A three-position integrated fixed pole of a circuit breaker and gas-filled cabinet
By casting the arc-extinguishing chamber, isolation contact, and grounding contact into a single unit, and by placing a shield between the isolation contact and the arc-extinguishing chamber, the electric field distribution is optimized, solving the insulation design problem in the three-position switch and improving the reliability and safety of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANJIN PINGGAO INTELLIGENT ELECTRIC
- Filing Date
- 2025-08-21
- Publication Date
- 2026-07-21
AI Technical Summary
The insulation design between the isolating contact and the vacuum interrupter in existing three-position switches has poor electric field distribution, which affects the reliability and safety of the equipment.
By casting the arc-extinguishing chamber, isolation contact, intermediate contact, and grounding contact into a single unit using insulating material, and by placing a shielding component between the isolation contact and the arc-extinguishing chamber, the electric field distribution at the grounding insert is optimized.
It significantly improves the electrical insulation performance of equipment, enhances operational reliability and safety, extends equipment service life, and reduces maintenance costs.
Smart Images
Figure CN224536954U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medium-voltage switchgear technology, and in particular to a three-position integrated solid-sealed pole and gas-filled cabinet for a circuit breaker. Background Technology
[0002] Three-position switches have three functions: closing, opening, and grounding, and are available in both direct-acting and rotary types. The gas-insulated switchgear uses vacuum circuit breakers and three-position switches as its main components, sealing them within a stainless steel welded gas chamber. It features safety, reliability, small footprint, and maintenance-free operation. The insulation design between the isolating contacts and the vacuum interrupter in the three-position switchgear is one of the key challenges, directly affecting the reliability and safety of the equipment.
[0003] Therefore, optimizing the electric field distribution and improving the electrical insulation performance of equipment to enhance its reliability and safety are technical problems that need to be solved by those skilled in the art. Utility Model Content
[0004] The purpose of this invention is to provide a three-position integrated solid-sealed pole and gas-filled switchgear for circuit breakers, which can optimize the electric field distribution at the grounding insert, significantly improve the electrical insulation performance of the equipment, thereby improving the operational reliability and safety of the equipment, extending the service life of the equipment, and reducing the maintenance cost of the equipment.
[0005] To achieve the above objectives, this utility model provides a three-position integrated solid-sealed pole for a circuit breaker, comprising a solid-sealed pole body, the solid-sealed pole body including an arc-extinguishing chamber and an isolating contact, an intermediate contact, and a grounding contact cast together with the arc-extinguishing chamber by means of insulating material. The isolating contact, the intermediate contact, and the grounding contact are spaced apart in a first direction, and the isolating contact and the arc-extinguishing chamber are spaced apart in a second direction perpendicular to the first direction. A grounding insert is provided between the isolating contact and the arc-extinguishing chamber, and the grounding insert is connected to a shielding member.
[0006] In one possible implementation, the shielding element includes:
[0007] The first plate is connected to the grounding insert;
[0008] The second plate is connected to the first plate, and the corner of the second plate away from the first plate is rounded.
[0009] In one possible implementation, a through hole is provided in the middle of the first plate, which is used for the top of the grounding insert to pass through, and for the casting of insulating material after the first plate and the grounding insert are connected.
[0010] In one possible implementation, there are two second plates, and the two second plates are respectively connected to the two ends of the first plate in the second direction, and the two second plates are perpendicular to the first plate.
[0011] In one possible implementation, the second plate and the first plate are smoothly connected.
[0012] In one possible implementation, the isolating contact is a hollow cylinder with an opening at the lower end, and the lower end of the isolating contact is provided with a first insulating wrapping layer that does not cover the opening.
[0013] In one possible implementation, the intermediate contact is a hollow cylinder with openings at both ends, and the two ends of the intermediate contact are provided with a second insulating wrapping layer that does not cover the openings.
[0014] In one possible implementation, the grounding contact is a hollow cylinder with an opening at the top, and the upper end of the grounding contact is provided with a third insulating wrapping layer that does not cover the opening.
[0015] In one possible implementation, the insulating material is an epoxy resin material.
[0016] Based on the above, this application also provides a gas-filled switchgear, including a chamber and a three-position integrated solid-sealed pole of a circuit breaker. The chamber is used to accommodate the solid-sealed pole body and is filled with nitrogen gas.
[0017] Compared with the prior art, the technical solution provided by this utility model has at least the following beneficial effects: the arc-extinguishing chamber, the isolating contact, the intermediate contact, and the grounding contact are cast into a whole by insulating material, so that the isolating contact, the intermediate contact, and the grounding contact are spaced apart in the first direction, ensuring that the relative positions of the isolating contact, the intermediate contact, and the grounding contact are accurate. By connecting the shielding component to the grounding insert between the isolating contact and the arc-extinguishing chamber, the electric field distribution at the grounding insert can be optimized, the electrical insulation performance of the equipment can be significantly improved, thereby improving the operational reliability and safety of the equipment, extending the service life of the equipment, and reducing the maintenance cost of the equipment. Attached Figure Description
[0018] 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.
[0019] Figure 1 This is a schematic diagram of the structure of the three-position integrated solid-sealed pole of the circuit breaker provided in this embodiment of the utility model;
[0020] Figure 2 This is a cross-sectional view of the structure of the three-position integrated solid-sealed pole of the circuit breaker provided in this embodiment of the utility model;
[0021] Figure 3This is a schematic diagram of the structure of the isolation contact provided in an embodiment of the present utility model;
[0022] Figure 4 This is a schematic diagram of the structure of the intermediate contact provided in an embodiment of the present utility model;
[0023] Figure 5 This is a schematic diagram of the structure of the grounding contact provided in an embodiment of the present utility model;
[0024] Figure 6 This is a schematic diagram of the connection between the grounding insert and the shielding component provided in an embodiment of the present utility model;
[0025] Figure 7 This is a schematic diagram of the structure of the movable slider provided in an embodiment of the present utility model;
[0026] Figure 8 This is a schematic diagram of the structure of the flexible connection provided in an embodiment of the present utility model;
[0027] Figure 9 This is a schematic diagram of the structure of the fixing insert provided in an embodiment of the present utility model;
[0028] Figure 10 This is a schematic diagram of the structure of the three-position integrated solid-sealed pole of the circuit breaker provided in this embodiment of the present invention from another perspective.
[0029] in:
[0030] 100 - Arc extinguishing chamber; 110 - Climbing distance plate;
[0031] 200 - Isolation contact; 210 - First insulating wrapping layer;
[0032] 300 - intermediate contact, 310 - second insulating wrapping layer;
[0033] 400 - Grounding contact; 410 - Third insulating wrapping layer;
[0034] 500-Grounding insert;
[0035] 600 - Shielding component, 610 - First plate, 620 - Second plate;
[0036] 700-Moving slider;
[0037] 800 - Soft connection;
[0038] 900 - Fixed insert. Detailed Implementation
[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0040] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0041] In the description of this utility model, it should be understood that the terms "upper" and "lower" 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 position 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 of this utility model.
[0042] The purpose of this utility model is to provide a three-position integrated solid-sealed pole and gas-filled switchgear for circuit breakers, which can optimize the electric field distribution at the grounding insert 500, significantly improve the electrical insulation performance of the equipment, thereby improving the operational reliability and safety of the equipment, extending the service life of the equipment, and reducing the maintenance cost of the equipment.
[0043] It should be noted that in this embodiment, the X direction in the attached figure is defined as the first direction, and the Y direction is defined as the second direction. The first direction and the second direction are perpendicular to each other.
[0044] Please see Figures 1 to 10 To achieve the above objectives, this utility model provides a three-position integrated solid-sealed pole for a circuit breaker, comprising a solid-sealed pole body. The solid-sealed pole body includes an arc-extinguishing chamber 100 and an isolating contact 200, an intermediate contact 300, and a grounding contact 400 cast together with the arc-extinguishing chamber 100 by means of insulating material. The isolating contact 200, the intermediate contact 300, and the grounding contact 400 are spaced apart in a first direction. Specifically, the isolating contact 200 is located above the intermediate contact 300 in the first direction and is spaced apart from the intermediate contact 300 in the first direction, and the grounding contact 400 is located below the intermediate contact 300 in the first direction and is spaced apart from the intermediate contact 300 in the first direction. The isolating contact 200 and the arc-extinguishing chamber 100 are spaced apart in a second direction perpendicular to the first direction. A grounding insert 500 is provided between the isolating contact 200 and the arc-extinguishing chamber 100, and the grounding insert 500 is connected to a shielding member 600.
[0045] The arc-extinguishing chamber 100, the isolating contact 200, the intermediate contact 300, and the grounding contact 400 are cast into a single unit using insulating material. This ensures that the isolating contact 200, the intermediate contact 300, and the grounding contact 400 are spaced apart in the first direction, guaranteeing accurate relative positions of the isolating contact 200, the intermediate contact 300, and the grounding contact 400. By connecting the shield 600 to the grounding insert 500 between the isolating contact 200 and the arc-extinguishing chamber 100, the electric field distribution at the grounding insert 500 can be optimized, significantly improving the electrical insulation performance of the equipment. This, in turn, enhances the operational reliability and safety of the equipment, extends its service life, and reduces maintenance costs.
[0046] It should be noted that after the shielding component 600 and the grounding insert 500 are connected, they are placed in the preset position of the mold, so that the shielding component 600 and the grounding insert 500 are integrally cast with the aforementioned arc-extinguishing chamber 100, isolating contact 200, intermediate contact 300, and grounding contact 400 by insulating material. The shielding component 600 and the grounding insert 500 are encased in insulating material. The arc-extinguishing chamber 100 is a vacuum arc-extinguishing chamber. Between the arc-extinguishing chamber 100 and the isolating contact 200, a creepage plate 110 is provided on the outer shell near the stationary end of the arc-extinguishing chamber 100 to increase the creepage distance. The creepage plate 110 is a semi-circular arc surface that extends above the upper part of the arc-extinguishing chamber 100. The solid-sealed pole body also includes a movable slider 700 and a flexible connection 800. The slider and the flexible connection 800 can be connected by a connector, and the movable slider 700 and the flexible connection 800 are located below the arc-extinguishing chamber 100 in the first direction. The solid-sealed pole body is also provided with a fixing insert, the fixing insert 900 and the grounding insert 500 are spaced apart in the second direction, and the fixing insert 900 is used to fix the solid-sealed pole body.
[0047] In one possible implementation, the insulating material is epoxy resin, and the grounding insert 500, isolating contact 200, intermediate contact 300, grounding contact 400, shielding component 600, and arc-extinguishing chamber 100 are cast together using an automated pressure gel molding technology for epoxy resin. The automated pressure gel molding technology for epoxy resin specifically includes three processes: pre-mixing, automated pressure gelling, and post-molding curing. The initial mixing process includes weighing, adding, and mixing raw materials; mold preparation includes mold installation, mold wiping, spraying release agent, and mold closing and heating; then pre-assembly is performed, using specific tooling to effectively maintain the relative positions of each part, while maintaining the tightness of each contact surface to prevent resin from squeezing into the contact surface and increasing the circuit resistance; mold assembly is then performed, after each component and insert is preheated, it is installed into the mold according to requirements, aligned and fixed in size, auxiliary tooling is removed, the mold is closed and kept warm to await material injection; then casting and mold opening are carried out; finally, inspection is carried out, including product size inspection, X-ray flaw detection, withstand voltage testing, partial discharge testing, lightning impulse testing, high and low temperature thermal cycling testing, and mechanical vibration testing.
[0048] In one possible implementation, the shielding member 600 includes a first plate 610 and a second plate 620. The first plate 610 is connected to the grounding insert 500; the second plate 620 is connected to the first plate 610, and the corner of the second plate 620 facing away from the first plate 610 is rounded. By rounding the corner of the second plate 620 facing away from the first plate 610, the phenomenon of electric field concentration can be effectively avoided.
[0049] In one possible implementation, the first plate 610 has a through hole in the middle, which is used for the top of the grounding insert 500 to pass through, and for the casting of insulating material after the first plate 610 and the grounding insert 500 are connected. The through hole not only helps to quickly connect the first plate 610 and the grounding insert 500, but also helps to position and align the first plate 610 relative to the grounding insert 500, thereby improving the assembly efficiency between the first plate 610 and the grounding insert 500.
[0050] In one possible implementation, the first plate 610 extends in the second direction, and there are two second plates 620, each connected to one end of the first plate 610 in the second direction. The two second plates 620 are perpendicular to the first plate 610. Using two second plates 620, compared to using one, effectively increases the overall surface area of the shield 600, dispersing the high electric field intensity originally concentrated near the grounding insert 500 to a larger surface area of the entire shield 600. This avoids the formation of excessively high local electric field strength points.
[0051] In one possible implementation, the second plate 620 and the first plate 610 are smoothly connected, which can effectively avoid the phenomenon of electric field concentration in the shield 600. The shield 600 can be set as an integral structure, formed by continuous bending of the plate to form the first plate 610 and two second plates 620 perpendicular to the first plate 610. The shield 600 is U-shaped, with a thickness of 2mm and a length, width and height of 85mm×64mm×50mm. The height direction is parallel to the first direction, the width direction is parallel to the second direction, and the length direction is perpendicular to the first and second directions. The length, width and height of the shield 600 can be adjusted according to actual needs. The four ends of the shield 600 are rounded. After being fitted onto the grounding insert 500 through the through hole, it is covered with epoxy resin.
[0052] In one possible implementation, the isolating contact 200 is a hollow cylinder with an opening at the lower end. The lower end of the isolating contact 200 is provided with a first insulating wrapping layer 210 that does not cover the opening. The first insulating wrapping layer 210 is formed by an insulating material protruding from the lower end face of the isolating contact 200, which can improve the isolation effect of the insulating material on the isolating contact 200.
[0053] In one possible implementation, the intermediate contact 300 is a hollow cylinder with openings at both ends, and the two ends of the intermediate contact 300 are provided with a second insulating wrapping layer 310 that does not cover the openings. The second insulating wrapping layer 310 is formed of insulating material protruding from the upper end face and the lower end face of the intermediate contact 300, which can improve the isolation effect of the insulating material on the intermediate contact 300.
[0054] In one possible implementation, the grounding contact 400 is a hollow cylinder with an open top, and the upper end of the grounding contact 400 is provided with a third insulating wrapping layer 410 that does not cover the opening. The third insulating wrapping layer 410 is formed of insulating material protruding from the upper end face of the grounding contact 400, which can improve the isolation effect of the insulating material on the grounding contact 400.
[0055] In this application, a shielding component 600 is added to the grounding insert 500 between the isolating contact 200 and the arc-extinguishing chamber 100, and an integrated solid-sealed pole for a 40.5kV environmentally friendly gas-insulated switchgear is formed by casting insulating material and other components. Simulation and experimental results show that the electric field strength originally concentrated in the grounding insert 500 is reduced, the electric field lines are more uniformly dispersed, and partial discharge initiation is avoided; the power frequency withstand voltage and lightning impulse withstand voltage are improved, and the partial discharge remains stable within a reasonable range; the overall resonant frequency and thermal field balance of the equipment are improved; and the reliability and lifespan of the equipment are improved. Through physical field reconstruction and material interface optimization, a synergistic improvement of "strong insulation-high reliability-long lifespan" in high-voltage electrical appliances is achieved, providing a key solution for environmentally friendly switchgear.
[0056] Based on the above, this application also provides a gas-filled switchgear, including a chamber and a three-position integrated solid-sealed terminal block of a circuit breaker. The chamber is used to accommodate the solid-sealed terminal block body and is filled with nitrogen. The gas-filled switchgear also has the beneficial effects of the aforementioned three-position integrated solid-sealed terminal block of a circuit breaker. The remaining structure of the gas-filled switchgear can refer to the prior art, and will not be described in detail here.
[0057] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.
[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0059] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.
Claims
1. A three-position integrated solid-sealed pole for a circuit breaker, characterized in that, The device includes a solid-sealed pole body, which includes an arc-extinguishing chamber (100) and an isolation contact (200), an intermediate contact (300), and a grounding contact (400) cast together with the arc-extinguishing chamber (100) by means of an insulating material. The isolation contact (200), the intermediate contact (300), and the grounding contact (400) are spaced apart in a first direction, and the isolation contact (200) and the arc-extinguishing chamber (100) are spaced apart in a second direction perpendicular to the first direction. A grounding insert (500) is provided between the isolation contact (200) and the arc-extinguishing chamber (100), and the grounding insert (500) is connected to a shield (600).
2. The three-position integrated solid-sealed pole of the circuit breaker according to claim 1, characterized in that, The shielding element (600) includes: The first plate (610) is connected to the grounding insert (500); The second plate (620) is connected to the first plate (610), and the corner of the second plate (620) away from the first plate (610) is rounded.
3. The three-position integrated solid-sealed pole of the circuit breaker according to claim 2, characterized in that, The first plate (610) has a through hole in the middle, which is used for the top of the grounding insert (500) to pass through, and for the casting of the insulating material after the first plate (610) and the grounding insert (500) are connected.
4. The three-position integrated solid-sealed pole of the circuit breaker according to claim 2, characterized in that, There are two second plates (620), and the two second plates (620) are respectively connected to the two ends of the first plate (610) in the second direction, and the two second plates (620) are perpendicular to the first plate (610).
5. The three-position integrated solid-sealed pole of the circuit breaker according to claim 2, characterized in that, The second plate (620) and the first plate (610) are smoothly connected.
6. The three-position integrated solid-sealed pole of the circuit breaker according to any one of claims 1-5, characterized in that, The isolating contact (200) is a hollow cylinder with an opening at the lower end, and the lower end of the isolating contact (200) is provided with a first insulating wrapping layer (210) that does not cover the opening.
7. The three-position integrated solid-sealed pole of the circuit breaker according to any one of claims 1-5, characterized in that, The intermediate contact (300) is a hollow cylinder with openings at both ends, and the two ends of the intermediate contact (300) are provided with a second insulating wrapping layer (310) that does not cover the openings.
8. The three-position integrated solid-sealed pole of the circuit breaker according to any one of claims 1-5, characterized in that, The grounding contact (400) is a hollow cylinder with an open top, and the upper end of the grounding contact (400) is provided with a third insulating wrapping layer (410) that does not cover the opening.
9. The three-position integrated solid-sealed pole of the circuit breaker according to any one of claims 1-5, characterized in that, The insulating material is epoxy resin.
10. An inflatable cabinet, characterized in that, It includes a chamber and a three-position integrated solid-sealed pole for a circuit breaker as described in any one of claims 1-9, wherein the chamber is used to accommodate the solid-sealed pole body and is filled with nitrogen gas.