Integrated permanent fast magnetic circuit breaker

Abstract

The utility model discloses an integrated permanent fast magnetic circuit breaker, and belongs to the technical field of circuit breakers. Comprising an epoxy resin solid sealing sleeve and a multi-phase circuit breaker. Wherein a plurality of accommodating holes are defined by the epoxy resin solid sealing sleeve to be suitable for accommodating arc extinguish chambers of each phase of the multi-phase circuit breaker. The epoxy resin solid sealing sleeve is an external protection and support structure of the circuit breaker, and has high insulativity and high mechanical strength. The first climbing skirts are arranged between the adjacent placing holes of the epoxy resin solid sealing sleeve, so that the heat dissipation area is increased, the creepage distance can be effectively increased, and the insulating property is improved. Therefore, the circuit breaker has excellent insulation performance and efficient heat dissipation capability at the same time. In a high-voltage and large-current environment, insulation breakdown and surface flashover can be prevented, heat generated by operation can be quickly dissipated, and long-term stable operation of the circuit breaker is guaranteed.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and in particular to an integrated permanent fast magnetic circuit breaker. Background Technology

[0002] Ring main units (RNBs) are crucial power distribution equipment in new power systems, undertaking key tasks such as distributing electrical energy, controlling circuit switching, and protecting line safety. Their reliability and stability directly affect the power supply quality of the entire power system. Currently, in related technical fields, RNBs primarily rely on fans or natural ventilation to dissipate and diffuse heat.

[0003] However, these traditional heat dissipation methods are inadequate when dealing with the heat dissipation requirements of circuit breakers within ring main units. As a core component of the ring main unit, the circuit breaker plays a crucial role in disconnecting and connecting circuits. Especially under the complex and variable operating conditions of new power systems, circuit breakers need to withstand higher short-circuit breaking currents and handle more frequent operations. During operation, circuit breakers generate significant heat due to eddy current losses caused by current passing through conductors and mechanical friction from the relative movement of mechanical components. If this heat cannot be dissipated effectively and promptly, the internal temperature of the circuit breaker will continue to rise. High temperatures not only accelerate the aging of the internal insulation materials, reducing their insulation performance and increasing the risk of insulation breakdown, but may also cause thermal deformation and thermal fatigue damage to the mechanical components, severely affecting the circuit breaker's service life and operational reliability, thus posing a potential threat to the stable operation of the entire new power system. Summary of the Invention

[0004] The purpose of this application is to provide an integrated permanent fast magnetic circuit breaker to solve the problem of insufficient heat dissipation of circuit breakers in ring main units in the prior art.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] This application provides an integrated permanent fast magnetic circuit breaker, comprising: an epoxy resin sealed bushing and a multiphase circuit breaker, wherein the epoxy resin sealed bushing defines a plurality of receiving holes suitable for accommodating the arc-extinguishing chambers of each phase of the multiphase circuit breaker, and the epoxy resin sealed bushing is provided with a climbing skirt between two adjacent receiving holes.

[0007] In this design, the epoxy resin-sealed bushing serves as the external protection and support structure for the circuit breaker, possessing high insulation and high mechanical strength. A first creepage skirt is installed between adjacent mounting holes on the epoxy resin-sealed bushing, which not only increases the heat dissipation area but also effectively increases the creepage distance, improving insulation performance. This allows the circuit breaker to simultaneously possess excellent insulation performance and efficient heat dissipation capabilities. Under high-voltage and high-current environments, it can prevent insulation breakdown and surface flashover while rapidly dissipating the heat generated during operation, ensuring the long-term stable operation of the circuit breaker.

[0008] Optionally, the epoxy resin sealing sleeve defines a heat dissipation duct, the epoxy resin sealing sleeve has a plurality of protrusions, and the heat dissipation duct has heat dissipation openings on the protrusions.

[0009] When the circuit breaker is running, the heat generated by the arc-extinguishing chambers of each phase can be quickly conducted to the heat dissipation vents through the heat dissipation ducts under the action of airflow circulation inside the ring main unit, and then dissipated into the surrounding environment, effectively reducing the internal temperature of the circuit breaker and avoiding local overheating.

[0010] Optionally, a shielding ring is provided at the heat dissipation vent.

[0011] Shielding rings are used to shield against electromagnetic interference. In complex power systems, various electromagnetic fields exist, which can interfere with the electronic components and signal transmissions inside circuit breakers, affecting their normal operation. Shielding rings form an electromagnetic shielding layer, blocking external electromagnetic fields and ensuring that the internal electronic components of the circuit breaker operate in a stable electromagnetic environment, thereby improving the reliability and stability of the circuit breaker.

[0012] Optionally, a partial discharge sensor and an infrared temperature sensor are installed inside the heat dissipation duct.

[0013] Optionally, the partial discharge sensor includes a high-frequency current transformer and an ultra-high frequency sensor.

[0014] Infrared temperature sensors receive infrared radiation emitted from the surface of circuit breakers and convert it into temperature values, enabling precise temperature measurement for real-time monitoring of the internal temperature of circuit breakers. Partial discharge sensors include high-frequency current transformers and ultra-high-frequency sensors. Partial discharge is a significant indicator of insulation degradation in electrical equipment; timely detection can effectively prevent equipment failures. High-frequency current transformers detect the high-frequency current signals generated by partial discharges and convert them into measurable voltage signals for monitoring. Ultra-high-frequency sensors utilize the ultra-high-frequency electromagnetic wave signals generated by partial discharges for detection, offering advantages such as high sensitivity and strong anti-interference capabilities. The combination of these two technologies allows for comprehensive monitoring of the partial discharge status of circuit breakers from different perspectives, providing accurate data for equipment condition assessment and fault diagnosis.

[0015] Optionally, each phase arc-extinguishing chamber of the multiphase circuit breaker is individually equipped with a permanent magnet mechanism.

[0016] In this solution, each phase arc-extinguishing chamber of the multiphase circuit breaker is equipped with a permanent magnet mechanism, which can quickly respond to operation commands, significantly improve the opening and closing speed and operation accuracy, realize rapid closing and opening, effectively shorten the fault duration, and reduce the risk of equipment damage.

[0017] Optionally, the permanent magnet mechanism includes an insulating pull rod connected to the arc-extinguishing chamber of the multiphase circuit breaker, and the insulating pull rod is provided with a flexible connection.

[0018] In practical applications, integrated permanent fast magnetic circuit breakers are usually connected in multiple groups. This solution uses a flexible connection to connect multiple integrated permanent fast magnetic circuit breakers. The flexible connection usually uses copper sheets, which can provide a certain buffer and compensation during the movement of the moving contact in the arc-extinguishing chamber.

[0019] Optionally, the integrated permanent fast magnetic circuit breaker further includes a disconnecting switch, which includes an isolation shaft with a moving contact on it. The multi-phase circuit breaker has a stationary contact corresponding to the moving contact. Rotating the isolation shaft can drive the moving contact to rotate so that the moving contact engages or disengages with the stationary contact.

[0020] Traditional circuit breakers and disconnectors require separate installation and connection, resulting in complex assembly and numerous components. The integrated permanent fast magnetic circuit breaker in this solution integrates the disconnector, reducing the need for external connection components and installation space. Furthermore, the operation of the disconnector and circuit breaker is more closely and accurately coordinated, enabling rapid and reliable connection or disconnection of the circuit when needed, thus improving the reliability and safety of the entire power system.

[0021] Compared with existing technologies, the beneficial effects achieved by this application are as follows: This application provides support for multiphase circuit breakers using epoxy resin-sealed bushings, achieving both high insulation and high mechanical strength while improving the internal space utilization of the ring main unit. The epoxy resin-sealed bushings feature a first creepage skirt between adjacent mounting holes, which not only increases the heat dissipation area but also effectively increases the creepage distance, enhancing insulation performance. This results in the circuit breaker possessing both excellent insulation performance and efficient heat dissipation capabilities. Under high voltage and high current conditions, it can prevent insulation breakdown and surface flashover while efficiently dissipating heat, ensuring the long-term stable operation of the circuit breaker. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure 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 some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of some embodiments provided in this application;

[0024] Figure 2 These are structural diagrams of epoxy resin-sealed sleeves from some embodiments provided in this application;

[0025] Figure 3 These are structural diagrams of heat dissipation ducts from some embodiments provided in this application;

[0026] Figure 4 These are front views of some embodiments provided in this application.

[0027] Explanation of reference numerals in the attached drawings: 1-Epoxy resin sealed bushing; 2-Multiphase circuit breaker; 3-Permanent magnet mechanism; 4-Disconnecting switch; 5-Shielding ring; 6-Infrared temperature sensor; 7-Partial discharge sensor; 11-Accommodation hole; 12-First climbing skirt; 13-Heat dissipation duct; 14-Protrusion; 15-Second climbing skirt; 21-Stationary contact; 31-Insulating tie rod; 32-Flexible connection; 41-Isolation shaft; 71-High-frequency current transformer; 72-Ultra-high frequency sensor; 141-Heat dissipation port; 411-Moving contact. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure / application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0029] Example 1

[0030] This embodiment describes an integrated permanent fast magnetic circuit breaker, referencing... Figure 1 and Figure 2The integrated permanent magnet circuit breaker in this embodiment includes an epoxy resin-sealed bushing 1 and a multiphase circuit breaker 2. The epoxy resin-sealed bushing 1 defines multiple receiving holes 11 to accommodate the arc-extinguishing chambers of each phase of the multiphase circuit breaker 2. The epoxy resin-sealed bushing 1 serves as the external protection and support structure of the circuit breaker, possessing high insulation and high mechanical strength. Furthermore, the epoxy resin-sealed bushing 1 has first creepage skirts 12 between adjacent placement holes. These first creepage skirts 12 not only increase the heat dissipation area but also effectively increase the creepage distance, improving insulation performance. This allows the circuit breaker to simultaneously possess excellent insulation performance and efficient heat dissipation capabilities. Under high voltage and high current environments, it can prevent insulation breakdown and surface flashover while rapidly dissipating the heat generated during operation, ensuring long-term stable operation of the circuit breaker. Furthermore, several second creepage skirts 15 are provided on the sidewall of the epoxy resin-sealed bushing 1 to further increase the heat dissipation area.

[0031] In this embodiment, a heat dissipation duct 13 is defined within the epoxy resin-sealed sleeve 1. The epoxy resin-sealed sleeve 1 has several protrusions 14, and the heat dissipation duct 13 has heat dissipation openings 141 on the protrusions 14. When the circuit breaker is running, the heat generated by each phase arc-extinguishing chamber can be quickly conducted to the heat dissipation openings 141 through the heat dissipation duct 13 under the action of airflow circulation inside the ring main unit, and then dissipated into the surrounding environment, effectively reducing the internal temperature of the circuit breaker and avoiding local overheating.

[0032] In complex power systems, various electromagnetic fields exist, which can interfere with the electronic components and signal transmissions inside circuit breakers, affecting their normal operation. To avoid electromagnetic interference, this embodiment includes a shielding ring 5 at the heat dissipation port 141. The shielding ring 5 forms an electromagnetic shielding layer, blocking external electromagnetic fields and ensuring that the internal electronic components of the circuit breaker operate in a stable electromagnetic environment, thereby improving the reliability and stability of the circuit breaker.

[0033] refer to Figure 3A partial discharge sensor 7 and an infrared temperature sensor 6 are installed within the heat dissipation duct 13. The infrared temperature sensor 6 receives infrared radiation emitted from the circuit breaker surface and converts it into a temperature value, enabling precise temperature measurement for real-time monitoring of the circuit breaker's internal temperature. The partial discharge sensor 7 comprises a high-frequency current transformer 71 and an ultra-high frequency sensor 72. Partial discharge is a significant indicator of insulation degradation in electrical equipment; timely detection can effectively prevent equipment failure. The high-frequency current transformer 71 detects the high-frequency current signal generated by partial discharge and converts it into a measurable voltage signal for monitoring. The ultra-high frequency sensor 72 utilizes the ultra-high frequency electromagnetic wave signal generated by partial discharge for detection, offering advantages such as high sensitivity and strong anti-interference capabilities. The combination of these two sensors allows for comprehensive monitoring of the circuit breaker's partial discharge status from different perspectives, providing accurate data for equipment condition assessment and fault diagnosis.

[0034] Example 2:

[0035] Based on the same inventive concept as Embodiment 1, refer to Figure 1 and Figure 4 In this embodiment, the multiphase circuit breaker 2 is a three-phase circuit breaker. Each phase arc-extinguishing chamber of the three-phase circuit breaker is equipped with a permanent magnet mechanism 3, which can quickly respond to operation commands, significantly improve the opening and closing speed and operation accuracy, realize rapid closing and opening, effectively shorten the fault duration, and reduce the risk of equipment damage. The permanent magnet mechanism 3 includes an insulating pull rod 31 connected to the arc-extinguishing chamber of the three-phase circuit breaker, and a flexible connection 32 is provided on the insulating pull rod 31. In practical applications, the integrated permanent fast magnetic circuit breaker of this embodiment is usually used in multiple connected sets. In this embodiment, multiple sets of integrated permanent fast magnetic circuit breakers are connected through the flexible connection 32. The flexible connection 32 is usually made of copper sheet, which can provide a certain buffer and compensation during the movement of the moving contact 411 in the arc-extinguishing chamber.

[0036] The integrated permanent magnet circuit breaker in this embodiment also includes a disconnecting switch 4. The disconnecting switch 4 includes an isolation shaft 41, on which a moving contact 411 is disposed. The three-phase circuit breaker is provided with a stationary contact 21 corresponding to the moving contact 411. In this embodiment, the disconnecting switch 4 is a three-position disconnecting switch 4, including: a closing position, an opening position, and a grounding position. In the closing position, the moving contact 411 is in close contact with the stationary contact 21 to ensure continuous current transmission; in the opening position, the moving contact 411 is separated from the stationary contact 21 to cut off the current; in the grounding position, the moving contact 411 of the disconnecting switch 4 is connected to the grounding device to ensure the safety of the equipment during maintenance or repair.

[0037] Compared to traditional circuit breakers and disconnectors 4, which require separate installation and connection, resulting in complex assembly and numerous components, the integrated permanent fast magnetic circuit breaker in this embodiment integrates the disconnector 4, reducing the need for external connection components and installation space. Furthermore, the operation of the disconnector 4 and the three-phase circuit breaker is more closely and accurately coordinated, enabling rapid and reliable connection or disconnection of the circuit when needed, thus improving the reliability and safety of the entire power system.

[0038] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this disclosure / application, and these improvements and modifications should also be considered within the protection scope of this disclosure / application.

Claims

1. An integrated permanent fast magnetic circuit breaker, characterized in that, include: An epoxy resin sealed bushing (1) and a multiphase circuit breaker (2) are provided. The epoxy resin sealed bushing (1) defines a plurality of receiving holes (11) to accommodate the arc-extinguishing chambers of each phase of the multiphase circuit breaker (2). A first climbing skirt (12) is provided between two adjacent receiving holes (11).

2. The integrated permanent fast magnetic circuit breaker according to claim 1, characterized in that, The epoxy resin sealing sleeve (1) defines a heat dissipation duct (13), and the epoxy resin sealing sleeve (1) has a plurality of protrusions (14), and the heat dissipation duct (13) has a heat dissipation port (141) on the protrusions (14).

3. The integrated permanent fast magnetic circuit breaker according to claim 2, characterized in that, A shielding ring (5) is provided at the heat dissipation port (141).

4. The integrated permanent fast magnetic circuit breaker according to claim 2, characterized in that, A partial discharge sensor (7) and an infrared temperature sensor (6) are installed inside the heat dissipation duct (13).

5. The integrated permanent fast magnetic circuit breaker according to claim 4, characterized in that, The partial discharge sensor (7) includes a high-frequency current transformer (71) and an ultra-high frequency sensor (72).

6. The integrated permanent fast magnetic circuit breaker according to claim 1, characterized in that, The epoxy resin sealing sleeve (1) has several second climbing skirts (15) on its side wall.

7. The integrated permanent fast magnetic circuit breaker according to claim 1, characterized in that, Each phase arc-extinguishing chamber of the multiphase circuit breaker (2) is individually equipped with a permanent magnet mechanism (3).

8. The integrated permanent fast magnetic circuit breaker according to claim 7, characterized in that, The permanent magnet mechanism (3) includes an insulating pull rod (31) connected to the arc-extinguishing chamber of the multiphase circuit breaker (2), and a flexible connection (32) is provided on the insulating pull rod (31).

9. The integrated permanent fast magnetic circuit breaker according to claim 1, characterized in that, The integrated permanent fast magnetic circuit breaker also includes a disconnecting switch (4), which includes an isolation shaft (41). A moving contact (411) is provided on the isolation shaft (41), and a stationary contact (21) corresponding to the moving contact (411) is provided on the multi-phase circuit breaker (2). By rotating the isolation shaft (41), the moving contact (411) can be driven to rotate so that the moving contact (411) can be engaged or disengaged from the stationary contact (21).

10. The integrated permanent fast magnetic circuit breaker according to claim 1, characterized in that, The multiphase circuit breaker (2) is a three-phase circuit breaker.

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