An overvoltage protection device and its usage method for overhead transmission line construction

Abstract

The present invention relates to the technical field of electrical equipment, and particularly to an overvoltage protection device and a usage method for overhead transmission line construction, which includes an isolation box and a gas storage box. Inert gas is stored in both the isolation box and the gas storage box, and the inert gas circulates between the isolation box and the gas storage box; two electrode bodies are oppositely arranged in the isolation box, one of the electrode bodies is connected to the transmission line, and the other electrode body is connected to the ground through a grounding unit; by circulating 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 conduction of the inert gas, the characteristic of the inert gas absorbing energy during ionization is utilized to absorb electric energy, thereby significantly improving the energy absorption capacity and the overvoltage protection effect.

Description

Technical Field

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

[0002] With the continuous growth of global power demand, the demand for efficient and reliable power transmission is also increasing day by day. Especially in large-scale infrastructure construction and the process of urbanization, the expansion and upgrade of the power transmission network have become an important link to ensure economic development. However, in this process, the construction and maintenance of overhead transmission lines face various challenges, and one of them is how to effectively prevent the potential threats caused by overvoltage phenomena 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, operation errors, faults, or other factors. For an overhead transmission line under construction, overvoltage may not only cause damage to newly installed equipment but also endanger the safety of on-site operators. In addition, overvoltage events may also lead to power supply interruptions, affecting 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 two electrodes, making the resistance of the device lower than that of the normal circuit and conducting electricity, and transferring the excess electrical energy of the overvoltage to the ground, so as to achieve the purpose of protecting the transmission line and equipment. However, the protection device of this structure only utilizes the ionization and conduction effect of the inert gas. When the inert gas is ionized, it will absorb part of the electrical energy. Since the inert gas between the two plates is relatively small, this way of absorbing electrical energy 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 and a usage method for overhead transmission line construction, and the specific technical solutions adopted are as follows:

[0006] According to a first aspect of the present invention, there is provided an overvoltage protection device for overhead transmission line construction, including an isolation box and a gas storage box. Inert gases are stored in both the isolation box and the gas storage box, and the inert gases circulate between the isolation box and the gas storage box;

[0007] Two electrode bodies are oppositely arranged in the isolation box. One electrode body is connected to the transmission line, and the other electrode body is connected to the ground through a grounding unit.

[0008] In some embodiments of the present invention, the inert gas includes at least one of neon, argon, and xenon.

[0009] In some embodiments of the present invention, a number of heat sinks are arranged on the gas storage tank.

[0010] In some embodiments of the present invention, the end face of each electrode body is set as a conical surface, and the conical surfaces on the two electrode bodies face each other.

[0011] In some embodiments of the present invention, the distance between the two electrode bodies is adjustable.

[0012] In some embodiments of the present invention, the grounding unit includes a main line and a number of branch lines connected to the main line. The number of branch lines are dispersed and inserted into the ground, and the main line is electrically connected to one of the electrode bodies.

[0013] In some embodiments of the present invention, the overvoltage protection device further includes a coil sleeved on part of the transmission line, and the coil is connected to the ground through the grounding unit.

[0014] In some embodiments of the present invention, the overvoltage protection device further includes a resistance adjustment unit, and the resistance adjustment unit provides a high resistance for the transmission line when the transmission line has an overvoltage.

[0015] 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 brake pad. The brake pad is electrically connected to one of the low-resistance contact and the high-resistance contact and is serially installed in the transmission line. The electric push rod adjusts the position of the brake pad between the low-resistance contact and the high-resistance contact, and the coil provides electrical energy for the electric push rod.

[0016] Second, a method for using an overvoltage protection device for overhead transmission line construction according to the present invention includes the following steps:

[0017] Assemble the device and connect it to the transmission line;

[0018] Adjust the distance between the two electrode bodies and fix them on the isolation box;

[0019] Make the inert gas flow between the isolation box and the gas storage tank;

[0020] When the transmission line is working normally, the two electrode bodies are in a disconnected state, and no induced current will be generated in the coil;

[0021] When an overvoltage occurs in the transmission line, an electric field is generated between the two electrode bodies to ionize the inert gas. Electrical energy is introduced into the ground through the two electrode bodies and the grounding unit. And the coil will generate an inductive effect due to the change in the magnetic field around the transmission line. The coil will impede the current in the transmission line, and the induced current generated in the coil will be transmitted to the ground through the resistance adjusting unit and the grounding unit. The resistance adjusting unit will simultaneously connect a high resistance into the transmission line;

[0022] The inert gas flows and absorbs electrical energy.

[0023] The beneficial effects of the present invention are as follows:

[0024] By circulating the inert gas between the isolation box and the gas storage tank, fresh inert gas can be continuously provided for ionization and breakdown. Thus, while ensuring the normal ionization and conduction of the inert gas, the characteristic that the inert gas absorbs energy during ionization is utilized to absorb electrical energy, thereby significantly improving the energy absorption capacity and enhancing the overvoltage protection effect. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is a schematic cross-sectional structure diagram of the isolation box in the embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of the coil in the embodiment of the present invention;

[0029] Figure 4 is a schematic structural diagram of the resistance adjusting unit in the embodiment of the present invention.

[0030] Reference Signs:

[0031] 100. Isolation box; 101. Electrode body; 102. Gas storage tank; 103. Insulating sleeve; 104. Conductive column; 105. Main line; 106. Branch line; 107. Movable plate; 108. Push-pull rod; 109. Motor; 110. Turntable;

[0032] 200. Coil;

[0033] 300. Resistance adjusting unit; 301. Electric push rod; 302. Low-resistance contact point; 303. High-resistance contact point; 304. Brake pad. Detailed implementation manners

[0034] The following combines the accompanying drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0035] As Figures 1 to 4 shown, an overvoltage protection device for overhead transmission line construction of the present invention includes an isolation box 100 and a gas storage box 102. Inert gases are stored in both the isolation box 100 and the gas storage box 102, and the inert gases flow between the isolation box 100 and the gas storage box 102; in the present invention, the isolation box 100 mainly provides a space for the ionization and breakdown of inert gases, and the gas storage box 102 is mainly used for storing and exchanging inert gases. The isolation box 100 and the gas storage box 102 are connected through two delivery pipes. And in order to realize the flow of inert gases, a delivery pump can be installed on the gas storage box 102 to provide power for the flow of inert gases between the isolation box 100 and the gas storage box 102; of course, when the inert gas is ionized, it will move along the electric field direction, thereby assisting in driving the flow of inert gas in the isolation box 100;

[0036] Two electrode bodies 101 are oppositely arranged 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 a grounding unit; in this way, through the two electrode bodies 101, a channel can be formed between the transmission line and the ground. When there is no discharge phenomenon between the two electrode bodies 101, this channel is in an open state, and the current in the transmission line will not be transmitted to the ground; and when the transmission line generates overvoltage, the voltage between the transmission line and the ground is relatively large, that is, the voltage between the two electrode bodies 101 is relatively large. At this time, a relatively large electric field will be generated between the two electrode bodies 101. The electric field acts on the inert gas, thereby ionizing and breaking down the inert gas, enabling the current to flow between the two electrode bodies 101, and thus enabling the electric energy to be transmitted to the ground, so that the protection of the equipment in the transmission line is realized;

[0037] In the present invention, when the electric field strength exceeds the breakdown threshold of the inert gas, gas molecules are ionized to form free electrons and positive ions. Under the action of the electric field, the free electrons move towards the electrode body 101 acting as the positive electrode and are absorbed by it, while the positive ions move towards the electrode body 101 acting as the negative electrode and recombine with the electrons on the surface to form neutral atoms. The neutral atoms formed after recombination will be released from the surface of the electrode body 101 and re-enter the gas. In this way, the gas that has absorbed electrical energy will enter the gas storage tank 102 from the isolation tank 100, and the non-ionized gas in the gas storage tank 102 will be replenished into the isolation tank 100. Thus, by using the continuous ionization of the inert gas, the inert gas continuously absorbs electrical energy, and the characteristic of the inert gas ionization absorbing energy is used to protect the transmission line during overvoltage;

[0038] Since the inert gas between the two electrode bodies 101 is ionized during overvoltage, its resistance is smaller than that of the electrical equipment installed in the transmission line. At this time, electrical energy will be directly conducted to the ground, and the voltage applied to the electrical equipment in the transmission line is relatively small, thereby achieving the protection effect;

[0039] By circulating the inert gas between the isolation tank 100 and the gas storage tank 102, fresh inert gas can be continuously provided for ionization and breakdown. Thus, while ensuring the normal ionization and conduction of the inert gas, the characteristic of the inert gas absorbing energy during ionization is used to absorb electrical energy, thereby significantly improving the energy absorption capacity and the overvoltage protection effect.

[0040] Furthermore, the inert gas includes at least one of neon, argon, and xenon;

[0041] For the gases listed above, their ionization phases are relatively low, and their chemical properties are stable. They 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 a wide application prospect and significant protection effect in the construction of overhead transmission lines; moreover, as a preference, the above gases can be used singly or in a mixed manner. When mixed, it can achieve the covering applicability effect for multiple voltage occasions.

[0042] Optimized from the above implementation, a number of heat sinks are arranged on the gas storage tank 102;

[0043] During the process of the positive ions restoring to neutral atoms, a large amount of energy will be released, which will cause the temperature around the electrode body 101 acting as the negative electrode to rise. At this time, due to the circulating flow of the inert gas, the gas can carry the heat into the gas storage tank 102, and the high-temperature inert gas exports the heat through the gas storage tank 102 and the heat sinks on it, thereby achieving the heat dissipation function;

[0044] Since heat volatilizes on the gas storage tank 102, heat concentration in the isolation box 100 can be avoided, and damage to the structures within the isolation box 100 can be prevented, achieving a separated heat dissipation method; this way of absorbing, transferring, and releasing energy realizes the safe transmission and dissipation of energy, and realizes the sponge-like energy storage method of inert gas, facilitating the buffering effect on the energy during overvoltage.

[0045] To facilitate the concentration of the electric field between the two electrode bodies 101 and make it easier to achieve ionization and breakdown effects within the isolation box 100, the following method can be adopted Figure 2 As shown, the end face of each electrode body 101 is set as a conical surface, and the conical surfaces on the two electrode bodies 101 face each other; in this way, by using the conical surface, it is convenient to concentrate the electric field between the tips of the two conical surfaces, thereby enhancing the electric field strength and facilitating the breakdown of the inert gas more easily. This structural design can improve the sensitivity of the device; in the present invention, as a preferred implementation, the electrode body 101 can adopt a conical shape such as a circular cone or a pyramid, or any shape such as an ellipse, a parabola, or a curve with a converging effect at the tip, as long as it can achieve the effect of concentrating the electric field, it is within the protection scope of this case.

[0046] 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 situations, 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;

[0047] During actual use, the moving direction of the electrode body 101 can be along the direction of the perpendicular connection 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 provided thereon, that is, as Figure 2 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 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 power transmission line or the grounding unit;

[0048] Optimized based on 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 manually or by a mechanical structure. Specifically, an insulating movable plate 107 is provided on each conductive column 104. The movable plate 107 is slidably mounted on the outer wall of the isolation box 100 along the axial direction of the isolation box 100. A push-pull rod 108 is inclined and rotatably provided on each movable plate 107. A motor 109 is provided between the two movable plates 107. A turntable 110 is provided at the output end of the motor 109. The push-pull rod 108 is eccentrically connected to the turntable 110. In this way, when the motor 109 drives the turntable 110 to rotate, it will drive the two movable plates 107 to approach or move 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;

[0049] During actual use, for convenient installation, a chassis can be set, and the structure of this case can be installed in the chassis.

[0050] Such as Figure 2 shown, optimized based on the above implementation, the grounding unit includes a main line 105 and a plurality of branch lines 106 connected to the main line 105. The plurality of branch lines 106 are dispersed and inserted into the ground. 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 arrangement of the plurality of branch lines 106 can disperse the current and reduce the potential of the single-point grounding position; the way the branch lines 106 are inserted into the ground can reduce the rise of the ground potential, thereby facilitating the protection of personnel and equipment on the ground.

[0051] As a preference of the above implementation, such as Figure 2 shown, the overvoltage protection device further includes a coil 200 sleeved on part of the transmission line. The coil 200 is connected to the ground through the grounding unit; the coil 200 is also installed in the chassis, and the transmission line passes through the coil 200 for transmission. When overvoltage occurs, the magnetic field around the transmission line changes. At this time, the coil 200 in the magnetic field will, due to the inductance effect, impede the change of the current in the line, thereby achieving a primary protection effect, and this method can also achieve a filtering effect; since the coil 200 is grounded, the induced current generated in the coil 200 will be directly transmitted to the ground, thereby using the coil 200 to transfer part of the electrical energy away, thereby achieving a secondary protection effect, and in this way, multiple protection methods are achieved;

[0052] 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 convenient 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 overvoltage occurs, the impedance of the coil 200 drops sharply and forms a low-resistance path, thereby realizing the rapid export and release of electric energy and achieving an efficient protection effect.

[0053] Further, as Figure 3 shown, the number of coils 200 is set to several, and several coils 200 are sleeved and arranged in sequence from the inside to the outside, and 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 of 20 can be increased, thereby improving the inductance effect; this sleeved method can minimize the space occupied by the structure.

[0054] To further improve the protection effect, as Figure 4 shown, the overvoltage protection device further includes a resistance adjustment unit 300. The resistance adjustment unit 300 provides a high resistance for the transmission line when the transmission line has an overvoltage; when an overvoltage occurs in the transmission line, the resistance adjustment unit 300 can connect the high resistance into the transmission line, thereby increasing the difference value between the resistance in the transmission line and the resistance when the inert gas in the isolation box 100 breaks down, further reducing the current flowing on the transmission line, increasing the electric energy release amount, and thus improving the protection effect.

[0055] In the present invention, optimized based on the above implementation, as Figure 4 shown, the resistance adjustment unit 300 includes an electric push rod 301, a low-resistance contact 302, a high-resistance contact 303, and a brake pad 304. The brake pad 304 is electrically connected to one of the low-resistance contact 302 and the high-resistance contact 303 and is serially installed in the transmission line. The electric push rod 301 adjusts the position of the brake pad 304 between the low-resistance contact 302 and the high-resistance contact 303, and the coil 200 provides electric energy for the electric push rod 301;

[0056] 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 brake pad 304 is connected to the circuit as the other pole. The brake pad 304 can be connected to one of the low-resistance contact 302 and the high-resistance contact 303 to conduct the circuit. The electric push rod 301 is used to provide power for the movement of the brake pad 304. When the low-resistance contact 302 is electrically connected to the brake pad 304, the transmission line is in a normal state. When the high-resistance contact 303 is electrically connected to the brake pad 304, the transmission line is in an overvoltage state. At this time, the access of the high-resistance contact 303 can increase the resistance of the transmission line. Since an induced current will be generated inside the coil 200 during overvoltage, this part of electrical energy can be used to provide power for the movement of the electric push rod 301, thus avoiding the cumbersome operations of arranging a power supply and a controller for the electric push rod 301 and simplifying the structural and operating modes.

[0057] 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 brake pad 304 in an electrically connected state. During overvoltage, the electric push rod 301 is energized and will cause the brake pad 304 to move, and the brake pad 304 is electrically connected to the high-resistance contact 303.

[0058] A method for using an overvoltage protection device for overhead transmission line construction according to the present invention includes the following steps:

[0059] Assemble the device and connect it to the transmission line;

[0060] Adjust the distance between the two electrode bodies 101 and fix them on the isolation box 100;

[0061] Make the inert gas flow between the isolation box 100 and the gas storage tank 102;

[0062] When the transmission line is working normally, the two electrode bodies 101 are in an open state, and no induced current will be generated in the coil 200;

[0063] When an overvoltage occurs in the transmission line, an electric field is generated between the two electrode bodies 101 to ionize the inert gas. Electrical energy is introduced into the ground through the two electrode bodies 101 and the grounding unit. And the coil 200 will generate an inductive effect due to the change of the magnetic field around the transmission line. The coil 200 will impede the current in the transmission line, and the induced current generated in the coil 200 will be transmitted to the ground through the resistance adjustment unit 300 and the grounding unit. The resistance adjustment unit 300 will simultaneously connect a high resistance to the transmission line;

[0064] The inert gas flows and absorbs electrical energy.

[0065] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope 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; 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; The overvoltage protection device further comprises a coil sleeved on a portion of the transmission line, and the coil is connected to the ground through the grounding unit; The overvoltage protection device further comprises a resistance adjusting unit, which provides a high resistance for the transmission line when the transmission line is overvoltage; 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.

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. 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 5, 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.

Images