High-voltage transmission line conductor insulation string wind deflection angle simulation test device

Abstract

The invention relates to a wind deflection angle simulation test device for a lead insulation string of a high-voltage transmission line, a sliding wire clamp is mounted at the bottom of the insulation string, and a lead is connected to the sliding wire clamp; the simulation test device comprises an inclinometer, an H-shaped hanger, a pulley structure and a mounting plate; the inclinometer is arranged on an insulating string, the H-shaped hanging rack is hinged to a hanging point, the two pulley structures are arranged at the bottom of the H-shaped hanging rack, the height of the two pulley structures can be adjusted up and down relative to the H-shaped hanging rack, and the mounting plates are arranged on the side faces of the pulley structures; the wire bypasses the pulleys of the two pulley structures, and the counterweight is hung at one end far away from the insulating string to simulate the vertical load of the wire; the mounting plate is used for applying a transverse pulling force to the pulley structure and simulating a transverse wind load borne by the wire; the device can test different transverse wind loads, suspension angles of different suspension conductors and conductor wind deflection angles under horizontal tension, and is of great significance in enhancing the bearing capacity of a power transmission tower and ensuring safe operation of a power grid.

Description

Technical Field

[0001] The invention relates to a high-voltage transmission line conductor insulation string wind deflection angle simulation test device, belonging to the field of conductor insulation string wind deflection angle testing. Background Art

[0002] Overhead transmission lines are the main mode of power transmission. With the increase of the voltage level of transmission lines, the safety issues of their engineering also arise. Wind deflection flashover phenomenon is one of the major safety hazards of transmission lines and frequently occurs in safety accidents. Wind deflection flashover phenomenon refers to the situation that under severe wind conditions, due to the insufficient stability of insulators and conductors, strong winds exert huge lateral loads on the conductors, resulting in excessive wind deflection angles on the insulator string and a reduction in the electrical clearance between the conductor and other nearby objects. When the gap cannot meet the requirements of the specification, discharge will occur, causing failures in the transmission line and directly affecting the normal operation of the power grid system. Therefore, the wind deflection angle information of the insulator string is an important indicator for analyzing the working status of the transmission line.

[0003] At present, there are two main methods for testing the wind deflection angle of transmission line conductors: one is to measure by installing an inclinometer on the suspended composite insulator string. This method can only install sensors on the non-charged part of the insulator string. When only the offset at the bottom of the insulator string is large, the insulator string is not close to the tower, so there is no wind deflection discharge phenomenon, which is easy to cause large errors and the test is not well prepared. The other method calculates the wind deflection angle using the wind deflection angle calculation formula based on the wind speed, wind direction, temperature, humidity and other parameters around the test insulator string. This method is limited by the sensor and calculation model, and the calculation model does not consider factors comprehensively, and there are certain errors. In addition, both of the above methods must be carried out on the tower of the actual transmission line. The test method is complicated and dangerous.

[0004] In UHV transmission line projects, the purpose of using V-shaped assembled insulator strings is to limit the swing angle of the insulator strings to the maximum extent, so as to reduce the size of the tower head and the width of the line corridor. In actual projects, due to the large displacement, non-rigid, and non-flexible stress characteristics of V-shaped insulator strings, their stress analysis is very complicated. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to provide a simulation test device which has a simple structure and is convenient for simulating the wind deflection angle of an insulation string.

[0006] In order to achieve the above-mentioned purpose, the technical solution proposed in the present invention is: a wind deflection angle simulation test device for an insulation string of a high-voltage transmission line conductor, a sliding wire clamp is installed at the bottom of the insulation string, and the conductor is connected to the sliding wire clamp; the simulation test device includes an inclinometer, an H-type hanger, a pulley structure and a mounting plate; the inclinometer is arranged on the insulation string, the H-type hanger is hinged on the hanging point, two pulley structures are arranged at the bottom of the H-type hanger, and the height can be adjusted up and down relative to the H-type hanger, and the mounting plate is arranged on the side of the pulley structure; the conductor passes around the pulleys of the two pulley structures, and a counterweight is hung at the end away from the insulation string to simulate the vertical load of the conductor; the mounting plate is used to apply lateral tension to the pulley structure to simulate the lateral wind load on the conductor.

[0007] The pulley structure includes a plurality of pulleys distributed up and down and connecting plates symmetrically arranged on both sides of the pulleys. The tops of the two connecting plates are connected to each other, and a telescopic rod is fixed at the connection. The pulley structure is connected to the H-shaped bracket through the telescopic rod, and the height is adjusted up and down relative to the H-shaped bracket, thereby adjusting the hanging angle of the wire.

[0008] A preferred solution of the above technical solution is: the telescopic rod at the top of the pulley structure is a screw rod, and screw holes are provided at the bottom of the H-shaped bracket and at the corresponding positions of the two pulley structures. The pulley structure is arranged at the bottom of the H-shaped bracket through the cooperation of the screw rod and the screw hole, and the height relative to the H-shaped bracket is adjusted by the length of the screw rod screwed into the screw hole.

[0009] The conductors are respectively wound around the bottom and top of two pulleys in the two pulley structures.

[0010] The conductor between the two pulley structures is arranged horizontally.

[0011] The top of the H-shaped hanger is connected to the hanging point through two hinge points and can swing relative to the hanging point, and the swing axis is located in the same plane as the central axis of the initial position of the insulation string and the initial setting direction of the conductor.

[0012] H-shaped hangers are respectively arranged on both sides of the insulating string, and the H-shaped hangers on both sides are connected to the pulley structure.

[0013] An inclinometer is respectively arranged at both ends of each insulator string of the insulation string.

[0014] The insulating string is a V-shaped insulating string or an L-shaped insulating string.

[0015] The V-shaped insulation string or L-shaped insulation string includes two insulator strings, two ends of the two insulator strings are respectively connected to two hanging points and an L-shaped connecting plate through connecting hardware, and the sliding wire clamp is connected to the L-shaped connecting plate.

[0016] The beneficial effects of the present invention are:

[0017] The present invention can simplify the measurement of the wind deflection angle of the transmission line conductor, is simple to operate, and produces accurate data; it can simulate the test of different lateral wind loads by applying lateral tension through the mounting plate, simulate the suspension angles of different suspended conductors by adjusting the height of the pulley, and simulate the horizontal tension of the conductor by adjusting the weight of the counterweight, thereby simulating the wind deflection angles of the conductor and the insulation string under the above-mentioned different states, which is of great significance for strengthening the carrying capacity of the transmission tower, preventing the wind deflection flashover problem of the line, and ensuring the safe operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a V-shaped insulating string for simulation testing of the present invention;

[0019] Figure 2 It is a schematic diagram of simulating lateral wind loads of an H-shaped hanger and a pulley in the simulation test device of the present invention;

[0020] Figure 3 This is a test structure diagram of the simulation test device of the present invention.

[0021] In the figure: 1-insulating string, 2-connecting hardware, 3-L-type connecting plate, 4-inclinometer, 5-suspension clamp, 6-H-type bracket, 7-counterweight, 8-pulley, 9-mounting plate, 10-connecting plate, 11-conductor. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Embodiment 1

[0024] The high-voltage transmission line conductor insulation string wind deflection angle simulation test device of this embodiment is used to simulate the insulation string of the test. Figure 1 As shown, a V-shaped insulating string 1 is shown. The insulating string 1 includes two insulator strings arranged symmetrically in a V shape. One end of the two insulator strings is connected to the left and right hanging points through a connecting hardware 2, and the other end of the two insulator strings is connected to an L-shaped connecting plate 3 to form a V-shaped structure. A sliding wire clamp 5 is installed at the lower end of the L-shaped connecting plate 3 for connecting the wire. By adjusting the distance between the left and right hanging points of the V-shaped insulating string 1 and the length of the two strings, different voltage levels and different internal and external angle configurations can be achieved. Inclinometers 4 are installed at the upper and lower ends of the two insulator strings for measuring angles.

[0025] like Figure 2 As shown, the simulation test device of this embodiment further includes an H-shaped bracket 6 for controlling the hanging angle of the conductor 11, a pulley structure arranged at the bottom of the H-shaped bracket 6, and a mounting plate 9 arranged on the side of the pulley structure.

[0026] Combination Figure 3As shown, the H-shaped hanger 6 is hinged on the hanging point, and the two pulley structures are connected to the bottom of the H-shaped hanger 6 through telescopic rods, and the height can be adjusted up and down relative to the H-shaped hanger 6. The wire is wound on the pulley 8 of the pulley structure. By adjusting the height of the pulley structure, the hanging angle of the wire 11 with different sags can be simulated. After the wire 11 passes through the pulleys 8 of the two pulley structures, a counterweight 7 is hung at the end away from the insulating string 1 to simulate the vertical load and horizontal tension of the wire; a lateral tension is applied to the pulley structure through the mounting plate 9 to simulate the lateral wind load on the wire 11. At this time, the inclination of the insulating string 1 can be measured by the inclinometer 4 on the insulating string 1, thereby simulating the wind deflection angle of the test wire 11 and the insulating string 1.

[0027] Embodiment 2

[0028] The structure of this embodiment is basically the same as that of the first embodiment, except that: Figure 3 As shown, two H-shaped brackets 6 are respectively installed on the front and rear sides of the insulating string 1 along the power transmission direction. Two parallel screw holes are arranged at the bottom of the H-shaped bracket 6 corresponding to the two pulley structures. The pulley structure includes two pulleys 8 distributed up and down and connecting plates 10 symmetrically arranged on both sides of the pulley 8. Two pulley shafts are arranged between the two connecting plates, and the tops of the two connecting plates 10 are connected to each other. The pulley 8 is rotatably connected to the pulley shaft, so as to rotate relative to the connecting plate 10. A screw is arranged on the top of the pulley structure. The pulley structure is arranged at the bottom of the H-shaped bracket 6 through the cooperation of the screw and the screw hole, and the height relative to the H-shaped bracket 6 is adjusted by adjusting the length of the screw screwed into the screw hole. A mounting plate 9 simulating the lateral wind load is installed on the outside of the connecting plate 10.

[0029] After the conductor 11 is connected to the sliding wire clamp 5, both ends of the conductor pass through the pulley structures on the H-shaped hangers 6 on both sides respectively, and the conductor 11 is respectively wound around the bottom and top of the two pulleys 8 in the two pulley structures. Specifically, since the pulley 8 is set at a height lower than the insulating string 1, the conductor 11 is wound around the bottom of the pulley 8 close to the insulating string 1 and around the top of the other pulley 8, so that the conductor 11 is suspended on both sides of the insulating string 1. By adjusting the height of the pulley 8, the suspension angle and horizontal tension of different sag conductors 11 can be simulated to simulate the mechanical properties of different conductors 11; at the same time, by adjusting the relative height of the two pulley structures, the conductor 11 between the two pulley structures is in a horizontal state, and a counterweight 7 is hung at one end of the conductor 11 away from the insulating string 1, which sags vertically to simulate the vertical load and horizontal tension of the conductor 11. Adjusting the counterweights 7 of different weights on both sides can achieve the purpose of simulating different conductor 11 spans, split numbers and vertical loads, and at the same time can ensure the in-plane stability of the H-shaped hanger 6 under lateral wind loads.

[0030] The top of the H-shaped hanger 6 is connected to the hanging point through two hinge points and can swing relative to the hanging point. The swing axis is located in the same plane as the center axis of the initial position of the insulating string 1 and the initial setting direction of the conductor 11.

[0031] By applying an equivalent lateral wind load to the conductor 11 via the lateral loading mounting plate 9, the H-shaped mounting bracket 6 is offset and swung along with the pulley 8, so that the center of gravity of the conductor 11 on both sides of the insulating string 1 changes during the offset and swinging process of the conductor 11, and the influence of the out-of-plane stiffness of the conductor 11 on the wind deflection angle of the insulating string 1 can be accurately simulated. An inclinometer 4 is installed on the V-shaped / L-shaped insulating string 1, and a rechargeable inclinometer 4 is used to test the angle between the two strings, and the wind deflection angle under different wind loads is recorded. Different or the same lateral load forces can be applied to the two mounting plates 9 on both sides of the insulating string 1.

[0032] In this embodiment, two parallel conductors 11 are provided. The two conductors 11 are arranged up and down on the sliding wire clamp 5 and are respectively connected to the upper and lower pulleys 8 of the pulley structure. The two ends of the two conductors 11 can be mounted with counterweights 7 of G1, G2, G3 and G4 respectively. The two upper and lower pulleys 8 distributed in the pulley structure can control the center of gravity of the conductor to always be vertical, and it is convenient to apply lateral wind loads; maintaining the vertical center of gravity facilitates the control of the suspension and force of the conductor.

[0033] The simulation test method corresponding to the simulation test device of this embodiment is:

[0034] Adjust the hanging point distance of insulating string 1 and the length of double strings to simulate different voltage levels and different internal and external angle configurations.

[0035] The height of the pulley 8 relative to the H-shaped hanger 6 is adjusted to simulate the hanging angle and horizontal tension of different hanging wires, and to simulate the mechanical properties of different wires at different hanger heights.

[0036] A lateral wind load is applied at the center of the mounting plate 9 to ensure that the upper and lower conductors 11 are subjected to equal lateral wind loads, thereby simulating different lateral wind loads on the conductors.

[0037] Adjust the vertical load counterweight 7 of the simulated conductors on both sides to simulate the vertical load of different conductor spans.

[0038] The inclinometer 4 is used to record the wind deflection angle of the insulation string under the above different conditions.

[0039] The technical solutions of the present invention are not limited to the above-mentioned embodiments, and any technical solutions obtained by equivalent replacement methods fall within the scope of protection required by the present invention.

Claims

1. A wind deflection angle simulation test device for an insulation string of a high-voltage transmission line conductor, wherein a sliding wire clamp is installed at the bottom of the insulation string, and the conductor is connected to the sliding wire clamp; characterized in that: The simulation test device comprises an inclinometer, an H-shaped hanger, a pulley structure and a mounting plate; the inclinometer is arranged on the insulating string, the H-shaped hanger is hinged on the hanging point, two pulley structures are arranged at the bottom of the H-shaped hanger, and the height can be adjusted up and down relative to the H-shaped hanger, and the mounting plate is arranged on the side of the pulley structure; The conductor passes over the pulleys of the two pulley structures, and a counterweight is hung at the end away from the insulating string to simulate the vertical load of the conductor; the mounting plate is used to apply a lateral tension to the pulley structure to simulate the lateral wind load on the conductor.

2. According to claim 1, the high-voltage transmission line conductor insulation string wind deflection angle simulation test device is characterized in that: The pulley structure includes a plurality of pulleys distributed up and down and connecting plates symmetrically arranged on both sides of the pulleys. The tops of the two connecting plates are connected to each other, and a telescopic rod is fixed at the connection. The pulley structure is connected to the H-shaped bracket through the telescopic rod, and the height is adjusted up and down relative to the H-shaped bracket, thereby adjusting the hanging angle of the wire.

3. According to claim 2, the high-voltage transmission line conductor insulation string wind deflection angle simulation test device is characterized in that: The telescopic rod at the top of the pulley structure is a screw rod, and screw holes are provided at the bottom of the H-shaped bracket and at the corresponding positions of the two pulley structures. The pulley structure is arranged at the bottom of the H-shaped bracket through the cooperation of the screw rod and the screw hole, and the height relative to the H-shaped bracket is adjusted by the length of the screw rod screwed into the screw hole.

4. The high-voltage transmission line conductor insulation string wind deflection angle simulation test device according to claim 3 is characterized in that: The conductors are respectively wound around the bottom and top of two pulleys in the two pulley structures.

5. The high-voltage transmission line conductor insulation string wind deflection angle simulation test device according to claim 4 is characterized in that: The conductor between the two pulley structures is arranged horizontally.

6. The high-voltage transmission line conductor insulation string wind deflection angle simulation test device according to claim 5 is characterized in that: The top of the H-shaped hanger is connected to the hanging point through two hinge points and can swing relative to the hanging point, and the swing axis is located in the same plane as the central axis of the initial position of the insulation string and the initial setting direction of the conductor.

7. The high-voltage transmission line conductor insulation string wind deflection angle simulation test device according to claim 1 is characterized in that: H-shaped hangers are respectively arranged on both sides of the insulating string, and the H-shaped hangers on both sides are connected to the pulley structure.

8. The high-voltage transmission line conductor insulation string wind deflection angle simulation test device according to claim 1 is characterized in that: An inclinometer is respectively arranged at both ends of each insulator string of the insulation string.

9. The high-voltage transmission line conductor insulation string wind deflection angle simulation test device according to any one of claims 1 to 8, characterized in that: The insulating string is a V-shaped insulating string or an L-shaped insulating string.

10. The high-voltage transmission line conductor insulation string wind deflection angle simulation test device according to claim 9, characterized in that: The V-shaped insulation string or L-shaped insulation string includes two insulator strings, two ends of the two insulator strings are respectively connected to two hanging points and an L-shaped connecting plate through connecting hardware, and the sliding wire clamp is connected to the L-shaped connecting plate.

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