252kV / 63kA pneumatic GIS circuit breaker structure

Abstract

The utility model provides a 252kV / 63kA pneumatic GIS circuit breaker structure, which comprises a middle contact seat, a moving contact assembly, a static contact assembly and a piston seat, one end of the moving contact assembly far away from the static contact assembly penetrates through the piston seat and then is connected with a spring operating mechanism through an insulating pull rod, the piston seat is provided with a piston head, and the piston head is connected with the static contact assembly through an insulating pull rod. The moving contact assembly comprises a nozzle, a cylinder and a rod fixed in the cylinder, the outer wall of the cylinder is in contact with the middle contact seat, the inner wall of the cylinder is in contact with the piston head, an expansion chamber is formed above the piston head, the piston head is provided with an air hole penetrating in the axial direction of the piston head and an annular valve plate, and when the valve plate is in contact with the top face of the piston head, the valve plate is in contact with the top face of the piston head. The beneficial effects of the utility model lie in that the durability and reliability of the circuit breaker are improved.

Description

Technical Field

[0001] This utility model relates to the field of power engineering technology, and in particular to a structure of a 252kV / 63kA air-cooled GIS circuit breaker. Background Technology

[0002] With the continued growth of the global economy, power systems are facing unprecedented challenges, especially the 220kV power grid system, whose capacity is constantly increasing, making it a crucial component of modern power networks. However, this development trend has also brought new problems, namely a significantly increased risk of excessive short-circuit current, posing a significant threat to the stable operation of the power grid. Excessive short-circuit current can not only damage equipment but also trigger large-scale power outages, severely impacting social production and people's lives.

[0003] To address this challenge, existing technologies commonly employ compressed air GIS circuit breakers, whose core structure includes a piston head, valve plate, and vent design. Specifically, existing circuit breakers have a positioning bolt running through the vent of the piston head. The valve plate opens or closes the vent by sliding along the axial direction of the positioning bolt. During the tripping process, the valve plate moves along the positioning bolt under the action of air pressure and mechanical driving force to block or open the vent, thereby controlling the flow of gas in the expansion chamber.

[0004] However, the above-mentioned prior art has at least the following drawbacks: the setting of the positioning bolt will result in the internal space of the piston head air hole being restricted, and the valve plate is prone to friction with the positioning bolt during the sliding process, which not only increases the action resistance, but may also cause the valve plate to deviate or get stuck, making it difficult to meet the requirements of modern power grids for high reliability and durability. Utility Model Content

[0005] This application provides a 252kV / 63kA air-cooled GIS circuit breaker structure, aiming to address the shortcomings of existing technologies, improve the durability and reliability of circuit breakers, and provide strong support for the stable operation of power systems.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a 252kV / 63kA air-operated GIS circuit breaker structure, including an intermediate contact base, a moving contact assembly, a stationary contact assembly, and a piston seat. The end of the moving contact assembly furthest from the stationary contact assembly passes through the piston seat and is connected to a spring operating mechanism via an insulating pull rod. A piston head is provided on the piston seat. The moving contact assembly includes a nozzle, a cylinder, and a rod fixed inside the cylinder. The outer wall of the cylinder contacts the intermediate contact base, and the inner wall of the cylinder contacts the piston head, forming an expansion chamber above the piston head. The piston head has an axially penetrating air hole and an annular valve plate. When the valve plate contacts the top surface of the piston head, the air hole of the piston head can be blocked. The gravity-type valve plate structure adopted in this utility model simplifies the opening and closing process of the air hole and reduces manufacturing costs. At the same time, due to the relatively simple structure, the maintenance difficulty is correspondingly reduced, which helps to extend the service life of the equipment and improve its reliability.

[0007] As a further improvement to the above solution, a columnar cavity is provided at the top of the piston head, and a retaining ring is embedded in the inner wall of the cavity. The retaining ring is located above the valve plate, and the inner diameter of the retaining ring is smaller than the outer diameter of the valve plate. This can effectively limit the movement range of the valve plate, ensuring that the valve plate can accurately and reliably block the air hole of the piston head when needed, while simplifying the structure and improving the overall reliability and durability.

[0008] As a further improvement to the above scheme, a sealing ring is provided on the inner wall of the intermediate contact seat, and the inner ring of the sealing ring contacts the outer wall of the cylinder; this can ensure that the high-pressure gas inside the circuit breaker can be smoothly blown out to extinguish the arc when the circuit breaker is opened, and can also prevent external impurities or moisture from entering the circuit breaker.

[0009] As a further improvement to the above scheme, the stationary contact assembly includes an arc-extinguishing chamber and a stationary arc contact located within the arc-extinguishing chamber. The nozzle of the moving contact assembly has a throat, the inner diameter of which is not less than the diameter of the stationary arc contact. The inner diameter of the nozzle gradually increases upwards and downwards from the throat position. During the opening process, when an arc forms between the stationary arc contact and the moving contact assembly, high-pressure gas can be more effectively blown towards the arc through the nozzle throat, enhancing the arc-extinguishing effect. Simultaneously, the gradual increase in the nozzle inner diameter helps reduce resistance during gas flow, improving arc-extinguishing efficiency. Furthermore, it helps prevent the arc from reigniting within the nozzle, thereby improving the breaking capacity and reliability of the circuit breaker.

[0010] As a further improvement to the above scheme, the end of the rod inside the cylinder near the stationary contact assembly is a hollow structure, and the inner diameter of the hollow structure inside the rod is not less than the diameter of the stationary arc contact.

[0011] As a further improvement to the above scheme, the travel of the nozzle of the moving contact assembly in the arc-extinguishing chamber is between 180mm and 220mm, and the length of the throat position of the nozzle is between 14mm and 16mm.

[0012] As a further improvement to the above scheme, the travel of the nozzle of the moving contact assembly in the arc-extinguishing chamber is 200 mm, and the length of the throat position of the nozzle is 15 mm.

[0013] As a further improvement to the above scheme, the upper end of the static arc contact is a static arc contact support, and the static arc contact support is provided with a steel sheath.

[0014] As can be seen from the above technical solutions, this utility model has at least the following technical effects or advantages:

[0015] The gravity-type valve plate structure adopted in this invention simplifies the opening and closing process of the air orifice, reducing manufacturing costs. Simultaneously, due to its relatively simple structure, maintenance difficulty is correspondingly reduced, which helps extend the service life of the equipment and improve its reliability. The moving contact assembly has a nozzle facing the stationary contact assembly. The nozzle has a throat, and its inner diameter gradually increases upwards from the throat. This allows high-pressure gas to be more effectively blown towards the arc through the nozzle throat during the opening process when an arc forms between the stationary and moving contact assemblies, enhancing the arc-blowing effect. At the same time, the gradual increase in the nozzle's inner diameter helps reduce gas flow resistance, improving arc-blowing efficiency. Furthermore, it helps prevent the arc from reigniting within the nozzle, thereby improving the circuit breaker's breaking capacity and reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model (open state);

[0018] Figure 2 This is a schematic diagram of the overall structure of this utility model (closed state);

[0019] Figure 3 This is a partially enlarged schematic diagram of the present invention;

[0020] Figure 4 This is a schematic diagram illustrating the use of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Intermediate contact seat; 2. Stationary contact assembly; 3. Arc extinguishing chamber; 4. Stationary arc contact; 5. Piston seat; 6. Piston head; 7. Cylinder; 8. Rod; 9. Nozzle; 10. Expansion chamber; 11. Valve plate; 12. Retaining ring. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this patent.

[0023] This utility model discloses a structure for a 252kV / 63kA air-cooled GIS circuit breaker, such as... Figures 1 to 4 As shown, it includes an intermediate contact seat 1, a moving contact assembly, a stationary contact assembly 2, and a piston seat 5. A piston head 6 is provided on the piston seat 5. The moving contact assembly includes a cylinder 7 and a rod 8 fixed inside the cylinder 7. The end of the rod 8 away from the stationary contact assembly 2 passes through the piston seat 5 and is connected to a spring operating mechanism via an insulating pull rod. The inner wall of the cylinder 7 contacts the piston head 6 and forms an expansion chamber 10 above the piston head 6. The outer wall of the cylinder 7 contacts the intermediate contact seat 1.

[0024] The stationary contact assembly 2 includes an arc-extinguishing chamber 3 and a stationary arc contact 4 located within the arc-extinguishing chamber 3. The stationary arc contact 4 is a column extending toward the moving contact assembly. The moving contact assembly also includes a nozzle 9 toward the stationary contact assembly 2. The nozzle 9 has a throat, and the inner diameter of the throat of the nozzle 9 is not less than the diameter of the stationary arc contact 4. The inner diameter of the nozzle 9 gradually increases upward and downward from the throat position. Thus, during the opening process, when the stationary arc contact 4 is located at the opening of the nozzle 9, the high-pressure gas in the expansion chamber 10 can be quickly blown out, thereby extinguishing the arc.

[0025] The piston head 6 has an axially penetrating vent and an annular valve plate 11. When the valve plate 11 contacts the top surface of the piston head 6, the vent can be blocked. Furthermore, the top of the piston head 6 has a cylindrical cavity, the inner wall of which is fitted with a retaining ring 12. The retaining ring 12 is located above the valve plate 11, and its inner diameter is smaller than the outer diameter of the valve plate 11. Thus, the retaining ring 12 restricts the position of the valve plate 11 within the cylindrical cavity at the top of the piston head 6.

[0026] The inner wall of the intermediate contact seat 1 is provided with a sealing ring. The inner ring of the sealing ring contacts the outer wall of the cylinder 7. During the closing or opening process, the outer wall of the cylinder 7 of the moving contact assembly contacts and slides against the sealing ring. The sealing ring can improve the reliability of the moving contact assembly during operation. The end of the rod 8 of the moving contact assembly near the stationary contact assembly 2 is a hollow structure. The inner diameter of the hollow structure inside the rod 8 is not less than the diameter of the stationary arc contact 4. Thus, when in the closed state, the lower end of the stationary arc contact 4 can extend into the hollow structure of the rod 8 after passing through the throat of the nozzle 9. The other end of the rod 8 is connected to a spring operating mechanism. The spring operating mechanism is a CT26 spring operating mechanism, which is existing technology and will not be described in detail here.

[0027] The travel of the nozzle 9 of the moving contact assembly within the arc-extinguishing chamber 3 is between 180 mm and 220 mm, preferably 200 mm. The throat length of the nozzle 9 is between 14 mm and 16 mm, preferably 15 mm. This ensures that the circuit breaker has sufficient arc-extinguishing capability during the opening process.

[0028] In addition, a static arc contact support is provided at the upper end of the static arc contact 4, and the static arc contact support is equipped with a steel sheath. The steel sheath can further reduce the risk of casing breakdown caused by ablation of metal ions brought about by air blowing.

[0029] The working process of this utility model is as follows:

[0030] Opening Process: Initially, the circuit breaker is in the closed state, and the pressure inside the expansion chamber 10 is balanced with the external pressure. The moving contact assembly is connected to the stationary contact assembly 2, and the circuit is in a conductive state. Since the spring operating mechanism is connected to the rod 8 of the moving contact assembly through an insulating pull rod, when the opening signal is received, the spring operating mechanism starts to move, driving the moving contact assembly to open. During this process, the valve plate 11, under the combined action of gravity and air pressure, blocks the air hole at the piston head 6. At this time, the stationary arc contact 4 has not yet been pulled out of the throat of the nozzle 9. As the moving contact assembly continues to move, the gas inside the expansion chamber 10 is compressed, and the pressure inside the cylinder gradually increases. When the stationary arc contact 4 is located at the opening of the nozzle 9, the high-pressure gas inside the expansion chamber 10 is quickly blown out, thereby extinguishing the arc and achieving successful arc extinguishing.

[0031] Closing Process: Initially, the circuit breaker is in the open state, and the pressure inside the expansion chamber 10 is balanced with the external pressure. When a closing signal is received, the spring operating mechanism actuates, driving the moving contact assembly to close. During this process, as the moving contact assembly moves, the pressure inside the expansion chamber 10 gradually decreases, creating a pressure difference with the outside. Under the action of this pressure difference, the valve plate 11 moves to the position of the retaining ring 12, at which point the vent at the piston head 6 opens, allowing air to enter. When the moving contact assembly reaches the closed position, the air intake process stops. Under the action of gravity, the valve plate 11 returns to the upper end face of the piston head 6, sealing the vent and preparing for the next opening.

[0032] As can be seen, the air-operated GIS circuit breaker disclosed in this utility model achieves efficient and reliable circuit opening and closing operations. At the same time, its gravity-type valve plate structure simplifies the opening and closing process of the air vents, reducing manufacturing costs and maintenance difficulty.

[0033] In the description of this utility model, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this utility model and do not require that this utility model be constructed or operated in a specific orientation, and therefore should not be construed as limiting this utility model. The terms "connected" and "linked" in this utility model should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0034] 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 its 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 novelty disclosed herein.

Claims

1. A 252 kV / 63 kA compressed air GIS circuit breaker structure comprising an intermediate contact holder (1), a moving contact assembly, a stationary contact assembly (2) and a piston holder (5), the moving contact assembly being connected to a spring operating mechanism through an insulating pull rod at the end far from the stationary contact assembly (2) after penetrating the piston holder (5), characterized in that, The piston head (6) is arranged on the piston seat (5), the moving contact assembly comprises a nozzle (9), a barrel (7) and a rod (8) fixed in the barrel (7), the outer wall of the barrel (7) is in contact with the middle contact seat (1), the inner wall of the barrel (7) is in contact with the piston head (6) and forms an expansion chamber (10) above the piston head (6), the piston head (6) is provided with a gas hole penetrating in the axial direction and an annular valve plate (11), when the valve plate (11) is in contact with the top surface of the piston head (6), the gas hole of the piston head (6) can be blocked.

2. A compressed air type GIS circuit breaker structure of 252 kV / 63 kA according to claim 1, characterized in that, The top of the piston head (6) is provided with a cylindrical cavity, the inner wall of the cavity is embedded with a retaining ring (12), the retaining ring (12) is located above the valve plate (11), and the inner diameter of the retaining ring (12) is smaller than the outer diameter of the valve plate (11).

3. The structure of a 252 kV / 63 kA compressed air type GIS circuit breaker according to claim 1, wherein, The inner wall of the middle contact seat (1) is provided with a sealing ring, the inner ring of the sealing ring is in contact with the outer wall of the barrel (7).

4. The structure of a 252 kV / 63 kA compressed air type GIS circuit breaker according to claim 1, wherein, The static contact assembly (2) comprises an arc extinguishing chamber (3) and a static arc contact (4) in the arc extinguishing chamber (3), the nozzle (9) of the moving contact assembly has a throat, the inner diameter of the throat of the nozzle (9) is not less than the diameter of the static arc contact (4), and the inner diameter of the nozzle (9) gradually expands upwards and downwards from the throat position.

5. The structure of a 252 kV / 63 kA compressed gas GIS circuit breaker according to claim 4, characterized in that, The end of the rod (8) in the barrel (7) close to the static contact assembly (2) is a hollow structure, and the inner diameter of the hollow structure in the rod (8) is not less than the diameter of the static arc contact (4).

6. A 252 kV / 63 kA compressed air type GIS circuit breaker structure according to claim 5, characterized in that, The stroke of the nozzle (9) of the moving contact assembly in the arc extinguishing chamber (3) is between 180mm and 220mm, and the length of the throat position of the nozzle (9) is between 14mm and 16mm.

7. The structure of a 252 kV / 63 kA compressed air type GIS circuit breaker according to claim 6, wherein, The stroke of the nozzle (9) of the moving contact assembly in the arc extinguishing chamber (3) is 200mm, and the length of the throat position of the nozzle (9) is 15mm.

8. The structure of a 252 kV / 63 kA compressed gas GIS circuit breaker according to claim 1, wherein, The upper end of the static arc contact (4) is a static arc contact support, and the static arc contact support is provided with a steel sheath.

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