System and method for measuring near electric distance of overhead line

Abstract

The invention relates to an overhead line near electric distance measurement system and measurement method. The system comprises a data acquisition system, a data analysis and calculation system and an early warning system. A group of data acquisition systems consisting of two image collectors and four sampling identifiers are arranged at different point positions on the ground, real-time data acquisition is performed on a construction site, and the acquired data are concentrated into an analysis and calculation system for analysis and calculation, so that the real-time distance between a machine and a live line is calculated, and the real-time distance between the machine and the live line is calculated. And if the distance close to the live line is close to the minimum safety distance, the early warning system gives out early warning to prompt an operator to keep the machine away from the live line. According to the invention, the risk of near live line construction can be dynamically evaluated in real time and early warning can be timely carried out, so that the field safety risk is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power construction, and in particular relates to an overhead line short-distance measurement system and a measurement method. Background Art

[0002] Overhead power lines are one of the main forms of power transmission and are widely used in urban and rural areas. In construction sites near live power lines, operations involving cranes, aerial work vehicles, excavators and other mechanical construction will inevitably have the problem of construction near live power lines. If the distance between the machine and the wire during mechanical construction is less than the minimum safety distance specified by the power industry, there will be a risk of discharge, which can easily lead to discharge and electric shock accidents. Therefore, it is necessary to strictly control the distance between the machine and the wire to be greater than the safety distance specified by the power industry. Currently, the commonly used methods include direct observation by personnel and setting up sealing grids. The former relies solely on the experience of the observers and lacks accuracy, while the latter has problems such as high cost, non-reusability, and poor timeliness. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an overhead line short-distance measurement system and a measurement method which have high accuracy, controllable cost, and simple and fast operation.

[0004] One of the above objects of the present invention is achieved by the following technical solution:

[0005] An overhead line short-distance measurement system includes a data acquisition system, a data analysis and calculation system, and an early warning system;

[0006] The data acquisition system is used to collect real-time data from the construction site and transmit the collected data to the data analysis and calculation system;

[0007] The data analysis and calculation system is used to calculate the minimum real-time distance between the machine and the energized line based on the input collected data, and transmit the minimum real-time distance to the early warning system;

[0008] The early warning system is used to compare the obtained real-time minimum distance with the preset minimum safety distance, and to make an alarm or prompt of the approaching danger according to the comparison result.

[0009] Moreover, the data acquisition system is composed of two independent image collectors and four sampling marks; wherein the horizontal acquisition viewing angle of the two independent image collectors is θ1, and the vertical acquisition viewing angle is θ2;

[0010] The layout of the four sampling marks is as follows: No. 1 sampling mark and No. 2 sampling mark are installed on the adjacent live wires, with a certain distance between them; No. 3 sampling mark is installed on the top of the machinery, and No. 4 sampling mark is placed on the ground near the construction machinery;

[0011] The two independent image collectors are set up as follows: the two image collectors are arranged near the machine and meet the following conditions: the two image collectors are at the same horizontal height as the No. 4 sampling mark; the two image collectors can capture all marks and are perpendicular to the line connecting the No. 4 sampling mark; by adjusting the position and shooting angle of the two image collectors, the No. 4 sampling mark is located at the center of the two captured images; the No. 4 sampling mark is taken as the coordinate origin, and the directions of the lines connecting the two image collectors and the coordinate origin are the X and Y axes to establish a three-dimensional coordinate system, in which the coordinates of the No. 1 image collector and the No. 2 image collector are (x 1 ,0,0)(0,y 1 ,0), measure and record the coordinate data, transmit it to the data analysis system and enter it as initial parameters.

[0012] Moreover, the early warning system includes a data comparison module and an alarm module.

[0013] The second object of the present invention is achieved by the following technical solution:

[0014] A measurement method based on the overhead line short-distance measurement system comprises the following steps:

[0015] Step 1: Two image collectors carry out synchronous sampling at a sampling frequency of once per second, and transmit the collected images to the data analysis and calculation system in real time. The images should include all sampling marks;

[0016] Step 2: The data analysis system uses a three-dimensional imaging algorithm to obtain the minimum distance between the top of the construction machinery and the live line according to the set parameters and the sampled images;

[0017] Step 3: The early warning system compares the obtained minimum distance with the preset minimum safety distance. If the obtained data is greater than twice the preset data, no alarm will occur. If the minimum distance is close to twice the minimum safety distance, an imminent danger warning will be issued. Within the range of twice the minimum safety distance, the closer the obtained data is to the minimum safety distance, the louder the alarm will be. When the distance is less than or equal to the minimum safety distance, an instruction of "Electricity danger! Stop operation immediately!" will be issued immediately.

[0018] Moreover, in step 2, the specific calculation method is as follows:

[0019] Calculate the spatial coordinates of sampling marker No. 3:

[0020] According to the horizontal acquisition angle of the image collector is θ 1 , the vertical acquisition angle is θ 2 , and the coordinates of image collector No. 2 are known to be (0,y 0,0), let the coordinates of the intersection of the edge of the image collected by image collector No. 2 with the X-axis and Z-axis be (x m ,0,0)、(0,0,z m ), we can obtain:

[0021] z m =y 0 tan(θ 2 ), x m =y 0 tan(θ 1 )

[0022] Thus, the unit length of the sampling image is determined, and the coordinates of any point on the image in the ZX plane are read; the coordinates of sampling mark No. 3 on the ZX plane image are read as (x 1 ,0,z 1 ), based on the fact that light propagates in a straight line, the spatial coordinates of sampling marker No. 3 must be located at the coordinates of image collector No. 2 (0, y 0 ,0) and (x 1 ,0,z 1 )

[0023] From the two-point form of a three-dimensional straight line, we can see that the straight line can be expressed as:

[0024]

[0025] Simplified to:

[0026]

[0027] Image collector No. 1 (x 0 The coordinates of sampling mark 3 on the YZ plane in the image collected by (0,y 2 ,z 2 ), the spatial coordinates of sampling marker No. 3 must be located at the coordinates of image collector No. 1 (x 0 ,0,0) and (0,y 2 ,z 2 )

[0028] From the two-point form of a three-dimensional straight line, we can see that the straight line can be expressed as:

[0029]

[0030] Two straight lines must intersect at one point (X 3 , Y 3 , Z 3 ), which is the spatial coordinate of sampling marker No. 3.

[0031] According to the solution method of the spatial coordinates of sampling mark No. 3, the spatial coordinates of sampling mark No. 1 and sampling mark No. 2 are obtained respectively (X 1 , Y 1 , Z 1 )(X 2 , Y 2 , Z 2 )

[0032] The coordinates of sampling mark No. 1 and sampling mark No. 2 can be used to derive the straight line equation of the conductor to be measured:

[0033]

[0034] From the midpoint of space (X 3 , Y 3 , Z 3 ) to the straight line constructed by the coordinates of sampling mark No. 1 and sampling mark No. 2, the minimum distance from the top of the machine to the wire is:

[0035] in

[0036] d: is the minimum distance from the top of the machine to the conductor,

[0037] is the direction vector of the straight line where sampling mark No. 1 and sampling mark No. 2 are located,

[0038] The direction vector of the straight line where sampling mark No. 3 and sampling mark No. 1 are located

[0039] The advantages and positive effects of the present invention are:

[0040] 1. The present invention consists of three parts: a data acquisition system, an analysis and calculation system, and an early warning system. A group of image data acquisition systems consisting of two image collectors and four sampling identifiers are arranged at different points on the ground to collect real-time data on the construction site. The collected data is concentrated in the analysis and calculation system for analysis and calculation, thereby calculating the real-time distance between the machine and the live line. If the distance to the live wire is close to the minimum safe distance, the early warning system will issue an early warning to prompt the operator to keep the machine away from the live line. The present invention can dynamically evaluate the risk of construction near live lines in real time and issue early warnings in a timely manner, thereby reducing on-site safety risks.

[0041] 2. The present invention combines the three-dimensional imaging algorithm with the near-electrical operation construction to realize the real-time measurement of the near-electrical distance and ensure the authenticity and reliability of the data.

[0042] 3. The present invention can be widely used in sites where mechanical construction is applied near live lines. It is not limited to power construction and has a wide range of usage scenarios.

[0043] 4. The present invention has the characteristics of convenient mobile arrangement, can be reused, and has significant cost advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a layout diagram of the overhead line short-distance measurement system of the present invention;

[0045] Figure 2 It is an image taken by the image collector according to the embodiment of the present invention. DETAILED DESCRIPTION

[0046] The structure of the present invention is further described below with reference to the accompanying drawings and by way of examples. It should be noted that the present examples are descriptive rather than restrictive.

[0047] A system for measuring the short-distance electrical distance of overhead lines, see Figure 1 and Figure 2 The invention point is: it includes a data acquisition system, a data analysis and calculation system and an early warning system.

[0048] The data acquisition system is used to collect real-time data from the construction site and transmit the collected data to the data analysis and calculation system. The data analysis and calculation system is used to calculate the minimum real-time distance between the machine and the live line based on the input collected data, and transmit the minimum real-time distance to the early warning system; the early warning system is used to compare the obtained real-time minimum distance with the preset minimum safety distance, and make an alarm or prompt of the approaching danger based on the comparison result.

[0049] The data acquisition system is composed of two independent image collectors and four sampling marks, wherein the horizontal acquisition angle of view of the two independent image collectors is θ1, and the vertical acquisition angle of view is θ2. The arrangement of the four sampling marks is as follows: the sampling mark No. 1 and the sampling mark No. 2 are installed on the adjacent live wire line, and can be installed by means of insulating rods, drones, etc., and the sampling mark No. 1 and the sampling mark No. 2 are kept at a certain distance. The sampling mark No. 3 is installed on the top of the machine, and the sampling mark No. 4 is placed on the ground near the construction machinery. The arrangement of the two independent image collectors is as follows: the two image collectors are arranged near the machine and meet the following conditions: first, the two image collectors are at the same horizontal height as the sampling mark No. 4; second, the two image collectors can capture all marks and are perpendicular to the line connecting the sampling mark No. 4; third, the position and shooting angle of the two image collectors are adjusted so that the sampling mark No. 4 is located at the center of the captured image. Finally, the 3D coordinate system is established with sampling mark No. 4 as the origin of the coordinates, and the directions of the lines connecting the two image collectors and the origin of the coordinates are respectively the X and Y axes, where the coordinates of image collector No. 1 and image collector No. 2 are respectively (x 1,0,0)(0,y 1 ,0). Measure and record the coordinate data, transmit it to the data analysis system, and input it as initial parameters.

[0050] The early warning system includes a data comparison module and an alarm module. The alarm module is composed of a data receiver, a comparator, a generator and other parts, and compares the received data with the preset data, and issues a sound warning according to the comparison result.

[0051] A measurement method based on the overhead line short-distance measurement system comprises the following steps:

[0052] Step 1: Two image collectors carry out synchronous sampling at a sampling frequency of once per second, and transmit the collected images to the data analysis and calculation system in real time, including all sampling marks;

[0053] Step 2: The data analysis system uses a three-dimensional imaging algorithm based on the set parameters and sampled images to obtain the minimum distance between the top of the construction machinery and the live line; the specific calculation method is as follows:

[0054] Taking the calculation of the spatial coordinates of sampling mark No. 3 as an example, the image captured by image collector No. 2 is set as Figure 2 As shown; according to the horizontal acquisition angle of the image collector is θ 1 , the vertical acquisition angle is θ 2 , and the coordinates of image collector No. 2 are known to be (0,y 0 ,0), and the coordinates of the intersection of the X-axis, Z-axis and the edge of the image are (0,0,z m )、(x m ,0,0), we can get:

[0055] z m =y 0 tan(θ 2 ), x m =y 0 tan(θ 1 )

[0056] Thus, the unit length of the sampling image can be determined, and the coordinates of any point on the image in the ZX plane (Y=0) can be read. Therefore, the coordinates of sampling mark No. 3 on the ZX plane image can be read as (x 1 ,0,z 1 ), since light propagates in a straight line, the spatial coordinates of sampling mark 3 must be located at the coordinates of image collector 2 (0, y 0 ,0) and (x 1 ,0,z 1 ) on the straight line formed by them.

[0057] From the two-point form of a three-dimensional straight line, we can see that the straight line can be expressed as:

[0058]

[0059] Simplified to:

[0060]

[0061] Similarly, image collector No. 1 (x 0 The coordinates of sampling mark 3 on the YZ plane in the image collected by (0,y 2 ,z 2 ), the spatial coordinates of sampling marker No. 3 must be located at the coordinates of image collector No. 1 (x 0 ,0,0) and (0,y 2 ,z 2 ) on the straight line formed by them.

[0062] From the two-point form of a three-dimensional straight line, we can see that the straight line can be expressed as:

[0063]

[0064] Two straight lines must intersect at one point (X 3 , Y 3 , Z 3 ), which is the spatial coordinate of sampling marker No. 3.

[0065] According to the above method for solving the spatial coordinates of sampling mark No. 3, the spatial coordinates of sampling mark No. 1 and sampling mark No. 2 can be obtained as (X 1 , Y 1 , Z 1 )(X 2 , Y 2 , Z 2 )

[0066] The coordinates of sampling mark No. 1 and sampling mark No. 2 can be used to derive the straight line equation of the conductor to be measured:

[0067]

[0068] From the midpoint of space (X 3 , Y 3 , Z 3 ) to the straight line (the straight line constructed by the coordinates of the No. 1 sampling mark and the No. 2 sampling mark) can be obtained from the distance formula to obtain the minimum distance from the top of the machine to the wire:

[0069] in

[0070] d: is the minimum distance from the top of the machine to the conductor,

[0071] is the direction vector of the straight line where sampling mark No. 1 and sampling mark No. 2 are located,

[0072] The direction vector of the straight line where sampling mark No. 3 and sampling mark No. 1 are located

[0073] Step 3. The early warning system compares the obtained minimum distance with the preset minimum safety distance. If the obtained data is greater than twice the preset data, no alarm will occur; if the minimum distance is close to twice the minimum safety distance, an imminent danger warning will be issued; within the range of twice the minimum safety distance, the closer the obtained data is to the minimum safety distance, the louder the alarm will be. When it is less than or equal to the minimum safety distance, an instruction of "Danger of near electricity! Stop work immediately!" will be issued immediately to ensure on-site construction safety.

[0074] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. An overhead line short-distance measurement system, characterized in that: Including data collection system, data analysis and calculation system and early warning system; The data acquisition system is used to collect real-time data from the construction site and transmit the collected data to the data analysis and calculation system; The data analysis and calculation system is used to calculate the minimum real-time distance between the machine and the energized line based on the input collected data, and transmit the minimum real-time distance to the early warning system; The early warning system is used to compare the obtained real-time minimum distance with the preset minimum safety distance, and to make an alarm or prompt of the approaching danger according to the comparison result.

2. The overhead line short-distance measurement system according to claim 1, characterized in that: The data acquisition system is composed of two independent image collectors and four sampling marks; wherein the horizontal acquisition viewing angle of the two independent image collectors is θ1, and the vertical acquisition viewing angle is θ2; The layout of the four sampling marks is as follows: No. 1 sampling mark and No. 2 sampling mark are installed on the adjacent live wires, with a certain distance between them; No. 3 sampling mark is installed on the top of the machinery, and No. 4 sampling mark is placed on the ground near the construction machinery; The two independent image collectors are set up as follows: the two image collectors are arranged near the machine and meet the following conditions: the two image collectors are at the same horizontal height as the No. 4 sampling mark; the two image collectors can capture all marks and are perpendicular to the line connecting the No. 4 sampling mark; by adjusting the position and shooting angle of the two image collectors, the No. 4 sampling mark is located at the center of the two collected images; with the No. 4 sampling mark as the coordinate origin, the directions of the lines connecting the two image collectors and the coordinate origin are the X and Y axes to establish a three-dimensional coordinate system, in which the coordinates of the No. 1 image collector and the No. 2 image collector are (x1,0,0)(0,y1,0), respectively. The coordinate data are measured and recorded, transmitted to the data analysis system, and entered as initial parameters.

3. The overhead line short-distance measurement system according to claim 1, characterized in that: The early warning system includes a data comparison module and an alarm module.

4. A measurement method based on the overhead line short-distance measurement system according to any one of claims 1 to 3, characterized in that: The steps include: Step 1: Two image collectors carry out synchronous sampling at a sampling frequency of once per second, and transmit the collected images to the data analysis and calculation system in real time. The images should include all sampling marks; Step 2: The data analysis system uses a three-dimensional imaging algorithm to obtain the minimum distance between the top of the construction machinery and the live line according to the set parameters and the sampled images; Step 3: The early warning system compares the obtained minimum distance with the preset minimum safety distance. If the obtained data is greater than twice the preset data, no alarm will be issued; if the minimum distance is close to twice the minimum safety distance, an approaching danger prompt will be issued; within the range of twice the minimum safety distance, the closer the obtained data is to the minimum safety distance, the louder the alarm will be. When it is less than or equal to the minimum safety distance, an instruction of "Electricity danger! Stop operation immediately!" will be issued immediately.

5. The measurement method according to claim 4 based on the overhead line short-distance measurement system according to any one of claims 1 to 3, characterized in that: Calculate the spatial coordinates of sampling marker No. 3: The horizontal acquisition angle of view of the image collector is θ1, the vertical acquisition angle of view is θ2, and the coordinates of the image collector No. 2 are known to be (0, y0, 0). Suppose the coordinates of the intersection of the edge of the image collected by the image collector No. 2 with the X-axis and the Z-axis are (x m ,0,0)、(0,0,z m ), we can obtain: z m =y0·tan(θ2)、x m =y0·tan(θ1) According to the coordinates of the image edge, the unit length of the sampling image is determined, and the coordinates of the ZX plane of any point on the image are read; the coordinates of sampling mark No. 3 on the image collected by sampling mark No. 2 are read as (x1,0,z1). Based on the fact that light propagates in a straight line, the spatial coordinates of sampling mark No. 3 must be located on the straight line formed by the coordinates (0,y0,0) of image collector No. 2 and (x1,0,z1); From the two-point form of a three-dimensional straight line, we can see that the straight line can be expressed as: Simplified to: Similarly: the coordinates of sampling mark No. 3 on the YZ plane in the image collected by image collector No. 1 (x0,0,0) are (0,y2,z2), and the spatial coordinates of sampling mark No. 3 must be located on the straight line connecting the coordinates of image collector No. 1 (x0,0,0) and (0,y2,z2); From the two-point form of a three-dimensional straight line, we can see that the straight line can be expressed as: The two straight lines must intersect at one point (X3, Y3, Z3), which is the spatial coordinate of sampling marker No. 3; According to the solution method of the spatial coordinates of sampling mark No. 3, the spatial coordinates of sampling mark No. 1 and sampling mark No. 2 are obtained as (X1, Y1, Z1) (X 2， Y2, Z2) The coordinates of sampling mark No. 1 and sampling mark No. 2 can be used to derive the straight line equation of the conductor to be measured: The distance formula from the midpoint (X3, Y3, Z3) in space to the straight line constructed by the coordinates of sampling marker No. 1 and sampling marker No. 2 gives the minimum distance from the top of the machine to the wire: in d: is the minimum distance from the top of the machine to the conductor, is the direction vector of the straight line where sampling mark No. 1 and sampling mark No. 2 are located, It is the direction vector of the straight line where sampling mark No. 3 and sampling mark No. 1 are located.

Images