AC double circuit breaker switchgear for power transmission system

Abstract

The present invention discloses an AC double circuit breaker switchgear for a power transmission system, which relates to the field of switchgear interlocking structures. The switchgear comprises a cabinet body, a trolley compartment provided in the cabinet body, a trolley-type second circuit breaker provided in the trolley compartment, and a interlocking device provided between a door of the trolley compartment and the second circuit breaker. When the door of the trolley compartment is closed, a safety device releases the lock on the second circuit breaker, and the second circuit breaker can be driven inward by a driving device. As the second circuit breaker moves inward, the door is locked by the interlocking device and cannot be opened. When the door is released and opened, the driving device becomes inoperative, and the safety device locks the second circuit breaker. The safety of the switchgear is achieved through the cooperation of multiple devices. The switchgear has a simple structure, high stability, and multiple coordinated protection functions.

Description

Technical Field

[0001] The present invention relates to the field of switch cabinet interlocking structures, and in particular to an AC double circuit breaker switch cabinet for a power transmission system. Background Art

[0002] In switchgear engineering applications, to ensure the personal safety of workers during maintenance and inspection, interlocking is required between different components of the DC switchgear. For example, the interlocking between the cabinet door and the circuit breaker trolley is very important. Specifically, when the circuit breaker trolley is in the working position, the cabinet door cannot be opened for safety reasons. The cabinet door can only be opened when the circuit breaker is returned to the test position. Therefore, how to achieve reliable interlocking between the cabinet door and the circuit breaker trolley has always been a hot research topic.

[0003] Low-frequency transmission system switchgear is also used in marine power generation lines. According to national standards, the switchgear needs to be equipped with an interlocking mechanism to ensure safety. As a special component of the switchgear, the interlocking structure mainly prevents operators from damaging the switchgear equipment or causing personal injury due to misoperation, improper operation or other reasons.

[0004] The existing chain structures are relatively complex and unstable, and most of them do not have multiple coordinated protection functions. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an AC double circuit breaker switch cabinet for a power transmission system with an interlocking device having a simple structure and high stability.

[0006] In order to solve the above technical problems, the present invention includes a cabinet, a trolley room is provided in the cabinet, a trolley-type second circuit breaker is provided in the trolley room, a locking device is provided between the door of the trolley room and the second circuit breaker, the locking device includes a locking rod provided along the moving direction of the second circuit breaker, the locking rod is provided at the bottom of the trolley room through an axle seat, a slide groove is provided on the upper part of the locking rod along the length direction, a slider matching the slide groove is fixedly provided at the bottom of the second circuit breaker, a blind hole is provided at the outer end of the door corresponding to the locking rod, an annular groove is provided on the inner wall of the blind hole, and a ring groove is provided on the outer end of the blind hole. The notch is connected to the annular groove, and a locking block is fixedly provided on one side of the outer end of the locking rod. When the locking block is aligned with the notch, the outer end of the locking rod can extend into the blind hole. The slide groove is divided into a straight groove part and an oblique groove part. When the second circuit breaker moves close to the chamber door, the slider moves to the oblique groove part position to drive the locking rod to rotate a certain angle. At this time, the locking block is aligned with the notch, the lock of the chamber door is released, and the chamber door can be opened. A driving device is provided between the chamber door of the trolley chamber and the second circuit breaker. When the chamber door is in a closed state, the driving device can drive the second circuit breaker to move in the trolley chamber.

[0007] Preferably, the driving device includes a handwheel mounted on the chamber door, the inner end of the handwheel shaft extends into the interior of the trolley chamber, a screw rod parallel to the locking rod is installed in the trolley chamber through an axle seat, a driving block matching the thread is provided at the bottom of the second circuit breaker, and a card-matching structure is provided between the outer end of the screw rod and the inner end of the handwheel shaft. When the chamber door is closed, the outer end of the screw rod and the inner end of the handwheel shaft are connected through the card-matching structure.

[0008] A preferred design is that a safety device is provided between the compartment door and the second circuit breaker, the safety device includes a strip plate provided at both sides of the bottom of the trolley compartment corresponding to the second circuit breaker, the roller of the second circuit breaker is located on the upper side of the strip plate, a bracket is fixedly provided on one side of the upper side of the strip plate, a vertical rod is provided on the inner side of the bracket, a sliding sleeve is provided on the outer side of the vertical rod, the sliding sleeve is fixedly connected to the bracket, the upper end of the vertical rod is hingedly connected to the bottom of the cross rod, the outer end of the cross rod is hingedly connected to the upper end of the bracket, a long strip plate parallel to the screw rod is fixedly installed on the lower side of the inner end of the cross rod, a plurality of evenly distributed slots are provided at the bottom of the long strip plate along the length direction, and the axis of the roller of the second circuit breaker can be aligned with one of them The slot is engaged, and a through hole parallel to the screw rod is provided at the lower end position of the vertical rod corresponding to the strip plate. A push rod is provided in the through hole, and a first inclined surface is provided at the inner end of the push rod. The lower end of the vertical rod extends into the through hole and is provided with a second inclined surface matching the first inclined surface. The vertical rod and the sliding sleeve are connected by a first spring, and the push rod and the outer end of the through hole are connected by a second spring. A push rod is provided between the inner side of the chamber door and the outer end of the push rod. When the chamber door is closed, the push rod pushes the push rod inward. Through the cooperation of the first inclined surface and the second inclined surface, the vertical rod moves up, and the inner end of the cross rod moves up under the drive of the vertical rod, driving the long strip plate to rise. At this time, the axis of the roller of the second circuit breaker is separated from the slot.

[0009] To further improve safety and avoid misoperation, the locking structure includes several holes of different sizes at the outer end of the screw rod, and the inner end of the handwheel shaft is provided with a protrusion of corresponding size corresponding to the hole slot.

[0010] Furthermore, a busbar room, a cable room, an instrument room, and a first circuit breaker room are also provided in the cabinet.

[0011] Furthermore, the instrument room is located on the upper side of the first circuit breaker room, the trolley room is located on the lower side of the first circuit breaker room, the busbar room and the cable room are located on the rear side of the trolley room, and the cable room is located on the lower side of the busbar room.

[0012] Furthermore, a three-phase main bus is provided in the busbar chamber, a first circuit breaker is provided in the first circuit breaker chamber, and a closing resistor is provided in parallel with the first circuit breaker in the busbar chamber.

[0013] Furthermore, a transformer and a grounding switch are provided in the cable room, an upper contact box and a lower contact box are provided in the busbar room and the cable room respectively, openings corresponding to the upper contact box and the lower contact box are opened on the side wall of the trolley room, the two contact arms of the second circuit breaker correspond to the upper contact box and the lower contact box respectively, the upper contact box is connected to the three-phase main bus through the first circuit breaker, the lower contact box is connected to the transformer, and the transformer is connected to the grounding switch.

[0014] To sum up, the working principle of the present invention is that when the door of the trolley room is closed, the safety device releases the lock on the second circuit breaker, and the second circuit breaker can be driven to move inward by the driving device. As the second circuit breaker moves inward, the door is locked by the interlocking device, and finally the two contact arms of the second circuit breaker are plugged into the upper contact box and the lower contact box to complete the closing. In this state, the door cannot be opened to ensure safety. The second circuit breaker is driven to move outward to the extreme position by the driving device, and the two contact arms of the second circuit breaker are separated from the upper contact box and the lower contact box. The interlocking device releases the lock on the door, and the door can be opened at this time. When the door is opened, the driving device cannot work, and the safety device locks the second circuit breaker. The safety of the switch cabinet is achieved through the cooperation of multiple devices. The structure is simple, the stability is high, and it has multiple coordinated protection functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0016] Figure 1 It is a schematic diagram of the overall internal structure of the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure of part I;

[0018] Figure 3 It is a partial structural diagram of the safety device of the present invention;

[0019] Figure 4 This is a schematic diagram of the top view of the structure of the door and the interlocking device of the present invention;

[0020] Figure 5 This is a schematic diagram of the shaft matching between the long plate and the roller of the second circuit breaker of the present invention;

[0021] Figure 6 Schematic diagram of the matching structure of the first inclined surface and the second inclined surface;

[0022] Figure 7 This is a schematic diagram of the door cross-section direction and the locking rod matching structure;

[0023] Figure 8 This is a schematic diagram of the structure of the inner side of the door and the locking rod;

[0024] Figure 9 for Figure 4 A schematic diagram of the partially enlarged structure of part II;

[0025] Figure 10 for Figure 4 Schematic diagram of the locally enlarged structure of Part III. DETAILED DESCRIPTION

[0026] Refer to the attached Figure 1-10 The AC double circuit breaker switch cabinet for a power transmission system includes a cabinet body, in which a trolley room 1, a busbar room 2, a cable room 3, an instrument room 4, and a first circuit breaker room 5 are distributed. The instrument room 4 is located on the upper side of the first circuit breaker room 5, the trolley room 1 is located on the lower side of the first circuit breaker room, the busbar room and the cable room are located on the rear side of the trolley type, the cable room is located on the lower side of the busbar room, a three-phase main bus 6 is arranged in the busbar room, a first circuit breaker 7 is arranged in the first circuit breaker room, a trolley type second circuit breaker 8 is arranged in the trolley room, and a bus A closing resistor 9 connected in parallel with the first circuit breaker is provided in the line room, a mutual inductor 10 and a grounding switch 11 are provided in the cable room, an upper contact box 12 and a lower contact box 13 are provided in the busbar room and the cable room respectively, and openings corresponding to the upper contact box 12 and the lower contact box 13 are provided on the side wall of the trolley room. The two contact arms of the second circuit breaker correspond to the upper contact box 12 and the lower contact box 13 respectively. The upper contact box is connected to the three-phase main bus through the first circuit breaker, the lower contact box is connected to the mutual inductor, and the mutual inductor is connected to the grounding switch.

[0027] A locking device is provided between the door 14 of the trolley room and the second circuit breaker. When the two contact arms of the second circuit breaker are plugged into and matched with the upper contact box 12 and the lower contact box 13, the door is locked and cannot be opened. When the two contact arms of the second circuit breaker are completely separated from the upper contact box 12 and the lower contact box 13, the door can be opened.

[0028] The interlocking device includes a locking rod 15 arranged along the moving direction of the second circuit breaker. The locking rod is arranged at the bottom of the trolley chamber through the shaft seat. A slide groove 16 is arranged on the upper part of the locking rod along the length direction. A slider 17 that cooperates with the slide groove is fixedly arranged at the bottom of the second circuit breaker. A blind hole 18 is provided at the outer end of the door corresponding to the locking rod. An annular groove 19 is provided on the inner wall of the blind hole 18. A notch 20 communicating with the annular groove 19 is provided at the outer end of the blind hole. A locking block 21 is fixedly provided on one side of the outer end of the locking rod. When the locking block is aligned with the notch, the outer end of the locking rod can extend into the blind hole to lock The fixed rod rotates a certain angle so that the locking block is not aligned with the notch. At this time, the locking block is stuck in the annular groove, and the outer end of the locking rod cannot be separated from the chamber door. Since the locking rod can only rotate and cannot extend, the chamber door is locked and cannot be opened. The slide groove is divided into a straight groove part 161 and an oblique groove part 162. When the two contact arms of the second circuit breaker are completely separated from the upper contact box 12 and the lower contact box 13 and move close to the chamber door to the extreme position, the slider moves to the oblique groove position to drive the locking rod to rotate a certain angle. At this time, the locking block is aligned with the notch, the lock on the chamber door is released, and the chamber door can be opened.

[0029] A driving device is provided between the door 14 of the trolley chamber and the second circuit breaker. When the door is closed, the driving device can drive the second circuit breaker to move in the trolley chamber, controlling the connection and separation of the two contact arms of the second circuit breaker with the upper contact box 12 and the lower contact box 13.

[0030] The drive device includes a handwheel 22 mounted on the door. The inner end of the handwheel's shaft extends into the interior of the trolley chamber. A screw 23 parallel to the locking rod 15 is installed in the trolley chamber through an axle seat. A drive block 24 that cooperates with the thread is set at the bottom of the second circuit breaker. A locking structure is set between the outer end of the screw and the inner end of the handwheel's shaft. When the door is closed, the outer end of the screw and the inner end of the handwheel's shaft are connected by the locking structure. At this time, shaking the handwheel outside the door can drive the screw to rotate, thereby driving the second circuit breaker to move through the drive block. This design ensures that the screw can only be rotated to adjust the movement of the second circuit breaker when the door is closed, avoiding the second circuit breaker from being driven to close when the door is open.

[0031] A safety device is provided between the door 14 of the trolley room and the second circuit breaker, the safety device includes a strip plate 25 provided at both sides of the bottom of the trolley room corresponding to the second circuit breaker, the roller of the second circuit breaker is located on the upper side of the strip plate, a bracket 26 is fixedly provided on one side of the upper part of the strip plate 25, a vertical rod 27 is provided on the inner side of the bracket, a sliding sleeve 28 is provided on the outside of the vertical rod 27, the sliding sleeve is fixedly connected to the bracket, the upper end of the vertical rod 27 is hingedly connected to the bottom of the cross rod 31, the outer end of the cross rod 31 is hingedly connected to the upper end of the bracket, a long strip plate 29 parallel to the screw rod is fixedly installed on the lower side of the inner end of the cross rod, a plurality of evenly distributed card grooves 30 are provided at the bottom of the long strip plate 29 along the length direction, the axis of the roller of the second circuit breaker can be engaged with one of the card grooves, a through hole 32 parallel to the screw rod is provided at the lower end position of the strip plate corresponding to the vertical rod, a push rod 33 is provided in the through hole 32, and a second push rod 33 is provided at the inner end of the push rod A slope 34, the lower end of the vertical rod extends into the through hole and is provided with a second slope 35 that cooperates with the first slope. The vertical rod and the sliding sleeve are connected by a first spring 36, and the push rod 33 is connected to the outer end of the through hole by a second spring 37. A push rod 38 is provided between the inner side of the chamber door and the outer end of the push rod. When the chamber door is closed, the push rod pushes the push rod inward. Through the cooperation of the first slope and the second slope, the vertical rod moves up, and the inner end of the cross rod moves up under the drive of the vertical rod, driving the long plate to rise. At this time, the shaft of the roller of the second circuit breaker is separated from the slot. At this time, the lock of the second circuit breaker is released, and the second circuit breaker can be driven to move by the driving device. When the chamber door is opened, the long plate falls, and the shaft of the roller of the second circuit breaker is engaged with one of the slots. At this time, the second circuit breaker is locked, and even if the screw rod is turned, the second circuit breaker cannot be driven to move, thereby further improving safety.

[0032] The card-matching structure includes several holes 39 of different sizes at the outer end of the screw rod, and the inner end of the handwheel shaft is provided with a protrusion 40 of corresponding size corresponding to the hole slot. Only after the protrusions of different sizes are aligned with the hole slot, the outer end of the screw rod and the inner end of the handwheel shaft are connected through the card-matching structure. Through this design, when the room door is opened, the screw rod cannot be driven by conventional tools, and the second circuit breaker cannot be driven, which further improves safety and avoids misoperation.

[0033] Working principle: when the door of the trolley room is closed, the safety device releases the lock on the second circuit breaker, and the second circuit breaker can be driven to move inward by the driving device. As the second circuit breaker moves inward, the door is locked by the interlocking device, and finally the two contact arms of the second circuit breaker are plugged into the upper contact box 12 and the lower contact box 13 to complete the closing. In this state, the door cannot be opened to ensure safety. The second circuit breaker is driven to move outward to the extreme position by the driving device, and the two contact arms of the second circuit breaker are separated from the upper contact box 12 and the lower contact box 13. The interlocking device releases the lock on the door, and the door can be opened at this time. When the door is opened, the driving device cannot work, and the safety device locks the second circuit breaker. The safety of the switch cabinet is achieved through the cooperation of multiple devices. It has a simple structure, high stability, and multiple collaborative protection functions.

Claims

1. An AC double circuit breaker switchgear for a power transmission system, characterized by: The utility model comprises a cabinet body, a trolley room is arranged in the cabinet body, a trolley-type second circuit breaker is arranged in the trolley room, a locking device is arranged between the door of the trolley room and the second circuit breaker, the locking device comprises a locking rod arranged along the moving direction of the second circuit breaker, the locking rod is arranged at the bottom of the trolley room through the shaft seat, a slide groove is arranged on the upper part of the locking rod along the length direction, a slider matched with the slide groove is fixedly arranged at the bottom of the second circuit breaker, a blind hole is arranged at the outer end of the door corresponding to the locking rod, an annular groove is arranged on the inner wall of the blind hole, and a gap is arranged at the outer end of the blind hole to communicate with the annular groove. A locking block is fixedly provided on one side of the outer end of the locking rod. When the locking block is aligned with the notch, the outer end of the locking rod can extend into the blind hole. The slide groove is divided into a straight groove part and an oblique groove part. When the second circuit breaker moves close to the chamber door, the slider moves to the oblique groove part position to drive the locking rod to rotate a certain angle. At this time, the locking block is aligned with the notch, the lock of the chamber door is released, and the chamber door can be opened. A driving device is provided between the chamber door of the trolley chamber and the second circuit breaker. When the chamber door is in a closed state, the driving device can drive the second circuit breaker to move in the trolley chamber. The driving device includes a handwheel installed on the chamber door, the inner end of the handwheel shaft extends into the interior of the trolley chamber, a screw rod parallel to the locking rod is installed in the trolley chamber through the shaft seat, a driving block matched with the thread is provided at the bottom of the second circuit breaker, and a card matching structure is provided between the outer end of the screw rod and the inner end of the handwheel shaft. When the chamber door is closed, the outer end of the screw rod is connected to the inner end of the handwheel shaft through the card matching structure; a safety device is provided between the chamber door of the trolley chamber and the second circuit breaker, the safety device includes a strip plate provided at both sides of the bottom of the trolley chamber corresponding to the second circuit breaker, the roller of the second circuit breaker is located on the upper side of the strip plate, a bracket is fixedly provided on one side of the upper side of the strip plate, a vertical rod is provided on the inside of the bracket, a sliding sleeve is set on the outside of the vertical rod, the sliding sleeve is fixedly connected to the bracket, the upper end of the vertical rod is hingedly connected to the bottom of the cross rod, the outer end of the cross rod is hingedly connected to the upper end of the bracket, and the cross rod The lower end of the vertical rod is provided with a through hole parallel to the screw rod, and a push rod is provided in the through hole, and the inner end of the push rod is provided with a first inclined surface, and the lower end of the vertical rod extends into the through hole and is provided with a second inclined surface cooperating with the first inclined surface. The vertical rod and the sliding sleeve are connected by a first spring, and the push rod and the outer end of the through hole are connected by a second spring. A push rod is provided between the inner side of the chamber door and the outer end of the push rod corresponding to the push rod. When the chamber door is closed, the push rod pushes the push rod inward. Through the cooperation of the first inclined surface and the second inclined surface, the vertical rod moves up, and the cross bar moves up under the drive of the vertical rod to drive the long strip plate to rise. At this time, the shaft of the roller of the second circuit breaker is separated from the slot.

2. An AC double circuit breaker switchgear for a power transmission system according to claim 1, characterized in that : The card-matching structure includes several holes of different sizes at the outer end of the screw rod, and the inner end of the handwheel shaft is provided with a protrusion of corresponding size corresponding to the hole groove.

3. The AC double circuit breaker switchgear for a power transmission system according to claim 1, characterized in that : The cabinet is also equipped with busbar room, cable room, instrument room and first circuit breaker room.

4. The AC double circuit breaker switchgear for a power transmission system according to claim 3, characterized in that : The instrument room is located on the upper side of the first circuit breaker room, the trolley room is located on the lower side of the first circuit breaker room, the busbar room and cable room are located on the rear side of the trolley room, and the cable room is located on the lower side of the busbar room.

5. The AC double circuit breaker switchgear for a power transmission system according to claim 4, characterized in that : A three-phase main bus is arranged in the busbar room, a first circuit breaker is arranged in the first circuit breaker room, and a closing resistor is arranged in parallel with the first circuit breaker in the busbar room.

6. The AC double circuit breaker switchgear for a power transmission system according to claim 5, characterized in that : A transformer and a grounding switch are installed in the cable room, an upper contact box and a lower contact box are respectively provided in the busbar room and the cable room, and openings corresponding to the upper contact box and the lower contact box are opened on the side wall of the trolley room. The two contact arms of the second circuit breaker correspond to the upper contact box and the lower contact box respectively. The upper contact box is connected to the three-phase main bus through the first circuit breaker, the lower contact box is connected to the transformer, and the transformer is connected to the grounding switch.

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