CN113959402A - Method, device and medium for monitoring sag point elevation of power overhead line - Google Patents

Method, device and medium for monitoring sag point elevation of power overhead line Download PDF

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CN113959402A
CN113959402A CN202111212957.9A CN202111212957A CN113959402A CN 113959402 A CN113959402 A CN 113959402A CN 202111212957 A CN202111212957 A CN 202111212957A CN 113959402 A CN113959402 A CN 113959402A
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sag
monitoring
ground
elevation
monitoring point
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CN113959402B (en
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江俊飞
许海林
鄂盛龙
罗颖婷
王磊
黄勇
田翔
石墨
成国雄
朱凌
刘琦
郭圣
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Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Abstract

The invention discloses a method, equipment and a medium for monitoring the elevation of a sag point of an overhead power line, wherein the method comprises the following steps: the method comprises the steps that an optical theodolite is adopted to determine geodetic coordinates of sag initial monitoring points of the power overhead line, projection coordinates of the initial monitoring points on the ground and geodetic coordinates obtained by preprocessing the geodetic coordinates of periodically acquired sag monitoring points of the power overhead line; calculating an initial elevation value of the sag monitoring point from the ground and an elevation monitoring value of the sag monitoring point from the ground in the geocentric rectangular coordinate system according to the geodetic coordinates of the initial monitoring point, the projection coordinates of the initial monitoring point on the ground and the processed geodetic coordinates; and judging whether the power overhead line has galloping or not according to the difference between the elevation initial value of the sag monitoring point from the ground and the elevation monitoring value of the sag monitoring point from the ground, and outputting a judgment result. The invention reduces the overhead line sag measurement cost and improves the measurement precision.

Description

Method, device and medium for monitoring sag point elevation of power overhead line
Technical Field
The invention relates to the technical field of power equipment monitoring, in particular to a method, equipment and medium for monitoring sag point elevation of an overhead power line.
Background
The electric energy output by a power plant can reach a user end only through a long-distance transmission process, and at present, the electric energy transmission mainly depends on a power transmission overhead line, wherein sag is an important safety index of the operation of the overhead line, and the sag is the vertical distance between the lowest point of a lead and a connecting line between two suspension points on two adjacent base towers. The overhead line is influenced by strong wind waving, gravity and the like in long-term operation, and the problems of looseness of bolts at fixed points and the like can exist, so that the sag of the line is increased. When the sag of the power transmission line is increased, the distance of the lead to a cross spanning object is further insufficient under the influence of subsequent gravity, stress and the like, the safety of the cross spanning area is influenced, and great potential safety hazards are generated on equipment operation and personnel activities in the area.
The existing overhead line sag observation mainly needs professionals to be carried out on site through an optical theodolite, and the observation cost is high due to the fact that the power transmission line is wide in distribution and the site environment is severe. At present, methods for monitoring the elevation of the sag point through a camera, a laser radar and the like exist, but the camera and the laser radar are high in cost, the monitoring and calculating principle is complex, the monitoring precision is not high enough in actual operation, and the measuring effect is poor.
Disclosure of Invention
The invention aims to provide a method, equipment and medium for monitoring the sag point elevation of an electric overhead line, so as to solve the problems of high sag measurement cost and low precision of the overhead line in the prior art.
In order to achieve the purpose, the invention provides a sag elevation monitoring method for an overhead power line, which comprises the following steps:
the method comprises the steps that an optical theodolite is adopted to determine the geodetic coordinates of an initial sag monitoring point of the power overhead line, the projection coordinates of the initial monitoring point on the ground and the geodetic coordinates of periodically acquired sag monitoring points of the power overhead line;
preprocessing the geodetic coordinates of the periodically acquired sag monitoring points of the overhead power line to acquire the processed geodetic coordinates;
calculating an initial elevation value of the sag monitoring point from the ground and an elevation monitoring value of the sag monitoring point from the ground in a geocentric rectangular coordinate system according to the geodetic coordinates of the initial monitoring point, the projection coordinates of the initial monitoring point on the ground and the processed geodetic coordinates;
and judging whether the power overhead line has galloping or not according to the difference between the calculated elevation initial value of the sag monitoring point from the ground and the elevation monitoring value of the sag monitoring point from the ground, and outputting a judgment result.
Preferably, the geodetic coordinates of the initial monitoring point, the projection coordinates of the initial monitoring point on the ground and the processed geodetic coordinates are respectively converted into corresponding geocentric rectangular coordinates, and the conversion formula is as follows:
Figure BDA0003309044950000021
Figure BDA0003309044950000022
Figure BDA0003309044950000023
in the formula (X)A,YA,ZA) Representing the transformed geocentric rectangular coordinates of the geodetic coordinates of the initial monitoring point, wherein XA,YA,ZARespectively representing the longitude, latitude and height of the geocentric rectangular coordinate after the geodetic coordinate conversion of the initial monitoring point, (X)G,YG,ZG) Representing the transformed geocentric rectangular coordinates of the projection coordinates of the initial monitoring point on the ground, wherein XG,YG,ZGRespectively representing longitude, latitude and height of geocentric rectangular coordinates after the transformation of projection coordinates of the initial monitoring point on the ground, (X)P,YP,ZP) Representing the processed transformed geocentric rectangular coordinates of the geodetic coordinate, wherein XP,YP,ZPRespectively representing the longitude, latitude and height of the processed geocentric rectangular coordinate after geodetic coordinate conversion, NA,NG,NPAnd the curvature radius of the prime monitoring point, the projection point of the prime monitoring point on the ground and the processed prime coordinate reference ellipse are respectively represented.
Preferably, according to the difference value of the geodetic coordinates of the initial monitoring points and the geocentric rectangular coordinates of the initial monitoring points after the projection coordinates of the initial monitoring points on the ground are converted, the elevation initial value of the sag monitoring points from the ground is obtained;
and acquiring an elevation monitoring value of the sag monitoring point from the ground according to the calculated difference value of the processed geodetic coordinate and the geocentric rectangular coordinate of the initial monitoring point after the projection coordinate of the sag monitoring point on the ground is converted.
Preferably, determining an initial elevation value of the sag monitoring point from the ground as a first difference value according to an absolute value of a difference value between the height of the geocentric rectangular coordinate of the initial monitoring point after the geodetic coordinate conversion and the height of the geocentric rectangular coordinate of the initial monitoring point on the ground after the projection coordinate conversion;
determining an elevation monitoring value of the sag monitoring point from the ground as a second difference value according to the absolute value of the difference value between the height of the geocentric rectangular coordinate after the geodetic coordinate conversion and the height of the geocentric rectangular coordinate after the projection coordinate of the initial monitoring point on the ground is converted;
and determining the difference between the initial elevation value of the sag monitoring point from the ground and the elevation monitoring value of the sag monitoring point from the ground as a third difference according to the absolute value of the difference between the first difference and the second difference.
Preferably, the judging whether the overhead power line has galloping or not and outputting a judgment result includes:
if the third difference is larger than 5% of the first difference, early warning is carried out and the electric overhead line is judged to have galloping;
further, the heights of N groups of periodically acquired sag monitoring points of the power overhead line before the power overhead line gallows are acquired according to the time point when the third difference value is greater than 5% of the first difference value, the absolute value and the integral mean value between any two groups of the heights of the periodically acquired sag monitoring points of the power overhead line are calculated, and the maximum absolute value between any two groups of the absolute values is acquired;
if the maximum absolute value is larger than 10% of the overall average value, judging that the early warning is false;
and if the maximum absolute value is less than or equal to 10% of the overall average value, judging that the overhead power line has galloping and line droop tendency.
Preferably, the obtaining the processed geodetic coordinates specifically includes:
in a preset period, calculating the longitude average value L in geodetic coordinates of periodically acquired sag monitoring points of the power overhead linePAnd calculating the latitude average value B in the geodetic coordinates of the periodically acquired sag monitoring points of the power overhead linePAnd calculating the height average value H in the geodetic coordinates of the periodically acquired sag monitoring points of the power overhead linePObtaining said processed geodetic coordinates (L)P,BP,HP) The formula is as follows:
LP＝(L1+L2+...+LN)/N；
BP＝(B1+B2+...+BN)/N；
HP＝(H1+H2+...+HN)/N；
in the formula, N represents the group number of the geodetic coordinates of the periodically acquired sag monitoring points of the power overhead line.
Preferably, before calculating an initial elevation value of the sag monitoring point from the ground and an elevation monitoring value of the sag monitoring point from the ground in the geocentric rectangular coordinate system, the method further includes:
and calculating the longitude standard deviation, the latitude standard deviation and the height standard deviation of the sag monitoring point of the overhead power line according to the processed geodetic coordinates.
Preferably, the calculating of the longitude standard deviation, the latitude standard deviation and the height standard deviation of the sag monitoring point of the overhead power line according to the processed geodetic coordinates specifically includes:
Figure BDA0003309044950000031
Figure BDA0003309044950000032
Figure BDA0003309044950000033
in the formula, LσRepresents the standard deviation of longitude of the sag monitoring point of the power overhead line, BσLatitude standard deviation H of sag monitoring point of power overhead lineσHeight standard deviation L of sag monitoring point of power overhead linei,Bi,HiRespectively representing the longitude, the latitude and the height of the ith group of periodically acquired power overhead line sag monitoring points.
The present invention also provides a terminal device, including:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method of overhead power line sag elevation monitoring as described in any one of the above.
The invention also provides a computer-readable storage medium having stored thereon a computer program for execution by a processor to implement a method of sag elevation monitoring of an electrical overhead line as defined in any one of the preceding claims.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through continuously acquiring Beidou high-precision positioning data and acquiring corresponding coordinates, data preprocessing is carried out on the corresponding coordinates, the elevation of the sag point from the ground is calculated on the basis, the difference value between the monitoring value and the initial value is analyzed, and meanwhile, whether line galloping exists can be further analyzed. Therefore, the problems that in the prior art, monitoring cost is high, monitoring precision and monitoring effect are not ideal during working are solved, monitoring stability is improved, and reliability of operation of cross-over lines is guaranteed.
Further, the standard deviation of the data is calculated, and on the basis of judging that the line galloping exists, whether line fluctuation caused by the line galloping exists or not is judged.
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In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a sag elevation monitoring method for an overhead power line according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an installation of a sag elevation monitoring device for an overhead power line according to another embodiment of the present invention;
FIG. 3 is a schematic flow chart of a sag elevation monitoring method for an overhead power line according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a computer terminal device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a method for monitoring an elevation of an sag point of an overhead power line, including the following steps:
s101: and determining the geodetic coordinates of the sag initial monitoring points of the power overhead line, the projection coordinates of the initial monitoring points on the ground and the geodetic coordinates of the sag monitoring points of the power overhead line, which are periodically acquired.
Referring to fig. 2, specifically, by using a centimeter-level high-precision positioning optical theodolite, the Real-time kinematic (RTK) positioning precision can reach 2.5cm ± 1ppm, the positioning frequency is 1Hz, the optical theodolite is used to confirm that the optical theodolite is installed at the maximum sag point a, and the initial geodetic coordinate (L) of the monitoring point a is measured under a static conditionA,BA,HA) The ground projection point G of the monitoring point on the ground has the geodetic coordinate (L)G,BG,HG) And carrying out batch preprocessing on 100 groups of positioning data every 10 minutes, calculating characteristic parameters, and periodically acquiring geodetic coordinates of sag monitoring points of the overhead power line.
S102: and preprocessing the geodetic coordinates of the periodically acquired sag monitoring points of the overhead power line to acquire the processed geodetic coordinates.
Specifically, the geodetic coordinates of the sag monitoring points of the overhead power line acquired periodically in the step S101 are preprocessed to obtain a set of accurate positioning coordinates (L)P,BP,HP) And carrying out characteristic calculation through monitoring data and judging that hidden dangers exist.
In a preset period, calculating the longitude average value L in geodetic coordinates of periodically acquired sag monitoring points of the power overhead linePAnd calculating the latitude in geodetic coordinates of periodically acquired sag monitoring points of the power overhead lineAverage value BPAnd calculating the height average value H in the geodetic coordinates of the periodically acquired sag monitoring points of the power overhead linePObtaining the processed geodetic coordinates (L)P,BP,HP) The formula is as follows:
LP＝(L1+L2+...+LN)/N；
BP＝(B1+B2+...+BN)/N；
HP＝(H1+H2+...+HN)/N；
in the formula, N represents the group number of the geodetic coordinates of the periodically acquired sag monitoring points of the power overhead line.
Acquiring N groups of geodetic coordinates, and calculating N groups of geodetic coordinates as processed geodetic coordinates (L)P,BP,HP) And calculating the longitude standard deviation, the latitude standard deviation and the height standard deviation of the sag monitoring point of the power overhead line according to the processed geodetic coordinates, wherein the specific calculation formula is as follows:
Figure BDA0003309044950000061
Figure BDA0003309044950000062
Figure BDA0003309044950000063
in the formula, LσRepresents the standard deviation of longitude of the sag monitoring point of the power overhead line, BσLatitude standard deviation H of sag monitoring point of power overhead lineσHeight standard deviation L of sag monitoring point of power overhead linei,Bi,HiRespectively representing the longitude, the latitude and the height of the ith group of periodically acquired power overhead line sag monitoring points.
S103: and calculating an initial elevation value of the sag monitoring point from the ground and an elevation monitoring value of the sag monitoring point from the ground in a geocentric rectangular coordinate system according to the geodetic coordinates of the initial monitoring point, the projection coordinates of the initial monitoring point on the ground and the processed geodetic coordinates.
Specifically, the geodetic coordinates of the initial monitoring point, the projection coordinates of the initial monitoring point on the ground and the processed geodetic coordinates are respectively converted into geocentric rectangular coordinates, and a specific calculation formula is as follows:
Figure BDA0003309044950000064
Figure BDA0003309044950000065
Figure BDA0003309044950000066
in the formula (X)A,YA,ZA) Representing the transformed geocentric rectangular coordinates of the geodetic coordinates of the initial monitoring point, wherein XA,YA,ZARespectively representing the longitude, latitude and height of the geocentric rectangular coordinate after the geodetic coordinate conversion of the initial monitoring point, (X)G,YG,ZG) Representing the transformed geocentric rectangular coordinates of the projection coordinates of the initial monitoring point on the ground, wherein XG,YG,ZGRespectively representing longitude, latitude and height of geocentric rectangular coordinates after the transformation of projection coordinates of the initial monitoring point on the ground, (X)P,YP,ZP) Representing the processed transformed geocentric rectangular coordinates of the geodetic coordinate, wherein XP,YP,ZPRespectively representing the longitude, latitude and height of the processed geocentric rectangular coordinate after geodetic coordinate conversion, NA,NG,NPPrime monitoring point, projection point of prime monitoring point on ground and processed geodetic coordinate reference ellipse fourth-unit circleA radius of curvature.
NA,NG,NPThe calculation formulas are respectively as follows:
Figure BDA0003309044950000071
Figure BDA0003309044950000072
Figure BDA0003309044950000073
in the formula, a represents the major semi-axis of the earth reference ellipsoid, e is the first eccentricity of the earth ellipsoid, and the specific values are as follows:
Figure BDA0003309044950000074
determining a first difference h according to the absolute value of the difference between the height of the geocentric rectangular coordinate of the initial monitoring point after the geodetic coordinate conversion and the height of the geocentric rectangular coordinate of the initial monitoring point on the ground after the projection coordinate conversion0The specific calculation formula is as follows:
h0＝|ZA-ZG|。
determining a second difference h according to the absolute value of the difference between the height of the geocentric rectangular coordinate after the processed geodetic coordinate conversion and the height of the geocentric rectangular coordinate after the initial monitoring point is subjected to the projection coordinate conversion on the groundpThe specific calculation formula is as follows:
hp＝|Zp-ZG|。
s104: and judging whether the power overhead line has galloping or not according to the difference between the calculated elevation initial value of the sag monitoring point from the ground and the elevation monitoring value of the sag monitoring point from the ground, and outputting a judgment result.
Referring to fig. 3, specifically, every 10 minutes,calculating the longitude standard deviation, the latitude standard deviation and the height standard deviation (L) of the sag monitoring point of the power overhead line according to the processed geodetic coordinatesσ，Bσ，Hσ)、hpAnd sending the sum of the time to a remote master station, and judging whether the overhead power line swings every 10 minutes.
Calculating a second difference h of every 10 minutespAnd a first difference h0The difference Δ h of (d) is calculated as follows:
Δh＝|hp-h0|；
observing the change trend of delta h, if a third difference delta h is larger than a threshold value, judging that the overhead power line has galloping, wherein the threshold value is 5% of a first difference value, if the third difference is larger than the threshold value, early warning is carried out, the overhead power line is judged to have galloping, a certain droop possibly exists in a lead, furthermore, the heights of N groups of periodically acquired overhead power line sag monitoring points before the galloping of the overhead power line are acquired according to the time point when the third difference is larger than the threshold value, the absolute value and the integral mean value between every two of the heights of the N groups of periodically acquired overhead power line sag monitoring points are calculated, the maximum absolute value between every two absolute values is acquired, if the maximum absolute value is larger than 10% of the mean value, false early warning is judged, if the maximum absolute value is smaller than or equal to 10% of the mean value, the overhead power line is judged to have galloping and the line sag trend, attention should be paid to.
According to the embodiment of the application, through the obtained high-precision positioning data of the Beidou positioning module, the processed geodetic coordinates and standard deviation are calculated through preprocessing a plurality of groups of positioning data. And on the basis, the elevation of the arc sag point of the line from the ground is calculated, and whether the hidden danger of fastener loosening exists in the line is judged through analysis of difference values and the like. The problem of large monitoring fluctuation is solved through data preprocessing, and the stability and effectiveness of line sag elevation monitoring are further improved.
Referring to fig. 4, an embodiment of the present invention provides a terminal device, including:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method for overhead power line sag elevation monitoring as described above.
The processor is used for controlling the overall operation of the computer terminal equipment so as to complete all or part of the steps of the power overhead line sag elevation monitoring method. The memory is used to store various types of data to support the operation at the computer terminal device, which data may include, for example, instructions for any application or method operating on the computer terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.
In an exemplary embodiment, the computer terminal Device may be implemented by one or more Application Specific 1 integrated circuits (AS 1C), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor or other electronic components, for performing the above-mentioned overhead power line sag elevation monitoring method and achieving the technical effects consistent with the above-mentioned methods.
In another exemplary embodiment, there is also provided a computer readable storage medium comprising a computer program which, when executed by a processor, performs the steps of the overhead power line sag elevation monitoring method of any of the above embodiments. For example, the computer readable storage medium may be the memory described above including program instructions executable by the processor of the computer terminal device to perform the method for sag elevation monitoring of an electrical overhead line described above, and to achieve technical effects consistent with the method described above.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A method for monitoring the elevation of an sag point of an overhead power line is characterized by comprising the following steps:
the method comprises the steps that an optical theodolite is adopted to determine the geodetic coordinates of an initial sag monitoring point of the power overhead line, the projection coordinates of the initial monitoring point on the ground and the geodetic coordinates of periodically acquired sag monitoring points of the power overhead line;
preprocessing the geodetic coordinates of the periodically acquired sag monitoring points of the overhead power line to acquire the processed geodetic coordinates;
calculating an initial elevation value of the sag monitoring point from the ground and an elevation monitoring value of the sag monitoring point from the ground in a geocentric rectangular coordinate system according to the geodetic coordinates of the initial monitoring point, the projection coordinates of the initial monitoring point on the ground and the processed geodetic coordinates;
and judging whether the power overhead line has galloping or not according to the difference between the calculated elevation initial value of the sag monitoring point from the ground and the elevation monitoring value of the sag monitoring point from the ground, and outputting a judgment result.
2. The overhead power line sag point elevation monitoring method of claim 1,
and respectively converting the geodetic coordinates of the initial monitoring points, the projection coordinates of the initial monitoring points on the ground and the processed geodetic coordinates into corresponding geocentric rectangular coordinates, wherein the conversion formula is as follows:
Figure FDA0003309044940000011
Figure FDA0003309044940000012
Figure FDA0003309044940000013
in the formula (X)A,YA,ZA) Representing the transformed geocentric rectangular coordinates of the geodetic coordinates of the initial monitoring point, wherein XA,YA,ZARespectively representing the longitude, latitude and height of the geocentric rectangular coordinate after the geodetic coordinate conversion of the initial monitoring point, (X)G,YG,ZG) Representing the transformed geocentric rectangular coordinates of the projection coordinates of the initial monitoring point on the ground, wherein XG,YG,ZGRespectively representing longitude, latitude and height of geocentric rectangular coordinates after the transformation of projection coordinates of the initial monitoring point on the ground, (X)P,YP,ZP) Representing the processed transformed geocentric rectangular coordinates of the geodetic coordinate, wherein XP,YP,ZPRespectively representing the longitude, latitude and height of the processed geocentric rectangular coordinate after geodetic coordinate conversion, NA,NG,NPAnd the curvature radius of the prime monitoring point, the projection point of the prime monitoring point on the ground and the processed prime coordinate reference ellipse are respectively represented.
3. The overhead power line sag point elevation monitoring method of claim 2,
acquiring an initial elevation value of the sag monitoring point from the ground according to the difference value of the geodetic coordinates of the initial monitoring point and the geocentric rectangular coordinates of the initial monitoring point after the projection coordinates of the initial monitoring point on the ground are converted;
and acquiring an elevation monitoring value of the sag monitoring point from the ground according to the calculated difference value of the processed geodetic coordinate and the geocentric rectangular coordinate of the initial monitoring point after the projection coordinate of the sag monitoring point on the ground is converted.
4. The overhead power line sag elevation monitoring method according to claim 3, further comprising:
determining an initial elevation value of the sag monitoring point from the ground as a first difference value according to an absolute value of a difference value between the height of the geocentric rectangular coordinate of the initial monitoring point after the geodetic coordinate conversion and the height of the geocentric rectangular coordinate of the initial monitoring point on the ground after the projection coordinate conversion;
determining an elevation monitoring value of the sag monitoring point from the ground as a second difference value according to the absolute value of the difference value between the height of the geocentric rectangular coordinate after the geodetic coordinate conversion and the height of the geocentric rectangular coordinate after the projection coordinate of the initial monitoring point on the ground is converted;
and determining the difference between the initial elevation value of the sag monitoring point from the ground and the elevation monitoring value of the sag monitoring point from the ground as a third difference according to the absolute value of the difference between the first difference and the second difference.
5. The method for monitoring the sag elevation of the overhead power line according to claim 4, wherein the step of judging whether the overhead power line swings or not and outputting the judgment result comprises the following steps:
if the third difference is larger than 5% of the first difference, early warning is carried out and the electric overhead line is judged to have galloping;
further, the heights of N groups of periodically acquired sag monitoring points of the power overhead line before the power overhead line gallows are acquired according to the time point when the third difference value is greater than 5% of the first difference value, the absolute value and the integral mean value between any two groups of the heights of the periodically acquired sag monitoring points of the power overhead line are calculated, and the maximum absolute value between any two groups of the absolute values is acquired;
if the maximum absolute value is larger than 10% of the overall average value, judging that the early warning is false;
and if the maximum absolute value is less than or equal to 10% of the overall average value, judging that the overhead power line has galloping and line droop tendency.
6. The method for monitoring the sag elevation of the overhead power line according to claim 1, wherein the acquiring the processed geodetic coordinates specifically comprises:
in a preset period, calculating the longitude average value L in geodetic coordinates of periodically acquired sag monitoring points of the power overhead linePAnd calculating the latitude average value B in the geodetic coordinates of the periodically acquired sag monitoring points of the power overhead linePAnd calculating the height average value H in the geodetic coordinates of the periodically acquired sag monitoring points of the power overhead linePObtaining said processed geodetic coordinates (L)P,BP,HP) The formula is as follows:
LP＝(L1+L2+...+LN)/N；
BP＝(B1+B2+...+BN)/N；
HP＝(H1+H2+...+HN)/N；
in the formula, N represents the group number of the geodetic coordinates of the periodically acquired sag monitoring points of the power overhead line.
7. The method for monitoring the elevation of the sag point of the overhead power line according to claim 1, wherein before calculating the initial elevation value of the sag monitoring point from the ground and the elevation monitoring value of the sag monitoring point from the ground in the rectangular coordinates of the earth center, the method further comprises:
and calculating the longitude standard deviation, the latitude standard deviation and the height standard deviation of the sag monitoring point of the overhead power line according to the processed geodetic coordinates.
8. The method for monitoring the elevation of the sag point of the power overhead line according to claim 7, wherein the method for calculating the longitude standard deviation, the latitude standard deviation and the elevation standard deviation of the sag monitoring point of the power overhead line according to the processed geodetic coordinates comprises the following steps:
Figure FDA0003309044940000031
Figure FDA0003309044940000032
Figure FDA0003309044940000033
in the formula, LσRepresents the standard deviation of longitude of the sag monitoring point of the power overhead line, BσLatitude standard deviation H of sag monitoring point of power overhead lineσHeight standard deviation L of sag monitoring point of power overhead linei,Bi,HiRespectively representing the longitude, the latitude and the height of the ith group of periodically acquired power overhead line sag monitoring points.
9. A computer terminal device, comprising:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the overhead power line sag elevation monitoring method of any of claims 1 to 8.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method for electrical overhead line sag elevation monitoring according to any one of claims 1 to 8.
CN202111212957.9A 2021-10-18 2021-10-18 Method, equipment and medium for monitoring elevation of sag point of electric overhead line Active CN113959402B (en)

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CN104535043A (en) * 2015-01-17 2015-04-22 国家电网公司 Power line safety distance measurement evaluation method based on smart phone
CN110031818A (en) * 2019-04-29 2019-07-19 中国南方电网有限责任公司超高压输电公司昆明局 Based on the transmission line of electricity of point cloud data to earth's surface clearance contour line extraction method
US20190301953A1 (en) * 2018-03-28 2019-10-03 Quanta Associates, L.P. Method and apparatus for determining line sag in a conductor span
CN112697084A (en) * 2020-12-11 2021-04-23 广东电网能源发展有限公司 Sag measurement method, system, device and medium based on sag measurement instrument

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104535043A (en) * 2015-01-17 2015-04-22 国家电网公司 Power line safety distance measurement evaluation method based on smart phone
US20190301953A1 (en) * 2018-03-28 2019-10-03 Quanta Associates, L.P. Method and apparatus for determining line sag in a conductor span
CN110031818A (en) * 2019-04-29 2019-07-19 中国南方电网有限责任公司超高压输电公司昆明局 Based on the transmission line of electricity of point cloud data to earth's surface clearance contour line extraction method
CN112697084A (en) * 2020-12-11 2021-04-23 广东电网能源发展有限公司 Sag measurement method, system, device and medium based on sag measurement instrument

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Application publication date: 20220121

Assignee: Guangdong Electric Power Communication Technology Co.,Ltd.

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Denomination of invention: A method, equipment, and medium for monitoring the sag point elevation of overhead power lines

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