

[0087] The applicable range of l1 and l2 is 7 to 125 cm. The length of the air gap part in the wet flashover distance refers to the sum of the shortest distances of each air gap in the wet flashover path, for example Figure 6 This is a schematic diagram of wet flash distance calculation. Figure 6 In, l1=AD+A'D'+A"F, l2=EA+DA'+DA"+FG, Figure 7 The flashover field strength E of the vertically installed composite insulator with umbrella rod under heavy rainfall 1.eff Relationship diagram with the length of the rain-exposed surface, E 1.eff from Figure 7 Insertion, E 2.eff The voltage drop of the pilot discharge channel is 3kV / cm.

[0088] Another embodiment of the present invention provides a composite insulator umbrella type determination device, including a processor, wherein the processor is configured to:

[0089] Obtain structural parameters of each candidate umbrella type;

[0090] Based on the structural parameters, construct simulation models of various umbrella types respectively;

[0091] According to the simulated rainfall conditions applied to each of the simulation models, the creepage distance result and the flashover voltage result corresponding to each of the simulation models are calculated in turn;

[0092] Based on the creepage distance result and the flashover voltage result, sequentially calculating the performance weighted state value of each simulation model under different simulated rainfall conditions;

[0093] The selection result of the composite insulator umbrella type is determined according to the detected actual rainfall conditions and the performance weighted state values ​​corresponding to each of the simulation models.

[0094] Further, in the above embodiment, the alternative umbrella types include at least an equal-diameter umbrella type, a large-small umbrella type, and a large-small-small-medium-small-small-large umbrella type.

[0095] Furthermore, in the above embodiment, the structural parameters at least include umbrella width, umbrella pitch, disk diameter and structural height.

[0096] Furthermore, in the above embodiment, the creepage distance result of the equal-diameter umbrella type is calculated by the following formula:

[0097] D1=(n1-1)×d1

[0098] Where D1 is the creepage distance of the equal-diameter shed, d1 is the longitudinal distance between adjacent sheds, and n is the number of sheds;

[0099] The creepage distance result of the large-small umbrella type is calculated by the following formula:

[0100] D2=n2×(f1+f2+f3)

[0101] Wherein, D2 is the creepage distance of the large-small umbrella type, f1 is the endpoint distance between the large umbrella skirt at the top and the middle umbrella skirt in the middle, f2 is the longitudinal distance between the middle umbrella skirt in the middle and the large umbrella skirt at the bottom, f3 is the projection distance of the middle umbrella skirt in the middle on the large umbrella skirt at the bottom, and n2 is the number of large-small umbrellas;

[0102] The creepage distance results of the large-small-small-medium-small-small-large umbrella type are calculated using the following formula:

[0103] D3=n3×(l1+l2+l3+l4+l5+l6)

[0104] Among them, D3 is the creepage distance of the large-small-small-medium-small-small-large umbrella type, l1, l2, l3, l4, l5 and l6 are the discharge paths between adjacent umbrella skirts in the large-small-small-medium-small-small-large umbrella type respectively, and n3 is the number of large-small-small-medium-small-small-large umbrellas.

[0105] Further, in the above embodiment, the flashover voltage result is determined according to the ratio between the umbrella width and the umbrella distance.

[0106] The method and device for determining the umbrella type of a composite insulator provided by the embodiment of the present invention have the beneficial effects of at least one of the following:

[0107] Construct simulation models of various alternative umbrella types to facilitate the quantification of various index parameters and improve the accuracy of subsequent umbrella type determination; use creepage distance and flashover voltage as influencing factors of each umbrella type, providing accurate theoretical support for the subsequent reasonable screening of umbrella types; the entire composite insulator umbrella type determination method improves the process of composite insulator umbrella type determination under rainfall conditions, so that the power equipment in the power transmission project is difficult to be damaged under rainfall conditions, ensuring that the power system is not interrupted, and then ensuring the electrical performance of the power transmission project.

[0108] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for determining the type of composite insulator, characterized in that: include: Obtain structural parameters of each candidate umbrella type; Based on the structural parameters, construct simulation models of various umbrella types respectively; According to the simulated rainfall conditions applied to each of the simulation models, the creepage distance result and the flashover voltage result corresponding to each of the simulation models are calculated in turn; Based on the creepage distance result and the flashover voltage result, sequentially calculating the performance weighted state value of each simulation model under different simulated rainfall conditions; The selection result of the composite insulator umbrella type is determined according to the detected actual rainfall conditions and the performance weighted state values ​​corresponding to each of the simulation models.

2. The composite insulator type determination method according to claim 1, characterized in that: The alternative umbrella types at least include an equal-diameter umbrella type, a large-small umbrella type, and a large-small-small-medium-small-small-large umbrella type.

3. The composite insulator type determination method according to claim 2, characterized in that: The structural parameters at least include umbrella width, umbrella pitch, disk diameter and structural height.

4. The composite insulator type determination method according to claim 3, characterized in that: The creepage distance result of the equal diameter umbrella type is calculated by the following formula: D1=(n1-1)×d1 Where D1 is the creepage distance of the equal-diameter shed, d1 is the longitudinal distance between adjacent sheds, and n is the number of sheds; The creepage distance result of the large-small umbrella type is calculated by the following formula: D2=n2×(f1+f2+f3) Wherein, D2 is the creepage distance of the large-small umbrella type, f1 is the endpoint distance between the large umbrella skirt at the top and the middle umbrella skirt in the middle, f2 is the longitudinal distance between the middle umbrella skirt in the middle and the large umbrella skirt at the bottom, f3 is the projection distance of the middle umbrella skirt in the middle on the large umbrella skirt at the bottom, and n2 is the number of large-small umbrellas; The creepage distance results of the large-small-small-medium-small-small-large umbrella type are calculated using the following formula: D3=n3×(l1+l2+l3+l4+l5+l6) Among them, D3 is the creepage distance of the large-small-small-medium-small-small-large umbrella type, l1, l2, l3, l4, l5 and l6 are the discharge paths between adjacent umbrella skirts in the large-small-small-medium-small-small-large umbrella type respectively, and n3 is the number of large-small-small-medium-small-small-large umbrellas.

5. The composite insulator type determination method according to claim 4, characterized in that: The flashover voltage result is determined according to the ratio between the umbrella width and the umbrella pitch.

6. A composite insulator umbrella type determination device, characterized in that: comprising a processor configured to: Obtain structural parameters of each candidate umbrella type; Based on the structural parameters, construct simulation models of various umbrella types respectively; According to the simulated rainfall conditions applied to each of the simulation models, the creepage distance result and the flashover voltage result corresponding to each of the simulation models are calculated in turn; Based on the creepage distance result and the flashover voltage result, sequentially calculating the performance weighted state value of each simulation model under different simulated rainfall conditions; The selection result of the composite insulator umbrella type is determined according to the detected actual rainfall conditions and the performance weighted state values ​​corresponding to each of the simulation models.

7. The composite insulator umbrella type determination device according to claim 6, characterized in that: The alternative umbrella types at least include an equal-diameter umbrella type, a large-small umbrella type, and a large-small-small-medium-small-small-large umbrella type.

8. The composite insulator umbrella type determination device according to claim 7, characterized in that: The structural parameters at least include umbrella width, umbrella pitch, disk diameter and structural height.

9. The composite insulator umbrella type determination device according to claim 8, characterized in that: The creepage distance result of the equal diameter umbrella type is calculated by the following formula: D1=(n1-1)×d1 Where D1 is the creepage distance of the equal-diameter shed, d1 is the longitudinal distance between adjacent sheds, and n is the number of sheds; The creepage distance result of the large-small umbrella type is calculated by the following formula: D2=n2×(f1+f2+f3) Wherein, D2 is the creepage distance of the large-small umbrella type, f1 is the endpoint distance between the large umbrella skirt at the top and the middle umbrella skirt in the middle, f2 is the longitudinal distance between the middle umbrella skirt in the middle and the large umbrella skirt at the bottom, f3 is the projection distance of the middle umbrella skirt in the middle on the large umbrella skirt at the bottom, and n2 is the number of large-small umbrellas; The creepage distance results of the large-small-small-medium-small-small-large umbrella type are calculated using the following formula: D3=n3×(l1+l2+l3+l4+l5+l6) Among them, D3 is the creepage distance of the large-small-small-medium-small-small-large umbrella type, l1, l2, l3, l4, l5 and l6 are the discharge paths between adjacent umbrella skirts in the large-small-small-medium-small-small-large umbrella type respectively, and n3 is the number of large-small-small-medium-small-small-large umbrellas.

10. The composite insulator umbrella type determination device according to claim 9, characterized in that: The flashover voltage result is determined according to the ratio between the umbrella width and the umbrella pitch.

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