CN114583647A - Device and method for inhibiting galloping of power transmission line with automatically-changed windward section - Google Patents
Device and method for inhibiting galloping of power transmission line with automatically-changed windward section Download PDFInfo
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- CN114583647A CN114583647A CN202111681288.XA CN202111681288A CN114583647A CN 114583647 A CN114583647 A CN 114583647A CN 202111681288 A CN202111681288 A CN 202111681288A CN 114583647 A CN114583647 A CN 114583647A
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- 238000004804 winding Methods 0.000 claims abstract description 37
- 238000005096 rolling process Methods 0.000 claims description 39
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- 239000011248 coating agent Substances 0.000 claims description 17
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- 230000001629 suppression Effects 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 7
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- 125000006850 spacer group Chemical group 0.000 description 4
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention belongs to the technical field of galloping prevention of a power transmission line, and particularly relates to a device and a method for inhibiting galloping of the power transmission line, wherein the upwind section of the power transmission line automatically changes; the upper winding shaft mechanism and the lower winding shaft mechanism are connected through a winding cord connecting shaft, a winding curtain is arranged on the winding curtain line, and the upper winding shaft mechanism and/or the lower winding shaft mechanism are controlled by the control system to move so as to drive the winding cord to move, so that the coverage area of the winding curtain is adjusted. The device provides an accounting method and an implementation form of a lead resistance coefficient additional term; and the relation between the additional area and the wind speed grade is given, so that the waving and the waving amplitude value under different wind speeds can be effectively inhibited.
Description
Technical Field
The invention belongs to the technical field of galloping prevention of a power transmission line, and particularly relates to a device and a method for inhibiting galloping of the power transmission line with an automatically-changed windward section.
Background
The galloping of the power transmission line can occur under the condition of ice coating of the line and under the condition of specific wind direction and wind speed. Line galloping can lead to alternate flashover, damage ground wire, gold utensil and insulator, can lead to the circuit to trip out the power failure, the disconnected line falls down the tower etc. in the serious time, seriously threatens the safety and stability operation of electric wire netting, causes great economic loss.
At present, transmission lines in operation and construction mostly adopt a multi-split conductor structure with 6-split conductors, 8-split conductors and the like, a grid structure is complex, the average height of towers is high, and a large number of towers with the same tower and double loops are adopted. The energy distribution characteristics of China also determine that the grid structure of the main power transmission line is in the east-west trend, the line distance is long, the weather and geographic conditions of a line corridor are complex, and the included angle between the main part of the line and the main wind direction in winter is large, which are main factors causing galloping.
The complicated structure transmission line is because the structural difference of ordinary wire is changeed and is taken place to wave and damage, and it is main to do its reason: 1. compared with the conventional line, the overhead line with the complex structure is mostly split conductors, and the sectional area of the conductors is larger, so that the line is more easily waved; 2. compared with a single-circuit tower, the double-circuit exclamation point shape generally adopts a drum shape and a fan shape with longer cross arms, so that the load and the bending moment born by the double-circuit tower are relatively larger, and the galloping disaster is easier to occur; 3. compared with a single-loop tower, the double-loop strain tower has the advantages that the cross arm bolts are more, the possibility of loosening and damage is higher, and therefore, the double-loop lead is damaged by the action of galloping load more easily.
The device for preventing and treating the galloping of the power transmission line at present mainly comprises an interphase spacer, a double-pendulum anti-galloping device, a wire clamp rotary spacer, a resonance damping control and other anti-galloping devices. The anti-galloping principle of the phase-to-phase spacers is to limit the amplitude of the line galloping inhibition by changing the structural characteristics of the line. The anti-galloping principle of the double-pendulum anti-galloping device is that the line galloping prevention and control is realized by changing the stable condition of the damping matrix tripping line of the wire structure. The anti-galloping principle of the wire clamp rotary spacer is that the galloping amplitude is restrained by means of changing ice types of ice-coated sub wires, corresponding pneumatic parameters and the like. The resonance damping control mode is mainly to realize the control of the line galloping amplitude by utilizing a spring damping device through tuning control and damping energy consumption. The measures mainly focus on prevention and control, certain defects exist in the prevention and control of the galloping of the power transmission line, and the prevention and control effect cannot be ensured in the easily-galloping meteorological areas due to the fact that the line galloping is easily generated in the frequently-icing, high-wind and stable meteorological areas, and other measures for resisting the galloping are needed to be taken.
Disclosure of Invention
The invention aims to provide a device and a method for inhibiting the galloping of a power transmission line with an automatically-changed windward section, aiming at the problems in the prior art, and the device provides an accounting method and an implementation form of a lead resistance coefficient additional item; and the relation between the additional area and the wind speed grade is given, so that the waving and the waving amplitude value under different wind speeds can be effectively inhibited.
The technical scheme of the invention is as follows:
a transmission line galloping suppression device with an automatically-changed windward section comprises an upper reel mechanism, a lower reel mechanism, a control system for controlling the operation of the upper reel mechanism and/or the lower reel mechanism and a power supply part for supplying electric energy; the upper winding shaft mechanism and the lower winding shaft mechanism are connected through a winding shaft, a winding curtain is arranged on the winding curtain line, and the control system controls the upper winding shaft mechanism and/or the lower winding shaft mechanism to move so as to drive the winding curtain line to move, so that the coverage area of the winding curtain is adjusted.
The upper rolling shaft mechanism and the lower rolling shaft mechanism are identical in structure and respectively comprise a rolling curtain pipe for rolling a rolling curtain, mandrels are mounted at two end parts of the rolling curtain pipe, any mandrel is connected with a power motor, the other mandrel is mounted in a support, the other end of the power motor is connected with a coil spring, and the coil spring is placed in the support on the side.
Specifically, the coil spring is placed in the spring box and connected with the power motor.
Specifically, two rolling lines are respectively connected with the two mandrels.
Specifically, the roller shutter is arranged between two roller shutter cords in a square shape, and the edge of the roller shutter is fixedly connected with the roller shutter cords.
The control system comprises a single chip microcomputer, a force-sensitive sensor and an acceleration sensor, wherein the force-sensitive sensor and the acceleration sensor are connected with the single chip microcomputer, the single chip microcomputer is electrically connected with the power motor, the single chip microcomputer is arranged on the support, and the force-sensitive sensor and the acceleration sensor are arranged in any support.
Specifically, the power supply element is one or two of a storage battery, an induction battery and a solar battery, and the power supply element is arranged in any support or outside the support, or in a spring box or outside the spring box.
Specifically, the method for suppressing galloping by using the device for suppressing the galloping of the power transmission line with the automatically-changed windward section comprises the following steps:
s1, selecting a power transmission line needing to inhibit galloping, and installing a power transmission line galloping inhibition device with an automatically-changed windward section on a wire;
s2, when the waving condition is met, triggering is conducted by a control system, the opening degree of the roller shutter is different under different wind power levels, the control system senses wind speed, point acceleration and displacement through a force-sensitive sensor and an acceleration sensor to determine triggering action, the vibration frequency of a power transmission line lead is 0.1-3 Hz, the amplitude is larger than 20 phi, the opening degree of the roller shutter is determined through pneumatic resistance calculation, and the relation between the wind speed and the roller shutter pulling displacement is formed:
s3, sending a rotation instruction to the upper rolling shaft mechanism according to the opening degree of the rolling curtain determined in the previous step, and opening the rolling curtain by the lower rolling shaft mechanism rotating synchronously;
and S4, when the dancing condition disappears, the force-sensitive sensor and the acceleration sensor can trigger the control system to send a motion instruction in the direction opposite to that of the step S3 to the upper scroll mechanism, the lower scroll mechanism rotates synchronously to send a rotation instruction, and the roller shutter is retracted to realize the dancing stopping.
Specifically, the stepsStep S2 also includes a design of aerodynamic resistance enhancement after the transmission line conducting wire is coated with ice, because the horizontal load is increased after the aerodynamic resistance of the line is enhanced, the problem of exceeding the safe bearing capacity exists, and the wind resistance under the line ice coating design condition is
Wherein n is the number of split conductors, L is the line span, CDIs the aerodynamic drag coefficient of the sub-conductor, delta is the design ice coating thickness, UIce coatingIs design wind speed, C'DThe aerodynamic drag coefficient is corresponding to the cylindrical equivalent ice coating;
when the form of increasing the windward section is adopted, based on the equivalent relation of equal aerodynamic resistance in the span, the following can be known:
further, it is possible to obtain:
corresponding to CD is attachedThe requirements are as follows:
the windward increase should satisfy the following relationship:
length of pull-down:
relation between pull-down length of roller shutter and wind speed
Wherein
At present, the design of a plurality of anti-galloping devices is still imperfect, and the anti-galloping effect is not ideal. There is a need for research in the structural design, parameter selection, and arrangement along the line of anti-galloping devices. The dancing prevention technology is researched by systematic research and analysis, and the final purpose that line anti-dancing treatment is related research and analysis of dancing is achieved. At present, anti-galloping devices developed according to different anti-galloping mechanisms are various, and the characteristics of the existing anti-galloping devices are different, so that the existing anti-galloping devices lack systematicness and universality, and the function of inhibiting galloping cannot be fundamentally achieved.
The invention has the beneficial effects that: through setting up reel mechanism, lower reel mechanism, and install it on the transmission line wire, go up reel mechanism and/or lower reel mechanism motion through control system control and drive the motion of book curtain line 10, thereby the area size of coverage of adjustment book curtain, mainly change windward area or atress direction through the opening and shutting (or rotatory) of control book curtain, rely on the rotation of power motor, and then drive the rotation of dabber, realize opening and closing of book curtain, when the system reaches the galloping condition, control system triggers, under the different wind-force grades, the open degree of book curtain is different, reach the purpose of increase windward area. When the waving condition disappears, the sensor can trigger the rotation of the lower scroll to withdraw the roller shutter.
Drawings
Fig. 1 is a schematic structural view of a reel mechanism provided by the present invention.
FIG. 2 is a schematic view of the connection of the spindle to the power motor;
fig. 3 is a schematic view of the installation of the galloping suppressing device and the transmission line conductor shown in embodiment 1;
fig. 4 is a schematic view of the installation of the galloping suppressing device and the transmission line conductor shown in embodiment 2;
fig. 5 is a flowchart of a roller shutter opening and closing control system.
1 support, 2 coil springs, 3 spring boxes, 4 mandrels, 5 power motors, 6 roller shutter tubes, 7 upper guide wires, 8 lower guide wires, 9 roller shutters and 10 roller cords.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and the detailed description.
The invention provides a transmission line galloping suppression device with an automatically-changed windward section, which comprises an upper scroll mechanism, a lower scroll mechanism, a control system for controlling the operation of the upper scroll mechanism and/or the lower scroll mechanism and a power supply part for supplying electric energy, wherein the upper scroll mechanism and the lower scroll mechanism are/is connected with the control system; the upper winding shaft mechanism and the lower winding shaft mechanism are connected through a winding shaft, a winding curtain 9 is arranged on the winding curtain line, and the upper winding shaft mechanism and/or the lower winding shaft mechanism are controlled by a control system to move so as to drive the winding curtain line 10 to move, so that the size of the covered area of the winding curtain 9 is adjusted.
The upper rolling shaft mechanism and the lower rolling shaft mechanism have the same structure, as shown in fig. 1, and each rolling shaft mechanism comprises a rolling curtain pipe 6 for rolling a rolling curtain 9, wherein the rolling curtain 9 is arranged between two rolling cords 10 in a square shape, and the edge of the rolling curtain is fixedly connected with the rolling curtain wire 10. Two ends of the roller shutter tube 6 are respectively provided with a mandrel 4, any mandrel 4 is connected with a power motor 5, as shown in fig. 2, the other mandrel 4 is arranged in the support 1, and two roller shutter threads 10 are respectively connected with the two mandrels 4. The other end of the power motor 5 is connected with a coil spring 2, the coil spring 2 is arranged in the support 1 on the side, and the coil spring 2 is arranged in a spring box 3 and connected with the power motor 5.
The control system comprises a single chip microcomputer, a force-sensitive sensor and an acceleration sensor, wherein the force-sensitive sensor and the acceleration sensor are connected with the single chip microcomputer, the single chip microcomputer adopts an STM32F103 series single chip microcomputer, the process is mature, the price is low, the control system belongs to an enhanced series microcontroller, and the control system is widely applied to motor driving, frequency conversion systems and the like. The single chip microcomputer is electrically connected with the power motor 5, the single chip microcomputer is arranged on the support 1, and the force-sensitive sensor and the acceleration sensor are arranged in any support 1. The power supply part is one or two of a storage battery, an induction battery and a solar battery, and is arranged in any support 1 or outside the support, or in the spring box 3 or outside the spring box.
The invention applies a single chip microcomputer control system, determines triggering action by sensing wind speed, point acceleration and displacement, determines the opening degree of a roller shutter by pneumatic resistance calculation, and forms the relationship between the wind speed and the pulling displacement of the roller shutter:
in the actual operation process, the opening and closing mode and the direction of the roller shutter are not limited to the up-down mode, the left-right mode and the like, and the windward side can be determined according to the relation.
Example 1
The present embodiment uses the above-provided apparatus to suppress waving of a double split conductor having four, six and eight split conductors in the form of upper and lower conductors, as shown in fig. 3.
The method for suppressing galloping by using the transmission line galloping suppression device with the automatically-changed windward section comprises the following steps as shown in fig. 5:
s1, selecting a power transmission line needing to inhibit galloping, installing a power transmission line galloping inhibition device with an automatically-changed windward section on a lead, sleeving an upper rolling shaft mechanism of the device on an upper lead 7 through a rolling screen cylinder 6, sleeving a lower rolling shaft mechanism on a lower lead 8, wherein the rolling screen cylinder 6 is a cylinder body and is provided with an opening, or the rolling screen cylinder 6 is a completely-closed cylinder, and the installation mode during cylinder is to clamp a support 1 by using a clamp or connect the support with a bolt;
s2, wind resistance after installation of the roller shutter:
wind resistance at different positions of the roller shutter:
the horizontal load is increased after the pneumatic resistance of the line is enhanced, so that the problem of exceeding the safe bearing capacity exists, and the wind resistance under the ice coating design condition of the line is
Wherein n is the number of split conductors, L is the line span, CDIs the aerodynamic drag coefficient of the sub-wires. Delta is the design ice thickness, UIce coatingIs design wind speed, C'DThe aerodynamic drag coefficient is corresponding to the cylindrical equivalent icing.
When adopting the form of increasing the windward section
Based on the equivalent relationship of equal aerodynamic resistance in the span, the following can be known:
further, it is possible to obtain:
corresponding to CD is attachedThe requirements are as follows:
the windward increase should satisfy the following relationship:
length of pull-down:
relation between pull-down length of roller shutter and wind speed
Wherein
When the waving condition is met, the control system triggers, the opening degree of the roller shutter is different under different wind power levels, the control system senses the wind speed, the point acceleration and the displacement through the force-sensitive sensor and the acceleration sensor to determine the triggering action, the vibration frequency of the electric transmission line wire is 0.1-3 Hz, the amplitude is more than 20 phi, and the opening degree of the roller shutter 9 is determined through pneumatic resistance calculation;
s3, sending a rotation instruction to the upper rolling shaft mechanism according to the opening degree of the rolling screen 9 determined in the previous step, and opening the rolling screen 9 by the lower rolling shaft mechanism rotating synchronously;
and S4, when the dancing condition disappears, the force-sensitive sensor and the acceleration sensor can trigger the control system to send a motion instruction in the direction opposite to that of the step S3 to the upper scroll mechanism, the lower scroll mechanism rotates synchronously to send a rotation instruction, and the roller shutter 9 is retracted to realize the dancing stopping.
The galloping prevention and treatment effect can be improved to a certain extent through the galloping inhibition device provided by the invention.
Example 2
Unlike embodiment 1, in this embodiment, the device provided by the present invention is used on a double split conductor on the same plane, and a vertical plane can be constructed between two sub-spacers, and the device can be installed as shown in fig. 4 in the same manner as in embodiment 1.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the invention, it is intended to cover all modifications within the scope of the invention as claimed.
Claims (9)
1. A transmission line galloping suppression device with an automatically-changed windward section is characterized by comprising an upper scroll mechanism, a lower scroll mechanism, a control system for controlling the operation of the upper scroll mechanism and/or the lower scroll mechanism and a power supply part for supplying electric energy; the upper winding shaft mechanism and the lower winding shaft mechanism are connected through a winding cord (10) in a shaft mode, a winding curtain (9) is arranged on the winding cord, the upper winding shaft mechanism and/or the lower winding shaft mechanism are controlled through a control system to move to drive the winding cord (10) to move, and therefore the coverage area of the winding curtain (9) is adjusted.
2. The transmission line galloping suppression device with the automatically-changed windward section as claimed in claim 1, wherein the upper reel mechanism and the lower reel mechanism have the same structure, and each of the upper reel mechanism and the lower reel mechanism comprises a roller shutter pipe (6) for rolling a roller shutter (9), the two ends of the roller shutter pipe (6) are respectively provided with a mandrel (4), any mandrel (4) is connected with a power motor (5), the other mandrel (4) is arranged in the support (1), the other end of the power motor (5) is connected with a coil spring (2), and the coil spring (2) is arranged in the support (1) on the side.
3. The transmission line galloping suppression device with the automatically-changed windward section as claimed in claim 2, wherein the coil spring (2) is placed in the spring box (3) and connected with the power motor (5).
4. The transmission line galloping suppression device with the automatically-changed windward section as claimed in claim 1, wherein two of the winding cords (10) are respectively connected with the two mandrels (4).
5. The transmission line galloping suppression device with the automatically-changed windward section as claimed in claim 1, wherein the rolling curtain (9) is square and arranged between two rolling cords (10), and the edge of the rolling curtain is fixedly connected with the rolling cords (10).
6. The transmission line galloping suppression device with the automatically-changed windward section as claimed in claim 2, wherein the control system comprises a single chip microcomputer, a force-sensitive sensor and an acceleration sensor, the force-sensitive sensor and the acceleration sensor are connected with the single chip microcomputer, the single chip microcomputer is electrically connected with the power motor (5), the single chip microcomputer is arranged on the support (1), and the force-sensitive sensor and the acceleration sensor are arranged in any support (1).
7. The transmission line galloping suppression device with the automatically-changed windward section as claimed in claim 2, wherein the power supply element is one or two of a storage battery, an induction battery and a solar battery, and the power supply element is arranged in any support (1) or outside the support, or in a spring box (3) or outside the spring box.
8. The method for suppressing the galloping of the power transmission line with the automatically-changed windward section according to any one of claims 1 to 7 is characterized by comprising the following steps of:
s1, selecting a power transmission line needing to inhibit galloping, and installing a power transmission line galloping inhibition device with an automatically-changed windward section on a wire;
s2, when the waving condition is met, triggering is carried out by a control system, the opening degree of the roller shutter is different under different wind power levels, the control system senses the wind speed and the point acceleration and displacement through a force-sensitive sensor and an acceleration sensor to determine the triggering action, the vibration frequency of a wire of the power transmission line is 0.1-3 Hz, the amplitude is greater than 20 phi, the opening degree of the roller shutter (9) is determined through pneumatic resistance calculation, and the relation between the wind speed and the pulling displacement of the roller shutter (9) is formed:
s3, sending a rotation instruction to the upper rolling shaft mechanism according to the opening degree of the rolling screen (9) determined in the previous step, and simultaneously, opening the rolling screen (9) by the lower rolling shaft mechanism along with synchronous rotation;
and S4, when the dancing condition disappears, the force-sensitive sensor and the acceleration sensor can trigger the control system to send a motion instruction in the direction opposite to that of the step S3 to the upper scroll mechanism, the lower scroll mechanism rotates synchronously to send a rotation instruction, and the roller shutter (9) is retracted to realize the dancing stopping.
9. The method for suppressing the galloping of the power transmission line with the automatically changed windward section as claimed in claim 8, wherein the step S2 further comprises a design of aerodynamic resistance enhancement after the conductor of the power transmission line is coated with ice, the problem of exceeding the safe carrying capacity exists due to the fact that the horizontal load is increased after the aerodynamic resistance of the line is enhanced, and the wind resistance under the design condition of the line ice coating is
Wherein n is the number of split conductors, L is the line span, CDIs the aerodynamic drag coefficient of the sub-conductor, delta is the design ice coating thickness, UIce coatingIs design wind speed, C'DThe aerodynamic drag coefficient is corresponding to the cylindrical equivalent ice coating;
when the form of increasing the windward section is adopted, based on the equivalent relation of equal aerodynamic resistance in the span, the following can be known:
further, it is possible to obtain:
corresponding to CD is attachedThe requirements are as follows:
the windward increase should satisfy the following relationship:
length of pull-down:
relation between pull-down length of roller shutter and wind speed
Wherein
Priority Applications (1)
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| CN202111681288.XA CN114583647B (en) | 2021-12-31 | 2021-12-31 | Device and method for suppressing galloping of power transmission line with windward cross section automatically changed |
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| CN202111681288.XA CN114583647B (en) | 2021-12-31 | 2021-12-31 | Device and method for suppressing galloping of power transmission line with windward cross section automatically changed |
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| CN213585093U (en) * | 2020-10-29 | 2021-06-29 | 国网河南省电力公司周口供电公司 | Pre-twisted suspension clamp special for carbon fiber composite core wire |
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| CN114583647B (en) | 2024-01-19 |
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