Alternating current double contactor switch cabinet for power distribution system

Abstract

This invention relates to an AC double contactor switchgear for power distribution systems, comprising a cabinet. The internal space of the cabinet is divided by metal partitions into two truck compartments, two instrument compartments, one busbar compartment, and two cable compartments, ensuring the independence of each compartment. The switchgear has two power distribution circuits. The busbar compartment is shared by the upper and lower circuits, enabling a single cabinet to provide two independent, controllable, and safe power distribution circuit systems. Each truck compartment is equipped with a contactor truck, and each truck compartment has a corresponding cabinet door. The truck compartment is equipped with an interlocking mechanism to interlock the contactor truck with the corresponding cabinet door. Each compartment is individually designed with an effective pressure relief structure to ensure internal stability and improve electrical safety. This invention features a simple and highly stable interlocking device, as well as dual independent power distribution circuits and independent pressure relief channels, greatly improving the operational safety of the switchgear.

Description

Technical Field

[0001] This invention relates to the field of power distribution switchgear technology, specifically to an AC double contactor switchgear for power distribution systems. Background Technology

[0002] Dual AC power distribution system contactor cabinets are commonly used in confined spaces such as offshore platforms and underground mines. Their main function is to make full use of space and increase the power distribution capacity within a fixed area. Furthermore, according to national standards, the switchgear must be equipped with safety interlocking mechanisms and pressure relief structures. The interlocking mechanism, as a special component of the contactor cabinet, primarily prevents damage to the switchgear or personal injury caused by operator error, improper operation, or other reasons. The pressure relief structure, as an important part of the contactor cabinet, primarily prevents the spread of localized faults from the contactor cabinet to other areas, reduces damage to the contactor cabinet, and avoids arcing injuries to operators.

[0003] To ensure the personal safety of personnel during maintenance and inspection, the interlock between the switchgear cabinet door and the contactor trolley is crucial. Specifically, when the contactor trolley is in the working position, the cabinet door cannot be opened for safety reasons. The cabinet door can only be opened when the contactor returns to the test position. Therefore, how to achieve a reliable interlock between the cabinet door and the contactor trolley has always been a research hotspot.

[0004] For example, patent CN203415889U discloses a two-hand truck cabinet with a voltage transformer and a surge arrester, which has two power distribution systems and the two power distribution systems share a main bus for power supply.

[0005] However, the internal space planning of this patented switchgear has defects. For example, two sets of power distribution systems share an instrument room for instrument configuration, or share a cable room for wiring. This makes the wiring inside the cabinet extremely messy, making it impossible to reasonably divide the wiring of the two sets of power distribution systems, which is not conducive to later maintenance.

[0006] Furthermore, this patent does not disclose the interlocking device and pressure relief structure, which is not conducive to operational safety; while traditional interlocking mechanisms are usually more complex, occupy more space, and are not very stable.

[0007] Therefore, it is necessary to optimize the internal space of existing dual AC power distribution switchgear and design an interlocking device and pressure relief structure suitable for this type of switchgear internal space to ensure the safety of power distribution operation. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides an AC double contactor switchgear for power distribution systems. It features a simple structure, a highly stable interlocking device, and two independent power distribution circuits and an independent pressure relief channel, which greatly improves the safety of switchgear operation.

[0009] This invention is achieved through the following technical solution: an AC double contactor switch cabinet for a power distribution system, comprising a cabinet body, a handcart compartment inside the cabinet body, a contactor handcart inside the handcart compartment, and a cabinet door corresponding to the handcart compartment. The handcart compartment is provided with an interlocking mechanism, the interlocking mechanism including a locking rod extending along the moving direction of the contactor handcart, the locking rod being rotatably installed on the inner bottom of the handcart compartment, the upper part of the locking rod having a sliding groove along its length, the sliding groove including a straight groove and an inclined groove, and a sliding block fixedly provided along the sliding groove at the bottom of the contactor handcart. The cabinet door has a blind hole on the inside for inserting the outer end of the locking rod. The inner wall of the blind hole has an annular groove, and the outer end of the blind hole has a notch that communicates with the annular groove. The outer end of the locking rod is fixed with a locking block that can be inserted into the notch. When the locking rod is inserted into the blind hole, the locking block passes through the notch and is accommodated in the annular groove. When the contactor trolley is in the working position, the locking block is located in the straight groove and the locking block is misaligned with the notch; during the process of the contactor trolley retracting from the working position to the test position, the locking block slides into the inclined groove along the straight groove, causing the locking rod to rotate; when the contactor trolley is in the test position, the locking block is located in the inclined groove and the locking block is aligned with the notch.

[0010] As an optimization, the straight groove and the inclined groove are connected by a circular arc transition. This optimization allows the slider to pass more smoothly when entering the inclined groove from the straight groove, reducing resistance.

[0011] As an optimization, the slider includes a vertical cylindrical block and a connecting plate fixed to the top of the cylindrical block. Bolt holes are provided on the connecting plate, and the diameter of the cylindrical block is adapted to the width of the groove. This optimization facilitates the fixing of the cylindrical block to the contactor trolley via the connecting plate. Furthermore, the cylindrical structure offers less resistance, allowing for smoother sliding within the groove.

[0012] As an optimization, a protrusion is fixedly attached to the inner wall of the cabinet door, and the blind hole is made on the protrusion. This optimization is useful because cabinet doors are usually made of thin plates that are not easy to drill holes in; therefore, a separate protrusion is fixed to the cabinet door to facilitate drilling.

[0013] As an optimization, the handcart compartment includes an upper handcart compartment and a lower handcart compartment arranged vertically. The cabinet has two doors, one for the upper handcart compartment and one for the lower handcart compartment. Both the upper handcart compartment and the lower handcart compartment are equipped with the contactor handcart and the interlocking mechanism. This optimization provides separate interlocking mechanisms for the two handcart compartments, which are independent of each other and do not affect each other.

[0014] As an optimization, the upper handcar compartment is divided into an upper instrument compartment, and the lower handcar compartment is divided into a lower instrument compartment. This optimization provides instrument compartments in both handcar compartments for instrument installation, making it easier for personnel to quickly and accurately identify and read the instruments, and preventing messy wiring.

[0015] As an optimization, the top of the cabinet is provided with a first pressure relief channel that connects to the working car compartment, and the first pressure relief channel is closed by a first convex pressure relief cover plate; The upper compartment is divided by a partition into a second pressure relief channel. The second pressure relief channel extends vertically, with its lower end connected to the lower compartment and its upper end connected to the top of the cabinet. The second pressure relief channel is closed by a second convex pressure relief cover plate.

[0016] In the event of a fault, this optimization releases the electric arc in the operator's compartment through the first pressure relief channel, thus relieving pressure. The electric arc in the lower operator's compartment is guided upwards through the arc ignition channel, preventing it from affecting the operator's compartment and thus avoiding further accident escalation and ensuring operator safety.

[0017] As an optimization, the cabinet also includes a cable compartment and a busbar compartment. The cable compartment is located behind the handcart compartment and includes an upper cable compartment and a lower cable compartment arranged vertically. The busbar compartment is located between the cable compartment and the handcart compartment. This optimization sets up two cable compartments for the wiring of two power distribution circuits respectively. The reasonable division of wiring is more organized and clear, avoiding confusion and facilitating later maintenance.

[0018] As an optimization, the cabinet is provided with a third pressure relief channel, a fourth pressure relief channel and a fifth pressure relief channel that respectively connect the upper cable compartment, the lower cable compartment and the busbar compartment. The third pressure relief channel, the fourth pressure relief channel and the fifth pressure relief channel are respectively closed by a third convex pressure relief cover plate, a fourth convex pressure relief cover plate and a fifth convex pressure relief cover plate.

[0019] This optimization includes pressure relief ports in each chamber to release pressure, ensuring the safety of each chamber.

[0020] As an optimization, the busbar room is equipped with a main busbar, and the upper cable room and the lower cable room are respectively equipped with an upper current transformer and a lower current transformer. The main busbar, the contact box of the contactor truck in the upper cab, and the upper current transformer are connected in series through the branch busbar to form the upper power distribution circuit. The main busbar, the contact box of the contactor truck in the lower handcart compartment, and the lower current transformer are connected in series through branch busbars to form the lower-level power distribution circuit.

[0021] This optimization enables a single cabinet to provide two independent, controllable, and safe power distribution circuit systems, allowing one cabinet to replace the functions of two cabinets, saving space and ensuring safety and reliability.

[0022] The beneficial effects of this invention are as follows: 1. By rationally planning the internal space of the cabinet, it is divided into two handcart compartments, two instrument compartments, one busbar compartment, and two cable compartments. Each compartment is separated by a metal partition to ensure their independence. Two independent and controllable power distribution circuits are formed through wiring between the compartments. The two power distribution circuits share a main busbar, making full use of the cabinet space and increasing the power distribution capacity within the fixed space. Furthermore, the two power distribution circuits can be clearly distinguished, effectively avoiding messy wiring and facilitating later maintenance.

[0023] 2. Each chamber is designed with an effective pressure relief structure to ensure internal stability and improve electrical safety.

[0024] 3. Each of the two handcart compartments is equipped with a cabinet door. Through their respective interlocking mechanisms, the contactor handcarts in the handcart compartments are independently interlocked with the corresponding cabinet doors, ensuring the personal safety of personnel during maintenance and inspection.

[0025] 4. This interlocking mechanism uses the movement of the contactor trolley to drive the movement of the bottom slider, causing the slider to slide along the groove, which in turn drives the locking rod to rotate. When the contactor trolley switches between the working and experimental positions, the rotation of the locking rod causes the locking block at its end to engage or disengage with the annular groove on the cabinet door, thus controlling the opening and closing of the cabinet door. This interlocking mechanism has the advantages of simple structure, small footprint, low cost, and high stability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the internal structure of the cabinet; Figure 2 This is a schematic diagram of the locking rod and the slider. Figure 3 This is a partial sectional view of the locking bar and the protrusion; Figure 4 This is a schematic diagram showing the connection between the protrusion and the cabinet door; Figure 5 This is a side sectional view of the locking bar and the protrusion; Figure 6 This is a schematic diagram of the cabinet's three-dimensional structure; As shown in the figure: 1. Cabinet body; 11. Cabinet door; 12. Upper handling compartment; 13. Lower handling compartment; 14. Upper instrument compartment; 15. Lower instrument compartment; 16. Busbar compartment; 17. Upper cable compartment; 18. Lower cable compartment. 2. Contactor trolley; 21. Upper contact box of the trolley; 22. Lower contact box of the trolley; 3. Interlocking mechanism; 31. Locking rod; 32. Bearing seat; 33. Slide groove; 331. Straight groove; 332. Inclined groove; 34. Locking block; 35. Sliding block; 351. Cylindrical block; 352. Connecting plate; 36. Protrusion; 37. Blind hole; 38. Annular groove; 39. Notch. 4. Main busbar; 5. Upper current transformer; 6. Lower current transformer; 7. First pressure relief channel; 71. First convex pressure relief cover plate; 8. Third pressure relief channel; 81. Third convex pressure relief cover plate; 9. Fifth pressure relief channel; 91. Fifth convex pressure relief cover plate; 10. Second pressure relief channel; 101. Second convex pressure relief cover plate. Detailed Implementation

[0027] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0028] like Figures 1-6 As shown, an AC double contactor switch cabinet for a power distribution system includes a cabinet body 1, a handcart compartment inside the cabinet body 1, a contactor handcart 2 inside the handcart compartment, and a cabinet door 11 corresponding to the handcart compartment. The contactor handcart 2 is moved within the handcart compartment to switch between a working position and a test position. The cabinet door 11 is located in the direction of movement of the contactor handcart 2. Typically, the contactor handcart 2 is electrically driven, and its movement can be controlled by a controller. When the contactor handcart 2 moves closer to the cabinet door 11, it switches to the test position; when the contactor handcart 2 moves away from the cabinet door 11, it switches to the working position. This is existing technology and will not be described in detail here.

[0029] The handcart compartment is equipped with an interlocking mechanism 3, which is used to interlock the contactor handcart 2 with the cabinet door 11. That is, when the contactor handcart 2 is in the working position, the cabinet door 11 cannot be opened for safety reasons, and the cabinet door 11 can only be opened when the contactor returns to the test position.

[0030] The handcart compartment described in this embodiment includes an upper handcart compartment 12 and a lower handcart compartment 13, which are arranged vertically and separated by a metal partition. The cabinet 1 has two doors 11, corresponding to the upper handcart compartment 12 and the lower handcart compartment 13 respectively. Both the upper handcart compartment 12 and the lower handcart compartment 13 are equipped with the contactor handcart 2 and the interlocking mechanism 3. That is, each handcart compartment has a door 11, and through their respective interlocking mechanisms 3, the contactor handcart 2 inside each handcart compartment is independently interlocked with its corresponding door 11.

[0031] Specifically, the interlocking mechanism 3 includes a locking rod 31 extending along the moving direction of the contactor truck 2, and the locking rod 31 is rotatably mounted on the inner bottom of the truck compartment. Figure 2As shown, in this embodiment, the locking rod 31 is a round rod. The locking rod 31 of the interlocking mechanism 3 in the upper handling compartment 12 is rotatably mounted on the bottom plate of the upper handling compartment 12 via a bearing seat 32, and this locking rod 31 is located directly below the contactor truck 2 in the upper handling compartment 12. The locking rod 31 of the interlocking mechanism 3 in the lower handling compartment 13 is rotatably mounted on the bottom plate of the lower handling compartment 13 via a bearing seat 32, and this locking rod 31 is located directly below the contactor truck 2 in the lower handling compartment 13.

[0032] The upper part of the locking rod 31 has a sliding groove 33 along its length. The sliding groove 33 includes a straight groove 331 and an inclined groove 332. A sliding block 35 that slides along the sliding groove 33 is fixed to the bottom of the contactor trolley 2. The sliding groove 33 is as follows: Figure 2 As shown, the straight groove portion 331 extends axially along the locking rod 31. The end of the straight groove portion 331 near the cabinet door 11 extends obliquely along the circumference of the locking rod 31 to form the inclined groove portion 332. In this embodiment, the straight groove 331 and the inclined groove 332 are connected by a circular arc transition. When the slider 35 enters the inclined groove 332 from the straight groove 331, the circular arc transition makes the slider 35 turn more smoothly and reduces resistance.

[0033] The slider 35 described in this embodiment is as follows: Figure 2 As shown, the slider 35 includes a vertical cylindrical block 351 and a connecting plate 352 fixed to the top of the cylindrical block 351. The connecting plate 352 has bolt holes, and the diameter of the cylindrical block 351 matches the width of the slide groove 33. During installation, the connecting plate 352 is fixed to the bottom of the contactor trolley 2 with bolts, facilitating assembly and disassembly. After the slider 35 is installed and fixed, its cylindrical block 351 can be inserted precisely into the slide groove 33. Thus, when the contactor trolley 2 moves, the cylindrical block 351 can slide along the slide groove 33. The cylindrical structure has less resistance and allows for smoother sliding within the slide groove 33.

[0034] like Figures 3-5 As shown, the cabinet door 11 has a blind hole 37 on its inner side for inserting the outer end of the locking rod 31. The inner wall of the blind hole 37 has an annular groove 38, and the outer end of the blind hole 37 has a notch 39 communicating with the annular groove 38. The outer end of the locking rod 31 is fixed with a locking block 34 that can be inserted into the notch 39. When the locking rod 31 is inserted into the blind hole 37, the locking block 34 passes through the notch 39 and is accommodated in the annular groove 38.

[0035] Since a typical cabinet door 11 is only a thin plate, it is impossible to drill a blind hole 37. Therefore, in this embodiment, a protrusion 36 is fixedly attached to the inner wall of the cabinet door 11, and the blind hole 37 is formed on the protrusion 36. The individual protrusion 36 is fixedly attached to the cabinet door 11, facilitating the drilling of the hole. Figure 4As shown, in this embodiment, the protrusion 36 is a circular block, and the blind hole 37 is formed at the center of the protrusion 36. The annular groove 38 is formed at the inner end of the blind hole 37, that is, the blind hole 37 and the annular groove 38 are connected, and the outer diameter of the blind hole 37 is the inner diameter of the annular groove 38. The outer diameter of the annular groove 38 should be greater than the rotation diameter of the locking block 34, that is, when the locking rod 31 rotates, the locking block 34 can rotate in the annular groove 38.

[0036] like Figure 3 As shown, the locking block 34 in this embodiment is a rectangular block, which is fixed to the outer wall of the locking rod 31 near the cabinet door 11. The notch 39 is located above and communicates with the blind hole 37, and extends from the outer end of the protrusion 36 inward to the annular groove 38. The notch 39 is a rectangular opening, and its size should be larger than that of the locking block 34 so that the locking block 34 can enter the annular groove 38 through the notch 39.

[0037] It should be noted that when the cabinet door 11 is closed, the locking rod 31 and the protrusion 36 are coaxially aligned, and the locking rod 31 is inserted into the blind hole 37, causing the locking block 34 to be accommodated in the annular groove 38. Thus, when the locking block 34 is misaligned with the notch 39, the locking block 34 engages in the annular groove 38, preventing the locking rod 31 from being pulled out of the blind hole 37. This achieves the locking of the locking rod 31 and the protrusion 36, preventing the cabinet door 11 from opening. Only when the locking block 34 aligns with the notch 39 can the locking block 34 disengage from the annular groove 38, at which point the locking rod 31 can separate from the protrusion 36, allowing the cabinet door 11 to open.

[0038] The interlocking principle between the contactor trolley 2 and the cabinet door 11 in this embodiment is as follows: When the contactor trolley 2 is in the working position, the locking block is located in the straight groove 331, and the locking block is offset from the notch 39. When the contactor trolley 2 is in the experimental position, the locking block is located in the inclined groove 332, and the locking block is aligned with the notch 39.

[0039] During the process of the contactor trolley 2 retracting from the working position to the test position, the locking block slides into the inclined groove 332 along the straight groove 331, causing the locking rod 31 to rotate; conversely, during the process of the contactor trolley 2 moving from the test position to the working position, the locking block slides into the straight groove 331 from the inclined groove 332, causing the locking rod 31 to rotate in the opposite direction.

[0040] like Figure 3 , 5 As shown, when the slider 35 slides into contact with the straight groove 331, the straight groove 331 faces upward. Since the notch 39 is located above the blind hole 37, in order to ensure that the locking block 34 and the notch 39 are misaligned at this time, the locking block 34 is offset to one side when the straight groove 331 faces upward, that is, the locking block 34 and the straight groove 331 are also misaligned, so as to ensure that the cabinet door 11 cannot be opened in this state.

[0041] As the contactor trolley 2 retracts from the working position to the test position, the slider 35 gradually slides from the straight groove 331 into the inclined groove 332. When the slider 35 reaches the inflection point between the straight groove 331 and the inclined groove 332, it will encounter resistance. As the contactor trolley 2 moves and continues to apply force, the slider 35 will press against the inner wall of one side of the inclined groove 332, thereby driving the locking rod 31 to rotate, which in turn drives the locking block 34 to rotate.

[0042] In this embodiment, when the contactor trolley 2 reaches the test position, the locking block 34 also reaches the end of the inclined groove 332. At this time, the locking block 34 is positioned above the locking rod 31 and aligned with the notch 39. The locking rod 31 can then separate from the protrusion 36, and the cabinet door 11 can be opened. Therefore, the length of the rotation path of the locking block 34 should be adapted to the length of the inclined groove 332 so that when the contactor trolley 2 reaches the test position, the locking block 34 is aligned with the notch 39.

[0043] Conversely, when the cabinet door 11 is closed, the locking rod 31 is inserted into the blind hole 37 again. During the process of the contactor trolley 2 moving from the test position to the working position, the slider 35 gradually slides from the inclined groove 332 into the straight groove 331. At this time, the slider 35 drives the locking rod 31 to reverse, causing the locking block 34 to be misaligned with the notch 39. When the slider 35 enters the straight groove 331, the locking rod 31 no longer rotates. At this time, the locking rod 31 is locked with the protrusion 36 again, and the cabinet door 11 cannot be opened.

[0044] The cabinet 1 also includes a cable compartment and a busbar compartment 16. The cable compartment is located behind the handcart compartment and includes an upper cable compartment 17 and a lower cable compartment 18, which are arranged vertically. The busbar compartment 16 is located between the cable compartment and the handcart compartment. That is, the handcart compartment, busbar compartment 16, and cable compartment are arranged sequentially from front to back. The upper handcart compartment 12 is equipped with an upper instrument compartment 14, and the lower handcart compartment 13 is equipped with a lower instrument compartment 15. The two handcart compartments are equipped with instrument compartments to install instruments, which allows personnel to quickly and accurately identify and read the information of the corresponding power distribution circuit.

[0045] Since the handcart compartment is located at the front of cabinet 1, two doors 11 are provided on the front wall of cabinet 1, corresponding to the upper handcart compartment 12 and the lower handcart compartment 13 respectively. Since the cable compartment is located at the rear of cabinet 1, two inspection doors are provided on the rear wall of cabinet 1, corresponding to the upper cable compartment 17 and the lower cable compartment 18 respectively, facilitating independent inspection and maintenance. To facilitate wiring to the busbar compartment 16, personnel can consider providing a door corresponding to the busbar compartment 16 on the left or right wall of cabinet 1; this is a standard arrangement and will not be elaborated upon here.

[0046] The main busbar 4 is located in the busbar compartment 16, and the upper current transformer 5 and lower current transformer 6 are located in the upper cable compartment 17 and lower cable compartment 18, respectively. The main busbar 4, the contact box of the contactor cart 2 in the upper handcart compartment 12, and the upper current transformer 5 are connected in series via branch busbars to form an upper-level power distribution circuit. The main busbar 4, the contact box of the contactor cart 2 in the lower handcart compartment 13, and the lower current transformer 6 are connected in series via branch busbars to form a lower-level power distribution circuit.

[0047] Specifically, such as Figure 1 As shown, the contactor of the contactor cart 2 has two contact boxes, namely the upper contact box 21 and the lower contact box 22. The main busbar 4 is used for power supply.

[0048] The main busbar 4 is connected to the lower contact box 22 of the contactor truck 2 in the upper truck compartment 12 via a branch busbar. The upper contact box 21 of the contactor truck 2 in the upper truck compartment 12 is connected to the upper current transformer 5 via a branch busbar. Finally, the upper cable compartment 17 is used to form the upper power distribution circuit.

[0049] The main busbar 4 is connected to the upper contact box 21 of the contactor truck 2 in the lower truck compartment 13 via a branch busbar. The lower contact box 22 of the contactor truck 2 in the lower truck compartment 13 is connected to the lower current transformer 6 via a branch busbar. Finally, the lower cable compartment 18 is used to form the lower power distribution circuit.

[0050] Preferably, the two ends of the branch busbar are bolted to the main busbar 4, the contact box, and the current transformer, respectively.

[0051] In summary, cabinet 1 is assembled from multiple-bent sheet metal using riveting and bolting. The internal space of cabinet 1 is divided by metal partitions into two handcart compartments, two instrument compartments, one busbar compartment 16, and two cable compartments, ensuring the independence of each compartment. The switchgear has two power distribution circuits, with busbar compartment 16 shared by both upper and lower circuits. This allows a single cabinet 1 to provide two independent, controllable, and safe power distribution circuit systems. Furthermore, the two layers of power distribution circuits are routed separately, avoiding messy wiring, facilitating future maintenance, and ensuring safety and reliability.

[0052] In this embodiment, the top of the cabinet 1 is provided with a first pressure relief channel 7 that connects to the upper handling compartment 12. The first pressure relief channel 7 is closed by a first convex pressure relief cover plate 71.

[0053] In this embodiment, the upper operating compartment 12 is divided by a partition into a second pressure relief channel 10. The second pressure relief channel 10 extends vertically, with its lower end communicating with the lower operating compartment 13 and its upper end extending to and communicating with the top of the cabinet 1. The second pressure relief channel 10 is sealed by a second convex pressure relief cover plate 101. In other words, the second pressure relief channel 10 is an independent channel isolated within the upper operating compartment 12 by a metal partition. In case of a fault, the electric arc in the lower operating compartment 13 is guided upwards through the second pressure relief channel, preventing it from affecting the upper operating compartment 12, and is discharged through the second pressure relief channel, thus avoiding the escalation of the accident and ensuring the safety of the operators.

[0054] The cabinet 1 described in this embodiment is also provided with a third pressure relief channel 8, a fourth pressure relief channel and a fifth pressure relief channel 9 that are respectively connected to the upper cable chamber 17, the lower cable chamber 18 and the busbar chamber 16. The third pressure relief channel 8, the fourth pressure relief channel and the fifth pressure relief channel 9 are respectively closed by a third convex pressure relief cover plate 81, a fourth convex pressure relief cover plate and a fifth convex pressure relief cover plate 91.

[0055] The third pressure relief channel 8 and the fifth pressure relief channel 9 are located at the top of the cabinet 1, and the fourth pressure relief channel is located on the side wall of the cabinet 1.

[0056] In summary, each chamber is equipped with a corresponding pressure relief port. Pressure can be released by opening the corresponding pressure relief cover, ensuring the safety of each chamber. By designing two independent power distribution circuits within a single cabinet 1 and by designing an individual and effective pressure relief structure for each compartment, one cabinet can replace the function of two cabinets, preventing misoperation, ensuring operator safety, and providing multiple collaborative protection functions.

[0057] Working principle: When the contactor trolley 2 is in the working position, that is, when the contactor trolley 2 is away from the cabinet door 11, the slider 35 at the bottom of the contactor trolley 2 is located in the straight groove 331, that is, the straight groove 331 is facing upward. At this time, the locking rod 31 is inserted into the blind hole 37 of the protrusion 36, and the locking block 34 is located in the annular groove 38 and is misaligned with the notch 39.

[0058] As the contactor trolley 2 retracts from the working position to the test position, that is, as the contactor trolley 2 moves closer to the cabinet door 11, the slider 35 gradually slides from the straight groove 331 into the inclined groove 332. When the slider 35 reaches the inflection point between the straight groove 331 and the inclined groove 332, the slider 35 will encounter resistance. As the contactor trolley 2 moves and continues to apply force, the slider 35 will press against one side of the inner wall of the inclined groove 332, thereby driving the locking rod 31 to rotate, which in turn causes the locking block 34 to rotate within the annular groove 38. When the contactor trolley 2 reaches the test position, the locking block 34 is aligned with the notch 39, so the locking rod 31 can separate from the protrusion 36, and the cabinet door 11 can be opened.

[0059] When the cabinet door 11 closes again, the locking rod 31 is inserted into the blind hole 37 again. During the process of the contactor trolley 2 moving from the test position to the working position, the slider 35 gradually slides from the inclined groove 332 into the straight groove 331. During this process, the slider 35 drives the locking rod 31 to reverse, causing the locking block 34 to rotate in the opposite direction and misalign with the notch 39 again. When the slider 35 enters the straight groove 331, the locking rod 31 stops rotating. At this time, the locking rod 31 locks with the protrusion 36 again, and the cabinet door 11 cannot be opened, thus achieving the interlock between the cabinet door 11 and the contactor trolley 2.

[0060] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. An AC double contactor switch cabinet for a power distribution system, comprising a cabinet (1), wherein a handcart compartment is provided inside the cabinet (1), a contactor handcart (2) is provided inside the handcart compartment, and the cabinet (1) is provided with a cabinet door (11) corresponding to the handcart compartment, characterized in that: The handcart compartment is provided with an interlocking mechanism (3), which includes a locking rod (31) extending along the moving direction of the contactor handcart (2). The locking rod (31) is rotatably installed on the inner bottom of the handcart compartment. The upper part of the locking rod (31) has a sliding groove (33) along the length direction. The sliding groove (33) includes a straight groove (331) and an inclined groove (332). The bottom of the contactor handcart (2) is fixed with a sliding block (35) that slides along the sliding groove (33). The cabinet door (11) has a blind hole (37) on its inner side for inserting the outer end of the locking rod (31). The inner wall of the blind hole (37) has an annular groove (38). The outer end of the blind hole (37) has a notch (39) that communicates with the annular groove (38). The outer end of the locking rod (31) is fixed with a locking block (34) that can be inserted into the notch (39). When the locking rod (31) is inserted into the blind hole (37), the locking block (34) passes through the notch (39) and is accommodated in the annular groove (38). When the contactor trolley (2) is in the working position, the locking block is located in the straight groove (331) and the locking block is misaligned with the notch (39); during the process of the contactor trolley (2) returning from the working position to the test position, the locking block slides into the inclined groove (332) along the straight groove (331) to make the locking rod (31) rotate; when the contactor trolley (2) is in the test position, the locking block is located in the inclined groove (332) and the locking block is aligned with the notch (39).

2. The AC double contactor switchgear for power distribution systems according to claim 1, characterized in that: The straight groove (331) and the inclined groove (332) are connected by a circular arc transition.

3. The AC double contactor switchgear for power distribution systems according to claim 2, characterized in that: The slider (35) includes a vertical cylindrical block (351) and a connecting plate (352) fixed to the top of the cylindrical block (351). The connecting plate (352) has bolt holes, and the diameter of the cylindrical block (351) is adapted to the width of the groove (33).

4. The AC double contactor switchgear for power distribution systems according to claim 1, characterized in that: A protrusion (36) is fixed to the inner wall of the cabinet door (11), and the blind hole (37) is opened on the protrusion (36).

5. The AC double contactor switchgear for power distribution systems according to any one of claims 1 to 4, characterized in that: The handcart compartment includes an upper handcart compartment (12) and a lower handcart compartment (13) arranged in a vertically separated manner. The cabinet (1) is provided with two cabinet doors (11), which correspond to the upper handcart compartment (12) and the lower handcart compartment (13) respectively. The contactor handcart (2) and the interlocking mechanism (3) are provided in both the upper handcart compartment (12) and the lower handcart compartment (13).

6. The AC double contactor switchgear for power distribution systems according to claim 5, characterized in that: The upper instrument room (14) is located inside the upper driver's compartment (12), and the lower instrument room (15) is located inside the lower driver's compartment (13).

7. The AC double contactor switchgear for power distribution systems according to claim 5, characterized in that: The cabinet (1) is provided with a first pressure relief channel (7) at the top, which connects to the upper handling compartment (12). The first pressure relief channel (7) is closed by a first convex pressure relief cover plate (71). The upper handling compartment (12) is divided by a partition into a second pressure relief channel (10). The second pressure relief channel (10) extends vertically, and its lower end is connected to the lower handling compartment (13). Its upper end is connected to the top of the cabinet (1). The second pressure relief channel (10) is closed by a second convex pressure relief cover plate (101).

8. The AC double contactor switchgear for power distribution systems according to claim 5, characterized in that: The cabinet (1) is also equipped with a cable compartment and a busbar compartment (16). The cable compartment is located behind the handcart compartment. The cable compartment includes an upper cable compartment (17) and a lower cable compartment (18) arranged separately. The busbar compartment (16) is located between the cable compartment and the handcart compartment.

9. The AC double contactor switchgear for power distribution systems according to claim 8, characterized in that: The cabinet (1) is provided with a third pressure relief channel (8), a fourth pressure relief channel and a fifth pressure relief channel (9) that respectively connect the upper cable chamber (17), the lower cable chamber (18) and the busbar chamber (16). The third pressure relief channel (8), the fourth pressure relief channel and the fifth pressure relief channel (9) are respectively closed by a third convex pressure relief cover plate (81), a fourth convex pressure relief cover plate and a fifth convex pressure relief cover plate (91).

10. The AC double contactor switchgear for power distribution systems according to claim 8, characterized in that: The busbar compartment (16) is equipped with a main busbar (4), and the upper cable compartment (17) and the lower cable compartment (18) are equipped with an upper current transformer (5) and a lower current transformer (6), respectively. The main busbar (4), the contact box of the contactor truck (2) in the upper truck compartment (12), and the upper current transformer (5) are connected in series through the branch busbar to form the upper power distribution circuit; The main busbar (4), the contact box of the contactor cart (2) in the lower handcart compartment (13), and the lower current transformer (6) are connected in series through the branch busbar to form the lower power distribution circuit.

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