Power transmission line disconnection prevention device with sag monitoring function and sag calculation method

Abstract

The invention discloses a power transmission line anti-dropping device with sag monitoring and a sag calculation method, the power transmission line anti-dropping device comprises a connecting piece and a bearing plate arranged at the end part of the connecting piece, the bearing plate is provided with three rotating shafts which are shaped like an inverted Chinese character'pin ', and a gap between the two rotating shafts at the upper part and the rotating shaft at the lower part is used for a power transmission line to pass through; the distance between the three rotating shafts is smaller than the outer diameter of the power transmission line so that the power transmission line can be stably clamped. A length measuring assembly fixed to the bearing plate is correspondingly arranged at the position, penetrating through the bearing plate, of the rotating shaft, and the length measuring assembly is in signal connection with a wireless transmission assembly fixedly arranged on the bearing plate. The objective of the invention is to solve the problem that a power transmission line is difficult to monitor in real time because a sag detection device in the prior art is greatly influenced by weather environment and consumes more resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission lines, in particular to a power transmission line anti-falling device with sag monitoring and a sag calculation method. BACKGROUND

[0002] Sag degree refers to the curved shape of the power transmission line on the support. This curved shape is the result of the combined action of the weight and tension of the power transmission line. The sag degree not only affects the reliability and stability of the power transmission network, but also directly affects the icing condition of the line, so the sag degree can provide accurate load capacity and safety margin analysis of the power transmission equipment, that is, provide a basis for power companies to develop a scientific and reasonable anti-icing and safety maintenance work plan.

[0003] The existing methods for calculating sag degree include the following two methods: 1. Using laser or light beam to project it onto the line, and then using a camera to take a picture, and then using image processing technology to analyze and process the image to determine the sag state and degree of the line; 2. GPS positioning method, using a device with GPS system to accurately position the tower or conductor, and calculating the shape and sag of the conductor in space through the distance difference between multiple points.

[0004] Whether it is through laser or through GPS positioning to measure the sag, it needs more electronic equipment and more energy consumption, and both methods are greatly affected by the weather environment, for example, in cloudy weather, the GPS is affected by the atmosphere and other environments, causing large data errors in positioning multiple small points, and then affecting the accurate calculation of the sag. In the case of strong or weak light environment, the shooting accuracy of the camera will also be affected, which will affect the subsequent image separation and processing, that is, the accurate calculation of the sag. Therefore, the existing two sag calculation methods are mostly periodic detection rather than monitoring, so it provides obstacles for workers to understand real-time data to determine power transmission line failures in advance and to provide timely maintenance and repair. At the same time, the existing sag detection device cannot provide temporary support when the power transmission line falls due to the failure of the support connecting piece, to reduce the economic loss and the possibility of personnel injury caused by the falling of the power transmission line. The economic loss is the damage to the corresponding ground equipment caused by the falling of the power transmission line, the subsequent repeated construction of the power transmission line and the damage to the power transmission line itself. The possibility of personnel injury is the risk of electric shock to ground personnel caused by high-voltage circuit contact with the ground, and the possibility of high-altitude falling of the power transmission line hitting personnel. SUMMARY

[0005] The purpose of the present application is to solve the problem that the sag detection device in the prior art is greatly affected by the weather environment, consumes more resources, and thus it is more difficult to monitor the power transmission line in real time, and to provide a power transmission line anti-falling device with sag monitoring and a sag calculation method.

[0006] In order to solve the above technical problems, the technical scheme adopted by the present application is: a power transmission line anti-falling device with sag monitoring, comprising a connecting piece and a bearing plate provided at the end of the connecting piece, three rotating shafts in the shape of an inverted character are provided on the bearing plate, and the gap between the upper two rotating shafts and the lower rotating shaft is provided for the power transmission line to pass through;

[0007] The distance between the three rotating shafts is less than the outer diameter of the power transmission line, so as to stably clamp the power transmission line;

[0008] The rotating shafts correspond to a length measurement component fixed on the bearing plate at the position where the rotating shafts pass through the bearing plate, and the length measurement component is signal connected with a wireless transmission component fixed on the bearing plate.

[0009] As a further optimization of the present application, the lower rotating shaft is rotatably arranged in a positioning hole opened below the bearing plate, the upper two rotating shafts pass through two sliding grooves opened on the bearing plate and are each fixed with a residual gear, the two residual gears are each meshed with a rack provided on the bearing plate, and when the two residual gears rotate quickly, the upper two rotating shafts can be driven to move to the end of the sliding groove to be limited by the sliding groove and approach each other to lock the power transmission line.

[0010] As a further optimization of the present application, the sliding groove is L-shaped, the longer section of the sliding groove is horizontally arranged, the horizontal section of the sliding groove corresponds to the rack, and the shorter section of the sliding groove is arranged in a bent manner.

[0011] As a further optimization of the present application, the bearing plate is fixedly connected with a support shaft at the center, the support shaft is fixed together with the end of the connecting fitting included in the connecting piece, and a reinforcing rib is arranged between the support shaft and the bearing plate.

[0012] As a further optimization of the present application, the connecting fitting is connected with the first connecting clamp or the second connecting clamp, and the first connecting clamp or the second connecting clamp can cooperate with the insulator string to connect the connecting fitting and the power transmission tower together.

[0013] As a further optimization of the present application, the first connecting clamp is an NY-type clamp, and the second connecting clamp is an NLD-type clamp.

[0014] As a further optimization of the power transmission line anti-drop device with sag monitoring of the application: the support shaft is connected with the upper two rotating shafts through a first stable plate, and an auxiliary groove matched with the rotating shaft is formed in the first stable plate, and a tension spring for tensioning the downward displacement of the upper rotating shaft is arranged in the auxiliary groove, and the support shaft is connected with the lower rotating shaft through a second stable plate.

[0015] As a further optimization of the power transmission line anti-drop device with sag monitoring of the application: three rollers are fixedly arranged on the outer circumferential surface of the end portion of the length measurement assembly away from the rotating shaft, and the rollers are V-shaped wheels.

[0016] A sag calculation method, comprising using any kind of power transmission line anti-drop device with sag monitoring to calculate the sag, and the calculation expression is as follows:

[0017] Wherein, f0 is the sag of the central lowest point of the power transmission line, L is the length between the adjacent two rollers, l1 is the actual length between the power transmission line and the adjacent two rollers, l2 is the total rotation amount of the lower roller measured by the length measurement assembly, and a is the error value.

[0018] As a further optimization of the sag calculation method of the application: the calculation expression of the total rotation amount l2 of the lower roller measured by the adjacent two length measurement assemblies is as follows: l2 = a1 + a2

[0019] Wherein, a1 is the roller rotation amount measured by one of the adjacent two length measurement assemblies, and a2 is the roller rotation amount measured by the other of the adjacent two length measurement assemblies.

[0020] Compared with the prior art, the application has the following beneficial effects:

[0021] The application sets three rotating shafts in inverted V shape and rollers, so that the lower roller and rotating shaft are closely combined with the power transmission line, and the elongation and shortening of the power transmission line due to environmental temperature factors drive the rotation of the lower rotating shaft and roller, and then the elongation and shortening of the power transmission line due to environmental temperature factors are measured based on the rotation amount of the lower rotating shaft, and then the sag can be calculated according to the corresponding measurement formula.

[0022] Further, the application sets the distance between the upper two rollers to be less than the minimum outer diameter of the power transmission line, so that when the power transmission line is dropped, the power transmission line is limited by the three rotating shafts, and the rotation and displacement of the upper two rotating shafts are limited by the ratchet wheel and the rack, and the three rotating shafts are close to each other to clamp the power transmission line, thereby realizing the anti-drop function of the power transmission line. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of the front view structure of the present application;

[0024] Figure 2 is a schematic view of the back view structure of the present application;

[0025] Figure 3 is a schematic view of the partial structure of the two use states of the present application;

[0026] Figure 4 is a schematic view of the structure of the first use state of the present application;

[0027] Figure 5 is a schematic view of the structure of the second use state of the present application;

[0028] Figure 6 is a schematic view of the structure of the sag calculation principle of the two use states of the present application;

[0029] In the figure, 1 is a bearing plate, 201 is a sliding groove, 202 is a positioning hole, 301 is a roller, 302 is a rotating shaft, 4 is a wireless transmission assembly, 5 is a length measurement assembly, 601 is a reinforcing rib, 602 is a supporting shaft, 603 is a first stabilizing plate, 604 is an auxiliary groove, 605 is a second stabilizing plate, 606 is a tension spring, 701 is a rack, 702 is a residual gear, 8 is a power transmission line, 9 is a connecting piece, 901 is a connecting fitting, 902 is a first connecting wire clamp, 903 is a second connecting wire clamp, 904 is an insulator string, and 10 is a power transmission tower. DETAILED DESCRIPTION

[0030] In order to better understand the present application, the content of the present application is further illustrated below in combination with examples, but the content of the present application is not limited to the following examples.

[0031] As Figures 1-3As shown, a power transmission line anti-falling device with sag monitoring includes a connecting piece 9 fixedly arranged on a power transmission tower 10, the connecting piece 9 is connected with a bearing plate 1, the bearing plate 1 is provided with three rotating shafts 302 in inverted V shape, a length measuring assembly 5 and a wireless transmission assembly 4, one end of each of the three rotating shafts 302 is fixedly provided with a roller 301, specifically, the roller 301 is provided as a V-shaped roller, thereby maintaining the limiting function of the roller 301 to the power transmission line 8, the power transmission line 8 passes between the three rollers 301, at the same time, the power transmission line 8 will be clamped due to the setting that the spacing between the three rollers 301 is smaller than the outer diameter of the power transmission line 8, and the power transmission line 8 can be tightly attached to the lower roller 301, the end of the lower rotating shaft 302 away from the corresponding roller 301 corresponds to the length measuring assembly 5, the length measuring assembly 5 can calculate the amount of rotation of the lower roller 301 due to the elongation and shortening of the power transmission line 8 affected by environmental factors, that is, the change value of the elongation and shortening of the corresponding end of the power transmission line 8 due to various environmental factors can be measured, then the data can be transmitted through the wireless transmission assembly 4, subsequently, the overall elongation and shortening change value of the power transmission line 8 can be obtained through the data transmission of the adjacent two wireless transmission assemblies 4, then the sag of the corresponding section of the power transmission line 8 can be obtained through the sag calculation method, thereby realizing real-time monitoring of the sag. Further, under the condition that the bending degree of the power transmission line 8 is allowed, the power transmission line 8 can be inserted in V shape from between the two upper rotating shafts 302, pass through the lower rotating shaft 302 and then pass out from between the two upper rotating shafts 302 again, and the power transmission line 8 away from the lower rotating shaft 302 is respectively overlapped on the two upper rotating shafts 302, so that the lower rotating shaft 302 can be more tightly attached to the power transmission line 8, that is, the change of the power transmission line 8 can be better reflected on the lower rotating shaft 302, and better buffering and clamping anti-falling effect can be provided.

[0032] And the center distance of the two upper rollers 301 is smaller than the outer diameter of the power transmission line 8, when the power transmission line 8 falls from the power transmission tower 10 due to the fracture of the power transmission line 8, the power transmission line 8 will be preliminarily buffered by the clamping of the three rollers 301, to assist in buffering the falling speed of the power transmission line 8, when part of the connecting piece 9 is fractured together with the power transmission line 8, the three rollers 301 can limit and lock to achieve the effect of anti-falling.

[0033] The lower rotating shaft 302 is rotationally connected in the positioning hole 202 opened in the bearing plate 1, and the upper two rotating shafts 302 are respectively rotationally connected in the sliding grooves 201 opened in the bearing plate 1. The two sliding grooves 201 are both arranged in an L shape, and the longer section of the sliding groove 201 is horizontally arranged as a horizontal section, and the shorter section of the sliding groove 201 is vertically arranged as a vertical section. Preferably, the vertical section is arranged in a curved manner to better limit the rotation and displacement of the corresponding rotating shaft 302. The bending parts of the two sliding grooves 201 are oppositely arranged, and the side of the bearing plate 1 away from the rollers 301 is fixedly provided with a rack 701 corresponding to the horizontal section of the sliding groove 201. The rack 701 is engaged with the toothless gear 702 provided on the upper two rotating shafts 302. When the connecting piece 9 fails, the power transmission line 8 will quickly slide under the action of gravity, and then drive the upper two rollers 301 to quickly rotate. The quick rotation of the upper two rollers 301 will drive the toothless gear 702 to quickly rotate through the corresponding two rotating shafts 302, and then push the corresponding two rotating shafts 302 to pass through the horizontal section of the sliding groove 201 into the downward vertical section under the support of the rack 701 to be limited, thereby shortening the distance between the two upper rollers 301 and the lower roller 301. Then the stability of the power transmission line being clamped and limited by the two rollers 301 can be improved. In normal use, the power transmission line 8 drives the upper two rollers 301 to rotate slightly and slowly, which will drive the toothless gear 702 to displace on the rack 701. However, due to the slow speed, when the toothless section of the toothless gear 702 contacts the rack 701, the power transmission line 8 will pull the two rollers 301 back to the original position, and will not enter the vertical section to affect the sliding of the roller 301 driven by the power transmission line 8. Specifically, a counterweight or a tension spring 606 can also be arranged on the rotating shaft 302 connected with the toothless gear 702, so that the rotating shaft 302 can stably enter the vertical section of the sliding groove 201 to be limited, that is, the upper two rotating shafts 302 stop rotating and press the power transmission line 8 tightly to lock the power transmission line 8 and achieve the purpose of preventing falling.

[0034] The connecting piece 9 includes a connecting fitting 901 connected with a support shaft 602 arranged at the center of the bearing plate 1. The connecting fitting 901 can connect the bearing plate 1 to the insulator string 9 by cooperating with the first connecting wire clamp 901 or the second connecting wire clamp 903. The insulator string 9 can be connected to the power transmission tower 10, thereby positioning the bearing plate 1 to the corresponding position of the power transmission tower 10. A plurality of reinforcing ribs 601 are arranged between the support shaft 602 and the bearing plate 1, thereby maintaining the connection stability of the bearing plate 1 and the connecting fitting 901. Specifically, as shown in Figure 4 and Figure 5 The first connecting wire clamp 901 or the second connecting wire clamp 903 is respectively an NY-type wire clamp and an NLD-type wire clamp. The connecting piece 9 can also be a steel cable connected insulator string, so that the bearing plate 1 is arranged at a position away from the power transmission tower 10 of the power transmission line 8 to perform higher-precision sag monitoring.

[0035] The support shaft 602 is rotationally connected with the two upper rotation shafts 302 with two first stable plates 603, and the first stable plate 603 is provided with an auxiliary groove 604 matched with the rotation shaft 302, the auxiliary groove 604 can enable the rotation shaft 302 to slide in the sliding groove 201 to avoid structural interference, and the auxiliary groove 604 can be provided with a tension spring 606 to enable the rotation shaft 302 to more quickly and stably enter after being rotated to be close to the vertical section included in the sliding groove 201, thereby realizing the locking of the upper rotation shaft 302, that is, better realizing the locking and falling prevention of the power transmission line 8. The support shaft 602 is connected with the lower rotation shaft 302 through a second stable plate 605, the first stable plate 603 and the second stable plate 605 can pull the rotation shaft 302 close to the support shaft 602, so that the three rollers 301 maintain the horizontal degree and the connection stability with the bearing plate 1, that is, the ability of the three rotation shafts 302 to bear the impact is maintained, and the synchronization and stability of the rollers 301 rotating with the displacement of the power transmission line are also maintained. Specifically, the length of the rotation shaft 302 on both sides of the two sliding grooves 201 and the positioning holes 202 is equal, thereby further maintaining the horizontal degree of the rotation shaft 302, further maintaining the ability of the three rotation shafts 302 to bear the impact, and further maintaining the synchronization and stability of the rollers 301 rotating with the displacement of the power transmission line.

[0036] The structure and shape of the length measurement assembly 5 and the wireless transmission assembly 4 for realizing the function of measurement transmission should be understood as prior art, and how the length measurement assembly 5 and the wireless transmission assembly 4 obtain power should also be understood as prior art, for example, the length measurement assembly 5 and the wireless transmission assembly 4 are internally provided with a battery, and power is obtained by using a solar self-power taking mode.

[0037] As shown in Figure 6 A sag calculation method, the expression of the sag calculation method is as follows:

[0038] f0 is the sag of the central lowest point of the power transmission line 8; L is the length between the two adjacent rollers 301; l1 is the actual length between the power transmission line 8 and the two adjacent rollers 301; l2 is the total rotation amount of the lower roller 301 measured by the length measurement assembly 5; and α is an error value.

[0039] The calculation expression of the total rotation amount l2 of the lower roller 301 measured by the two adjacent length measurement assemblies 5 is as follows: l2=a1+a2

[0040] a1 is the rotation amount of the roller 301 measured by one of the two adjacent length measurement assemblies 5; and a2 is the rotation amount of the roller 301 measured by the other of the two adjacent length measurement assemblies 5.

[0041] In actual calculation, the distance between two adjacent rollers 301, i.e. the horizontal distance L, is first measured by the corresponding device, then the actual length l1 of the power transmission line 8 between the two adjacent rollers 301 is measured, and after the measurement is completed, the measurement result is stored for use. Then, according to the total rotation amount l2 of the lower rollers 301 measured by the two adjacent length measurement assemblies 5, the following formula is inputted: The vertical sag f0 is calculated, and then the vertical sag is obtained.

[0042] The vertical sag calculation is to take the sag of the power transmission line 8 as a straight line, and to form a triangle with the vertical sag f0 and the distance between the two adjacent rollers 301, i.e. the horizontal distance L, and then to calculate the vertical sag by using the Pythagorean theorem. There is a certain error in the calculation process, so the error value α needs to be subtracted at last, wherein l2=a1+a2, a1 is the rotation amount of the roller 301 measured by one of the two adjacent length measurement assemblies 5, and a2 is the rotation amount of the roller 301 measured by the other of the two adjacent length measurement assemblies 5.

[0043] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, and various modifications or changes can be made by those skilled in the art within the scope of the claims, which do not affect the essential content of the present application.

Claims

1. A power line anti-drop device with sag monitoring, characterized in that: The utility model provides a kind of transmission line clamp, including connecting piece (9) and the load plate (1) of being located at the end of connecting piece (9), load plate (1) is equipped with three rotating shafts (302) in inverted triangle, the gap between upper two rotating shafts (302) and lower rotating shaft (302) is for power transmission line (8) to pass through; The interval between the three rotating shafts (302) is less than the outer diameter of the power transmission line (8) to stably clamp the power transmission line (8); The rotating shaft (302) passes through the length measuring assembly (5) corresponding to the load plate (1) fixed on the load plate (1), and the length measuring assembly (5) is signal connected with the wireless transmission assembly (4) fixed on the load plate (1).

2. A line-drop-out prevention device for a power transmission line with sag monitoring as claimed in claim 1, characterized in that: The lower rotating shaft (302) is rotatably arranged in the positioning hole (202) opened below the load plate (1), and the upper two rotating shafts (302) pass through the two sliding grooves (201) opened on the load plate (1) and are each fixedly provided with a residual gear (702), the two residual gears (702) are respectively engaged with the two racks (701) provided on the load plate (1), and when the two residual gears (702) rotate quickly, the upper two rotating shafts (302) can be driven to move to the end of the sliding groove (201) to be limited by the sliding groove (201) to approach each other to lock the power transmission line (8).

3. A catenary prevention device for power transmission lines with sag monitoring as claimed in claim 2 wherein: The sliding groove (201) is L-shaped, the longer section of the sliding groove (201) is horizontally arranged, the horizontal section of the sliding groove (201) corresponds to the rack (701), and the shorter section of the sliding groove (201) is a vertical section to limit the rotation and displacement of the upper two rotating shafts (302).

4. The catenary prevention device with sag monitoring of the electric transmission line according to claim 1, characterized in that: The load plate (1) is fixedly connected with the support shaft (602) at the center, the support shaft (602) is fixedly connected with the connecting fitting (901) included in the connecting piece (9), and the support shaft (602) is provided with the reinforcing rib (601) between the load plate (1).

5. A catenary prevention device for power transmission lines with sag monitoring as claimed in claim 4 wherein: The connecting fitting (901) is connected with the first connecting wire clamp (901) or the second connecting wire clamp (903), and the first connecting wire clamp (901) or the second connecting wire clamp (903) can cooperate with the insulator string (9) to connect the connecting fitting (901) and the power transmission tower (10) together.

6. A catenary prevention device for power transmission lines with sag monitoring as claimed in claim 5 wherein: The first connecting wire clamp (901) is an NY-type wire clamp, and the second connecting wire clamp (903) is an NLD-type wire clamp.

7. A catenary prevention device for power transmission lines with sag monitoring as claimed in claim 4 wherein: The support shaft (602) is connected with the upper two rotating shafts (302) through the first stabilizing plate (603), the first stabilizing plate (603) is provided with the auxiliary groove (604) matched with the rotating shaft (302), the auxiliary groove (604) is provided with the tension spring (606) for tensioning the upper rotating shaft (302) to displace downward, and the support shaft (602) is connected with the lower rotating shaft (302) through the second stabilizing plate (605).

8. A catenary prevention device for power transmission lines with sag monitoring as claimed in claim 1, wherein: The outer circumferential surface of the end of each of the three rotating shafts (302) away from the length measuring assembly (5) is fixedly provided with the roller (301), and the roller (301) is a V-shaped roller.

9. A method for sag calculation, comprising using the anti-dropping device for power transmission line with sag monitoring according to any one of claims 1-8 to calculate sag, characterized in that: The calculation expression is as follows: Wherein, f0 is the sag of the central lowest point of the power transmission line (8); L is the length between the two adjacent rollers (301); l1 is the actual length between the power transmission line (8) and the two adjacent rollers (301); l2 is the total rotation of the lower roller (301) measured by the length measuring assembly (5); and α is the error value.

10. The sag calculation method of claim 9, wherein: The calculation expression of the total rotation l2 of the lower roller (301) measured by the two adjacent length measuring assemblies (5) is as follows: l2 = a1 + a2 Wherein, a1 is the rotation of the roller (301) measured by one of the two adjacent length measuring assemblies (5); and a2 is the rotation of the roller (301) measured by the other of the two adjacent length measuring assemblies (5).

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