Three-phase combined overvoltage protection lightning arrester for power system

Abstract

The utility model relates to the technical field of overvoltage protectors, and discloses a three-phase combined overvoltage protection lightning arrester for an electric power system, which comprises a bottom box, three three-phase connecting ends are arranged on the bottom box, a grounding column is further arranged on the bottom box, an insulating cylinder is arranged in the bottom box, a gap body is arranged in the insulating cylinder, and the three-phase connecting ends and the grounding column are arranged in the gap body. The gap body comprises four adjustable gap groups arranged in the insulating cylinder, conductive wires are arranged on the four adjustable gap groups, and the three-phase connecting end and the grounding column are connected with the corresponding conductive wires respectively; the gap body is isolated from the external environment through the bottom box and the insulating cylinder, the three-phase connecting end and the adjustable gap group are connected in series and grounded, inter-phase and phase-ground overvoltage protection is provided for the device, the adjusting head is screwed to drive the copper cap to axially move along the cylinder, the discharge gap between the copper end cap and the copper cap is adjusted, and the discharge gap between the copper end cap and the copper cap is adjusted. The precision of the discharge gap is improved, the protection effect is good, and the discharge gap can be adjusted.

Description

Technical Field

[0001] The present application relates to the technical field of overvoltage protectors, and in particular to a three-phase combined overvoltage protection arrester for a power system. Background Art

[0002] In power systems, overvoltage protection is crucial for ensuring safe equipment operation. Conventional three-phase surge arresters, widely used in the market, typically use zinc oxide resistors as their core components. While these arresters can suppress overvoltages to a certain extent, they also have limitations.

[0003] In particular, traditional three-phase combined overvoltage arresters lack a fast and flexible gap adjustment mechanism when facing overvoltage protection requirements in diverse power grid environments. This makes it difficult to achieve optimal overvoltage protection in certain situations, potentially impacting the long-term stable operation of the equipment. Utility Model Content

[0004] In order to solve the problem that traditional three-phase combined overvoltage protection arresters usually lack a gap adjustment mechanism and are difficult to achieve optimal overvoltage protection effects in some cases, the present application provides a three-phase combined overvoltage protection arrester for a power system.

[0005] The present application provides a three-phase combined overvoltage protection arrester for a power system adopts the following technical solution:

[0006] A three-phase combined overvoltage protection arrester for a power system includes a bottom box, three three-phase connection terminals are provided on the bottom box, a grounding column is also provided on the bottom box, an insulating cylinder is provided inside the bottom box, and a gap body is provided inside the insulating cylinder;

[0007] The gap body includes four adjustable gap groups arranged in an insulating cylinder, and conductive wires are arranged on the four adjustable gap groups. The three-phase connection ends and the grounding posts are respectively connected to corresponding conductive wires.

[0008] Preferably, the three-phase connection end includes a zinc oxide resistor column arranged on the bottom box, the upper end of the zinc oxide resistor column is provided with a silicone rubber cable, the lower end of the zinc oxide resistor column is provided with a power connection column, and one end of the power connection column and the grounding column are both located inside the bottom box.

[0009] Preferably, the insulating cylinder comprises a straight cylinder arranged on the bottom box, a layer plate is arranged inside the straight cylinder, end covers are arranged at both ends of the straight cylinder, and a plurality of partition plates are arranged on the layer plate to form a plurality of partition chambers with the layer plate.

[0010] Preferably, the adjustable gap group includes copper end caps arranged in the partition chamber, and two adjacent copper end caps are electrically connected. The outer side of the copper end caps is sleeved with a cylinder, and the inner side of the cylinder is provided with a copper cap, and the copper cap can move axially along the cylinder.

[0011] Preferably, the copper cap is provided with an adjusting head, the adjusting head is transmission-connected to the cylinder, and the conductive wire is electrically connected to the copper cap.

[0012] In summary, this application has the following beneficial technical effects:

[0013] The gap body is isolated from the external environment by the base box and the insulating cylinder. The three-phase connection end is connected in series with the adjustable gap group and grounded to provide phase-to-phase and phase-to-ground overvoltage protection for the device. The copper cap is driven to move axially along the cylinder by twisting the adjusting head to adjust the discharge gap between the copper end caps and the copper caps, thereby improving the accuracy of the discharge gap. Compared with the existing technology, it has good protection effect and can adjust the discharge gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of a first-perspective three-dimensional structure of an embodiment of the application;

[0015] Figure 2 is a schematic diagram of a second perspective three-dimensional structure of an embodiment of the application;

[0016] Figure 3 is a schematic diagram of a three-dimensional structure from a third perspective of an embodiment of the application;

[0017] Figure 4 for Figure 3 A magnified schematic diagram of the structure in the middle.

[0018] Explanation of the accompanying drawings: 1. Base box; 2. Three-phase connection terminal; 201. Zinc oxide resistor column; 202. Silicone rubber cable; 203. Power connection column; 3. Grounding column; 4. Insulation cylinder; 401. Straight cylinder; 402. End cover; 403. Layer; 404. Partition; 5. Gap body; 501. Voltage equalizing plate; 5011. Copper plate; 5012. Copper end cap; 502. Cylinder; 503. Adjustment head; 5031. Threaded end; 5032. Elastic card; 504. Copper cap; 505. Conductive wire. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-4 This application is described in further detail.

[0020] The embodiment of the present application discloses a three-phase combined overvoltage protection arrester for a power system. Figure 1-3A three-phase combined overvoltage protection arrester for a power system includes a base box 1 with three three-phase connection terminals 2 mounted on the top. The three three-phase connection terminals 2 include a zinc oxide resistor column 201 mounted on the base box 1. The zinc oxide resistor column 201 is composed of multiple zinc oxide resistors and two conductive electrodes connected in series, and is sheathed with an insulating layer. The zinc oxide resistors are first connected in series, with their upper and lower ends connected to a conductive electrode respectively. Insulating glass cloth is then wrapped around the zinc oxide resistors and baked in an oven to dry, thus forming a cylindrical zinc oxide resistor. Due to the thermal contraction of the insulating glass cloth, the zinc oxide resistors and the conductive electrodes are tightly bonded to each other. The insulating layer is formed by integrally molding the mounting column with silicone rubber at high temperature, and a silicone rubber jacket is formed on the periphery of the mounting column to form a silicone rubber jacket column, which is sleeved on the outside of the columnar zinc oxide resistor to form a zinc oxide resistor column 201. The conductive electrode at the upper end of the zinc oxide resistor column 201 is connected to the silicone rubber cable 202, and the silicone rubber cable 202 is connected to the high-voltage side. The conductive electrode at the lower end of the zinc oxide resistor column 201 is connected to the power connection column 203. There is a grounding column 3 on the side of the bottom box 1. One end of the power connection column 203 and the grounding column 3 are both located inside the bottom box 1, and the grounding column 3 is connected to the external grounding wire.

[0021] Reference Figure 3 An insulating cylinder 4 is also installed in the bottom box 1. The insulating cylinder 4 includes a straight cylinder 401 installed on the bottom box 1. A layer plate 403 is installed inside the straight cylinder 401. End covers 402 are threadedly installed on both ends of the straight cylinder 401. Several partitions 404 are installed on the layer plate 403. The partitions 404 and the layer plates 403 form several partition chambers. For example, three partitions 404 are all installed on one side surface of the layer plate 403. Three three-phase isolation chambers and one grounding isolation chamber are separated by the straight cylinder 401, the partitions 404 and the layer plates 403 to avoid mutual influence between the adjustable gap groups installed in the partition chambers.

[0022] Reference Figure 3 A gap body 5 is installed inside the insulating tube 4, and the gap body 5 includes four adjustable gap groups. The adjustable gap group is installed in the equalizing plate 501 in the inner grounding isolation chamber. The equalizing plate 501 includes a copper plate 5011 installed in the grounding isolation chamber. The copper plate 5011 is stamped and formed by a customized mold to form four copper end caps 5012 with one positive and three negative. Three of the copper end caps 5012 pass through the end cover 402 and enter the corresponding three-phase isolation chamber. The outer side of the copper end caps 5012 is fixedly sleeved with a cylinder 502, and an adjusting head 503 is installed on the end of the cylinder 502 away from the copper end cap 5012. A copper cap 504 is installed on the side of the adjusting head 503 close to the equalizing plate 501.

[0023] Reference Figure 4The adjusting head 503 includes a threaded end 5031 threadedly installed on the cylinder 502, and a number of elastic cards 5032 are installed on the threaded end 5031. The outer side of the elastic card 5032 is provided with a notch groove adapted to the copper cap 504, which facilitates the copper cap 504 to be snapped onto the elastic card 5032. A conductive wire 505 is installed on the copper cap 504, and the conductive wire 505 can move through the threaded end 5031 to reach the outside of the threaded end 5031. The ends of the conductive wires 505 in the three-phase isolating chamber respectively move through the straight cylinder 401 and are connected to the corresponding power posts 203, and the conductive wires 505 in the grounding isolating chamber pass through the straight cylinder 401 and are connected to the grounding post 3.

[0024] The implementation principle of the three-phase combined overvoltage protection arrester for a power system in the embodiment of the present application is as follows:

[0025] Normal working state: Under normal working voltage, the zinc oxide resistor column 201 is in a high resistance state and does not conduct current.

[0026] Overvoltage: When an overvoltage occurs on a phase, the zinc oxide resistor column 201 switches to a low-resistance state. The overvoltage is transmitted to the adjustable gap group through the power connection column 203 at the lower end of the zinc oxide resistor column 201. The adjustable gap group breaks down to form an arc, discharging the overvoltage energy to the grounding column 3. From there, the energy is discharged to the ground, protecting the power system from overvoltage damage. When an overvoltage occurs between phases, the gap group breaks down to form a protective path, dissipating the overvoltage energy.

[0027] By turning the threaded end 5031 on the adjustment head 503, the elastic clip 5032 and the copper cap 504 move, changing the gap and, therefore, the breakdown voltage, to meet the protection requirements of different environments. Customization is also possible, with zinc oxide resistor columns 201 of varying specifications ensuring effective protection of power systems at varying voltage levels.

[0028] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "Up," "down," "left," and "right" are only used to indicate relative positional relationships. When the absolute positions of the objects being described change, the relative positional relationships may also change.

[0029] Secondly: The drawings of the embodiments disclosed in this utility model only involve structures related to the embodiments disclosed in this utility model. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the utility model can be combined with each other.

[0030] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0031] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A three-phase combined overvoltage protection arrester for a power system, comprising a bottom box (1), characterized in that: The bottom box (1) is provided with three three-phase connection terminals (2), the bottom box (1) is also provided with a grounding column (3), an insulating cylinder (4) is provided inside the bottom box (1), and a gap body (5) is provided inside the insulating cylinder (4); The gap body (5) comprises four adjustable gap groups arranged in an insulating cylinder (4), each of the four adjustable gap groups is provided with a conductive wire (505), and the three-phase connection end (2) and the grounding column (3) are respectively connected to the corresponding conductive wire (505).

2. The three-phase combined overvoltage protection arrester for a power system according to claim 1, characterized in that: The three-phase connection end (2) comprises a zinc oxide resistance column (201) arranged on the bottom box (1), a silicone rubber cable (202) being arranged at the upper end of the zinc oxide resistance column (201), and a power connection column (203) being arranged at the lower end of the zinc oxide resistance column (201), and one end of the power connection column (203) and the grounding column (3) are both located inside the bottom box (1).

3. The three-phase combined overvoltage protection arrester for a power system according to claim 1, characterized in that: The insulating cylinder (4) comprises a straight cylinder (401) arranged on the bottom box (1), a layer plate (403) is arranged inside the straight cylinder (401), end covers (402) are arranged at both ends of the straight cylinder (401), and a plurality of partition plates (404) are arranged on the layer plate (403) for forming a plurality of partition chambers with the layer plate (403).

4. The three-phase combined overvoltage protection arrester for a power system according to claim 3, characterized in that: The adjustable gap group includes copper end caps (5012) arranged in the partition chamber, and two adjacent copper end caps (5012) are electrically connected. The outer side of the copper end caps (5012) is sleeved with a cylinder (502), and the inner side of the cylinder (502) is provided with a copper cap (504), and the copper cap (504) can move axially along the cylinder (502).

5. The three-phase combined overvoltage protection arrester for a power system according to claim 4, characterized in that: The copper cap (504) is provided with an adjusting head (503), the adjusting head (503) is transmission-connected to the cylinder (502), and the conductive wire (505) is electrically connected to the copper cap (504).

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