Power overhead line cross arrangement design method and design system

Abstract

The invention relates to the technical field of arrangement methods of overhead transmission lines, in particular to a design method and a design system for crossed arrangement of power overhead lines. Comprising the steps of arranging an upper-layer power line ground wire on an upper-layer power line tower; constructing an equivalent lightning rod corresponding to the upper-layer power line ground wire on the lower-layer power line based on the arrangement conditions of the upper-layer power line ground wire, the lower-layer power line lead and the lower-layer power line tower; dividing a ground wire protection area and a lightning rod protection area; determining the height of a lightning rod required by a lower-layer power line tower on the corresponding side based on the lightning rod protection area; lightning rods with corresponding heights are arranged on the top of the lower-layer power line tower. The device is used for crossing transformation of high and low voltage lines, can effectively reduce the height difference between the lead of the upper-layer power line and the lead of the lower-layer power line, and reduces the cost and difficulty of line transformation.

Description

Technical Field

[0001] The invention relates to the technical field of overhead power transmission line layout methods, and in particular to a cross layout design method and a design system for overhead power lines. Background Art

[0002] When erecting high-voltage lines, in addition to live conductors, towers also need to install lightning protection ground wires above the conductors. The main function of the ground wire is to prevent the conductors from being struck by lightning or induced lightning overvoltage. According to Article 7.0.13 of the National Standard "110kV~750kV Overhead Transmission Line Design Specifications (GB50545-2010)", 110kV transmission lines should be equipped with ground wires along the entire line; 220kV~330kV transmission lines should be equipped with ground wires along the entire line; 500kV~750kV transmission lines should be equipped with double ground wires along the entire line. According to Article 6.0.14 of the National Standard "66kV and Below Overhead Power Line Design Specifications (GB50061-2010)", for 66kV overhead power lines, ground wires should be installed along the entire line in areas with an average annual number of thunderstorm days of more than 30 days. It can be seen that most of the 66kV and above high-voltage lines in my country are equipped with lightning arresters on top.

[0003] Due to the need for long-distance power transmission, it is inevitable that high-voltage overhead power lines cross in the air. Generally, the high-voltage line is located at the top, and the lower-voltage line passes through the bottom. The height of the upper line must be determined based on the height of the lower line itself and after considering the safety distance. If the upper line is an existing operating line and the lower line is to pass through from the bottom, in order to maintain a safe distance, it is often necessary to untie one or more conductors of the upper line and replace the original tower with a higher tower that meets the safety distance. This is called "raising" the original line.

[0004] There is a certain safety distance requirement between the ground wire of the low-voltage power line below and the lowest conductor of the high-voltage power line above and the highest conductor of the low-voltage power line below. Usually, in order to avoid mutual influence and protect the conductor of the low-voltage power line below, the vertical distance between the ground wire of the low-voltage power line and the lowest conductor of the high-voltage power line needs to be large enough. This leads to the reconstruction of the original high-voltage power tower. During the reconstruction of the original line, power outages are often required. The coordination time of power outages is long and the cost is high. The original towers need to be scrapped, resulting in large direct and indirect economic losses. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a method and system for designing the cross layout of power overhead lines.

[0006] The technical solution of the present invention is: a method for designing the cross layout of power overhead lines, comprising:

[0007] Arranging an upper power line ground wire on an upper power line tower of an upper power line crossing over a lower power line;

[0008] Based on the arrangement of the upper power line ground wire, the lower power line conductor and the lower power line tower, an equivalent lightning rod corresponding to the upper power line ground wire is constructed on the lower power line;

[0009] The area between the equivalent lightning rod and the ground wire of the upper power line is the ground wire protection area, and the area between the equivalent lightning rod and the lower power line tower is the lightning rod protection area;

[0010] Determine the height of the lightning rod required for the lower power line tower on the corresponding side based on the lightning rod protection area;

[0011] Arrange lightning rods of corresponding height on the top of the lower power line tower.

[0012] According to a method for designing the cross layout of overhead power lines provided in the present application, the method for arranging an upper power line ground wire on an upper power line tower of an upper power line crossing a lower power line includes: arranging an upper power line ground wire above the uppermost upper power line conductor of the upper power line tower.

[0013] According to a method for designing the cross layout of overhead power lines provided in the present application, the method for constructing an equivalent lightning rod corresponding to the ground wire of an upper power line includes: constructing an equivalent lightning rod with the same height as the ground wire of an upper power line in an area between a lower power line and the ground wire of an upper power line based on the height of the ground wire of the upper power line, the width of a lower power line conductor, and the height of a lower power line conductor.

[0014] According to a method for designing the cross layout of overhead power lines provided by the present application, the minimum width of the joint protection of the lightning rod and the upper power line ground wire is determined based on the width of the lower power line conductor, and the spacing between the equivalent lightning rod and the upper power line in the direction of the lower power line conductor is obtained by looking up a map based on the minimum width of the joint protection of the lightning rod and the upper power line ground wire, the height of the lower power line conductor, the height of the upper power line ground wire, and height influencing factors.

[0015] According to a method for designing the cross layout of overhead power lines provided in the present application, the method for determining the height of a lightning rod includes: determining the height of the lightning rod required for the lower power line tower based on the height and position of the equivalent lightning rod and the position of the lower power line tower on the corresponding side; if the height of the upper power line ground wire is not less than a set value, calculating the height of the lightning rod required for the lower power line tower according to the following formula:

[0016] H1=h1+r x / P

[0017] Where: H1 – the height of the lightning rod required for the lower power line tower;

[0018] h1 – the height of the ground wire of the upper power line;

[0019] r x - the distance between the lightning rod required for the lower power line tower and the equivalent lightning rod;

[0020] P——Highly influential factor;

[0021] If the height of the upper power line ground wire is less than the set value, the height of the lightning rod required for the lower power line tower is calculated according to the following formula:

[0022] H1=[(D1-D max ) / P+2h1] / 1.5

[0023] Where: H1 – the height of the lightning rod required for the lower power line tower;

[0024] h1 – the height of the ground wire of the upper power line;

[0025] D1 - the distance between the lower power line tower and the upper power line ground wire;

[0026] P——High impact factor.

[0027] The present application also provides a high-voltage overhead power line cross layout design system, the design system operates according to the above-mentioned overhead power line cross layout design method, including:

[0028] A ground line construction module, the ground line construction module is used to arrange an upper power line ground line on an upper power line tower of an upper power line crossing a lower power line;

[0029] An equivalent lightning rod construction module, which constructs an equivalent lightning rod corresponding to the upper power line ground wire on the lower power line based on the arrangement of the upper power line ground wire, the lower power line conductor and the lower power line tower;

[0030] A protection area determination module, the protection area determination module is used to divide the area between the lower power line tower and the upper power line ground wire into a ground wire protection area and a lightning rod protection area;

[0031] A lightning rod height determination module, which determines the height of the lightning rod required for the lower power line tower on the corresponding side based on the lightning rod protection area;

[0032] A lightning rod construction module is used to construct a lightning rod on the lower power line tower according to the calculated height of the lightning rod required by the lower power line tower.

[0033] According to a high-voltage overhead power line crossing layout design system provided by the present application, the equivalent lightning rod construction module constructs an equivalent lightning rod with the same height as the upper power line ground wire in the area between the lower power line and the upper power line ground wire based on the height of the upper power line ground wire, the width of the lower power line conductor and the height of the lower power line conductor.

[0034] According to a high-voltage overhead power line crossing layout design system provided by the present application, the equivalent lightning rod construction module determines the minimum width of the joint protection of the lightning rod and the upper power line ground wire based on the width of the lower power line conductor, and obtains the spacing between the equivalent lightning rod and the upper power line in the direction of the lower power line conductor based on the minimum width of the joint protection of the lightning rod and the upper power line ground wire, the height of the lower power line conductor, the height of the upper power line ground wire, and height influencing factors.

[0035] According to a high-voltage overhead power line crossing layout design system provided by the present application, the protection area determination module is used to divide the area between the equivalent lightning rod and the upper power line ground wire into the ground wire protection area, and divide the area between the equivalent lightning rod and the lower power line tower into the lightning rod protection area.

[0036] According to a high-voltage overhead power line cross layout design system provided by the present application, the lightning rod height determination module calculates the height of the lightning rod required for the lower power line tower according to the following formula when the height of the upper power line ground wire is not less than a set value:

[0037] H1=h1+r x / P

[0038] Where: H1 – the height of the lightning rod required for the lower power line tower;

[0039] h1 – the height of the ground wire of the upper power line;

[0040] r x - the distance between the lightning rod required for the lower power line tower and the equivalent lightning rod;

[0041] P——Highly influential factor;

[0042] When the height of the upper power line ground wire is less than the set value, the height of the lightning rod required for the lower power line tower is calculated according to the following formula:

[0043] H1=[(D1-D max ) / P+2h1] / 1.5

[0044] Where: H1 – the height of the lightning rod required for the lower power line tower;

[0045] h1 – the height of the ground wire of the upper power line;

[0046] D1 - the distance between the lower power line tower and the upper power line ground wire;

[0047] P——High impact factor.

[0048] According to a high-voltage overhead power line cross layout design system provided by the present application, the ground wire construction module is used to arrange an upper power line ground wire above the upper power line conductor on the uppermost layer of the upper power line tower.

[0049] The advantages of the present application are as follows: 1. The present application arranges a lightning rod on the top of the lower power line tower to form a joint lightning protection with the lightning conductor of the upper power line, so as to replace the lightning protection function of the lower power line crossing the ground wire. There is no need to configure the lower power line ground wire in the lower power line. The height difference between the conductor of the upper power line and the guide of the lower power line can be greatly reduced, thereby greatly reducing the crossing height of the upper power line, avoiding or reducing the cost of high-voltage line transformation and power outage time, making line transformation easier and reducing the transformation cost. At the same time, the present application can accurately calculate the installation height of the lightning rod, provide a complete design calculation method for line transformation, and improve the efficiency of line transformation;

[0050] 2. The present application arranges the upper power line ground wire directly on the upper power line conductor of the uppermost layer of the upper power line tower. The upper power line ground wire is at the uppermost layer, which can provide lightning protection for the upper power line and the lower power line below. At the same time, it does not affect the vertical spacing between the upper power line and the lower power line. The line crossing does not cause interference, which is convenient for arrangement.

[0051] 3. The method of determining the ground wire protection area of ​​the present application is very simple. In fact, the intersection of the upper power line ground wire and the lower power line conductor is calculated as a lightning rod. A lightning rod model is constructed to calculate the lightning protection range of the height at that location. The ground wire protection area of ​​the upper power line ground wire can be quickly determined, which provides a basis for the subsequent calculation of the height of the lightning rod, facilitates subsequent further calculations, and can also ensure good lightning protection for the entire lower power line.

[0052] 4. The method for determining the height of the lightning rod in the present application is very simple. After determining the ground wire protection area, the area that the lightning rod should protect can be determined based on the area between the lower power line towers. The height of the lightning rod can be determined based on the area that the lightning rod should protect. The calculation is simple, and the result can completely cover the lower power line, ensuring a good lightning protection effect.

[0053] 5. This application constructs an equivalent lightning rod based on the upper power line ground wire. The equivalent lightning rod is virtual, which is convenient for subsequent calculation operations. By constructing an equivalent lightning rod, the ground wire protection area can be determined, which is convenient for determining the subsequent lightning rod height. The entire calculation meets the design requirements and is simple to operate.

[0054] The present application sets a lightning rod on the top of the lower power line tower to form a joint lightning protection with the upper power line lightning conductor, which can effectively reduce the height difference between the conductor of the upper power line and the guide of the lower power line, and reduce the cost and difficulty of line transformation. The present application can quantitatively analyze the height of the lightning rod during the line transformation process and accurately transform the line. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 : Schematic diagram of the upper power line and the lower power line crossing of the present application;

[0056] Figure 2 : Schematic diagram of the plane projection of the upper power line and the lower power line of the present application;

[0057] Figure 3 : Schematic diagram of the construction of the equivalent lightning rod of the present application;

[0058] Among them: 1—upper power line tower; 2—upper power line conductor; 3—upper power line ground wire; 4—lower power line tower; 5—lower power line conductor; 6—lightning rod; 7—equivalent lightning rod. DETAILED DESCRIPTION

[0059] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0060] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0062] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0063] The present application relates to a design method for the cross layout of overhead power lines. The present application is used in the technical field of high and low voltage line crossing reconstruction. It can be that there is a lower power line at the bottom first, and then the upper power line is crossed on the lower power line; it can also be that there is an upper power line at the top first, and then the lower power line is crossed under the upper power line. Figure 1 As shown, the upper power line includes upper power line towers 1 on both sides and upper power line conductors 2 between two groups of upper power line towers 1. The uppermost layer of the upper power line conductor 2 is designed with an upper power line ground wire 3. The two ends of the upper power line ground wire 3 are consistent with the upper power line towers 1 on both sides and the extension direction of the upper power line conductor 2, which plays a role in lightning protection for the lower upper power line conductor 2. The lower power line includes lower power line towers 4 on both sides and a lower power line conductor 5 between the two groups of lower power line towers 4. The projection of the lower power line conductor 5 on the plane intersects with the upper power line conductor 2, that is, the lower power line conductor 5 passes under the upper power line conductor 2.

[0064] As described in the background technology, when this kind of high and low voltage line crossing construction is currently carried out, the lower power line is also equipped with a lower power line ground wire, and the lower power line ground wire is below the lowest upper power line conductor 2, that is, there is a height difference between the lower power line ground wire and the lowest upper power line conductor 2. When the upper power line crossing construction is carried out, this height difference needs to be guaranteed, which leads to the subsequent arrangement of other upper power line conductors 2 (the spacing between the vertically adjacent upper power line conductors 2 must also be guaranteed) The height is getting higher and higher, and finally it is necessary to build a higher upper power line tower 1, which greatly increases the construction cost and difficulty. In order to solve this technical problem, the present application cancels the lower power line ground wire in the lower power line, and solves this problem by installing a lightning rod 6 on the lower power line tower 4. Since the lower power line ground wire is cancelled, it is sufficient to ensure the vertical spacing between the uppermost lower power line conductor 5 and the lowermost upper power line conductor 2. In this way, the vertical spacing between the upper upper power line and the lower lower power line conductor 5 is greatly reduced, the scale and height of the subsequent upper power line tower 1 are reduced, and the construction cost and difficulty of repair are greatly reduced.

[0065] By installing a lightning rod 6 on the lower power line tower 4 to cooperate with the upper power line ground wire 3 for lightning protection, the scale, cost and difficulty of the construction of the upper power line tower 1 can be greatly reduced. Taking the lower power line first and the upper power line later modified as an example, the method for designing the lightning rod 6 and the upper power line can be carried out according to the following steps:

[0066] S1, arranging an upper power line ground wire 3 on an upper power line tower 1 of an upper power line crossing a lower power line;

[0067] S2, based on the arrangement of the upper power line ground wire 3, the lower power line conductor 5 and the lower power line tower 4, an equivalent lightning rod 7 corresponding to the upper power line ground wire 3 is constructed on the lower power line; the area between the equivalent lightning rod 7 and the upper power line ground wire 3 is the ground wire protection area, and the area between the equivalent lightning rod 7 and the lower power line tower 4 is the lightning rod protection area;

[0068] S3, based on the lightning rod protection area, determine the height of the lightning rod 6 required for the lower power line tower 4 on the corresponding side;

[0069] S4. Arrange a lightning rod 6 of corresponding height on the top of the lower power line tower 4.

[0070] In some embodiments of the present application, this embodiment optimizes the above step S1. Specifically, the method for arranging the upper power line ground wire 3 on the upper power line tower 1 of the upper power line crossing the lower power line is as follows: Figure 1 As shown, an upper power line ground wire 3 is arranged above the upper power line conductor 2 of the upper power line tower 1. The upper power line ground wire 3 of the uppermost layer is consistent with the extension direction of the upper power line conductor 2 below, and the vertical spacing between the upper power line ground wire 3 and the uppermost upper power line conductor 2 below can be obtained according to the layout manual.

[0071] Meanwhile, if there is a lower power line ground wire in the existing lower power line, the installed lower power line ground wire needs to be removed.

[0072] In the case where an upper power line exists and the lower power line is subsequently reconstructed, the upper power line ground wire 3 already exists, and in the subsequent lower power line reconstruction process, there is no need to configure the lower power line ground wire.

[0073] In other embodiments of the present application, the present embodiment optimizes the above step S2. According to the above, in either case, the upper power line ground wire 3 is already determined, that is, the cross arrangement of the upper power line ground wire 3 and the lower power line conductor 5 is determined, the angle between the upper power line ground wire 3 and the projection of the lower power line on the horizontal plane is determined, and the intersection point of the upper power line ground wire 3 and the projection of the lower power line on the horizontal plane is determined (such as Figures 1-2 O shown in the figure), so the height of the intersection position corresponding to the upper power line ground line 3 is h1 (that is, the height of the upper power line ground line 3) is known, such as Figures 1-2 As shown, the distance S1 between the lower power line towers 4 on both sides is known, the horizontal spacing D1 between the corresponding intersection positions of the lower power line conductors 5 and the lower power line towers 4 on one side and the horizontal spacing D2 between the lower power line towers 4 on the other side are known; the lower power line already exists, and the spacing E between the two outermost lower power line conductors 5 in the lower power line in the horizontal direction is determined.

[0074] First, based on the height h1 of the upper power line ground wire 3, the height influencing factor P can be obtained, h1≤30m, P=l;30m h1>120m, P=0.5;

[0075] Secondly, if Figure 2 As shown, based on the width E of the lower power line conductor 5 (such as Figure 2 As shown, it refers to the distance between the two outermost lower power line conductors 5 on the plane projection, such as Figure 2 E) in the figure can calculate the minimum width b of the combined protection of the lightning rod 6 and the upper power line ground wire 3 x (like Figure 2 The b shown​x ), according to the requirements of power line layout, b x =0.5E;

[0076] Furthermore, an equivalent lightning rod 7 is constructed based on the upper power line ground wire 3, such as Figure 3 As shown, the height of the equivalent lightning rod 7 is equal to the height of the upper power line ground wire 3. The equivalent lightning rod 7 is a virtual structure, which is used to determine the lightning protection area of ​​the upper power line ground wire 3. The area between the upper power line ground wire 3 and the equivalent lightning rod 7 is the ground wire protection area.

[0077] The construction of the equivalent lightning rod 7 is based on the upper power line ground wire 3, and the equivalent lightning rod 7 is set on the center line of the lower power line (such as Figure 2 The height of the equivalent lightning rod 7 is the height h1 of the upper power line ground wire 3; the maximum distance D between the equivalent lightning rod 7 and the upper power line ground wire 3 is between the intersection of the upper power line ground wire 3 and the lower power line conductor 5 and the lower power line tower 4. max The distance between the equivalent lightning rod 7 and the upper power line ground wire 3 in the extension direction of the lower power line conductor can be based on the height h1 of the upper power line ground wire 3, the minimum width b of the combined protection of the lightning rod 6 and the upper power line ground wire 3, and the minimum width b of the combined protection of the lightning rod 6 and the upper power line ground wire 3. x And the height influencing factor P is obtained by looking up the chart (national standard "Overvoltage Protection and Insulation Coordination Design Specification for AC Electrical Installations" (GB / T50064-2014)).

[0078] Based on the maximum distance D between the equivalent lightning rod 7 and the upper power line ground wire 3 max The position and height of the equivalent lightning rod 7 can be obtained by calculating the height h1 of the ground wire 3 of the upper power line.

[0079] In a further embodiment of the present application, the present embodiment optimizes the above-mentioned step S3. Specifically, the method for determining the height of the lightning rod 6 required for the corresponding side lower power line tower 4 includes: if it is assumed that the height of the upper power line ground wire 3 is not less than the set value (the set value is 0.5H1, and other set values ​​can be selected in actual application to meet the needs), the height of the lightning rod 6 required for the lower power line tower 4 is calculated according to the following formula:

[0080] H1=h1+r x / P

[0081] Where: H1 - the height of the lightning rod 6 required for the lower power line tower 4;

[0082] h1——the height of the upper power line ground wire 3;

[0083] r x - the distance between the lightning rod 6 and the equivalent lightning rod 7 required for the lower power line tower 4;

[0084] P——Highly influential factor;

[0085] If it is assumed that the height of the upper power line ground wire 3 is less than the set value (the set value is 0.5H1, and other set values ​​can be selected in actual application to meet the needs), the height of the lightning rod 6 required for the lower power line tower 4 is calculated according to the following formula:

[0086] H1=[(D1-D max ) / P+2h1] / 1.5

[0087] Where: H1 - the height of the lightning rod 6 required for the lower power line tower 4;

[0088] h1——the height of the upper power line ground wire 3;

[0089] D1——the distance between the lower power line tower 4 and the upper power line ground wire 3;

[0090] P——High impact factor.

[0091] That is to say, when calculating the height of the lightning rod 6 required for the lower power line tower 4, it is first assumed that the height of the lightning rod 6 required for the lower power line tower 4 is compared with the height of the upper power line ground wire 3, and the final calculation method is determined by two formulas. If one formula has no solution, then another formula is selected for calculation.

[0092] After determining the position of the equivalent lightning rod 7, the area between the upper power line ground wire 3 and the lower power line tower 4 is actually divided, with the area between the equivalent lightning rod 7 and the upper power line ground wire 3 as the ground wire protection area, and the area between the equivalent lightning rod 7 and the lower power line tower 4 as the lightning rod protection area. The lightning rod protection area cannot be protected by the upper power line ground wire 3, so this part of the lower power line conductor 5 needs to be protected by the lightning rod 6 installed on the lower power line tower 4. The distance r between the lightning rod 6 and the equivalent lightning rod 7 required by the lower power line tower 4 is x It is the minimum distance of the lightning rod protection area. Based on the above formula, the height H1 of the lightning rod 6 required for the lower power line tower 4 can be calculated.

[0093] In other embodiments of the present application, the present embodiment optimizes the above step S4. Specifically, after determining the height H1 of the lightning rod 6 required for the lower power line tower 4 according to the above method, the lightning rod 6 on the lower power line tower 4 can be installed according to this data, as long as the height of the lightning rod 6 on the lower power line tower 4 is not less than the height H1 of the lightning rod 6 required for the lower power line tower 4. The height H1 of the lightning rod 6 required for the lower power line tower 4 and the maximum distance D between the equivalent lightning rod 7 and the upper power line ground wire 3 max It is a limit value, which constructs an ideal situation. Therefore, in actual use, it is only necessary that the height of the lightning rod 6 constructed last exceeds the height H1 of the lightning rod 6 required by the lower power line tower 4.

[0094] During actual construction, the upper power line ground wire 3 is arranged on the tower of the upper power line crossing the lower power line; based on the height h1 of the upper power line ground wire 3, the height influencing factor P can be obtained, and based on the width E of the lower power line conductor 5, the minimum width b of the combined protection of the lightning rod 6 and the upper power line ground wire 3 can be calculated. x Based on the upper power line ground wire 3, an equivalent lightning rod 7 is constructed, based on the height h1 of the upper power line ground wire 3, the minimum width b of the combined protection of the lightning rod 6 and the upper power line ground wire 3 x And the height influencing factor P is obtained by looking up the diagram to obtain the maximum distance D between the equivalent lightning rod 7 and the upper power line ground wire 3 max ; Based on the height and position of the equivalent lightning rod 7 and the position and height of the corresponding lower power line tower 4, the height of the lightning rod 6 required for the lower power line tower 4 is determined. If it is assumed that the height of the upper power line ground wire 3 is not less than 0.5H1, the height of the lightning rod 6 required for the lower power line tower 4 is calculated according to the following formula:

[0095] H1=h1+r x / P

[0096] Where: H1 - the height of the lightning rod 6 required for the lower power line tower 4;

[0097] h1——the height of the upper power line ground wire 3;

[0098] r x - the distance between the lightning rod 6 and the equivalent lightning rod 7 required for the lower power line tower 4;

[0099] P——Highly influential factor;

[0100] If the above formula has no solution, assuming that the height of the upper power line ground wire 3 is less than 0.5H1, the height of the lightning rod 6 required for the lower power line tower 4 is calculated according to the following formula:

[0101] H1=[(D1-D max ) / P+2h1] / 1.5

[0102] Where: H1 - the height of the lightning rod 6 required for the lower power line tower 4;

[0103] h1——the height of the upper power line ground wire 3;

[0104] D1——the distance between the lower power line tower 4 and the upper power line ground wire 3;

[0105] P——Highly influential factor;

[0106] Finally, a lightning rod 6 of a corresponding height is arranged on the top of the lower power line tower 4 according to the height H1 of the lightning rod 6 required by the lower power line tower 4 .

[0107] The present application also relates to a high-voltage overhead power line cross layout design system. Specifically, the design system of the present application includes a ground wire construction module, an equivalent lightning rod construction module, a protection area determination module, a lightning rod height determination module and a lightning rod construction module. The ground wire construction module is used to arrange the upper power line ground wire on the upper power line tower of the upper power line crossing the lower power line; the equivalent lightning rod construction module constructs an equivalent lightning rod corresponding to the upper power line ground wire on the lower power line based on the arrangement of the upper power line ground wire, the lower power line conductor and the lower power line tower; the protection area determination module is used to divide the area between the lower power line tower and the upper power line ground wire into a ground wire protection area and a lightning rod protection area; the lightning rod height determination module determines the height of the lightning rod required for the lower power line tower on the corresponding side based on the lightning rod protection area; the lightning rod construction module constructs the lightning rod on the lower power line tower according to the calculated height of the lightning rod required for the lower power line tower.

[0108] The equivalent lightning rod construction module constructs an equivalent lightning rod with the same height as the upper power line ground wire in the area between the lower power line and the upper power line ground wire based on the height of the upper power line ground wire, the lower power line conductor width and the height of the lower power line conductor.

[0109] The equivalent lightning rod construction module determines the minimum width of the combined protection of the lightning rod and the upper power line ground wire based on the width of the lower power line conductor, and obtains the spacing between the equivalent lightning rod and the upper power line in the direction of the lower power line conductor based on the minimum width of the combined protection of the lightning rod and the upper power line ground wire, the height of the lower power line conductor, the height of the upper power line ground wire, and height influencing factors.

[0110] The protection area determination module is used to divide the area between the equivalent lightning rod and the upper power line ground wire into the ground wire protection area, and divide the area between the equivalent lightning rod and the lower power line tower into the lightning rod protection area.

[0111] The lightning rod height determination module calculates the height of the lightning rod required for the lower power line tower according to the following formula when the height of the upper power line ground wire is not less than the set value:

[0112] H1=h1+r x / P

[0113] Where: H1 – the height of the lightning rod required for the lower power line tower;

[0114] h1 – the height of the ground wire of the upper power line;

[0115] r x - the distance between the lightning rod required for the lower power line tower and the equivalent lightning rod;

[0116] P——Highly influential factor;

[0117] When the height of the upper power line ground wire is less than the set value, the height of the lightning rod required for the lower power line tower is calculated according to the following formula:

[0118] H1=[(D1-D max ) / P+2h1] / 1.5

[0119] Where: H1 – the height of the lightning rod required for the lower power line tower;

[0120] h1 – the height of the ground wire of the upper power line;

[0121] D1 - the distance between the lower power line tower and the upper power line ground wire;

[0122] P——High impact factor.

[0123] The ground wire construction module is used to arrange an upper power line ground wire above the upper power line conductor on the uppermost layer of the upper power line tower.

[0124] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for designing the cross layout of power overhead lines, characterized in that: include, Arranging an upper power line ground wire on an upper power line tower of an upper power line crossing over a lower power line; Based on the arrangement of the upper power line ground wire, the lower power line conductor and the lower power line tower, an equivalent lightning rod corresponding to the upper power line ground wire is constructed on the lower power line; The area between the equivalent lightning rod and the ground wire of the upper power line is the ground wire protection area, and the area between the equivalent lightning rod and the lower power line tower is the lightning rod protection area; Determine the height of the lightning rod required for the lower power line tower on the corresponding side based on the lightning rod protection area; Arrange lightning rods of corresponding height on the top of the lower power line tower.

2. A method for designing the cross layout of power overhead lines according to claim 1, characterized in that: The method for arranging an upper power line ground wire on an upper power line tower of an upper power line crossing a lower power line comprises: arranging an upper power line ground wire above the uppermost upper power line conductor of the upper power line tower.

3. A method for designing the cross layout of power overhead lines according to claim 1, characterized in that: The method for constructing an equivalent lightning rod corresponding to the upper power line ground wire includes: constructing an equivalent lightning rod with the same height as the upper power line ground wire in an area between the lower power line and the upper power line ground wire based on the height of the upper power line ground wire, the width of the lower power line conductor and the height of the lower power line conductor.

4. A method for designing the cross layout of power overhead lines according to claim 1, characterized in that: The minimum width of the combined protection of the lightning rod and the upper power line ground wire is determined based on the width of the lower power line conductor. The distance between the equivalent lightning rod and the upper power line in the direction of the lower power line conductor is obtained by looking up the map based on the minimum width of the combined protection of the lightning rod and the upper power line ground wire, the height of the lower power line conductor, the height of the upper power line ground wire and the height influencing factors.

5. A method for designing the cross layout of power overhead lines according to claim 3, characterized in that: The method for determining the height of the lightning rod comprises: determining the height of the lightning rod required for the lower power line tower based on the height and position of the equivalent lightning rod and the position of the lower power line tower on the corresponding side; if the height of the upper power line ground wire is not less than the set value, calculating the height of the lightning rod required for the lower power line tower according to the following formula: H1=h1+r x / P Where: H1 – the height of the lightning rod required for the lower power line tower; h1 – the height of the ground wire of the upper power line; r x - the distance between the lightning rod required for the lower power line tower and the equivalent lightning rod; P——Highly influential factor; If the height of the upper power line ground wire is less than the set value, the height of the lightning rod required for the lower power line tower is calculated according to the following formula: H1=[(D1-D max ) / P+2h1] / 1.5 Where: H1 – the height of the lightning rod required for the lower power line tower; h1 – the height of the ground wire of the upper power line; D1 - the distance between the lower power line tower and the upper power line ground wire; P——High impact factor.

6. A high-voltage power overhead line cross layout design system, characterized by: The design system is operated according to a method for designing the cross layout of power overhead lines as claimed in any one of claims 1 to 5, include, A ground wire construction module, the ground wire construction module is used to arrange an upper power line ground wire on an upper power line tower of an upper power line crossing a lower power line; An equivalent lightning rod construction module, which constructs an equivalent lightning rod corresponding to the upper power line ground wire on the lower power line based on the arrangement of the upper power line ground wire, the lower power line conductor and the lower power line tower; A protection area determination module, the protection area determination module is used to divide the area between the lower power line tower and the upper power line ground wire into a ground wire protection area and a lightning rod protection area; A lightning rod height determination module, which determines the height of the lightning rod required for the lower power line tower on the corresponding side based on the lightning rod protection area; A lightning rod construction module is used to construct a lightning rod on the lower power line tower according to the calculated height of the lightning rod required by the lower power line tower.

7. A high-voltage power overhead line cross layout design system as claimed in claim 6, characterized in that: The equivalent lightning rod construction module constructs an equivalent lightning rod with the same height as the upper power line ground wire in the area between the lower power line and the upper power line ground wire based on the height of the upper power line ground wire, the lower power line conductor width and the height of the lower power line conductor.

8. A high-voltage power overhead line cross layout design system as claimed in claim 7, characterized in that: The equivalent lightning rod construction module determines the minimum width of the combined protection of the lightning rod and the upper power line ground wire based on the width of the lower power line conductor, and obtains the spacing between the equivalent lightning rod and the upper power line in the direction of the lower power line conductor based on the minimum width of the combined protection of the lightning rod and the upper power line ground wire, the height of the lower power line conductor, the height of the upper power line ground wire, and height influencing factors.

9. A high-voltage power overhead line cross layout design system as claimed in claim 6, characterized in that: The lightning rod height determination module calculates the height of the lightning rod required for the lower power line tower according to the following formula when the height of the upper power line ground wire is not less than the set value: H1=h1+r x / P Where: H1 – the height of the lightning rod required for the lower power line tower; h1 – the height of the ground wire of the upper power line; r x - the distance between the lightning rod required for the lower power line tower and the equivalent lightning rod; P——Highly influential factor; When the height of the upper power line ground wire is less than the set value, the height of the lightning rod required for the lower power line tower is calculated according to the following formula: H1=[(D1-D max ) / P+2h1] / 1.5 Where: H1 – the height of the lightning rod required for the lower power line tower; h1 – the height of the ground wire of the upper power line; D1 - the distance between the lower power line tower and the upper power line ground wire; P——High impact factor.

10. A high-voltage overhead power line cross layout design system as claimed in claim 6, characterized in that: The ground wire construction module is used to arrange an upper power line ground wire above the upper power line conductor on the uppermost layer of the upper power line tower.

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