Environment-friendly gas circuit breaker with voltage-sharing cover

Abstract

The utility model relates to the technical field of circuit breakers, and discloses an environment-friendly gas circuit breaker with a grading shield, which comprises a vacuum arc-extinguishing chamber frame, a vacuum arc-extinguishing chamber is arranged at the rear end in the vacuum arc-extinguishing chamber frame, a conductive seat is mounted on the rear side in the vacuum arc-extinguishing chamber frame, and the conductive seat is connected to the rear end of the vacuum arc-extinguishing chamber; a fixing assembly is arranged in the middle in the vacuum arc-extinguishing chamber frame, a movable end fixing seat is arranged at the front end of the fixing assembly, the fixing assembly is fixedly connected with the upper portion of the vacuum arc-extinguishing chamber, a movable end conductor is arranged at the front end of the vacuum arc-extinguishing chamber, and a flexible connection conductor is in contact connection with the upper end of the movable end conductor and fixed through the movable end fixing seat. The upper end of the flexible connection conductor is in contact connection with a leading-out copper rod, and a voltage-sharing cover is arranged above the flexible connection conductor and the leading-out copper rod. The utility model effectively solves the problems of the existing environment-friendly gas ring main unit circuit breaker, has the advantages of excellent insulation performance, good heat dissipation effect, stable and reliable structure and the like, and is suitable for a 12kV environment-friendly gas insulation circuit breaker cabinet.

Description

Technical Field

[0001] This utility model relates to the field of circuit breakers, specifically an environmentally friendly gas circuit breaker with an equalizing cover. Background Technology

[0002] In the power equipment sector, SF6 gas is widely used in ring main units (RMS) due to its superior insulation and arc-quenching properties. Under the same pressure conditions, SF6's electrical insulation capacity is 2-3 times that of air, and its arc-quenching capacity is 100 times that of air. Based on these excellent properties, SF6 RMS units can achieve a smaller size design under the same conditions, meeting the power system's requirements for compact equipment and efficient space utilization. However, the application of SF6 gas has significant drawbacks. As a strong greenhouse gas, its global warming potential (GWP) is as high as 23,500 times that of carbon dioxide (CO2), severely exacerbating global warming. Simultaneously, during the operation of switchgear, SF6 gas decomposes under the influence of an electric arc, producing corrosive and toxic products such as hydrofluoric acid and sulfuryl fluoride, posing a threat to equipment and personnel safety. With the advancement of global carbon emission reduction targets, the application of SF6 gas is facing increasingly stringent restrictions, and the use of fluorine-free, environmentally friendly gases as the insulating medium for RMS units has become an important development trend in the power equipment sector.

[0003] Currently, according to the State Grid's 12kV standardization regulations, the size difference between environmentally friendly gas ring main units and SF6 gas ring main units is minimal, leading many manufacturers to directly adopt the layout design of SF6 gas ring main units for environmentally friendly gas ring main units. However, this practice has caused serious insulation problems, and existing solutions to these problems have many shortcomings. Firstly, adding insulating partitions made of SMC or DMC unsaturated polyester laminates where the insulation distance is insufficient can significantly impact equipment performance under prolonged high-voltage operation due to the electrical energy absorption characteristics of the insulating partition material, and also poses a risk of insulation aging. Secondly, using heat-shrink tubing to cover live parts to improve insulation strength, while suppressing surface electric field strength, is detrimental to heat dissipation. Furthermore, the heat-shrink tubing easily attracts dust after shrinking and lacks fire resistance; in the event of an electrical fire, it may actually accelerate the spread of the fire and exacerbate the damage.

[0004] Therefore, it is urgent to abandon the traditional 12kV SF6 gas ring main unit structure and redesign the circuit breaker of the environmentally friendly gas ring main unit to solve the problems of poor insulation performance and major safety hazards of the existing circuit breaker. Utility Model Content

[0005] The purpose of this invention is to provide an environmentally friendly gas circuit breaker with an equalizing cover. Utilizing an equalizing cover design, the vacuum interrupter frame features a skirted design, resulting in a compact structure and convenient installation. Employing a one-piece molding process, it boasts high stability and high molding efficiency, significantly reducing the number of components. This circuit breaker can replace SF6 gas circuit breakers, thus solving the problems mentioned in the background section.

[0006] The technical solution of this utility model is: an environmentally friendly gas circuit breaker with an equalizing cover, comprising a vacuum interrupter frame, a vacuum interrupter chamber is provided at the rear end of the vacuum interrupter frame, a conductive base is installed on the rear side of the vacuum interrupter frame, the conductive base is connected to the rear end of the vacuum interrupter chamber; a fixing component is provided in the middle of the vacuum interrupter frame, a moving end fixing base is provided at the front end of the fixing component, the fixing component is fixedly connected to the upper part of the vacuum interrupter chamber, a moving end conductor is provided at the front end of the vacuum interrupter chamber, a flexible connecting conductor is contacted and connected at the upper end of the moving end conductor, the flexible connecting conductor is fixed by the moving end fixing base, a lead-out copper rod is contacted and connected at the upper end of the flexible connecting conductor, and an equalizing cover is provided above the flexible connecting conductor and the lead-out copper rod.

[0007] Furthermore, the fixing assembly includes a ring bracket, bolts, and nuts, all of which are made of insulating material.

[0008] Furthermore, the upper end of the vacuum interrupter frame is provided with a material-saving cavity, and the lower end is a hollow structure, which optimizes the internal space layout, forms an efficient heat dissipation channel, effectively solves the heat generation problem caused by current, and plays a good heat dissipation role.

[0009] Furthermore, the outer surface of the equalizing shield has an arc-shaped profile.

[0010] Furthermore, the equalizing cover is provided with a screw cavity and a screw, the height of the screw being less than the depth of the screw cavity, so as to ensure that the screw will not exceed the surface of the equalizing cover after it is installed in the screw cavity.

[0011] Furthermore, an upper umbrella skirt is provided at the upper end of the vacuum interrupter frame.

[0012] Furthermore, the rear end of the vacuum interrupter frame is sequentially provided with an insert nut skirt, a support spacer skirt, and a conductive seat skirt. By increasing the skirt structure, the creepage distance is effectively increased, thereby improving the insulation reliability of the circuit breaker in complex environments.

[0013] Furthermore, the rear end of the vacuum interrupter frame is provided with an insert nut and a support spacer, thereby firmly fixing the vacuum interrupter to the conductive base and the vacuum interrupter frame.

[0014] This utility model provides an environmentally friendly gas circuit breaker with an equalizing cover, which has the following improvements and advantages compared with the prior art:

[0015] 1. The vacuum interrupter frame of this utility model is provided with a material-saving cavity at the upper end and a hollow structure at the lower end, which optimizes the internal space layout and forms an efficient heat dissipation channel, effectively solving the problem of heat generation caused by current. At the same time, the setting of the support sleeve can effectively resist the torque during the installation of the vacuum interrupter, prevent the vacuum interrupter frame from deforming or cracking, and enhance the overall structural strength and stability of the equipment.

[0016] 2. This utility model features an equalizing shield positioned above the flexible connector conductor and the lead-out copper rod. The equalizing shield has a specially structured screw cavity, with the screw height less than the cavity depth, ensuring a flat surface after screw installation and preventing electric field distortion caused by protrusions. The outer surface of the equalizing shield has an arc-shaped profile, effectively shielding the charged tips of the flexible connector conductor and the lead-out copper rod, resulting in a uniform electric field distribution and reduced local electric field intensity. Simultaneously, its large outer surface provides excellent heat dissipation, effectively mitigating heat generation at the connection point between the flexible connector conductor and the lead-out copper rod due to resistance, thus ensuring the stability of equipment operation.

[0017] 3. This utility model has an upper umbrella skirt at the upper end of the vacuum interrupter frame, and an insert nut umbrella skirt, a support spacer umbrella skirt, and a conductive seat umbrella skirt are arranged sequentially at the rear end. By increasing the umbrella skirt structure, the creepage distance is significantly increased, and the insulation reliability of the circuit breaker in complex environments is improved.

[0018] In summary, this utility model, through innovative design and reasonable layout of the structure of each component, eliminates the need for insulating partitions, heat shrink tubing, or other methods to increase insulation, effectively solving the problems existing in current environmentally friendly gas-insulated circuit breakers. It has advantages such as excellent insulation performance, good heat dissipation, and stable and reliable structure, and is suitable for 12kV environmentally friendly gas-insulated circuit breaker cabinets. Attached Figure Description

[0019] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 yes Figure 1 Front view sectional structural diagram;

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Vacuum interrupter frame; 2. Lead-out copper rod; 3. Screw cavity; 4. Screw; 5. Equalizing cover; 6. Upper end skirt; 7. Material-saving cavity; 8. Insert nut skirt; 9. Supporting spacer skirt; 10. Conductor seat skirt; 11. Flexible connector conductor; 12. Moving end conductor; 13. Moving end fixing seat; 15. Bolt; 16. Circular ring bracket; 17. Vacuum interrupter; 18. Conductor seat; 19. Insert nut; 20. Supporting spacer. Detailed Implementation

[0024] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0025] This utility model provides an improved environmentally friendly gas circuit breaker with a pressure equalization cover. The technical solution of this utility model is as follows:

[0026] like Figures 1-2 As shown, an environmentally friendly gas circuit breaker with an equalizing cover includes a vacuum interrupter frame 1. A vacuum interrupter 17 is disposed at the rear end of the vacuum interrupter frame 1. A conductive base 18 is installed on the rear side of the vacuum interrupter frame 1 and connected to the rear end of the vacuum interrupter 17. A fixing component is disposed in the middle of the vacuum interrupter frame 1. A moving end fixing base 13 is disposed at the front end of the fixing component. The fixing component is fixedly connected to the upper part of the vacuum interrupter 17. A moving end conductor 12 is disposed at the front end of the vacuum interrupter 17. A flexible connecting conductor 11 is contacted and connected to the upper end of the moving end conductor 12. The flexible connecting conductor 11 is fixed by the moving end fixing base 13. A lead-out copper rod 2 is contacted and connected to the upper end of the flexible connecting conductor 11. An equalizing cover 5 is disposed above the flexible connecting conductor 11 and the lead-out copper rod 2.

[0027] The fixing components include a ring bracket 16, a bolt 15, and a nut 14, all of which are made of insulating material.

[0028] The upper end of the vacuum interrupter frame 1 is provided with a material-saving cavity 7, and the lower end is a hollow structure. This optimizes the internal space layout, forms an efficient heat dissipation channel, effectively solves the heat generation problem caused by current, and plays a good heat dissipation role.

[0029] The outer surface of the equalizing cover 5 has an arc-shaped profile.

[0030] The equalizing cover 5 is provided with a screw cavity 3 and a screw 4. The height of the screw 4 is less than the depth of the screw cavity 3 to ensure that the screw 4 will not exceed the surface of the equalizing cover 5 after it is installed in the screw cavity 3.

[0031] The upper end of the vacuum interrupter frame 1 is provided with an upper umbrella skirt 6.

[0032] The rear end of the vacuum interrupter frame 1 is provided with insert nut skirt 8, support spacer skirt 9 and conductive seat skirt 10 in sequence. By adding the skirt structure, the creepage distance is effectively increased, and the insulation reliability of the circuit breaker in complex environments is improved.

[0033] The rear end of the vacuum interrupter frame 1 is provided with an insert nut 19 and a support spacer 20, thereby firmly fixing the vacuum interrupter 17 to the conductive base 18 and the vacuum interrupter frame 1.

[0034] To verify the effectiveness of the principle described in this invention, samples of the vacuum interrupter frame 1, equalizing cover 5, and circular bracket 16 were made by molding and finally assembled into an environmentally friendly gas circuit breaker sample. The sample was sent to a third-party testing institution, Xi'an High Voltage Apparatus Research Institute Changzhou Co., Ltd. (XIHARI), for verification.

[0035] A complete set of type tests were conducted according to GB / T 3906-2020, DL / T 404-2018, GB / T 1984-2014, and DL / T 402-2016 standards. The power frequency withstand voltage test, lightning impulse withstand voltage test, and partial discharge measurement were used to verify the insulation reliability of the circuit breaker; the short-time withstand current and peak withstand current tests were used to verify the mechanical strength of the circuit breaker; the internal arc test was used to verify the flame retardant performance of the circuit breaker; the temperature rise test was used to verify the heat dissipation performance of the circuit breaker; and the mechanical test was used to verify the lifespan of the circuit breaker. The insulation, lifespan, flame retardant, and heat dissipation verifications of the verification structure all passed.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly gas circuit breaker with a grading shield, characterized by: The system includes a vacuum interrupter frame (1), a vacuum interrupter (17) is provided at the rear end of the vacuum interrupter frame (1), a conductive seat (18) is installed on the rear side of the vacuum interrupter frame (1), and the conductive seat (18) is connected to the rear end of the vacuum interrupter (17); a fixing component is provided in the middle of the vacuum interrupter frame (1), a moving end fixing seat (13) is provided at the front end of the fixing component, the fixing component is fixedly connected to the upper part of the vacuum interrupter (17), a moving end conductor (12) is provided at the front end of the vacuum interrupter (17), a flexible connecting conductor (11) is contacted at the upper end of the moving end conductor (12), the flexible connecting conductor (11) is fixed by the moving end fixing seat (13), a lead-out copper rod (2) is contacted at the upper end of the flexible connecting conductor (11) and the lead-out copper rod (2), and an equalizing cover (5) is provided above the flexible connecting conductor (11) and the lead-out copper rod (2).

2. The environmentally friendly gas circuit breaker with grading shield according to claim 1, characterized in that: The fixing assembly includes a ring bracket (16), a bolt (15), and a nut (14), all of which are made of insulating material.

3. The environmentally friendly gas circuit breaker with grading shield according to claim 2, characterized in that: The upper end of the vacuum interrupter frame (1) is provided with a material-saving cavity (7), and the lower end is a hollow structure.

4. The environmentally friendly gas circuit breaker with grading shield of claim 1, wherein: The outer surface of the equalizing shield (5) has an arc-shaped profile.

5. The environmentally friendly gas circuit breaker with grading shield according to claim 4, characterized in that: The equalizing cover (5) is provided with a screw cavity (3) and a screw (4). The height of the screw (4) is less than the depth of the screw cavity (3) to ensure that the screw (4) will not exceed the surface of the equalizing cover (5) after it is installed in the screw cavity (3).

6. The environmentally friendly gas circuit breaker with grading shield of claim 1, wherein: The upper end of the vacuum interrupter frame (1) is provided with an upper umbrella skirt (6).

7. The environmentally friendly gas circuit breaker with grading shield of claim 6, wherein: The rear end of the vacuum interrupter frame (1) is provided with insert nut skirt (8), support spacer skirt (9) and conductive seat skirt (10) in sequence.

8. The environmentally friendly gas circuit breaker with a grading shield according to claim 1, characterized in that: The rear end of the vacuum interrupter frame (1) is provided with an insert nut (19) and a support spacer (20), thereby firmly fixing the vacuum interrupter (17) to the conductive base (18) and the vacuum interrupter frame (1).

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