Calculation method for improving lightning protection precision of broken line method

Abstract

The invention discloses a calculation method for improving the lightning protection precision of a broken line method, and the method comprises the steps: dividing each curve in a relation curve of the minimum width # imgabs0 # and D / (# imgabs1 # P) of one side of a protection range between two equal-height lightning rods into a plurality of straight line segments, obtaining the value of each straight line segment according to the horizontal and vertical coordinates of a head point and a tail point, and obtaining a unary linear regression equation y = a + bx of the straight line segment, and if not, calculating and substituting x according to D / (# imgabs2 # P) so as to obtain a y value, namely the value of # imgabs3 # / (# imgabs4 # P), and finally calculating the minimum protection width # imgabs5 #. A curve in a specification is divided into a plurality of straight line segments, each straight line segment forms a unary linear regression equation, a vertical coordinate y = bx / (haP) value can be accurately calculated according to a horizontal coordinate x = D / (haP) calculation value, and then the minimum protection width bx can be accurately calculated; each unary linear regression equation is written into an EXCEL table in advance to establish a database, so that the calculation accuracy and efficiency can be greatly improved; the uniqueness of calculation results can be ensured, and the situation that different calculation results are different due to value deviation during calculation of different persons is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of lightning protection, and in particular to a calculation method for improving the accuracy of lightning protection using a broken line method. Background Art

[0002] The broken line lightning protection calculation method is the main calculation method used in power engineering design. The calculation is based on the lightning overvoltage and protection requirements in Chapter 5 of the "Design Specification for Overvoltage Protection and Insulation Coordination of AC Electrical Installations" (GB / T50064-2014). When calculating the minimum protection width, designers often use D / (h a P) Calculate the value to determine the attached Figure 1 The horizontal coordinate in the figure is then calculated based on the height h of the protected object. x The ratio of the height of the lightning rod to the height of the lightning rod (h x / h) Determine the attachment Figure 1 Which curve in the Figure 1 The horizontal coordinate and the determined curve are checked in the figure to determine the vertical coordinate b x / (h a P) value, the determined value is multiplied by h a P (known value) can calculate the minimum protection width b x .

[0003] The main factor affecting the calculation accuracy is the minimum protection width b x In the actual calculation process, the horizontal coordinate value is taken according to the vertical coordinate b on different curves. x / (h a The value of P) is mainly determined based on the subjective consciousness of the designer. Different people may have different values ​​under the same calculation conditions, which leads to the minimum protection width b x The calculation result is not unique and the calculation accuracy is not high. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a calculation method for improving the accuracy of the broken line method lightning protection, aiming to solve the problem of the minimum protection width b in the existing discounted method lightning protection calculation. x The calculation accuracy is not high.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A calculation method for improving the accuracy of broken line method lightning protection, the method comprising: The minimum width of one side of the protection range between two lightning rods of equal height With D / ( Each curve in the relationship curve of P) is divided into multiple straight line segments. Each straight line segment takes values ​​according to the horizontal and vertical coordinates of the first and last points, and the linear regression equation y=a+b of the straight line segment is obtained.x , then according to D / ( P) Calculate and substitute x , and then find the y value, / ( P) value, and ( P) value is known, and finally the minimum protection width can be calculated .

[0006] The minimum width of one side of the protection range between two lightning rods of equal height is With D / ( When each curve in the relationship curve of P) is divided into multiple straight line segments, the multiple straight line segments have the minimum width With D / ( There are many types of horizontal axis intervals on the relationship curve of P).

[0007] The minimum width of one side of the protection range between two lightning rods of equal height is With D / ( When each curve in the relationship curve of P) is divided into multiple straight line segments, the multiple straight line segments have the minimum width With D / ( P) is divided into two types of horizontal coordinate intervals, and the horizontal coordinate intervals of the straight line segments are from large to small according to the horizontal coordinates from small to large.

[0008] The minimum width of one side of the protection range between two lightning rods of equal height is With D / ( When each curve in the relationship curve of P) is divided into multiple straight line segments, the multiple straight line segments have the minimum width With D / ( There are two types of horizontal coordinate intervals on the relationship curve of P. As the horizontal coordinate increases, the horizontal coordinate interval of the first multiple straight line segments is 1, and the horizontal coordinate interval of the latter multiple straight line segments is 0.2.

[0009] The linear regression equation y=a+b obtained for each straight line segment obtained above x , then each straight line segment can know its two endpoints of the horizontal coordinate, the two endpoints of the vertical coordinate, and the linear regression equation of the straight line segment y=a+b x , the horizontal coordinate value range, vertical coordinate value range of each straight line segment and the linear regression equation y=a+b of the straight line segment x Record and list them in an EXCEL table, and calculate the minimum protection width based on the EXCEL table .

[0010] The above calculation method of improving the accuracy of lightning protection by the broken line method for the protection range between two equal-height lightning rods is to divide the curve in the specification into a plurality of straight line segments, each of which forms a univariate linear regression equation. According to the horizontal coordinate χ=D / (h a P) calculation value, the vertical coordinate y=b can be accurately calculated x / (h a P) value, and then the minimum protection width b can be accurately calculated x ; The calculation method proposed in the present invention requires writing each univariate linear regression equation into an EXCEL table in advance to establish a database, which can greatly improve the accuracy and efficiency of the calculation; The application of the present invention can ensure the uniqueness of the calculation results and effectively avoid the situation where different calculation results are caused by deviations in values ​​taken by different people during calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 The minimum width of one side of the protection range between two lightning rods of equal height in the present invention With D / ( P) relationship curve diagram; Figure 2 In the embodiment of the present invention / The minimum width of one side of the protection range between lightning rods when h=0 With D / ( P) relationship curve diagram. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following content will systematically and completely describe the specific technical solutions of the present invention in combination with the drawings provided according to the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in 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.

[0013] A calculation method for improving the accuracy of broken line method lightning protection, the method comprising: The minimum width of one side of the protection range between two lightning rods of equal height With D / ( Each curve in the relationship curve of P) is divided into multiple straight line segments. Each straight line segment takes values ​​according to the horizontal and vertical coordinates of the first and last points, and the linear regression equation y=a+b of the straight line segment is obtained. x , then according to D / ( P) Calculated value is substituted into x , and then find the y value, / ( P) value, and ( P) value is known, and finally the minimum protection width can be calculated .

[0014] The minimum width of one side of the protection range between two lightning rods of equal height is With D / ( When each curve in the relationship curve of P) is divided into multiple straight line segments, the multiple straight line segments have the minimum width With D / ( There are many types of horizontal axis intervals on the relationship curve of P).

[0015] The minimum width of one side of the protection range between two lightning rods of equal height is With D / ( When each curve in the relationship curve of P) is divided into multiple straight line segments, the multiple straight line segments have the minimum width With D / ( P) is divided into two types of horizontal coordinate intervals, and the horizontal coordinate intervals of the straight line segments are from large to small according to the horizontal coordinates from small to large.

[0016] The minimum width of one side of the protection range between two lightning rods of equal height is With D / ( When each curve in the relationship curve of P) is divided into multiple straight line segments, the multiple straight line segments have the minimum width With D / ( There are two types of horizontal coordinate intervals on the relationship curve of P. As the horizontal coordinate increases, the horizontal coordinate interval of the first multiple straight line segments is 1, and the horizontal coordinate interval of the latter multiple straight line segments is 0.2.

[0017] The linear regression equation y=a+b obtained for each straight line segment obtained above x , then each straight line segment can know its two endpoints of the horizontal coordinate, the two endpoints of the vertical coordinate, and the linear regression equation of the straight line segment y=a+b x , the horizontal coordinate value range, vertical coordinate value range of each straight line segment and the linear regression equation y=a+b of the straight line segment x Record and list them in an EXCEL table, and calculate the minimum protection width based on the EXCEL table .

[0018] Example: The technical solutions adopted are: 1. The case of h=0 illustrates the calculation method proposed in this patent, see the attached Figure 1 , The calculation method is similar when / h is other values.

[0019] 2. In the attached Figure 1 curve / h=0, take D / ( P) is x axis, / ( P) is the y-axis, when x =0, y=1.6, when x =1, y=1.51, connecting the two points to get line segment 1, line segment 1 is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to deduce that the linear regression equation of line segment 1 is y=1.6-0.09 x .

[0020] 3. In the attached Figure 1 curve / h=0, when x =1, y=1.51, when x =2, y=1.39, connecting the two points to get line segment 2, line segment 2 is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to deduce that the linear regression equation of line segment 2 is y=1.63-0.12 x .

[0021] 4. In the attached Figure 1 curve / h=0, when x =2, y=1.39, when x =3, y=1.22, connecting the two points to get line segment 3, line segment 3 is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to deduce that the linear regression equation of line segment 3 is y=1.73-0.17 x .

[0022] 5. In the attached Figure 1 curve / h=0, when x =3, y=1.22, when x =4, y=1.02, connecting the two points to get line segment 4, line segment 4 is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to deduce that the linear regression equation of line segment 4 is y=1.82-0.2 x .

[0023] 6. In the attached Figure 1 curve / h=0, when x =4, y=1.02, when x=5, y=0.76, connecting the two points to get line segment 5, which is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to deduce that the linear regression equation of line segment 5 is y=2.06-0.26 x .

[0024] 7. In the attached Figure 1 curve / h=0, when x =5, y=0.76, when x =5.2, y=0.7, connecting the two points to get line segment 6, line segment 6 is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to deduce that the linear regression equation of line segment 6 is y=2.26-0.3 x .

[0025] 8. In the attached Figure 1 curve / h=0, when x =5.2, y=0.7, when χ=5.4, y=0.63, connect these two points to get line segment 7, line segment 7 is the linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to derive that the linear regression equation of line segment 7 is y=2.52-0.35 x .

[0026] 9. In the attached Figure 1 curve / h=0, when x =5.4, y=0.63, when x =5.6, y=0.58, connecting the two points to get line segment 8, line segment 8 is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to derive that the linear regression equation of line segment 8 is y=1.98-0.25 x .

[0027] 10. In the attached Figure 1 curve / h=0, when x =5.6, y=0.58, when x =5.8, y=0.5, connecting the two points to get line segment 9, which is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to deduce that the linear regression equation of line segment 9 is y=2.82-0.4 x .

[0028] 11. In the attached Figure 1 curve / h=0, whenx =5.8, y=0.5, when x =6.0, y=0.43, connecting the two points to get line segment 10, line segment 10 is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to derive that the linear regression equation for line segment 10 is y=2.53-0.35 x .

[0029] 12. In the attached Figure 1 curve / h=0, when x =6.0, y=0.43, when x =6.2, y=0.36, connecting the two points to get line segment 11, line segment 11 is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to derive that the linear regression equation of line segment 11 is y=2.53-0.35 x .

[0030] 13. In the attached Figure 1 curve / h=0, when x =6.2, y=0.36, when x =6.4, y=0.28, connecting the two points to get line segment 12, line segment 12 is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to derive that the linear regression equation for line segment 12 is y=2.84-0.4 x .

[0031] 14. In the attached Figure 1 curve / h=0, when x =6.4, y=0.28, when x =6.6, y=0.19, connecting the two points to get line segment 13, line segment 13 is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to derive that the linear regression equation of line segment 13 is y=3.16-0.45 x .

[0032] 15. In the attached Figure 1 curve / h=0, when x =6.6, y=0.19, when x =6.8, y=0.1, connecting the two points to get line segment 14, line segment 14 is the univariate linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to derive that the linear regression equation of line segment 14 is y=3.16-0.45x .

[0033] 16. In the attached Figure 1 curve / h=0, when x =6.8, y=0.1, when x =7.0, y=0, connecting the two points to get line segment 15, which is the linear regression equation y=a+b x Using the coordinate values ​​of these two points, it is easy to deduce that the linear regression equation of line segment 15 is y=3.5-0.5 x .

[0034] 17. According to the above analysis, the curve / When h = 0, the horizontal axis x = D / ( P) and the ordinate y= / ( P) is shown in the following table, and the curves formed by the various line segments are shown in the attached Figure 2 .

[0035]

[0036] 18. According to D / ( P) The calculated value size matches the univariate linear regression equation corresponding to different line segments, according to x Find the value of y, because ( P) value is known, and then find value.

[0037] 19. Similarly, according to the above method, we can get the data tables when the curves hx / h=0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9.

Claims

1. A calculation method for improving the accuracy of broken line lightning protection, characterized in that: Methods include: The minimum width of one side of the protection range between two lightning rods of equal height With D / ( Each curve in the relationship curve of P) is divided into multiple straight line segments. Each straight line segment takes values ​​according to the horizontal and vertical coordinates of the first and last points, and the linear regression equation y=a+b of the straight line segment is obtained. x , then according to D / ( P) Calculate and substitute x , and then find the y value, / ( P) value, and ( P) value is known, and finally the minimum protection width can be calculated .

2. According to the calculation method for improving the accuracy of the broken line method lightning protection as described in claim 1, it is characterized in that: The minimum width of one side of the protection range between two equal height lightning rods With D / ( When each curve in the relationship curve of P) is divided into multiple straight line segments, the multiple straight line segments have the minimum width With D / ( There are many types of horizontal axis intervals on the relationship curve of P).

3. According to the calculation method for improving the accuracy of the broken line method lightning protection as described in claim 2, it is characterized in that: The minimum width of one side of the protection range between two equal height lightning rods With D / ( When each curve in the relationship curve of P) is divided into multiple straight line segments, the multiple straight line segments have the minimum width With D / ( P) is divided into two types of horizontal coordinate intervals, and the horizontal coordinate intervals of the straight line segments are from large to small according to the horizontal coordinates from small to large.

4. According to the calculation method for improving the accuracy of the broken line method lightning protection as described in claim 3, it is characterized in that: The minimum width of one side of the protection range between two equal height lightning rods With D / ( When each curve in the relationship curve of P) is divided into multiple straight line segments, the multiple straight line segments have the minimum width With D / ( There are two types of horizontal coordinate intervals on the relationship curve of P. As the horizontal coordinate increases, the horizontal coordinate interval of the first multiple straight line segments is 1, and the horizontal coordinate interval of the latter multiple straight line segments is 0.

2.

5. A calculation method for improving the accuracy of lightning protection using the broken line method according to claim 3, characterized in that: The linear regression equation y=a+b obtained for each straight line segment is x , then each straight line segment can know its two endpoints of the horizontal coordinate, the two endpoints of the vertical coordinate, and the linear regression equation of the straight line segment y=a+b x , the horizontal coordinate value range, vertical coordinate value range of each straight line segment and the linear regression equation y=a+b of the straight line segment x Record and list them in an EXCEL table, and calculate the minimum protection width based on the EXCEL table .

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