Medium-voltage compact environment-friendly HGIS (hybrid gas insulated switchgear) composite combined electric appliance and use method thereof

Abstract

The invention relates to a medium-voltage compact type environment-friendly hybrid gas insulated switchgear (HGIS) combined type combined electric appliance and a using method, and the medium-voltage compact type environment-friendly HGIS combined type combined electric appliance comprises a single-phase circular shell, an arc extinguish chamber and two three-position switch assemblies, the three-position switch assembly comprises a three-position switch moving contact seat and a moving contact vertically connected in the three-position switch moving contact seat in a sliding mode, the upper end and the lower end of the single-phase circular shell are fixedly connected with an isolation contact seat and a grounding contact seat which are located in the vertical direction of the moving contact respectively, and the three-position switch assembly further comprises a transmission lead screw penetrating through the grounding contact seat. The transmission screw rod is in threaded connection with the moving contact; the static end of the arc extinguish chamber is fixedly connected with one of the three-position switch movable contact seats, the movable end of the arc extinguish chamber is fixedly connected with a conductive sliding block which is connected in the other three-position switch movable contact seat in a sliding mode, the outer side of the single-phase circular shell is fixedly connected with an operating mechanism, and a connecting rod of the operating mechanism is connected with the conductive sliding block through an insulating pull rod.

Description

Technical Field

[0001] The present invention relates to the technical field of switchgear, and in particular to a medium-voltage compact environmentally friendly HGIS composite combination electrical appliance and a use method thereof. Background Art

[0002] With growing environmental awareness and stricter global controls on greenhouse gas emissions, the gradual replacement of greenhouse gas (SF6) gas with eco-friendly equipment has become a key trend in the power industry. Research on environmentally friendly HGIS (Hybrid Electric Switchgear) hybrid switchgear is currently focused on two main areas: the use of new, environmentally friendly gases, such as C4 and other low-GWP gases, as switching and insulating gases. The other is vacuum switching and clean air insulation. This solution produces no decomposition products and has a GWP of zero for clean air, and is currently gaining acceptance in medium- and high-voltage equipment.

[0003] Conventional HGIS composite switchgear, such as patent number CN101989733B, is a composite high-voltage switchgear with functional configurations that meet main wiring requirements. It adopts a multi-segmented gas chamber structure design, with independent gas chambers for the circuit breaker and separate compartments for isolation and grounding combination switches.

[0004] For example, patent number CN203950732U is a composite combination electrical appliance that uses a circuit breaker with integrated isolation / grounding. The circuit breaker is an SF6 circuit breaker, and the isolation and grounding switch adopts a rotary structure.

[0005] For example, patent number CN119965721A is a vehicle-mounted semi-enclosed combination electrical appliance that uses an isolating switch and a grounding switch with independent gas chambers integrated above the horizontal circuit breaker, which is convenient for configuration according to needs. Its circuit breaker uses an SF6 circuit breaker.

[0006] In conjunction with the aforementioned patents, these typically utilize gas circuit breakers, which have numerous components and a complex structure. The increased insulation significantly increases costs, and the insulating materials generally degrade easily, causing secondary pollution and harming environmental protection. With the increasing demand for environmentally friendly and complex designs, a novel solution with a more compact structure, higher integration, less insulating material, and the ability to meet large-capacity design requirements is becoming a future trend. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the present invention provides a medium-voltage compact environmentally friendly HGIS composite combination electrical appliance and a method for using the same.

[0008] The present invention is achieved through the following technical solution, which provides a medium-voltage compact environmentally friendly HGIS composite combination electrical appliance, including a single-phase circular shell, an arc extinguishing chamber and two three-position switch assemblies. The single-phase circular shell is a horizontal cylindrical shape. The three-position switch assembly includes a three-position switch moving contact seat and a moving contact vertically sliding in the three-position switch moving contact seat. The upper and lower ends of the single-phase circular shell are respectively fixed with an isolation contact seat and a grounding contact seat located in the upper and lower directions of the moving contact. The three-position switch assembly also includes a transmission screw passing through the grounding contact seat, and the transmission screw is threadedly connected to the moving contact; the static end of the arc extinguishing chamber is fixed to one of the three-position switch moving contact seats, and the moving end of the arc extinguishing chamber is fixed to a conductive slider sliding in the other three-position switch moving contact seat. The outer side of the single-phase circular shell is fixed with an operating mechanism, and the connecting rod of the operating mechanism is connected to the conductive slider through an insulating pull rod.

[0009] In this solution, the arc extinguishing chamber is used to realize the opening and closing connection between the two three-position switch assemblies, and the three-position switch assembly is used to realize the state switching between opening and closing and earthing and closing, thereby integrating the horizontal circuit breaker, greatly reducing the number of shells and significantly reducing the vertical height.

[0010] As an optimization, the insulating rod and the conductive slider are connected via a connecting assembly. This connecting assembly includes axial connecting rods located on either side of the movable contact. The two ends of the axial connecting rods are connected by horizontal connecting rods. These horizontal connecting rods are fixed with screws, which are respectively fixed to the insulating rod and the conductive slider. In this solution, the connecting assembly connects the insulating rod and the conductive slider, ensuring the connection without affecting the raising and lowering movement of the movable contact, thus achieving perfect integration between the two.

[0011] As an optimization, sliding grooves are provided on both sides of the movable contact seat of the three-position switch, and the axial connecting rod is arranged in the sliding grooves. The sliding grooves provided in this solution are used to arrange the axial connecting rod.

[0012] As an optimization, the axis of the screw is coplanar with the axis of the moving contact.

[0013] As an optimization, the three-position switch moving contact seat is fixedly connected to the end of the single-phase circular housing via an insulator. The insulator is used to fix the three-position switch moving contact seat.

[0014] As an optimization, the operating mechanism is fixed to the end of the single-phase circular housing, and the insulating pull rod and the conductive slider are connected by a connecting assembly that passes through the three-position switch moving contact seat and the insulator. The operating mechanism in this solution drives the conductive slider through the connecting assembly.

[0015] As an optimization, the isolation contact seat and the grounding contact seat are respectively fixed on the flange openings at the upper and lower ends of the single-phase circular shell. In this solution, flange openings are set in the upper and lower directions of the circular shell to arrange the isolation contact seat and the grounding contact seat.

[0016] As an optimization, an enclosed current transformer is also included, connected to the upper end of the single-phase circular housing. The upper end of the enclosed current transformer is connected to a conductive plate via a bushing, and the lower end of the enclosed current transformer is connected to an isolation contact holder via a conductive rod. The conductive plate in this solution provides a connection to the outside world.

[0017] As an optimization, a vertical moving contact through hole is opened in the center of the three-position switch moving contact seat. The moving contact through hole provided in this solution sets the moving contact in the moving contact through hole, realizing its lifting and lowering in the center position of the three-position switch moving contact seat.

[0018] A method of using a medium-voltage compact environmentally friendly HGIS composite combination electrical appliance: When the three-position switch assembly is working, the moving contact is driven up and down by the rotation of the transmission screw. When the moving contact slides upward to dock with the isolation contact seat, the switch is closed. When the moving contact is located in the moving contact seat of the three-position switch and does not dock with the grounding contact seat and the isolation contact seat, the switch is opened. When the moving contact slides downward to dock with the grounding contact seat, the switch is closed to ground. The moving end and static end of the arc extinguishing chamber are respectively connected to the three-position switch moving contact seats of the two three-position switch assemblies. The connecting rod of the operating mechanism drives the conductive slider to move left and right through the insulating pull rod to realize the opening and closing of the arc extinguishing chamber, thereby realizing the opening and closing operation between the two three-position switch assemblies.

[0019] The beneficial effects of the present invention are as follows: a medium-voltage compact environmentally friendly HGIS composite combination electrical appliance and a method of use of the present invention, through an integrated horizontal circuit breaker, greatly reduces the number of shells and greatly reduces the vertical height direction, innovatively designs an integrated three-position switch structure, does not require additional insulation support, and can achieve large current flow and more uniform electric field distribution. The structure fully and rationally utilizes space, uses very little insulation material, has a simple structure, and can achieve a compact environmentally friendly HGIS composite combination electrical appliance with large current flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the internal structure of the present invention; Figure 2 This is a structural schematic diagram of the connection assembly of the present invention in an installed state; Figure 3 A front view of the connection assembly of the present invention in an installed state; Figure 4 For the present invention Figure 3 BB surface cross-sectional view in; Figure 5For the present invention Figure 3 AA section view in the figure; Figure 6 Schematic diagram of the structure of the connection assembly of the present invention; As shown in the figure: 1. Single-phase circular housing, 2. First insulator, 3. Three-position switch moving contact seat, 4. Arc extinguishing chamber, 5. Conductive slider, 6. Connecting assembly, 61. Axial connecting rod, 62. Screw, 63. Horizontal connecting rod, 8. Second insulator, 9. Insulating pull rod, 10. Connecting rod, 11. Operating mechanism, 12. Operating mechanism housing, 13. Grounding contact seat, 14. Transmission screw, 15. Moving contact, 16. Isolating contact seat, 17. Conductive rod, 18. Enclosed current transformer, 19. Bushing, 20. Conductive plate, 21. Moving contact through hole. DETAILED DESCRIPTION

[0021] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0022] like Figures 1 to 6 As shown, a medium-voltage compact environmentally friendly HGIS composite switchgear of the present invention comprises a single-phase circular housing 1, an arc extinguishing chamber 4 and two three-position switch assemblies.

[0023] The single-phase circular shell 1 is a horizontal cylindrical sealed structure filled with environmentally friendly gas. The two horizontal ends are closed by flanges. Two flange openings are set at the upper and lower ends of the single-phase circular shell 1, and the upper and lower openings are coaxial.

[0024] The three-position switch assembly includes a three-position switch moving contact seat 3 and a moving contact 15 vertically slidingly connected in the three-position switch moving contact seat 3. The two three-position switch moving contact seats 3 are arranged along the length direction inside the single-phase circular shell 1 and are respectively located between the upper and lower openings of the flange opening.

[0025] The three-position switch moving contact seat 3 is fixed to the end of the single-phase circular housing 1 through an insulator. The insulator is fixed to the flange at the end of the single-phase circular housing 1 by bolts. The insulator has a conical hollow structure. The three-position switch moving contact seat 3 is fixed on the end with a smaller cross-section of the insulator. Figure 1 As shown, the three-position switch movable contact seat 3 on the left is supported and fixed by the first insulator 2 , and the three-position switch movable contact seat 3 on the right is supported and fixed by the second insulator 8 .

[0026] like Figure 2 As shown, the three-position switch moving contact seat 3 is a cross structure. The three-position switch moving contact seat 3 is multifunctional. It is not only the moving contact seat of the three-position switch assembly, but also serves as the static and moving end support of the arc extinguishing chamber of the vacuum circuit breaker.

[0027] The three-position switch's movable contact base 3 has a vertical movable contact hole 21 at its center. The movable contact 15 is a vertical, elongated strip located within the hole 21, enabling it to rise and fall. The upper and lower ends of the single-phase circular housing 1 are respectively secured with an isolation contact base 16 and a grounding contact base 13, located above and below the movable contact 15. The isolation contact base 16 and the grounding contact base 13 are secured to flanges at the upper and lower ends of the single-phase circular housing 1. The lower end surface of the isolation contact seat 16 and the upper end surface of the grounding contact seat 13 are both provided with grooves to facilitate the insertion of the moving contact 15. When the moving contact 15 is located in the moving contact seat 3 of the three-position switch, it has no contact with the isolation contact seat 16 and the grounding contact seat 13, and the three-position switch assembly is in the open state; after the moving contact 15 moves upward and is inserted into the groove of the isolation contact seat 16, the isolation contact seat 16 and the moving contact seat 3 of the three-position switch are connected to achieve closing; after the moving contact 15 moves downward and is inserted into the groove of the grounding contact seat 13, the grounding contact seat 13 and the moving contact seat 3 of the three-position switch are connected to achieve grounding closing.

[0028] In order to realize the lifting and lowering action of the moving contact 15, the three-position switch assembly also includes a transmission screw 14 passing through the grounding contact seat 13. The transmission screw 14 is threadedly connected to the moving contact 15, and the lower end passes through the flange opening of the grounding contact seat 13 to facilitate the rotation of the transmission screw 14.

[0029] It also includes an enclosed current transformer 18 connected to the upper end of the outside of the single-phase circular housing 1. The upper end of the enclosed current transformer 18 is connected to a conductive plate 20 through a bushing 19 to achieve connection with the outside world. The lower end of the enclosed current transformer 18 is connected to the isolation contact seat 16 through a conductive rod 17.

[0030] An arc extinguishing chamber 4 is connected between the two three-position switch movable contact bases 3. The static end of the arc extinguishing chamber 4 is fixedly connected to one of the three-position switch movable contact bases 3, thereby supporting and fixing the static end of the arc extinguishing chamber 4. The movable end of the arc extinguishing chamber 4 is fixedly connected to a conductive slider 5 that slides inside the other three-position switch movable contact base 3. The conductive slider 5 is cylindrical and slides within the axial hole of the other three-position switch movable contact base 3. The conductive slider 5 and the axial hole of the three-position switch movable contact base 3 are connected by a conductive spring to enable the passage of current.

[0031] An operating mechanism 11 is fixedly attached to the outside of the single-phase circular housing 1. The connecting rod 10 of the operating mechanism 11 is connected to the conductive slider 5 via an insulating pull rod 9. In this embodiment, the operating mechanism 11 is fixed to the end of the single-phase circular housing 1. The insulating pull rod 9 and the conductive slider 5 are connected by a connecting assembly 6 that passes through the three-position switch movable contact seat 3 and the insulator.

[0032] like Figure 2-6As shown, the connecting assembly 6 includes axial connecting rods 61 located on both sides of the moving contact 15. In this embodiment, sliding grooves are opened on both sides of the moving contact seat 3 of the three-position switch, and the axial connecting rods 61 are arranged in the sliding grooves.

[0033] The two ends of the two axial connecting rods 61 are connected by horizontal connecting rods 63. The horizontal connecting rods 63 are fixed with screw rods 62. The two screw rods 62 are coaxially arranged, and the axes of the screw rods 62 are coplanar with the axis of the movable contact 15. The two screw rods 62 are fixed to the insulating pull rod 9 and the conductive slider 5 respectively.

[0034] A method of using a medium-voltage compact environmentally friendly HGIS composite combination electrical appliance: When the three-position switch assembly is working, the moving contact 15 is driven up and down by the rotation of the transmission screw 14. When the moving contact 15 slides upward to dock with the isolation contact seat 16, the switch is closed. When the moving contact 15 is located in the moving contact seat 3 of the three-position switch and does not dock with the grounding contact seat 13 and the isolation contact seat 16, the switch is opened. When the moving contact 15 slides downward to dock with the grounding contact seat 13, the switch is closed to ground. The moving end and the static end of the arc extinguishing chamber 4 are respectively connected to the three-position switch moving contact seats 3 of the two three-position switch assemblies. The connecting rod 10 of the operating mechanism 10 drives the conductive slider 5 to move left and right through the insulating pull rod 9 to realize the opening and closing of the arc extinguishing chamber 4, thereby realizing the opening and closing operation between the two three-position switch assemblies.

[0035] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by adopting existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical solutions of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A medium-voltage compact environmentally friendly HGIS composite switchgear, characterized by: The invention comprises a single-phase circular shell (1), an arc extinguishing chamber (4) and two three-position switch assemblies, wherein the single-phase circular shell (1) is a horizontal cylindrical shape, the three-position switch assembly comprises a three-position switch movable contact seat (3) and a movable contact (15) vertically slidingly connected in the three-position switch movable contact seat (3), the upper and lower ends of the single-phase circular shell (1) are respectively fixed with an isolation contact seat (16) and a grounding contact seat (13) located in the upper and lower directions of the movable contact (15), and the three-position switch assembly further comprises a grounding contact seat passing through the grounding contact seat. (13), the transmission screw (14) is threadedly connected to the moving contact (15); the static end of the arc extinguishing chamber (4) is fixedly connected to one of the three-position switch moving contact seats (3), the moving end of the arc extinguishing chamber (4) is fixedly connected to a conductive slider (5) slidingly connected to the other three-position switch moving contact seat (3), the outer side of the single-phase circular shell (1) is fixedly connected to an operating mechanism (11), and the connecting rod (10) of the operating mechanism (11) is connected to the conductive slider (5) through an insulating pull rod (9).

2. The medium-voltage compact environmentally friendly HGIS composite switchgear according to claim 1, characterized in that: The insulating pull rod (9) and the conductive slider (5) are connected via a connecting assembly (6), wherein the connecting assembly (6) comprises axial connecting rods (61) located on both sides of the moving contact (15), and the two ends of the two axial connecting rods (61) are connected via horizontal connecting rods (63), wherein screw rods (62) are fixedly connected to the horizontal connecting rods (63), and the two screw rods (62) are fixedly connected to the insulating pull rod (9) and the conductive slider (5), respectively.

3. The medium-voltage compact environmentally friendly HGIS composite switchgear according to claim 2, characterized in that: Sliding grooves are provided on both sides of the three-position switch movable contact seat (3), and the axial connecting rod (61) is arranged in the sliding grooves.

4. The medium-voltage compact environmentally friendly HGIS composite switchgear according to claim 2, characterized in that: The axis of the screw (62) is coplanar with the axis of the moving contact (15).

5. The medium-voltage compact environmentally friendly HGIS composite switchgear according to claim 1, characterized in that: The three-position switch moving contact seat (3) is fixedly connected to the end of the single-phase circular housing (1) via an insulator.

6. The medium-voltage compact environmentally friendly HGIS composite switchgear according to claim 5, characterized in that: The operating mechanism (11) is fixed to the end of the single-phase circular housing (1), and the insulating pull rod (9) and the conductive slider (5) are connected by passing through the three-position switch moving contact seat (3) and the connecting component (6) of the insulator.

7. The medium-voltage compact environmentally friendly HGIS composite switchgear according to claim 1, characterized in that: The isolation contact seat (16) and the grounding contact seat (13) are respectively fixed to the flange openings at the upper and lower ends of the single-phase circular housing (1).

8. The medium-voltage compact environmentally friendly HGIS composite switchgear according to claim 1, characterized in that: It also includes a closed current transformer (18) connected to the upper end of the outer portion of the single-phase circular housing (1), wherein the upper end of the closed current transformer (18) is connected to a conductive plate (20) via a bushing (19), and the lower end of the closed current transformer (18) is connected to an isolation contact seat (16) via a conductive rod (17).

9. The medium-voltage compact environmentally friendly HGIS composite switchgear according to claim 1, characterized in that: A vertical moving contact through hole (21) is provided at the center of the three-position switch moving contact seat (3).

10. A method for using the medium-voltage compact environmentally friendly HGIS composite switchgear according to any one of claims 1 to 9, characterized in that: When the three-position switch assembly is working, the moving contact (15) is driven up and down by the rotation of the transmission screw (14). When the moving contact (15) slides upward to dock with the isolation contact seat (16), the switch is closed. When the moving contact (15) is located in the three-position switch moving contact seat (3) and is not docked with the grounding contact seat (13) and the isolation contact seat (16), the switch is opened. When the moving contact (15) slides downward to dock with the grounding contact seat (13), the grounding closing is achieved. The moving end and the static end of the arc extinguishing chamber (4) are respectively connected to the three-position switch moving contact seats (3) of the two three-position switch assemblies. The connecting rod (10) of the operating mechanism (10) drives the conductive slider (5) to move left and right through the insulating pull rod (9), thereby realizing the opening and closing of the arc extinguishing chamber (4), thereby realizing the opening and closing operation between the two three-position switch assemblies.

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