Upper isolation circuit breaker switch module for ring main unit

Abstract

The utility model discloses an upper isolation circuit breaker switch module for a ring main unit, particularly relates to the technical field of circuit breaker switches, and comprises a circuit breaker frame which is provided with an isolation switch assembly; the isolation switch assembly comprises a moving contact, an upper contact, a static contact and a first transmission assembly. The first transmission assembly is used for driving the moving contact to move. According to the utility model, through the movement of the moving contact between the upper contact and the static contact, switching among three states of opening, grounding and closing is realized, a flexible control function is provided, in the opening state, the moving contact is not connected with any contact, safe isolation of a circuit is realized, safe maintenance and overhaul are facilitated, and in the grounding state, the moving contact is not connected with any contact. The movable contact is connected with the upper contact, so that reliable grounding protection can be provided to prevent dangers caused by electrical faults, and in a closing state, the movable contact is connected with the static contact, so that conduction of a circuit is realized, and continuity of power supply and stability of equipment operation are ensured.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker switch technology, and more specifically, to an isolation circuit breaker switch module for ring main units. Background Technology

[0002] The upper isolating circuit breaker switch module in a ring main unit is a modular device that integrates the functions of an isolating switch and a circuit breaker. It is typically used in medium-voltage power distribution systems, and its main functions include: isolation (providing physical isolation of the circuit to ensure maintenance safety); circuit breaking (automatically disconnecting the circuit in case of overload or short circuit to protect the system); and modular design (facilitating installation and maintenance, improving system flexibility and reliability). This combined design significantly improves equipment efficiency while simplifying configuration, making it suitable for the needs of various power distribution networks.

[0003] In current ring main unit power supply systems, the ring main unit responsible for power distribution faces several key issues. Current circuit breaker designs only provide single opening and closing functions and lack grounding protection and isolation functions. Therefore, during system maintenance or fault repair, operators need to manually ground the circuit, which increases the complexity of operation and safety risks. In addition, the existing equipment has a complex structure and a cumbersome maintenance process, which affects maintenance efficiency and equipment reliability. Utility Model Content

[0004] This utility model provides an isolating circuit breaker switch module for ring main units, which aims to solve the following problems: In existing ring main unit power supply systems, the ring main unit responsible for power distribution faces several key issues. Current circuit breaker designs only provide single opening and closing functions and lack grounding protection and isolation functions. Therefore, during system maintenance or fault repair, operators need to manually ground the circuit, which increases the complexity of operation and safety risks. In addition, the existing equipment has a complex structure and a cumbersome maintenance process, which affects maintenance efficiency and equipment reliability.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a ring main unit with an upper isolating circuit breaker switch module, comprising: a circuit breaker frame, and an isolating switch assembly disposed on the circuit breaker frame;

[0006] The disconnector assembly includes a moving contact, an upper contact, a stationary contact, and a transmission assembly. The transmission assembly is used to drive the moving contact to move between the upper contact and the stationary contact. When the moving contact is between the upper contact and the stationary contact and is not connected to either of them, it is in the open state. When the moving contact is connected to the upper contact, it is in the grounded state. When the moving contact is connected to the stationary contact, it is in the closed state.

[0007] In a preferred embodiment, the transmission assembly includes a main shaft, which is hinged to the circuit breaker frame. A crank arm is hinged to the main shaft, and the moving contact is hinged to the crank arm. Both the upper contact and the stationary contact are mounted on the circuit breaker frame.

[0008] In a preferred embodiment, the disconnecting switch assembly further includes a vacuum arc-extinguishing assembly, which includes a vacuum arc-extinguishing chamber. The vacuum arc-extinguishing chamber has a fixed end and a moving end at both ends. The fixed end of the arc-extinguishing chamber is fixedly connected to the stationary contact by an insulating bracket and bolts. The moving end of the arc-extinguishing chamber is provided with a pull rod, and a flexible connection is provided between the moving end of the arc-extinguishing chamber and the pull rod. The pull rod achieves the connection and disconnection of the circuit by sliding up and down.

[0009] In a preferred embodiment, a spring is provided on the pull rod, and the spring is used to reset the pull rod.

[0010] In a preferred embodiment, the vacuum interrupter further includes a transmission assembly two for driving the pull rod to slide up and down. The transmission assembly two includes a main shaft two with a cam on it and a roller inside the cam. The roller is located at the bottom end of the pull rod.

[0011] The beneficial effects of this utility model are as follows:

[0012] This invention achieves switching between three states—open, grounded, and closed—through the movement of the moving contact between the upper and stationary contacts, providing flexible control functions. In the open state, the moving contact is not connected to any other contact, achieving safe circuit isolation and facilitating safe maintenance and repair. In the grounded state, the moving contact connects to the upper contact, providing reliable grounding protection to prevent dangers caused by electrical faults. In the closed state, the moving contact connects to the stationary contact, achieving circuit conduction and ensuring the continuity of power supply and the stability of equipment operation. By realizing multiple functions through a single module, the complexity of the equipment is simplified, and the reliability and maintenance convenience of the system are improved. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 .

[0014] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .

[0015] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0016] The attached diagram is labeled as follows: 1. Circuit breaker frame; 2. Disconnector assembly; 21. Moving contact; 22. Upper contact; 23. Stationary contact; 24. Transmission assembly one; 241. Main shaft one; 242. Crank arm; 3. Vacuum arc extinguishing assembly; 31. Vacuum arc extinguishing chamber; 311. Arc extinguishing chamber fixed end; 312. Arc extinguishing chamber moving end; 32. Pull rod; 33. Flexible connection; 34. Spring; 35. Transmission assembly two; 351. Main shaft two; 352. Cam; 353. Roller. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0018] Refer to the instruction manual appendix Figures 1 to 3 A ring main unit with an isolating circuit breaker switch module includes: a circuit breaker frame 1, and an isolating switch assembly 2 disposed on the circuit breaker frame 1;

[0019] The disconnector assembly 2 includes a moving contact 21, an upper contact 22, a stationary contact 23, and a transmission assembly 24. The transmission assembly 24 is used to drive the moving contact 21 to move between the upper contact 22 and the stationary contact 23. When the moving contact 21 is located between the upper contact 22 and the stationary contact 23 and is not connected to the upper contact 22 and the stationary contact 23, it is in the open state. When the moving contact 21 is connected to the upper contact 22, it is in the grounded state. When the moving contact 21 is connected to the stationary contact 23, it is in the closed state.

[0020] It should be noted that the transmission assembly 24 can drive the hinge rod through the drive shaft to move the moving contact 21 between the upper contact 22 and the stationary contact 23.

[0021] The specific implementation scenario is as follows: The moving contact 21 is moved between the upper contact 22 and the stationary contact 23 by the drive shaft to the hinge rod. When the moving contact 21 is between the upper contact 22 and the stationary contact 23 and is not connected to either of them, it is in the open state. When the moving contact 21 is connected to the upper contact 22, it is in the grounded state. When the moving contact 21 is connected to the stationary contact 23, it is in the closed state. The movement of the moving contact 21 between the upper contact 22 and the stationary contact 23 achieves the switching between the three states of open, grounded, and closed, providing flexible operation. The control function allows the moving contact 21 to be disconnected from any other contact in the open state, achieving safe circuit isolation and facilitating safe maintenance and repair. In the grounded state, the moving contact 21 is connected to the upper contact 22, providing reliable grounding protection to prevent dangers caused by electrical faults. In the closed state, the moving contact 21 is connected to the stationary contact 23, enabling circuit conduction and ensuring the continuity of power supply and the stability of equipment operation. By implementing multiple functions through a single module, the complexity of the equipment is simplified, and the reliability and maintenance convenience of the system are improved.

[0022] Further, please refer to the appendix to the instruction manual. Figure 3 The transmission assembly 24 includes a main shaft 241, which is hinged to the circuit breaker frame 1. A crank arm 242 is hinged to the main shaft 241, and the moving contact 21 is hinged to the crank arm 242. The upper contact 22 and the stationary contact 23 are both mounted on the circuit breaker frame 1.

[0023] It should be noted that the hinged main shaft 241 rotates to drive the crank arm 242, which in turn drives the moving contact 21 to move between the upper contact 22 and the stationary contact 23, thereby achieving the switching between the three states of opening, grounding, and closing.

[0024] Further, please refer to the appendix to the instruction manual. Figure 3 The disconnector switch assembly 2 also includes a vacuum arc extinguishing assembly 3, which includes a vacuum arc extinguishing chamber 31. The vacuum arc extinguishing chamber 31 has a fixed end 311 and a moving end 312 at both ends. The fixed end 311 is fixedly connected to the stationary contact 23 by an insulating bracket and bolts. The moving end 312 is provided with a pull rod 32. A flexible connection 33 is provided between the moving end 312 and the pull rod 32. The pull rod 32 moves up and down to connect and disconnect the circuit.

[0025] It should be noted that when the lever 32 starts to move, it causes the moving end 312 of the arc-extinguishing chamber to slide downwards, gradually disengaging from the stationary contact 23. During this disengagement process, the arc is elongated and formed between the moving end 312 and the stationary end 311 of the arc-extinguishing chamber. After the arc is formed, the arc will be quickly extinguished because the vacuum arc-extinguishing chamber 31 is in a vacuum state. The vacuum environment does not have enough particles to sustain the arc, causing the arc energy to dissipate rapidly. After the arc is extinguished, the lever 32 continues to move, ensuring that the moving end 312 and the stationary end 311 of the arc-extinguishing chamber are completely separated, and the circuit achieves a true physical disconnection. The system enters a safe disconnected state, and no current flows. The lever 32 then moves in the opposite direction, causing the moving end 312 of the arc-extinguishing chamber to slide upwards and re-engage with the stationary contact 23, ensuring good contact between the moving end 312 and the stationary end 311 of the arc-extinguishing chamber. Current resumes to flow, the circuit is closed again, and the system returns to normal operation.

[0026] It should also be noted that the vacuum interrupter 31 utilizes a vacuum environment to extinguish the arc. Since there is no gas medium in the vacuum, the arc is extinguished quickly and thoroughly, which can significantly improve the reliability and efficiency of arc extinguishing. During the circuit breaking and connecting process, the vacuum interrupter 31 can effectively avoid the high temperature and metal vapor diffusion generated by the arc, reduce the harm to other electrical components and operators, and improve the overall system safety. Through the up and down sliding of the pull rod 32, the vacuum interrupter assembly 3 can quickly perform circuit connecting and disconnecting operations with a fast response speed, which can realize rapid switching and greatly improve operating efficiency. The vacuum interrupter 31 can withstand high current in a short time. Through effective electromagnetic design and material selection, it can achieve stable breaking capacity under high voltage and high current conditions.

[0027] Further, please refer to the appendix to the instruction manual. Figure 3 A spring 34 is provided on the pull rod 32, and the spring 34 is used to reset the pull rod 32.

[0028] It should be noted that the spring 34 installed on the pull rod 32 stretches the spring 34 when the pull rod 32 is driven to move downward. When the pull rod 32 moves in the opposite direction, the spring 34 can ensure that the pull rod 32 returns to its original position.

[0029] Further, please refer to the appendix to the instruction manual. Figure 3 The vacuum interrupter 31 also includes a transmission assembly 35, which is used to drive the pull rod 32 to slide up and down. The transmission assembly 35 includes a main shaft 351, a cam 352 is provided on the main shaft 351, a roller 353 is provided in the cam 352, and the roller 353 is located at the bottom end of the pull rod 32.

[0030] It should be noted that by rotating the main shaft 351, the cam 352 is driven to move, which in turn drives the roller 353 to move, and the roller 353 can drive the pull rod 32 to move.

[0031] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A ring main unit with an upper isolating circuit breaker switch module, characterized in that, include: Circuit breaker frame (1), on which a disconnector assembly (2) is provided; The disconnector assembly (2) includes a moving contact (21), an upper contact (22), a stationary contact (23), and a transmission assembly (24). The transmission assembly (24) is used to drive the moving contact (21) to move between the upper contact (22) and the stationary contact (23). When the moving contact (21) is located between the upper contact (22) and the stationary contact (23) and is not connected to the upper contact (22) and the stationary contact (23), it is in the open state. When the moving contact (21) is connected to the upper contact (22), it is in the grounded state. When the moving contact (21) is connected to the stationary contact (23), it is in the closed state.

2. The isolating circuit breaker switch module for a ring main unit according to claim 1, characterized in that: The transmission assembly (24) includes a main shaft (241), which is hinged to the circuit breaker frame (1). A crank arm (242) is hinged to the main shaft (241), and the moving contact (21) is hinged to the crank arm (242). The upper contact (22) and the stationary contact (23) are both mounted on the circuit breaker frame (1).

3. A ring main unit isolation circuit breaker switch module according to claim 2, characterized in that: The disconnector switch assembly (2) further includes a vacuum arc extinguishing assembly (3), which includes a vacuum arc extinguishing chamber (31). The vacuum arc extinguishing chamber (31) has a fixed end (311) and a moving end (312) at both ends. The fixed end (311) is fixedly connected to the stationary contact (23) by an insulating bracket and bolts. The moving end (312) is provided with a pull rod (32). A flexible connection (33) is provided between the moving end (312) and the pull rod (32). The pull rod (32) moves up and down to connect and disconnect the circuit.

4. A ring main unit isolation circuit breaker switch module according to claim 3, characterized in that: A spring (34) is provided on the pull rod (32), and the spring (34) is used to reset the pull rod (32).

5. A ring main unit isolation circuit breaker switch module according to claim 4, characterized in that: The vacuum interrupter (31) further includes a transmission assembly two (35), which is used to drive the pull rod (32) to slide up and down. The transmission assembly two (35) includes a main shaft two (351), on which a cam (352) is provided, and a roller (353) is provided inside the cam (352). The roller (353) is located at the bottom end of the pull rod (32).

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