CN110649551A - Inertia amplification type transmission line vibration damping cable - Google Patents
Inertia amplification type transmission line vibration damping cable Download PDFInfo
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- CN110649551A CN110649551A CN201911053522.7A CN201911053522A CN110649551A CN 110649551 A CN110649551 A CN 110649551A CN 201911053522 A CN201911053522 A CN 201911053522A CN 110649551 A CN110649551 A CN 110649551A
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- damping
- transmission line
- power transmission
- vibration
- cable
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/14—Arrangements or devices for damping mechanical oscillations of lines, e.g. for reducing production of sound
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Suspension Of Electric Lines Or Cables (AREA)
Abstract
The invention discloses an inertia amplification type transmission line vibration damping cable. The invention discloses an inertia amplification type transmission line vibration damping cable, wherein a transmission line is suspended between 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 invention can reduce the vibration of the transmission line and eliminate the power load of the transmission line.
Description
Technical Field
The invention belongs to the technical field of power transmission tower line vibration reduction, and particularly relates to an inertia amplification type power transmission line vibration reduction 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
The invention aims to provide an inertia amplification type transmission line vibration damping cable for reducing the vibration of a transmission line and eliminating the power load of the transmission line.
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 vibration reduction principle of the inertia amplification type power transmission line vibration reduction damping cable is as follows: 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.
Compared with the existing damping system, the damping system has the following advantages that:
(1) compared with a vibration damper and a damping wire, the damping cable can consume energy by using various dampers, and has a good energy consumption effect.
(2) Compared with a vibration damper and a damping wire, the damping cable has the advantages that the vibration damping effect is not influenced by the change of the frequency of the power transmission line, and the vibration of all frequencies of the power transmission line can be simultaneously inhibited.
(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 an additional mass of an embodiment of the present invention.
Fig. 8 is a schematic structural view of a vibration damping device of the present invention in which a linear damping cable structure is changed to a broken line type displacement amplification structure.
Detailed Description
The invention is further described below with reference to the figures 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:
a power transmission line is stretched and simulated by fixedly connecting supports at two ends of a steel wire rope with the diameter of 10mm, the span is 13m, the damping cable, the fixed pulley and the vibration damping device (adopting a damper) are applied, a mass block (with additional mass) is additionally arranged at the upper end of the damping cable in one experiment, a mass block (without additional mass) is not additionally arranged on the damping cable in the other experiment, resonance excitation is adopted, the power transmission line is enabled to vibrate greatly, when the additional excitation is removed, the power transmission line vibrates freely, and the quality of the vibration damping effect is judged according to a time-displacement curve of vibration attenuation. 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 innovation points of the invention are 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) The damper is adopted to consume energy, and the damper can consume energy only if the transmission line vibrates, so that the method is essentially different from the conventional vibration reduction measures based on tuned vibration reduction, and is not influenced by vibration frequency.
(4) The invention can not only damp a single transmission line, but also damp a plurality of transmission lines 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 invention may be embodied in other similar or equivalent ways than those of the embodiments described above, for example:
(1) the vibration reduction principle of the invention can also be applied to the vibration reduction of cable net structures and other large-span and high-rise structures.
(2) The linear damping cable structure is changed into a broken line type displacement amplification structure, and the energy consumption of the vibration damper is utilized, 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, other technical equivalents may be changed within 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 processed by adopting an insulator or other insulating materials and meets the electrical requirements; the connecting rod meets the electrical insulation requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911053522.7A CN110649551A (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 |
|---|---|---|---|
| CN201911053522.7A CN110649551A (en) | 2019-10-31 | 2019-10-31 | Inertia amplification type transmission line vibration damping cable |
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| CN110649551A true CN110649551A (en) | 2020-01-03 |
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| CN201911053522.7A Pending CN110649551A (en) | 2019-10-31 | 2019-10-31 | Inertia amplification type transmission line vibration damping cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111506945A (en) * | 2020-03-31 | 2020-08-07 | 重庆科技学院 | Equivalent damping coefficient calculation method of power transmission tower resonance response based on tower line coupling influence factor |
-
2019
- 2019-10-31 CN CN201911053522.7A patent/CN110649551A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111506945A (en) * | 2020-03-31 | 2020-08-07 | 重庆科技学院 | Equivalent damping coefficient calculation method of power transmission tower resonance response based on tower line coupling influence factor |
| CN111506945B (en) * | 2020-03-31 | 2022-05-17 | 重庆科技学院 | Equivalent damping coefficient calculation method for power transmission tower resonance response based on tower line coupling influence factor |
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