A three-phase sub-enclosure grounding switch and GIS equipment based on environmentally friendly gas insulation

Abstract

This utility model relates to the field of switchgear technology, and discloses a three-phase sub-enclosure grounding switch and GIS equipment based on environmentally friendly gas insulation. The three-phase sub-enclosure grounding switch includes a grounding switch housing, with stationary contact assemblies and moving contact assemblies installed on opposite sides of the housing, and a grounding switch gas chamber between the stationary and moving contact assemblies. The stationary contact assembly includes a stationary contact seat and a stationary arc contact located within the stationary contact seat. A moving contact assembly cavity is provided on the grounding switch housing opposite the stationary contact assembly, and the moving contact assembly cavity communicates with the crank arm box cavity. The moving contact assembly includes a moving contact, a piston, a pressure cylinder, and a contact finger seat. This utility model enables the moving contact of the grounding switch to have an air blowing / drawing function during the opening / closing process, improving the arc extinguishing effect when the grounding switch interrupts induced current, and meeting the requirements of GIS grounding switches for opening and closing induced current under environmentally friendly gas conditions.

Description

Technical Field

[0001] This utility model relates to the field of switchgear technology, and more specifically, to a three-phase sub-enclosed grounding switch and GIS equipment based on environmentally friendly gas insulation. Background Technology

[0002] When grounding switches in GIS products switch on or off with induced current, an electric arc is generated between the moving and stationary contacts. Most existing GIS equipment uses SF6 gas as the insulating medium. Due to the excellent arc-extinguishing properties of SF6 gas, the structure of the grounding switch is usually relatively simple. Only appropriate opening and closing speeds are needed, and the arc, under natural cooling conditions, can meet the requirements of the power grid system for the grounding switch's induced current capacity. However, SF6 gas is a strong greenhouse gas restricted by international conventions, with a global warming potential (GWP) approximately 23,900 times that of CO2. Therefore, based on environmental protection requirements, it is necessary to develop GIS equipment based on environmentally friendly gas insulation to replace traditional SF6 high-voltage switchgear.

[0003] Currently, commonly used environmentally friendly gases are usually mixtures of gases with N2 as the main component or mixtures of gases with CO2 as the main component. However, their arc extinguishing ability is weaker than that of SF6 gas. In other words, in an environmentally friendly gas environment, the electric arc is difficult to extinguish naturally. The arc is extinguished mainly by reducing the arc temperature and reducing the plasma between the contacts. This means that existing grounding switches usually cannot meet the requirements of the power grid system for the opening and closing induced current capability of the grounding switch under environmentally friendly gas conditions.

[0004] Therefore, existing grounding switches based on environmentally friendly gas insulation have weakened arc-extinguishing characteristics due to the reduced breaking capacity of the insulating medium. This necessitates further improvements in the breaking capacity of the grounding switches to meet the requirements of the power grid system for the induced current capacity of the grounding switches. Utility Model Content

[0005] In view of this, and in response to the shortcomings of the existing technology, this utility model proposes a three-phase sub-box grounding switch and GIS equipment based on environmentally friendly gas insulation, which enhances the arc extinguishing capability of the grounding switch during opening and closing processes, and meets the requirements of the power grid system for the opening and closing induced current capability of the grounding switch based on environmentally friendly gas insulation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a three-phase sub-box grounding switch based on environmentally friendly gas insulation, including a grounding switch housing, in which a stationary contact assembly and a moving contact assembly are respectively installed on opposite sides of the grounding switch housing, and the space between the stationary contact assembly and the moving contact assembly is the grounding switch gas chamber; The stationary contact assembly includes a stationary contact seat mounted on the housing of the grounding switch and a stationary arc contact located within the stationary contact seat; The grounding switch housing opposite the stationary contact assembly has a moving contact assembly cavity. The grounding switch housing is connected to the crank arm box, so that the side of the moving contact assembly cavity away from the grounding switch air chamber is connected to the crank arm box cavity. The moving contact assembly includes a moving contact, a piston, a pressure cylinder, and a contact finger seat. The outer wall of the moving contact is fixedly connected to the piston and slidably disposed in the pressure cylinder. The pressure cylinder is disposed in the moving contact assembly cavity, and the end of the pressure cylinder away from the grounding switch air chamber is connected to the contact finger seat. The contact finger seat is connected to the inner wall of the crank arm box. An internal gas channel is axially opened inside the moving contact, near the stationary contact. An opening for communicating with the internal gas passage is provided on the moving contact end, while the second moving contact end, which is away from the stationary contact end, is completely blocked; a contact seat through hole is provided axially inside the contact finger seat, and the second moving contact end passes through the contact finger seat through hole and extends into the crank arm box cavity; the moving contact, the piston, the pressure cylinder, and the contact finger seat together form a sealed pressure chamber, and the moving contact inside the pressure chamber is provided with a moving contact vent hole corresponding to communicating with the internal gas passage; a plurality of pressure cylinder exhaust holes are provided on the outer peripheral wall of the pressure cylinder on the side near the grounding switch gas chamber, and a cylinder port for the first moving contact end to slide out is provided at the end of the pressure cylinder near the grounding switch gas chamber.

[0007] Preferably, the piston has a first groove on its outer periphery, and a first guide ring for sealing the pressure chamber and guiding the movement of the moving contact is installed in the first groove.

[0008] Preferably, several second grooves are formed on the inner wall of the contact finger seat corresponding to the through hole of the contact finger seat. A portion of the second grooves are used to install spring contact fingers for current flow, and the remaining second grooves are used to install second guide rings for sealing the air chamber and guiding the movement of the moving contact.

[0009] Preferably, the air cylinder and the finger seat are integrally connected or connected by bolts.

[0010] Preferably, a moving end shield is installed at the end of the air cylinder near the grounding switch chamber; an array of circular or elongated exhaust holes are provided on the outer peripheral wall of the air cylinder.

[0011] Preferably, the distance between the vent hole of the moving contact and the piston is 20mm to 50mm.

[0012] Preferably, the second moving contact end is connected to a drive rod via an insulating connector. An operating mechanism assembly is provided on the outside of the grounding switch housing. The drive head of the operating mechanism assembly extends into the crank arm box cavity and is connected to the drive rod. The operating mechanism assembly is used to drive the moving contact to move closer to or away from the stationary arc contact.

[0013] Preferably, the finger seat is connected to the grounding terminal on the crank arm box via a grounding busbar.

[0014] Preferably, an external gas channel communicating with the air chamber of the grounding switch is provided between the outer wall of the air cylinder and the inner wall of the corresponding grounding switch housing, and an airflow channel communicating with the crank arm box cavity and the external gas channel is provided at the finger seat.

[0015] This utility model also provides a GIS device, including one of the above-mentioned three-phase sub-box grounding switches based on environmentally friendly gas insulation.

[0016] Compared with existing technologies, the three-phase sub-enclosure grounding switch and GIS equipment based on environmentally friendly gas insulation of this utility model have the following beneficial effects: (1) During the opening process of the grounding switch of this utility model, the insulating medium in the compressed air chamber is compressed by the piston, so that the insulating medium can be quickly discharged into the grounding switch air chamber through the gas internal channel in the moving contact, thereby extinguishing the electric arc.

[0017] (2) During the closing process of the grounding switch of this utility model, the space of the air chamber increases due to the movement of the piston, the pressure in the air chamber decreases, and the insulating medium in the air chamber of the grounding switch will be re-inhaled into the air chamber through the gas channel in the moving contact, thereby enhancing the ability of the grounding switch to close the induced current or short-circuit current.

[0018] (3) Through innovative structural design, this utility model enables the moving contact of the grounding switch to have the function of blowing / absorbing air during the opening / closing process, which improves the arc extinguishing effect when the grounding switch interrupts the induced current and meets the requirements of the grounding switch for GIS to open and close the induced current under environmentally friendly gas conditions. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a cross-sectional view of a three-phase sub-box grounding switch based on environmentally friendly gas insulation according to this utility model.

[0021] Figure 2 This is a schematic diagram of the medium-pressure cylinder of a three-phase sub-box grounding switch based on environmentally friendly gas insulation, according to this utility model.

[0022] Figure 3 This is a schematic diagram of the assembly of the moving contact and piston in a three-phase sub-box grounding switch based on environmentally friendly gas insulation according to this utility model.

[0023] In the diagram: 1-Grounding switch housing, 2-Grounding switch gas chamber, 3-Stationary contact seat, 4-Stationary arc contact, 5-Crank arm box, 6-Moving contact, 7-Piston, 8-Pressure cylinder, 9-Contact finger seat, 10-Inner gas channel, 11-Pressure chamber, 12-Moving contact vent, 13-Pressure cylinder exhaust port, 14-First guide ring, 15-Second groove, 16-Moving end shield, 17-Drive rod, 18-Operating mechanism assembly, 19-Grounding bar, 20-Grounding terminal, 21-Outer gas channel, 22-Airflow channel. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] Example: This embodiment provides a three-phase sub-box grounding switch based on environmentally friendly gas insulation, which is a grounding switch with blowing and sucking functions for the moving contact.

[0026] Specifically, such as Figures 1-3 As shown, the three-phase sub-box grounding switch based on environmentally friendly gas insulation includes a grounding switch housing 1. A stationary contact assembly and a moving contact assembly are respectively installed on opposite sides inside the grounding switch housing 1. The space between the stationary contact assembly and the moving contact assembly is the grounding switch gas chamber 2.

[0027] The stationary contact assembly includes a stationary contact base 3 mounted on the grounding switch housing 1 and a stationary arc contact 4 located within the stationary contact base 3.

[0028] The grounding switch housing 1 on the opposite side of the stationary contact assembly is provided with a moving contact assembly cavity. The grounding switch housing 1 and the crank arm box 5 are connected by bolts, so that the side of the moving contact assembly cavity away from the grounding switch air chamber is connected to the crank arm box cavity.

[0029] The moving contact assembly includes a moving contact 6, a piston 7, a pressure cylinder 8, and a contact finger seat 9. The outer wall of the moving contact 6 is fixedly connected to the piston 7 and slides together within the pressure cylinder 8, meaning that the moving contact 6 and the piston 7 move synchronously during the operation of the grounding switch. The pressure cylinder 8 is located within the cavity of the moving contact assembly, and the end of the pressure cylinder away from the grounding switch air chamber is connected to the contact finger seat 9. The contact finger seat 9 is bolted to the inner wall of the crank arm box. An internal gas channel 10 is axially formed inside the moving contact 6. An opening communicating with the internal gas channel 10 is formed on the first moving contact end near the stationary contact, while the second moving contact end away from the stationary contact is completely blocked. An internal contact finger seat 9 is axially formed within the contact finger seat. The finger seat has a through hole, and the second moving contact end passes through the finger seat through hole and extends into the crank arm box cavity; the moving contact 6, piston 7, pressure cylinder 8 and finger seat 9 together form a sealed pressure chamber 11, and the moving contact 6 in the pressure chamber 11 is provided with a moving contact vent hole 12 corresponding to the gas internal channel 10. That is to say, in this embodiment, the moving contact vent hole 12 on the moving contact 6 cooperates with the gas internal channel 10 to realize gas exchange between the pressure chamber and the grounding switch gas chamber; a plurality of pressure cylinder exhaust holes 13 are provided on the outer peripheral wall of the pressure cylinder near the grounding switch gas chamber, and a cylinder port for the first moving contact end to slide out is provided at the end of the pressure cylinder near the grounding switch gas chamber.

[0030] This embodiment presents a three-phase sub-box grounding switch based on environmentally friendly gas insulation. It adopts a structural design in which the moving contact "blows air" into the grounding switch gas chamber when the switch is open, and "draws air" from the grounding switch gas chamber when the switch is closed. Through the violent airflow disturbance, the arc temperature is quickly reduced and the plasma between the moving and stationary contacts is dispersed, thereby achieving the effect of quickly extinguishing the arc generated during the opening and closing of the grounding switch and greatly improving the opening and closing induced current capability of the grounding switch.

[0031] In a further specific embodiment, a first groove is provided on the outer periphery of the piston 7, and a first guide ring 14 for sealing the air chamber and guiding the movement of the moving contact is installed in the first groove.

[0032] Furthermore, several second grooves 15 are formed on the inner wall of the contact seat corresponding to the through hole of the contact seat. A portion of the second grooves 15 are fitted with spring contact fingers for current flow, while the remaining second grooves 15 are fitted with second guide rings for sealing the air chamber and guiding the movement of the moving contact.

[0033] In this embodiment, the air cylinder 8 and the finger seat 9 are connected as one piece by bolts. In addition, in practice, the air cylinder 8 and the finger seat 9 can also be machined as one piece.

[0034] In a further specific embodiment, a moving end shield 16 is also installed at the end of the air cylinder near the air chamber of the grounding switch. The moving end shield 16 can optimize the electric field distribution, protect the air cylinder components, and ensure the safe operation of the grounding switch.

[0035] Meanwhile, to ensure exhaust effect, a number of circular or elongated cylinder exhaust holes 13 can be opened on the outer peripheral wall of the compressor cylinder 8.

[0036] The moving contact vent 12 is located on the side of the piston near the contact finger seat. In this embodiment, the distance between the moving contact vent 12 and the piston 7 is 20mm~50mm.

[0037] In a further specific embodiment, the second moving contact end is connected to a drive rod 17 through an insulating connector. An operating mechanism assembly 18 is provided on the outside of the grounding switch housing 1. The drive head of the operating mechanism assembly 18 extends into the crank arm box cavity and is connected to the drive rod 17. The operating mechanism assembly 18 is used to drive the moving contact 6 to move closer to or away from the stationary arc contact 4.

[0038] Meanwhile, the finger seat 9 is connected to the grounding terminal 20 on the crank arm box 5 via the grounding busbar 19.

[0039] In this embodiment, after the grounding switch is closed, the central conductor of the GIS equipment is reliably grounded through components such as the stationary contact seat 3, moving contact 6, contact finger seat 9, grounding bus 19, and grounding terminal 20 in the grounding switch.

[0040] In a further specific embodiment, a gas external channel 21 connected to the grounding switch air chamber 2 is provided between the outer wall of the air cylinder and the inner wall of the corresponding grounding switch housing, and an airflow channel 22 connecting the crank arm box cavity and the gas external channel 21 is provided at the finger seat 9.

[0041] During the opening and closing of the grounding switch in this embodiment, the volume of the crank arm box cavity also changes due to the movement of the moving contact 6. In this embodiment, by setting an airflow channel 22 at the contact finger seat 9 to connect the crank arm box cavity with the grounding switch air chamber 2, the movement of the crank arm box cavity can be prevented from being hindered by the large change in air pressure.

[0042] The grounding switch operates as follows in this embodiment: 1. Under the breaking condition, that is, the process of the grounding switch performing the opening operation; In the initial stage of the grounding switch opening, the opening on the first moving contact end is blocked by the stationary arc contact 4. In the initial separation stage between the moving contact 6 and the stationary arc contact 4, the gas in the air chamber 11 is mainly exhausted through the air cylinder exhaust port 13, so as to achieve a smooth grounding switch opening process and reduce the operating force of the mechanism. After the moving contact 6 and the stationary arc contact 4 are separated, the piston 7 passes through the exhaust port 13 of the air cylinder, and the gas in the air chamber 11 is discharged at high speed through the moving contact vent 12 and the gas internal channel 10 to the grounding switch air chamber 2, so as to reduce the arc temperature and disperse the plasma between the moving and stationary arc contacts, thereby extinguishing the arc generated during the breaking process. 2. Under the closing condition, that is, the process of the grounding switch closing. In the initial closing stage of the grounding switch, the moving contact 6 and piston 7 move towards the stationary contact seat, increasing the volume of the compressed air chamber. The gas in the grounding switch air chamber 2 is drawn into the compressed air chamber 11 through the gas internal channel 10 and the moving contact vent 12. When the moving contact 6 contacts the stationary arc contact 4, the gas internal channel 10 in the moving contact 6 is blocked by the stationary arc contact 4. At this time, the compressed air cylinder exhaust port 13 has gradually opened with the movement of the moving contact, and the gas enters the compressed air chamber 11 through the compressed air cylinder exhaust port 13, thus preventing the compressed air chamber 11 and the grounding switch air chamber 2 from being hindered by an excessive pressure difference.

[0043] This embodiment also provides a GIS device, including one of the above-mentioned three-phase sub-enclosure grounding switches based on environmentally friendly gas insulation.

[0044] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0045] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A three-phase sub-enclosure grounding switch based on environmentally friendly gas insulation, characterized in that, The device includes a grounding switch housing, in which a stationary contact assembly and a moving contact assembly are respectively installed on opposite sides of the grounding switch housing, and a grounding switch air chamber is located between the stationary contact assembly and the moving contact assembly. The stationary contact assembly includes a stationary contact seat mounted on the grounding switch housing and a stationary arc contact located within the stationary contact seat; The grounding switch housing opposite the stationary contact assembly has a moving contact assembly cavity. The grounding switch housing is connected to the crank arm box, so that the side of the moving contact assembly cavity away from the grounding switch air chamber is connected to the crank arm box cavity. The moving contact assembly includes a moving contact, a piston, a pressure cylinder, and a contact finger seat. The outer wall of the moving contact is fixedly connected to the piston and slidably disposed in the pressure cylinder. The pressure cylinder is disposed in the moving contact assembly cavity, and the end of the pressure cylinder away from the grounding switch air chamber is connected to the contact finger seat. The contact finger seat is connected to the inner wall of the crank arm box. An internal gas channel is axially opened inside the moving contact, near the stationary contact. An opening for communicating with the internal gas passage is provided on the moving contact end, while the second moving contact end, which is away from the stationary contact end, is completely blocked; a contact seat through hole is provided axially inside the contact finger seat, and the second moving contact end passes through the contact finger seat through hole and extends into the crank arm box cavity; the moving contact, the piston, the pressure cylinder, and the contact finger seat together form a sealed pressure chamber, and the moving contact inside the pressure chamber is provided with a moving contact vent hole corresponding to communicating with the internal gas passage; a plurality of pressure cylinder exhaust holes are provided on the outer peripheral wall of the pressure cylinder on the side near the grounding switch gas chamber, and a cylinder port for the first moving contact end to slide out is provided at the end of the pressure cylinder near the grounding switch gas chamber.

2. A three-phase sub-enclosure grounding switch based on environmentally friendly gas insulation according to claim 1, characterized in that, The piston has a first groove on its outer periphery, and a first guide ring for sealing the pressure chamber and guiding the movement of the moving contact is installed in the first groove.

3. A three-phase sub-enclosure grounding switch based on environmentally friendly gas insulation according to claim 2, characterized in that, Several second grooves are formed on the inner wall of the contact seat corresponding to the through hole of the contact seat. A portion of the second grooves are fitted with spring contact fingers for current flow, and the remaining second grooves are fitted with second guide rings for sealing the air chamber and guiding the movement of the moving contact.

4. A three-phase sub-enclosure grounding switch based on environmentally friendly gas insulation according to claim 1, characterized in that, The air compressor and the finger seat are either integrally connected or connected by bolts.

5. A three-phase sub-enclosure grounding switch based on environmentally friendly gas insulation according to claim 1, characterized in that, The end of the air compressor near the grounding switch chamber is also equipped with a moving end shield; the outer peripheral wall of the air compressor is provided with a number of circular or elongated exhaust holes.

6. A three-phase sub-enclosure grounding switch based on environmentally friendly gas insulation according to claim 1, characterized in that, The distance between the vent hole of the moving contact and the piston is 20mm~50mm.

7. A three-phase sub-enclosure grounding switch based on environmentally friendly gas insulation according to claim 1, characterized in that, The second moving contact end is connected to a drive rod via an insulating connector. An operating mechanism assembly is provided on the outside of the grounding switch housing. The drive head of the operating mechanism assembly extends into the crank arm box cavity and is connected to the drive rod. The operating mechanism assembly is used to drive the moving contact to move closer to or away from the stationary arc contact.

8. A three-phase sub-enclosure grounding switch based on environmentally friendly gas insulation according to claim 1, characterized in that, The finger seat is connected to the grounding terminal on the crank arm box via a grounding busbar.

9. A three-phase sub-enclosure grounding switch based on environmentally friendly gas insulation according to claim 1, characterized in that, A gas external channel connected to the grounding switch air chamber is provided between the outer wall of the air compressor and the inner wall of the corresponding grounding switch housing. An airflow channel connecting the crank arm box cavity and the gas external channel is provided at the finger seat.

10. A GIS device, characterized in that, Includes a three-phase sub-box grounding switch based on environmentally friendly gas insulation as described in any one of claims 1-9.

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