Emergency galloping stopping device and method for icing galloping of power transmission line

Abstract

The invention discloses an emergency galloping stopping device and method for icing galloping of a power transmission line, and relates to the technical field of power transmission and transformation project structure vibration reduction. The damper is arranged on the ground, the damper is connected with the end, away from the power transmission line, of the traction cable through a connecting piece, and in the galloping process of the power transmission line, the damper is driven to move through the traction cable to dissipate energy; one end of the elastic device is connected with the connecting piece, the other end of the elastic device is connected to the ground, and the elastic device is used for providing restoring force for the damper and applying pretension force to the traction cable. According to the galloping stopping method based on the emergency galloping stopping device for icing galloping of the power transmission line, the power transmission line is connected with the damper through the traction cable, energy is consumed through the damper in an eddy current mode, the galloping stopping effect is achieved on the power transmission line in the icing galloping process in combination with the wire drawing technology and the damping vibration attenuation technology, and the galloping stopping effect is good. Emergency galloping stopping of a power transmission line galloping site is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction of power transmission and transformation engineering structures, and in particular to an emergency anti-vibration device and method for ice-covered power transmission lines. Background Art

[0002] Transmission line ice dancing refers to the phenomenon that under certain meteorological conditions, the conductors or ground wires of the transmission lines produce large-amplitude, low-frequency vibrations due to the action of wind after ice (freezing rain or frost deposited on the conductors) is covered. This dancing will not only cause strong swings of the conductors, but may also lead to serious consequences such as conductor breakage, insulator damage, tower collapse, etc., seriously affecting the safe operation of the power system.

[0003] With the frequent occurrence of extreme weather and significant changes in the coverage area, new characteristics of winter transmission line galloping disasters have emerged. Traditional galloping areas have repeatedly experienced galloping phenomena that exceed the defense capacity, while non-traditional galloping areas have repeatedly experienced large-scale galloping phenomena. The impact of galloping disasters on the safe operation and reliable power supply of the power grid has gradually increased. Galloping disasters are sudden, long-term and extremely strong, causing large-scale power outages. The risk of causing adverse social impacts always exists. It is urgent to carry out relevant emergency technology research and development to improve the ability of power grid facilities to respond to galloping disasters.

[0004] In terms of "anti-dancing" and "anti-dancing", China has formed an anti-dancing system based on dancing distribution maps and dancing grade classification, but the existing anti-dancing research is mostly pre-emptive preventive measures and cannot be used for emergency disposal at the scene of dancing disasters. The existing anti-dancing measures for transmission lines are mainly designed according to standards, which cannot resist dancing disasters that exceed the defense standards, and cannot avoid the risks of non-traditional dancing areas and over-designed dancing disasters; in terms of research on emergency disposal of dancing, domestic and foreign countries have carried out emergency disposal methods for line ice-covered dancing based on ice melting, deicing and other technologies, but its principle is to destroy the dancing conditions of the line by deicing. Due to the high equipment cost, low equipment rate, and limited use conditions, it cannot be widely popularized and it is difficult to meet the needs of stopping dancing in the state of transmission line dancing. Therefore, it is urgent to study and design an emergency dance-stopping scheme for transmission line dancing. Summary of the invention

[0005] The purpose of the present invention is to provide an emergency dancing-stopping device and method for power transmission lines dancing due to ice coating, so as to solve the problems existing in the above-mentioned prior art. A pulling cable is used to connect the transmission line to a damper, and energy is consumed in the form of eddy currents through the damper. The wire pulling technology and the damping and vibration reduction technology are combined to achieve the effect of stopping the dancing of the transmission line during the dancing due to ice coating, thereby realizing emergency stopping of the dancing of the transmission line on site.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides an emergency device for stopping ice-covered dancing of a power transmission line, comprising:

[0008] A guy wire, which is installed on the transmission line;

[0009] The damper is arranged on the ground, and the damper is connected to the end of the pulling rope away from the power transmission line through a connecting piece. When the power transmission line is dancing, the damper is driven by the pulling rope to dissipate energy;

[0010] The elastic device has one end connected to the connecting member and the other end connected to the ground, and is used to provide a restoring force to the damper and apply a pre-tension to the pulling cable.

[0011] Optionally, the guy rope is arranged at a set position of the transmission line, and the set position is a non-modal stagnation point position of the transmission line vibration mode obtained by calculation; during installation, through calculation, attention is paid to the non-modal stagnation point position of the transmission line vibration mode, and several guy ropes are connected at the transmission line position that can cover multiple vibration modes.

[0012] Optionally, the transmission line is provided with a spacer bar, and the tension cable is arranged at a set position of the spacer bar, and the set position is a non-vibration mode stagnation point position of the transmission line vibration mode obtained by calculation.

[0013] Optionally, the connecting member is a connecting rod, one end of which is connected to the damper, and the other end of which is connected to the pulling cable, and the elastic member is connected to the connecting rod at a position between the damper and the pulling cable.

[0014] Optionally, the elastic member is a spring, one end of the spring is connected to the connecting rod, and the other end of the spring is connected to the ground.

[0015] Optionally, the elastic member is a spring, and a plurality of the springs are arranged in parallel, and one end of the plurality of springs is respectively connected to the connecting rod, and the other end is connected to the ground. The transmission line is connected to a damper fixed on the ground through a pull cable, and a spring is added to the damper end to provide a restoring force for the damper and a pre-tension for the pull cable, so as to ensure that the transmission line moves up and down together with the pull cable when dancing occurs, driving the damper to consume energy, thereby achieving the effect of suppressing the dancing of ice-covered transmission lines.

[0016] Optionally, it also includes a fixed base plate, and the damper is arranged on the ground through the fixed base plate; the other end of the elastic device is connected to the ground through the fixed base plate.

[0017] Optionally, the damper includes a speed gear set and an eddy current damping component, and the speed gear set is designed to have multiple adjustable transmission ratios according to actual working conditions; the outer shell of the speed gear set is fixedly mounted on the support base through a reinforcing connecting plate, and the bottom of the support base is connected to the fixed base plate; the input end of the speed gear set is connected to a rotating shaft, which is connected to the connecting piece, and the output end of the speed gear set is connected to the eddy current damping component.

[0018] Optionally, the eddy current damping component includes a magnetic steel shaft, which is transmission-connected to the output end of the speed gear set, and a permanent magnet is fixedly provided on the outside of the magnetic steel shaft; a back iron of a cylindrical structure is fixedly connected to one end of the outer shell of the speed gear set, and a conductor tube is fixedly provided on the inside of the back iron, the permanent magnet is located in the conductor tube, and the permanent magnet and the conductor tube are separated by an air gap, which is a non-contact structure.

[0019] The present invention also provides an emergency method for stopping ice-covered power transmission line dancing, comprising the following steps:

[0020] Step 1: Selecting positions on the transmission line that can cover multiple vibration modes through calculation, connecting a plurality of tension cables to spacer bars on the transmission line, or connecting a plurality of tension cables to the transmission line;

[0021] Step 2: Fix a number of dampers equal in number to the pulling cables on the ground, each damper is connected to a rotating shaft, the pulling cables are connected to the corresponding rotating shafts through connecting rods, and the dampers are provided with restoring force through springs to apply pre-tension to the pulling cables;

[0022] In step three, the pulling cable drives the rotating shaft to rotate through the connecting rod, and the speed change gear set adjusts the rotation speed of the rotating shaft. The permanent magnet and the magnetic steel shaft in the eddy current damping component are driven to rotate through the output end. The conductor tube cuts the magnetic lines to generate damping force and consumes energy in the form of eddy currents.

[0023] Compared with the prior art, the present invention has achieved the following technical effects:

[0024] The present invention realizes emergency treatment during the ice-covered dancing process of the transmission line, supplements and improves the existing transmission line ice-covered dancing prevention and control technology and method, and realizes disaster prevention and control during the ice-covered dancing process of the line. The present invention combines the wire pulling technology of the pull cable with the damping and vibration reduction technology of the damper to achieve the effect of stopping the dancing of the transmission line during the ice-covered dancing process. A spring is added to the damper end to provide restoring force for the damper and pre-tension for the pull cable, while preventing damage to the transmission line caused by excessive tension of the pull cable. The present invention can be applied to both types of conductors with and without spacers, with a wide range of applications and easy operation. At the same time, emergency pulling on the spacer can prevent the pull cable from wearing the conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the principle of the emergency dancing stopping device for ice-covered power transmission line of the present invention;

[0027] Figure 2 It is a schematic structural diagram of an emergency anti-dancing device for icing-covered power transmission lines according to the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the damper of the present invention.

[0029] In the figure: 1-transmission line, 2-spacer rod, 3-pull rope, 4-damper, 401-speed gear set, 402-permanent magnet, 403-magnetic steel shaft, 404-conductor tube, 405-back iron, 5-spring, 6-rotating shaft, 7-connecting rod, 8-reinforced connecting plate, 9-support base, 10-fixed bottom plate. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The purpose of the present invention is to provide an emergency dancing-stopping device and method for power transmission lines dancing due to ice coating, so as to solve the problems existing in the above-mentioned prior art. A pulling cable is used to connect the transmission line to a damper, and energy is consumed in the form of eddy currents through the damper. The wire pulling technology and the damping and vibration reduction technology are combined to achieve the effect of stopping the dancing of the transmission line during the dancing due to ice coating, thereby realizing emergency stopping of the dancing of the transmission line on site.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] The present invention provides an emergency device for stopping ice-covered power transmission line dancing, such as Figure 1 , Figure 2 , Figure 3As shown, it includes a pull rope 3 arranged on the transmission line 1; a damper 4 is arranged on the ground, and the damper 4 is connected to the end of the pull rope 3 away from the transmission line 1 through a connecting piece. During the dancing of the transmission line 1, the pull rope 3 drives the damper 4 to move and consume energy; one end of the elastic device is connected to the connecting piece, and the other end is connected to the ground. The connecting piece can be a horizontally arranged connecting rod 7. The elastic device connected to the connecting rod 7 is used to provide a restoring force to the damper 4 and apply a pre-tension to the pull rope 3. The pull rope 3 and the transmission line 1 vibrate up and down synchronously, driving the connecting piece to swing, and then driving the rotating shaft 6 to rotate synchronously, relying on the damper 4 to consume energy, thereby realizing the emergency stopping of the ice-covered dancing of the transmission line 1.

[0034] The elastic member in this embodiment is a spring 5, and the number of springs 5 ​​is not limited. In order to meet the pre-tension requirements of the pull rope 3 for emergency anti-dancing of the transmission line 1 of different voltage levels, the elastic member located near the end of the damper 4 can be composed of multiple springs 5 ​​in parallel. One end of the multiple springs 5 ​​is respectively connected to the connecting rod 7, and the other end is connected to the ground. The transmission line 1 is connected to the damper 4 fixed on the ground through the pull rope 3, and a spring 5 is added at the end of the damper 4 to provide a restoring force for the damper 4 and a pre-tension for the pull rope 3, so as to ensure that the transmission line 1 moves up and down together with the pull rope 3 when dancing occurs, driving the damper 4 to consume energy, thereby achieving the effect of suppressing the dancing of the ice-covered transmission line 1.

[0035] Optionally, the tension rope 3 is arranged at a set position of the transmission line 1, and the set position is the non-modal stagnation point position of the vibration mode of the transmission line 1 obtained by calculation; during installation, the non-modal stagnation point position of the vibration mode of the transmission line 1 is paid attention to by calculation, and a plurality of tension ropes 3 are connected to the position of the transmission line 1 that can cover a variety of vibration modes. In another preferred embodiment, a spacer bar 2 is provided on the transmission line 1. In electrical engineering and cable laying, the spacer bar 2 is used to maintain a fixed interval between cables to prevent the cables from contacting each other or surrounding objects, and plays a role of insulation and protection. The tension rope 3 is arranged at the set position of the spacer bar 2 to avoid the tension rope 3 being directly connected to the transmission line 1. When vibrating, it can ensure that the tension rope 3 will not damage the transmission line 1 due to friction or the like.

[0036] The damper 4 of this embodiment performs energy dissipation and vibration reduction based on the eddy current principle. Eddy current is an electromagnetic phenomenon. When a conductive material is placed in a changing magnetic field, a circular current is generated inside the material. These currents are called eddy currents. The generation of eddy currents follows Faraday's law of electromagnetic induction, that is, a changing magnetic field generates an electromotive force, thereby inducing current in the conductor. The size, direction and distribution of eddy currents depend on the rate of change of the magnetic field, the electrical conductivity and magnetic permeability of the conductor, and the geometric shape of the conductor; in practical applications, the damping force generated by eddy currents can be used to achieve braking and vibration reduction energy dissipation.

[0037] The damper 4 in this embodiment adopts a speed gear set 401 and is connected to the eddy current damping component. The input end of the speed gear set 401 is connected to the rotating shaft 6, the rotating shaft 6 is connected to the connecting member, and the output end of the speed gear set 401 is connected to the eddy current damping component. The eddy current damping component includes a magnetic steel shaft 403, which is transmission-connected to the output end of the speed gear set 401, and a permanent magnet 402 is fixedly provided on the outer side of the magnetic steel shaft 403, and the permanent magnet 402 and the magnetic steel shaft 403 constitute the mover of the eddy current damping component; a back iron 405 of a cylindrical structure is fixedly connected to one end of the outer shell of the speed gear set 401, and the back iron 405 refers to a metal plate or strip used to reinforce the structure or as a support, and a conductor tube 404 is fixedly provided on the inner side of the back iron 405, and the conductor tube 404 and the back iron 405 constitute a stator, and the permanent magnet 402 is located in the conductor tube 404, and the permanent magnet 402 and the conductor tube 404 are separated by an air gap, which is a non-contact structure.

[0038] The speed gear set 401 of this embodiment is designed to be in a form with multiple adjustable transmission ratios according to the actual working conditions; the housing of the speed gear set 401 is fixedly mounted on the support base 9 through the reinforcing connecting plate 8, and the bottom of the support base 9 is connected to the fixed base plate 10; the speed gear set 401 is a mechanical device used to change the output speed and torque in the power transmission system. The speed gear set 401 realizes the conversion of speed and torque through different gear combinations, so that the drive device can operate within the optimal efficiency range and adapt to different working conditions or load requirements. The core of the speed gear set 401 is a gear pair, which usually includes multiple gears that mesh at different ratios to change the speed and torque of the output shaft. The size, number of teeth and arrangement of the gears determine the speed ratio, that is, the ratio of the speed of the input shaft to the speed of the output shaft. By switching different gear combinations, that is, shifting, different output speeds and torques can be achieved to adapt to different driving or working conditions, which belongs to the existing structure.

[0039] During the operation of the present invention, when the pulling rope 3 vibrates, the connecting rod 7 swings up and down, driving the rotating shaft 6 to rotate back and forth, and the rotating shaft 6 drives the input shaft of the speed change gear set 401 to rotate back and forth. The speed change gear set 401 adjusts the rotation speed, and then drives the permanent magnet 402 and the magnetic steel shaft 403 in the eddy current damping component to rotate through the output end, and the conductor tube 404 cuts the magnetic lines of force to generate a damping force, which consumes energy in the form of eddy currents.

[0040] Based on the above structure, the present invention also provides an emergency method for stopping ice-covered dancing of a power transmission line 1, comprising the following steps:

[0041] Step 1: Selecting positions on the transmission line 1 that can cover multiple vibration modes thereof through calculation, connecting a plurality of tension cables 3 to the spacer bars 2 on the transmission line 1, or connecting a plurality of tension cables 3 to the transmission line 1;

[0042] Step 2: fix a number of dampers 4 equal in number to the pulling cables 3 on the ground, each damper 4 is connected to a rotating shaft 6, the pulling cables 3 are connected to the corresponding rotating shaft 6 via connecting rods 7, and the dampers 4 are provided with restoring force via springs 5 ​​to apply pre-tension to the pulling cables 3, so as to ensure that the transmission line 1 moves up and down together with the pulling cables 3 during the dancing process;

[0043] In step three, the pulling rope 3 drives the rotating shaft 6 to rotate through the connecting rod 7, and the speed change gear set 401 adjusts the rotation speed of the rotating shaft 6. The permanent magnet 402 and the magnetic steel shaft 403 in the eddy current damping component are driven to rotate through the output end. The conductor tube 404 cuts the magnetic lines of force to generate damping force and consume energy in the form of eddy currents.

[0044] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An emergency device for stopping ice-covered dancing of power transmission lines, characterized in that: include: A guy wire, which is installed on the transmission line; The damper is arranged on the ground, and the damper is connected to the end of the pulling rope away from the power transmission line through a connecting piece. When the power transmission line is dancing, the damper is driven by the pulling rope to dissipate energy; The elastic device has one end connected to the connecting member and the other end connected to the ground, and is used to provide a restoring force to the damper and apply a pre-tension to the pulling cable.

2. The emergency anti-dancing device for ice-covered power transmission line according to claim 1 is characterized in that: The pull rope is arranged at a set position of the transmission line, and the set position is a non-vibration mode stagnation point position of the transmission line vibration mode obtained by calculation.

3. The emergency anti-dancing device for power transmission line ice-covered dancing according to claim 1 is characterized in that: The transmission line is provided with a spacer bar, and the pull rope is arranged at a set position of the spacer bar, and the set position is a non-vibration mode stagnation point position of the transmission line vibration mode obtained by calculation.

4. The emergency anti-dancing device for ice-covered power transmission line according to claim 1 is characterized in that: The connecting member is a connecting rod, one end of which is connected to the damper, and the other end of which is connected to the pulling cable, and the elastic member is connected to the connecting rod at a position between the damper and the pulling cable.

5. The emergency anti-dancing device for power transmission line ice-covered dancing according to claim 4 is characterized in that: The elastic member is a spring, one end of which is connected to the connecting rod, and the other end of which is connected to the ground.

6. The emergency anti-dancing device for ice-covered power transmission line according to claim 4 is characterized in that: The elastic member is a spring, a plurality of the springs are arranged in parallel, and one end of the plurality of springs is respectively connected to the connecting rod, and the other end is connected to the ground.

7. The emergency anti-dancing device for power transmission line ice-covered dancing according to claim 1 is characterized in that: It also includes a fixed bottom plate, and the damper is arranged on the ground through the fixed bottom plate; the other end of the elastic device is connected to the ground through the fixed bottom plate.

8. The emergency anti-dancing device for power transmission line ice-covered dancing according to claim 7, characterized in that: The damper includes a speed gear set and an eddy current damping component; the outer shell of the speed gear set is fixedly mounted on a support base through a reinforcing connecting plate, and the bottom of the support base is connected to the fixed base plate; the input end of the speed gear set is connected to a rotating shaft, the rotating shaft is connected to the connecting piece, and the output end of the speed gear set is connected to the eddy current damping component.

9. The emergency anti-dancing device for ice-covered power transmission line according to claim 8, characterized in that: The eddy current damping component includes a magnetic steel shaft, which is transmission-connected to the output end of the speed change gear set, and a permanent magnet is fixedly provided on the outer side of the magnetic steel shaft; a back iron of a cylindrical structure is fixedly connected to one end of the outer shell of the speed change gear set, and a conductor tube is fixedly provided on the inner side of the back iron, the permanent magnet is located in the conductor tube, and the permanent magnet and the conductor tube are separated by an air gap.

10. An emergency method for stopping ice-covered power transmission line dancing, characterized in that: The steps include: Step 1: Selecting positions on the transmission line that can cover multiple vibration modes through calculation, connecting a plurality of tension cables to spacer bars on the transmission line, or connecting a plurality of tension cables to the transmission line; Step 2: Fix a number of dampers equal in number to the pulling cables on the ground, each damper is connected to a rotating shaft, the pulling cables are connected to the corresponding rotating shafts through connecting rods, and the dampers are provided with restoring force through springs to apply pre-tension to the pulling cables; In step three, the pulling cable drives the rotating shaft to rotate through the connecting rod, and the speed change gear set adjusts the rotation speed of the rotating shaft. The permanent magnet and the magnetic steel shaft in the eddy current damping component are driven to rotate through the output end. The conductor tube cuts the magnetic lines to generate damping force and consumes energy in the form of eddy currents.

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