Multi-split conductor anti-galloping device and system based on variable aerodynamic effect

Abstract

The invention provides a multi-split conductor anti-galloping device and system based on a variable pneumatic effect. The multi-split conductor anti-galloping device comprises a shell, a telescopic part, an amplitude acquisition unit and a control unit, the shell is provided with an opening, the telescopic part is mounted in the shell along one end of the telescopic direction, and the amplitude acquisition unit and the control unit are mounted at the other end; the amplitude acquisition unit is communicated with the control unit through signal transmission; the control unit is connected with the telescopic part, and the telescopic part stretches based on the control unit. According to the device provided by the invention, the amplitude of the conductor during galloping is acquired through the amplitude acquisition unit, and a signal is output to the control unit, so that the control unit outputs the signal to control the telescopic part to stretch out and draw back, and then the aerodynamic characteristics of the split conductor are changed by adjusting the length of the telescopic part, thereby realizing aerodynamic adjustment of the split conductor. The pneumatic negative damping effect of the wire under the combined action of eccentric icing and wind is reduced, and the anti-galloping requirements of different lines under complex weather conditions are better met.

Description

Technical Field

[0001] The present invention relates to the technical field of active prevention and control of overhead wire ice dancing disasters during the operation and maintenance stage of power transmission lines, and in particular to a multi-split wire anti-dancing device and system based on variable aerodynamic effect. Background Art

[0002] Overhead transmission line galloping is a low-frequency (less than 3 Hz) and large-amplitude (several meters to tens of meters) conductor vibration phenomenon, generally caused by asymmetric icing of the conductor. Due to the large amplitude of the galloping, it can cause phase flashover and hardware damage at the least, or even disconnection and power outage at the worst, thus posing a great threat to the safe and reliable operation of the power grid. Summary of the invention

[0003] In order to solve the problem that the amplitude of conductor dancing is very large, which may cause phase flashover, hardware damage, or even line disconnection and power outage, the present invention provides a multi-split conductor anti-dancing device based on variable pneumatic effect, including a housing, a telescopic part, an amplitude acquisition unit and a control unit;

[0004] The housing has an opening, and one end of the telescopic portion along its telescopic direction is installed in the housing, and the amplitude acquisition unit and the control unit are installed at the other end;

[0005] The amplitude acquisition unit and the control unit are connected via signal transmission;

[0006] The control unit is connected to the telescopic portion, and the telescopic portion is telescoped based on the control unit.

[0007] Preferably, the telescopic portion comprises a telescopic rod provided with a telescopic cavity;

[0008] The telescopic cavity runs through the telescopic rod;

[0009] An end of the telescopic cavity facing the opening of the housing is communicated with the control unit.

[0010] Preferably, the telescopic cavity and the control unit form a sealed cavity.

[0011] Preferably, a spherical outer shell is provided at the end of the telescopic portion facing the opening of the housing;

[0012] The amplitude acquisition unit and the control unit are installed in the spherical housing;

[0013] When the telescopic portion is in a telescopic state, the spherical outer shell abuts against the opening of the housing.

[0014] Preferably, a compression spring is provided in the housing;

[0015] The compression spring is sleeved on the telescopic portion, and two ends thereof are respectively in contact with the spherical outer shell and the housing.

[0016] Preferably, a cylindrical telescopic film is provided in the housing;

[0017] The telescopic film is sleeved on the telescopic part, and two ends thereof are fixedly connected to the spherical outer shell and the housing respectively.

[0018] Preferably, the control unit comprises a pressure pump and a pipeline;

[0019] The pressure pump is installed on the inner wall of the spherical shell, and one end of the pressure pump is connected to the external gas of the spherical shell, and the other end is connected to the pipeline;

[0020] The end of the pipeline away from the pressure pump is communicated with the telescopic cavity.

[0021] Preferably, the amplitude acquisition unit includes a dancing sensor;

[0022] The dancing sensor is installed on the inner wall of the spherical shell.

[0023] Preferably, a length sensor is installed on the telescopic rod;

[0024] The length sensor is connected to the control unit for signal transmission.

[0025] Based on the same inventive concept, the present invention provides a multi-split conductor anti-dance system based on variable pneumatic effect, including a spacer rod and a multi-split conductor anti-dance device based on variable pneumatic effect;

[0026] A hard connection part is provided on the housing of the anti-dancing device;

[0027] The side of the hard connection portion away from the housing is fixedly connected to the spacer rod.

[0028] Preferably, the hard connection portion includes a connecting plate;

[0029] Two ends of the connecting plate are fixedly connected to the shell and the spacer rod respectively.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention provides a multi-split conductor anti-dancing device based on variable aerodynamic effect, comprising a shell, a telescopic part, an amplitude acquisition unit and a control unit; the shell has an opening, and one end of the telescopic part along its telescopic direction is installed in the shell, and the other end is installed with the amplitude acquisition unit and the control unit; the amplitude acquisition unit and the control unit are connected through signal transmission; the control unit is connected to the telescopic part, and the telescopic part is extended and retracted based on the control unit. The device provided by the present invention obtains the amplitude of the conductor when it dances through the amplitude acquisition unit, and outputs a signal to the control unit, so that the control unit outputs a signal to control the extension and retraction of the telescopic part, and then changes the aerodynamic characteristics of the split conductor by adjusting the length of the telescopic part, thereby realizing the aerodynamic adjustment of the split conductor, reducing the aerodynamic negative damping effect of the conductor under the combined action of eccentric icing and wind, and better adapting to the anti-dancing needs of different lines under complex climatic conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the multi-split wire anti-dancing device based on variable pneumatic effect of the present invention;

[0033] Figure 2 It is a schematic diagram of the telescopic part, the spherical shell and the internal structure thereof when the present invention is in a contracted state;

[0034] Figure 3 It is a schematic diagram of the telescopic part, the spherical shell and the internal structure thereof when the present invention is in an extended state;

[0035] Figure 4 It is a structural schematic diagram of the anti-dancing device of the present invention in a contracted state;

[0036] Figure 5 It is a structural schematic diagram of the anti-dancing device of the present invention in an extended state;

[0037] Figure 6 The pneumatic damping curves of different telescopic lengths according to the present invention vary with the angle of attack;

[0038] Figure 7 It is a working flow chart of the anti-dancing device of the present invention;

[0039] Figure 8 It is a schematic diagram of the overall structure of the multi-split wire anti-dancing system based on variable aerodynamic effect of the present invention.

[0040] Among them, 1. Shell; 2. Telescopic cavity; 3. Telescopic rod; 4. Spherical shell; 5. Compression spring; 6. Telescopic film; 7. Pressure pump; 8. Pipeline; 9. Dancing sensor; 10. Spacer rod; 11. Connecting plate; 12. Power supply. DETAILED DESCRIPTION

[0041] In order to better understand the present invention, the content of the present invention is further described below in conjunction with the accompanying drawings and examples.

[0042] The present invention provides a multi-split conductor anti-dancing device based on variable aerodynamic effect, comprising a shell, a telescopic part, an amplitude acquisition unit and a control unit; the shell has an opening, and one end of the telescopic part along its telescopic direction is installed in the shell, and the other end is installed with the amplitude acquisition unit and the control unit; the amplitude acquisition unit and the control unit are connected through signal transmission; the control unit is connected to the telescopic part, and the telescopic part is extended and retracted based on the control unit. The device provided by the present invention obtains the amplitude of the conductor when it dances through the amplitude acquisition unit, and outputs a signal to the control unit, so that the control unit outputs a signal to control the extension and retraction of the telescopic part, and then changes the aerodynamic characteristics of the split conductor by adjusting the length of the telescopic part, thereby realizing the aerodynamic adjustment of the split conductor, reducing the aerodynamic negative damping effect of the conductor under the combined action of eccentric icing and wind, and better adapting to the anti-dancing needs of different lines under complex climatic conditions.

[0043] Embodiment 1:

[0044] The present invention provides a multi-split wire anti-dancing device based on variable pneumatic effect, such as Figure 1 As shown, it includes a shell 1, a telescopic part, an amplitude acquisition unit and a control unit; the shell 1 has an opening, and one end of the telescopic part along its telescopic direction is installed in the shell 1, and the other end is installed with the amplitude acquisition unit and the control unit; the amplitude acquisition unit and the control unit are connected through signal transmission; the control unit is connected to the telescopic part, and the telescopic part is telescoped based on the control unit.

[0045] like Figure 2 and Figure 3 As shown, the telescopic part includes a telescopic rod 3 provided with a telescopic cavity 2; the telescopic cavity 2 runs through the telescopic rod 3; and the end of the telescopic cavity 2 facing the opening of the housing 1 is connected to the control unit. In order to achieve the telescopic extension of the telescopic rod 3 with high efficiency, the telescopic cavity 2 and the control unit form a sealed cavity. In this embodiment, the telescopic cavity 2 is located in the telescopic rod 3, and the cavity for accommodating the rod member of the telescopic rod 3 is a part of the telescopic cavity 2.

[0046] The end of the telescopic part facing the opening of the housing 1 is provided with a spherical housing 4; the amplitude acquisition unit and the control unit are installed in the spherical housing 4; when the telescopic part is in the telescopic state, the spherical housing 4 abuts against the opening of the housing 1. In this embodiment, the housing 1 is a circular cylindrical structure, which forms a capsule shape with the spherical housing 4 to avoid harmful corona, discharge and noise.

[0047] In this embodiment, a compression spring 5 is provided in the housing 1; the compression spring 5 is sleeved on the telescopic part, and its two ends are respectively in contact with the spherical housing 4 and the housing 1. At the same time, a cylindrical telescopic film 6 is provided in the housing 1; the telescopic film 6 is sleeved on the outside of the compression spring 5, and the two are synchronously telescoped, and the two ends of the telescopic film 6 are respectively fixedly connected with the spherical housing 4 and the housing 1. The specific methods of fixed connection include adhesive connection and screw connection.

[0048] The control unit includes a pressure pump 7 and a pipeline 8; the pressure pump 7 is installed on the inner wall of the spherical shell 4, and one end of the pressure pump 7 is connected to the external gas of the spherical shell 4, and the other end is connected to the pipeline 8; the end of the pipeline 8 away from the pressure pump 7 is connected to the telescopic cavity 2. In this embodiment, the pressure pump 7 can not only realize the inflation into the telescopic cavity 2 through the pipeline 8, but also realize the extraction of gas from the telescopic cavity 2 through the pipeline 8, so as to realize the gas pressure regulation in the telescopic cavity 2. The extension and shortening of the telescopic rod 3 are realized by adjusting the gas pressure in the telescopic cavity 2. When the extension is required, the pressure pump 7 is started, and the gas is transported into the telescopic cavity 2 to increase the gas pressure in the telescopic cavity 2. At the same time, under the action of the compression spring 5 and the telescopic film 6, the telescopic rod 3 is extended, thereby driving the spherical shell 4 away from the shell 1; when the shortening or restoration is required, the pressure pump 7 is started, and the gas in the telescopic cavity 2 is discharged, and the gas pressure in the telescopic cavity 2 is reduced, so that the telescopic rod 3 is shortened, thereby driving the spherical shell 4 to move toward the shell 1. In this embodiment, a power source 12 is disposed in the spherical housing 4 and is connected to the amplitude acquisition unit and the pressure pump 7 through a wire.

[0049] In order to obtain the dancing amplitude of the wire, the amplitude acquisition unit includes a dancing sensor 9 for obtaining the vibration amplitude of the wire; the dancing sensor 9 is installed on the inner wall of the spherical shell 4, and an amplitude judgment chip is also arranged inside the spherical shell 4. A comparison program is arranged in the chip. When the amplitude is not less than one meter, the dancing sensor 9 sends a signal to the pressure pump 7 to start the pressure pump 7, thereby extending the telescopic rod 3.

[0050] A length sensor is installed on the telescopic rod 3, and the length sensor is connected to the control unit for signal transmission. In this embodiment, the length sensor is used to measure the length of the telescopic rod 3, so that the anti-dancing device can adapt to the anti-dancing requirements of different ice thicknesses, different wind speeds, and different wires.

[0051] The installation density of the anti-dancing device is determined based on actual construction requirements. In this embodiment, the anti-dancing device is installed in the spacer bar 10, and only one is installed between adjacent spacers 10 to control the dancing of the conductor. Figure 4 and Figure 5 shown.

[0052] The value of the telescopic length of the telescopic rod 3 is calculated as follows:

[0053] According to the calculation method of aerodynamic force and negative damping of ice-covered conductor, the calculation formula of the telescopic length l is:

[0054]

[0055] Where N is the number of wire splits; d ice is the characteristic thickness of eccentric ice, in mm; d is the outer diameter of the conductor, in mm; l max is the maximum retractable length, generally the distance between two adjacent spacer bars, in m; D is the outer diameter of the retractable film, in mm; l span is the gear distance, unit is m; A is the actual dancing amplitude, unit is m; U v is the vertical component of wind speed relative to the line direction, in m / s; U0 is the design wind speed value, in m / s. The relationship between telescopic length and dancing amplitude, wind speed, ice thickness and other parameters under different working conditions is clarified.

[0056] The working principle of this embodiment is as follows: after the dancing sensor senses the dancing process or risk, it will send a risk instruction to the control unit, and then the control unit will send an instruction to the pump unit to compress or increase the internal pressure of the cylindrical rod, thereby realizing the multi-layer telescopic action inside the rod.

[0057] The variable aerodynamic effect is introduced to change the aerodynamic characteristics of the split conductor by adjusting the length of the telescopic film 6, thereby reducing the aerodynamic negative damping effect required for the induction of dancing. It also has the following effects: good versatility, the active working mode of "state monitoring + adaptive adjustment" can better adapt to the needs of dancing prevention and control under different meteorological conditions, eccentric icing or line structures; in terms of appearance and size, the variable structure is all located within the split circle of the split conductor, avoiding the risk of harmful corona, discharge and noise during the operation of the high-voltage line; the interior of the telescopic film 6 adopts the form of compression spring 5 + telescopic rod 3 to achieve reliable support;

[0058] One of the key factors for conductor galloping is the aerodynamic negative damping effect of the conductor after eccentric icing. This embodiment mainly introduces a length-adjustable coating structure to achieve aerodynamic adjustment and variable targets for split conductors, reduce the aerodynamic negative damping effect of the conductor under the combined effects of eccentric icing and wind, and better adapt to the anti-galloping needs of different lines under complex climatic conditions. Figure 6 As shown, the size of the aerodynamic negative damping of the four-split LGJ-400 / 35 conductor itself is obtained by flow field analysis software, and the aerodynamic damping variation curve with the attack angle at different telescopic lengths after installing the device provided in this embodiment.

[0059] The specific implementation method is as follows:

[0060] like Figure 7As shown, after the anti-dancing device is installed on the conductor, if the conductor dances, the dancing sensor 9 obtains the dancing amplitude of the conductor. If the dancing amplitude of the conductor is not less than one meter, the dancing sensor 9 sends a control signal to the pressure pump 7, and the pressure pump 7 starts to transport gas into the telescopic cavity 2, thereby increasing the gas pressure in the telescopic cavity 2. At the same time, under the action of the compression spring 5 and the telescopic film 6, the telescopic rod 3 extends, thereby driving the spherical shell 4 away from the shell 1, thereby changing the aerodynamic characteristics of the split conductor and reducing the aerodynamic negative damping effect required for the induction of dancing; when the dancing amplitude of the conductor is less than one meter and there is no need to continue to reduce the dancing amplitude of the conductor, the dancing sensor 9 sends a control signal to the pressure pump 7, and the pressure pump 7 starts to discharge the gas in the telescopic cavity 2, reduce the gas pressure in the telescopic cavity 2, shorten the telescopic rod 3, thereby driving the spherical shell 4 to move toward the shell 1 until it returns to its original state.

[0061] The device provided in this embodiment adopts the control mode of "monitoring + control + feedback", has intelligent features, and can fully adapt to different anti-dancing needs.

[0062] Embodiment 2:

[0063] Based on the same inventive concept, the present invention provides a multi-split wire anti-dancing system based on variable aerodynamic effect, such as Figure 8 As shown, it includes a spacer bar 10 and a multi-split wire anti-dancing device based on a variable pneumatic effect; a hard connection part is provided on the housing 1 of the anti-dancing device; and the side of the hard connection part away from the housing 1 is fixedly connected to the spacer bar 10. The anti-dancing device is installed on the wire through the spacer bar 10.

[0064] The hard connection part includes a connecting plate 11; both ends of the connecting plate 11 are respectively fixedly connected to the housing 1 and the spacer bar 10. In this embodiment, bolts and nuts are used to connect the connecting plate 11 and the housing 1, and the connecting plate 11 and the spacer bar 10.

[0065] Obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] The above are merely embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application are included in the scope of the claims of the present application.

Claims

1. A multi-split wire anti-dancing device based on variable aerodynamic effect, characterized in that: It comprises a housing (1), a telescopic portion, an amplitude acquisition unit and a control unit; The housing (1) has an opening, and one end of the telescopic portion along its telescopic direction is installed in the housing (1), and the other end is installed with the amplitude acquisition unit and the control unit; The amplitude acquisition unit and the control unit are connected via signal transmission; The control unit is connected to the telescopic portion, and the telescopic portion is telescoped based on the control unit.

2. According to claim 1, a multi-split wire anti-dancing device based on variable pneumatic effect is characterized in that: The telescopic portion comprises a telescopic rod (3) provided with a telescopic cavity (2); The telescopic cavity (2) passes through the telescopic rod (3); The end of the telescopic cavity (2) facing the opening of the housing (1) is connected to the control unit.

3. The multi-split wire anti-dancing device based on variable pneumatic effect according to claim 2 is characterized in that: The telescopic cavity (2) and the control unit form a sealed cavity.

4. The multi-split wire anti-dancing device based on variable pneumatic effect according to claim 3 is characterized in that: A spherical outer shell (4) is provided at the end of the telescopic portion facing the opening of the housing (1); The amplitude acquisition unit and the control unit are installed in the spherical housing (4); When the telescopic portion is in a telescopic state, the spherical outer shell (4) abuts against the opening of the housing (1).

5. The multi-split wire anti-dancing device based on variable pneumatic effect according to claim 4 is characterized in that: A compression spring (5) is arranged in the housing (1); The compression spring (5) is sleeved on the telescopic portion, and two ends thereof are respectively in contact with the spherical outer shell (4) and the housing (1).

6. The multi-split wire anti-dancing device based on variable pneumatic effect according to claim 4 is characterized in that: A cylindrical telescopic film (6) is arranged in the housing (1); The telescopic film (6) is sleeved on the telescopic portion, and two ends thereof are fixedly connected to the spherical outer shell (4) and the housing (1) respectively.

7. The multi-split wire anti-dancing device based on variable pneumatic effect according to claim 4 is characterized in that: The control unit comprises a pressure pump (7) and a pipeline (8); The pressure pump (7) is installed on the inner wall of the spherical housing (4), and one end of the pressure pump is connected to the external gas of the spherical housing (4), and the other end is connected to the pipeline (8); The end of the pipeline (8) away from the pressure pump (7) is in communication with the telescopic cavity (2).

8. The multi-split wire anti-dancing device based on variable pneumatic effect according to claim 4 is characterized in that: The amplitude acquisition unit comprises a dancing sensor (9); The dancing sensor (9) is installed on the inner wall of the spherical housing (4).

9. The multi-split wire anti-dancing device based on variable pneumatic effect according to claim 2 is characterized in that: A length sensor is installed on the telescopic rod (3); The length sensor is connected to the control unit for signal transmission.

10. A multi-split wire anti-dancing system based on variable aerodynamic effect, characterized in that: It comprises a spacer rod (10) and a multi-split conductor anti-dancing device based on a variable aerodynamic effect as claimed in any one of claims 1 to 9; A hard connection part is provided on the housing (1) of the anti-dancing device; The side of the hard connection portion away from the housing (1) is fixedly connected to the spacer rod (10).

11. The multi-split wire anti-dancing system based on variable aerodynamic effect according to claim 10, characterized in that: The hard connection part comprises a connecting plate (11); The two ends of the connecting plate (11) are fixedly connected to the housing (1) and the spacer rod (10) respectively.

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