Intelligent power grid automatic power control switch cabinet and overload power control method thereof

Abstract

The invention relates to an intelligent power grid automatic power control switch cabinet and an overload power control method thereof. The intelligent power grid automatic power control switch cabinet comprises a cabinet body; the wiring board is provided with a static contact. A turntable is arranged on the wiring block; a knife switch is arranged in the cabinet body; a fuse is mounted on the knife switch; the other end of the fuse is provided with a movable contact; the knife switch is also provided with a separation structure which can drive the rotating disc to rotate. A sensing structure is arranged on the cabinet body; the induction structure comprises a heating resistor connected with the circuit; the turntable is connected with the sensing structure through a one-way driving structure; the induction structure can drive the rotating disc to rotate through the one-way driving structure so that the movable contact can abut against or be separated from the static contact. A signal transceiver is also arranged in the cabinet body; the state of the line can be monitored in real time through the sensing structure; as the sensing device monitors the load through resistor heating, the sensing numerical value error is small, the fluctuation is small, and the circuit is delayed to recover the access state again.

Description

Technical Field

[0001] The present invention relates to a switch cabinet for automatic power control of an intelligent power grid and an overload power control method thereof. Background Art

[0002] With the development of the intelligent power grid towards high density and a renewable energy penetration rate exceeding 30%, as a core node of the distribution network, the switch cabinet needs to simultaneously meet the requirements of dynamic load management, millisecond-level fault isolation, and digital monitoring of the entire life cycle of equipment. Traditional switch cabinets are difficult to support the new power system.

[0003] During the manufacturing process of the switch cabinet, the maximum load capacity will be set according to the usage environment, which can not only meet the usage requirements but also avoid resource waste. However, with the increase in the number of electrical equipment in the later stage, the load on the switch cabinet is also increasing; when the number of electrical equipment increases sharply at a certain time node, the actual load on the switch cabinet will exceed the maximum load capacity; when in an overload state for a long time, the lines on the switch cabinet will heat up; the components inside the switch cabinet will be damaged, greatly reducing the service life of the switch cabinet, and even dangerous situations (such as fires, electric leakage, etc.) may occur. Therefore, an overload power control device is often set inside the intelligent switch cabinet.

[0004] Common overload power control devices include sensors, control systems, opening and closing structures, and drivers. The sensors mostly use temperature sensors to monitor the temperature changes inside the switch cabinet in real time; an overload value (temperature value) is set on the control system. When the sensor senses that the load inside the switch cabinet exceeds the overload value (the temperature rises due to overload heating), it will send a signal to the control system; then the control system controls the driver to act to drive the opening and closing structure to perform the opening action to protect the switch cabinet; when the sensor senses that the temperature inside the switch cabinet drops, it will send real-time data, and through the control machine system, it controls the driver to act to drive the opening and closing structure to perform the closing action to restore power supply.

[0005] Normally, the overload power control device is reliable. However, since the overload value is mostly a specific value, and there are errors and fluctuations in the temperature sensed by the sensor, this may cause the overload power control device to perform frequent opening or closing actions of the opening and closing structure when the sensor senses that the real-time temperature is near the overload value (after the opening and closing structure performs the opening action, the sensed value suddenly fluctuates below the overload value, and at this time the control system will control the opening and closing structure to perform the closing action), greatly increasing the frictional loss between the contacts and posing an electricity consumption risk. Summary of the Invention

[0006] The purpose of the present invention is to provide a switch cabinet for automatic power control of an intelligent power grid and an overload power control method thereof to solve the problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solutions: A switch cabinet for automatic power control of an intelligent power grid, comprising a cabinet body; A plurality of groups of insulators are installed in the cabinet body; wiring boards and wiring blocks are respectively installed at both ends of the insulators; A static contact is installed on the wiring board; A fixed rod is installed on the wiring block; a turntable is rotatably installed on the fixed rod; a knife switch is arranged in the cabinet body; and the knife switch is connected to the turntable through a latching structure; A fuse is installed on the knife switch; the other end of the fuse is installed with a moving contact that is slidably fitted with the knife switch and cooperates with the static contact; A separating structure is further arranged on the knife switch, and the separating structure can drive the turntable to rotate so that the moving contact is separated from the static contact; An induction structure is arranged on the cabinet body; the induction structure includes a heating resistor connected to a circuit; the turntable is connected to the induction structure through a one-way driving structure; The induction structure can drive the turntable to rotate through the one-way driving structure according to the current change of the circuit in the cabinet body, so as to drive the moving contact to contact or separate from the static contact through the knife switch.

[0008] A signal transceiver is further arranged in the cabinet body to monitor the device state in real time and communicate with the control system.

[0009] As a further solution of the present invention: the latching structure includes a fitting groove opened on the turntable; a fitting block that can cooperate with the fitting groove is installed on the knife switch.

[0010] As a further solution of the present invention: the induction structure includes an expansion tank installed on the cabinet body; a piston is slidably fitted in the expansion tank; a push rod that is slidably fitted with the expansion tank is installed on the piston; a plurality of exhaust holes are opened at the upper end of the expansion tank.

[0011] As a further solution of the present invention: the one-way driving structure includes a first connecting rod fixedly connected to the push rod; a first sliding groove is opened on the first connecting rod; a slider is slidably installed in the first sliding groove; a telescopic rod that is slidably fitted with the first connecting rod is installed on the slider; a buffer spring is arranged in the first connecting rod; both ends of the buffer spring respectively abut against the telescopic rod and the first connecting rod.

[0012] As a further solution of the present invention: The unidirectional driving structure further includes a second connecting rod rotatably mounted on the fixed rod; a second fixing column is mounted on the second connecting rod; a first fixing column is mounted on the wiring block; a tension spring is arranged on the second connecting rod; both ends of the tension spring are respectively connected to the first fixing column and the second fixing column; an arc-shaped chute is formed on the turntable; a protruding column slidably engaged with the arc-shaped chute is mounted on the second connecting rod; a second chute slidably engaged with the slider is formed on the second connecting rod.

[0013] As a further solution of the present invention: The separating structure includes a baffle mounted in the knife switch; a connecting block fixedly connected to the moving contact is slidably engaged in the knife switch; a separating spring is arranged in the knife switch; both ends of the separating spring respectively abut against the connecting block and the baffle.

[0014] As a further solution of the present invention: The elastic force direction of the separating spring is consistent with the tangential direction of the turntable.

[0015] As a further solution of the present invention: The elastic force of the tension spring is greater than that of the buffer spring; and less than that of the separating spring.

[0016] As a further solution of the present invention: A snap ring is mounted on the knife switch.

[0017] A power control method for a switch cabinet of an intelligent power grid automatic power control as described above when overloaded, includes the following steps; Step 1: Use an insulating rod to connect the knife switch and the turntable through a lapping structure; and push the knife switch to drive the turntable to rotate, so that the moving contact abuts against the static contact; and drive the induction structure and the unidirectional driving structure to act in a working state. Step 2: When the load is too large and the switch cabinet is overloaded: The induction structure will drive the turntable to rotate through the unidirectional driving structure, so as to drive the moving contact and the static contact to separate through the knife switch; when the load returns to normal, the induction structure will drive the moving contact and the static contact to abut again to restore power supply. Step 3: When a short circuit causes the switch cabinet to be overloaded: The separating structure drives the turntable to rotate, so as to drive the moving contact and the static contact to separate through the knife switch, and keep the working state of the induction structure. Step 4: The signal transceiver monitors the state of the switch cabinet in real time and communicates with the control system.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The state of the circuit can be monitored in real time through the induction structure; Since the induction device monitors the load by heating the resistor, the induction value error is small and the fluctuation is small; And through the mutual cooperation with the unidirectional drive structure, the on and off states of the circuit can be controlled according to the monitoring results. Moreover, the restoration of the circuit to the on state has hysteresis (that is, the induction structure and the unidirectional drive structure do not drive the turntable to move during the process of the temperature of the heating resistor decreasing to the warning value, and can drive the turntable to move only after the temperature drops below the warning value), which can avoid frequent on and off operations when the temperature of the heating resistor is near the dangerous value, thereby improving the service life of the switch cabinet and the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of an embodiment of a switch cabinet for automatic power control in a smart grid and its overload power control method.

[0020] Figure 2 Schematic diagram of the structure of the knife switch in an embodiment of a switch cabinet for automatic power control in a smart grid and its overload power control method.

[0021] Figure 3 Schematic diagram of the structure of the wiring board and the wiring block in an embodiment of a switch cabinet for automatic power control in a smart grid and its overload power control method.

[0022] Figure 4 For Figure 3 The schematic diagram of the structure at position A in

[0023] Figure 5 For Figure 3 The schematic diagram of the structure from the sectional view of

[0024] Figure 6 For Figure 5 The schematic diagram of the structure at position B in

[0025] Figure 7 Schematic diagram of the structure of the fitting groove and the fitting block in an embodiment of a switch cabinet for automatic power control in a smart grid and its overload power control method.

[0026] Figure 8 Schematic diagram of the structure of the tension spring in an embodiment of a switch cabinet for automatic power control in a smart grid and its overload power control method.

[0027] Figure 9 Schematic diagram of the structure of the expansion tank body in an embodiment of a switch cabinet for automatic power control in a smart grid and its overload power control method.

[0028] Figure 10 Schematic diagram of the structure of the moving contact in an embodiment of a switch cabinet for automatic power control in a smart grid and its overload power control method.

[0029] Figure 11 is Figure 10 a schematic diagram of the structure at position C in

[0030] In the figure: 1. Cabinet body; 2. Signal transceiver; 3. Insulator; 4. Terminal block; 401. Fixed contact; 5. Wiring block; 501. First fixing post 6. Fixed rod; 7. Turntable; 701. Fitting groove; 702. Arc-shaped sliding groove; 8. Fitting block; 9. Knife switch; 901. Snap ring; 902. Baffle; 10. Moving contact; 11. Expansion tank body; 1101. Exhaust hole; 12. Heating resistor; 13. Piston; 14. Thumb rod; 15. First connecting rod; 1501. First sliding groove; 16. Slide block; 1601. Telescopic rod; 17. Buffer spring; 18. Second connecting rod; 1801. Second sliding groove; 1802. Protruding column; 1803. Second fixing post; 19. Tension spring; 20. Connecting block; 21. Separation spring; 22. Fuse. Specific embodiments

[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, the elements in the present invention are referred to as "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 manner.

[0033] Please refer to Figures 1 to 11, in the embodiment of the present invention, a switch cabinet for automatic power control of an intelligent power grid includes a cabinet body 1; A plurality of groups of insulators 3 are installed in the cabinet body 1; a wiring board 4 and a wiring block 5 are respectively installed at both ends of the insulator 3; A static contact 401 is installed on the wiring board 4; A fixing rod 6 is installed on the wiring block 5; a turntable 7 is rotatably installed on the fixing rod 6; a knife switch 9 is arranged in the cabinet body 1; and the knife switch 9 is connected to the turntable 7 through a lapping structure; A fuse 22 is installed on the knife switch 9; a moving contact 10 which is slidably fitted with the knife switch 9 and cooperates with the static contact 401 is installed at the other end of the fuse 22; A separating structure is further arranged on the knife switch 9, and the separating structure can drive the turntable 7 to rotate so as to separate the moving contact 10 from the static contact 401; An induction structure is arranged on the cabinet body 1; the induction structure includes a heating resistor 12 connected to a circuit; the turntable 7 is connected to the induction structure through a one-way driving structure; The induction structure can drive the turntable 7 to rotate through the one-way driving structure according to the current change of the circuit in the cabinet body 1, so as to drive the moving contact 10 to contact or separate from the static contact 401 through the knife switch 9.

[0034] A signal transceiver 2 is further arranged in the cabinet body 1 to monitor the state of the switch cabinet in real time and communicate with a control system.

[0035] Taking the embodiment combined with all the features described in this application as an example, when in use, the incoming line end of the external power grid is connected to the wiring board 4, and the wiring block 5 is connected to the components in the switch cabinet; after the moving contact 10 contacts the static contact 401, the current flows from the wiring board 4 to the fuse 22 and finally to the wiring block 5, so that the circuit is in a conducting state.

[0036] The signal transceiver 2 monitors the state of the switch cabinet in real time and communicates with the control system.

[0037] After the switch cabinet is installed and detected, an insulating rod is used to connect the knife switch 9 to the turntable 7 through the lapping structure. The lapping structure can prevent the knife switch 9 from separating from the turntable 7 due to external interference such as vibration, resulting in circuit disconnection, and can reduce the installation difficulty and risk, providing convenience for maintenance and repair.

[0038] Then, an insulating rod is used to push the knife switch 9 to drive the moving contact 10 to approach and contact the static contact 401, and at the same time drive the turntable 7 to rotate, so that the one-way driving structure and the induction structure are in a working state.

[0039] The static contact 401 is an elastic conductor, and a groove for clamping with the moving contact 10 is provided thereon; during the process of the moving contact 10 approaching the static contact 401, the static contact 401 will be first squeezed to deform under force, so that it can smoothly enter the groove, and after the moving contact 10 enters the groove, the restoring elastic force of the static contact 401 will make the static contact 401 closely contact with the moving contact 10, so as to avoid potential electrical hazards such as poor contact.

[0040] When the electrical load on the line connected to the switch cabinet is too large (it can be known from Ohm's law that the larger the load, the larger the current), the induction component on the induction structure is connected to the line, so as to sense the current change on the line (the higher the current, the higher the temperature of the heating resistor 12); when the load exceeds the rated load of the switch cabinet (the temperature of the heating resistor 12 reaches the warning value), the induction structure triggers the one-way drive structure to act, but at this time the one-way drive structure only pushes the turntable 7 to rotate slightly, without completely separating the moving contact 10 from the static contact 401; and when the load exceeds the maximum load of the switch cabinet (the temperature of the heating resistor 12 exceeds the dangerous value), the turntable 7 will drive the knife switch 9 to rotate, so as to drive the moving contact 10 and the static contact 401 to be instantly separated, so that the line is in an open circuit state.

[0041] The signal transceiver 2 will upload the data of this process to the control system to remind the user to reduce the number of electrical equipment.

[0042] When the line is in an open circuit state, the temperature of the heating resistor 12 will gradually decrease. As the temperature of the heating resistor 12 decreases, the induction structure and the one-way drive structure will gradually reset; when the temperature of the heating resistor 12 decreases from the dangerous value to the warning value, the turntable 7 does not rotate; and when the temperature of the heating resistor 12 decreases below the warning value, the reset actions of the induction structure and the one-way structure will drive the turntable 7 to rotate slowly, so as to drive the knife switch 9 to rotate, so that the moving contact 10 slowly contacts with the static contact 401, so as to restore the conduction state of the line again.

[0043] The state of the line can be monitored in real time through the induction structure; and through the mutual cooperation with the one-way drive structure, the on and off states of the line can be controlled according to the monitoring results. And the line's restoration of the conduction state has hysteresis (that is, the induction structure and the one-way drive structure do not drive the turntable 7 to act when the temperature of the heating resistor 12 decreases to the warning value, and can drive the turntable 7 to act only after the temperature decreases below the warning value), which can avoid frequent on and off actions when the temperature of the heating resistor 12 is near the dangerous value, so as to improve the service life of the switch cabinet and the line.

[0044] When a short circuit occurs in the line, the switch cabinet will also be in an overload state. At the moment of short circuit, the fuse 22 will be melted, thereby causing the separation structure to operate. The separation structure drives the turntable 7 to rotate, so as to drive the moving contact 10 and the static contact 401 to separate instantly, thereby reducing the loss between the moving contact 10 and the static contact 401. The moving contact 10 and the static contact 401 that are obviously in a separated state can facilitate maintenance personnel to identify the short circuit circuit and improve maintenance efficiency.

[0045] Furthermore, due to the setting of the one-way driving structure, when the separation structure drives the turntable 7 to rotate, the separation speed of the moving contact 10 and the stationary contact 401 will not be reduced due to the resistance of the induction structure, thereby improving the corresponding efficiency after the fuse 22 is blown and avoiding the expansion of losses.

[0046] In another embodiment of the present invention, the overlapping structure includes an engaging groove 701 provided on the rotating disk 7 ; and an engaging block 8 which can cooperate with the engaging groove 701 is installed on the knife 9 .

[0047] Taking the embodiment combining all the features recorded in this application as an example, when in use, the knife switch 9 is driven close to the turntable 7 by the insulating rod, and the engaging block 8 is embedded in the engaging groove 701; then the groove wall of the engaging groove 701 will interfere with the engaging block 8, thereby realizing a stable connection between the knife switch 9 and the turntable 7.

[0048] The overlapping structure can prevent external interference such as vibration from separating the switch 9 from the turntable 7 and causing the line to be disconnected, and can reduce the difficulty and risk of installation, providing convenience for repair and maintenance.

[0049] In another embodiment of the present invention, the sensing structure includes an expansion tank body 11 installed on the cabinet body 1; a piston 13 is slidably engaged in the expansion tank body 11; a push rod 14 is installed on the piston 13 and is slidably engaged with the expansion tank body 11; and a plurality of exhaust holes 1101 are provided at the upper end of the expansion tank body 11.

[0050] Taking the embodiment combining all the features described in the present application as an example, when in use, the greater the current in the circuit, the higher the temperature of the heating resistor 12 , and the expansion tank 11 contains a medium that expands due to heat.

[0051] When the line current increases, the temperature of the heating resistor 12 also increases, so that the medium gradually expands, thereby pushing the piston 13 to gradually move away from the heating resistor 12, and driving the push rod 14 to move synchronously. The exhaust hole 1101 can reduce the resistance of the piston 13 to move, and prevent the medium from being blocked by thermal expansion.

[0052] During the process of the temperature of the heating resistor 12 rising to the warning value, the ejector rod 14 will drive the one-way drive structure to act, but cannot drive the turntable 7 to rotate, so as to avoid potential electrical hazards such as poor contact at the contact point caused by frequent friction between the moving contact 10 and the static contact 401.

[0053] When the temperature of the heating resistor 12 exceeds the dangerous value, the one-way drive structure will drive the turntable 7 to rotate, and drive the moving contact 10 and the static contact 401 to quickly separate, so that the circuit is in an open state.

[0054] After the circuit is opened, the temperature of the heating resistor 12 gradually decreases, and the medium will gradually reset and contract, thereby driving the piston 13 to move towards the heating resistor 12.

[0055] The induction structure can monitor the state of the circuit in real time; and through the mutual cooperation with the one-way drive structure, it can control the on and off states of the circuit according to the monitoring results. And the circuit restoring the on state has hysteresis (that is, the induction structure and the one-way drive structure do not drive the turntable 7 to act during the process of the temperature of the heating resistor 12 decreasing to the warning value, and can drive the turntable 7 to act only after the temperature decreases below the warning value), which can avoid frequent on and off operations when the temperature of the heating resistor 12 is near the dangerous value, so as to improve the service life of the switch cabinet and the circuit.

[0056] In another embodiment of the present invention, the one-way drive structure includes a first connecting rod 15 fixedly connected to the ejector rod 14; a first sliding groove 1501 is formed in the first connecting rod 15; a slider 16 is slidably installed in the first sliding groove 1501; a telescopic rod 1601 slidably engaged with the first connecting rod 15 is installed on the slider 16; a buffer spring 17 is arranged in the first connecting rod 15; both ends of the buffer spring 17 abut against the telescopic rod 1601 and the first connecting rod 15 respectively.

[0057] In another embodiment of the present invention, the one-way drive structure further includes a second connecting rod 18 rotatably installed on the fixed rod 6; a second fixing column 1803 is installed on the second connecting rod 18; a first fixing column 501 is installed on the wiring block 5; a tension spring 19 is arranged on the second connecting rod 18; both ends of the tension spring 19 are connected to the first fixing column 501 and the second fixing column 1803 respectively; an arc-shaped sliding groove 702 is formed in the turntable 7; a protruding column 1802 slidably engaged with the arc-shaped sliding groove 702 is installed on the second connecting rod 18; a second sliding groove 1801 slidably engaged with the slider 16 is formed in the second connecting rod 18.

[0058] Taking the embodiment combining all the features recorded in the present application as an example, when in use, when the second fixed column 1803 is located on the extension line of the line connecting the first fixed column 501 and the fixed rod 6, the second connecting rod 18 is in a force balance state (the fixed rod 6 is located in the tension direction of the tension spring 19); in the absence of external interference, the position of the second connecting rod 18 will remain unchanged.

[0059] After the moving contact 10 and the stationary contact 401 are in close contact, the second connecting rod 18 is in a non-force-balanced state, and the elastic force of the tension spring 19 makes the second connecting rod 18 tend to rotate toward the push rod 14. The slider 16 is located at the lower end of the first slide groove 1501 and at the end of the second slide groove 1801 away from the second fixed column 1803; the protruding column 1802 is located at one end of the arc-shaped slide groove 702.

[0060] The process of the temperature of the heating resistor 12 rising to the warning value: When the top rod 14 moves away from the heating resistor 12, it will drive the first connecting rod 15 to move synchronously to compress the buffer spring 17, and then drive the slider 16 to move under the elastic force of the buffer spring 17. The slider 16 drives the second connecting rod 18 to rotate away from the top rod 14, and the slider 16 slides to the other end in the second slide slot 1801.

[0061] When the second connecting rod 18 rotates, the protruding column 1802 will be driven to rotate synchronously, so that the protruding column 1802 slides to the other end in the arc-shaped sliding groove 702.

[0062] The expansion and contraction amount of the tension spring 19 will gradually increase, that is, the elastic force will gradually increase. During this process, the second connecting rod 18 is still in a non-force-balanced state.

[0063] The temperature of the heating resistor 12 reaches the warning value: The protruding column 1802 slides until it contacts the other end of the arc-shaped sliding groove 702 .

[0064] The temperature of heating resistor 12 is between the warning value and the dangerous value: The top rod 14 continues to rise, thereby causing the second connecting rod 18 to rotate, and driving the turntable 7 to rotate, thereby driving the switch 9 to rotate; and because the speed and angle of rotation of the second connecting rod 18 are relatively small, under the action of the elastic force of the static contact 401, the moving contact 10 and the static contact 401 are still in close contact.

[0065] Heating resistor 12 temperature danger value: The second connecting rod 18 rotates to a balanced state.

[0066] The temperature of heating resistor 12 exceeds the dangerous value: The ejector rod 14 continues to drive the second connecting rod 18 to rotate, thereby breaking the balance state of the second connecting rod 18. The elastic force of the tension spring 19 will drive the second connecting rod 18 to quickly rotate away from the ejector rod 14, thereby driving the turntable 7 to rotate synchronously, and thus driving the moving contact 10 to quickly separate from the static contact 401. At this time, the slider 16 will slide in the second chute 1801 and slide upward in the first chute 1501, thereby driving the telescopic rod 1601 to slide outward on the first connecting rod 15, reducing the compression amount of the buffer spring 17.

[0067] The temperature of the heating resistor 12 drops to a dangerous value: The piston 13 drives the ejector rod 14 to approach the heating resistor 12 synchronously, thereby driving the first connecting rod 15 to move downward, and thus driving the second connecting rod 18 to rotate towards the ejector rod 14 through the slider 16, so that the protruding column 1802 slides reversely in the arc chute 702 until it abuts against one end of the arc chute 702; and the slider 16 slides in the second chute 1801 away from the second fixed column 1803; during this process, the turntable 7 does not rotate, and the second connecting rod 18 is in an unbalanced state (with a tendency to rotate away from the ejector rod 14).

[0068] The temperature of the heating resistor 12 drops from the dangerous value to the warning value: The first connecting rod 15 drives the second connecting rod 18 to rotate to the balanced position, and the turntable 7 rotates, so that the knife switch 9 rotates towards the wiring board 4 and approaches it.

[0069] The temperature of the heating resistor 12 drops below the warning value. The first connecting rod 15 drives the second connecting rod 18 to rotate, thereby breaking the balance state of the second connecting rod 18. Under the action of the elastic force of the tension spring 19, the second connecting rod 18 rotates towards the ejector rod 14, thereby driving the knife switch 9 to rotate towards the wiring board 4.

[0070] During this process, the second connecting rod 18 will drive the slider 16 to slide downward in the first chute 1501, thereby driving the telescopic rod 1601 to slide inward in the first connecting rod 15, compressing the buffer spring 17. The elastic force of the buffer spring 17 is used to offset the sliding speed of the slider 16, and the speed of the moving contact 10 abutting against the static contact 401 can be reduced.

[0071] After the moving contact 10 abuts against the static contact 401, then the piston 13 continues to move (until the temperature of the heating resistor 12 drops to the initial value); during this process, the first connecting rod 15 will continue to move, while the second connecting rod 18 remains in place under the action of the elastic force of the buffer spring 17, and the compression amount of the buffer spring 17 gradually decreases.

[0072] The state of the circuit can be monitored in real time through the sensing structure; and through the mutual cooperation with the unidirectional driving structure, the energization and de - energization states of the circuit can be controlled according to the monitoring results. Moreover, the restoration of the circuit to the conducting state has hysteresis (that is, the sensing structure and the unidirectional driving structure do not drive the turntable 7 to act during the process of the temperature of the heating resistor 12 decreasing to the warning value, and can drive the turntable 7 to act only after the temperature drops below the warning value), which can avoid frequent execution of energization and de - energization actions when the temperature of the heating resistor 12 is near the dangerous value, thereby improving the service life of the switch cabinet and the circuit.

[0073] In another embodiment of the present invention, the separation structure includes a baffle 902 installed in the knife - blade 9; a connecting block 20 fixedly connected to the moving contact 10 is slidably fitted in the knife - blade 9; a separation spring 21 is arranged in the knife - blade 9; and two ends of the separation spring 21 respectively abut against the connecting block 20 and the baffle 902.

[0074] Taking the embodiment combined with all the features described in this application as an example, when a short - circuit occurs in the circuit during use, the fuse 22 will instantly blow to disconnect the circuit.

[0075] In the initial state, the separation spring 21 is in a compressed state. Under the action of the elastic force of the separation spring 21, the fuse 22 is in a straightened state, and the position of the moving contact 10 is kept unchanged through the fuse 22.

[0076] When the pulling force of the fuse 22 disappears, the elastic force of the separation spring 21 will drive the moving connecting block 20 to move away from the baffle 902, thereby driving the moving contact 10 to squeeze the static contact 401.

[0077] The force of the moving contact 10 squeezing the static contact 401 will act on the turntable 7, thereby driving the turntable 7 to rotate, and then driving the knife - blade 9 and the second connecting rod 18 to rotate.

[0078] When the second connecting rod 18 rotates past the equilibrium position, the elastic force of the tension spring 19 will drive the protruding column 1802 to slide to the other end point in the arc - shaped chute 702, and then drive the turntable 7 to rotate, thereby driving the knife - blade 9 to rotate to drive the moving contact 10 and the static contact 401 to quickly separate.

[0079] During the whole process, the slider 16 slides in the first chute 1501 and the first connecting rod 15 moves.

[0080] And due to the setting of the unidirectional driving structure, when the separation structure drives the turntable 7 to rotate, the separation speed of the moving contact 10 and the static contact 401 will not be reduced due to the resistance of the sensing structure, thereby improving the response efficiency after the fuse 22 blows and avoiding the expansion of losses.

[0081] In another embodiment of the present invention, the elastic force direction of the separation spring 21 is consistent with the tangential direction of the turntable 7.

[0082] Taking the embodiment combining all the features described in this application as an example, when in use, the elastic force direction of the separation spring 21 is tangent to the turntable 7, reducing the resistance of the elastic force to drive the rotation of the turntable 7, ensuring that the turntable 7 can rotate, and avoiding the situation where the moving contact 10 and the static contact 401 cannot be separated, thus preventing the expansion of losses.

[0083] In another embodiment of the present invention, the elastic force of the tension spring 19 is greater than that of the buffer spring 17; and less than that of the separation spring 21.

[0084] Taking the embodiment combining all the features described in this application as an example, when in use, the elastic force of the separation spring 21 is greater than that of the tension spring 19, enabling the separation structure to drive the rotation of the turntable 7.

[0085] The elastic force of the tension spring 19 being greater than that of the buffer spring 17 can ensure that the elastic force of the buffer spring 17 does not affect the stable contact between the moving contact 10 and the static contact 401.

[0086] In another embodiment of the present invention, a snap ring 901 is installed on the knife switch 9.

[0087] Taking the embodiment combining all the features described in this application as an example, when in use, the snap ring 901 can reduce the difficulty of installing the knife switch 9, improving the installation efficiency and safety.

[0088] A power control method for a switch cabinet with automatic power control in an intelligent power grid when overloaded, as described above, includes the following steps; Step 1: Use an insulating rod to connect the knife switch 9 and the turntable 7 through a lapping structure; and push the knife switch 9 to drive the rotation of the turntable 7, so that the moving contact 10 contacts the static contact 401; and drive the induction structure and the one-way drive structure to be in an operating state. Step 2: When the load is too large and the switch cabinet is overloaded: the induction structure will drive the rotation of the turntable 7 through the one-way drive structure, thereby driving the separation of the moving contact 10 and the static contact 401 through the knife switch 9; when the load returns to normal, the induction structure will drive the moving contact 10 and the static contact 401 to contact again to resume power supply. Step 3: When a short circuit causes the switch cabinet to be overloaded: the separation structure drives the rotation of the turntable 7 to drive the separation of the moving contact 10 and the static contact 401 through the knife switch 9, and maintains the operating state of the induction structure. Step 4: The signal transceiver 2 monitors the state of the switch cabinet in real time and communicates with the control system.

[0089] 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 basic characteristics of the present invention. Therefore, in any regard, 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.

[0090] In addition, it should be understood that although this specification is described according to 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 switch cabinet for automatic power control of a smart grid, comprising a cabinet body (1); It is characterized in that A plurality of groups of insulators (3) are installed in the cabinet (1); a terminal board (4) and a terminal block (5) are installed at both ends of the insulator (3); A stationary contact (401) is installed on the wiring board (4); A fixing rod (6) is mounted on the junction block (5); a turntable (7) is rotatably mounted on the fixing rod (6); a knife switch (9) is arranged in the cabinet (1); and the knife switch (9) and the turntable (7) are connected via an overlap structure; A fuse (22) is mounted on the knife switch (9); a movable contact (10) is mounted on the other end of the fuse (22) and is slidably engaged with the knife switch (9) and cooperates with the stationary contact (401); The knife switch (9) is also provided with a separation structure, and the separation structure can drive the rotating disk (7) to rotate so as to separate the moving contact (10) from the stationary contact (401); The cabinet (1) is provided with an induction structure; the induction structure comprises a heating resistor (12) connected to a circuit; the turntable (7) is connected to the induction structure via a one-way driving structure; The sensing structure can drive the rotating disk (7) to rotate through a unidirectional driving structure according to the current change of the circuit in the cabinet (1), so as to drive the moving contact (10) to contact or separate from the stationary contact (401) through the knife switch (9); A signal transceiver (2) is also provided in the cabinet (1) to monitor the status of the device in real time and communicate with the control system.

2. A switch cabinet for automatic power control of a smart grid according to claim 1, characterized in that: The overlapping structure comprises an engaging groove (701) provided on the rotating disk (7); and an engaging block (8) which can cooperate with the engaging groove (701) is installed on the knife (9).

3. The switch cabinet for automatic power control of a smart grid according to claim 1, characterized in that: The sensing structure comprises an expansion tank body (11) mounted on the cabinet body (1); a piston (13) is slidably engaged in the expansion tank body (11); a push rod (14) is mounted on the piston (13) and is slidably engaged with the expansion tank body (11); and a plurality of exhaust holes (1101) are provided at the upper end of the expansion tank body (11).

4. A switch cabinet for automatic power control of a smart grid according to claim 3, characterized in that: The one-way driving structure comprises a first connecting rod (15) fixedly connected to the push rod (14); a first sliding groove (1501) is provided on the first connecting rod (15); a sliding block (16) is slidably installed in the first sliding groove (1501); a telescopic rod (1601) slidably engaged with the first connecting rod (15) is installed on the sliding block (16); a buffer spring (17) is provided in the first connecting rod (15); two ends of the buffer spring (17) respectively contact the telescopic rod (1601) and the first connecting rod (15).

5. A switch cabinet for automatic power control of a smart grid according to claim 4, characterized in that: The one-way drive structure further comprises a second connecting rod (18) rotatably mounted on the fixed rod (6); a second fixing column (1803) is mounted on the second connecting rod (18); a first fixing column (501) is mounted on the terminal block (5); a tension spring (19) is arranged on the second connecting rod (18); two ends of the tension spring (19) are respectively connected to the first fixing column (501) and the second fixing column (1803); an arc-shaped sliding groove (702) is provided on the rotating disk (7); a protruding column (1802) slidably engaged with the arc-shaped sliding groove (702) is mounted on the second connecting rod (18); and a second sliding groove (1801) slidably engaged with the sliding block (16) is provided on the second connecting rod (18).

6. A switch cabinet for automatic power control of a smart grid according to claim 5, characterized in that: The separation structure comprises a baffle (902) installed in the knife gate (9); a connection block (20) fixedly connected to the moving contact (10) is slidably engaged in the knife gate (9); a separation spring (21) is arranged in the knife gate (9); and two ends of the separation spring (21) respectively contact the connection block (20) and the baffle (902).

7. A switch cabinet for automatic power control of a smart grid according to claim 6, characterized in that: The elastic force direction of the separation spring (21) is consistent with the tangent direction of the rotating disk (7).

8. The switch cabinet for automatic power control of a smart grid according to claim 7, characterized in that: The elastic force of the tension spring (19) is greater than the elastic force of the buffer spring (17), and less than the elastic force of the separation spring (21).

9. The switch cabinet for automatic power control of a smart grid according to claim 1, characterized in that: A snap ring (901) is mounted on the knife gate (9).

10. A method for controlling power when a switch cabinet for automatic power control of a smart grid is overloaded as claimed in any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1: Use an insulating rod to connect the knife switch (9) and the rotating disk (7) through the overlapping structure; and push the knife switch (9), thereby driving the rotating disk (7) to rotate, so that the moving contact (10) and the stationary contact (401) are in conflict; and drive the induction structure and the one-way driving structure to a working state; Step 2: When the load is too large and causes the switch cabinet to be overloaded: the induction structure drives the rotary disk (7) to rotate through the one-way drive structure, thereby driving the moving contact (10) and the stationary contact (401) to separate through the knife switch (9); when the load returns to normal, the induction structure drives the moving contact (10) and the stationary contact (401) to contact each other again, so as to restore power supply; Step 3: When the switch cabinet is overloaded due to a short circuit: the separation structure drives the rotary disk (7) to rotate, so as to drive the moving contact (10) to separate from the static contact (401) through the knife switch (9), and maintain the working state of the induction structure; Step 4: The signal transceiver (2) monitors the switch cabinet status in real time and communicates with the control system.

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