CN106777560B - Method and system for testing full-line wind deflection angle distribution state of power transmission line - Google Patents
Method and system for testing full-line wind deflection angle distribution state of power transmission line Download PDFInfo
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Abstract
The invention provides a method for testing the distribution state of the full-line wind deflection angle of a power transmission line, which comprises the steps of obtaining each wind speed test point on the power transmission line and the corresponding wind speed; according to the wind speed of each wind speed test point, obtaining the wind load of each wind speed test point and the corresponding wind pressure uneven coefficient thereof; acquiring the number and the radius of the sub-conductors of each wind speed test point, and calculating the conductor wind pressure of each wind speed test point according to the number, the radius, the wind load and the wind pressure non-uniform coefficient of the sub-conductors of each wind speed test point; and acquiring the unit length weight of the sub-conductor of each wind speed test point, and acquiring the wind deflection angle of each wind speed test point according to the acquired unit length weight of the sub-conductor of each wind speed test point and the calculated wind pressure of the conductor of each wind speed test point. By implementing the method and the device, the wind deflection angle on the whole line of the power transmission line can be obtained, and the change monitoring of the wind deflection angle of the whole line is relatively accurate.
Description
Technical Field
The invention relates to the technical field of power transmission line detection, in particular to a method and a system for testing the full-line wind deflection angle distribution state of a power transmission line.
Background
The windage yaw flashover accidents frequently occur on the power transmission line, the distribution range is wide, and the severe threat is caused to the safe operation of the power grid. Therefore, in order to prevent the occurrence of the windage yaw flashover accident, it is necessary to monitor the windage yaw of each point of the power transmission line to determine the probability of the occurrence of the windage yaw flashover accident and to locate the position of the occurrence of the windage yaw flashover accident.
However, in the prior art, the windage yaw monitoring can only be realized by calculating the windage yaw angle of a large range or area of the power transmission line, but the windage yaw angle of the power transmission line on the whole line cannot be obtained, and because the whole line is long, two points which are too far apart bring deviation due to different wind speeds.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method and a system for testing the distribution state of the all-line wind deflection angle of a power transmission line, which can obtain the wind deflection angle on the all-line of the power transmission line, and realize relatively accurate monitoring of the change of the all-line wind deflection angle.
In order to solve the technical problem, an embodiment of the present invention provides a method for testing an all-line wind deflection angle distribution state of a power transmission line, where the method includes:
acquiring each wind speed test point on a power transmission line and the corresponding wind speed of each wind speed test point; the distance between two adjacent wind speed test points is within a preset distance range;
obtaining the wind load of each wind speed test point according to the obtained wind speed corresponding to each wind speed test point, and further obtaining the wind pressure uneven coefficient of each wind speed test point from a preset wind pressure uneven coefficient table;
determining the number and the radius of the sub-conductors of each wind speed test point, and further calculating the conductor wind pressure of each wind speed test point according to the determined number and radius of the sub-conductors of each wind speed test point, the obtained wind load of each wind speed test point and the corresponding wind pressure non-uniform coefficient;
and acquiring the unit length weight of the sub-conductor of each wind speed test point, and acquiring the wind deflection angle of each wind speed test point according to the acquired unit length weight of the sub-conductor of each wind speed test point and the calculated wind pressure of the conductor of each wind speed test point.
Wherein the preset distance range is [4 meters, 16 meters ].
Wherein, the inhomogeneous coefficient table of preset wind pressure specifically includes:
when v is less than 10 m/s, the uneven coefficient of the wind pressure is 1; wherein v is the wind speed of each wind speed test point;
when v is less than or equal to 10 m/s<At 20 m/s, the wind pressure non-uniformity coefficient is
When v is more than or equal to 20 m/s, the uneven coefficient of the wind pressure is 0.61.
The embodiment of the invention also provides a system for testing the distribution state of the full-line wind drift angle of the power transmission line, which comprises the following steps:
the wind speed acquisition unit is used for acquiring each wind speed test point on the power transmission line and the corresponding wind speed of each wind speed test point; the distance between two adjacent wind speed test points is within a preset distance range;
the wind load and wind pressure coefficient acquisition unit is used for acquiring the wind load of each wind speed test point according to the acquired wind speed corresponding to each wind speed test point and further acquiring the wind pressure uneven coefficient of each wind speed test point from a preset wind pressure uneven coefficient table;
the wire wind pressure calculation unit is used for determining the number and the radius of the sub-wires of each wind speed test point, and further calculating the wire wind pressure of each wind speed test point according to the determined number and the radius of the sub-wires of each wind speed test point, the obtained wind load of each wind speed test point and the corresponding wind pressure uneven coefficient;
and the wind deflection angle calculation unit is used for acquiring the unit length weight of the sub-conductor of each wind speed test point and obtaining the wind deflection angle of each wind speed test point according to the acquired unit length weight of the sub-conductor of each wind speed test point and the calculated wind pressure of the conductor of each wind speed test point.
Wherein the preset distance range is [4 meters, 16 meters ].
Wherein, the inhomogeneous coefficient table of preset wind pressure specifically includes:
when v is less than 10 m/s, the uneven coefficient of the wind pressure is 1; wherein v is the wind speed of each wind speed test point;
when v is less than or equal to 10 m/s<At 20 m/s, the wind pressure non-uniformity coefficient is
When v is more than or equal to 20 m/s, the uneven coefficient of the wind pressure is 0.61.
The embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the wind speed distribution of the whole line is obtained by obtaining the wind speed of each wind speed test point of the whole line of the power transmission line, and the wind deflection angle of each point of the whole line is calculated according to the logical relationship between the wind speed and the wind deflection angle, so that the wind deflection angle of the whole line of the power transmission line can be obtained, the change monitoring of the wind deflection angle of the whole line is more accurate, and the method has an important guiding function on the prevention and treatment of the wind deflection flashover accident.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a flowchart of a method for testing an all-line wind deflection angle distribution state of a power transmission line according to an embodiment of the present invention;
fig. 2 is an application scene diagram of a full-line wind speed test point of a power transmission line in a state of testing full-line wind drift angle distribution of the power transmission line according to an embodiment of the present invention;
FIG. 3 is a wind speed curve distribution diagram of each wind speed test point in FIG. 2 at a certain time;
fig. 4 is a schematic structural diagram of a system for testing an all-line wind deflection angle distribution state of a power transmission line according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment of the present invention, a method for testing an all-line wind deflection angle distribution state of a power transmission line is provided, where the method includes:
s1, acquiring each wind speed test point on the power transmission line and the corresponding wind speed of each wind speed test point; the distance between two adjacent wind speed test points is within a preset distance range;
the specific process is that each wind speed test point is marked on the whole line of the power transmission line, a corresponding position relation and a corresponding wind speed size are given, and the distance between two adjacent wind speed test points is within a preset distance range, such as [4 m, 16 m ], so that the wind speed is in a uniform state within the preset distance range, and errors caused by long-distance wind speed difference are avoided.
In one embodiment, as shown in fig. 2, after each wind speed test point is divided on the whole transmission line and the corresponding wind speed is given, a curve distribution diagram as shown in fig. 3 is formed.
Step S2, obtaining the wind load of each wind speed test point according to the obtained wind speed corresponding to each wind speed test point, and further obtaining the wind pressure uneven coefficient of each wind speed test point from a preset wind pressure uneven coefficient table;
the specific process is that according to the respective corresponding wind speed of each wind speed test point, the wind load of each wind speed test point is obtained through a formula (1):
w＝g*v2/16 (1)；
in the formula (1), w is the wind load of the current wind speed test point, g is the gravity acceleration, 9.8 meters per square second, and v is the wind speed of the current wind speed test point;
according to the respective corresponding wind speed of each wind speed test point, further in a preset wind pressure uneven coefficient table, the wind pressure uneven coefficient α of each wind speed test point is obtained, and the specific steps are as follows:
when v is less than 10 m/s, the wind pressure uneven coefficient α is 1;
when v is less than or equal to 10 m/s<At 20 m/s, the wind pressure unevenness coefficient α is
When v is more than or equal to 20 m/s, the wind pressure uneven coefficient α is 0.61.
S3, determining the number and radius of the sub-conductors of each wind speed test point, and further calculating the conductor wind pressure of each wind speed test point according to the determined number and radius of the sub-conductors of each wind speed test point, the obtained wind load of each wind speed test point and the corresponding wind pressure uneven coefficient;
the specific process is that the number n and the radius r of the sub-conductors of each wind speed test point are determined, and according to the number n, the radius r, the wind load w and the wind pressure uneven coefficient α of the sub-conductors of each wind speed test point, the conductor wind pressure of each wind speed test point is obtained through a formula (2):
sp＝1.1*α*2*n*r*w (2)；
in the formula (2), sp is the wire wind pressure of the current wind speed test point.
And S4, acquiring the unit length weight of the sub-conductor of each wind speed test point, and acquiring the wind deflection angle of each wind speed test point according to the acquired unit length weight of the sub-conductor of each wind speed test point and the calculated wind pressure of the conductor of each wind speed test point.
The specific process is that the unit length weight q of the sub-conductor of each wind speed test point is obtained, the wind deflection angle of each wind speed test point is obtained according to the unit length weight q of the sub-conductor of each wind speed test point and the wind pressure sp of the conductor of each wind speed test point through a formula (3), and therefore the wind deflection angle distribution state of the whole line of the power transmission line is obtained:
in the formula (3), θ is the wind deflection angle of the current wind speed test point.
As shown in fig. 4, in an embodiment of the present invention, a system for testing an all-line wind deflection angle distribution state of a power transmission line is provided, where the system includes:
the wind speed acquisition unit 210 is configured to acquire each wind speed test point on the power transmission line and a wind speed corresponding to each wind speed test point; the distance between two adjacent wind speed test points is within a preset distance range;
a wind load and wind pressure coefficient obtaining unit 220, configured to obtain a wind load of each wind speed test point according to the obtained wind speed corresponding to each wind speed test point, and further obtain a wind pressure uneven coefficient of each wind speed test point from a preset wind pressure uneven coefficient table;
the wire wind pressure calculation unit 230 is configured to determine the number of sub-wires and the radius of the sub-wires of each wind speed test point, and further calculate the wire wind pressure of each wind speed test point according to the determined number of sub-wires and radius of the sub-wires of each wind speed test point, and according to the obtained wind load of each wind speed test point and the corresponding wind pressure non-uniformity coefficient;
and the wind deflection angle calculation unit 240 is configured to obtain the unit length weight of the sub-conductor of each wind speed test point, and obtain the wind deflection angle of each wind speed test point according to the obtained unit length weight of the sub-conductor of each wind speed test point and the calculated wind pressure of the conductor of each wind speed test point.
Wherein the preset distance range is [4 meters, 16 meters ].
Wherein, the inhomogeneous coefficient table of preset wind pressure specifically includes:
when v is less than 10 m/s, the uneven coefficient of the wind pressure is 1; wherein v is the wind speed of each wind speed test point;
when v is less than or equal to 10 m/s<At 20 m/s, the wind pressure non-uniformity coefficient is
When v is more than or equal to 20 m/s, the uneven coefficient of the wind pressure is 0.61.
The embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the wind speed distribution of the whole line is obtained by obtaining the wind speed of each wind speed test point of the whole line of the power transmission line, and the wind deflection angle of each point of the whole line is calculated according to the logical relationship between the wind speed and the wind deflection angle, so that the wind deflection angle of the whole line of the power transmission line can be obtained, the change monitoring of the wind deflection angle of the whole line is more accurate, and the method has an important guiding function on the prevention and treatment of the wind deflection flashover accident.
It should be noted that, in the foregoing system embodiment, each included system unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (4)
1. A method for testing the distribution state of the full-line wind deflection angle of a power transmission line is characterized by comprising the following steps:
acquiring each wind speed test point on a power transmission line and the corresponding wind speed of each wind speed test point; the distance between two adjacent wind speed test points is within a preset distance range;
obtaining the wind load of each wind speed test point according to the obtained wind speed corresponding to each wind speed test point, and further obtaining the wind pressure uneven coefficient of each wind speed test point from a preset wind pressure uneven coefficient table;
determining the number and the radius of the sub-conductors of each wind speed test point, and further calculating the conductor wind pressure of each wind speed test point according to the determined number and radius of the sub-conductors of each wind speed test point, the obtained wind load of each wind speed test point and the corresponding wind pressure non-uniform coefficient;
acquiring the unit length weight of the sub-conductor of each wind speed test point, and acquiring the wind deflection angle of each wind speed test point according to the acquired unit length weight of the sub-conductor of each wind speed test point and the calculated wind pressure of the conductor of each wind speed test point;
wherein the preset distance range is [4 meters, 16 meters ].
2. The method according to claim 1, wherein the preset wind pressure uneven coefficient table specifically comprises:
when v is less than 10 m/s, the uneven coefficient of the wind pressure is 1; wherein v is the wind speed of each wind speed test point;
when v is less than or equal to 10 m/s<At 20 m/s, the wind pressure non-uniformity coefficient is
When v is more than or equal to 20 m/s, the uneven coefficient of the wind pressure is 0.61.
3. The utility model provides a system for test transmission line full line wind declination distribution state which characterized in that, the system includes:
the wind speed acquisition unit is used for acquiring each wind speed test point on the power transmission line and the corresponding wind speed of each wind speed test point; the distance between two adjacent wind speed test points is within a preset distance range;
the wind load and wind pressure coefficient acquisition unit is used for acquiring the wind load of each wind speed test point according to the acquired wind speed corresponding to each wind speed test point and further acquiring the wind pressure uneven coefficient of each wind speed test point from a preset wind pressure uneven coefficient table;
the wire wind pressure calculation unit is used for determining the number and the radius of the sub-wires of each wind speed test point, and further calculating the wire wind pressure of each wind speed test point according to the determined number and the radius of the sub-wires of each wind speed test point, the obtained wind load of each wind speed test point and the corresponding wind pressure uneven coefficient;
the wind deflection angle calculation unit is used for acquiring the unit length weight of the sub-conductor of each wind speed test point and obtaining the wind deflection angle of each wind speed test point according to the acquired unit length weight of the sub-conductor of each wind speed test point and the calculated wind pressure of the conductor of each wind speed test point;
wherein the preset distance range is [4 meters, 16 meters ].
4. The system of claim 3, wherein the preset wind pressure non-uniformity coefficient table specifically comprises:
when v is less than 10 m/s, the uneven coefficient of the wind pressure is 1; wherein v is the wind speed of each wind speed test point;
when v is less than or equal to 10 m/s<At 20 m/s, the wind pressure non-uniformity coefficient is
When v is more than or equal to 20 m/s, the uneven coefficient of the wind pressure is 0.61.
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| US20140163884A1 (en) * | 2012-12-10 | 2014-06-12 | Universite De Liege | Method and system for the determination of wind speeds and incident radiation parameters of overhead power lines |
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| CN101907456A (en) * | 2010-06-30 | 2010-12-08 | 华南理工大学 | Method for calculating thickness and weight of ice coating on overhead transmission line of tangent tower |
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