Calculation method and system for measuring sag at multiple measuring points of ground wire of power transmission line

Abstract

The embodiment of the invention provides a calculation method and system for measuring sags at multiple measuring points of a ground wire of a power transmission line, and belongs to the field of ground wire measurement of the power transmission line. The calculation method comprises the following steps: acquiring a standard parabola model equation of a ground wire; calculating a standard line selection coefficient and a standard sag value of the ground wire according to the standard parabola model equation; calculating three actual measurement intervals of the ground wire according to the standard line selection coefficient; all measuring points, located in the three actual measurement intervals, on the ground wire are obtained; a measuring point is selected from each of the three actual measurement intervals, and every three measuring points form a sag measuring group for full-connection combination; and calculating an average sag value and a weighted sag value of the grounding wire according to the measuring point coordinates of the grouped sag measuring groups. According to the calculation method, the sag of the ground wire can be calculated through the multiple measuring points of the ground wire, so that the sag of the ground wire can be measured more accurately, and the whole ground wire can be evaluated.

Description

Technical Field

[0001] The present invention relates to the field of transmission line conductor and ground wire measurement, and specifically to a calculation method and system for the sag of multiple measurement points of transmission line conductors and ground wires. Background Art

[0002] During the construction and acceptance of overhead transmission lines, the sag of conductors and ground wires is an important indicator, which directly affects the safe and stable operation of transmission lines. Traditional sag measurement methods are often troubled by problems such as terrain limitations, cumbersome operations, and large errors. Especially in complex terrains and inaccessible areas, traditional measurement methods are often difficult to implement, and the measurement accuracy is difficult to guarantee. Therefore, seeking a new sag measurement method has become an urgent problem to be solved in the high-voltage transmission industry.

[0003] In recent years, the development of unmanned aerial vehicle (UAV) technology has brought new possibilities to the measurement of overhead lines. UAVs have the advantages of strong flexibility, controllable flight height and path, and can easily reach complex terrains and inaccessible areas for measurement. The real-time kinematic (RTK) carrier phase differential technology has been widely used in the surveying and mapping field with its high-precision positioning ability.

[0004] Through the RTK UAV measurement technology, the high-precision position information of the conductor and ground wire can be obtained in real time, and the measurement device is carried to complete the curve fitting calculation of the conductor sag task by the built-in algorithm in real time, so as to realize the efficient and accurate measurement of the conductor and ground wire sag. This not only overcomes the influence of factors such as environmental limitations, but also improves the measurement efficiency and sag measurement accuracy, and has great potential and advantages.

[0005] On the basis of the theoretical calculation of the sag using three measurement points at both ends and in the middle of the conductor and ground wire, it is necessary to further improve the accuracy and stability of the sag measurement. By further dividing the measured interval, increasing the number of selected measurement points, and calculating the average sag value and weighted sag value, the accuracy and stability of the sag measurement can be effectively improved. Therefore, a calculation method for the sag of multiple measurement points of the conductor and ground wire is needed. Summary of the Invention

[0006] The purpose of the embodiments of the present invention is to provide a calculation method and system for the sag of multiple measurement points of transmission line conductors and ground wires. This calculation method can calculate the sag of the conductor and ground wire through multiple measurement points of the conductor and ground wire, so as to measure the sag of the conductor and ground wire more accurately and evaluate the whole conductor and ground wire.

[0007] To achieve the above purpose, the embodiments of the present invention provide a calculation method for the sag of multiple measurement points of transmission line conductors and ground wires, and the calculation method includes:

[0008] Obtain the standard parabola model equation of the conductor and ground wire;

[0009] Calculate the standard line selection coefficient and the standard sag value of the ground wire according to the standard parabola model equation;

[0010] Calculate three measured intervals of the ground wire according to the standard line selection coefficient;

[0011] Obtain all the measuring points on the ground wire within the three measured intervals;

[0012] Select one measuring point within each of the three measured intervals, and every three measuring points form a sag measurement group for full connection combination for grouping;

[0013] Obtain the measuring point coordinates of each sag measurement group, and calculate the average sag value and the weighted sag value of the ground wire according to the measuring point coordinates of the grouped sag measurement groups.

[0014] Optionally, obtaining the standard parabola model equation of the ground wire includes:

[0015] Obtain the standard parabola model equation according to formula (1):

[0016] z = k b x 2 -k b lx + tanβ·x, formula (1)

[0017] Wherein, z represents the height coordinate of the point on the ground wire, x represents the horizontal coordinate of the point on the ground wire, k b represents the standard line selection coefficient, β represents the elevation angle, and l represents the horizontal distance between the two end points of the ground wire.

[0018] Optionally, calculating the standard line selection coefficient and the standard sag value of the ground wire according to the standard parabola model equation includes:

[0019] Obtain the coordinates of the left end point, the right end point and the lowest point of the ground wire;

[0020] Calculate the horizontal distances between the left end point and the lowest point and between the left end point and the right end point of the ground wire according to formula (2):

[0021]

[0022] Wherein, ΔL1 represents the horizontal distance between the left end point and the lowest point of the ground wire, represents the horizontal coordinate of the lowest point of the ground wire, represents the horizontal coordinate of the left end point of the ground wire, ΔL1 represents the horizontal distance between the left end point and the right end point of the ground wire, represents the horizontal coordinate of the right end point of the ground wire;

[0023] Obtain the standard line selection coefficient of the ground wire according to formula (3):

[0024]

[0025] wherein, represents the height coordinate of the left end point of the ground wire, represents the height coordinate of the lowest point of the ground wire, represents the height coordinate of the right end point of the ground wire.

[0026] Optionally, calculate the standard line selection coefficient and the standard sag value of the ground wire according to the standard parabola model equation, including:

[0027] Obtain the standard sag value of the ground wire through formula (4):

[0028]

[0029] wherein, f b represents the standard sag value of the ground wire.

[0030] Optionally, calculate three measured intervals of the ground wire according to the standard line selection coefficient, including:

[0031] Perform numerical discretization on the points on the standard parabola model and obtain the coordinates of multiple discrete points;

[0032] Select points and the lowest point one by one from both ends of the parabola model towards the middle, and take the three discrete points selected each time as a group to obtain multiple grouped discrete points, and calculate and analyze the k value and the sag amplitude change of each group;

[0033] Obtain the line selection coefficient of the discrete points of each group according to formula (3);

[0034] Calculate the line selection coefficient accuracy of the discrete points of each group according to formula (5):

[0035] Δk = |k' - k b |, formula (5)

[0036] wherein, Δk represents the line selection coefficient accuracy of the discrete points of each group, and k' represents the line selection coefficient of the discrete points of each group;

[0037] Obtain three measured intervals of the ground wire according to the line selection coefficient accuracy of the discrete points of each group obtained.

[0038] Optionally, obtain three measured intervals of the ground wire according to the line selection coefficient accuracy of the discrete points of each group obtained, including:

[0039] Screen multiple groups of minimum accuracy discrete points with line selection coefficient accuracy less than the preset threshold;

[0040] Obtain the clustering centers of three discrete points based on multiple groups of minimum-precision discrete points;

[0041] Obtain the minimum horizontal spacing based on the clustering centers of the three discrete points;

[0042] Perform length division of the measured interval according to the minimum horizontal spacing;

[0043] Obtain three measured intervals of the ground wire according to the division lengths of the length division of the measured interval.

[0044] Optionally, performing length division of the measured interval according to the minimum horizontal spacing includes:

[0045] Perform division of the measured interval through formula (6):

[0046]

[0047] where τ represents the number of divisions of the measured interval, and Δτ min represents the minimum horizontal spacing.

[0048] Optionally, obtaining the three measured intervals of the ground wire according to the division lengths obtained from the length division of the measured interval includes:

[0049] Take the clustering center of the middle discrete point as the middle value of the middle measured interval, and obtain the first interval according to the division length of the measured interval;

[0050] According to the obtained division length, starting from the endpoints at both ends of the obtained ground wire, divide the interval towards the middle to obtain the fourth interval and the fifth interval. The ground wire columns in the first interval and the fourth interval are the second interval, and the ground wire columns in the first interval and the fifth interval are the third interval, and use Roman numerals I - V as the identifiers for dividing the measured intervals;

[0051] Take the first interval, the fourth interval, and the fifth interval as the three measured intervals of the ground wire.

[0052] Optionally, obtaining the measuring point coordinates of each sag measurement group and calculating the average sag value and weighted sag value of the ground wire according to the measuring point coordinates of the grouped sag measurement groups includes:

[0053] Obtain the measuring point coordinates of each measuring point in each sag measurement group, and obtain the horizontal spacing of the three measuring points in the sag measurement group according to the measuring point coordinates of each sag measurement group;

[0054] Obtain the line selection coefficient of each sag measurement group according to formula (7):

[0055]

[0056] Among them, i represents the parameter label of the sag measurement group, z i1 represents the height coordinate of the measurement point at the left end of the sag measurement group of the i-th group, z i2 represents the height coordinate of the measurement point at the middle end of the sag measurement group of the i-th group, z i3 represents the height coordinate of the measurement point at the right end of the sag measurement group of the i-th group, ΔL i1 represents the horizontal distance between the measurement point at the left end and the measurement point in the middle section of the sag measurement group of the i-th group, ΔL i1 represents the horizontal distance between the measurement point at the left end and the measurement point at the right end of the sag measurement group of the i-th group, k i represents the line selection coefficient of the sag measurement group of the i-th group;

[0057] Obtain the sag value of each sag measurement group according to formula (8):

[0058]

[0059] Among them, f i represents the sag value of the sag measurement group of the i-th group.

[0060] Optionally, obtain the measurement point coordinates of each sag measurement group, and calculate the average sag value and weighted sag value of the overhead ground wire according to the measurement point coordinates of the grouped sag measurement groups, including:

[0061] Calculate the average sag value of the overhead ground wire according to formula (8):

[0062]

[0063] Among them, n IV *n I *n V represents the number of groups of the sag measurement group, n IV 、n I 、n V represent the number of measurement points in the first interval, the fourth interval and the fifth interval, represents the average sag value.

[0064] Optionally, obtain the measurement point coordinates of each sag measurement group, and calculate the average sag value and weighted sag value of the overhead ground wire according to the measurement point coordinates of the grouped sag measurement groups, including:

[0065] Obtain the sag value of each said sag measurement group;

[0066] Calculate the weight factor according to formula (9):

[0067]

[0068] Among them, κ i represents the weight factor of each group of sag measurement groups, K represents the adjustment coefficient, fb represents the standard sag value;

[0069] Calculate the weight according to formula (10):

[0070]

[0071] where, ω i represents the weight of each group of sag measurement groups;

[0072] Calculate the weighted sag value according to formula (11):

[0073]

[0074] where, f ω represents the weighted sag value.

[0075] On the other hand, the present invention also provides a calculation system for measuring the sag of the conductor and ground wire at multiple measurement points of a transmission line. The calculation system includes:

[0076] A conductor and ground wire sag measurement device for positioning and identifying the measurement points of the conductor and ground wire in the transmission line;

[0077] A background calculation module for receiving the information of the measurement points obtained by the conductor and ground wire sag measurement device to execute the calculation method for measuring the sag of the conductor and ground wire at multiple measurement points of the transmission line according to any one of claims 1-11.

[0078] On yet another aspect, the present invention also provides a computer-readable storage medium storing instructions for being read by a machine so that the machine executes the calculation method for measuring the sag of the conductor and ground wire at multiple measurement points of the transmission line as described above.

[0079] Through the above technical solutions, the calculation method and system for measuring the sag of transmission line conductors and ground wires with multiple measurement points provided by the present invention obtain the standard parabola model equation of the conductor and ground wire, and then the standard line selection coefficient and standard sag value of the conductor and ground wire can be calculated according to the standard parabola model equation. The three actual measurement intervals of the conductor and ground wire can be calculated according to the standard line selection coefficient. After obtaining the three actual measurement intervals, all the measurement points on the conductor and ground wire within the three actual measurement intervals can be obtained. One measurement point is selected within each of the three actual measurement intervals, and then every three measurement points are combined into a sag measurement group for full connection combination, so that multiple groups can be obtained. After obtaining the groups, the coordinate of the measurement point of each sag measurement group can be obtained, and then the average sag value and weighted sag value of the conductor and ground wire can be calculated according to the coordinates of the measurement points of the grouped sag measurement groups. Thus, the situation of the conductor and ground wire can be evaluated as a whole according to the average sag value, and the sag of the conductor and ground wire can be measured precisely according to the weighted sag value. This calculation method can calculate the sag of the conductor and ground wire through multiple measurement points of the conductor and ground wire, so as to measure the sag of the conductor and ground wire more accurately and evaluate the whole conductor and ground wire.

[0080] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification. They are used together with the following specific implementation to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0082] Figure 1 is a flowchart of a calculation method for measuring the sag of transmission line conductors and ground wires with multiple measurement points according to an embodiment of the present invention;

[0083] Figure 2 is a flowchart of obtaining the standard line selection coefficient and standard sag value of a calculation method for measuring the sag of transmission line conductors and ground wires with multiple measurement points according to an embodiment of the present invention;

[0084] Figure 3 is a first flowchart of obtaining three actual measurement intervals of a calculation method for measuring the sag of transmission line conductors and ground wires with multiple measurement points according to an embodiment of the present invention;

[0085] Figure 4 is a second flowchart of obtaining three actual measurement intervals of a calculation method for measuring the sag of transmission line conductors and ground wires with multiple measurement points according to an embodiment of the present invention;

[0086] Figure 5 is a third flowchart of obtaining three actual measurement intervals of a calculation method for measuring the sag of transmission line conductors and ground wires with multiple measurement points according to an embodiment of the present invention;

[0087] Figure 6 It is a flowchart for obtaining the sag value of the calculation method for multi-point measurement of the sag of transmission line conductors and ground wires according to an embodiment of the present invention;

[0088] Figure 7 It is a flowchart for obtaining the weighted sag value of the calculation method for multi-point measurement of the sag of transmission line conductors and ground wires according to an embodiment of the present invention;

[0089] Figure 8 It is a schematic diagram of conductors and ground wires according to an embodiment of the present invention;

[0090] Figure 9 It is a schematic diagram of the discretization of conductors and ground wires according to an embodiment of the present invention;

[0091] Figure 10 It is a schematic diagram of three actually measured intervals according to an embodiment of the present invention;

[0092] Figure 11 It is a schematic diagram of the full connection combination of the measurement points in three actually measured intervals according to an embodiment of the present invention. Specific embodiments

[0093] The following will describe in detail the specific embodiments of the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0094] Figure 1 It is a flowchart of the calculation method for multi-point measurement of the sag of transmission line conductors and ground wires according to an embodiment of the present invention. In the present invention, the process of this calculation method may include:

[0095] In step S1, obtain the standard parabola model equation of the conductor and ground wire.

[0096] In step S2, calculate the standard line selection coefficient and the standard sag value of the conductor and ground wire according to the standard parabola model equation.

[0097] In step S3, calculate three actually measured intervals of the conductor and ground wire according to the standard line selection coefficient.

[0098] In step S4, obtain all the measurement points on the conductor and ground wire located within the three actually measured intervals.

[0099] In step S5, select one measurement point in each of the three actually measured intervals, and form a sag measurement group with every three measurement points for full connection combination for grouping.

[0100] In step S6, the measuring point coordinates of each sag measurement group are obtained, and the average sag value and weighted sag value of the conductor and ground wire are calculated based on the measuring point coordinates of the grouped sag measurement groups.

[0101] In the present invention, when calculating the sag of the conductor and ground wire, the standard parabola model equation of the conductor and ground wire can be obtained first, and then the standard line selection coefficient and standard sag value of the conductor and ground wire can be calculated according to the standard parabola equation. After obtaining the standard line selection coefficient, the three measured intervals of the conductor and ground wire can be calculated according to the standard line selection coefficient. The approximate ranges of the three measured intervals can be in the middle section, left section, and right section of the conductor and ground wire. After dividing to obtain the three measured intervals, all the measuring points on the conductor and ground wire located within the three measured intervals can be obtained. After obtaining the measuring points, one measuring point can be taken within each measured interval, and then every three measuring points can form a sag measurement group for full connection combination. The number of groups can be n IV ×n I ×n V ,n IV 、n I 、n V which can represent the number of measuring points respectively located in the three measurement areas of IV, I, and V. The full connection combination can be as Figure 11 shown. After grouping, the measuring point coordinates of each sag measurement group can be obtained, and the average sag value and weighted sag value of the conductor and ground wire can be calculated according to the measuring point coordinates of the grouped sag measurement groups. Thus, the situation of the conductor and ground wire can be evaluated as a whole according to the average sag value, and the sag of the conductor and ground wire can be measured precisely according to the weighted sag value. This calculation method can calculate the sag of the conductor and ground wire through multiple measuring points of the conductor and ground wire, so as to measure the sag of the conductor and ground wire more accurately and evaluate the whole of the conductor and ground wire.

[0102] In an embodiment of the present invention, the standard parabola model equation can be obtained according to the formula (1):

[0103] z = k b x 2 -k b lx + tanβ·x, formula (1)

[0104] where z represents the height coordinate of the point on the conductor and ground wire, x represents the horizontal coordinate of the point on the conductor and ground wire, k b represents the standard line selection coefficient, β represents the elevation angle, and l represents the horizontal distance between the two end points of the conductor and ground wire.

[0105] The formula (1) can represent the standard model of the conductor and ground wire, and then according to the actual situation of the conductor and ground wire, the line selection coefficient of the conductor and ground wire can be adjusted, so that the model can better conform to the actual situation of the conductor and ground wire.

[0106] In one embodiment of the present invention, as Figure 2 shown, the process of obtaining the standard line selection coefficient and the standard sag value may include:

[0107] In step S7, obtain the coordinates of the left end point, right end point, and lowest point of the conductor and ground wire.

[0108] In step S8, calculate the horizontal distances between the left end point of the conductor and ground wire and the lowest point, and between the left end point and the right end point according to formula (2):

[0109]

[0110] Among them, ΔL1 represents the horizontal distance between the left end point of the conductor and ground wire and the lowest point, represents the horizontal coordinate of the lowest point of the conductor and ground wire, represents the horizontal coordinate of the left end point of the conductor and ground wire, and ΔL2 represents the horizontal distance between the left end point and the right end point of the conductor and ground wire, represents the horizontal coordinate of the right end point of the conductor and ground wire.

[0111] In step S9, obtain the standard line selection coefficient of the conductor and ground wire according to formula (3):

[0112]

[0113] Among them, represents the height coordinate of the left end point of the conductor and ground wire, represents the height coordinate of the lowest point of the conductor and ground wire, represents the height coordinate of the right end point of the conductor and ground wire.

[0114] In the present invention, when calculating the standard parabolic model equation of the conductor and ground wire, the coordinates of the left end point, right end point, and lowest point of the conductor and ground wire can be obtained first. As Figure 8 shown, the three points may be the left end point the lowest point of the conductor and ground wire the right end point of the conductor and ground wire After obtaining the coordinates, the horizontal distance between the left end point of the conductor and ground wire and the lowest point, and the horizontal distance between the left end point and the right end point can be calculated according to formula (2). After obtaining the horizontal distances between the left end point of the conductor and ground wire and the lowest point, and between the left end point and the right end point, the standard line selection coefficient of the conductor and ground wire can be obtained according to formula (3). According to the standard line selection coefficient, the standard parabolic model equation of the conductor can be constructed.

[0115] In one embodiment of the present invention, when calculating the standard line selection coefficient and the standard sag value of the conductor and ground wire according to the standard parabolic model equation, after obtaining the standard line selection coefficient, the standard sag value of the conductor and ground wire can be calculated and obtained according to formula (4):

[0116]

[0117] Among them, f b represents the standard sag value of the ground wire.

[0118] In an embodiment of the present invention, as Figure 3 shown, the first process of obtaining three measured intervals may include:

[0119] In step S10, numerical discretization processing is performed on the points on the standard parabola model, and the coordinates of multiple discrete points are obtained.

[0120] In step S11, points and the lowest point are taken one by one from both ends of the parabola model towards the middle, and every three discrete points selected each time are used as a group to obtain multiple grouped discrete points, and the k value and the sag amplitude change of each group are analyzed by calculation.

[0121] In step S12, the line selection coefficient of the discrete points of each group is obtained according to formula (3).

[0122] In step S13, the accuracy of the line selection coefficient of the discrete points of each group is calculated according to formula (5):

[0123] Δk = |k' - k b |, formula (5)

[0124] Among them, Δk represents the accuracy of the line selection coefficient of the discrete points of each group, and k' represents the line selection coefficient of the discrete points of each group.

[0125] In step S14, three measured intervals of the ground wire are obtained according to the accuracy of the line selection coefficient of the discrete points of each group obtained.

[0126] In the present invention, when obtaining three measured intervals of the ground wire that need to be calculated, numerical discretization processing can be performed on the points on the standard parabola model, as Figure 9As shown, the coordinates of multiple discrete points can be obtained. After obtaining the coordinates, points can be taken one by one from both ends of the parabolic model towards the middle to obtain points near both ends, or the lowest point can be taken, and the three selected discrete points can be taken as a group. Multiple groups of discrete points can be obtained according to this method. By calculation, the k-value of each group and the change of the sag amplitude can be analyzed. Subsequently, appropriate discrete points can be selected according to the k-value of each group and the change of the sag amplitude to calculate the horizontal spacing. After obtaining multiple groups of discrete points, the coordinates of the multiple groups of discrete points are substituted into formula (3), and the coordinates of the discrete points are replaced with the coordinates of the left end point, right end point, and lowest point in formula (3), so that the line selection coefficient of each group of discrete points can be obtained. After obtaining the line selection coefficient of each group of discrete points, the line selection coefficient accuracy of each group of discrete points can be calculated according to formula (5). After obtaining the line selection coefficient accuracy, three measured intervals of the conductor and ground wire can be obtained according to the line selection coefficient accuracy of each group obtained.

[0127] In an embodiment of the present invention, as Figure 4 shown, the second process of obtaining the three measured intervals may include:

[0128] In step S15, multiple groups of minimum-precision discrete points with a line selection coefficient accuracy less than a preset threshold are screened.

[0129] In step S16, three discrete point clustering centers are obtained according to the multiple groups of minimum-precision discrete points.

[0130] In step S17, the minimum horizontal spacing is obtained according to the three discrete point clustering centers.

[0131] In step S18, the length of the measured interval is divided according to the minimum horizontal spacing.

[0132] In step S19, the three measured intervals of the conductor and ground wire are obtained according to the division length of the length of the measured interval.

[0133] In the present invention, after obtaining the line selection coefficient accuracy of each group of discrete points, multiple groups of minimum-precision discrete points with a line selection coefficient accuracy less than a preset threshold can be screened. After obtaining multiple groups of minimum-precision discrete points, three discrete point clustering centers can be obtained according to the multiple groups of minimum-precision discrete points, and then the minimum horizontal spacing can be obtained according to the three discrete point clustering centers. When selecting the middle clustering center, when the discrete points selected in each group are all the lowest points, the middle clustering center can be the lowest point. After obtaining the minimum horizontal spacing, the length of the measured interval can be divided according to the minimum horizontal spacing, and then the three measured intervals of the conductor and ground wire can be obtained according to the division length of the length of the measured interval.

[0134] In one embodiment of the present invention, when obtaining the division length of the measured interval according to the minimum horizontal spacing, the division length of the measured interval can be obtained according to the formula (6):

[0135]

[0136] where τ represents the number of divisions of the measured interval, and Δτ min represents the minimum horizontal spacing. The minimum horizontal spacing can be the division length of the measured interval.

[0137] In one embodiment of the present invention, as Figure 5 shown, the third process of obtaining three measured intervals may include:

[0138] In step S20, the clustering center of the middle discrete points is used as the middle value of the middle measured interval, and the first interval is obtained according to the division length of the measured interval.

[0139] In step S21, according to the obtained division length, starting from the end points at both ends of the obtained ground wire, the interval is divided towards the middle to obtain the fourth interval and the fifth interval. The ground wire columns in the first interval and the fourth interval are the second interval, and the ground wire columns in the first interval and the fifth interval are the third interval, and Roman numerals I - V are used as the identifiers for dividing the measured intervals.

[0140] In step S22, the first interval, the fourth interval, and the fifth interval are used as the three measured intervals of the ground wire.

[0141] In the present invention, when obtaining the three measured intervals of the ground wire, the clustering center of the middle discrete points can be used as the middle value of the middle measured interval, and then the first interval can be obtained according to the division length of the measured interval, that is, the clustering center of the middle discrete points is used as the middle value, and then it extends horizontally to the left and right by half of the division length to be used as the first interval. After obtaining the division length of the measured interval and the first interval, according to the division length of the measured interval and the first interval. After dividing the first interval, according to the actual situation of the measured points, the leftmost measured point and the rightmost measured point of the obtained measured points can be used as the end points, and the interval is divided towards the middle at a distance of the division length, so as to obtain the fourth interval and the fifth interval. After obtaining the fourth interval and the fifth interval, the ground wire in the first interval and the fourth interval can be regarded as the second interval. The ground wire in the first interval and the fifth interval can be regarded as the third interval, and Roman numerals I - V can be used as the identifiers for dividing the measured intervals, as Figure 10 shown. After dividing the measured intervals, the first interval, the fourth interval, and the fifth interval can be used as the three measured intervals of the ground wire. When calculating the sag of the ground wire subsequently, the measured points can be obtained from these three measured intervals and then the sag can be calculated.

[0142] In an embodiment of the present invention, as Figure 6 shown, the process of obtaining the sag value may include:

[0143] In step S23, the coordinates of each measurement point within each sag measurement group are obtained, and the horizontal spacing between three measurement points within the sag measurement group is obtained based on the coordinates of the measurement points of each sag measurement group.

[0144] In step S24, the line selection coefficient of each sag measurement group is obtained according to formula (7):

[0145]

[0146] where i represents the parameter label of the sag measurement group, z i1 represents the height coordinate of the measurement point at the left end of the i-th sag measurement group, z i2 represents the height coordinate of the measurement point at the middle end of the i-th sag measurement group, z i3 represents the height coordinate of the measurement point at the right end of the i-th sag measurement group, ΔL i1 represents the horizontal spacing between the measurement point at the left end and the measurement point in the middle section of the i-th sag measurement group, ΔL i1 represents the horizontal spacing between the measurement point at the left end and the measurement point at the right end of the i-th sag measurement group, k i represents the line selection coefficient of the i-th sag measurement group.

[0147] In step S25, the sag value of each sag measurement group is obtained according to formula (8):

[0148]

[0149] where f i represents the sag value of the i-th sag measurement group.

[0150] In the present invention, when obtaining the average sag value of the conductor and ground wire, it is necessary to obtain the sag of each sag measurement group before calculating the average sag value. When obtaining the sag of each sag measurement group, the coordinates of each measurement point within each sag measurement group can be obtained first, and the horizontal spacing between three measurement points within the sag measurement group can be obtained based on the coordinates of the measurement points of each sag measurement group. After obtaining the horizontal spacing, the line selection coefficient of each sag measurement group can be obtained according to this formula (7). According to the obtained line selection coefficient of each sag measurement group, the sag value of each sag measurement group can be obtained through formula (8).

[0151] In an embodiment of the present invention, after obtaining the sag value of each sag measurement group, the average sag value is calculated based on the obtained sag value. When calculating the average sag value, the average sag value of the conductor and ground wire can be calculated according to formula (8):

[0152]

[0153] Among them, n IV *n I *n V represents the number of groups of sag measurement groups, and n IV , n I , n V represent the number of measurement points located in the first interval, the fourth interval, and the fifth interval, and f i represents the average sag value.

[0154] In an embodiment of the present invention, as Figure 7 shown, the process of obtaining the weighted sag value may include:

[0155] In step S26, obtain the sag value of each sag measurement group.

[0156] In step S27, calculate the weight factor according to formula (9):

[0157]

[0158] Among them, κ i represents the weight factor of each sag measurement group, K represents the adjustment coefficient, and f b represents the standard sag value.

[0159] In step S28, calculate the weight according to formula (10):

[0160]

[0161] Among them, ω i represents the weight of each sag measurement group.

[0162] In step S29, calculate the weighted sag value according to formula (11):

[0163]

[0164] Among them, f ω represents the weighted sag value.

[0165] In the present invention, after obtaining the sag value of each sag measurement group, the weight factor can be calculated according to formula (9). After obtaining the weight factor, the weight can be calculated according to formula (10). According to the calculated weight, the weighted sag value can be calculated through formula (11).

[0166] On the other hand, the present invention also provides a calculation system for measuring the sag of a transmission line's ground wire at multiple measurement points. The calculation system includes: a ground wire sag measurement device and a background calculation module. The ground wire sag measurement device is used to locate and identify the measurement points of the ground wire in the transmission line. The background calculation module is used to receive the information of the measurement points obtained by the ground wire sag measurement device to execute the calculation method for measuring the sag of the transmission line's ground wire at multiple measurement points as described above.

[0167] In yet another aspect, the present invention also provides a computer-readable storage medium storing instructions that are used to be read by a machine so that the machine executes the calculation method for measuring the sag of the transmission line's ground wire at multiple measurement points as described above.

[0168] Through the above technical solutions, the calculation method and system for measuring the sag of a transmission line's ground wire at multiple measurement points provided by the present invention obtain the standard parabola model equation of the ground wire, and then can calculate the standard line selection coefficient and the standard sag value of the ground wire according to this standard parabola model equation. According to this standard line selection coefficient, three measured intervals of the ground wire can be calculated. After obtaining the three measured intervals, all the measurement points on the ground wire within the three measured intervals can be obtained. One measurement point is selected within each of the three measured intervals, and then a sag measurement group is formed by every three measurement points for full connection combination, so that multiple groups can be obtained. After obtaining the groups, the coordinates of the measurement points of each sag measurement group can be obtained, and then the average sag value and the weighted sag value of the ground wire can be calculated according to the coordinates of the measurement points of the grouped sag measurement groups, so that the situation of the ground wire can be evaluated as a whole according to the average sag value, and the sag of the ground wire can be measured precisely according to the weighted sag value. This calculation method can calculate the sag of the ground wire through multiple measurement points of the ground wire to measure the sag of the ground wire more accurately and can evaluate the ground wire as a whole.

[0169] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0170] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, as well as the combination of flows and / or blocks in the flowchart and / or block diagram. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices produce means for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0171] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including instruction means that implement the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0172] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0173] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and a memory.

[0174] The memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of computer-readable media.

[0175] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0176] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0177] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A calculation method for measuring the sag of the conductor and ground wire of a transmission line at multiple measuring points, characterized in that, The calculation method includes: Obtain the standard parabolic model equation of the ground wire; Calculate the standard line selection coefficient and standard sag value of the ground wire according to the standard parabolic model equation; Calculate three measured intervals of the ground wire according to the standard line selection coefficient; Obtain all measurement points on the ground wire within the three measured intervals; Select one measurement point within each of the three measured intervals, and every three measurement points form a sag measurement group for full connection combination to perform grouping; Obtain the coordinates of the measurement points of each sag measurement group, and calculate the average sag value and weighted sag value of the ground wire according to the coordinates of the measurement points of the grouped sag measurement groups.

2. The calculation method according to claim 1, wherein Obtain the standard parabolic model equation of the ground wire, including: Obtain the standard parabolic model equation according to formula (1): z = k b x 2 -k b lx + tanβ·x, formula (1) where z represents the height coordinate of a point on the ground wire, x represents the horizontal coordinate of a point on the ground wire, k b represents the standard line selection coefficient, β represents the elevation angle, and l represents the horizontal distance between the two end points of the ground wire.

3. The calculation method according to claim 2, characterized in that, Calculate the standard line selection coefficient and standard sag value of the ground wire according to the standard parabolic model equation, including: Obtain the coordinates of the left end point, right end point and lowest point of the ground wire; Calculate the horizontal distances between the left end point and the lowest point and between the left end point and the right end point of the ground wire according to formula (2): Among them, ΔL1 represents the horizontal distance between the left end point of the ground wire and the lowest point. represents the horizontal coordinate of the lowest point of the ground wire. represents the horizontal coordinate of the left end point of the ground wire, and ΔL1 represents the horizontal distance between the left end point and the right end point of the ground wire. represents the horizontal coordinate of the right end point of the ground wire. Obtain the standard line selection coefficient of the ground wire according to formula (3): Among them, represents the height coordinate of the left endpoint of the ground wire, represents the height coordinate of the lowest point of the ground wire, represents the height coordinate of the right endpoint of the ground wire.

4. The calculation method according to claim 3, characterized in that Calculate the standard line selection coefficient and standard sag value of the ground wire according to the standard parabolic model equation, including: Obtain the standard sag value of the ground wire through formula (4): Among them, f b represents the standard sag value of the ground wire and overhead line conductor.

5. The calculation method according to claim 4, characterized in that, Calculate three measured intervals of the ground wire according to the standard line selection coefficient, including: Perform numerical discretization on the points on the standard parabolic model and obtain the coordinates of multiple discrete points; Select points and the lowest point one by one from both ends of the parabolic model towards the middle, and take every three selected discrete points as a group to obtain multiple grouped discrete points, and calculate and analyze the k value and sag amplitude change situation of each group; Obtain the line selection coefficient of the discrete points of each group according to formula (3); Calculate the line selection coefficient accuracy of the discrete points of each group according to formula (5): Δk = |k' - k b |, Equation (5) Wherein, Δk represents the line selection coefficient accuracy of the discrete points of each group, and k' represents the line selection coefficient of the discrete points of each group; Obtain three measured intervals of the ground wire according to the obtained line selection coefficient accuracy of the discrete points of each group.

6. The calculation method according to claim 5, characterized in that Obtain three measured intervals of the ground wire according to the obtained line selection coefficient accuracy of the discrete points of each group, including: Screen multiple groups of minimum accuracy discrete points with line selection coefficient accuracy less than the preset threshold; Obtain three discrete point clustering centers according to multiple groups of minimum accuracy discrete points; Obtain the minimum horizontal distance according to the three discrete point clustering centers; Perform length division of the measured intervals according to the minimum horizontal distance; Obtain three measured intervals of the ground wire according to the division length of the length division of the measured intervals.

7. The calculation method according to claim 6, wherein Perform length division of the measured intervals according to the minimum horizontal distance, including: Perform division of the measured intervals through formula (6): Among them, τ represents the number of divisions of the measured interval, and Δτ min represents the minimum horizontal spacing.

8. The calculation method according to claim 6, characterized in that, Obtain three measured intervals of the ground wire according to the division length obtained from the length division of the measured intervals, including: Take the middle discrete point clustering center as the middle value of the middle measured interval, and obtain the first interval according to the division length of the measured intervals; According to the obtained division length, starting from the endpoints at both ends of the obtained ground wire, divide the interval towards the middle to obtain a fourth interval and a fifth interval. The ground wire columns in the first interval and the fourth interval are the second interval, and the ground wire columns in the first interval and the fifth interval are the third interval. Roman numerals I-V are used as the identifiers for dividing the measured intervals. The first interval, the fourth interval, and the fifth interval are used as the three measured intervals of the ground wire.

9. The calculation method according to claim 1, wherein Obtain the measuring point coordinates of each sag measurement group, and calculate the average sag value and weighted sag value of the ground wire according to the measuring point coordinates of the grouped sag measurement groups, including: Obtain the measuring point coordinates of each measuring point in each sag measurement group, and obtain the horizontal spacing of the three measuring points in the sag measurement group according to the measuring point coordinates of each sag measurement group. Obtain the line selection coefficient of each sag measurement group according to formula (7): where \(i\) represents the parameter label of the sag measurement group, \(z\) i1 represents the height coordinate of the measurement point at the left end of the sag measurement group of the \(i\)-th group, \(z\) i2 represents the height coordinate of the measurement point at the middle end of the sag measurement group of the \(i\)-th group, \(z\) i3 represents the height coordinate of the measurement point at the right end of the sag measurement group of the \(i\)-th group, \(\Delta L\) i1 represents the horizontal distance between the measurement point at the left end and the measurement point in the middle section of the sag measurement group of the \(i\)-th group, \(\Delta L\) i1 represents the horizontal distance between the measurement point at the left end and the measurement point at the right end of the sag measurement group of the \(i\)-th group, \(k\) i represents the line selection coefficient of the sag measurement group of the \(i\)-th group; Obtain the sag value of each sag measurement group according to formula (8): Among them, f i represents the sag value of the sag measurement group of the i-th group.

10. The calculation method according to claim 9, characterized in that, Obtain the measuring point coordinates of each sag measurement group, and calculate the average sag value and weighted sag value of the ground wire according to the measuring point coordinates of the grouped sag measurement groups, including: Calculate the average sag value of the ground wire according to formula (8): Among them, n IV *n I *n V represents the number of groups of sag measurement groups, and n IV , n I , n V represent the number of measurement points located in the first interval, the fourth interval, and the fifth interval. represents the average sag value.

11. The calculation method according to claim 10, characterized in that, Obtain the measuring point coordinates of each sag measurement group, and calculate the average sag value and weighted sag value of the ground wire according to the measuring point coordinates of the grouped sag measurement groups, including: Obtain the sag value of each of the sag measurement groups; Calculate the weight factor according to formula (9): Among them, κ i represents the weight factor of each sag measurement group, K represents the adjustment coefficient, and f b represents the standard sag value; Calculate the weight according to formula (10): Among them, ω i represents the weight of each sag measurement group; Calculate the weighted sag value according to formula (11): Among them, f ω represents the weighted sag value.

12. A calculation system for measuring the sag of a transmission line's ground wire at multiple measurement points, characterized in that, The calculation system includes: A ground wire sag measurement device for positioning and identifying the measuring points of the ground wire in a transmission line; A background calculation module for receiving the information of the measuring points obtained by the ground wire sag measurement device to execute the calculation method for measuring the sag of the ground wire at multiple measuring points in a transmission line as described in any one of claims 1-11.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that are used to be read by a machine so that the machine executes the calculation method for measuring the sag of the ground wire at multiple measuring points in a transmission line as described in any one of claims 1-11.

Images