Intelligent power distribution cabinet for power grid monitoring combined action protection and protection method thereof

Abstract

The invention relates to the technical field of intelligent power grids, in particular to an intelligent power grid monitoring combined action protection power distribution cabinet and a protection method thereof.The intelligent power grid monitoring combined action protection power distribution cabinet comprises a cabinet body and a bearing plate fixed in the cabinet body, a heat conduction pipe is arranged on the bearing plate, an iron core is arranged at the end of the heat conduction pipe, and an electrified coil is wound around the iron core; the electromagnetic regulation and control mechanism is arranged in the heat conduction pipe, the electromagnetic regulation and control mechanism comprises a rotating disc, the bearing plate is provided with a multi-stage response mechanism matched with the rotating disc, and the electromagnetic regulation and control mechanism can drive the rotating disc to rotate when the current flowing through the electrified coil changes and drive the rotating disc to rotate when the rotating disc rotates to a specific angle. The multi-stage response mechanism is controlled to execute alarming and flow limiting actions; the power-off limiting mechanism is arranged on the bearing plate and matched with the rotating disc, and response and processing are conducted in time according to different fluctuation values of current in a multi-stage control mode.

Description

Technical Field

[0001] The present invention relates to the technical field of smart grids, and specifically to a power distribution cabinet with intelligent grid monitoring and combined action protection and its protection method. Background Art

[0002] The main function of the power distribution cabinet is to distribute electric energy from a power source (such as a transformer) to each electrical equipment. Through the internal switching equipment and wires, it distributes electric energy to each branch circuit according to different voltage levels and current magnitudes.

[0003] The protection device is an important component in the power distribution cabinet to ensure the safe operation of the electrical system. Common protection devices include fuses, leakage protectors, overvoltage protectors, etc. These protection devices can quickly respond when an overload or short - circuit fault occurs in the circuit and perform a disconnection action on the circuit.

[0004] When an overload or short - circuit occurs in the circuit, no matter which protection device it is, it basically performs a power - off action according to a preset fixed threshold. However, when starting or stopping an electrical appliance or switching gears in industrial equipment, an instantaneous current spike may be generated, and this current can reach several times the rated current.

[0005] The single - action logic of the existing protection devices cannot take differentiated measures for different fault levels (such as minor overload, severe short - circuit), resulting in waste of resources or insufficient protection, and frequent false tripping will also affect the continuity of production. Summary of the Invention

[0006] The purpose of the present invention is to provide a power distribution cabinet with intelligent grid monitoring and combined action protection and its protection method to solve the problems raised in the above - mentioned background art.

[0007] To achieve the above purpose, the present invention provides the following technical solutions: A power distribution cabinet with intelligent grid monitoring and combined action protection, comprising: A cabinet body, and a receiving plate fixed inside the cabinet body. A heat conduction tube is arranged on the receiving plate, an iron core is arranged at the end of the heat conduction tube, and an energized coil is wound around the iron core; It further includes: An electromagnetic regulation mechanism arranged inside the heat conduction tube. The electromagnetic regulation mechanism includes a rotating disk. A multi - level response mechanism cooperating with the rotating disk is arranged on the receiving plate. The electromagnetic regulation mechanism can drive the rotating disk to rotate when the current flowing through the energized coil changes, and when the rotating disk rotates to a specific angle, it controls the multi - level response mechanism to perform an alarm and current - limiting action; A power - off limiting mechanism arranged on the receiving plate and cooperating with the rotating disk. The rotating disk can control the power - off limiting mechanism to perform a power - off action when the current is overloaded.

[0008] As a further solution of the present invention: the electromagnetic control mechanism includes a rotating rod rotatably installed in the heat conducting tube for driving the rotating disk to rotate, a guide column is arranged in the heat conducting tube, and a limit ring is arranged on the guide column.

[0009] As a further solution of the present invention: the electromagnetic control mechanism further comprises a movable sleeve sliding along the axial direction of the rotating rod, the movable sleeve is provided with a magnetic suction cup sliding along the axial direction of the guide column and abutting against the limit ring, the rotating rod is sleeved with a fourth spring, and the two ends of the fourth spring abut against the magnetic suction cup and the inner wall of the heat conducting tube respectively; It also includes a variable pitch spiral groove formed on the circumferential outer wall of the rotating rod, and a limit block is arranged in the movable sleeve and is slidably engaged with the variable pitch spiral groove.

[0010] As a further solution of the present invention: the power-off limiting mechanism comprises a first support plate fixed on the receiving plate, a first conductive plate connected to the energized coil is arranged on the first support plate, a movable rod is slidably mounted on the first support plate, and a second conductive plate is arranged on the movable rod to abut against the first conductive plate; It also includes a guide component and a switch component which are arranged on the movable rod and connected to the rotating disk and are used to adjust the abutment state of the second conductive plate and the first conductive plate.

[0011] As a further solution of the present invention: the guide assembly includes an arc groove and a limiting hole formed on the rotating disk, the movable rod is provided with a fixing ring matched with the limiting hole, and the movable rod is slidably engaged with the arc groove.

[0012] As a further solution of the present invention: the switch assembly includes a first spring sleeved on the movable rod, the two ends of the first spring are respectively abutted against the second conductive plate and the first support plate, a power switch is rotatably installed on the supporting plate, a slot is formed on the power switch, and a limit column is provided on the movable rod and is slidably engaged with the slot.

[0013] As a further solution of the present invention: the multi-level response mechanism includes a first step guide rail and a second step guide rail formed on the circumferential outer wall of the rotating disk, and a second support plate is symmetrically arranged on the supporting plate, and an alarm component and a current limiting component for performing alarm and current limiting actions are arranged on the second support plate.

[0014] As a further solution of the present invention: The alarm component includes a first support rod slidably mounted on the second support plate. A first limiting wheel that abuts and cooperates with the first stepped guide rail is provided at the end of the first support rod. A second spring is sleeved on the first support rod, and both ends of the second spring abut against the second support plate and the first limiting wheel respectively; It further includes a static contact fixed on the second support plate, and a moving contact that abuts and cooperates with the static contact is provided on the first support rod.

[0015] As a further solution of the present invention: The current limiting mechanism includes a second support rod slidably mounted on the second support plate. A second limiting wheel that abuts and cooperates with the second stepped guide rail is provided at the end of the second support rod. A third spring is sleeved on the second support rod, and both ends of the third spring abut against the second support plate and the second limiting wheel respectively; It further includes a resistance regulator fixed on the receiving plate, and an adjusting plate that is slidably connected to the resistance regulator is provided on the second support rod.

[0016] A protection method for a power distribution cabinet with intelligent power grid monitoring joint action protection includes the following steps: Step 1: When the current flowing through the energized coil fluctuates slightly, the magnetic force generated by the iron core and the energized coil is small, and the angle of the rotating disk will not change; Step 2: When the current flowing through the energized coil fluctuates greatly, the magnetic force generated by the iron core and the energized coil increases, and drives the electromagnetic control mechanism to move to control the rotation of the rotating disk; Step 3: When the rotating disk rotates to a specific angle, the multi-stage response mechanism will correspondingly perform alarm and current limiting actions; Step 4: When the current flowing through the energized coil exceeds the safety value, the rotating disk will control the power-off limiting mechanism to move to perform the power-off action.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This application can perform hierarchical protection on the power distribution cabinet through the cooperation of the multi-stage response mechanism and the power-off limiting mechanism, so as to prevent frequent false tripping caused by power-off at a fixed threshold, which affects the continuity of production. Specifically, when the current fluctuates slightly, under the action of the electromagnetic control mechanism, the rotation of the rotating disk is controlled to control the operation of the multi-stage response mechanism, and the corresponding alarm and current limiting actions are performed, thus avoiding the problem of frequent tripping. When the current is severely overloaded or short-circuited, the electromagnetic control mechanism controls the rapid rotation of the rotating disk, and controls the circuit to be disconnected through the power-off limiting mechanism to protect the power distribution cabinet.

[0018] When the current returns to the normal value, the magnetic force applied to the magnetic chuck also returns to the initial state. At this time, the fourth spring controls the magnetic chuck to reset, causing the rotating disk to return to the initial angle. Under the action of the first stepped guide rail and the second stepped guide rail, the first limiting wheel and the second limiting wheel return to the position where they abut against the protruding end, so that the moving contact is separated from the static contact, and the resistance value of the resistance regulator is again at the minimum value.

[0019] When the circuit is disconnected, the magnetic force on the magnetic chuck disappears. The fourth spring controls the magnetic chuck to move towards the initial position, causing the rotating disk to rotate towards the initial angle, so that the limiting hole and the fixed ring are staggered from each other. Under the action of the fixed ring, the movable rod cannot be reset, thus ensuring that the second conductive plate and the first conductive plate are always in a separated state, so as to achieve that before the circuit inspection is completed, the power-on switch cannot be directly pushed to the power-connected position, which can not only ensure the safety of maintenance personnel, but also ensure that there will be no problem of directly connecting the power due to misoperation, resulting in damage to the internal parts of the power distribution cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of an embodiment of a power distribution cabinet for intelligent power grid monitoring combined action protection.

[0021] Figure 2 It is a schematic structural diagram inside the cabinet body in an embodiment of a power distribution cabinet for intelligent power grid monitoring combined action protection.

[0022] Figure 3 It is a schematic connection relationship diagram of a multi-stage response mechanism, a partial power-off limiting mechanism, and a heat conduction tube in an embodiment of a power distribution cabinet for intelligent power grid monitoring combined action protection.

[0023] Figure 4 It is a schematic structural diagram of a multi-stage response mechanism, a partial power-off limiting mechanism, an iron core, and an energized coil in an embodiment of a power distribution cabinet for intelligent power grid monitoring combined action protection.

[0024] Figure 5 It is a schematic structural diagram of a multi-stage response mechanism and a partial power-off limiting mechanism in an embodiment of a power distribution cabinet for intelligent power grid monitoring combined action protection.

[0025] Figure 6 It is a schematic structural diagram of a power-off limiting mechanism, a rotating disk, and a rotating rod in an embodiment of a power distribution cabinet for intelligent power grid monitoring combined action protection.

[0026] Figure 7 It is a schematic structural diagram of an electromagnetic regulation mechanism and a rotating disk in an embodiment of a power distribution cabinet for intelligent power grid monitoring combined action protection.

[0027] Figure 8Explosion structure schematic diagram of the electromagnetic regulation mechanism and the rotating disk in an embodiment of a power distribution cabinet for intelligent power grid monitoring combined action protection.

[0028] Figure 9 Explosion structure schematic diagram of the power-off limit mechanism and the rotating disk in an embodiment of a power distribution cabinet for intelligent power grid monitoring combined action protection.

[0029] Figure 10 Structure schematic diagram of part of the multi-stage response mechanism in an embodiment of a power distribution cabinet for intelligent power grid monitoring combined action protection.

[0030] In the figure: 1, cabinet body; 2, bearing plate; 3, iron core; 4, energized coil; 5, heat conduction tube; 6, rotating rod; 601, variable pitch spiral groove; 7, guide post; 701, limit ring; 8, movable sleeve; 801, limit block; 9, magnetic chuck; 10, rotating disk; 1001, arc groove; 1002, limit hole; 11, first stepped guide rail; 12, second stepped guide rail; 13, first conductive plate; 14, first support plate; 15, movable rod; 16, fixed ring; 17, second conductive plate; 18, first spring; 19, limit post; 20, power-on switch; 21, second support plate; 22, first support rod; 23, first limit wheel; 24, second spring; 25, moving contact; 26, static contact; 27, second support rod; 28, second limit wheel; 29, third spring; 30, adjusting plate; 31, resistance regulator; 32, fourth spring. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] In addition, an element in the present invention is referred to as being "fixed to" or "disposed on" another element, and it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manners.

[0033] Please refer to Figures 1 to 10 , in the embodiment of the present invention, a power distribution cabinet for intelligent power grid monitoring combined action protection includes: Cabinet 1, and a receiving plate 2 fixed inside the cabinet 1. A heat conduction tube 5 is provided on the receiving plate 2. An iron core 3 is provided at the end of the heat conduction tube 5, and an energized coil 4 is wound around the iron core 3; It further includes: An electromagnetic control mechanism is provided inside the heat conduction tube 5. The electromagnetic control mechanism includes a rotating disk 10. A multi-stage response mechanism cooperating with the rotating disk 10 is provided on the receiving plate 2. When the current flowing through the energized coil 4 changes, the electromagnetic control mechanism can drive the rotating disk 10 to rotate, and when the rotating disk 10 rotates to a specific angle, it controls the multi-stage response mechanism to perform alarm and current limiting actions; A power-off limiting mechanism is provided on the receiving plate 2 and cooperates with the rotating disk 10. When the current is overloaded, the rotating disk 10 can control the power-off limiting mechanism to perform a power-off action.

[0034] Specifically, when the current flowing through the energized coil 4 is at a normal value, the electromagnetic control mechanism will not move, so that the angle of the rotating disk 10 will not change. When the current flowing through the energized coil 4 fluctuates and the duration is short, in this case, there is no need to perform a power-off process. The magnetic force generated by the energized coil 4 and the iron core 3 increases. Under the action of the electromagnetic control mechanism, the rotating disk 10 is controlled to rotate to control the multi-stage response mechanism to work and perform an alarm action. If the overload situation persists, the rotation angle of the rotating disk 10 increases to perform a current limiting action through the multi-stage response mechanism and temporarily reduce the current magnitude. If a serious overload or short circuit occurs, the current flowing through the energized coil 4 exceeds the safety threshold, and the rotating disk 10 continues to rotate to control the circuit to be disconnected through the power-off limiting mechanism. And under the action of the power-off limiting mechanism, it can prevent the problem of damage to the internal parts of the power distribution cabinet or injury to personnel caused by closing the switch due to misoperation before the circuit inspection is completed.

[0035] Preferably, through the cooperation of the multi-stage response mechanism and the power-off limiting mechanism, the fault types can be more accurately distinguished and the protection strategy can be optimized. At the same time, through the optimized design of the mechanical structure, it is ensured that the response speed of the final power-off action is not affected, and the phenomenon of frequent mis-tripping caused by large instantaneous current spikes generated when industrial equipment starts or switches is avoided.

[0036] Please refer to Figures 1 to 3 、 Figures 6 to 8, the electromagnetic control mechanism includes a rotating rod 6 rotatably installed in the heat conduction tube 5 for driving the rotating disk 10 to rotate. A guiding column 7 is arranged in the heat conduction tube 5, and a limiting ring 701 is arranged on the guiding column 7. The electromagnetic control mechanism further includes a movable sleeve 8 sliding axially along the rotating rod 6. A magnetic suction cup 9 is arranged on the movable sleeve 8 and slides axially along the guiding column 7 and is in contact and cooperation with the limiting ring 701. A fourth spring 32 is sleeved on the rotating rod 6, and both ends of the fourth spring 32 are in contact with the magnetic suction cup 9 and the inner wall of the heat conduction tube 5 respectively; it further includes a variable pitch spiral groove 601 formed on the circumferential outer wall of the rotating rod 6, and a limiting block 801 slidingly engaged with the variable pitch spiral groove 601 is arranged in the movable sleeve 8.

[0037] Specifically, the magnetic suction cup 9 divides the heat conduction tube 5 into two cavities. An expansion gas is filled in the cavity on the side of the magnetic suction cup 9 facing the rotating disk 10, and the expansion coefficient of this expansion gas is greater than that of air. In the initial state, the current flowing through the energized coil 4 is within the normal range, the generated magnetic force is small, and the temperature in the heat conduction tube 5 is low, so that the expansion gas is in a contracted state, while the fourth spring 32 is in a compressed state, and the thrust provided by the fourth spring 32 to the magnetic suction cup 9 is greater than the magnetic force and the acting force of the expansion gas. Therefore, the magnetic suction cup 9 is located at the position in contact with the limiting ring 701. At this time, the limiting block 801 is located at the end of the stroke on the side of the variable pitch spiral groove 601 facing the rotating disk 10; If there is a switch of industrial equipment or a power switching, the generated instantaneous current fluctuation is large, and the current value flowing through the energized coil 4 increases. Therefore, the magnetic force acting on the magnetic suction cup 9 increases. When the magnetic force is greater than the thrust of the fourth spring 32, the magnetic suction cup 9 will move in the direction away from the rotating disk 10, thereby driving the movable sleeve 8 to move, so that the limiting block 801 slides along the variable pitch spiral groove 601. Under the action of the limiting block 801 and the variable pitch spiral groove 601, the rotating rod 6 rotates to drive the rotating disk 10 to rotate. Under the action of the rotating disk 10, the multi-stage response mechanism works to perform an alarm action; If the current is still in an increasing state, the rotating disk 10 will continue to rotate. Under the action of the multi-stage response mechanism, a current limiting action is performed to shunt the current, thereby protecting the equipment. If the equipment has a short circuit or serious overload, the generated magnetic force will further increase. At the same time, when the current increases, the heat generated in the power distribution cabinet will increase rapidly and be conducted to the heat conduction tube 5, causing the expansion gas to expand. Under the dual action of the driving force of the expansion gas and the magnetic force, the rotating disk 10 is quickly controlled to rotate, thereby controlling the power-off limiting mechanism to work and quickly disconnecting the circuit.

[0038] Preferably, the variable-pitch spiral groove 601 is arranged with variable pitch, and starting from the end facing the rotating disk 10, its pitch is in a gradually decreasing state. Therefore, when the magnetic chuck 9 moves axially along the guide post 7, under the action of the limiting block 801 and the variable-pitch spiral groove 601, when the movable sleeve 8 moves the same distance, the angle that the rotating rod 6 can rotate gradually increases. Thus, in the case of a short circuit or severe overload in the circuit, through the magnetic force action caused by temperature change, the rotating disk 10 can be quickly controlled to rotate to the required angle, and the circuit is disconnected by the power-off limiting mechanism.

[0039] Please refer to Figures 3 to 5 、 Figure 10 , the multi-level response mechanism includes a first stepped guide rail 11 and a second stepped guide rail 12 formed on the circumferential outer wall of the rotating disk 10. The second support plates 21 are symmetrically arranged on the receiving plate 2. An alarm component and a current-limiting component for performing alarm and current-limiting actions are arranged on the second support plates 21. Among them, the alarm component includes a first support rod 22 slidably mounted on the second support plate 21. A first limiting wheel 23 that abuts and cooperates with the first stepped guide rail 11 is arranged at the end of the first support rod 22. A second spring 24 is sleeved on the first support rod 22, and both ends of the second spring 24 abut against the second support plate 21 and the first limiting wheel 23 respectively; it further includes a static contact 26 fixed on the second support plate 21, and a moving contact 25 that abuts and cooperates with the static contact 26 is arranged on the first support rod 22. The current-limiting mechanism includes a second support rod 27 slidably mounted on the second support plate 21. A second limiting wheel 28 that abuts and cooperates with the second stepped guide rail 12 is arranged at the end of the second support rod 27. A third spring 29 is sleeved on the second support rod 27, and both ends of the third spring 29 abut against the second support plate 21 and the second limiting wheel 28 respectively; it further includes a resistance regulator 31 fixed on the receiving plate 2, and an adjusting plate 30 that is slidably connected to the resistance regulator 31 is arranged on the second support rod 27.

[0040] It should be noted that the moving contact 25 and the static contact 26 can control the operation of the alarm. The first stepped guide rail 11 and the second stepped guide rail 12 are respectively arranged on the circumferential outer wall of the rotating disc 10, and both can be divided into two sections. The first section is the protruding end, and the second section is the concave end. Moreover, the size of the protruding end of the first stepped guide rail 11 is smaller than that of the protruding end of the second stepped guide rail 12. In the initial state, the first limiting wheel 23 and the second limiting wheel 28 are respectively located at the positions where they abut against the protruding ends of the first stepped guide rail 11 and the second stepped guide rail 12, so that the distances between the first support rod 22 and the second support rod 27 and the rotating rod 6 are the largest. The second spring 24 and the third spring 29 are both in a compressed state, so that both the first limiting wheel 23 and the second limiting wheel 28 have a tendency to move towards the rotating rod 6. Under the action of the first support rod 22, the moving contact 25 and the static contact 26 are in a separated state. Under the action of the second support rod 27, the resistance value provided by the resistance regulator 31 in the circuit is controlled to be in the minimum state through the adjusting plate 30.

[0041] If only the start / stop or gear shift of industrial equipment causes the current flowing through the energized coil 4 to increase, the magnetic force generated by the energized coil 4 and the iron core 3 will increase, thereby driving the magnetic chuck 9 to move away from the rotating disc 10. Under the action of the limiting block 801 and the variable pitch spiral groove 601, the rotating rod 6 rotates to drive the rotating disc 10 to rotate, and the positions of the first stepped guide rail 11 and the second stepped guide rail 12 will change. When the protruding end of the first stepped guide rail 11 separates from the first limiting wheel 23, the protruding end of the second stepped guide rail 12 is still in contact with the second limiting wheel 28. At this time, the second spring 24 elastically releases and drives the first limiting wheel 23 to move to the position where it abuts against the concave end of the first stepped guide rail 11 through the first support rod 22. At the same time, the first support rod 22 will also drive the moving contact 25 to move towards the static contact 26 and abut against the static contact 26. Under the action of the moving contact 25 and the static contact 26, the alarm is controlled to work without directly cutting off the power to avoid misoperation.

[0042] If the current is still increasing and does not exceed the maximum load, the heat and magnetic force generated by the current flow will increase, causing the expansion gas to expand. Under the action of the gas driving force and the electromagnetic force, the magnetic chuck 9 is controlled to continue moving, increasing the rotation angle of the rotating disc 10 to further change the position of the second stepped guide rail 12. When the protruding end of the second stepped guide rail 12 separates from the second limiting wheel 28, the third spring 29 elastically releases and pushes the second limiting wheel 28 to move to the position where it abuts against the concave end of the second stepped guide rail 12 through the second support rod 27. The second support rod 27 will also drive the adjusting plate 30 to move to increase the resistance value provided by the resistance regulator 31 in the circuit. Under the action of the resistance regulator 31, a current shunting action is performed on the current to prevent problems caused by excessive current that may damage the equipment.

[0043] Preferably, when the current returns to the normal value, the magnetic force applied to the magnetic chuck 9 also returns to the initial state. At this time, the fourth spring 32 controls the magnetic chuck 9 to reset, so that the rotating disk 10 returns to the initial angle. Under the action of the first stepped guide rail 11 and the second stepped guide rail 12, the first limit wheel 23 and the second limit wheel 28 return to the position where they abut against the protruding end, so that the moving contact 25 is separated from the static contact 26, and the resistance value of the resistance regulator 31 is again at the minimum value.

[0044] Please refer to Figures 3 to 9 The power-off limiting mechanism includes a first support plate 14 fixed on the receiving plate 2. A first conductive plate 13 connected to the energizing coil 4 is provided on the first support plate 14. A movable rod 15 is slidably mounted on the first support plate 14. A second conductive plate 17 in abutting cooperation with the first conductive plate 13 is provided on the movable rod 15. It further includes a guiding component and a switching component provided on the movable rod 15 and connected to the rotating disk 10 for adjusting the abutting state between the second conductive plate 17 and the first conductive plate 13. The guiding component includes an arc groove 1001 and a limiting hole 1002 formed on the rotating disk 10. A fixing ring 16 cooperating with the limiting hole 1002 is provided on the movable rod 15. The movable rod 15 is slidably fitted into the arc groove 1001. The switching component includes a first spring 18 sleeved on the movable rod 15. The two ends of the first spring 18 respectively abut against the second conductive plate 17 and the first support plate 14. An energizing switch 20 is rotatably mounted on the receiving plate 2. A clamping groove is formed on the energizing switch 20. A limiting post 19 slidably fitted into the clamping groove is provided on the movable rod 15.

[0045] Furthermore, in the initial state, the magnetic chuck 9 is at the end of the stroke in the direction towards the rotating disk 10, so that the movable rod 15 passes through the arc groove 1001 and is at the end of the stroke on the side of the arc groove 1001 away from the limiting hole 1002, so that the fixing ring 16 abuts against the rotating disk 10. Under the action of the fixing ring 16, the second conductive plate 17 and the first conductive plate 13 are controlled to be in a fitting state, so that the entire circuit is in an on state. At this time, the compression amount of the first spring 18 is the largest, and the movable rod 15 also controls the included angle between the energizing switch 20 and the movable rod 15 to be the largest through the limiting post 19 and the clamping groove, so that the energizing switch 20 is in the power-on position.

[0046] If the current fluctuation is small and the rotation angle of the rotating disk 10 is small, under the action of the multi-stage response mechanism, alarm and current limiting actions can be performed. It can not only realize timely alarm and current limiting actions when surge current occurs due to equipment startup or gear shifting and other actions to ensure the normal operation of the equipment, but also avoid the problem of frequent mis-tripping when the current does not continuously overload, which affects production continuity. When the current is in a continuous overload or short - circuit situation, under the action of magnetic force and the thrust of expanding gas, the magnetic chuck 9 moves rapidly. Through the rapid response of the variable - pitch spiral groove 601 and the limit block 801, the control lever 6 rotates rapidly, thereby controlling the rotation of the rotating disk 10. The limit post 19 will slide within the arc groove 1001 relative to the rotating disk 10 and rapidly approach the limit hole 1002 until the limit post 19 enters the limit hole 1002. At this time, the first spring 18 elastically releases and rapidly pushes the movable rod 15 away from the rotating disk 10 through the second conductive plate 17, causing the fixed ring 16 to pass through the limit hole 1002. The second conductive plate 17 will separate from the first conductive plate 13, disconnecting the circuit. At the same time, the movable rod 15 will also drive the limit post 19 to move, and under the action of the card slot, the power - on switch 20 will move to the power - off position.

[0047] Preferably, when the circuit is disconnected, the magnetic force on the magnetic chuck 9 disappears. The fourth spring 32 controls the magnetic chuck 9 to move towards the initial position, causing the rotating disk 10 to rotate towards the initial angle, so that the limit hole 1002 and the fixed ring 16 are staggered from each other. Under the action of the fixed ring 16, the movable rod 15 cannot be reset, thus ensuring that the second conductive plate 17 and the first conductive plate 13 are always in a separated state. Before the circuit inspection is completed, the power - on switch 20 cannot be directly pushed to the power - on position, which can ensure the safety of maintenance personnel and prevent the problem of internal parts of the power distribution cabinet being damaged due to accidental connection of electricity caused by misoperation.

[0048] A protection method for a power distribution cabinet with intelligent power grid monitoring and joint - action protection includes the following steps: Step 1: When the current flowing through the energizing coil 4 fluctuates slightly, the magnetic force generated by the iron core 3 and the energizing coil 4 is small, and the angle of the rotating disk 10 will not change; Step 2: When the current flowing through the energizing coil 4 fluctuates greatly, the magnetic force generated by the iron core 3 and the energizing coil 4 increases and drives the electromagnetic control mechanism to move to control the rotation of the rotating disk 10; Step 3: When the rotating disk 10 rotates to a specific angle, the multi - level response mechanism will correspondingly perform alarm and current - limiting actions; Step 4: When the current flowing through the energizing coil 4 exceeds the safety value, the rotating disk 10 will control the power - off limiting mechanism to move to perform the power - off action.

[0049] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0050] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A power distribution cabinet for intelligent power grid monitoring and joint action protection, comprising: A cabinet body, and a receiving plate fixed in the cabinet body, wherein a heat conducting pipe is arranged on the receiving plate, an iron core is arranged at the end of the heat conducting pipe, and an energized coil is wound around the iron core; It is characterized by further comprising: An electromagnetic control mechanism is arranged in the heat conducting tube, the electromagnetic control mechanism comprises a rotating disk, and a multi-level response mechanism cooperating with the rotating disk is arranged on the receiving plate, the electromagnetic control mechanism can drive the rotating disk to rotate when the current flowing through the energized coil changes, and when the rotating disk rotates to a specific angle, the multi-level response mechanism is controlled to perform alarm and current limiting actions; A power-off limiting mechanism is arranged on the receiving plate and cooperates with the rotating disk. When the current is overloaded, the rotating disk can control the power-off limiting mechanism to perform a power-off action.

2. The intelligent power grid monitoring and combined action protection distribution cabinet according to claim 1 is characterized in that: The electromagnetic control mechanism comprises a rotating rod rotatably mounted in the heat conducting tube and used for driving the rotating disk to rotate. A guide column is arranged in the heat conducting tube, and a limit ring is arranged on the guide column.

3. The intelligent power grid monitoring and combined action protection distribution cabinet according to claim 2 is characterized in that: The electromagnetic control mechanism further includes a movable sleeve that slides axially along the rotating rod, the movable sleeve is provided with a magnetic suction cup that slides axially along the guide column and abuts against the limit ring, and a fourth spring is sleeved on the rotating rod, and two ends of the fourth spring abut against the magnetic suction cup and the inner wall of the heat conducting pipe respectively; It also includes a variable pitch spiral groove formed on the circumferential outer wall of the rotating rod, and a limit block is arranged in the movable sleeve and is slidably engaged with the variable pitch spiral groove.

4. The intelligent power grid monitoring and combined action protection distribution cabinet according to claim 1 is characterized in that: The power-off limiting mechanism comprises a first supporting plate fixed to the receiving plate, a first conductive plate connected to the energized coil is arranged on the first supporting plate, a movable rod is slidably mounted on the first supporting plate, and a second conductive plate is arranged on the movable rod to abut against the first conductive plate; It also includes a guide component and a switch component which are arranged on the movable rod and connected to the rotating disk and are used to adjust the abutment state of the second conductive plate and the first conductive plate.

5. The intelligent power grid monitoring and combined action protection distribution cabinet according to claim 4 is characterized in that: The guide assembly includes an arc groove and a limiting hole formed on the rotating disk, a fixing ring matched with the limiting hole is arranged on the movable rod, and the movable rod is slidably engaged with the arc groove.

6. The intelligent power grid monitoring combined action protection distribution cabinet according to claim 5 is characterized in that: The switch assembly includes a first spring sleeved on the movable rod, the two ends of the first spring are respectively abutted against the second conductive plate and the first support plate, a power switch is rotatably mounted on the receiving plate, a slot is formed on the power switch, and a limit column is provided on the movable rod and slidably engaged with the slot.

7. The intelligent power grid monitoring and combined action protection distribution cabinet according to claim 1 is characterized in that: The multi-stage response mechanism includes a first step guide rail and a second step guide rail formed on the circumferential outer wall of the rotating disk, and a second support plate is symmetrically arranged on the receiving plate, and an alarm component and a current limiting component for performing alarm and current limiting actions are arranged on the second support plate.

8. The intelligent power grid monitoring and combined action protection distribution cabinet according to claim 7 is characterized in that: The alarm assembly comprises a first support rod slidably mounted on the second support plate, a first limit wheel which abuts against the first step guide rail is disposed at the end of the first support rod, a second spring is sleeved on the first support rod, and two ends of the second spring abut against the second support plate and the first limit wheel respectively; It also includes a stationary contact fixed on the second support plate, and the first support rod is provided with a moving contact that abuts against the stationary contact.

9. The intelligent power grid monitoring combined action protection distribution cabinet according to claim 8 is characterized in that: The current limiting mechanism comprises a second support rod slidably mounted on the second support plate, a second limiting wheel abutting against the second step guide rail is arranged at the end of the second support rod, a third spring is sleeved on the second support rod, and two ends of the third spring abut against the second support plate and the second limiting wheel respectively; It also includes a resistance adjuster fixed on the receiving plate, and the second support rod is provided with an adjustment plate slidably connected with the resistance adjuster.

10. A method for protecting a distribution cabinet with intelligent power grid monitoring and joint action protection, using the distribution cabinet with intelligent power grid monitoring and joint action protection as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: When the current flowing through the energized coil fluctuates slightly, the magnetic force generated by the iron core and the energized coil is small, and the angle of the rotating disk will not change; Step 2: When the current flowing through the energized coil fluctuates greatly, the magnetic force generated by the iron core and the energized coil increases, and drives the electromagnetic control mechanism to move, thereby controlling the rotation of the rotating disk; Step 3: When the rotating disk rotates to a specific angle, the multi-level response mechanism will correspondingly execute alarm and current limiting actions; Step 4: When the current flowing through the energized coil exceeds the safe value, the rotating disk will control the movement of the power-off limit mechanism to perform the power-off action.

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