Power transmission line vibration suppression device and method based on inertial mass and electromagnetic damping

Abstract

The invention provides a power transmission line vibration suppression device and method based on inertial mass and electromagnetic damping. The power transmission line vibration suppression device comprises a spacer, a connecting frame, an electromagnetic damper, a balancing weight and a transmission mechanism. The electromagnetic damper comprises a permanent magnet assembly and a conductor disc for cutting magnetic induction lines, and the transmission mechanism is connected with the balancing weight and the conductor disc and used for converting reciprocating linear motion generated by the balancing weight under the vibration effect into circular motion in different rotation directions and driving the conductor disc to rotate to cut the magnetic induction lines. According to the device and the method, the balancing weight is adopted to provide directional torque for restraining torsion of the power transmission line, the balancing weight does reciprocating rectilinear motion and drives the electromagnetic damper, so that the damping effect is remarkably improved, vertical vibration energy is consumed, vibration can be rapidly stopped, vertical vibration and torsional vibration of the multi-split power transmission line are restrained at the same time, and the reliability of the device is improved. Damage to the sub-conductors, the sub-conductor spacers and the phase-to-phase spacers is avoided, and safety and stability of power supply are guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of transmission line vibration suppression, and specifically relates to a transmission line vibration suppression device and method based on inertia and electromagnetic damping. Background Art

[0002] Overhead transmission lines erected in cold areas or operating in winter will produce ice under suitable meteorological conditions, which will cause de-icing and jumping or dancing. De-icing jumping is a phenomenon in which the ice on the conductor or ground wire loosens when the temperature rises. Under the combined action of wind and ice gravity, the ice falls off, causing the ice load on the conductor to suddenly unload, resulting in large-scale jumping vibrations of the conductor. The large-scale vibration during de-icing jumping will cause impact loads on insulator strings, hardware, towers, etc. In severe cases, it may cause insulator breakage, hardware damage, or deformation of the crossarms of transmission towers, and even collapse of towers. Galloping is a large-amplitude, low-frequency self-excited oscillation caused by wind loads after irregular ice coating on transmission conductors or ground wires, which can cause structural damage to transmission lines and electrical failures. For multi-split conductors, ice shedding, jumping or dancing will not only cause vertical vibration of the conductor bundle, but also cause large torsional vibration of the conductor bundle. Large vertical vibration will lead to insufficient electrical safety distance between conductors, between conductors and ground wires, and between conductors and the ground, causing phase-to-phase flashover, tripping and other accidents. Torsional vibration will cause the sub-conductors to twist and collide, damaging the conductors.

[0003] At present, relevant literature has proposed a solution to suppress the jumping and dancing of conductors due to deicing by installing interphase spacers. However, conventional interphase spacers suppress deicing jumping and dancing mainly through mutual rigid restraint between different phase conductors, which mainly leaves the following problems:

[0004] 1) Lack of energy dissipation, making it difficult to calm the vibration quickly;

[0005] 2) When a large amount of ice shedding occurs suddenly, the conductor will vibrate violently instantly, which will have a strong impact on the spacer rod body and the hardware at the connection between the spacer rod and the conductor, causing the spacer rod or the hardware to break.

[0006] Relevant scholars have also proposed other types of wire deicing jumping or dancing suppression devices, but the main problems are:

[0007] 1) Damping performance mainly depends on component friction or viscous liquid, and there is a risk of wear and leakage during long-term use;

[0008] 2) It is difficult to simultaneously suppress the vertical and torsional vibrations of multiple split conductors.

[0009] Therefore, there is an urgent need to develop devices and methods that can produce significant damping effects and simultaneously suppress the vertical and torsional vibrations of multiple split conductors, so as to avoid damage to the line structure caused by large vibrations caused by de-icing or dancing. Summary of the invention

[0010] In order to overcome the above-mentioned deficiencies of the prior art, the present invention application proposes a transmission line vibration suppression device based on inertia and electromagnetic damping, comprising: a spacer bar 12, a connecting frame, an electromagnetic damper, a counterweight block 9 and a transmission mechanism;

[0011] The spacer bar 12 is clamped on the transmission line, and the connecting frame connects the electromagnetic damper and the spacer bar 12;

[0012] The electromagnetic damper comprises a permanent magnet assembly and a conductor disc 2 for cutting magnetic flux lines, wherein the permanent magnet assembly is arranged on the connecting frame, and the conductor disc 2 is located in the middle cavity of the spacer rod 12;

[0013] The counterweight block 9 is arranged below the conductor disc 2;

[0014] The transmission mechanism connects the counterweight block 9 and the conductor disc 2, and is used to convert the reciprocating linear motion generated by the counterweight block 9 under the action of vibration into circular motion in different rotation directions, thereby driving the conductor disc 2 to rotate and cut the magnetic flux lines.

[0015] Preferably, the transmission mechanism includes a rotating shaft 4, a lead screw 6 and a lead screw nut 7, the upper end of the rotating shaft 4 is fixed to the center of the conductor disk 2, the lower end of the rotating shaft 4 is coaxially fixedly connected to the lead screw 6, the lead screw nut 7 is threadedly connected to the lead screw 6, the counterweight block 9 is located below the lead screw nut 7 and is rigidly connected to it with a gap, and the counterweight block 9 drives the lead screw nut 7 to reciprocate linearly along the lead screw 6, thereby driving the lead screw 6 to rotate.

[0016] Preferably, a shell 10 is provided outside the counterweight block 9, a section of the lead screw 6 and the lead screw nut 7 are both located inside the shell 10, the section of the lead screw 6 located inside the shell 10 is rotatably connected to the shell 10, a spring 8 is provided between the bottom surface of the counterweight block 9 and the inner wall of the shell 10, and a spring 8 is also provided between the top surface of the lead screw nut 7 and the inner wall of the shell 10.

[0017] Preferably, the counterweight block 9 and the lead screw nut 7 are rigidly connected via a plurality of steel columns 13 .

[0018] Preferably, the spring 8 and the counterweight 9 are both sleeved on the lead screw 6 and slidably cooperate with the lead screw 6 .

[0019] Preferably, a vertical limit bar 14 is provided on the inner side wall of the housing 10 , and the vertical limit bar 14 abuts against the side wall of the screw nut 7 to limit the rotation of the screw nut 7 .

[0020] Preferably, the permanent magnet assembly includes multiple permanent magnets 1, and the multiple permanent magnets 1 are arranged in pairs, and the multiple pairs of permanent magnets 1 are arranged in a ring around the center of the conductor disk 2. The two permanent magnets 1 of each pair are arranged on the upper and lower sides of the conductor disk 2 and are arranged at equal intervals from the conductor disk 2. The permanent magnets 1 are set on the connecting frame.

[0021] Preferably, the connecting frame includes a connecting plate 11 and a cover plate 3, the connecting plate 11 is fixed on the spacer rod 12, there are two cover plates 3, which are arranged on the connecting plate 11 up and down, the conductor disk 2 is located between the two cover plates 3, and the permanent magnet assembly is arranged on the cover plate 3.

[0022] Preferably, the conductor disk 2 is arranged at the center of the middle cavity of the spacer bar 12 .

[0023] Based on the same inventive concept, the present invention also provides a method for suppressing vibration of a power transmission line based on inertia and electromagnetic damping, the method comprising:

[0024] When the transmission line vibrates vertically up and down, the counterweight 9 makes a reciprocating linear motion close to or away from the center of the spacer bar 12 due to the action of gravity and inertia, and drives the conductor disc 2 in the electromagnetic damper to rotate through the transmission mechanism to cut the magnetic flux lines generated by the permanent magnet assembly on the connecting frame, generating eddy currents and electromagnetic torques opposite to the rotation direction in the conductor disc 2, converting kinetic energy into heat energy generated by eddy current heating, thereby realizing electromagnetic damping. At the same time, the rotation of the conductor disc 2 generates an inertial mass effect, rapidly amplifying the physical mass of the conductor disc 2 and improving the inertial damping effect.

[0025] When the power transmission line is twisted, the counterweight block 9 itself provides a directional torque to suppress the twisting of the power transmission line due to the effects of gravity and inertia, thereby suppressing the twisting of the power transmission line.

[0026] Compared with the closest prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention application provides a transmission line vibration suppression device based on inertia and electromagnetic damping, including using a transmission mechanism to connect a counterweight 9 and an electromagnetic damper, and utilizing the reciprocating linear motion of the counterweight 9 generated by the vibration of the transmission line to drive the electromagnetic damper to work through the transmission mechanism; the counterweight 9 itself provides a directional torque to suppress the torsion of the transmission line, and the reciprocating linear motion of the counterweight 9 and driving the electromagnetic damper significantly improves the damping effect, consumes vertical vibration energy, and can quickly stop the vibration, thereby achieving simultaneous suppression of vertical and torsional vibrations of multi-split transmission lines, avoiding damage to sub-conductors, sub-conductor spacers, and phase spacers, and ensuring safe and stable power supply.

[0028] 2. The present invention adopts an electromagnetic damper to improve the damping effect so that the friction and wear of the whole device are small, there is no risk of leakage during long-term use, the service life is long, and it can be suitable for long-term operation in harsh outdoor environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a transmission line vibration suppression device based on inertia and electromagnetic damping provided in the present invention application. DETAILED DESCRIPTION

[0030] The specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings.

[0031] Embodiment 1:

[0032] The structural schematic diagram of a transmission line vibration suppression device based on inertia and electromagnetic damping provided by the present invention is as follows: Figure 1 As shown, it includes: a spacer rod 12, a connecting frame, an electromagnetic damper, a counterweight block 9 and a transmission mechanism;

[0033] The spacer bar 12 is clamped on the transmission line, and the connecting frame connects the electromagnetic damper and the spacer bar 12;

[0034] The electromagnetic damper comprises a permanent magnet assembly and a conductor disc 2 for cutting magnetic flux lines, wherein the permanent magnet assembly is arranged on the connecting frame, and the conductor disc 2 is located in the middle cavity of the spacer rod 12;

[0035] The counterweight block 9 is arranged below the conductor disc 2;

[0036] The transmission mechanism connects the counterweight block 9 and the conductor disc 2, and is used to convert the reciprocating linear motion generated by the counterweight block 9 under the action of vibration into circular motion in different rotation directions, thereby driving the conductor disc 2 to rotate and cut the magnetic flux lines.

[0037] The spacer bar 12 is a standard hardware on the transmission line, and the connecting plate 11 is welded or threadedly connected to the spacer bar 12 .

[0038] For wires with two-split, four-split, eight-split or other split numbers, the spacer 12 should match the split number of the corresponding wire.

[0039] The electromagnetic damper and the counterweight 9 are connected by a transmission mechanism, which can simultaneously suppress large vertical and torsional vibrations of the conductor caused by de-icing or dancing. The damping is mainly generated by electromagnetic force. The whole device has less friction and wear and a long service life, and can be suitable for long-term operation in harsh outdoor environments.

[0040] The transmission mechanism includes a rotating shaft 4, a lead screw 6 and a lead screw nut 7. The upper end of the rotating shaft 4 is fixed to the center of the conductor disk 2, and the lower end of the rotating shaft 4 is coaxially fixedly connected to the lead screw 6. The lead screw nut 7 is threadedly connected to the lead screw 6. The counterweight block 9 is located below the lead screw nut 7 and is rigidly connected to it with a gap. The counterweight block 9 drives the lead screw nut 7 to reciprocate linearly along the lead screw 6, thereby driving the lead screw 6 to rotate.

[0041] The lower end of the rotating shaft 4 is coaxially fixedly connected to the lead screw 6 via a coupling 5 .

[0042] A shell 10 is arranged outside the counterweight block 9, a section of the lead screw 6 and the lead screw nut 7 are both located inside the shell 10, a section of the lead screw 6 located inside the shell 10 is rotatably connected to the shell 10, a spring 8 is arranged between the bottom surface of the counterweight block 9 and the inner wall of the shell 10, and a spring 8 is also arranged between the top surface of the lead screw nut 7 and the inner wall of the shell 10.

[0043] The counterweight block 9 and the lead screw nut 7 are rigidly connected via a plurality of steel columns 13 .

[0044] The spring 8 and the counterweight 9 are both sleeved on the lead screw 6 and slidably matched with the lead screw 6 .

[0045] The counterweight block 9 is now coaxial with the lead screw nut 7. Under the restriction of the lead screw 6, the movement trajectory of the counterweight block 9 is fixed and will not deflect at will, so the force transmission effect is better.

[0046] A plurality of steel columns 13 are evenly arranged around the lead screw 6 in the circumferential direction, so that the connection between the counterweight block 9 and the lead screw nut 7 is stable and the force is evenly applied.

[0047] A vertical limit strip 14 is disposed on the inner side wall of the housing 10 , and the vertical limit strip 14 abuts against the side wall of the screw nut 7 to limit the rotation of the screw nut 7 .

[0048] The length of the vertical limiting strip 14 can cover the vertical movement range of the lead screw nut 7 .

[0049] The permanent magnet assembly includes multiple permanent magnets 1, and the multiple permanent magnets 1 are arranged in pairs. The multiple pairs of permanent magnets 1 are arranged in a ring around the center of the conductor disk 2. The two permanent magnets 1 of each pair are arranged on the upper and lower sides of the conductor disk 2 and are arranged at equal intervals from the conductor disk 2. The permanent magnets 1 are set on the connecting frame.

[0050] When vibration occurs, the conductor disk 2 rotates with the shaft 4, cutting the magnetic flux lines generated by the permanent magnet 1, and generating eddy currents and electromagnetic torques opposite to the rotation direction in the conductor disk 2, converting kinetic energy into heat energy generated by eddy currents, thereby achieving electromagnetic damping.

[0051] The connecting frame includes a connecting plate 11 and a cover plate 3 . The connecting plate 11 is fixed on a spacer rod 12 . There are two cover plates 3 , which are arranged on the connecting plate 11 in an upper and lower manner. The conductor disk 2 is located between the two cover plates 3 . The permanent magnet assembly is arranged on the cover plate 3 .

[0052] There are two connecting plates 11 , which are arranged on the left and right sides of the cover plate 3 to provide stable support for the cover plate 3 .

[0053] The upper end of the rotating shaft 4 passes through the cover plate 3 located below and is rotatably connected to the cover plate 3 located above, providing support for the transmission mechanism and the counterweight 9 . The conductor disc 2 is coaxially fixed on the rotating shaft 4 .

[0054] The conductor disk 2 is arranged at the center of the cavity in the middle of the spacer bar 12 .

[0055] The middle cavity of the spacer bar 12 has a larger area for installing the spacer bar 12, but a larger conductor disk 2 can be installed at the center of the middle cavity. The larger the conductor disk 2 is, the more significant the damping effect it produces after rotation, and the better the use effect.

[0056] The weight of the counterweight 9 should be adjusted with the weight of the conductor disc 2, so that the total weight of the counterweight 9 and the transmission mechanism is greater than the weight of the conductor disc 2, so that the center of gravity of the entire device is located below the center of the spacer rod 12. The lower the center of gravity of the entire device is, the better the torsional vibration suppression effect is.

[0057] Embodiment 2:

[0058] Based on the same inventive concept, the present invention also provides a method for suppressing vibration of a power transmission line based on inertia and electromagnetic damping, the method comprising:

[0059] When the transmission line vibrates vertically up and down, the counterweight 9 makes a reciprocating linear motion close to or away from the center of the spacer bar 12 due to the action of gravity and inertia, and drives the conductor disc 2 in the electromagnetic damper to rotate through the transmission mechanism to cut the magnetic flux lines generated by the permanent magnet assembly on the connecting frame, generating eddy currents and electromagnetic torques opposite to the rotation direction in the conductor disc 2, converting kinetic energy into heat energy generated by eddy current heating, thereby realizing electromagnetic damping. At the same time, the rotation of the conductor disc 2 generates an inertial mass effect, rapidly amplifying the physical mass of the conductor disc 2 and improving the inertial damping effect.

[0060] When the power transmission line is twisted, the counterweight block 9 itself provides a directional torque to suppress the twisting of the power transmission line due to the effects of gravity and inertia, thereby suppressing the twisting of the power transmission line.

[0061] Specifically, when suppressing the vertical vibration of the transmission line due to sudden deicing or dancing,

[0062] 1) Due to the effect of gravity and inertia, the counterweight 9 pulls the lead screw nut 7 to move up and down along the lead screw 6, and the upper and lower springs 8 achieve buffering;

[0063] 2) The up and down movement of the screw nut 7 will drive the screw 6 to rotate;

[0064] 3) The lead screw 6 drives the rotating shaft 4 and the conductor disc 2 fixed on the rotating shaft 4 to rotate through the coupling 5;

[0065] 4) The rotation of the conductor disk 2 will produce two effects:

[0066] First, the conductor disk 2 cuts the magnetic flux lines generated by the permanent magnet 1, thereby generating eddy currents and electromagnetic torques opposite to the rotation direction in the conductor disk 2, converting kinetic energy into heat energy generated by eddy currents, thereby achieving electromagnetic damping;

[0067] Second, the rotation of the conductor disk 2 will produce an inertial mass effect, which will rapidly amplify the physical mass of the conductor disk 2 and improve the inertial damping effect.

[0068] The specifications and quantity of the permanent magnets 1, the mass of the counterweight 9, the model and lead of the lead screw 6, and the thickness and weight of the conductor disc 2 are all determined by calculation based on the theoretical model of wire deicing and jumping or the finite element simulation results.

[0069] The device is distributedly arranged on the conductors between the pole towers. The specific number and arrangement position are determined by the span length of the line and the vibration mode of ice shedding, jumping or dancing. It is preferentially arranged at the peak or trough position of the maximum amplitude vibration mode.

[0070] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0071] The present invention application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0072] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0073] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A transmission line vibration suppression device based on inertia and electromagnetic damping, characterized in that: include: Spacer rods (12), a connecting frame, an electromagnetic damper, a counterweight (9) and a transmission mechanism; The spacer bar (12) is clamped on the transmission line, and the connecting frame connects the electromagnetic damper and the spacer bar (12); The electromagnetic damper comprises a permanent magnet assembly and a conductor disc (2) for cutting magnetic flux lines, the permanent magnet assembly being arranged on the connecting frame, and the conductor disc (2) being located in the middle cavity of the spacer rod (12); The counterweight block (9) is arranged below the conductor disc (2); The transmission mechanism connects the counterweight (9) and the conductor disc (2) and is used to convert the reciprocating linear motion generated by the counterweight (9) under the action of vibration into circular motion in different rotation directions, thereby driving the conductor disc (2) to rotate and cut the magnetic flux lines.

2. The device according to claim 1, characterized in that The transmission mechanism comprises a rotating shaft (4), a lead screw (6) and a lead screw nut (7); the upper end of the rotating shaft (4) is fixed to the center of the conductor disc (2); the lower end of the rotating shaft (4) is coaxially fixedly connected to the lead screw (6); the lead screw nut (7) is threadedly connected to the lead screw (6); the counterweight (9) is located below the lead screw nut (7) and is rigidly connected to the lead screw (6) at a distance; the counterweight (9) drives the lead screw nut (7) to reciprocate linearly along the lead screw (6), thereby driving the lead screw (6) to rotate.

3. The device according to claim 2, characterized in that A shell (10) is arranged outside the counterweight block (9); a section of the lead screw (6) and the lead screw nut (7) are both located inside the shell (10); a section of the lead screw (6) located inside the shell (10) is rotatably connected to the shell (10); a spring (8) is arranged between the bottom surface of the counterweight block (9) and the inner wall of the shell (10); and a spring (8) is also arranged between the top surface of the lead screw nut (7) and the inner wall of the shell (10).

4. The device according to claim 2, characterized in that The counterweight block (9) and the lead screw nut (7) are rigidly connected via a plurality of steel columns (13).

5. The device according to claim 3, characterized in that The spring (8) and the counterweight (9) are both sleeved on the lead screw (6) and are in sliding cooperation with the lead screw (6).

6. The device according to claim 3, characterized in that A vertical limit strip (14) is provided on the inner side wall of the housing (10), and the vertical limit strip (14) abuts against the side wall of the lead screw nut (7) to limit the rotation of the lead screw nut (7).

7. The device according to claim 1, characterized in that The permanent magnet assembly comprises a plurality of permanent magnets (1), wherein the plurality of permanent magnets (1) are arranged in pairs, and the plurality of pairs of permanent magnets (1) are arranged in a ring around the center of a conductor disk (2), and the two permanent magnets (1) of each pair are arranged on the upper and lower sides of the conductor disk (2) and are arranged at equal intervals from the conductor disk (2), and the permanent magnets (1) are arranged on the connecting frame.

8. The device according to claim 1, characterized in that The connecting frame comprises a connecting plate (11) and a cover plate (3); the connecting plate (11) is fixed on a spacer rod (12); there are two cover plates (3) which are arranged on the connecting plate (11) in an upper and lower manner; the conductor disc (2) is located between the two cover plates (3); and the permanent magnet assembly is arranged on the cover plate (3).

9. The device according to claim 1, characterized in that The conductor disk (2) is arranged at the center of the middle cavity of the spacer rod (12).

10. A method for suppressing transmission line vibration based on inertia and electromagnetic damping, characterized in that: The method includes: When the transmission line vibrates vertically up and down, the counterweight (9) performs reciprocating linear motion close to or away from the center of the spacer bar (12) due to the effects of gravity and inertia, and drives the conductor disc (2) in the electromagnetic damper to rotate through the transmission mechanism to cut the magnetic flux lines generated by the permanent magnet assembly on the connecting frame, generating eddy currents and electromagnetic torques in the opposite direction of rotation in the conductor disc (2), converting kinetic energy into heat energy generated by eddy current heating, thereby achieving electromagnetic damping. At the same time, the rotation of the conductor disc (2) generates an inertial mass effect, rapidly amplifying the physical mass of the conductor disc (2) and improving the inertial damping effect. When the power transmission line is twisted, the counterweight (9) itself provides a directional torque for suppressing the twisting of the power transmission line due to the effects of gravity and inertia, thereby suppressing the twisting of the power transmission line.

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