CN110429514A - Automatic sag detection and wire tightening system for overhead transmission line - Google Patents

Abstract

The invention discloses an automatic sag detection and wire-tightening system for overhead transmission lines, comprising a wireless remote control trolley that is arranged on a wire to be measured, and a satellite receiving device for receiving position information sent by a satellite positioning system is arranged on the wireless remote control trolley; A wireless communication system is set on the wireless remote control car; a tight wire actuator for retracting and releasing wires; a control station on the ground; the control station sends a movement command and transmits it to the wireless remote control car through the wireless communication system, and controls the wireless remote control car to move to the test position; wireless remote control The trolley obtains the position information and transmits it to the control station; the control station calculates the sag value after processing the position information at the position to be measured, after comparing the calculated sag value with the target sag in the control station, the control station sends the line tightening command Control the wire-tightening actuator to retract and unwind the wire. The invention realizes real-time automatic on-line detection of wire sag and automatic wire tightening, and can also be used for more refined re-measurement of wires that have been tightened at the construction site.

Description

Automatic Sag Detection and Tightening System for Overhead Transmission Lines

technical field

The invention relates to an automatic sag detection and wire tightening system for overhead transmission lines, and belongs to the technical field of electric power construction engineering.

Background technique

Overhead transmission lines are the main artery of the power industry and an important part of the power system. Transmission line conductors sag between adjacent towers to form arc-shaped curves, and the sag range is called sag. The size of the sag is related to the span, height difference, wire length, wire weight, and wire stress. Natural factors such as temperature, wind, ice and snow also affect it. It is an important process to ensure the construction quality to accurately observe the sag of the overhead transmission line and guide the tightening operation until the target sag is reached.

The basic theory on which the conductor sag calculation of overhead lines is based is very mature. Due to the large distance between the two suspension points of the wire, the rigidity of the wire material has little effect on the geometry of the wire suspended in the air, so it can be assumed to be a flexible chain hinged everywhere, in line with the "catenary" formula. Based on this theoretical approximation, for an aerial wire, the shape of the wire can be determined and the sag of the wire can also be deduced only by given the coordinates of two hanging points of the wire and a point in the middle.

After the wire tightening operation is completed, if the deviation of the sag of the wire from the target value is too large, it will bring many harms to the operation of the subsequent transmission line: if the sag value is too small, the tensioned wire will have great stress, and if the temperature decreases, the wire will be damaged. Forced to stretch further or even break. Especially under the weather conditions of rain and snow disasters in the south, the tower is prone to lodging risk; if the sag value is too large, the safety distance for the object to be crossed is insufficient, and due to the continuous overvoltage of the system, high temperature and heavy load and other factors, the conductor will occur. Self-swinging, resulting in discharge between the wires and between the wires relative to the tower; under severe weather conditions such as strong winds and typhoons, the wires will swing beyond their allowable range, causing mutual whiplash damage between the wires and damage to the wires connected to the tower and broken strands .

In the construction process of domestic overhead transmission line conductors, the methods of artificial sag observation and manual tightening are used for each phase sub-conductor. The process of manual sag observation and wire tightening is: the lowest point of a wire is observed with the naked eye through the theodolite, and the sag is calculated and compared with the sag table given by the design. The sagging situation is communicated to the wire tightening personnel in the distance, and the wire tightening personnel use actuators (such as grinders, lever hoists and other tools) to tighten or loosen the wire. In the general operation process, the sag of the wire can be adjusted to the target range only through manual observation of the sag, information transmission, and back and forth of the tightening of the wire. On the one hand, manual observation of sag is easily limited by terrain, visibility conditions, etc., and the observation results directly depend on human factors such as the experience and knowledge of the observers, instrument operation skills, and the rigor of the operation process, which lacks consistency and authority. On the one hand, the manual tightening operation not only requires multiple personnel, but also consumes physical strength, has certain operation risks, and sometimes requires manual tower operation. The existing sag detection and line tightening process requires high environmental conditions for detection, and under the condition of poor visibility, manual observation of sag and line tightening cannot be carried out; manual line tightening requires more operators and is more difficult. The experience requirements of the observers are relatively high, and the requirements for on-site safety management are relatively high; the sag observers need to undergo systematic training to master the working methods of manual observation. At present, there is a shortage of experienced sag observers in the industry, and artificial The observed sag data lack objectivity and consistency.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings of the prior art that the sag detection and the wire tightening process are low in efficiency, the detection is affected by environmental factors, the requirements for detection personnel are relatively high, and there are certain operational risks, and an automatic arcing of overhead transmission lines is provided. Vertical detection and tightening system, the technical solutions are as follows:

Overhead transmission line automatic sag detection and wire tightening system,

It includes a wireless remote control trolley that is set on the wire to be tested, and the wireless remote control trolley is provided with a satellite receiving device for receiving the position information sent by the satellite positioning system; the wireless remote control trolley is equipped with a wireless communication system; a control station located on the ground;

The control station sends a movement command and transmits it to the wireless remote control car through the wireless communication system, and controls the wireless remote control car to move to the test position;

The wireless remote control car obtains the position information at the test position and transmits it to the control station through the wireless communication system;

The control station calculates the sag value after processing the position information at the position to be measured. After comparing the calculated sag value with the target sag in the control station, the control station sends a wire tightening command to control the wire tightening actuator to retract and unwind the wire.

Further, the wire-tightening actuator is connected with the controller for data transmission, and receives and unwinds the wire after receiving the wire-tightening command.

Preferably, the wire tightening actuator is wired to the controller.

Preferably, the wire tightening actuator is wirelessly communicated with the controller.

Further, the satellite positioning system is a high-precision Beidou high-tech satellite, providing multi-satellite signals.

Further, the wireless remote control trolley is provided with a high-precision positioning detection head for detecting the position information of the wireless remote control trolley.

Further, the control station also includes a man-machine interface for displaying the sag detection value of the current position of the wire.

Further, the control station includes a sag standard database query module and a data interface.

Further, the thread tightening actuator is a program-controlled thread tightening actuator.

Further, the position to be measured includes the suspension point of at least one end of the wire and the position of the midpoint of the wire.

Compared with the prior art, the beneficial effects achieved by the present invention:

The present invention performs real-time online detection on the wire sag of the overhead transmission line, calculates the current real-time sag value through the controller, calculates the difference between the sag value and the target sag value, and then adjusts the sag to the target through the wire tightening actuator Sag value, automatic sag detection and automatic wire tightening can also be used for more refined re-measurement of wires that have been tightened at the construction site.

Description of drawings

Figure 1 is a schematic diagram of the working principle of sag detection;

Fig. 2 is the sag detection flow chart of the present invention;

In the picture: 1-pole tower, 2-wire, 3-wireless remote control car, 31-satellite receiving device, 4-satellite positioning system, 5-control station, 6-tight wire actuator.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

As shown in Figure 1 and Figure 2, the automatic sag detection and wire tightening system for overhead transmission lines,

Including a wireless remote control car 3 that is arranged on the wire to be tested 2, the wireless remote control car 3 is provided with a satellite receiving device 31 for receiving the position information sent by the satellite positioning system 4; the wireless remote control car 3 is provided with a wireless communication system; The tightening line actuator 6; the control station 5 located on the ground;

The control station 5 transmits the movement command to the wireless remote control car 3 through the wireless communication system, and controls the wireless remote control car 3 to move to the test position;

The wireless remote control car 3 obtains the position information at the test position and transmits it to the control station 5 through the wireless communication system; During the construction and erection process, the sag of the wire 2 is continuously measured in real time, and the satellite receiving device 31 receives the satellite signal and obtains its own position information, ie, coordinate data.

The control station 5 calculates the sag value after processing the position information at the position to be measured, and after comparing the calculated sag value with the target sag in the control station 5, the control station 5 sends a tightening command to control the tightening actuator 6 to receive Lay out the wire. Calculate the sag value, that is, the current sag where the wire is located. The control station 5 obtains the difference between the calculated sag value and the target sag by comparing the calculated sag value, and sends the wire tightening command to the program-controlled tightening actuator 6 , tighten or loosen the wire 2, and finally make the calculated sag value consistent with the target sag.

Specifically, the wire-tightening actuator 6 is connected with the controller 5 for data transmission, and receives and unwinds the wire after receiving the wire-tightening instruction.

The wire-tightening actuator 6 is wirelessly transmitted with the controller 5 . Wireless transmission uses radio stations.

Specifically, the satellite positioning system 4 is a high-precision Beidou high-tech satellite, providing multi-satellite signals.

Specifically, the wireless remote control trolley 3 is provided with a high-precision positioning detection head for detecting the position information of the wireless remote control trolley 3 . To achieve the sag detection accuracy index, depending on the coordinate position accuracy that can be obtained by the detector head running with the wireless remote control car 3, centimeter-level accuracy can be achieved, which is sufficient to meet the requirements of wire 2 sag detection.

Specifically, the control station 5 also includes a man-machine interface for displaying the sag detection value of the current position of the wire 2 .

Specifically, the control station 5 includes a sag standard database query module and a data interface. The control station 5 is a portable and easy-to-use embedded computer software and hardware system suitable for construction sites. It can not only obtain the current sag by processing the data collected by the satellite positioning system 4, and send commands to control the tightening line actuator 6 to carry out automatic collection. For line tightening operations, the sag standard database query module facilitates the centralized control and standardization of construction operations. The complete set of products and technology of the present invention significantly promotes the process quality control and standardized operation of wireline construction.

Specifically, the thread tightening actuator 6 is a program-controlled thread tightening actuator.

Specifically, the position to be measured includes the suspension point of at least one end of the wire and the position of the midpoint of the wire 2 .

The sag detection process is as follows:

In the first sag detection method, the high-precision satellite receiving device 31 on the wireless remote control car 3 obtains the coordinate data of the suspension points at both ends of the wire 2, and then the control station 5 controls the satellite receiving device 31 to move with the wireless remote control car 3 to the wire. 2 At the midpoint of the horizontal projection direction, obtain the elevation data of the midpoint position, and then synthesize the elevation data of the two suspension points to process the measured position data through the internal software of the control station 5 to obtain the detection arc of the current wire 2. vertical value. If the wireless remote control trolley 3 deviates from the plane position, the control station 5 will transmit an instruction to the wireless remote control trolley 3 through the wireless communication system to make it walk and return to the position. The sag detection and wire tightening system of the present invention directly measures the relatively accurate sag value of the wire 2 without relying on the catenary calculation formula. The present invention can directly obtain the coordinate data of the position on the outline of the wire 2 through the satellite positioning system 4, and can be used to measure the sag and automatic tightening of the wire 2 in real time.

Another detection method is to improve the work efficiency of on-site sag detection. Only by obtaining the coordinate data of the single-ended suspension point of the conductor 2 and the actual measurement point in the middle of a certain conductor 2, combined with the design span of the conductor 2 in the control station 5 at the actual measurement point, and then using the catenary calculation formula To estimate the sag value, it is an indirect sag detection, but due to the high accuracy of the coordinate data of the measured point between the hanging point and the wire 2, the estimated sag data of the wire 2 is still better than the artificial sag data. observation.

The present invention realizes the automatic sag detection of the wire 2. After the control station 5, the wireless remote control car 3 and the satellite positioning system 4 complete the actual measurement or estimation of the sag, they are compared with the target sag pre-stored in the control station 5. If the sag of the current wire 2 is greater than the target sag, the tightening command is sent to the tightening actuator 6 for tightening; otherwise, the loosening command is sent to the tightening actuator for loosening. During the dynamic process of the wire tightening actuator 6, the control station 5 continues to detect and update the sag of the wire 2 until the currently measured sag matches the target sag. Real-time online detection of sag and tight line, and final adjustment to achieve the target sag value. The control station 5 also has a man-machine interface that displays the detection sag value of the current position of the wire 2 in real time, and by comparing the detection sag value with the target sag value, the internal program of the control station 5 controls the wire tightening actuator 6 to the wire. 2. Tighten or loosen to realize unmanned automatic tightening until the wire 2 reaches the target sag value. In actual use, the data communication between the wire tightening actuator 6 and the controller 5 can also be transmitted by wire.

At the same time, the system of the present invention can be used to carry out a more refined re-measurement of the wire 2 that has completed the wire tightening operation at the construction site: the wireless remote control car 3 walking on the wire 2 is equipped with a high-precision positioning detection head, and the high-precision The positioning probe continues to give the current coordinate data, and the wireless remote control car 3 walks the entire distance on the wire 2 to obtain the trajectory data of the entire wire 2, and the extended contour of the entire wire 2 can be drawn by curve fitting. .

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

1. the automatic arc sag detection of overhead transmission line and stringing system, which is characterized in that

Including the wireless remote control trolley being set on conducting wire to be measured of walking, the wireless remote control trolley, which is equipped with, receives satellite positioning The satellite receiver for the location information that system issues；Wireless communication system is set on the wireless remote control trolley；Folding and unfolding conducting wire Stringing actuator；Control station positioned at ground；

The control station issues move and is transmitted to the wireless remote control trolley by the wireless communication system, described in control Wireless remote control trolley is moved to test position；

The wireless remote control trolley obtains the location information at test position and is transmitted to by the wireless communication system described Control station；

The control station calculates sag value after treating the position information process at the location place of setting, by the calculating sag value and the control After target arc sag in system station is compared, the control station sends stringing instruction and controls the stringing actuator folding and unfolding conducting wire.

2. automatic arc sag detection according to claim 1 and stringing system, which is characterized in that the stringing actuator and institute Controller data transmission connection is stated, folding and unfolding conducting wire after the stringing instruction is received.

3. automatic arc sag detection according to claim 2 and stringing system, which is characterized in that the stringing actuator and institute State controller wire transmission.

4. automatic arc sag detection according to claim 2 and stringing system, which is characterized in that the stringing actuator and institute State controller wireless transmission.

5. automatic arc sag detection according to claim 1 and stringing system, which is characterized in that the global position system is High-precision Beidou high-tech satellite, provides more star signals.

6. automatic arc sag detection according to claim 1 and stringing system, which is characterized in that on the wireless remote control trolley Equipped with the high accuracy positioning detecting head for detecting the wireless remote control trolley location information.

7. automatic arc sag detection according to claim 1 and stringing system, which is characterized in that the control station further includes showing Show the man-machine interface of conducting wire current location arc sag detected value.

8. automatic arc sag detection according to claim 1 and stringing system, which is characterized in that the control station includes arc sag Standard database query module and data-interface.

9. automatic arc sag detection according to claim 1 and stringing system, which is characterized in that the stringing actuator is journey Control stringing actuator.

10. automatic arc sag detection according to claim 1 and stringing system, which is characterized in that the position to be measured includes The hitch point of at least one end of conducting wire and the midpoint of conducting wire.