CN111666705A - Finite element analysis-based lead sag detection method and system - Google Patents
Finite element analysis-based lead sag detection method and system Download PDFInfo
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- CN111666705A CN111666705A CN202010614938.8A CN202010614938A CN111666705A CN 111666705 A CN111666705 A CN 111666705A CN 202010614938 A CN202010614938 A CN 202010614938A CN 111666705 A CN111666705 A CN 111666705A
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- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/12—Measuring electrostatic fields or voltage-potential
- G01R29/14—Measuring field distribution
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Abstract
The invention relates to a wire sag detection method and a system based on finite element analysis, wherein the method comprises the following steps: establishing a model database and an electric field distribution database through finite element analysis software, wherein the model database comprises different types of electric transmission line models, and the electric field distribution database comprises a first electric field distribution curve graph corresponding to each type of electric transmission line model; collecting a second electric field distribution curve chart of the power transmission line to be detected by adopting an unmanned aerial vehicle loaded with electric field collecting equipment on the spot; and calculating the error of the first electric field distribution curve chart of the power transmission line model with the same type as the power transmission line to be detected and the error of the second electric field distribution curve chart of the power transmission line to be detected, judging that the conductor sag of the power transmission line to be detected is within a safety range if the errors are within a set range, and otherwise, judging that the conductor sag of the power transmission line to be detected exceeds the safety range. Compared with the prior art, the invention has the advantages of labor saving, high efficiency, good safety and the like.
Description
Technical Field
The invention relates to a power grid monitoring technology, in particular to a wire sag detection method and system based on finite element analysis.
Background
In recent years, the power industry in China is rapidly developed, and the requirements of people on the safety and reliability of a power system are higher and higher. The power transmission line is one of important components of the power system, and in order to ensure the safety and reliability of the power system, the sag of the power transmission line needs to be checked or monitored in real time. In the operation process of the power transmission line, the sag size of the overhead line is important information for reflecting whether the line has operation potential safety hazards. If the sag is too small, the tower can have accidents of wire breakage, tower falling, string falling and the like due to too large load; if the sag is too large, the wire is easy to be subjected to the action of wind force to generate waving influence to influence the distribution of electromagnetic fields under the wire, and the wire can also be contacted with trees, buildings and the like on the ground and discharge electricity, so that the circuit is tripped and powered off.
At present, the traditional methods for measuring the sag of the power transmission line comprise a manual inspection method, an inclination angle measuring method, a temperature measuring method, a laser ranging method, an image method and the like. The manual inspection method is complex in operation, consumes a large amount of manpower and material resources, and cannot achieve intelligent monitoring of the whole power transmission line. The dip angle measurement method and the temperature measurement method are greatly influenced by weather, the efficiency is low, and the laser distance measurement method and the image method have high requirements on the system, so that a simple and convenient method needs to be found for realizing sag detection of the power transmission line.
The prior art also provides some solutions, and chinese patent CN201810962221.5 proposes a sag monitoring system for power transmission line based on the measurement of electric field strength at the lowest position of sag and a monitoring method thereof, wherein the sag monitoring system comprises a signal acquisition unit, a signal transmission unit, a data processing unit, a central control unit, a storage unit, a display unit, a key input unit, an alarm unit and a communication unit; sag monitoring system calculates the sag size according to the change of the electric field strength of sag lowest position measurement, combines transmission line's working condition and real-time weather condition to judge whether normal is hung down to the transmission line sag, if abnormal, in time sends the warning through alarm unit, shows through the display element, uploads to surveillance center through communication unit, and this patent calculates real-time sag according to the change of sag lowest position ground electric field strength, improves the accuracy of sag monitoring.
However, the electric field intensity needs to be measured on the ground below the sag lowest position after the sag lowest position is manually determined, the terrain between towers is complex, the sag positions can change along with time, the whole line is difficult to traverse through manual detection, the measurement difficulty is high, errors caused by workload and subjective factors are large, meanwhile, due to the fact that the types of power transmission lines are multiple, the sag size is calculated according to the change of the electric field intensity measured at the sag lowest position, the calculated amount and the errors are large, whether the sag size exceeds a safety range or not needs to be judged according to experience after the sag size is calculated finally, errors caused by the subjective factors are large, and the sag size is not visual enough.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a conductor sag detection method and system based on finite element analysis, which are labor-saving, high in efficiency and good in safety.
The purpose of the invention can be realized by the following technical scheme:
a wire sag detection method based on finite element analysis comprises the following steps:
establishing a model database and an electric field distribution database of the power transmission line through finite element analysis software, wherein the model database comprises different types of power transmission line models, and the electric field distribution database comprises a first electric field distribution curve graph corresponding to each type of power transmission line model;
collecting a second electric field distribution curve chart of the power transmission line to be detected by adopting an unmanned aerial vehicle loaded with electric field collecting equipment on the spot;
and comparing the first electric field distribution curve diagram of the electric transmission line model corresponding to the electric transmission line to be detected with the second electric field distribution curve diagram of the electric transmission line to be detected, calculating the error of the electric field data, judging that the conductor sag of the electric transmission line to be detected is within a safety range if the error is within a set range, and otherwise, judging that the conductor sag of the electric transmission line to be detected exceeds the safety range.
Further, the power transmission line model comprises a voltage class and a loop type of the power transmission line, the voltage class comprises 220kV, 500kV and 1000kV, and the loop type of the power transmission line comprises a single loop power transmission line, a same-tower double-loop power transmission line and a same-tower four-loop power transmission line.
Further, the finite element analysis software obtains a first electric field distribution curve chart of the electric transmission line model by performing space electric field distribution analysis on the electric transmission line model.
Further, the collecting process of the second electric field distribution curve map specifically includes:
and collecting space electric field values on axial and radial paths at different distances from the power transmission line to be measured through the unmanned aerial vehicle.
Further, unmanned aerial vehicle on be equipped with the electromagnetic shield cover, prevent electromagnetic interference, unmanned aerial vehicle on be equipped with wireless transmission equipment, the last electric field collection equipment and the wireless transmission equipment of unmanned aerial vehicle are connected.
The utility model provides a wire sag detection system based on finite element analysis, includes finite element analysis module, model database, electric field distribution database, gathers module and safety analysis module on the spot:
the finite element analysis module is used for establishing different types of power transmission line models and a first electric field distribution curve chart corresponding to each type of power transmission line model through finite element analysis software;
the model database is used for storing the transmission line model;
the electric field distribution database is used for storing a first electric field distribution curve chart corresponding to each type of electric transmission line model;
the on-site acquisition module is used for acquiring a second electric field distribution curve chart of the power transmission line to be detected on site by adopting an unmanned aerial vehicle loaded with electric field acquisition equipment;
and the safety analysis module is used for calculating the error of the first electric field distribution curve chart of the electric transmission line model corresponding to the electric transmission line to be tested and the error of the second electric field distribution curve chart of the electric transmission line to be tested, judging that the conductor sag of the electric transmission line to be tested is in a safety range if the errors are in a set range, and otherwise judging that the conductor sag of the electric transmission line to be tested exceeds the safety range.
Further, the finite element analysis software obtains a first electric field distribution curve chart of the electric transmission line model by performing space electric field distribution analysis on the electric transmission line model.
Further, the collecting process of the second electric field distribution curve map specifically includes:
the space electric field values on the axial path and the radial path are collected at a plurality of different distances from the power transmission line to be measured through the unmanned aerial vehicle.
Further, unmanned aerial vehicle on be equipped with electromagnetic shield cover, avoid electromagnetic interference, unmanned aerial vehicle on be equipped with wireless transmission equipment, electric field collection equipment pass through wireless transmission equipment and be connected with safety analysis module.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention establishes a model database and an electric field distribution database of the power transmission line through finite element analysis software, wherein the electric field distribution database comprises a first electric field distribution curve chart corresponding to each type of power transmission line model, adopts an unmanned aerial vehicle with electric field acquisition equipment to acquire a second electric field distribution curve chart of the power transmission line to be measured on site, judging whether the conductor sag of the power transmission line to be tested is within a safety range or not through the error of the first electric field distribution curve chart and the second electric field distribution curve chart, can monitor the transmission line on the whole line, does not need field operation, saves labor, has wide application range because the model database comprises different types of transmission lines, meanwhile, the first electric field distribution curve graph and the second electric field distribution curve graph are compared, so that the result is visual, the calculation difficulty is low, the operation is simple, the efficiency is high, and the objectivity and the accuracy are good;
(2) according to the invention, the electromagnetic shielding cover is arranged on the unmanned aerial vehicle, so that electromagnetic interference is avoided;
(3) the wireless transmission equipment is arranged on the unmanned aerial vehicle, so that the unmanned aerial vehicle can be remotely controlled and data can be acquired, and the operation is convenient.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic diagram of unmanned aerial vehicle acquisition in the field;
fig. 3 is a schematic diagram of a drone acquisition location;
the reference numbers in the figures illustrate:
1. pole tower, 2, unmanned aerial vehicle, 3, the transmission line that awaits measuring.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
A wire sag detection method based on finite element analysis, as shown in fig. 1, 2 and 3, comprising:
establishing a model database and an electric field distribution database of the power transmission line through finite element analysis software, wherein the model database comprises different types of power transmission line models, the power transmission line models comprise a tower 1 and a standard power transmission line model, and the electric field distribution database comprises a first electric field distribution curve graph corresponding to each type of power transmission line model;
collecting a second electric field distribution curve chart of the power transmission line 3 to be detected on the spot by adopting an unmanned aerial vehicle 2 loaded with electric field collecting equipment;
and calculating the error between the first electric field distribution curve diagram of the electric transmission line model corresponding to the electric transmission line 3 to be tested and the second electric field distribution curve diagram of the electric transmission line 3 to be tested, if the error is within a set range, judging that the conductor sag of the electric transmission line 3 to be tested is within a safety range, and otherwise, judging that the conductor sag of the electric transmission line 3 to be tested exceeds the safety range.
And the finite element analysis software obtains a first electric field distribution curve chart of the electric transmission line model by carrying out space electric field distribution analysis on the electric transmission line model.
The power transmission line model comprises a voltage class and loop types of power transmission lines, the voltage class comprises 220kV, 500kV and 1000kV, and the loop types of the power transmission lines comprise a single loop power transmission line, a same-tower double-loop power transmission line and a same-tower four-loop power transmission line.
The acquisition process of the second electric field distribution curve graph specifically comprises the following steps:
the space electric field values on the axial path and the radial path are collected at different distances D from the power transmission line 3 to be measured through the unmanned aerial vehicle, wherein D is 0.5m, 1m and 2 m.
Unmanned aerial vehicle 2 is many rotor unmanned aerial vehicle, is equipped with the electromagnetic shield cover on unmanned aerial vehicle 2, prevents electromagnetic interference, is equipped with wireless transmission equipment on unmanned aerial vehicle 2, and the data of electric field collection equipment collection transmit the main website of carrying out electric field analysis through wireless transmission equipment.
Example 2
A wire sag detection system based on finite element analysis corresponding to embodiment 1, comprising a finite element analysis module, a model database, an electric field distribution database and a safety analysis module, wherein the finite element analysis module is used for establishing different types of electric transmission line models and a first electric field distribution curve corresponding to each type of electric transmission line model through finite element analysis software, the electric transmission line models comprise a tower 1 and a standard electric transmission line model, the model database is used for storing the electric transmission line models, the electric field distribution database is used for storing the first electric field distribution curve corresponding to each type of electric transmission line model, the on-site acquisition module is used for acquiring a second electric field distribution curve of the electric transmission line 3 to be detected on site by adopting an unmanned aerial vehicle loaded with electric field acquisition equipment, the safety analysis module is used for calculating errors between the first electric field distribution curve of the electric transmission line model corresponding to the electric transmission line 3 to be detected and the, if the error is within the set range, the conductor sag of the power transmission line 3 to be tested is judged to be within the safety range, otherwise, the conductor sag of the power transmission line 3 to be tested is judged to be beyond the safety range.
And the finite element analysis software obtains a first electric field distribution curve chart of the electric transmission line model by carrying out space electric field distribution analysis on the electric transmission line model.
The acquisition process of the second electric field distribution curve graph specifically comprises the following steps:
the space electric field values on the axial path and the radial path are collected at different distances D from the power transmission line 3 to be measured through the unmanned aerial vehicle, wherein D is 0.5m, 1m and 2 m.
Be equipped with the electromagnetic shield cover on unmanned aerial vehicle 2, prevent electromagnetic interference, be equipped with wireless transmission equipment on unmanned aerial vehicle 2, electric field collection equipment passes through wireless transmission equipment and is connected with safety analysis module.
Embodiment 1 and embodiment 2 provide a wire sag detection method and system based on finite element analysis, based on finite element computational analysis, can be applied to various types of transmission lines, carries electric field measurement module remote control measurement through unmanned aerial vehicle 2, no longer needs artifical tower-climbing measurement, and the security is high, and is efficient, has saved manpower and materials.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A wire sag detection method based on finite element analysis is characterized by comprising the following steps:
establishing a model database and an electric field distribution database through finite element analysis software, wherein the model database comprises different types of electric transmission line models, and the electric field distribution database comprises a first electric field distribution curve graph corresponding to each type of electric transmission line model;
collecting a second electric field distribution curve chart of the power transmission line to be detected by adopting an unmanned aerial vehicle loaded with electric field collecting equipment on the spot;
and calculating the error of the first electric field distribution curve chart of the power transmission line model with the same type as the power transmission line to be detected and the error of the second electric field distribution curve chart of the power transmission line to be detected, judging that the conductor sag of the power transmission line to be detected is within a safety range if the errors are within a set range, and otherwise, judging that the conductor sag of the power transmission line to be detected exceeds the safety range.
2. The finite element analysis-based wire sag detection method according to claim 1, wherein the finite element analysis software obtains the first electric field distribution curve of the electric transmission line model by performing spatial electric field distribution analysis on the electric transmission line model.
3. The finite element analysis-based wire sag detection method according to claim 1, wherein the acquisition process of the second electric field distribution curve map specifically comprises:
and collecting space electric field values on axial and radial paths at different distances from the power transmission line to be measured through the unmanned aerial vehicle.
4. The finite element analysis-based wire sag detection method according to claim 1, wherein an electromagnetic shield is arranged on the unmanned aerial vehicle.
5. The finite element analysis-based wire sag detection method according to claim 1, wherein a wireless transmission device is arranged on the unmanned aerial vehicle.
6. A wire sag detection system based on finite element analysis, comprising:
the finite element analysis module is used for establishing different types of power transmission line models and a first electric field distribution curve chart corresponding to each type of power transmission line model through finite element analysis software;
the model database is used for storing the transmission line model;
the electric field distribution database is used for storing a first electric field distribution curve chart corresponding to each type of electric transmission line model;
the on-site acquisition module is used for acquiring a second electric field distribution curve chart of the power transmission line to be detected on site by adopting an unmanned aerial vehicle loaded with electric field acquisition equipment;
and the safety analysis module is used for calculating the error between the first electric field distribution curve chart of the power transmission line model with the same type as the power transmission line to be detected and the second electric field distribution curve chart of the power transmission line to be detected, judging that the conductor sag of the power transmission line to be detected is within a safety range if the error is within a set range, and otherwise judging that the conductor sag of the power transmission line to be detected exceeds the safety range.
7. The wire sag detection system based on finite element analysis of claim 6, wherein the finite element analysis software obtains the first electric field distribution curve of the electric transmission line model by performing spatial electric field distribution analysis on the electric transmission line model.
8. The finite element analysis-based wire sag detection system according to claim 6, wherein the collection process of the second electric field distribution curve map is specifically as follows:
the space electric field values on the axial path and the radial path are collected at a plurality of different distances from the power transmission line to be measured through the unmanned aerial vehicle.
9. The finite element analysis-based wire sag detection system according to claim 6, wherein the unmanned aerial vehicle is provided with an electromagnetic shield.
10. The finite element analysis-based wire sag detection system according to claim 6, wherein the unmanned aerial vehicle is provided with a wireless transmission device, and the electric field acquisition device is connected with the safety analysis module through the wireless transmission device.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115201582A (en) * | 2022-09-15 | 2022-10-18 | 国网湖北省电力有限公司经济技术研究院 | High-voltage transmission electromagnetic radiation detection method and system |
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| CN102955088A (en) * | 2012-11-15 | 2013-03-06 | 云南电力试验研究院（集团）有限公司电力研究院 | Zero resistance insulator detection method on basis of finite element database |
| CN109084673A (en) * | 2018-08-22 | 2018-12-25 | 国网江苏省电力有限公司盐城供电分公司 | A kind of power transmission line sag monitoring system and its monitoring method based on arc sag extreme lower position electric field intensity measuremenrt |
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