Lower isolation fully-sealed circuit breaker switch

Abstract

The utility model relates to a lower isolation fully-sealed circuit breaker switch, which comprises a mechanism frame, a circuit breaker assembly and an isolation switch assembly, and the circuit breaker assembly comprises three epoxy resin casting bodies, three vacuum arc extinguish chambers, three fixing seats, a main shaft and three groups of cam assemblies. The isolation switch assembly comprises an isolation shaft, three support sheets, three isolation knives which are respectively and rotatably arranged on the three support sheets and are in linkage cooperation with the isolation shaft, and three static contacts which are respectively arranged on the three epoxy resin casting bodies and are electrically connected with the three vacuum arc-extinguishing chambers. The lower cross beam is respectively provided with isolation convex rings which are arranged among the three supporting sheets in a separated mode, and the epoxy resin pouring body is respectively provided with three insulation cover bodies which cover one sides of the three static contacts. The utility model has the advantages of simple structure, compact structure, high expansibility, stable and reliable performance, good insulation performance and high assembly efficiency.

Description

Technical Field

[0001] This utility model relates to a circuit breaker switch, specifically a bottom-isolated fully enclosed circuit breaker switch. Background Technology

[0002] A ring main unit (RMU) is a set of electrical transmission and distribution equipment housed in a metal or non-metal insulated cabinet or assembled into a modular ring main unit. It typically uses sulfur hexafluoride (SF6), environmentally friendly gases, or epoxy resin as the insulating medium. For the rapidly developing power industry, using environmentally friendly gases as the insulating medium will be a significant future trend in the switchgear industry. The advantage of existing circuit breaker switches used in environmentally friendly gas cabinets lies in their maintenance-free characteristics. The switch employs a sealed enclosure structure, eliminating the threat of gas leakage and effectively isolating it from external contaminants, dust, and acid mist. This ensures the cleanliness of the operating environment and extends the service life of the busbars, circuit breakers, isolating switches, and grounding switches, achieving maintenance-free operation and significantly reducing the investment in distribution network operation and maintenance. However, existing circuit breaker switches have relatively small creepage distances between the three cam mounting bases, poor phase-to-phase insulation performance, posing significant safety hazards and low safety. Furthermore, these circuit breaker switches also suffer from drawbacks such as complex structure, non-compact design, large size, cumbersome assembly, and unreliable performance. Summary of the Invention

[0003] The purpose of this utility model is to overcome the defects of the prior art and provide a bottom-isolated fully enclosed circuit breaker switch that is simple in structure, stable and reliable in performance, compact in structure, highly expandable, has good insulation performance and high assembly efficiency.

[0004] To achieve the above objectives, this utility model employs a bottom-isolated fully enclosed circuit breaker switch, comprising a frame, a circuit breaker assembly mounted on the frame, and an isolating switch assembly mounted on the frame. The circuit breaker assembly includes three epoxy resin castings mounted on the frame, three vacuum interrupters mounted within the three epoxy resin castings, three fixed seats respectively mounted in receiving grooves at one end of the three epoxy resin castings, a main shaft rotatably mounted on the three fixed seats, and three cam assemblies rotatably mounted on the main shaft for driving the three sets of vacuum interrupters to perform opening and closing actions. The isolating switch assembly includes an isolating shaft rotatably mounted on the frame, three support plates respectively mounted on the lower crossbeam of the frame, three isolating blades rotatably mounted on the three support plates and linked with the isolating shaft, and three stationary contacts respectively mounted on the three epoxy resin castings and electrically connected to the three vacuum interrupters. The lower crossbeam is provided with isolating protrusions separating the three support plates, and the epoxy resin castings are respectively provided with three insulating covers covering one side of the three stationary contacts.

[0005] The advantages of the above structure are as follows: the three vacuum interrupters of the circuit breaker switch are respectively housed within epoxy resin castings, employing a fully encapsulated design. This results in a more compact and smaller structure, better protection, and improved insulation and electrical performance. The insulating cover of the epoxy resin castings over the stationary contacts increases the insulation distance between the three stationary contacts, improving three-phase insulation performance. Furthermore, the circuit breaker assembly and disconnector assembly adopt modular designs, making assembly more convenient. Therefore, this fully encapsulated circuit breaker switch with lower isolation features simple structure, stable and reliable performance, compact design, good insulation performance, and high assembly efficiency.

[0006] Specifically, three limiting plates are respectively provided on one side of the three stationary contacts, and buffer plates that cooperate with the three isolating blades are respectively provided between the three limiting plates and the three stationary contacts. The buffer plates can buffer the isolating blades, thereby ensuring more reliable contact between the isolating blades and the stationary contacts and a longer mechanical life.

[0007] Specifically, the isolation shaft is equipped with three insulating sleeves that are fitted onto the three isolation blades. The insulating sleeves on the isolation shaft are fitted onto the three isolation blades, thereby increasing the insulation distance between the three isolation blades and improving the three-phase insulation performance.

[0008] Specifically, the main shaft is equipped with insulating isolation disks spaced between the three epoxy resin castings. These insulating isolation disks increase the three-phase insulation spacing of the circuit breaker assembly, resulting in better insulation performance.

[0009] Specifically, the frame is equipped with a grounding contact assembly that mates with the three isolating switches. The grounding contact assembly includes a support plate mounted on the frame, a grounding conductive busbar mounted on the support plate, and three grounding contacts mounted on the grounding conductive busbar and mate with the three isolating switches. Three buffer pads, mate with the three isolating switches, are respectively provided on the support plate at the locations corresponding to the three grounding contacts. The grounding contact assembly adopts a modular structure design, which facilitates modular assembly of the circuit breaker switch. Furthermore, the buffer pads cushion the isolating switches, ensuring reliable contact between the isolating switches and the grounding contacts and reducing damage.

[0010] Specifically, the support plate is equipped with three insulating transparent covers corresponding to the three grounding contacts, and each of the three insulating transparent covers has an arc-shaped insulating isolation channel that matches the movement trajectory of the three isolating blades. The insulating transparent covers can increase the insulation distance between the three isolating blades, resulting in better three-phase insulation performance.

[0011] Specifically, the pull rod of the vacuum interrupter is equipped with a flexible connector, and two fixing holes that mate with the flexible connector are respectively provided on both sides of the fixing base. Bolts that connect to the fixing holes are provided on the conductive copper busbar of the flexible connector. The two fixing holes on both sides of the fixing base allow for bidirectional extension of the flexible connector, enabling flexible connection to be flexibly assembled according to user needs, providing high expandability and greater user convenience. Attached Figure Description

[0012] Figure 1 This is a perspective view of an embodiment of the present utility model.

[0013] Figure 2 This is a cross-sectional view of an embodiment of the present utility model.

[0014] Figure 3 This is an exploded view of an embodiment of the present utility model. Detailed Implementation

[0015] like Figures 1-3As shown, this utility model embodiment is a bottom-isolated fully solid-enclosed circuit breaker switch, including a frame 10, a circuit breaker assembly 20 mounted on the frame 10, and an isolating switch assembly 30 mounted on the frame 10. The circuit breaker assembly 20 includes three epoxy resin castings 21 mounted on the frame 10, three vacuum interrupters 22 mounted within the three epoxy resin castings 21, three fixed seats 23 respectively mounted in receiving grooves 211 at one end of the three epoxy resin castings 21, a main shaft 24 rotatably mounted on the three fixed seats 23, and three... The cam assembly 25 and the disconnector assembly 30 include an isolation shaft 31 rotatably mounted on the frame 10, three support plates 32 respectively mounted on the lower crossbeam 101 of the frame 10, three isolation blades 33 respectively rotatably mounted on the three support plates 32 and linked with the isolation shaft 31, and three stationary contacts 34 respectively mounted on three epoxy resin castings 21 and electrically connected to three vacuum interrupters 22. The lower crossbeam 101 is provided with isolation protrusions 102 separated between the three support plates 32. The epoxy resin castings 21 are each provided with three insulating covers 212 covering one side of the three stationary contacts 34. Three limiting plates 35 are respectively provided on one side of each of the three stationary contacts 34, and buffer plates 36, which cooperate with the three isolation blades 33, are respectively provided between the three limiting plates 35 and the three stationary contacts 34. The buffer plates buffer the isolation blades, thereby ensuring more reliable contact between the isolation blades and the stationary contacts and extending their mechanical life. The isolation shaft 31 is equipped with three insulating sleeves 311, each fitted onto one of the three isolation blades 33. The insulating sleeves of the isolation shaft are fitted onto the three isolation blades, thereby increasing the insulation distance between the three isolation blades and improving the three-phase insulation performance. The main shaft 24 is equipped with insulating isolation discs 26, each spaced between three epoxy resin castings 21. These insulating isolation discs increase the three-phase insulation distance of the circuit breaker assembly, resulting in better insulation performance.

[0016] like Figure 2 and 3As shown, the frame 10 is equipped with a grounding contact assembly 40 that cooperates with three isolating blades 33. The grounding contact assembly 40 includes a support plate 41 on the frame 10, a grounding conductive busbar 42 on the support plate 41, and three grounding contacts 43 respectively mounted on the grounding conductive busbar 42 and cooperating with the three isolating blades 33. Three buffer pads 44 are respectively provided on the support plate 41 at the locations corresponding to the three grounding contacts 43, cooperating with the three isolating blades 33. The grounding contact assembly adopts a modular structure design, which is beneficial for the modular assembly of the circuit breaker switch. The buffer pads buffer the isolating blades, ensuring reliable contact between the isolating blades and the grounding contacts and reducing damage. Three insulating transparent covers 45 are respectively provided on the support plate 41 at the locations corresponding to the three grounding contacts 43. Each of the three insulating transparent covers 45 has an arc-shaped insulating isolation channel 451 that matches the movement trajectory of the three isolating blades 33. The insulating transparent covers can increase the insulation distance between the three isolating blades, resulting in better three-phase insulation performance. The vacuum interrupter 22 has a flexible connector 27 on its pull rod 221. The mounting base 23 has two fixing holes 231 on each side that mate with the flexible connector 27. The conductive copper busbar 271 of the flexible connector 27 has bolts that connect to the fixing holes 231. The two fixing holes on both sides of the mounting base allow for bidirectional extension of the flexible connector, enabling flexible connection assembly according to user needs and providing greater convenience.

[0017] The circuit breaker switch features three vacuum interrupters housed within epoxy resin castings, employing a fully encapsulated design. This design results in a more compact and smaller structure, improved protection, and enhanced insulation and electrical performance. The epoxy resin castings' insulating covers the stationary contacts, increasing the insulation distance between the three stationary contacts and improving three-phase insulation performance. Furthermore, the circuit breaker assembly and disconnector assembly utilize modular designs, facilitating easier assembly. Therefore, this fully encapsulated circuit breaker switch offers advantages such as simple structure, stable and reliable performance, compact design, small size, high expandability, excellent insulation performance, and high assembly efficiency.

Claims

1. A bottom-isolated, fully enclosed circuit breaker switch, characterized in that: The device includes a frame, a circuit breaker assembly mounted on the frame, and a disconnector assembly mounted on the frame. The circuit breaker assembly includes three epoxy resin castings mounted on the frame, three vacuum interrupters mounted within the three epoxy resin castings, three fixed seats respectively mounted in receiving grooves at one end of the three epoxy resin castings, a main shaft rotatably mounted on the three fixed seats, and three cam assemblies rotatably mounted on the main shaft for driving the three vacuum interrupters to perform opening and closing actions. The disconnector assembly includes an isolation shaft rotatably mounted on the frame, three support plates respectively mounted on the lower crossbeam of the frame, three isolation blades rotatably mounted on the three support plates and linked with the isolation shaft, and three stationary contacts respectively mounted on the three epoxy resin castings and electrically connected to the three vacuum interrupters. The lower crossbeam is provided with isolation protrusions separated between the three support plates, and the epoxy resin castings are provided with three insulating covers covering one side of the three stationary contacts.

2. The fully enclosed, bottom-isolated circuit breaker switch according to claim 1, characterized in that: Three limiting plates are respectively provided on one side of the three stationary contacts, and buffer plates that cooperate with the three isolation blades are respectively provided between the three limiting plates and the three stationary contacts.

3. The fully enclosed, bottom-isolated circuit breaker switch according to claim 1 or 2, characterized in that: The isolation shaft is provided with three insulating sleeves that are fitted onto the three isolation blades.

4. The fully enclosed, bottom-isolated circuit breaker switch according to claim 1 or 2, characterized in that: The main shaft is provided with insulating isolation disks that separate the three epoxy resin castings.

5. The fully enclosed, bottom-isolated circuit breaker switch according to claim 1 or 2, characterized in that: The mechanism frame is provided with a grounding contact assembly that cooperates with three isolation blades. The grounding contact assembly includes a support plate on the mechanism frame, a grounding conductive bus on the support plate, and three grounding contacts respectively disposed on the grounding conductive bus and cooperating with the three isolation blades. The support plate is provided with three buffer pads corresponding to the three grounding contacts and cooperating with the three isolation blades.

6. The fully enclosed, bottom-isolated circuit breaker switch according to claim 5, characterized in that: The support plate is provided with three insulating transparent covers at the three grounding contacts, and each of the three insulating transparent covers is provided with an arc-shaped insulating isolation channel that matches the movement trajectory of the three isolation blades.

7. The fully enclosed, bottom-isolated circuit breaker switch according to claim 1 or 2, characterized in that: The vacuum interrupter is equipped with a flexible connection on its pull rod, and two fixing holes that mate with the flexible connection are respectively provided on both sides of the fixing base. The conductive copper busbar of the flexible connection is equipped with bolts that connect with the fixing holes.

Images