A power distribution cabinet with intelligent grid monitoring combined action protection and a protection method thereof

Abstract

The application relates to the technical field of smart power grids, in particular to a power distribution cabinet with intelligent power grid monitoring combined action protection and a protection method thereof, which comprises a cabinet body, a receiving plate fixed in the cabinet body, a heat pipe arranged on the receiving plate, an iron core arranged at the end of the heat pipe, and a power-on coil wound on the iron core; an electromagnetic control mechanism arranged in the heat pipe, wherein the electromagnetic control mechanism comprises a rotating disc, a multistage response mechanism matched with the rotating disc is arranged on the receiving plate, the electromagnetic control mechanism can drive the rotating disc to rotate when the current flowing through the power-on coil changes, and the multistage response mechanism is controlled to execute alarm and current limiting actions when the rotating disc rotates to a specific angle; and a power-off limiting mechanism arranged on the receiving plate and matched with the rotating disc, which realizes timely response and treatment for different fluctuation values of the current through multistage control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of smart grid, in particular to a power distribution cabinet with intelligent grid monitoring combined action protection and a protection method thereof. BACKGROUND

[0002] The main function of the power distribution cabinet is to distribute electric energy from the power source (such as transformer) to various electrical equipment. It distributes electric energy to various branch circuits according to different voltage levels and current sizes through internal switching devices and wires.

[0003] The protection device is an important component in the power distribution cabinet for ensuring 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 disconnect action on the circuit.

[0004] When an overload or short circuit occurs in the circuit, regardless of which protection device, the basic action is to perform a power-off action according to the pre-set fixed threshold. However, in industrial equipment, the start-stop or gear switching of electrical appliances may produce a transient current spike, which can reach several times the rated current.

[0005] The single action logic of existing protection devices cannot take differentiated measures for different fault levels (such as slight overload and serious short circuit), resulting in resource waste or insufficient protection, and frequent false tripping, which also affects the continuity of production. SUMMARY

[0006] The purpose of the present application is to provide a power distribution cabinet with intelligent grid monitoring combined action protection and a protection method thereof to solve the problems raised in the background.

[0007] To achieve the above purpose, the present application provides the following technical solutions:

[0008] A power distribution cabinet with intelligent grid monitoring combined action protection, comprising:

[0009] a cabinet body, and a receiving plate fixed in the cabinet body, the receiving plate is provided with a heat pipe, the end of the heat pipe is provided with an iron core, and a power winding is wound on the iron core;

[0010] Further comprising:

[0011] an electromagnetic control mechanism arranged in the heat pipe, the electromagnetic control mechanism comprises a rotating disc, the receiving plate is provided with a multi-stage response mechanism matched with the rotating disc, the electromagnetic control mechanism can drive the rotating disc to rotate when the current flowing through the power winding changes, and control the multi-stage response mechanism to perform alarm and current limiting action when the rotating disc rotates to a specific angle;

[0012] The power-off limiting mechanism is arranged on the receiving plate and cooperates with the rotating disc, and the rotating disc can control the power-off limiting mechanism to perform power-off action when current overload occurs.

[0013] As a further scheme of the present application, the electromagnetic control mechanism comprises a rotating rod rotatably arranged in the heat conducting pipe and used for driving the rotating disc to rotate, and a guide column is arranged in the heat conducting pipe, and a limiting ring is arranged on the guide column.

[0014] As a further scheme of the present application, the electromagnetic control mechanism further comprises a movable sleeve axially sliding along the rotating rod, a magnetic suction disc axially sliding along the guide column and abuttingly cooperating with the limiting ring is arranged on the movable sleeve, a fourth spring is sleeved on the rotating rod, and two ends of the fourth spring respectively abut against the magnetic suction disc and the inner wall of the heat conducting pipe.

[0015] A variable-pitch spiral groove is further formed on the circumferential outer wall of the rotating rod, and a limiting block slidingly and fittingly arranged in the movable sleeve is arranged in the variable-pitch spiral groove.

[0016] As a further scheme of the present application, the power-off limiting mechanism comprises a first supporting plate fixed on the receiving plate, a first conductive plate connected with the power-on coil is arranged on the first supporting plate, and a movable rod is slidingly arranged on the first supporting plate, and a second conductive plate abuttingly cooperating with the first conductive plate is arranged on the movable rod.

[0017] A guide assembly and a switch assembly for adjusting the abutting state of the second conductive plate and the first conductive plate are further arranged on the movable rod and connected with the rotating disc.

[0018] As a further scheme of the present application, the guide assembly comprises a circular arc groove and a limiting hole formed on the rotating disc, a fixing ring cooperating with the limiting hole is arranged on the movable rod, and the movable rod slidingly and fittingly cooperates with the circular arc groove.

[0019] As a further scheme of the present application, the switch assembly comprises a first spring sleeved on the movable rod, two ends of the first spring respectively abut against the second conductive plate and the first supporting plate, a power-on switch is rotatably arranged on the receiving plate, a clamping groove is formed on the power-on switch, and a limiting column slidingly and fittingly arranged in the clamping groove is arranged on the movable rod.

[0020] As a further scheme of the present application, the multi-stage response mechanism comprises a first stepped guide rail and a second stepped guide rail formed on the circumferential outer wall of the rotating disc, a second supporting plate symmetrically arranged is arranged on the receiving plate, and an alarm assembly and a current limiting assembly for performing alarm and current limiting actions are arranged on the second supporting plate.

[0021] As a further scheme of the present application: the alarm assembly comprises a first supporting rod slidingly installed on the second supporting plate, the first supporting rod is provided with a first limiting wheel at the end thereof, the first limiting wheel is in abutting fit with the first stepped guide rail, a second spring is sleeved on the first supporting rod, and two ends of the second spring are in abutting fit with the second supporting plate and the first limiting wheel respectively;

[0022] Further comprising a static contact fixed on the second supporting plate, and a dynamic contact provided on the first supporting rod and in abutting fit with the static contact.

[0023] As a further scheme of the present application: the current limiting assembly comprises a second supporting rod slidingly installed on the second supporting plate, the second supporting rod is provided with a second limiting wheel at the end thereof, the second limiting wheel is in abutting fit with the second stepped guide rail, a third spring is sleeved on the second supporting rod, and two ends of the third spring are in abutting fit with the second supporting plate and the second limiting wheel respectively;

[0024] Further comprising a resistance regulator fixed on the receiving plate, and an adjusting plate provided on the second supporting rod and in sliding connection with the resistance regulator.

[0025] A power distribution cabinet protection method of intelligent power grid monitoring combined action protection, comprising the following steps:

[0026] Step one: when the current fluctuation of the energized coil is small, the magnetic force generated by the iron core and the energized coil is small, and the angle of the rotating disc will not change;

[0027] Step two: when the current fluctuation of the energized coil is large, the magnetic force generated by the iron core and the energized coil increases, and the electromagnetic control mechanism is driven to move to control the rotation of the rotating disc;

[0028] Step three: when the rotating disc rotates to a specific angle, the multi-stage response mechanism will execute the alarm and current limiting actions correspondingly;

[0029] Step four: when the current of the energized coil exceeds the safety value, the rotating disc will control the power-off limiting mechanism to move to execute the power-off action.

[0030] Compared with the prior art, the present application has the following beneficial effects:

[0031] The application can execute hierarchical protection through the cooperation of the multi-stage response mechanism and the power-off limiting mechanism of the power distribution cabinet to prevent frequent mis-tripping caused by fixed threshold power-off, which affects the continuity of production. Specifically, when the current fluctuation is small, the control rotating disc rotates under the action of the electromagnetic regulation mechanism to control the multi-stage response mechanism to work and correspondingly execute alarm and current limiting actions, thereby avoiding frequent tripping. When the current is seriously overloaded or short-circuited, the electromagnetic regulation mechanism controls the rotating disc to rotate rapidly, and the power-off limiting mechanism controls the circuit to be disconnected to protect the power distribution cabinet.

[0032] When the current returns to the normal value, the magnetic force applied to the magnetic suction disc also returns to the initial state. At this time, the fourth spring controls the magnetic suction disc to reset, so that the rotating disc returns to the initial angle. Under the action of the first and second stepped guide rails, the first and second limiting wheels return to the abutting position with the protruding end, so that the moving contact and the stationary contact are separated, and the resistance value of the resistance regulator is again at the minimum value.

[0033] When the circuit is disconnected, the magnetic force on the magnetic suction disc disappears, and the fourth spring controls the magnetic suction disc to move towards the initial position, so that the rotating disc rotates towards the initial angle to make the limiting hole and the fixed ring staggered with each other. Under the action of the fixed ring, the movable rod cannot reset, thereby ensuring that the second and first conductive plates are always in a separated state to ensure that the power-on switch cannot be directly pushed to the power-on position before the circuit inspection is completed, which not only ensures the safety of the maintenance personnel, but also ensures that the power distribution cabinet internal parts will not be damaged due to misoperation. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 Structure schematic diagram of an embodiment of the power distribution cabinet for intelligent power grid monitoring joint action protection.

[0035] Figure 2 Structure schematic diagram of the internal structure of the cabinet body in an embodiment of the power distribution cabinet for intelligent power grid monitoring joint action protection.

[0036] Figure 3 Connection relationship schematic diagram of the multi-stage response mechanism, part of the power-off limiting mechanism and the heat pipe in an embodiment of the power distribution cabinet for intelligent power grid monitoring joint action protection.

[0037] Figure 4 Structure schematic diagram of the multi-stage response mechanism, part of the power-off limiting mechanism, the iron core and the power-on coil in an embodiment of the power distribution cabinet for intelligent power grid monitoring joint action protection.

[0038] Figure 5 Structure schematic diagram of the multi-stage response mechanism and part of the power-off limiting mechanism in an embodiment of the power distribution cabinet for intelligent power grid monitoring joint action protection.

[0039] Figure 6 Structure diagram of power-off limiting mechanism, rotating disc and rotating rod in one embodiment of power distribution cabinet for monitoring joint action protection of intelligent power grid.

[0040] Figure 7 Structure diagram of electromagnetic control mechanism and rotating disc in one embodiment of power distribution cabinet for monitoring joint action protection of intelligent power grid.

[0041] Figure 8 Exploded structure diagram of electromagnetic control mechanism and rotating disc in one embodiment of power distribution cabinet for monitoring joint action protection of intelligent power grid.

[0042] Figure 9 Exploded structure diagram of power-off limiting mechanism and rotating disc in one embodiment of power distribution cabinet for monitoring joint action protection of intelligent power grid.

[0043] Figure 10 Structure diagram of part of multi-stage response mechanism in one embodiment of power distribution cabinet for monitoring joint action protection of intelligent power grid.

[0044] In the figure: 1, cabinet body; 2, bearing plate; 3, iron core; 4, power coil; 5, heat pipe; 6, rotating rod; 601, variable pitch spiral groove; 7, guide column; 701, limiting ring; 8, movable sleeve; 801, limiting block; 9, magnetic suction disc; 10, rotating disc; 1001, circular arc groove; 1002, limiting 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, limiting column; 20, power switch; 21, second support plate; 22, first support rod; 23, first limiting wheel; 24, second spring; 25, moving contact; 26, stationary contact; 27, second support rod; 28, second limiting wheel; 29, third spring; 30, adjusting plate; 31, resistance regulator; 32, fourth spring. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0046] In addition, elements in the present application can be referred to as "fixed" or "set" on another element, which can be directly on another element or can exist with a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or can exist with a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0047] Please refer to Figures 1-10 In an embodiment of the present application, a power distribution cabinet for intelligent power grid monitoring joint action protection comprises:

[0048] A cabinet body 1 and a receiving plate 2 fixed in the cabinet body 1, wherein the receiving plate 2 is provided with a heat pipe 5, the end of the heat pipe 5 is provided with an iron core 3, and the iron core 3 is wound with a power coil 4;

[0049] Further comprising:

[0050] An electromagnetic control mechanism arranged in the heat pipe 5, wherein the electromagnetic control mechanism comprises a rotating disc 10, the receiving plate 2 is provided with a multi-stage response mechanism matched with the rotating disc 10, the electromagnetic control mechanism can drive the rotating disc 10 to rotate when the current flowing through the power coil 4 changes, and control the multi-stage response mechanism to execute an alarm and a current limiting action when the rotating disc 10 rotates to a specific angle;

[0051] A power-off limiting mechanism arranged on the receiving plate 2 and matched with the rotating disc 10, wherein the rotating disc 10 can control the power-off limiting mechanism to execute a power-off action when the current is overloaded.

[0052] Specifically, when the current flowing through the power coil 4 is at a normal value, the electromagnetic control mechanism does not move, so that the angle of the rotating disc 10 does not change. When the current flowing through the power coil 4 fluctuates and the duration is short, no power-off processing is required in this case, the magnetic force generated by the power coil 4 and the iron core 3 increases, under the action of the electromagnetic control mechanism, the rotating disc 10 is controlled to rotate to control the multi-stage response mechanism to work and execute an alarm action. If the overload condition continues, the rotating angle of the rotating disc 10 increases to execute a current limiting action through the multi-stage response mechanism and temporarily reduce the current size. If a serious overload or short circuit occurs, the current flowing through the power coil 4 exceeds the safety threshold, the rotating disc 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 internal parts of the power distribution cabinet or injury to personnel caused by misoperation before the circuit is checked.

[0053] The cooperation of the multi-stage response mechanism and the power-off limiting mechanism can more accurately distinguish the fault types and optimize the protection strategy, and the optimization design of the mechanical structure ensures the response speed of the final power-off action, avoids the frequent mis-tripping phenomenon caused by the large instantaneous current peak fluctuation generated when the industrial equipment is started or switched, and ensures the normal operation of the industrial equipment.

[0054] Please refer to Figures 1-3 、 Figures 6-8 , the electromagnetic control mechanism includes a rotating rod 6 rotatably installed in the heat conducting pipe 5 for driving the rotating disc 10 to rotate, a guide column 7 is arranged in the heat conducting pipe 5, a limiting ring 701 is arranged on the guide column 7, the electromagnetic control mechanism further includes a movable sleeve 8 axially sliding along the rotating rod 6, the movable sleeve 8 is provided with a magnetic suction disc 9 axially sliding along the guide column 7 and abuttingly matched with the limiting ring 701, a fourth spring 32 is sleeved on the rotating rod 6, and the two ends of the fourth spring 32 are respectively in abutment with the magnetic suction disc 9 and the inner wall of the heat conducting pipe 5; a variable-pitch spiral groove 601 is formed on the circumferential outer wall of the rotating rod 6, and the movable sleeve 8 is provided with a limiting block 801 slidingly fitted in the variable-pitch spiral groove 601.

[0055] In detail, the magnetic suction disc 9 divides the heat conducting pipe 5 into two cavities, the cavity located in the direction of the magnetic suction disc 9 towards the rotating disc 10 is filled with an expansion gas, the expansion coefficient of the 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 conducting pipe 5 is low, so that the expansion gas is in a contracted state, and the fourth spring 32 is in a compressed state, and the pushing force provided by the fourth spring 32 to the magnetic suction disc 9 is greater than the magnetic force and the force of the expansion gas, therefore, the magnetic suction disc 9 is located at the abutting position 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 towards the rotating disc 10;

[0056] If the instantaneous current fluctuation is large when the industrial equipment is switched or switched, the current value flowing through the energized coil 4 increases, therefore, the magnetic force acting on the magnetic suction disc 9 increases, when the magnetic force is greater than the pushing force of the fourth spring 32, the magnetic suction disc 9 will move away from the rotating disc 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 disc 10 to rotate, under the action of the rotating disc 10, the multi-stage response mechanism works to perform the alarm action;

[0057] If the current is still increasing, the rotating disc 10 will continue to rotate, and under the action of the multi-stage response mechanism, the current limiting action is performed to shunt the current, thereby protecting the equipment. If the equipment is short-circuited or severely overloaded, the generated magnetic force will further increase, and at the same time, the heat generated in the power distribution cabinet will rapidly increase and be conducted into the heat conduction pipe 5, causing the expansion gas to expand. Under the dual action of the expansion gas pushing force and the magnetic force, the rotating disc 10 is rapidly controlled to rotate, thereby controlling the power-off limiting mechanism to work and causing the circuit to be rapidly disconnected.

[0058] Preferably, the variable pitch helical groove 601 is arranged in a variable pitch manner, and the pitch gradually decreases from the end towards the rotating disc 10. Therefore, when the magnetic suction disc 9 moves axially along the guide column 7, under the action of the limiting block 801 and the variable pitch helical groove 601, the angle that the rotating rod 6 can rotate increases gradually when the movable sleeve 8 moves the same distance, thereby realizing that under the condition that the circuit is short-circuited or severely overloaded, the magnetic force acting through temperature change is used to rapidly control the rotating disc 10 to rotate to the required angle, and the circuit is disconnected through the power-off limiting mechanism.

[0059] Please refer to Figures 3-5 、 Figure 10 , the multi-stage 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 disc 10, and the second support plate 21 is symmetrically arranged on the receiving plate 2. The second support plate 21 is provided with an alarm assembly and a current limiting assembly for performing alarm and current limiting actions, wherein the alarm assembly includes a first support rod 22 slidingly installed on the second support plate 21, and a first limiting wheel 23 is arranged at the end of the first support rod 22 and abuts against the first stepped guide rail 11. A second spring 24 is sleeved on the first support rod 22, and the two ends of the second spring 24 respectively abut against the second support plate 21 and the first limiting wheel 23. A static contact 26 is fixed on the second support plate 21, and a moving contact 25 is arranged on the first support rod 22 and abuts against the static contact 26. The current limiting assembly includes a second support rod 27 slidingly installed on the second support plate 21, and a second limiting wheel 28 is arranged at the end of the second support rod 27 and abuts against the second stepped guide rail 12. A third spring 29 is sleeved on the second support rod 27, and the two ends of the third spring 29 respectively abut against the second support plate 21 and the second limiting wheel 28. An electric resistance regulator 31 is fixed on the receiving plate 2, and an adjusting plate 30 is slidingly connected with the electric resistance regulator 31 on the second support rod 27.

[0060] It should be noted that the movable contact 25 and the static contact 26 can control the alarm to work, the first stepped guide rail 11 and the second stepped guide rail 12 are arranged on the circumferential outer wall of the rotating disc 10, and each can be divided into two sections, the first section is a convex end, and the second section is a concave end, and the size of the convex end of the first stepped guide rail 11 is smaller than the size of the convex end of the second stepped guide rail 12, in the initial state, the first limiting wheel 23 and the second limiting wheel 28 are located at the abutting positions of the convex ends of the first stepped guide rail 11 and the second stepped guide rail 12 respectively, so that the spacing between the first supporting rod 22 and the second supporting rod 27 and the rotating rod 6 is maximum, the second spring 24 and the third spring 29 are in the compressed state, so that 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 supporting rod 22, the movable contact 25 and the static contact 26 are in a separated state, under the action of the second supporting rod 27, the resistance value provided by the resistance regulator 31 in the circuit is in the minimum state through the adjustment of the adjusting plate 30.

[0061] If only the industrial equipment is started or stopped or the gear is switched, when the current flowing through the energized coil 4 increases, the magnetic force generated by the energized coil 4 and the iron core 3 increases, thereby driving the magnetic suction disc 9 to move away from the rotating disc 10, under the action of the limiting block 801 and the variable pitch helical groove 601, the rotating rod 6 rotates to drive the rotating disc 10 to rotate, the positions of the first stepped guide rail 11 and the second stepped guide rail 12 will change, when the convex end of the first stepped guide rail 11 is separated from the first limiting wheel 23, the convex end of the second stepped guide rail 12 is still in the abutting state with the second limiting wheel 28, at this time, the second spring 24 is elastically released, and drives the first limiting wheel 23 to move to the abutting position of the concave end of the first stepped guide rail 11 through the first supporting rod 22, at the same time, the first supporting rod 22 also drives the movable contact 25 to move towards the static contact 26, and abuts against the static contact 26, under the action of the movable contact 25 and the static contact 26, the alarm is controlled to work, and the equipment is not directly powered off, thereby avoiding misoperation.

[0062] If the current is still in the increasing state and has not exceeded the maximum load, the heat and the magnetic force generated by the current flow will increase, so that the expansion gas expands, under the action of the gas pushing force and the electromagnetic force, the magnetic suction disc 9 is continuously driven to move, the rotating disc 10 rotates to increase the rotating angle, so that the position of the second stepped guide rail 12 continues to change, when the convex end of the second stepped guide rail 12 is separated from the second limiting wheel 28, the third spring 29 is elastically released, and drives the second limiting wheel 28 to move to the abutting position of the concave end of the second stepped guide rail 12 through the second supporting rod 27, the second supporting rod 27 also drives the adjusting plate 30 to move, so as to increase the resistance value provided by the resistance regulator 31 in the circuit, under the action of the resistance regulator 31, the current is shunted to prevent the current from being too large to cause damage to the equipment.

[0063] 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 disc 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 abutting position with the protruding end, so that the moving contact 25 and the stationary contact 26 are separated, and the resistance value of the resistance regulator 31 is again at the minimum value.

[0064] Please refer to Figures 3-9 , the power-off limiting mechanism includes a first support plate 14 fixed on the receiving plate 2, the first support plate 14 is provided with a first conductive plate 13 connected with the power coil 4, the first support plate 14 is slidably installed with a movable rod 15, the movable rod 15 is provided with a second conductive plate 17 abutting with the first conductive plate 13; It also includes a guide assembly and a switch assembly provided on the movable rod 15 and connected with the rotating disc 10 for adjusting the abutting state of the second conductive plate 17 and the first conductive plate 13, the guide assembly includes a circular arc groove 1001 and a limiting hole 1002 formed on the rotating disc 10, the movable rod 15 is provided with a fixing ring 16 matched with the limiting hole 1002, the movable rod 15 is slidably embedded in the circular arc groove 1001, the switch assembly includes a first spring 18 sleeved on the movable rod 15, both ends of the first spring 18 abut with the second conductive plate 17 and the first support plate 14 respectively, the receiving plate 2 is rotatably installed with a power-on switch 20, the power-on switch 20 is formed with a clamping groove, the movable rod 15 is provided with a limiting column 19 slidably embedded in the clamping groove.

[0065] Further, in the initial state, the magnetic chuck 9 is located at the end of the stroke towards the rotating disc 10, so that the movable rod 15 penetrates the circular arc groove 1001 and is located at the end of the stroke away from the limiting hole 1002 on one side of the circular arc groove 1001, so that the fixing ring 16 abuts with the rotating disc 10, under the action of the fixing ring 16, the second conductive plate 17 and the first conductive plate 13 are in the state of abutting, so that the whole circuit is in the state of being turned on, at this time, the compression amount of the first spring 18 is maximum, the movable rod 15 will also control the angle between the limiting column 19 and the clamping groove to be maximum, so that the power-on switch 20 is in the position of being connected with electricity.

[0066] If the current fluctuation is small, the angle of the rotating disc 10 is small, under the action of the multi-stage response mechanism, the alarm and current limiting action can be performed, which can realize timely alarm and current limiting action when the inrush current occurs due to the start or gear shifting of the equipment, so as to ensure the normal operation of the equipment, and avoid frequent mis-tripping under the condition that the current does not appear continuous overload, which affects the continuity of production;

[0067] If the current is in a sustained overload or short circuit situation, the magnetic chuck 9 moves quickly under the action of magnetic force and expanding gas thrust, and through the quick response of the variable pitch spiral groove 601 and the limit block 801, the rotating rod 6 rotates quickly, thereby controlling the rotating disc 10 to rotate, the limit post 19 will slide in the circular arc groove 1001 relative to the rotating disc 10 and quickly approach the limit hole 1002, until the limit post 19 enters the limit hole 1002, at this time, the first spring 18 is elastically released and pushes the movable rod 15 quickly towards the direction away from the rotating disc 10 through the second conductive plate 17, so that the fixed ring 16 passes through the limit hole 1002, the second conductive plate 17 will be separated from the first conductive plate 13, so that the circuit is disconnected, at the same time, the movable rod 15 will also drive the limit post 19 to move, and under the action of the clamping groove, the power-on switch 20 moves to the power-off position.

[0068] Preferably, when the circuit is disconnected, the magnetic force of the magnetic chuck 9 disappears, the fourth spring 32 controls the magnetic chuck 9 to move towards the initial position, so that the rotating disc 10 rotates towards the initial angle, so that the limit hole 1002 is staggered with the fixed ring 16, under the action of the fixed ring 16, the movable rod 15 cannot be reset, so as to ensure that the second conductive plate 17 and the first conductive plate 13 are always in a separated state, so as to ensure that the power-on switch 20 cannot be directly pushed to the power-on position before the circuit inspection is completed, which can not only ensure the safety of the maintenance personnel, but also can prevent the problem of direct power-on leading to damage of internal parts of the power distribution cabinet due to misoperation.

[0069] A power distribution cabinet protection method of intelligent power grid monitoring combined action protection, comprising the following steps:

[0070] Step one: when the current flowing through the power-on coil 4 fluctuates slightly, the magnetic force generated by the iron core 3 and the power-on coil 4 is small, and the angle of the rotating disc 10 will not change;

[0071] Step two: when the current flowing through the power-on coil 4 fluctuates greatly, the magnetic force generated by the iron core 3 and the power-on coil 4 increases, and drives the electromagnetic control mechanism to move to control the rotating disc 10 to rotate;

[0072] Step three: when the rotating disc 10 rotates to a specific angle, the multi-stage response mechanism will execute the alarm and current limiting actions correspondingly;

[0073] Step four: when the current flowing through the power-on coil 4 exceeds the safety value, the rotating disc 10 will control the power-off limit mechanism to move to execute the power-off action.

[0074] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0075] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A power distribution cabinet with intelligent 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 provided on the receiving plate, an iron core is provided 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 disposed within the heat conducting tube, the electromagnetic control mechanism comprising a rotating disk, the receiving plate being provided with a multi-stage response mechanism cooperating with the rotating disk, the electromagnetic control mechanism being capable of driving the rotating disk to rotate when the current flowing through the energized coil changes, and controlling the multi-stage response mechanism to perform alarm and current limiting actions when the rotating disk rotates to a specific angle; A power-off limiting mechanism is provided on the receiving plate and cooperates with the rotating disk, and the rotating disk can control the power-off limiting mechanism to perform a power-off action when the current is overloaded; The electromagnetic control mechanism includes a rotating rod rotatably mounted in the heat conducting tube for driving the rotating disk to rotate. A guide column is provided in the heat conducting tube, and a limit ring is provided on the guide column. The electromagnetic control mechanism further includes a movable sleeve that slides axially along the rotating rod, the movable sleeve being 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, with two ends of the fourth spring abutting against the magnetic suction cup and the inner wall of the heat conducting pipe respectively; It also includes a pitch-variable spiral groove formed on the outer circumferential wall of the rotating rod, and a limit block is provided in the movable sleeve and is slidably engaged with the pitch-variable spiral groove; The multi-stage response mechanism includes a first step guide rail and a second step guide rail formed on the outer circumferential wall of the rotating disk, a second support plate symmetrically arranged is provided on the receiving plate, and an alarm component and a current limiting component for performing alarm and current limiting actions are provided on the second support plate; The alarm assembly includes a first support rod slidably mounted on the second support plate, the end of the first support rod is provided with a first limiting wheel that abuts against the first step guide rail, and a second spring is sleeved on the first support rod, and the two ends of the second spring abut against the second support plate and the first limiting wheel respectively; It also includes a static contact fixed on the second support plate, and the first support rod is provided with a dynamic contact that contacts and cooperates with the static contact; The current limiting assembly includes a second support rod slidably mounted on the second support plate, the end of the second support rod is provided with a second limiting wheel that abuts against the second step guide rail, and a third spring is sleeved on the second support rod, and the 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 to the resistance adjuster; The moving contact and the static contact can control the operation of the alarm. The first step guide rail and the second step guide rail can be divided into two sections, the first section is a protruding end, and the second section is a recessed end, and the protruding end size of the first step guide rail is smaller than the protruding end size of the second step guide rail. In the initial state, the first limiting wheel and the second limiting wheel are respectively located at the abutting position with the protruding ends of the first step guide rail and the second step guide rail, so that the distance between the first support rod and the second support rod and the rotating rod is the largest, and the second spring and the third spring are both in a compressed state, so that the first limiting wheel and the second limiting wheel have a tendency to move toward the direction of the rotating rod. Under the action of the first support rod, the moving contact and the static contact are in a separated state. Under the action of the second support rod, the resistance value provided by the resistance regulator in the circuit is controlled by the adjustment plate to be in the minimum state.

2. The intelligent power grid monitoring and combined action protection distribution cabinet according to claim 1 is characterized in that: The power-off limiting mechanism includes a first support plate fixed to the receiving plate, a first conductive plate connected to the energized coil is provided on the first support plate, a movable rod is slidably mounted on the first support plate, and a second conductive plate is provided on the movable rod to interfere with 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.

3. The intelligent power grid monitoring and combined action protection distribution cabinet according to claim 2 is characterized in that: 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. The movable rod is slidably engaged with the arc groove.

4. The intelligent power grid monitoring and combined action protection distribution cabinet according to claim 3 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 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.

5. A method for protecting a distribution cabinet with intelligent grid monitoring and combined action protection, using the distribution cabinet with intelligent grid monitoring and combined action protection according to any one of claims 1 to 4, 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 does 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, driving 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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