Alternating-current double-circuit-breaker switch cabinet for power transmission system

Abstract

The invention discloses an alternating-current double-circuit breaker switch cabinet for a power transmission system, which relates to the field of switch cabinet interlocking structures and comprises a cabinet body, a handcart chamber arranged in the cabinet body, a handcart type second circuit breaker arranged in the handcart chamber, and an interlocking device arranged between a chamber door of the handcart chamber and the second circuit breaker. The safety device releases locking of the second circuit breaker, the driving device can drive the second circuit breaker to move towards the inner side, in the process that the second circuit breaker moves towards the inner side, the chamber door is locked by the interlocking device, the chamber door cannot be opened, after the chamber door is unlocked, the driving device cannot work, and the safety device locks the second circuit breaker. The safety of the switch cabinet is realized through the cooperation of multiple devices, the structure is simple, the stability is high, and the switch cabinet has multiple cooperative protection functions.

Description

Technical Field

[0001] The 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, in order to ensure the personal safety of workers during maintenance and inspection, interlocking is required between different components of 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 to ensure safety. The cabinet door can only be opened when the circuit breaker returns to the test position. Therefore, how to achieve reliable interlocking between the cabinet door and the circuit breaker trolley has always been a hot topic of research.

[0003] Low-frequency transmission system switchgear is also used in marine power generation lines. According to national standards, a safety interlocking mechanism needs to be set up in the switchgear. As a special component of the switchgear, the interlocking structure mainly prevents operators from causing damage to the switchgear equipment or 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 comprises a cabinet, a trolley room is arranged in the cabinet, 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 an axle 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 groove is arranged at the outer end of the blind hole corresponding to the locking rod. The notch is connected to the annular groove, and a locking block is fixedly arranged 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 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 arranged between the chamber door of the trolley chamber and the second circuit breaker. When the chamber door is in a closed state, the second circuit breaker can be driven to move in the trolley chamber through the driving device.

[0007] Preferably, 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 an axle seat, a driving block matching 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.

[0008] A preferred design is that a safety device is arranged between the door of the vehicle compartment and the second circuit breaker, the safety device comprises a strip plate arranged at both sides of the bottom of the vehicle 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 arranged on one side of the upper side of the strip plate, a vertical rod is arranged on the inner side of the bracket, a sliding sleeve is arranged 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 arranged 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 connected 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 arranged in the through hole, and a first inclined surface is arranged 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 arranged 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 to drive 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 card-matching structure includes several hole grooves of different sizes at the outer end of the screw rod, and the inner end of the handwheel shaft is provided with a convex block of corresponding size corresponding to the hole groove.

[0010] Furthermore, a busbar room, a cable room, an instrument room, and a first circuit breaker room are also arranged 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 arranged in the busbar room, a first circuit breaker is arranged in the first circuit breaker room, and a closing resistor connected in parallel with the first circuit breaker is arranged in the busbar room.

[0013] Furthermore, a transformer and an earthing switch are arranged in the cable room, an upper contact box and a lower contact box are arranged in the busbar room and the cable room respectively, an opening corresponding to the upper contact box and the lower contact box is opened on the side wall of the trolley room, 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 earthing switch.

[0014] To sum up, according to the working principle of the present invention, 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 is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figure 1 It is a schematic diagram of the overall internal structure of the present invention; Figure 2 for Figure 1 A schematic diagram of the partial enlarged structure of part Ⅰ; Figure 3 It is a partial structural schematic diagram of the safety device of the present invention; Figure 4 It is a schematic diagram of the top view of the structure of the door and the interlocking device of the present invention; Figure 5 It is a schematic diagram of the shaft matching between the long strip plate of the present invention and the roller of the second circuit breaker; Figure 6 It is a schematic diagram of the matching structure of the first inclined surface and the second inclined surface; Figure 7 It is a schematic diagram of the door cross-section direction and the matching structure of the locking rod; Figure 8 It is a schematic diagram of the structure of the inner side of the door and the locking rod; Fig. 9 for Figure 4 A schematic diagram of the partial enlarged structure of part II; Fig.10 for Figure 4 Schematic diagram of the local enlarged structure of Part III. DETAILED DESCRIPTION

[0016] 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 arranged in the line room, a mutual inductor 10 and a grounding switch 11 are arranged in the cable room, an upper contact box 12 and a lower contact box 13 are respectively arranged in the busbar room and the cable room, openings corresponding to the upper contact box 12 and the lower contact box 13 are opened on the side wall of the trolley room, 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.

[0017] An interlocking 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.

[0018] 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 an axle seat, a slide groove 16 is arranged on the upper part of the locking rod along the length direction, a slider 17 matched with the slide groove is fixedly arranged at the bottom of the second circuit breaker, a blind hole 18 is arranged at the outer end of the chamber door corresponding to the locking rod, an annular groove 19 is arranged on the inner wall of the blind hole 18, a notch 20 connected with the annular groove 19 is arranged at the outer end of the blind hole, a locking block 21 is fixedly arranged on one side of the outer end of the locking rod, and 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 door. Since the locking rod can only rotate but not extend, the door is locked and cannot be opened. The slide groove is divided into a straight groove portion 161 and an oblique groove portion 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 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 door is unlocked, and the door can be opened.

[0019] A driving device is arranged between the door 14 of the trolley room and the second circuit breaker. When the door is in a closed state, the driving device can drive the second circuit breaker to move in the trolley room, and control the two contact arms of the second circuit breaker to be connected and separated with the upper contact box 12 and the lower contact box 13.

[0020] The driving device includes a hand wheel 22 installed on the door, the inner end of the hand wheel shaft extends into the inside of the trolley room, a screw rod 23 parallel to the locking rod 15 is installed in the trolley room through the shaft seat, a driving block 24 matched with the thread is set at the bottom of the second circuit breaker, and a card-matching structure is set between the outer end of the screw rod and the inner end of the hand wheel shaft. When the door is closed, the outer end of the screw rod is connected to the inner end of the hand wheel shaft through the card-matching structure. At this time, shaking the hand wheel outside the door can drive the screw rod to rotate, thereby driving the second circuit breaker to move through the driving block. Through this design, it is achieved that the screw can be rotated to adjust the movement of the second circuit breaker only when the door is closed, avoiding the second circuit breaker from being driven to close when the door is in the open state.

[0021] A safety device is arranged between the door 14 of the trolley room and the second circuit breaker, and the safety device comprises a strip plate 25 arranged 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 arranged on one side of the upper part of the strip plate 25, a vertical rod 27 is arranged on the inner side of the bracket, a sliding sleeve 28 is mounted on the outer side of the vertical rod 27, and 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 arranged at the bottom of the long strip plate 29 along the length direction, and 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 arranged at the lower end position of the strip plate corresponding to the vertical rod, a push rod 33 is arranged in the through hole 32, and a first push rod 33 is arranged at the inner end of the push rod 33 A slope 34 is provided, and the lower end of the vertical rod extends into the through hole and is provided with a second slope 35 which cooperates with the first slope. The vertical rod is connected to the sliding sleeve 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 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. 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 strip 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 rotated, the second circuit breaker cannot be driven to move, thereby further improving safety.

[0022] The card-matching structure includes several hole grooves 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 groove. Only after the protrusions of different sizes are aligned with the hole groove, 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.

[0023] 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 coordinated protection functions.

Claims

1. An AC double circuit breaker switch cabinet for a power transmission system, characterized in that: The invention 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 an axle 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 connected with the annular groove is arranged at the outer end of the blind hole A locking block is fixedly arranged 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 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 arranged 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.

2. An AC double circuit breaker switch cabinet for a power transmission system as claimed in claim 1, characterized in that : The driving device includes a handwheel installed on the room door, the inner end of the handwheel shaft extends into the interior of the trolley room, a screw rod parallel to the locking rod is installed in the trolley room through an axle seat, a driving block matching with the thread is arranged at the bottom of the second circuit breaker, and a card-matching structure is arranged between the outer end of the screw rod and the inner end of the handwheel shaft. When the room 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.

3. An AC double circuit breaker switch cabinet for a power transmission system as claimed in claim 1, characterized in that : A safety device is arranged between the door of the trolley room and the second circuit breaker, and the safety device includes a strip plate arranged 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 is fixedly arranged on one side of the upper side of the strip plate, a vertical rod is arranged on the inner side of the bracket, a sliding sleeve is arranged 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, a long strip plate parallel to the screw rod is fixedly installed on the lower side of the inner end of the cross rod, and a plurality of evenly distributed slots are arranged 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 locked with one of the slots The strip plate is provided with a through hole parallel to the screw rod at the lower end position of the vertical rod, a push rod is arranged in the through hole, a first inclined surface is arranged 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 with the first inclined surface, the vertical rod and the sliding sleeve are connected by a first spring, the push rod and the outer end of the through hole are connected by a second spring, a push rod is arranged 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 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.

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

5. The AC double circuit breaker switch cabinet 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 the first circuit breaker room.

6. An AC double circuit breaker switch cabinet for a power transmission system as claimed in claim 5, 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.

7. An AC double circuit breaker switch cabinet for a power transmission system as claimed in claim 6, 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 which is arranged in parallel with the first circuit breaker is arranged in the busbar room.

8. An AC double circuit breaker switch cabinet for a power transmission system as claimed in claim 7, characterized in that : A transformer and a grounding switch are arranged in the cable room, an upper contact box and a lower contact box are arranged 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.

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