Experimental device and method for simulating flash explosion characteristic of power transmission line

Abstract

The invention discloses an experimental device and method for simulating the flash explosion characteristic of a power transmission line, and a power frequency voltage line which is used for simulating an overhead line erected in a power grid. An insulating table is arranged on the conveying equipment, and a loading object is arranged on the insulating table; the acquisition unit is used for acquiring voltage and current waveforms of a power frequency voltage line; wherein the conveying equipment drives the loaded object to approach the power frequency voltage line through the insulation table, and records voltage and current waveforms in the flash explosion process of the power frequency voltage line. Through specific scene instantiation and arrangement of the experimental device for the flash explosion scene, various flash explosion scenes can be simulated, the diversity of collected data is increased, and the test efficiency is improved. Experimental data closer to a real scene are provided for a flash explosion experiment, the reliability of the data is improved, and a foundation is laid for follow-up research by recording voltage and current waveforms in the flash explosion process and analyzing various voltage line damage conditions caused by external force damage factors.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission line simulation experiments, and in particular to a device and method for simulating transmission line flashover characteristics experiments. Background Art

[0002] With the rapid development of economy and society, the growth of electricity demand has led to a continuous increase in power generation and electricity consumption. The safe operation of the power system is crucial to the national economy and people's lives. As a key link in power transmission, high-voltage transmission lines face various challenges. For example, flashover tripping caused by external force damage will have a certain safety impact on transmission lines.

[0003] Flashover tripping is mainly caused by instantaneous breakdown of the surface of the insulation layer of the transmission line due to damage caused by external force, and also includes the glow discharge phenomenon formed by the extremely high electric field intensity around the live high-voltage wires and air ionization.

[0004] There are two main types of external force damage: the first is caused by human factors, such as motor vehicle collisions, foreign objects falling on wires, municipal construction, and theft of power facilities by lawbreakers; the second is caused by sudden changes in the natural environment, such as lightning strikes, tree obstacles, geological disasters, and bird damage;

[0005] The impact of flashover tripping caused by external force damage to transmission lines is far-reaching on the power system. First, it may cause local or large-scale power outages, affecting residents' lives and industrial production, and causing economic losses. In addition, because emergency repairs need to be carried out quickly, this not only increases the operating costs of power companies, but may also cause long-term power supply interruptions due to the complexity of the repair work. Therefore, it is necessary to analyze and judge line flashovers. Summary of the invention

[0006] In view of the problems existing in the above-mentioned existing experimental devices and methods for simulating flashover characteristics of power transmission lines, the present invention is proposed.

[0007] Therefore, the object of the present invention is to provide an experimental device and method for simulating the flashover characteristics of a transmission line.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] An experimental device for simulating flashover characteristics of power transmission lines, comprising:

[0010] Power frequency voltage line, used to simulate the overhead line erected in the power grid;

[0011] A conveying device, on which an insulating platform is provided, and a load is provided on the insulating platform;

[0012] A collection unit, used for collecting voltage and current waveforms of the power frequency voltage line;

[0013] The conveying equipment drives the load close to the power frequency voltage line through the insulating platform, and records the voltage and current waveforms of the power frequency voltage line during the flashover process.

[0014] As a preferred solution of the experimental device for simulating flashover characteristics of power transmission lines of the present invention, the insulating platform is fixedly arranged on the conveying equipment.

[0015] As a preferred solution of the experimental device for simulating flashover characteristics of power transmission lines of the present invention, the load is a dumping mechanism, which includes a long rod arranged on the insulating platform, a vibrator installed on one side of the long rod, a lifting part fixed on the top of the insulating platform, and a blower installed on the top of the lifting part;

[0016] The lifting part can drive the blower to move up and down, and the air outlet of the blower is opposite to the long rod.

[0017] As a preferred solution of the experimental device for simulating flashover characteristics of power transmission lines of the present invention, the dumping mechanism further includes a soil box, and the long rod is connected to the soil box via a metal braided belt.

[0018] As a preferred solution of the experimental device for simulating flashover characteristics of power transmission lines of the present invention, a clamp is provided on the insulating platform, and a long rod is fixed on the insulating platform by the clamp.

[0019] As a preferred solution of the experimental device for simulating flashover characteristics of power transmission lines of the present invention, the load is a collision mechanism, which includes a contact piece arranged on the insulating platform.

[0020] As a preferred solution of the experimental device for simulating flashover characteristics of power transmission lines of the present invention, a blocking part is provided below the power frequency voltage line;

[0021] Wherein, the conveying device drives the contact piece to approach the blocking part.

[0022] As a preferred solution of the experimental device for simulating flashover characteristics of power transmission lines of the present invention, the load is a placement mechanism, which includes a lifting platform arranged on the insulating platform, a hydraulic telescopic rod installed on the top of the lifting platform, and a moving part is arranged at the end of the hydraulic telescopic rod;

[0023] Wherein, the hydraulic telescopic rod can drive the moving part to approach the power frequency voltage line.

[0024] As a preferred solution of the experimental device for simulating flashover characteristics of power transmission lines of the present invention, a mechanical gripper is installed at the end of the hydraulic telescopic rod, and the mechanical gripper can grasp the moving part.

[0025] A method for simulating the flashover characteristics of a power transmission line comprises the above-mentioned experimental device for simulating the flashover characteristics of a power transmission line, and,

[0026] Determine the flash explosion type according to the experimental needs and place different loads on the conveying equipment;

[0027] After the load is set, the remote control conveying equipment drives the load close to the power frequency voltage line;

[0028] The acquisition unit acquires the voltage and current waveforms of the power frequency voltage line during this process;

[0029] Conduct multiple experiments on collecting, configuring environmental parameters, and controlling conveying equipment based on the collected information;

[0030] By changing different environmental parameters and collecting data in batches, multi-indicator sensitivity analysis can be achieved.

[0031] The beneficial effects of the present invention include: specific scenario instantiation, setting up experimental equipment for flashover scenarios, being able to simulate a variety of flashover scenarios, increasing the diversity of collected data, providing experimental data that is closer to real scenarios for flashover experiments, and improving data reliability. By recording the voltage and current waveforms during the flashover process, and analyzing a variety of voltage line damage caused by external force destructive factors, the foundation is laid for subsequent research to reduce the impact of flashover tripping caused by external force damage to transmission lines on the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0033] Figure 1 It is a structural schematic diagram of the dumping mechanism in the present invention.

[0034] Figure 2 It is a structural schematic diagram of the collision mechanism in the present invention.

[0035] Figure 3 It is a structural schematic diagram of the placement mechanism in the present invention. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0040] Example 1

[0041] Reference Figure 1-3 , provides an experimental device for simulating the flashover characteristics of transmission lines, including:

[0042] The power frequency voltage line 100 is used to simulate the overhead line erected in the power grid;

[0043] A conveying device 200 is provided with an insulating platform 300, and a load is provided on the insulating platform 300;

[0044] A collection unit, used for collecting voltage and current waveforms of the power frequency voltage line 100;

[0045] The conveying device 200 drives the load to approach the power frequency voltage line 100 through the insulating platform 300, and records the voltage and current waveforms of the power frequency voltage line 100 during the flash explosion process;

[0046] The insulating platform 300 is fixed on the conveying device 200;

[0047] In this embodiment, the conveying device 200 is a mobile trolley, the body of which is composed of a front and a cargo box. The entire device is connected to the flash explosion experimental platform for control, and is also equipped with a manual remote control, so that the movement of the trolley can be remotely controlled. The load on the conveying device 200 can be replaced as needed;

[0048] The load is placed on the insulating platform 300, so that when the load falls and contacts the power frequency high-voltage line, the load is insulated from the vehicle body, thus avoiding the influence of the high-voltage test on the conveying equipment 200 to a certain extent;

[0049] The power frequency high voltage generator provides high voltage power for the transmission line flash explosion test device. At the same time, an environmental simulator is also set up. The environmental simulator consists of a fan system, a spray atomizer and a noise generator. The fan system simulates windy environment; the spray atomizer realizes two characteristics of spraying and atomization, simulating rain and fog respectively; the noise generator simulates environmental background noise;

[0050] The acquisition unit consists of an infrared thermal imager, a high-speed camera and an audio collector, which are used to collect infrared video, visible light video and audio signals of the flash arc respectively.

[0051] A method for simulating the flashover characteristics of a power transmission line comprises the above-mentioned experimental device for simulating the flashover characteristics of a power transmission line, and,

[0052] According to the experimental requirements, the flash explosion type is determined and different loads are placed on the conveying device 200;

[0053] After the load is set, the remote control conveying device 200 drives the load close to the power frequency voltage line 100;

[0054] The acquisition unit acquires voltage and current waveforms of the power frequency voltage line 100 during this process;

[0055] According to the collected information, the environmental parameters are configured and the conveying equipment 200 is controlled to conduct multiple experiments;

[0056] By changing different environmental parameters and collecting data in batches, multi-indicator sensitivity analysis can be achieved.

[0057] Specific scenarios are instantiated, and experimental devices are set up for flash explosion scenarios. This can simulate a variety of flash explosion scenarios, increase the diversity of collected data, provide experimental data closer to real scenarios for flash explosion experiments, and improve data reliability. By recording the voltage and current waveforms during the flash explosion process, the damage to the voltage line caused by various external force damage factors is analyzed, laying the foundation for subsequent research to reduce the impact of flash explosion tripping caused by external force damage on the power system.

[0058] Example 2

[0059] Reference Figure 1 , this embodiment is different from the first embodiment in that: the load is a dumping mechanism 400, which includes a long rod 401 arranged on the insulating platform 300, a vibrator 402 installed on one side of the long rod 401, a lifting part 403 fixed on the top of the insulating platform 300, and a blower 404 installed on the top of the lifting part 403;

[0060] The lifting part 403 can drive the blower 404 to move up and down, and the air outlet of the blower 404 is opposite to the long rod 401;

[0061] The dumping mechanism 400 further includes a soil box 405, and the long rod 401 is connected to the soil box 405 via a metal braided belt;

[0062] A clamp 406 is provided on the insulating platform 300, and a long rod 401 is fixed to the insulating platform 300 through the clamp 406;

[0063] The vibrator 402 is installed on the lifting part 403. The lifting part 403 is provided with a controller, which can remotely control the lifting part 403 to rise or fall. In this embodiment, the long rod 401 is a solid wooden rod, which is fixed by a clamp 406, and then the long rod 401 is used to simulate a big tree in a real scene; four mechanical arms are installed on both sides of the remote control car body for fixing on the ground to increase the stability of the experimental platform;

[0064] The soil box 405 is a square device placed on one side of the conveying device 200. Its structure is that there is a good grounding grid inside. In this embodiment, the metal braided belt is a copper braided belt, which is introduced into the soil box 405 and connected to the earth through the soil in the soil box 405 and the grounding resistance network. There is soil between the copper braided belt and the grounding grid. The soil is used to simulate different soil properties in the actual flash explosion process.

[0065] The corresponding grounding resistance can be adjusted according to the soil weight and temperature and humidity in the soil box 405, increasing the data comparison under different experimental conditions. At the same time, the soil box 405 is connected to the tree through a copper wire braid, which restores the actual situation of the tree bordering the earth to a certain extent.

[0066] The vibrator 402 can vibrate the long rod 401 through the insulating platform 300, and the vibrator 402 is brought close to the long rod 401 to simulate the shaking of the roots of the tree, which is more in line with the actual scene that the tree may be uprooted in the case of howling strong winds;

[0067] The distance between the long pole 401 and the power frequency voltage line 100 is controlled by remote control of the conveying device 200 to ensure that the long pole 401 can contact the power frequency voltage line 100 after dumping, and the mechanical arm is lowered to ensure the stability of the conveying device 200. After parking, the mechanical arm should be extended and fixed on the ground so that the trolley will not deviate during the vibration process. When the conveying device 200 moves to the required position, the vibrator 402 and the blower 404 are turned on to help the long pole 401 to break away from the clamp 406 and touch the power frequency high voltage line, thereby causing the flash explosion process. It should be noted that the blower The fan 404 is used to simulate a windy scene. When the fan 404 moves up and down with the lifting part 403, the contact surface of the wind blowing on the tree also changes accordingly, simulating the characteristic of the uncertainty of the wind blowing angle in actual situations. In addition, since the vibrator 402 and the long rod 401 are placed on the same insulating platform 300, the vibrator 402 can promote the shaking of the long rod 401; the long rod 401 is connected to the soil box 405 placed next to the trolley through a metal braided belt, simulating the connection between the tree and the earth, and by changing the temperature and humidity in the soil box 405, different grounding resistance conditions required for the experiment can be set;

[0068] The above experimental operation is used to simulate the flash explosion of the line when the tree collapses.

[0069] The rest of the structure is the same as that of Example 1.

[0070] Example 3

[0071] Reference Figure 2 This embodiment is different from the above embodiments in that the load is a collision mechanism 500 , which includes a contact member 501 disposed on an insulating platform 300 .

[0072] A blocking portion 502 is provided below the power frequency voltage line 100;

[0073] The conveying device 200 drives the contact member 501 to approach the blocking portion 502 .

[0074] In this embodiment, the contact 501 is actually a painted metal component, which is used to simulate the metal shell of the vehicle body during a collision. The contact 501 is placed on the insulating platform 300 so that the contact 501 can fall due to inertia, with the basic power frequency voltage circuit 100;

[0075] The blocking part 502 is a block-shaped object, which is made of carbon fiber composite material, and is suitable for flash explosion experiments caused by motor vehicle collision. Carbon fiber composite material has the characteristics of high strength and high stiffness. During the collision, the carbon fiber composite material takes away a large amount of energy through a series of processes such as matrix damage and fiber breakage. Under the condition of the same degree of deformation or even fracture damage, the energy absorption efficiency is higher than that of other material parts.

[0076] The blocking portion 502 should be placed below the power frequency voltage line 100 to ensure that after the trolley hits the blocking block, the contact member 501 on the trolley can come into contact with the power frequency voltage line 100 when it falls forward due to inertia;

[0077] The conveying device 200 is remotely controlled to move toward the blocking portion 502. After the conveying device 200 approaches the blocking portion 502, the movement of the conveying device 200 is instantly stopped, so that the contact piece 501 contacts the industrial frequency high-voltage line due to the penetration and tipping. This process simulates the contact between the voltage line and the metal shell of the vehicle body after the motor vehicle hits the pole tower in actual situations.

[0078] The rest of the structure is the same as that of Example 1.

[0079] Example 4

[0080] Reference Figure 3 , this embodiment is different from the above embodiments in that: the load is a placement mechanism 600, which includes a lifting platform 601 arranged on the insulating platform 300, a hydraulic telescopic rod 602 installed on the top of the lifting platform 601, and a moving part 603 is provided at the end of the hydraulic telescopic rod 602;

[0081] The hydraulic telescopic rod 602 can drive the moving part 603 to approach the power frequency voltage line 100;

[0082] A mechanical gripper 604 is installed at the end of the hydraulic telescopic rod 602, and the mechanical gripper 604 can grasp the moving part 603;

[0083] The mechanical gripper 604 grasps the moving part 603, so that the hydraulic telescopic rod 602 can drive the moving part 603 to move to the desired position; the hydraulic telescopic rod 602 can move the moving part 603 in the horizontal direction;

[0084] First, operate the button of the lifting platform 601 to raise the wooden stick on the mechanical gripper 604 to a height above the power frequency voltage line, then remotely control the conveying equipment 200 to move forward, ensure that after the conveying equipment 200 stops, the moving part 603 on the mechanical gripper 604 is placed above the power frequency voltage line 100, and finally press the gripper switch to release the moving part 603 and make it fall onto the power frequency voltage line. Although the free fall process of the moving part 603 in the experiment is inconsistent with the direction of foreign matter floating in reality, the final result is that the voltage line is short-circuited and thus causes a flash explosion fault, so the simulation experiment can be implemented; the above operations are used to simulate the line flash explosion caused by the intrusion of foreign matter.

[0085] The rest of the structure is the same as that of Example 3.

[0086] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0087] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0088] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0089] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An experimental device for simulating flashover characteristics of power transmission lines, characterized in that: include, A power frequency voltage line (100) is used to simulate an overhead line erected in a power grid; A conveying device (200) is provided with an insulating platform (300) on which a load is provided; A collection unit, used for collecting voltage and current waveforms of an industrial frequency voltage line (100); The conveying device (200) drives the load to approach the power frequency voltage line (100) via the insulating platform (300), and records the voltage and current waveforms of the power frequency voltage line (100) during the flashover process.

2. The experimental device for simulating flashover characteristics of power transmission lines according to claim 1, characterized in that: The insulating platform (300) is fixedly mounted on the conveying equipment (200).

3. The experimental device for simulating flashover characteristics of power transmission lines according to claim 2, characterized in that: The load is a dumping mechanism (400), which includes a long rod (401) arranged on the insulating platform (300), a vibrator (402) installed on one side of the long rod (401), a lifting part (403) fixed on the top of the insulating platform (300), and a blower (404) installed on the top of the lifting part (403); The lifting part (403) can drive the blower (404) to move up and down, and the air outlet of the blower (404) is opposite to the long rod (401).

4. The experimental device for simulating flashover characteristics of power transmission lines according to claim 3, characterized in that: The dumping mechanism (400) further comprises a soil box (405), and the long rod (401) is connected to the soil box (405) via a metal braided belt.

5. The experimental device for simulating flashover characteristics of power transmission lines according to claim 4, characterized in that: A clamp (406) is provided on the insulating platform (300), and a long rod (401) is fixedly provided on the insulating platform (300) via the clamp (406).

6. The experimental device for simulating flashover characteristics of power transmission lines according to claim 2, characterized in that: The load is a collision mechanism (500), which comprises a contact piece (501) arranged on the insulating platform (300).

7. The experimental device for simulating flashover characteristics of power transmission lines according to claim 6, characterized in that: A blocking portion (502) is provided below the power frequency voltage circuit (100); Wherein, the conveying device (200) drives the contact member (501) to approach the blocking portion (502).

8. The experimental device for simulating flashover characteristics of power transmission lines according to claim 2, characterized in that: The load is a placement mechanism (600), which comprises a lifting platform (601) arranged on the insulating platform (300), a hydraulic telescopic rod (602) installed on the top of the lifting platform (601), and a moving part (603) is provided at the end of the hydraulic telescopic rod (602); The hydraulic telescopic rod (602) is capable of driving the moving part (603) to approach the industrial frequency voltage line (100).

9. The experimental device for simulating flashover characteristics of power transmission lines according to claim 8, characterized in that: A mechanical gripper (604) is installed at the end of the hydraulic telescopic rod (602), and the mechanical gripper (604) is capable of grasping the moving part (603).

10. An experimental method for simulating flashover characteristics of power transmission lines, characterized in that: The invention comprises the experimental device for simulating flashover characteristics of power transmission lines as described in any one of claims 1, 5, 7 and 9, and According to experimental requirements, the flash explosion type is determined, and different loads are placed on the conveying device (200); After the load is set, the remote control conveying device (200) drives the load close to the power frequency voltage line (100); The collecting unit collects voltage and current waveforms of the power frequency voltage line (100) during this process; Perform multiple experiments on the collected information, configure environmental parameters, and control the conveying equipment (200); By changing different environmental parameters and collecting data in batches, multi-indicator sensitivity analysis can be achieved.

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