Overvoltage protection device for overhead transmission line construction and use method

Abstract

The invention relates to the technical field of electrical equipment, in particular to an overvoltage protection device for overhead transmission line construction and a use method, the overvoltage protection device comprises an isolation box and a gas storage box, inert gas is stored in the isolation box and the gas storage box, and the inert gas circularly flows between the isolation box and the gas storage box; two electrode bodies are oppositely arranged in the isolation box, one electrode body is connected with a power transmission line, and the other electrode body is connected with the ground through a grounding unit; the inert gas circularly flows between the isolation box and the gas storage box, and fresh inert gas can be continuously provided for ionization and breakdown, so that under the condition that normal ionization and electric conduction of the inert gas are guaranteed, electric energy is absorbed by utilizing the characteristic that the inert gas absorbs energy during ionization, the energy absorption capacity is remarkably improved, and the service life of the device is prolonged. And the overvoltage protection effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to an overvoltage protection device for overhead power transmission line construction and a use method thereof. Background Art

[0002] As global electricity demand continues to grow, the demand for efficient and reliable power transmission is also increasing. Especially in the process of large-scale infrastructure construction and urbanization, the expansion and upgrading of power transmission networks have become an important part of ensuring economic development. However, in this process, the construction and maintenance of overhead transmission lines face many challenges, one of which is how to effectively prevent the potential threat of overvoltage to equipment and personnel.

[0003] Overvoltage refers to the phenomenon that the voltage in the power system exceeds its rated value. It can be caused by lightning strikes, operating errors, failures or other factors. For overhead transmission lines under construction, overvoltage may not only cause damage to newly installed equipment, but also endanger the safety of on-site workers. In addition, overvoltage events may also cause power supply interruptions and affect the stability and reliability of the power grid.

[0004] Existing overvoltage protection devices, such as spark gap protectors, mainly rely on breaking down the inert gas between the two electrodes to make the device resistance lower than that of a normal circuit and conduct electricity, thereby transferring the excess electrical energy of the overvoltage to the ground, thereby achieving the purpose of protecting transmission lines and equipment. However, a protection device of this structure only utilizes the ionization conductive effect of the inert gas. When the inert gas is ionized, it will absorb part of the electrical energy. Since there is relatively little inert gas between the two plates, this energy-absorbing protection method cannot be used in this type of device. Therefore, its protection method is single and its functionality is poor. Summary of the invention

[0005] In view of the above technical problems, the present invention provides an overvoltage protection device for overhead power transmission line construction and a method of use, the specific technical solution adopted is: According to a first aspect of the present invention, there is provided an overvoltage protection device for overhead power transmission line construction, comprising an isolation box and a gas storage box, wherein both the isolation box and the gas storage box store inert gas, and the inert gas circulates between the isolation box and the gas storage box; Two electrode bodies are arranged opposite to each other in the isolation box, one of the electrode bodies is connected to the power transmission line, and the other electrode body is connected to the ground through a grounding unit.

[0006] In some embodiments of the present invention, the inert gas includes at least one of neon, argon, and xenon.

[0007] In some embodiments of the present invention, a plurality of heat sinks are arranged on the air storage box.

[0008] In some embodiments of the present invention, the end surface of each electrode body is configured as a conical surface, and the conical surfaces on the two electrode bodies are opposite to each other.

[0009] In some embodiments of the present invention, the distance between the two electrode bodies can be adjusted.

[0010] In some embodiments of the present invention, the grounding unit includes a main line and a plurality of branch lines connected to the main line, the plurality of branch lines are dispersedly inserted into the ground, and the main line is electrically connected to one of the electrode bodies.

[0011] In some embodiments of the present invention, the overvoltage protection device further includes a coil sleeved on a portion of the transmission line, and the coil is connected to the ground through the grounding unit.

[0012] In some embodiments of the present invention, the overvoltage protection device further comprises a resistance adjusting unit, and the resistance adjusting unit provides a high resistance for the power transmission line when the power transmission line is overvoltage.

[0013] In some embodiments of the present invention, the resistance adjustment unit includes an electric push rod, a low-resistance contact, a high-resistance contact and a gate plate, the gate plate is electrically connected to one of the low-resistance contact and the high-resistance contact and is installed in series in a power transmission line, the electric push rod adjusts the position of the gate plate between the low-resistance contact and the high-resistance contact, and the coil provides electrical energy to the electric push rod.

[0014] In a second aspect, a method for using an overvoltage protection device for overhead power transmission line construction of the present invention comprises the following steps: Assemble the equipment and connect it to the transmission line; Adjusting the distance between the two electrode bodies and fixing them on the isolation box; allowing an inert gas to flow between the isolation box and the gas storage box; When the power transmission line is operating normally, the two electrode bodies are in a disconnected state, and no induced current is generated in the coil; When an overvoltage occurs in the transmission line, an electric field is generated between the two electrode bodies and the inert gas is ionized, and the electric energy is introduced into the ground through the two electrode bodies and the grounding unit, and the coil will generate an inductance effect due to the change of the magnetic field around the transmission line, and the coil will hinder the current in the transmission line, and the induced current generated in the coil will be transmitted to the ground through the resistance adjustment unit and the grounding unit, and the resistance adjustment unit will simultaneously connect a high resistance to the transmission line; The inert gas flows and absorbs electrical energy.

[0015] The beneficial effects of the present invention are: By circulating the inert gas between the isolation box and the gas storage box, fresh inert gas can be continuously provided for ionization and breakdown, so that while ensuring the normal ionization and conductivity of the inert gas, the energy absorption characteristic of the inert gas during ionization is utilized to absorb electrical energy, thereby significantly improving the energy absorption capacity and the overvoltage protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a schematic diagram of a cross-sectional structure of an isolation box in an embodiment of the present invention; Figure 3 is a schematic structural diagram of a coil in an embodiment of the present invention; Figure 4 Schematic diagram of the structure of the resistance adjustment unit in the embodiment of the present invention.

[0018] Reference numerals: 100, isolation box; 101, electrode body; 102, gas storage box; 103, insulation sleeve; 104, conductive column; 105, main line; 106, branch line; 107, movable plate; 108, push-pull rod; 109, motor; 110, turntable; 200, coil; 300, resistance adjustment unit; 301, electric push rod; 302, low resistance contact; 303, high resistance contact; 304, gate piece. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] like Figures 1 to 4As shown, an overvoltage protection device for overhead power transmission line construction of the present invention comprises an isolation box 100 and a gas storage box 102, both of which store inert gas, and the inert gas flows between the isolation box 100 and the gas storage box 102; in the present invention, the isolation box 100 mainly provides space for ionization and breakdown of the inert gas, the gas storage box 102 is mainly used to store and exchange the inert gas, the isolation box 100 and the gas storage box 102 are connected by two delivery pipes, and in order to realize the flow of the inert gas, a delivery pump can be installed on the gas storage box 102, thereby providing power for the flow of the inert gas between the isolation box 100 and the gas storage box 102; of course, when the inert gas is ionized, it will move along the direction of the electric field, thereby assisting in driving the flow of the inert gas in the isolation box 100; Two electrode bodies 101 are arranged opposite to each other in the isolation box 100, one electrode body 101 is connected to the transmission line, and the other electrode body 101 is connected to the ground through the grounding unit; in this way, a channel can be formed between the transmission line and the ground through the two electrode bodies 101, and when there is no discharge between the two electrode bodies 101, the channel is in a disconnected state, and the current in the transmission line will not be transmitted to the ground; when the transmission line generates an overvoltage, the voltage between the transmission line and the ground is large, that is, the voltage between the two electrode bodies 101 is large, and at this time a large electric field will be generated between the two electrode bodies 101, and the electric field acts on the inert gas, thereby ionizing and breaking down the inert gas, causing the current to flow between the two electrode bodies 101, thereby transmitting the electric energy to the ground, thereby realizing the protection of the equipment in the transmission line; In the present invention, when the electric field strength exceeds the breakdown threshold of the inert gas, the gas molecules are ionized to form free electrons and positive ions. Under the action of the electric field, the free electrons move toward the electrode body 101 as the positive electrode and are absorbed by it, and the positive ions move toward the electrode body 101 as the negative electrode and recombine with the electrons on the surface to form neutral atoms. The neutral atoms formed after the recombination will be released from the surface of the electrode body 101 and re-enter the gas. In this way, the gas that absorbs electrical energy will enter the gas storage box 102 from the isolation box 100, and the unionized gas in the gas storage box 102 will be replenished into the isolation box 100. In this way, the continuous ionization of the inert gas is utilized to make the inert gas continuously absorb electrical energy, so as to protect the transmission line during overvoltage by utilizing the energy absorption characteristic of the ionization of the inert gas. Since the inert gas between the two electrode bodies 101 is ionized when overvoltage occurs, its resistance is smaller than the resistance of the electrical equipment installed in the transmission line. At this time, the electric energy is directly conducted to the ground, and the voltage applied to the electrical equipment in the transmission line is relatively small, thereby achieving a protective effect; By circulating the inert gas between the isolation box 100 and the gas storage box 102, fresh inert gas can be continuously provided for ionization and breakdown, so that while ensuring the normal ionization and conductivity of the inert gas, the energy absorption characteristic of the inert gas during ionization is utilized to absorb electrical energy, thereby significantly improving the energy absorption capacity and the overvoltage protection effect.

[0021] Further, the inert gas includes at least one of neon, argon, and xenon; The gases listed above have low ionization phases, stable chemical properties, are not easy to react with other substances, have strong energy absorption capacity, wide applicability, good environmental protection, high economy, and strong protection effect. These advantages make the overvoltage protection device have broad application prospects and significant protection effects in the construction of overhead transmission lines; moreover, as a preferred embodiment, the above-mentioned gases can be used alone or in a mixed manner. When mixed, they can achieve a coverage effect for various voltage occasions.

[0022] Optimizing the above implementation, a plurality of heat sinks are arranged on the air storage box 102; In the process of positive ions returning to neutral atoms, a large amount of energy is released, which will increase the temperature around the electrode body 101 as the negative electrode. At this time, due to the circulation of the inert gas, the gas can carry the heat into the gas storage box 102. The high-temperature inert gas will conduct the heat through the gas storage box 102 and the heat sink thereon, thereby achieving the heat dissipation function. Since the heat evaporates on the gas storage box 102, it is possible to avoid heat concentration in the isolation box 100 and damage to the structure in the isolation box 100, thereby realizing a separate heat dissipation method; this method of energy absorption, transfer, and release realizes the safe transmission and dissipation of energy, and realizes a sponge-like energy storage method of inert gas, which is convenient for buffering the energy during overvoltage.

[0023] In order to concentrate the electric field between the two electrode bodies 101 and make it easier to achieve ionization and breakdown effects in the isolation box 100, the following method can be used: Figure 2 In the manner shown, the end face of each electrode body 101 is set as a cone, and the cones on the two electrode bodies 101 are opposite to each other; by using the cone, the electric field can be easily concentrated between the tip positions of the two cones, thereby enhancing the electric field strength and facilitating easier breakdown of the inert gas. This structural design can improve the sensitivity of the device; and in the present invention, as a preferred implementation, the electrode body 101 can adopt a cone shape such as a cone or a pyramid, or an elliptical, parabolic, curved or other arbitrary shape with a gathering effect at the tip. As long as it can achieve the effect of gathering the electric field, it is within the protection scope of this case.

[0024] Since the electric field strength between the two electrode bodies 101 is also related to the distance between the two electrode bodies 101, in order to facilitate the device to be applicable to different overvoltage conditions, the distance between the two electrode bodies 101 can be adjusted, so that by adjusting the distance between the two electrode bodies 101, the electric field threshold when the inert gas between the two electrode bodies 101 is broken down can be adjusted; In actual use, the moving direction of the electrode body 101 can be along the direction of the vertical line between the two electrode bodies 101. The electrode body 101 can be installed on the isolation box 100 through the insulating sleeve 103 and the conductive column 104 arranged thereon. Figure 2 As shown, the insulating sleeve 103 passes through one end of the isolation box 100 and is fixedly connected, the conductive column 104 slides through the insulating sleeve 103 and extends into the isolation box 100, the conductive column 104 is fixedly connected to the electrode body 101, and the current can be transmitted to the electrode body 101 through the conductive column 104, that is, the conductive column 104 can be electrically connected to the transmission line or the grounding unit; Optimized in the above implementation, the movement of the electrode body 101 can be achieved by moving the conductive column 104, and the movement of the conductive column 104 can be achieved by manual or mechanical structure. Specifically, an insulating movable plate 107 is provided on each conductive column 104, and the movable plate 107 is slidably installed on the outer wall of the isolation box 100 along the axial direction of the isolation box 100, and a push-pull rod 108 is tilted and rotatably provided on each movable plate 107, and a motor 109 is provided between the two movable plates 107, and a turntable 110 is provided at the output end of the motor 109, and the push-pull rod 108 is eccentrically connected to the turntable 110, so that when the motor 109 drives the turntable 110 to rotate, it will drive the two movable plates 107 to move closer to or away from each other through the two push-pull rods 108, thereby realizing the adjustment of the positions of the two conductive columns 104 and the two electrode bodies 101; of course, a cylinder or other structure can also be used to achieve the above purpose; In actual use, for the convenience of installation, a chassis can be provided, and the structure of this case can be installed in the chassis.

[0025] like Figure 2 As shown, the above implementation is optimized, and the grounding unit includes a main line 105 and a plurality of branch lines 106 connected to the main line 105, and the plurality of branch lines 106 are dispersedly inserted into the ground, and the main line 105 is electrically connected to an electrode body 101; in this way, the current during overvoltage can be transmitted to the ground through the main line 105 and the plurality of branch lines 106, and the dispersed setting of the plurality of branch lines 106 can disperse the current and reduce the potential of the single-point grounding position; the method of inserting the branch lines 106 into the ground can reduce the increase of the ground potential, thereby facilitating the protection of personnel and equipment on the ground.

[0026] As a preferred embodiment of the above-mentioned implementation, Figure 2As shown, the overvoltage protection device also includes a coil 200 sleeved on a part of the transmission line, and the coil 200 is connected to the ground through a grounding unit; the coil 200 is also installed in the chassis, and the transmission line passes through the coil 200 for transmission. When an overvoltage is generated, the magnetic field around the transmission line changes. At this time, the coil 200 in the magnetic field will hinder the change of the current in the line due to the inductance effect, thereby achieving a single-pole protection effect, and this method can also achieve a filtering effect; because the coil 200 is grounded, the induced current generated in the coil 200 will be directly transmitted to the underground, thereby using the coil 200 to transfer part of the electric energy, thereby achieving a secondary protection effect, thus realizing a multi-channel protection method; Based on the above implementation, the setting of the coil 200 also realizes a non-contact discharge protection method, and its structure is simple, the response speed is fast, and it is easy to install; of course, for further optimization, the coil 200 can be made of metal oxide varistor material, that is, when the line voltage is normal, the coil 200 is in a high resistance state, and when the overvoltage occurs, the impedance of the coil 200 drops sharply and forms a low resistance path, thereby realizing the rapid extraction and release of electric energy and achieving an efficient protection effect.

[0027] Furthermore, if Figure 3 As shown, the number of coils 200 is set to be several, and the several coils 200 are arranged in sequence from the inside to the outside, and the several coils 200 are connected in series in sequence; in this way, the area where the magnetic field is located can be filled in a larger range, and the number of turns is increased by 20, thereby improving the inductance effect; this arrangement method can minimize the space occupied by the structure.

[0028] To further improve the protection effect, Figure 4 As shown, the overvoltage protection device also includes a resistance adjusting unit 300, which provides a high resistance for the transmission line when the transmission line is overvoltage; when the transmission line is overvoltage, the resistance adjusting unit 300 can connect the high resistance to the transmission line, thereby increasing the difference between the resistance in the transmission line and the resistance when the inert gas in the isolation box 100 is broken down, thereby further reducing the current flowing in the transmission line, increasing the amount of electric energy released, and thus improving the protection effect.

[0029] In the present invention, the above implementation is optimized, such as Figure 4 As shown, the resistance adjustment unit 300 includes an electric push rod 301, a low resistance contact 302, a high resistance contact 303 and a gate 304. The gate 304 is electrically connected to one of the low resistance contact 302 and the high resistance contact 303 and is installed in series in the power transmission line. The electric push rod 301 adjusts the position of the gate 304 between the low resistance contact 302 and the high resistance contact 303. The coil 200 provides electric energy for the electric push rod 301. In the above content, the low-resistance contact 302 and the high-resistance contact 303 are connected to the circuit as one pole, and the gate 304 is connected to the circuit as the other pole. The gate 304 can be connected to one of the low-resistance contact 302 and the high-resistance contact 303 to make the circuit conductive, and the electric push rod 301 is used to provide power for the movement of the gate 304; when the low-resistance contact 302 is electrically connected to the gate 304, the transmission line is in a normal state; when the high-resistance contact 303 is electrically connected to the gate 304, the transmission line is in an overvoltage state, and the connection of the high-resistance contact 303 can increase the resistance of the transmission line; because an induced current is generated inside the coil 200 when the voltage is over, this part of the electric energy can be used to provide power for the movement of the electric push rod 301, thereby avoiding the cumbersome operation of equipping the electric push rod 301 with a power supply and a controller, and simplifying the structure and operation method; It should be noted that in the natural state, the spring in the electric push rod 301 will keep the low-resistance contact 302 and the gate plate 304 electrically connected. When overvoltage occurs, the electric push rod 301 will be energized and will move the gate plate 304, and the gate plate 304 will be electrically connected to the high-resistance contact 303.

[0030] A method for using an overvoltage protection device for overhead power transmission line construction of the present invention comprises the following steps: Assemble the equipment and connect it to the transmission line; Adjust the distance between the two electrode bodies 101 and fix them on the isolation box 100; Allowing inert gas to flow between the isolation box 100 and the gas storage box 102; When the power transmission line is operating normally, the two electrode bodies 101 are disconnected, and no induced current is generated in the coil 200; When an overvoltage occurs in the transmission line, an electric field is generated between the two electrode bodies 101 and the inert gas is ionized. The electric energy is introduced into the ground through the two electrode bodies 101 and the grounding unit. The coil 200 generates an inductance effect due to the change of the magnetic field around the transmission line. The coil 200 hinders the current in the transmission line. The induced current generated in the coil 200 is transmitted to the ground through the resistance adjustment unit 300 and the grounding unit. The resistance adjustment unit 300 simultaneously connects a high resistance to the transmission line. The inert gas flows and absorbs electrical energy.

[0031] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An overvoltage protection device for overhead power transmission line construction, characterized in that: It comprises an isolation box and a gas storage box, wherein both the isolation box and the gas storage box store inert gas, and the inert gas circulates between the isolation box and the gas storage box; Two electrode bodies are arranged opposite to each other in the isolation box, one of the electrode bodies is connected to the power transmission line, and the other electrode body is connected to the ground through a grounding unit.

2. An overvoltage protection device for overhead power transmission line construction according to claim 1, characterized in that: The inert gas includes at least one of neon, argon and xenon.

3. An overvoltage protection device for overhead power transmission line construction according to claim 1, characterized in that: A plurality of heat sinks are arranged on the air storage box.

4. An overvoltage protection device for overhead power transmission line construction according to claim 1, characterized in that: The end surface of each electrode body is configured as a conical surface, and the conical surfaces on the two electrode bodies are opposite to each other.

5. An overvoltage protection device for overhead power transmission line construction according to claim 4, characterized in that: The distance between the two electrode bodies can be adjusted.

6. An overvoltage protection device for overhead power transmission line construction according to claim 1, characterized in that: The grounding unit includes a main line and a plurality of branch lines connected to the main line, the plurality of branch lines are dispersedly inserted into the ground, and the main line is electrically connected to one of the electrode bodies.

7. An overvoltage protection device for overhead power transmission line construction according to claim 6, characterized in that: The overvoltage protection device also includes a coil sleeved on a portion of the transmission line, and the coil is connected to the ground through the grounding unit.

8. An overvoltage protection device for overhead power transmission line construction according to claim 7, characterized in that: The overvoltage protection device further comprises a resistance adjusting unit, which provides a high resistance for the power transmission line when the power transmission line has an overvoltage.

9. An overvoltage protection device for overhead power transmission line construction according to claim 8, characterized in that: The resistance adjustment unit includes an electric push rod, a low-resistance contact, a high-resistance contact and a gate plate. The gate plate is electrically connected to one of the low-resistance contact and the high-resistance contact and is installed in series in a power transmission line. The electric push rod adjusts the position of the gate plate between the low-resistance contact and the high-resistance contact, and the coil provides electrical energy to the electric push rod.

10. A method for using an overvoltage protection device for overhead power transmission line construction, applicable to the overvoltage protection device for overhead power transmission line construction according to claim 9, characterized in that: The steps include: Assemble the equipment and connect it to the transmission line; Adjusting the distance between the two electrode bodies and fixing them on the isolation box; allowing an inert gas to flow between the isolation box and the gas storage box; When the power transmission line is operating normally, the two electrode bodies are in a disconnected state, and no induced current is generated in the coil; When an overvoltage occurs in the transmission line, an electric field is generated between the two electrode bodies and the inert gas is ionized, and the electric energy is introduced into the ground through the two electrode bodies and the grounding unit, and the coil will generate an inductance effect due to the change of the magnetic field around the transmission line, and the coil will hinder the current in the transmission line, and the induced current generated in the coil will be transmitted to the ground through the resistance adjustment unit and the grounding unit, and the resistance adjustment unit will simultaneously connect a high resistance to the transmission line; The inert gas flows and absorbs electrical energy.

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