CN114353716A - Monitoring and evaluating method for crossed span sag of overhead transmission line - Google Patents
Monitoring and evaluating method for crossed span sag of overhead transmission line Download PDFInfo
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- CN114353716A CN114353716A CN202111409884.2A CN202111409884A CN114353716A CN 114353716 A CN114353716 A CN 114353716A CN 202111409884 A CN202111409884 A CN 202111409884A CN 114353716 A CN114353716 A CN 114353716A
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- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000012806 monitoring device Methods 0.000 claims abstract description 10
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Abstract
The invention discloses a monitoring and evaluating method for sag of crossing of an overhead transmission line.A microclimate environment monitoring device and a sag monitor are arranged on a tower at the crossing of the overhead transmission line to correspondingly monitor microclimate environment and sag; the microclimate environment monitoring device is provided with a wind speed monitor, a temperature and humidity monitoring sensor and an atmospheric pressure monitoring sensor, and is respectively used for monitoring wind speed, temperature and humidity and atmospheric pressure in real time; the sag monitor is installed at a wire suspension point, collects vertical observation angle values of a theodolite at the end of the rail, vertical intercept of a measurement point to a lower vertical line of the suspension point A, vertical intercept of the measurement point to a lower vertical line of the suspension point B, difference between two suspension points of an observation rail and span of the observation rail, and calculates sag. According to the invention, monitoring and evaluation of the cross spanning sag of the overhead transmission line are realized by monitoring meteorological environments such as wind speed, temperature and humidity and combining sag monitoring.
Description
Technical Field
The invention belongs to the technical field of power transmission line monitoring, and particularly relates to a power transmission line sag measurement technology.
Background
With the large-scale construction of the power transmission lines, more and more power transmission lines cross over high-speed railways, rivers, lakes and seas, expressways and power transmission lines with different voltage grades. In important crossover areas, the sag characteristics of the power conductors affect not only the safe distance to ground, but also the safe distance between crossing crossings. If the sag is too small, under the action of low temperature, ice and snow or wind power, the stress of a wire crossing a gear is increased, so that the accidents of vibration aggravation, short wire, strand breakage and the like are easily caused, meanwhile, the load of a tower is also increased, and the accidents of inclination and even collapse of the tower can be possibly caused. If the sag is too large, the conducting wire is easy to wave and jump, even twisted, and the interphase short circuit is caused. Meanwhile, the safety distance of the wire to trees, buildings and other spanning objects on the ground is insufficient, so that the wire can be discharged to the spanning objects and even cause the wire to trip. In addition, electromagnetic radiation generated by line discharge can also cause damage to people and livestock, and serious influence is brought to normal operation of the power transmission line.
Aiming at the research background, an important span gear sag monitoring device needs to be developed, environmental meteorological data such as air temperature, wind speed and wind direction and the like are monitored, the relation and the change rule of the conductor sag and the environmental meteorological data are analyzed, and the important significance is achieved for mastering the sag change rule of the power transmission conductor, improving the operation and maintenance level of the overhead power transmission line and reducing the operation and maintenance cost. The sag change prediction method based on probability statistics is provided by combining sag monitoring data, so that the sag change prediction capability of the crossing gear is improved, the line safety fault caused by insufficient safety distance is avoided, and the safe and stable operation of the overhead transmission line is effectively guaranteed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the technical problem of providing a method for monitoring and evaluating the cross spanning sag of the overhead transmission line by integrating the microclimate environment monitoring.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for monitoring and evaluating the crossed span sag of an overhead transmission line is characterized in that a micrometeorological environment monitoring device and a sag monitor are arranged on a tower at the crossed span of the overhead transmission line to correspondingly monitor the micrometeorological environment and the sag; the microclimate environment monitoring device is provided with a wind speed monitor, a temperature and humidity monitoring sensor and an atmospheric pressure monitoring sensor, and is respectively used for monitoring wind speed, temperature and humidity and atmospheric pressure in real time; the sag monitor is installed on a wire suspension point, collects vertical observation angle values of a theodolite at the end of the gear, the vertical intercept of a measurement point to a lower vertical line of the suspension point A, the vertical intercept of the measurement point to a lower vertical line of the suspension point B, the difference between two suspension points of an observation gear and the span of the observation gear, and calculates sag, wherein the sag calculation formula is as follows:
by trigonometric relationships
In the formula (I), the compound is shown in the specification,
theta is a vertical observation angle value of the theodolite at the gear end;
a-the vertical intercept, m, of the measurement point to the perpendicular line below the suspension point A;
b-the vertical intercept, m, of the measurement point to the lower vertical line of the suspension point B;
h is the difference between the two suspension points of the observation gear, m;
l-span of observation gear, m;
f-sag value of observation gear, m.
Preferably, the wind speed monitor is an ultrasonic anemometer; the temperature and humidity monitoring sensor is a digital temperature and humidity integrated sensor; the atmospheric pressure monitoring sensor is a silicon piezoresistive type barometric sensor.
Furthermore, the sag change trend is analyzed based on probability statistics by combining the conductor sag monitoring data and the meteorological monitoring data under the microenvironment at the crossed position of the overhead transmission line.
According to the technical scheme, the method for monitoring and evaluating the cross spanning sag of the overhead transmission line is combined with micro meteorological environment monitoring, the cross spanning sag of the overhead transmission line is monitored and evaluated through meteorological environment monitoring such as wind speed, temperature, humidity and atmospheric pressure and the like and combined with sag monitoring, and technical support is provided for safe operation and maintenance of cross spanning of the overhead transmission line.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
FIG. 1 is a schematic view of the installation positions of a microclimate environment monitoring device and a sag monitor;
FIG. 2 is a schematic diagram of a sag monitoring method.
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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
The invention relates to a method for evaluating the crossing sag of an overhead transmission line by integrating two modes of monitoring the crossing microclimate environment and monitoring the sag of the overhead transmission line. As shown in figure 1, in the method, a microclimate environment monitoring device 1 and a sag monitor 2 are installed on a tower at the crossing of an overhead transmission line to correspondingly monitor microclimate environment and sag.
The microclimate environment monitoring device is provided with a wind speed monitor, a temperature and humidity monitoring sensor and an atmospheric pressure monitoring sensor, and the wind speed monitor, the temperature and humidity monitoring sensor and the atmospheric pressure monitoring sensor are respectively used for monitoring wind speed, temperature and humidity in real time and monitoring air pressure.
The ultrasonic anemometer is adopted to monitor wind speed and wind direction, and the working principle is that the ultrasonic time difference method is utilized to realize the measurement of wind speed. The speed of sound in air is superimposed by the speed of air flow in the wind direction. If the propagation direction of the ultrasonic wave is the same as the wind direction, the speed of the ultrasonic wave is accelerated; conversely, if the propagation direction of the ultrasonic wave is opposite to the wind direction, its speed becomes slow. Therefore, under fixed detection conditions, the speed of the ultrasonic wave propagating in the air can correspond to the wind speed function. The accurate wind speed can be obtained through calculation.
When the ultrasonic wave is transmitted in the air, a speed difference exists between the downwind direction and the upwind direction, when the ultrasonic wave is transmitted for a fixed distance, the speed difference is reflected into a time difference, and the time difference has a linear relation with the wind speed to be measured.
For specific wind direction transmission, a pair of ultrasonic probes integrated with transmitting and receiving can be selected, the distance between the probes is ensured to be unchanged, the probes are fixed in opposite directions according to a plane in a specified direction, ultrasonic waves are transmitted in a fixed frequency sequence, the time of receiving the ultrasonic waves on the two probes is measured, the downwind transmission speed and the upwind transmission speed are obtained, and the wind speed value can be obtained through system processing and conversion.
A digital temperature and humidity integrated sensor is selected for temperature and humidity monitoring. The sensor combines a digitally output Relative Humidity (RH) sensor and a temperature sensor in one package.
The atmospheric pressure is measured by a silicon piezoresistive pressure sensor. The piezoresistive air pressure sensor is characterized in that air pressure acts on a small vacuumized box covered by a sensitive element, a resistor is under the action of compression or tensile stress through the small box, the change of the resistance value is known to be in direct proportion to the change of the air pressure through a pressure-resistance effect, and the air pressure is measured through measuring the resistance value.
Sag monitoring is to carry out sag monitoring on a suspension point of a lead supported by a sag monitor on an iron tower, collect vertical observation angle values of a theodolite at a gear end, a vertical intercept of a measurement point to a lower vertical line of a suspension point A, a vertical intercept of a measurement point to a lower vertical line of a suspension point B, a difference between two suspension points of an observation gear and a span of the observation gear, and carry out sag calculation, wherein the sag calculation formula is as shown in figure 2:
using catenary type, derived from trigonometric relationships
In the formula (I), the compound is shown in the specification,
theta is a vertical observation angle value of the theodolite at the gear end;
a-the vertical intercept, m, of the measurement point to the perpendicular line below the suspension point A;
b-the vertical intercept, m, of the measurement point to the lower vertical line of the suspension point B;
h is the difference between the two suspension points of the observation gear, m;
l-span of observation gear, m;
f-sag value of observation gear, m.
The two crossed wires are subjected to sag monitoring by adopting the method.
On the basis, a sag change trend method based on probability statistics is provided by combining important wire sag monitoring data and meteorological monitoring data under a micro-environment crossing. And then, the important crossing microclimate environment monitoring data is combined to realize the wire sag evaluation under the important crossing microenvironment.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (3)
1. The monitoring and evaluation method for the crossed span sag of the overhead transmission line is characterized by comprising the following steps of: installing a microclimate environment monitoring device and a sag monitor on a tower at the crossing of the overhead transmission line to correspondingly monitor microclimate environment and sag; the microclimate environment monitoring device is provided with a wind speed monitor, a temperature and humidity monitoring sensor and an atmospheric pressure monitoring sensor, and is respectively used for monitoring wind speed, temperature and humidity and atmospheric pressure in real time; the sag monitor is installed on a wire suspension point, collects vertical observation angle values of a theodolite at the end of the gear, the vertical intercept of a measurement point to a lower vertical line of the suspension point A, the vertical intercept of the measurement point to a lower vertical line of the suspension point B, the difference between two suspension points of an observation gear and the span of the observation gear, and calculates sag, wherein the sag calculation formula is as follows:
by trigonometric relationships
In the formula (I), the compound is shown in the specification,
theta is a vertical observation angle value of the theodolite at the gear end;
a-the vertical intercept, m, of the measurement point to the perpendicular line below the suspension point A;
b-the vertical intercept, m, of the measurement point to the lower vertical line of the suspension point B;
h is the difference between the two suspension points of the observation gear, m;
l-span of observation gear, m;
f-sag value of observation gear, m.
2. The overhead transmission line crossing sag monitoring and evaluation method according to claim 1, characterized in that: the wind speed monitor is an ultrasonic anemometer; the temperature and humidity monitoring sensor is a digital temperature and humidity integrated sensor; the atmospheric pressure monitoring sensor is a silicon piezoresistive type barometric sensor.
3. The overhead transmission line crossing sag monitoring and evaluation method according to claim 1, characterized in that: and analyzing the sag change trend based on probability statistics by combining the conductor sag monitoring data and the meteorological monitoring data under the microenvironment at the crossed position of the overhead transmission line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111409884.2A CN114353716A (en) | 2021-11-25 | 2021-11-25 | Monitoring and evaluating method for crossed span sag of overhead transmission line |
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| CN202111409884.2A CN114353716A (en) | 2021-11-25 | 2021-11-25 | Monitoring and evaluating method for crossed span sag of overhead transmission line |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292659A (en) * | 2013-05-02 | 2013-09-11 | 西安工程大学 | Electric transmission line conductor sag measuring method based on angle sensor |
| CN205333034U (en) * | 2016-01-19 | 2016-06-22 | 广州恒宗达电力科技有限公司 | Transmission line wire arc on -line monitoring system that hangs down |
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2021
- 2021-11-25 CN CN202111409884.2A patent/CN114353716A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292659A (en) * | 2013-05-02 | 2013-09-11 | 西安工程大学 | Electric transmission line conductor sag measuring method based on angle sensor |
| CN205333034U (en) * | 2016-01-19 | 2016-06-22 | 广州恒宗达电力科技有限公司 | Transmission line wire arc on -line monitoring system that hangs down |
Non-Patent Citations (2)
| Title |
|---|
| 杜清波;喻梅莺;: "架空输电线路交叉跨越距离检查及计算", 中国科技投资, no. 26 * |
| 黄海峰;: "浅议输电线路观测弧垂计算公式的应用与调整", 科技资讯, no. 18, pages 71 * |
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