CN102721371B - Method for calculating sag of power transmission line - Google Patents
Method for calculating sag of power transmission line Download PDFInfo
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- CN102721371B CN102721371B CN201210225585.8A CN201210225585A CN102721371B CN 102721371 B CN102721371 B CN 102721371B CN 201210225585 A CN201210225585 A CN 201210225585A CN 102721371 B CN102721371 B CN 102721371B
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- transmission line
- power transmission
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- shaft tower
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Abstract
The invention discloses a device and a method for calculating the sag of a power transmission line in the technical field of laser measurement. The device comprises a GPS (global positioning system), a height calculating helicopter, a holder, a rangefinder and a computing module; the holder is fixed in the helicopter; and the rangefinder is fixed on the holder and is connected with the computing module. The required data are measured by the laser rangefinder under conditions with no power failure, hiking ground operations are avoided, and the working hours and labor intensity of sag measurement are reduced; and the problems of complex operations, low efficiency and low accuracy in sag measurement are solved effectively.
Description
Technical field
The invention belongs to laser measuring technique field, relate in particular to a kind of power transmission line sag calculation element and method.
Background technology
The sag of transmission line of electricity is the important parameter of circuit operation and maintenance, and regularly to setting up the sag of power transmission line, to carry out the get it right security of operation of circuit of meter significant.Existing computing method mainly rely on technician's ground artificial measurement on foot, it is larger that the method is affected by the factor such as geography and physical environment, for the transmission line of electricity along the line severe section of with a varied topography, geographical environment, operating difficulties, the large and inefficiency of error.
A kind of power transmission line sag computing method based on laser range finder are provided, utilize helicopter to use laser range finder to carry out relevant range observation in the air at height by technician, and realize the calculating of sag by new method.Effectively solve sag in the severe situation of transmission line of electricity geographical environment along the line and measure complicated operation, efficiency is low, a difficult problem for poor accuracy.
Summary of the invention
For deficiencies such as existing power transmission line sag measurement complicated operation, the efficiency mentioned in above-mentioned background technology are low, the present invention proposes a kind of power transmission line sag calculation element and method.
Technical scheme of the present invention is that a kind of power transmission line sag calculation element, is arranged on the helicopter that GPS positioning system and altitude gauge are housed, and it is characterized in that this device comprises The Cloud Terrace, stadimeter and computing module;
Described The Cloud Terrace is fixed in helicopter; Stadimeter is fixed on The Cloud Terrace, and is connected with computing module.
Described stadimeter is telescope-type laser range finder.
Described The Cloud Terrace is hand head.
Calculate a method for power transmission line sag, for calculating the sag of power transmission line between two shaft towers, it is characterized in that the method comprises the following steps:
Step 1: obtain distance and the hitch point altitude information of power transmission line on two shaft towers between two shaft towers;
Step 2: set up three-dimensional system of coordinate according to two shaft towers, helicopter is hovered over to the assigned address of this three-dimensional system of coordinate;
Step 3: on the basis of step 1, adjust The Cloud Terrace and stadimeter, measure respectively described assigned address to the distance between power transmission line sag point and each shaft tower power transmission line hitch point;
Step 4: utilize computing module to try to achieve power transmission line sag on the basis of step 3.
The plane that the top of described assigned address and two shaft towers forms and the angle of surface level are 20 ° to 60 °, and the angle of the top of two shaft towers and the line of helicopter is 60 ° to 120 °, and more than described assigned address is positioned at shaft tower line top.
The calculation procedure of described power transmission line sag is:
A. divide contour and two the not contour two kinds of situations of shaft tower power transmission line hitch point of two shaft tower power transmission line hitch points to calculate power transmission line sag point distance overhead;
B. in the time that two shaft tower power transmission line hitch points are contour, the computing formula of sag is:
f
1＝b-c
Wherein:
F
1be the sags of two shaft tower power transmission line hitch points when contour;
B is the height value of two shaft tower power transmission line hitch points;
C is power transmission line sag point distance overhead;
C. in the time that two shaft tower power transmission line hitch points are not contour, the computing formula of sag is:
Wherein:
F
2be the sags of two shaft tower power transmission line hitch points when not contour;
D is the height value of a shaft tower power transmission line hitch point;
B
3for the height value of another shaft tower power transmission line hitch point.
The device and method that the method calculating sag that a kind of use is new is provided, utilizes laser range finder to measure desired data in the situation that not having a power failure, and easy to operate, accuracy is good; Realize aerological measurement by helicopter, avoid Ground Operation on foot, man-hour and labour intensity that sag is measured are reduced, especially significant for the calculating of the power transmission line sag on the severe section of mountain valley, rivers etc. along the line with a varied topography, geographical environment, efficiently solve it because the sag that current difficulty causes is measured complicated operation, efficiency is low, a difficult problem for poor accuracy.According to the difference of actual conditions, computing method are divided into two kinds of situations, measure respectively for the contour and not contour situation of two hitch points on power transmission line, improve the accuracy of result of calculation, for the safe operation of circuit provides safeguard.
Brief description of the drawings
Fig. 1 is transmission line of electricity sag instrumentation plan in the contour situation of the present invention's two shaft tower hitch point;
Fig. 2 is transmission line of electricity sag instrumentation plan in the not contour situation of the present invention's two shaft tower hitch point.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that, following explanation is only exemplary, instead of in order to limit the scope of the invention and to apply.
Power transmission line sag computing method based on laser range finder, comprising: the helicopter of altitude gauge and GPS positioning system is housed, hand head, telescope-type laser range finder, the computing module being connected with laser range finder.
In helicopter, load The Cloud Terrace, telescope-type laser range finder and the computing module being connected with laser range finder.For the transmission line of electricity having set up, on shaft tower, the hitch point height of power transmission line and the position of two shaft towers all can be looked into, thereby can utilize GPS positioning system is 20 ° to 60 ° by helicopter in hover in the plane forming with the top of two shaft towers and the angle of surface level, and the angle of the top of two shaft towers and the line of helicopter is 60 ° to 120 °, and be positioned at position more than shaft tower line top, so that relevant range observation, on shaft tower, the hitch point height of power transmission line and the position of two shaft towers all can be looked into.The Cloud Terrace is fixed in helicopter, laser range finder is fixedly mounted on The Cloud Terrace, manually control the rotation of The Cloud Terrace horizontal direction and vertical direction, in the time that the cross chevilled silk on the laser range finder eyepiece of its carrying aims at the mark, utilize laser range finder to find range and record.Utilize the altitude gauge in helicopter, draw the height off the ground of helicopter, and then obtain the height off the ground of helicopter inner laser stadimeter.Computing method are enrolled in computing module, and computing module is connected with laser range finder by interface, and the measurement result of laser range finder is transported in computing module, can calculate sag.Computing method are divided into contour and not contour two kinds of hitch point on two shaft towers according to actual conditions difference, below two kinds of situations are described respectively:
One, the contour situation of hitch point
Set up as shown in Figure 1 right hand rectangular coordinate system in space, the geometric center contacting with ground taking shaft tower 1 is initial point O, cross some O and make three number axis perpendicular to each other, wherein the direction at the center of the central horizontal of shaft tower 1 sensing shaft tower 2 is x direction of principal axis, the direction that initial point O points to head of mast is z direction of principal axis, and direction inwards vertical with xOy plane is y direction of principal axis.E (x in figure, y, z) be the position at laser range finder place in helicopter, its coordinate meets 0<x<a, y>0, z>b, and between AEB, angle is greater than 60 ° and be less than 120 °, the angle of plane AEB and surface level is 20 ° to 60 °, makes to be fixed in the The Cloud Terrace angular range that permission is rotated with vertical direction in the horizontal direction in helicopter to make the laser range finder of its carrying scan any point on power transmission line.The value of reading helicopter inner height meter makes z known, and A, B are two hitch points, and two shaft towers are all known apart from a and hitch point height off the ground b.
Rotary platform, first makes the cross chevilled silk on laser range finder eyepiece aim at respectively A, B 2 points, and measures its distance to 2, is designated as d
1, d
2, measure again the distance of laser range finder to this grade of wire minimum point: any rear flank along continuous straight runs that the cross chevilled silk on eyepiece is aimed at outside wire shelves at the uniform velocity scans to opposite side, if have twice sweep in scanning process to wire, (minimum angles is preferably the running accuracy of The Cloud Terrace The Cloud Terrace to be rotated vertically downward to a minimum angles, such as 0.01 degree), opposite side outside along continuous straight runs guiding line shelves scanning again, until can only once scan the point on power transmission line on certain level face, this point is the minimum point of this grade of wire, be designated as G point, now measure the distance that laser range finder is ordered to G, be designated as d
3.G point is sag (i.e. GH in figure) to the distance of the pedal line of A, B line, is designated as f.In the time that wire hitch point is contour, in shelves, maximum sag, in span central authorities, equates to two shaft towers distances for G o'clock, is 0.5a, G point coordinate be (0.5a, 0, c).
Utilize above known conditions and relevant geometric knowledge can calculate the sag of power transmission line in the contour situation of hitch point, circular is as follows:
AE distance is d
1, that is: x
2+ y
2+ (z-b)
2=d
1 2
BE distance is d
2, that is:
EG distance is d
3, that is:
Separate system of equations that above three formulas form and get final product to obtain the value of x, y, c, thus sag f
1=b-c can obtain.
Two, the not contour situation of hitch point
Set up rectangular coordinate system in space by method similar to the above as shown in Figure 2, the selection of helicopter in hover position need meet following some: (1) is in coordinate system in the first octant; (2), in the plane of x=0.5a, can utilize GPS positioning system to guarantee that by location certain in the plane of x=0.5a of helicopter in hover a bit according to the position of two shaft tower hitch points; (3) E (x, y, z) is the position at laser range finder place in helicopter, and its coordinate meets 0<x<a, y>0, z>b
3, and between AEB, angle is greater than 60 ° and be less than 120 °, and the angle of plane AEB and surface level is 20 ° to 60 °, can scan minimum point and two hitch points on power transmission line with the laser range finder that ensures to be fixed in helicopter.Behind the position like this helicopter in hover being required more than meeting, utilize altitude gauge can make z known; A, B are two hitch points, and two shaft towers are all known apart from a and hitch point height off the ground b, d.
Rotary platform, first makes the cross chevilled silk on laser range finder eyepiece aim at respectively A, B 2 points, and measures its distance to 2, is designated as d
1, d
2.Adjust The Cloud Terrace angle, make it just to power transmission line.Control The Cloud Terrace and rotate in vertical direction, until the cross chevilled silk on the laser range finder eyepiece of its carrying scans on power transmission line, the point that note is aimed at is G point and measures the distance that laser range finder is ordered to G, is designated as d
3.Because helicopter in hover is in the plane of x=0.5a, and The Cloud Terrace is just to power transmission line vertical scanning, and known G point is two shaft tower mid points, its coordinate be (0.5a, 0, c).Due to when wire hitch point not contour (absolute altitude not etc.), in shelves, a maximum sag appears at span centre, and known G point is sag to the distance GH of the pedal line of A, B line, is designated as f
2.
Utilize above known conditions and relevant geometric knowledge can calculate the sag of power transmission line in the contour situation of hitch point, circular is as follows:
AE distance is d
1, that is: x
2+ y
2+ (z-b
3)
2=d
1 2
BE distance is d
2, that is:
EG distance is d
3, that is:
Separate system of equations that above three formulas form and get final product to obtain the value of x, y, c, thus sag
can obtain.
Power transmission line sag computing method based on laser range finder, comprising: the helicopter of altitude gauge and GPS positioning system is housed, hand head, telescope-type laser range finder, the computing module being connected with laser range finder.First from electric power enterprise, find on shaft tower the position of two hitch point height and two shaft towers on power transmission line as precondition, and the height value of two hitch points is manually input in computing module.Helicopter E is hovered over to coordinate in the rectangular coordinate system set up as shown in Figure 1, Figure 2 and meet 0<x<a, y>0, z>b, and between AEB, angle is greater than 60 ° and be less than 120 °, plane AEB and the angle of surface level is the appropriate location of 20 ° to 60 °, so that relevant range observation.For the not contour situation of hitch point, also to utilize GPS positioning system to ensure that according to the position of two shaft towers helicopter in hover is in the plane of x=0.5a.Determine behind the position of helicopter, The Cloud Terrace is horizontally fixed in helicopter, and laser range finder is fixedly mounted on The Cloud Terrace.Utilize the altitude gauge in helicopter, draw the height off the ground of helicopter, be approximately the height off the ground (z) of helicopter inner laser stadimeter.The height value of reading (z) is manually input in computing module, as the necessary condition of calculating sag.Manually control the rotation of The Cloud Terrace horizontal direction and vertical direction, thereby the point that the cross chevilled silk on laser range finder eyepiece is aimed at changes thereupon, in the time that it scans A, B, utilize laser range finder to measure its distance to 2 of A, B at 2, be designated as respectively d
1, d
2.Measure d according to the difference of hitch point difference in height on power transmission line by different methods of operating again
3: if two hitch points are contour, any rear flank along continuous straight runs that cross chevilled silk on eyepiece is aimed at outside wire shelves at the uniform velocity scans to opposite side, if have twice sweep in scanning process to wire, (minimum angles is preferably the running accuracy of The Cloud Terrace The Cloud Terrace to be rotated vertically downward to a minimum angles, such as 0.01 degree), opposite side outside along continuous straight runs guiding line shelves scanning again, until can only once scan the point on power transmission line on certain level face, this point is the minimum point of this grade of wire, be designated as G point, now measure the distance that laser range finder is ordered to G, be designated as d
3, if two hitch points are not contour, adjust The Cloud Terrace angle, make it just to power transmission line.Control The Cloud Terrace and rotate in vertical direction, until the cross chevilled silk on the laser range finder eyepiece of its carrying scans on power transmission line, the point that note is aimed at is G point and measures the distance that laser range finder is ordered to G, is designated as d
3.Laser range finder is connected with computing module by interface, when laser range finder measures respectively d
1, d
2, d
3value time, measurement result is transported in computing module by interface, as calculate necessary condition.According to the sag computing formula of deriving, computing method are enrolled in computing module, then by input d
1, d
2, d
3, the height value of two hitch points on power transmission line on the value of z and shaft tower, can utilize computing module to calculate the sag on power transmission line.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (2)
1. the computing method of a power transmission line sag, for calculating the sag of power transmission line between two shaft towers, the method is taking power transmission line sag calculation element as basis, and this device comprises GPS positioning system, altitude gauge, hand head, telescope-type laser range finder and computing module; Hand head is fixed in helicopter; Telescope-type laser range finder is fixed on hand head, and is connected with computing module; It is characterized in that, the method comprises the following steps:
Step 1: obtain distance and the hitch point altitude information of power transmission line on two shaft towers between two shaft towers;
Step 2: set up three-dimensional system of coordinate according to two shaft towers, helicopter is hovered over to the assigned address of this three-dimensional system of coordinate;
The plane that the top of described assigned address and two shaft towers forms and the angle of surface level are 20 ° to 60 °, and the angle of the top of two shaft towers and the line of helicopter is 60 ° to 120 °, and more than described assigned address is positioned at shaft tower line top;
Step 3: on the basis of step 1, adjust hand head and telescope-type laser range finder, measure respectively described assigned address to the distance between power transmission line sag point and each shaft tower power transmission line hitch point;
Step 4: utilize computing module to try to achieve power transmission line sag on the basis of step 3.
2. a kind of power transmission line sag computing method according to claim 1, is characterized in that the calculation procedure of described power transmission line sag is:
A. divide contour and two the not contour two kinds of situations of shaft tower power transmission line hitch point of two shaft tower power transmission line hitch points to calculate power transmission line sag point distance overhead;
B. in the time that two shaft tower power transmission line hitch points are contour, the computing formula of sag is:
f
1=b-c
Wherein:
F
1be the sags of two shaft tower power transmission line hitch points when contour;
B is the height value of two shaft tower power transmission line hitch points;
C is power transmission line sag point distance overhead;
C. in the time that two shaft tower power transmission line hitch points are not contour, the computing formula of sag is:
f
2=1/2(d+b3)-c
Wherein:
F
2be the sags of two shaft tower power transmission line hitch points when not contour;
D is the height value of a shaft tower power transmission line hitch point;
B
3for the height value of another shaft tower power transmission line hitch point.
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| CN108844467A (en) * | 2018-04-24 | 2018-11-20 | 四川汇源光通信有限公司 | Arc sag based on laser three-D reconstruct monitors system and method |
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| CN110906872B (en) * | 2019-11-29 | 2021-08-20 | 河南送变电建设有限公司 | Method for observing and adjusting lead through high-efficiency gear side sag |
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| CN113405509A (en) * | 2021-06-07 | 2021-09-17 | 云南电网有限责任公司大理供电局 | Method for measuring conductor sag of power transmission line based on unmanned aerial vehicle |
| CN114061464A (en) * | 2021-09-24 | 2022-02-18 | 国网浙江省电力有限公司台州供电公司 | Unmanned aerial vehicle wire sag intelligent monitoring device based on RTK platform |
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