A current monitoring instrument for power grid stability closing operation equipment

Abstract

This utility model discloses a current monitoring instrument for a power grid stabilization loop-closing operation device, belonging to the field of loop-closing current monitoring technology. It includes a base shell, with a current transformer for monitoring the loop-closing current fixedly installed inside the shell. A cable for connecting the main circuit of the loop-closing circuit to the signal input terminal of the current transformer is fixedly connected inside the shell. A secondary contact block is fixedly connected to the end of the cable closest to the current transformer. In use, when a loop-closing fault occurs, a diagonal rod can push the secondary contact block to separate from the main contact block, cutting off the signal path between the current transformer and the cable, preventing the spread of loop-closing short-circuit current and impact current. Simultaneously, the secondary contact block rotates 90° during movement, so that its conductive end faces the grounding discharge block. Through close contact with the secondary contact block, residual charge or fault current can be smoothly diverted through the grounding discharge block to the adjacent ring network backup circuit, transferring the current.

Description

Technical Field

[0001] This utility model relates to the field of loop current monitoring technology, specifically a current monitoring instrument for power grid stability loop operation equipment. Background Technology

[0002] Grid looping refers to the process in which two or more originally independent distribution networks, usually radial networks connected by substation busbars and ring network lines, are combined into a closed-loop power supply network by operating equipment such as circuit breakers and disconnect switches during the operation of a power system. As society becomes increasingly reliant on electricity, in order to cope with the expansion of the power system and the increasing demands of users for power supply reliability, the power grid loop is used to supply power through multiple paths to cope with the expansion of the power system. With the advancement of urbanization and industrialization, the power system has gradually developed from the early regional small power grids to large-scale interconnected power grids that span cities and provinces. The limitations of single radial networks in terms of coverage and load-bearing capacity are becoming increasingly apparent. By constructing a ring structure, the power grid connects substations and distribution lines in different regions into an organic whole, enabling power resources to be allocated beyond regional limitations. When a region experiences a surge in load due to industrial agglomeration or a significant increase in electricity demand due to seasonal factors, power can be obtained from the power grid in neighboring regions through the ring network, without relying on the expansion of a single power source. This enhances the overall carrying capacity of the existing power grid and adapts to changes in load distribution caused by the expansion of the system.

[0003] In existing technologies, when using equipment for monitoring loop closure faults, the only way to notify staff is by emitting sound or light, and then waiting for staff to manually disconnect the line connection. Since it takes time for staff to shut down the connection, it is difficult to meet the timeliness requirements for emergency fault handling. As a result, the fault current that is not disconnected in time spreads to the main loop of the power grid, causing a sudden drop in voltage on the distribution network lines around the loop closure point, malfunction of relay protection devices, and cascading tripping of multiple line switches. This expands the power outage area from the fault point to the entire residential area or industrial park, affecting the normal power supply of users. Therefore, this utility model provides a current monitoring instrument for power grid stabilization loop closure operation equipment to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of this invention is to provide a current monitoring instrument for power grid stability loop-closing operation equipment, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A current monitoring instrument for a power grid stabilization loop-closing operation device includes a base housing. A current transformer for monitoring the loop-closing current is fixedly installed inside the base housing. A cable for connecting the main circuit of the loop-closing circuit to the signal input terminal of the current transformer is fixedly connected to the inner cavity of the base housing. A secondary contact block is fixedly connected to the end of the cable near the current transformer, and a main contact block is fixedly connected to the side of the secondary contact block away from the cable. The end of the main contact block near the current transformer is fixedly connected to the outer wall of the current transformer. A device for draining... The grounding discharge block removes residual charge and short-circuit current, and transfers residual charge and short-circuit current generated when the current transformer or closed loop fails. Both ends of the current transformer are equipped with a splitting structure for disconnecting the secondary contact block from the main contact block. The splitting structure quickly cuts off the signal transmission path when the current transformer fails. The top and bottom of the current transformer are equipped with a rotating structure for flipping the secondary contact block. The rotating structure flips the secondary contact block so that its conductive end connects with the grounding discharge block.

[0006] As a further embodiment of this utility model, the splitting structure includes a sliding plate, which is slidably connected to the inner cavity of the base shell. The end of the sliding plate near the secondary contact block is rotatably connected by a pin to an inclined rod for pushing the secondary contact block to separate from the main contact block. The end of the inclined rod away from the sliding plate is fixedly rotatably connected to a clamping block.

[0007] As a further embodiment of this utility model, the rotating structure includes a fixed rack, which is fixedly connected to the inner cavity of the base shell. A connecting rod is fixedly connected to one side of the secondary contact block. There are two connecting rods in total, and the two connecting rods are respectively fixedly connected between the four secondary contact blocks. A rotating gear for driving the secondary contact blocks to rotate is fixedly connected to the inner cavity of the connecting rod.

[0008] As a further embodiment of this utility model, both ends of the grounding discharge block are fixedly connected to a connecting shell, and the inner cavity of the connecting shell is fixedly connected to a spring for pushing the grounding discharge block and the secondary contact block to fit tightly together.

[0009] As a further embodiment of this utility model, the outer wall of the secondary contact block is fixedly connected to an arc-shaped flexible plate for squeezing the grounding discharge block, and the arc-shaped flexible plate retracts when the secondary contact block is flipped.

[0010] As a further embodiment of this utility model, a display screen for real-time display of closed-loop current monitoring data is fixedly connected to the outer wall of the base shell. A button for adjusting parameters is provided below the display screen. A status indicator light for intuitively indicating faults is provided on one side of the button. A loudspeaker for emitting alarm sounds is provided between the button and the status indicator light.

[0011] Compared with the prior art, the beneficial effects of this utility model are: When this utility model is in use, when a loop failure occurs, the inclined rod can push the secondary contact block to separate from the main contact block, cutting off the signal path between the current transformer and the cable, preventing the spread of the loop short-circuit current and impact current, effectively isolating the risk source, and preventing the internal components of the instrument from burning out or the range of the power grid fault from expanding. At the same time, the secondary contact block rotates 90° during the movement, so that the conductive end of the secondary contact block faces the grounding discharge block. Through close contact with the secondary contact block, the residual charge or fault current can be smoothly guided through the grounding discharge block to the adjacent ring network backup circuit, transferring the current, preventing current diffusion, and avoiding the risk of component breakdown or arcing caused by charge retention due to poor power discharge. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a current monitoring instrument for a power grid stability loop-closing operation device.

[0013] Figure 2 This is a schematic diagram of the current transformer in a current monitoring instrument for a power grid stability loop-closing operation device.

[0014] Figure 3 This is a schematic diagram of the grounding discharge block in a current monitoring instrument for a power grid stability loop operation device.

[0015] Figure 4 This is a schematic diagram of the rotating structure in a current monitoring instrument for a power grid stability loop-closing operation device.

[0016] In the diagram: 1. Base shell; 2. Current transformer; 3. Cable; 4. Secondary contact block; 5. Main contact block; 6. Grounding discharge block; 7. Split structure; 8. Rotating structure; 101. Display screen; 102. Button; 103. Status indicator light; 104. Announcer; 105. Extension block; 106. Threaded pin; 601. Connecting shell; 602. Spring; 701. Sliding plate; 702. Diagonal rod; 703. Clamping block; 704. Large gear; 705. Sliding rack; 706. Motor; 801. Fixed rack; 802. Connecting rod; 803. Rotating gear; 804. Limiting strip; 805. Sliding block; 806. Arc-shaped flexible plate. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-4 In this embodiment of the present invention, a current monitoring instrument for a power grid stabilization loop-closing operation device includes a base shell 1. A current transformer 2 for monitoring the loop-closing current is fixedly installed inside the cavity of the base shell 1. A cable 3 for connecting the main line of the loop-closing circuit to the signal input terminal of the current transformer 2 is fixedly connected inside the cavity of the base shell 1. The monitoring current signal during the power grid loop-closing operation can be transmitted to the current transformer 2 through the cable 3, enabling the current transformer 2 to monitor the loop-closing inrush current. A secondary contact block 4 is fixedly connected to one end of the cable 3 near the current transformer 2, and a main contact block 5 is fixedly connected to the side of the secondary contact block 4 away from the cable 3. One end of the current transformer 2 is fixedly connected to the outer wall of the current transformer 2. Specifically, multiple cables 3 are provided, and these cables 3 are divided into two groups. Each group of cables 3 has two secondary contact blocks 4 fixedly connected to the end near the current transformer 2. The number of main contact blocks 5 and secondary contact blocks 4 is the same. The inner wall of the base shell 1 is fixedly connected to a grounding discharge block 6 for discharging residual charge and short-circuit current. The grounding discharge block 6 transfers the residual charge and short-circuit current generated when the current transformer 2 or the closed loop fails. There are two groups of grounding discharge blocks 6, and the two groups of grounding discharge blocks 6 are located in the upper half and lower half of the inner wall of the base shell 1, respectively, so that the current... During the monitoring process of the closed-loop circuit, if an abnormal closed-loop parameter fault or a short-circuit fault occurs, the secondary contact block 4 contacts the grounding discharge block 6. This allows the closed-loop current to be transferred to the adjacent ring network's backup circuit via the grounding discharge block 6. This also allows the inrush circulating current, short-circuit fault current, and normal operating current of the closed-loop load caused by abnormal parameters in the closed-loop circuit to be transferred to the adjacent ring network's backup circuit via the pre-set current-conducting interface of the grounding discharge block 6. This prevents the fault current from damaging the current transformer 2 and also prevents the fault's impact from expanding from the closed-loop operation point to surrounding distribution network lines. Both ends of the current transformer 2 are equipped with devices for actuating the secondary contact block. The split structure 7 disconnects from the main contact block 5 and quickly cuts off the signal transmission path when the current transformer 2 fails, preventing the fault current from spreading to the main loop of the power grid through the cable 3. The top and bottom of the current transformer 2 are equipped with a rotating structure 8 for pushing the secondary contact block 4 to flip. The rotating structure 8 pushes the secondary contact block 4 to flip so that the conductive end of the secondary contact block 4 is connected to the grounding discharge block 6, so that the abnormal current generated by the residual charge of the secondary contact block 4 can be safely discharged through the grounding discharge block 6 in the event of a fault, preventing the fault current, residual charge or abnormal signal from spreading to the critical loop of the power grid loop operation.

[0019] Please see Figures 2-4The split structure 7 includes a sliding plate 701, which is slidably connected to the inner cavity of the base shell 1. Two sliding plates 701 are provided, and each sliding plate 701 is slidably connected to one side of the inner cavity of the base shell 1. One end of the sliding plate 701 near the secondary contact block 4 is rotatably connected via a pin to an inclined rod 702 for pushing the secondary contact block 4 to separate from the main contact block 5. Four inclined rods 702 are provided, and each of the four is rotatably connected to the outer wall of one of the two sliding plates 701. One end of the inclined rod 702 away from the sliding plate 701 is fixedly rotatably connected to a clamping block 703. The end of the clamping block 703 near the secondary contact block 4 is rotatably connected to the outer wall of the secondary contact block 4 via a bearing. Specifically, a large gear 704 is rotatably connected to the inner cavity of the base shell 1. A sliding rack 705 for driving the sliding plates 701 to slide is also slidably connected to the inner cavity of the base shell 1. Two sliding racks 705 are provided. Two sliding racks 705 are located at the top and bottom of the large gear 704 respectively and mesh with the large gear 704. A motor 706 for driving the large gear 704 to rotate is fixedly installed in the inner cavity of the base shell 1. The output shaft of the motor 706 is fixedly connected to the large gear 704. When in use, the output shaft of the motor 706 can drive the large gear 704 to rotate. The large gear 704 drives the two sliding plates 701 to slide simultaneously through the two sliding racks 705. When the two sliding plates 701 are retracted at the same time, the inclined rod 702 pushes the secondary contact block 4 to separate from the main contact block 5, so that the secondary contact block 4 and the main contact block 5 are disconnected, cutting off the signal transmission path between the current transformer 2 and the cable 3. When an abnormal current occurs in the closed loop, the fault current is prevented from spreading to the core control unit through the cable 3, and the internal components of the current transformer 2 are prevented from burning out. When the two sliding plates 701 are simultaneously extended to both sides, the secondary contact block 4 can be pulled towards the main contact block 5 by the inclined rod 702 until the secondary contact block 4 and the main contact block 5 reconnect and reconnect, so that the device can restore the loop current monitoring capability and meet the continuous monitoring requirements of the power grid loop operation.

[0020] Please see Figures 2-4The rotating structure 8 includes a fixed rack 801, which is fixedly connected to the inner cavity of the base shell 1. A connecting rod 802 is fixedly connected to one side of each secondary contact block 4. Two connecting rods 802 are provided, and each connecting rod 802 is fixedly connected between the four secondary contact blocks 4. A rotating gear 803 for driving the secondary contact blocks 4 to rotate is fixedly connected to the inner cavity of the connecting rod 802. Specifically, a limiting strip 804 for limiting the movement of the secondary contact blocks 4 is fixedly connected to the inner wall of the base shell 1. A sliding block 805 is slidably connected to the inner cavity of the limiting strip 804. Eight limiting strips 804 and eight sliding blocks 805 are provided, and the eight sliding blocks 805 are fixedly connected to the outer walls of the four secondary contact blocks 4, causing the secondary contact blocks 4 to move away from the electrical source. When the current transformer 2 slides, it drives the sliding block 805 to slide inside the limiting strip 804. The limiting strip 804 limits the secondary contact block 4, keeping the secondary contact block 4 sliding smoothly along the preset path and preventing it from deviating due to sliding. When it continues to slide until the rotating gear 803 meshes with the fixed rack 801, the meshing of the teeth of the fixed rack 801 and the teeth of the rotating gear 803 drives the rotating gear 803 and the secondary contact block 4 to flip. When the secondary contact block 4 and the rotating gear 803 flip and slide to the end of the fixed rack 801, the rotating gear 803 and the secondary contact block 4 precisely flip 90°, so that the conductive end of the secondary contact block 4 faces the grounding discharge block 6, preparing for subsequent contact with the grounding discharge block 6 and realizing current discharge.

[0021] Please see Figures 2-3 Both ends of the grounding discharge block 6 are fixedly connected to a connecting shell 601. The inner cavity of the connecting shell 601 is fixedly connected to a spring 602 for pushing the grounding discharge block 6 and the secondary contact block 4 to fit tightly together. The spring 602 unfolds and the connecting shell 601 pushes the grounding discharge block 6 and the secondary contact block 4 to make tight contact. This ensures that residual charge or fault current can be smoothly introduced through the grounding discharge block 6 into the adjacent ring network backup circuit, transferring the current and preventing the continuous flow of fault current in the closed loop circuit, which would cause a sudden drop in the voltage at the closed loop point, triggering the circuit breaker of the surrounding distribution network line to trip in an interlocking manner and expand the fault range.

[0022] Please see Figures 3-4 The outer wall of the secondary contact block 4 is fixedly connected to an arc-shaped flexible plate 806 for pressing the grounding discharge block 6. The arc-shaped flexible plate 806 retracts when the secondary contact block 4 is flipped to prevent the secondary contact block 4 from scraping the conductive end of the grounding discharge block 6 due to positional deviation during the flipping process. This avoids damage such as scratches and oxide layer peeling from the conductive end of the grounding discharge block 6, ensuring its long-term stable conductivity and preventing a decrease in current transmission efficiency due to damage to the conductive end.

[0023] Please see Figure 1A display screen 101 for real-time display of loop current monitoring data is fixedly connected to the outer wall of the base shell 1. A button 102 for adjusting parameters is provided below the display screen 101. A status indicator light 103 for visually indicating faults is provided on one side of the button 102. A loudspeaker 104 for emitting alarm sounds is provided between the button 102 and the status indicator light 103. Specifically, the button 102, status indicator light 103 and loudspeaker 104 are all fixedly connected to the outer wall of the base shell 1. When a fault occurs in the loop of the power grid, the status indicator light 103 flashes and the loudspeaker 104 emits an alarm sound to prompt the staff to intervene in time and prevent the abnormality from continuing to expand, causing the loop circuit breaker to trip and the current transformer 2 to be damaged. Extension blocks 105 are fixedly connected to both sides of the outer wall of the base shell 1. The inner cavity of the extension block 105 is provided with a threaded nail 106 for fixing the base shell 1 to the mounting carrier. The threaded nail 106 can be rotated and screwed into the mounting carrier to make the extension block 105 fit tightly with the mounting carrier and fix the position of the base shell 1.

[0024] The working principle of this utility model is as follows: In use, this utility model connects the closed-loop circuit and the current transformer 2 via cable 3, enabling the current transformer 2 to monitor the closed-loop inrush current. When abnormal parameters or short-circuit faults occur in the closed-loop circuit, the status indicator light 103 will flash and the loudspeaker 104 will emit an alarm sound, prompting staff to intervene promptly. Simultaneously, the drive motor 706 drives the output shaft to rotate the large gear 704. The large gear 704, through two sliding racks 705, simultaneously drives two sliding plates 701 to slide. When the two sliding plates 701 retract simultaneously, the inclined rod 702 pushes the secondary contact block 4 to slide away from the main contact block 5, separating it from the main contact block 5. This disconnects the secondary contact block 4 from the main contact block 5. The secondary contact block 4 then slides until it reaches the point where the rotating gear 803 and the fixed rack 805 meet. During engagement, the teeth of the fixed rack 801 mesh with the teeth of the rotating gear 803, driving the rotating gear 803 and the secondary contact block 4 to rotate. When the secondary contact block 4 and the rotating gear 803 rotate and slide to the end of the fixed rack 801, the rotating gear 803 and the secondary contact block 4 precisely rotate 90°, so that the arc-shaped flexible plate 806 can no longer restrict the grounding discharge block 6. The grounding discharge block 6 is then unfolded by the spring 602 and moves upward to make close contact with the secondary contact block 4. The residual charge or fault current can be smoothly guided through the grounding discharge block 6 to the adjacent ring network backup circuit, transferring the current and providing a safe power-off environment for the staff to repair the current transformer 2 or the faulty components of the closed loop circuit, avoiding the risk of electric shock caused by the components being energized during repair. After troubleshooting, the output shaft of the drive motor 706 can be used to rotate the large gear 704. The large gear 704, through two sliding racks 705, simultaneously drives the two sliding plates 701 to slide. When the two sliding plates 701 are simultaneously unfolded to both sides, the inclined rod 702 can pull the secondary contact block 4 towards the main contact block 5. During the sliding process, the teeth of the fixed rack 801 mesh with the teeth of the rotating gear 803, driving the rotating gear 803 and the secondary contact block 4 to rotate in the opposite direction until the secondary contact block 4 and the main contact block 5 reconnect and reconnect. This restores the device's ability to monitor the closed-loop current, continuously monitors the closed-loop of the power grid, and ensures the safe and stable operation of the closed-loop operation.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A current monitoring instrument for a power grid stability loop-closing operation device, comprising a base shell (1), characterized in that, A current transformer (2) for monitoring the closed-loop current is fixedly installed in the inner cavity of the base shell (1). A cable (3) for connecting the main circuit of the closed-loop circuit to the signal input terminal of the current transformer (2) is fixedly connected in the inner cavity of the base shell (1). A secondary contact block (4) is fixedly connected to one end of the cable (3) near the current transformer (2). A main contact block (5) is fixedly connected to the side of the secondary contact block (4) away from the cable (3). The end of the main contact block (5) near the current transformer (2) is fixedly connected to the outer wall of the current transformer (2). A grounding drain for excluding residual charge and short-circuit current is fixedly connected to the inner wall of the base shell (1). The grounding discharge block (6) is used to transfer the residual charge and short-circuit current generated when the current transformer (2) or the closed loop fails. Both ends of the current transformer (2) are provided with a splitting structure (7) for pushing the secondary contact block (4) to disconnect from the main contact block (5). The splitting structure (7) is used to quickly cut off the signal transmission path when the current transformer (2) fails. The top and bottom of the current transformer (2) are provided with a rotating structure (8) for pushing the secondary contact block (4) to flip. The rotating structure (8) is used to push the secondary contact block (4) to flip so that the conductive end of the secondary contact block (4) is connected to the grounding discharge block (6).

2. The current monitoring instrument for a power grid stability loop-closing operation device according to claim 1, characterized in that, The splitting structure (7) includes a sliding plate (701), which is slidably connected to the inner cavity of the base shell (1). The end of the sliding plate (701) near the secondary contact block (4) is rotatably connected by a pin to an inclined rod (702) for pushing the secondary contact block (4) to separate from the main contact block (5). The end of the inclined rod (702) away from the sliding plate (701) is fixedly rotatably connected to a clamping block (703).

3. The current monitoring instrument for a power grid stability loop-closing operation device according to claim 1, characterized in that, The rotating structure (8) includes a fixed rack (801), which is fixedly connected to the inner cavity of the base shell (1). A connecting rod (802) is fixedly connected to one side of the secondary contact block (4). There are two connecting rods (802), and the two connecting rods (802) are fixedly connected between the four secondary contact blocks (4). A rotating gear (803) for driving the secondary contact block (4) to rotate is fixedly connected to the inner cavity of the connecting rod (802).

4. The current monitoring instrument for a power grid stability loop-closing operation device according to claim 3, characterized in that, Both ends of the grounding discharge block (6) are fixedly connected to a connecting shell (601), and the inner cavity of the connecting shell (601) is fixedly connected to a spring (602) for pushing the grounding discharge block (6) and the secondary contact block (4) to fit tightly together.

5. The current monitoring instrument for a power grid stability loop-closing operation device according to claim 4, characterized in that, The outer wall of the secondary contact block (4) is fixedly connected to an arc-shaped flexible plate (806) for pressing the grounding discharge block (6), and the arc-shaped flexible plate (806) retracts when the secondary contact block (4) is flipped.

6. The current monitoring instrument for a power grid stability loop-closing operation device according to claim 1, characterized in that, The outer wall of the base shell (1) is fixedly connected to a display screen (101) for displaying real-time loop current monitoring data. Below the display screen (101) is a button (102) for adjusting parameters. On one side of the button (102) is a status indicator light (103) for visually indicating faults. Between the button (102) and the status indicator light (103) is a loudspeaker (104) for emitting alarm sounds.

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