CN210838892U - Inertia amplification type transmission line vibration damping cable - Google Patents
Inertia amplification type transmission line vibration damping cable Download PDFInfo
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- CN210838892U CN210838892U CN201921857157.0U CN201921857157U CN210838892U CN 210838892 U CN210838892 U CN 210838892U CN 201921857157 U CN201921857157 U CN 201921857157U CN 210838892 U CN210838892 U CN 210838892U
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Abstract
The utility model discloses an inertia amplification formula power transmission line damping cable. The utility model discloses an inertia amplification type transmission line damping cable, the transmission line is suspended between the transmission towers; the damping cable is obliquely connected with the power transmission line and the power transmission tower, a mass block is additionally arranged at the joint of the upper end of the damping cable and the power transmission line, the lower end of the damping cable is connected with the upper end of the vibration damper after passing around the fixed pulley, and the fixed pulley and the vibration damper are sequentially arranged on the power transmission tower from top to bottom; the two power transmission lines on the left side and the right side of the power transmission tower are connected at the upper ends of the damping cables at the same height through the transverse connecting rod, and the two ends of the transverse connecting rod are simultaneously in cross connection with the damping devices on the left side and the right side of the power transmission tower through the damping cables. The utility model discloses can reduce the vibration of power transmission line, eliminate the power load of power transmission line.
Description
Technical Field
The utility model belongs to the technical field of the transmission tower line damping, concretely relates to inertia amplification formula transmission line damping cable.
Background
The transmission tower line system is a high-flexibility large-span structure which is widely applied and is an important lifeline project. Under external factors such as wind power and the like, the transmission line generates vibration, the damage caused by the vibration is various, light people generate flashover and tripping, heavy people damage the insulator, the wire is broken, and the tower bolt is loosened, falls off or even falls down.
The vibration of the transmission line can be roughly divided into 3 types according to the difference of frequency and amplitude: high-frequency micro-amplitude breeze vibration, medium-frequency mid-amplitude sub-span vibration and low-frequency large-amplitude waving.
(1) Breeze vibration: the differential vibration is that when uniform wind with the wind speed of 0.5-10 m/s vertically blows to the conducting wire, a stable vortex is formed on the lee side of the conducting wire. The wire is caused to vibrate due to the effect of the periodic eddy current lift force component.
(2) Waving: when wind force with the wind speed of about 5-15 m/s acts on the wire with the asymmetric shape, the most common condition is that the wind force acts on the wire with the asymmetric ice coating thickness, the static balance of the wire is damaged due to pulsating wind force generated by the change of the wind force acting angle, and great galloping is formed; the vibration-damping device is characterized by large vibration, low frequency and long duration (the amplitude is below 10m, and the frequency is 0.1-1 Hz); the duration of vibration can reach tens of hours, often causing large area wire breakage and tower collapse.
(3) And (3) secondary span vibration: the subspan oscillation refers to one oscillation in the span between two adjacent spacers of the split conductor; this vibration is generally referred to as "oscillation" because of its low frequency; the subspan oscillation occurs less in the circuit, usually under the action of wind power with the wind speed of 5-15 m/s, turbulence generated by a windward wire influences a leeward wire to generate airflow disturbance, and the balance of the wire is damaged to form oscillation; the expression form of the device is that each sub-conducting wire swings in different periods and is periodically separated and gathered, and the motion track of the conducting wire in the space is oval; the amplitude of the subspan oscillation is related to the subspan length, the wind speed and the structural form of the split conductor, and generally the amplitude of the subspan oscillation ranges from the diameter of the conductor to 0.5m, and the frequency ranges from 1Hz to 3 Hz.
The main measures of the existing transmission line vibration damping include: a damper, a damper wire, or a combination of both.
(1) A vibration damper: a small hammer, called a damper, suspended on a wire, as shown in fig. 1, is a Tuned Mass Damper (TMD); in order to prevent and reduce the vibration of the wire, a certain number of vibration dampers are generally installed near the suspension wire clamp; when the lead vibrates, the damper also moves up and down to generate an acting force which is asynchronous or even opposite to the lead vibration, so that the amplitude of the lead can be reduced, and the vibration of the lead can be eliminated; in fig. 1, 1 denotes a power line, 2 denotes an elastic beam, and 3 denotes a mass.
The TMD vibration reduction principle is shown in figure 2, wherein M is the mass of the mass block, k is the spring stiffness, c is the damper damping, M is the mass of the main structure, k1 is the main structure stiffness, c1 is the main structure damping, F is the dynamic part of the structure subjected to the excitation load of wind, fluid and the like, and F is0The amplitude of the external excitation, ω the frequency of the external excitation, and t the time.
When the structure vibrates, the TMD vibrates by utilizing the resonance principle, namely the natural frequency of the TMD is consistent with the natural frequency of the structure, and the inertia force of the TMD is utilized to balance the external excitation, so that the vibration of the structure is inhibited.
The vibration damper can effectively prevent breeze vibration, but due to the characteristics of a Tuned Mass Damper (TMD), the tuned vibration damping has the problems of narrow vibration damping frequency and difficulty in simultaneously inhibiting multiple frequencies of a structure, and the tuned vibration damping effect is reduced along with the continuous reduction of the fundamental frequency of the structure, so that the tuned mass damper cannot achieve a good effect on low-frequency high-amplitude galloping.
(2) Damping wire: damping wires with different lengths and sag degrees are adopted and connected with a conducting wire through a wire clamp, the vibration of the power transmission wire is reduced through the swinging of the conducting wire, the structure of the damping wire is shown in figure 3, and the damping principle is the same as TMD. In fig. 3, 1 denotes a power transmission line, 4 denotes a wire clamp, and 11 denotes a damping line.
Whether the vibration damper or the damping cable is based on the damping principle of TMD, the vibration damper is easily influenced by the structural vibration frequency; and the energy consumption is damped by using the material per se, so that the energy consumption effect is poor. Therefore, after the installation of the vibration reduction devices, various accidents caused by vibration still frequently occur in the existing power transmission lines, and the serious property loss of the state is caused.
Disclosure of Invention
An object of the utility model is to reduce the vibration of power transmission line, eliminate the power load of power transmission line, and provide an inertia amplification formula power transmission line damping cable.
The above object of the present invention is achieved by the following technical solutions: the inertia amplification type transmission line vibration damping cable is characterized in that the transmission line is suspended between power transmission towers; the damping cable is obliquely connected with the power transmission line and the power transmission tower, a mass block is additionally arranged at the joint of the upper end of the damping cable and the power transmission line, the lower end of the damping cable is connected with the upper end of the vibration damper after passing around the fixed pulley, and the fixed pulley and the vibration damper are sequentially arranged on the power transmission tower from top to bottom; the two power transmission lines on the left side and the right side of the power transmission tower are connected at the upper ends of the damping cables at the same height through the transverse connecting rod, and the two ends of the transverse connecting rod are simultaneously in cross connection with the damping devices on the left side and the right side of the power transmission tower through the damping cables.
Specifically, the vibration damping device comprises an upper cross beam and a lower cross beam, a return spring and a damper are connected between the upper cross beam and the lower cross beam, and the lower cross beam is fixedly connected to the power transmission tower.
Specifically, the damping cable is processed by adopting an insulator or other insulating materials and meets the electrical requirements; the connecting rod meets the electrical insulation requirement.
The utility model discloses the damping principle of inertia amplification formula power transmission line damping cable is: when the power transmission line generates transverse vibration, the up-and-down vibration of the power transmission line is used for describing the damping principle of the damping cable for convenience of discussion. The shape of the power transmission line is in a sine wave form due to vibration, and the number of the sine waves and the vibration frequency are changed along with the change of the wind speed; when the transmission line vibrates, the vibration mode of the sine wave enables the amplitude of the transmission tower close to two ends to be small, and the amplitude of the transmission tower far away from the transmission tower to be large; the upper end of the damping cable is connected with the power transmission line, the lower end of the damping cable is connected with the vibration damper, and the stretched return spring in the vibration damper provides pretension for the damping cable and stretches the damping cable into a straight line as much as possible; when the upper end of the damping cable moves upwards along with the power transmission line, the damper is stretched to provide a downward damping force for the power transmission line; when the upper end of the damping cable moves downwards along with the power transmission line, the damper is compressed under the action of a return spring in the energy consumption device to provide an upward damping force for the power transmission line; the direction of the damping force is always opposite to the motion direction of the power transmission line, and the mechanical energy of the vibration of the power transmission line is consumed, so that the vibration of the power transmission line is restrained. The mass block, the connecting rod and the like arranged on the power transmission line at the upper end of the damping cable can change the vibration mode of the power transmission line, and under the condition that the maximum amplitude is the same, the additional mass obviously increases the amplitude of the connection part of the power transmission line and the damping cable, increases the stroke of the damper and obviously improves the vibration attenuation effect of the damping cable on the power transmission line.
For the condition that a plurality of power transmission lines are arranged on two sides of the power transmission tower, after the power transmission lines are connected in the axial direction and the vertical direction of the damping cable by adopting the insulator, the vibration reduction principle is the same as that of the power transmission tower.
The utility model discloses for the advantage of current damping system embody as follows:
(1) compared with a shockproof hammer and a damping wire, the damping cable of the utility model can utilize various dampers to consume energy, and has good energy consumption effect.
(2) Compared with a vibration damper and a damping wire, the utility model discloses the damping effect of damping cable is not influenced by the change of power transmission line frequency, can restrain the vibration of all frequencies of power transmission line simultaneously.
(3) The increase of the inertia mass can change the vibration mode of the transmission line, and the vibration reduction effect of the damping cable is obviously improved.
(4) Compared with the existing damper vibration reduction, the damping cable has large span, and can drive the damper to reduce vibration by utilizing larger amplitude of the transmission line far away from the transmission tower.
Drawings
Fig. 1 is a schematic view of a prior art damper.
FIG. 2 is a TMD damping diagram.
Fig. 3 is a schematic view of a structure of a damper wire in the prior art.
Fig. 4 is a schematic diagram of an application structure of the embodiment of the present invention.
Fig. 5 is an enlarged view at i in fig. 4.
Fig. 6 is a view a-a in fig. 4.
Fig. 7 is a time-displacement graph of comparative vibration damping with and without additional masses according to embodiments of the present invention.
Fig. 8 is a schematic structural view of the vibration damping device of the present invention, which changes the linear damping cable structure into a broken line type displacement amplification structure for reuse.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples. The same reference numbers in the drawings identify the same or similar elements or features unless otherwise indicated.
Referring to fig. 4 to 6, the inertia-amplified transmission line damping cable of the present embodiment, the transmission line 1 is suspended between transmission towers 6. The damping cable 5 is obliquely connected with the power transmission line 1 and the power transmission tower 6, a mass block 3 is additionally arranged at the joint of the upper end of the damping cable 5 and the power transmission line 1, the lower end of the damping cable 5 is connected with the upper end of a vibration damper 8 after bypassing a fixed pulley 7, and the fixed pulley 7 and the vibration damper 8 are sequentially arranged on the power transmission tower 6 from top to bottom; as can be seen from fig. 6, the two transmission lines on the left and right sides of the transmission tower 6 are connected at the upper ends of the damping cables 5 at the same height by the transverse connecting rod 9, and the damping cables 5 are connected at both ends of the transverse connecting rod 9 and the vibration dampers 8 on the left and right sides of the transmission tower 6 in a crossing manner. Referring to fig. 5, the vibration damping device 8 includes an upper beam 801 and a lower beam 802, and a return spring 803 and a damper 804 are connected between the upper beam 801 and the lower beam 802, wherein the lower beam 802 is fixedly connected to the transmission tower 6. The damping cable is processed by adopting an insulator or other insulating materials and meets the electrical requirements; the connecting rod also needs to meet electrical insulation requirements.
The following is an application comparative experiment:
adopt diameter 10mm wire rope both ends to link firmly a power transmission line of support stretch-draw simulation, span 13m, use the utility model discloses foretell damping cable, fixed pulley and vibration damper (adopting the attenuator), adopt the damping cable upper end to install the quality piece additional (having additional mass) in an experiment, the damping cable does not install the quality piece additional (not have additional mass) in another experiment, adopt resonance excitation, make the power transmission line take place vibration by a wide margin, remove when additional excitation, the power transmission line takes place free vibration, according to the time-displacement curve of vibration decay, judge the goodness of damping effect. In fig. 7, the transmission line decays slower without additional mass; with other parameters remaining unchanged, it can be seen that the attenuation speed of the transmission line vibration is significantly increased by adding only the additional mass.
The utility model discloses an innovation point embodies as follows:
(1) a damping cable is connected between the power transmission line and the power transmission tower, the damping cable is always in a tensioning state due to a pre-tensioned return spring, and the length of the damping cable is changed due to vibration of the power transmission line, so that the damper is driven to consume energy.
(2) The vibration mode of the transmission line can be changed by adding the mass block, the amplitude of the upper end of the damping cable is obviously increased on the premise of the same maximum amplitude of the transmission line, and the vibration reduction effect of the damping cable is improved.
(3) Adopt the attenuator power consumption, only there is the vibration in the power transmission line, the attenuator just can consume energy, has the essence difference with current damping measure based on harmonious damping, the utility model discloses do not receive vibration frequency's influence.
(4) The utility model discloses not only can be to single power transmission line damping, equally can be to many power transmission lines damping simultaneously.
(5) Compared with the existing damper vibration reduction mode, the damping device does not need a supporting column, and the span is far larger than the existing supporting column structure, so that the damping effect is better.
The present invention can have other similar or equivalent changes besides the implementation manner of the above embodiments, for example:
(1) the utility model discloses a damping principle can be applied to the cable network structure equally to and other damping of striding, high-rise structure greatly.
(2) The structure of the linear damping cable is changed into a broken line type displacement amplification structure for recycling, the damping device of the utility model consumes energy, as shown in figure 8, or the damping cables of devices such as lever principle amplification, chain transmission amplification, gear transmission amplification and the like are added; in fig. 8, 10 denotes a displacement amplifier.
(3) Auxiliary measures are added to reduce the sag of the damping cable and improve the vibration reduction effect.
(4) The reset spring of the vibration damper is changed into gravity reset.
(5) The lower end of the damping cable is changed from the transmission tower to the ground or other structure or object that is stationary relative to the ground.
(6) The damper takes other forms, or increases the inertial volume mass and the like.
Therefore, under the basic concept of the present invention, other technical features that are equivalent to the above technical features should be included in the scope of the present invention.
Claims (3)
1. An inertia amplification type transmission line vibration damping cable, wherein a transmission line is suspended between transmission towers; the method is characterized in that: the damping cable is obliquely connected with the power transmission line and the power transmission tower, a mass block is additionally arranged at the joint of the upper end of the damping cable and the power transmission line, the lower end of the damping cable is connected with the upper end of the vibration damper after passing around the fixed pulley, and the fixed pulley and the vibration damper are sequentially arranged on the power transmission tower from top to bottom; the two power transmission lines on the left side and the right side of the power transmission tower are connected at the upper ends of the damping cables at the same height through the transverse connecting rod, and the two ends of the transverse connecting rod are simultaneously in cross connection with the damping devices on the left side and the right side of the power transmission tower through the damping cables.
2. The inertia amplified transmission line damping lanyard of claim 1 wherein: the vibration damping device comprises an upper cross beam and a lower cross beam, wherein a return spring and a damper are connected between the upper cross beam and the lower cross beam, and the lower cross beam is fixedly connected to the power transmission tower.
3. The inertia amplified transmission line damping lanyard of claim 1 wherein: the damping cable is treated by adopting an insulator and meets the electrical requirement; the connecting rod meets the electrical insulation requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921857157.0U CN210838892U (en) | 2019-10-31 | 2019-10-31 | Inertia amplification type transmission line vibration damping cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921857157.0U CN210838892U (en) | 2019-10-31 | 2019-10-31 | Inertia amplification type transmission line vibration damping cable |
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| CN210838892U true CN210838892U (en) | 2020-06-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963622A (en) * | 2021-02-22 | 2021-06-15 | 中国核动力研究设计院 | High-damping vibration reduction and isolation support for nuclear power pipeline |
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2019
- 2019-10-31 CN CN201921857157.0U patent/CN210838892U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963622A (en) * | 2021-02-22 | 2021-06-15 | 中国核动力研究设计院 | High-damping vibration reduction and isolation support for nuclear power pipeline |
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