Open-circuit arc-extinguishing high-voltage switch cabinet for intelligent load monitoring of power grid and protection method thereof

Abstract

The invention relates to the technical field of power-off protection, in particular to a power grid intelligent load monitoring circuit break arc extinguishing high-voltage switch cabinet and a protection method thereof.The power grid intelligent load monitoring circuit break arc extinguishing high-voltage switch cabinet comprises a cabinet body and a support arranged in the cabinet body, the support is provided with a supporting plate, a fixing plate and an adjustable resistor, and the supporting plate is provided with an arc extinguishing resistor; the rotating rod is rotationally installed on the supporting plate, and an electromagnetic adsorption mechanism is arranged on the supporting plate and used for controlling the rotating rod to rotate and adjusting the resistance value of the adjustable resistor; the follow-up assembly is arranged on the rotating rod, and a lifting switching mechanism is arranged on the follow-up assembly; and the trigger power-off mechanism is arranged on the fixed plate and used for executing a power-off action when the circuit exceeds a rated threshold value, and an adjustable resistor or an arc extinguishing resistor can be automatically controlled to work according to the current change in the circuit through the cooperation of a follow-up assembly and the lifting switching mechanism, so that the effects of suppressing current fluctuation and performing arc extinguishing protection on the circuit are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power failure protection, in particular to a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads of a power grid and a protection method thereof. Background Art

[0002] High-voltage switchgear is a key equipment in power systems used to distribute, control, protect and monitor electric energy. It is mainly used in substations, industrial and mining enterprises, power plants and other places, and is responsible for connecting, disconnecting and protecting high-voltage circuits.

[0003] In power systems, load power-off protection is a key measure to ensure equipment safety and prevent fault expansion, while load current interruption and arc extinguishing is the core technology to ensure safe circuit disconnection. Especially when cutting off high current or fault current, the high temperature and energy of the arc may damage equipment or even cause accidents.

[0004] Therefore, during the circuit breaking process, gas arc extinguishing or arc extinguishing grids are usually used to extinguish the generated arc. However, during the operation of the circuit, its current is easily affected by the start and stop of power equipment, resulting in dynamic current fluctuations, which may cause frequent false tripping and lead to frequent circuit breaking and arc generation.

[0005] To this end, resistors can be set to suppress current fluctuations. By connecting resistors in parallel to shunt the current, current fluctuations can be dynamically suppressed, thereby avoiding the problem of false tripping. However, in order to avoid interference with the circuit, the resistance value of the set resistor is usually small. If the circuit is short-circuited or overloaded, the resistor will be subjected to high-voltage shocks. During the circuit-breaking process, the resistor cannot extinguish the arc, and it is easy for the resistor to burn out, which in turn leads to the failure of the protection effect. Summary of the Invention

[0006] The object of the present invention is to provide a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid and a protection method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: A circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid, comprising: A cabinet body, and a bracket arranged in the cabinet body, wherein the bracket is provided with a support plate, a fixing plate and an adjustable resistor, and the support plate is provided with an arc-extinguishing resistor; Also includes: A rotating rod is rotatably mounted on the support plate, and an electromagnetic adsorption mechanism is provided on the support plate for controlling the rotation of the rotating rod and adjusting the resistance value of the adjustable resistor; A follower assembly is provided on the rotating rod, and a lifting switching mechanism is provided on the follower assembly, and the follower assembly can control the power-on state of the adjustable resistor and the arc-extinguishing resistor through the lifting switching mechanism; The power-off mechanism is triggered and arranged on the fixing plate, and is used for performing a power-off action when the circuit exceeds a rated threshold.

[0008] As a further embodiment of the present invention, the electromagnetic adsorption mechanism includes a first guide groove formed on the outer circumferential wall of the rotating rod, a sliding sleeve is provided for axial sliding of the rotating rod, a first limit block is provided on the inner wall of the sliding sleeve and is slidably engaged with the guide groove, and a first spring is sleeved on the rotating rod, with two ends of the first spring respectively abutting against the sliding sleeve and the support plate; It also includes a guide column arranged on the support plate, the axial sliding of the guide column has a first guide plate fixedly connected to the sliding sleeve, a limit plate is arranged on the first guide plate, and an electric component is arranged on the support plate.

[0009] As a further solution of the present invention: the power-carrying component includes an iron core arranged on the support plate, and a coil is wound around the iron core.

[0010] As a further solution of the present invention, the follower assembly includes a second guide groove formed on the outer circumferential wall of the rotating rod, a movable sleeve is provided for axial sliding of the rotating rod, and a second limit block is provided on the inner wall of the movable sleeve for sliding engagement with the second guide groove; It also includes a second guide plate that slides axially along the guide column and is fixedly connected to the movable sleeve. A connecting plate is provided on the guide column. A second spring is sleeved on the rotating rod. The two ends of the second spring are respectively in contact with the second guide plate and the support plate.

[0011] As a further solution of the present invention: the lifting switching mechanism includes a first static contact arranged on the support plate, a first connecting rod electrically connected to the adjustable resistor is slidably installed on the second guide plate, a first moving contact and a first fixed ring are provided on the first connecting rod, the first moving contact cooperates with the first static contact, the first fixed ring is in contact with the second guide plate, a third spring is sleeved on the first connecting rod, and the two ends of the third spring are respectively in contact with the first moving contact and the second guide plate.

[0012] As a further solution of the present invention: the lifting and switching mechanism also includes a second static contact arranged on the connecting plate, a second connecting rod electrically connected to the arc extinguishing resistor is slidably installed on the second guide plate, a second connecting rod is provided with a second moving contact and a second fixed ring, the second moving contact cooperates with the second static contact, the second fixed ring is in contact with the second guide plate, a fourth spring is sleeved on the second connecting rod, and the two ends of the fourth spring are respectively in contact with the second moving contact and the second guide plate.

[0013] As a further solution of the present invention: the trigger power-off mechanism includes a support column arranged on the fixed plate, the support column is provided with a support sleeve for axial sliding, a fifth spring is sleeved on the support column, two ends of the fifth spring are respectively in contact with the support sleeve and the fixed plate, and a movable plate is provided on the side wall of the support sleeve; It also includes a connection component and a guide component which are arranged on the movable plate and connected to the sliding sleeve and are used to control the connection state of the circuit.

[0014] As a further solution of the present invention: the connection component includes a partition arranged on the movable plate, a movable rod is slidably installed on the partition, a limit ring and a second power connection piece are provided on the movable rod, the limit ring is in contact with the partition, a first power connection piece electrically connected to the second power connection piece is provided on the support plate, a sixth spring is sleeved on the movable rod, and two ends of the sixth spring are respectively in contact with the partition and the second power connection piece.

[0015] As a further solution of the present invention: the guide assembly includes a guide groove formed on the movable plate, and the sliding sleeve is provided with a limiting column that is slidably engaged with the guide groove.

[0016] A protection method for a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid comprises the following steps: Step 1: When the current in the circuit is in a normal state, the adjustable resistor and the arc extinguishing resistor are both controlled to be in an off state through the follower component and the lifting and lowering switching mechanism; Step 2: When the current in the circuit is in a fluctuating state and is less than the rated threshold, the electromagnetic adsorption mechanism controls the rotation of the rotating rod, thereby controlling the operation of the adjustable resistor through the follower component and the lifting and lowering switching mechanism, thereby suppressing the current fluctuation; Step 3: When the current in the circuit exceeds the rated threshold, the electromagnetic adsorption mechanism controls the rotating rod to continue rotating, so that the adjustable resistor is disconnected and the arc extinguishing resistor is controlled to work; Step 4: At the same time, the electromagnetic adsorption mechanism will also drive the trigger power-off mechanism to work and perform a rapid power-off action.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present application can automatically adjust the working states of the adjustable resistor and the arc-extinguishing resistor according to the current changes in the circuit, so as to suppress the current fluctuations and perform arc extinguishing processing when the power is cut off. Specifically, under the action of the electromagnetic adsorption mechanism, the rotation of the rotating rod can be controlled according to the current changes in the circuit, so as to control the operation of the adjustable resistor or the arc-extinguishing resistor through the follow-up component and the lifting switching mechanism. Under the action of the adjustable resistor, the current fluctuations can be suppressed to prevent the problem of false tripping due to current fluctuations. Under the action of the arc-extinguishing resistor, when the power-off mechanism is triggered to perform the power-off action, the instantaneous energy generated by the power outage can be absorbed to extinguish the arc.

[0018] By adjusting the working status of the adjustable resistor and arc extinguishing resistor, the circuit can be effectively protected. During this process, the shunt and arc extinguishing functions are completely decoupled and do not interfere with each other. The resistance value is automatically selected according to the optimal working conditions to cope with different circuit conditions.

[0019] By monitoring the current state in the circuit, the fifth spring can be controlled to perform energy storage when the circuit is abnormal. When the circuit needs to be disconnected, the elastic potential energy of the fifth spring is released to control the second terminal plate to quickly separate from the first terminal plate, thereby achieving the purpose of rapid power off to reduce the generation of arcs during power off. After power off, the position of the sliding sleeve can be locked by the cooperation of the limit column and the transverse groove to prevent the circuit from being closed again due to misoperation, which may cause circuit damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a structural diagram of an embodiment of a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid.

[0021] Figure 2 This is a schematic diagram of the structure of the internal parts of a high-voltage switchgear for intelligently monitoring loads in a power grid, in one embodiment.

[0022] Figure 3 A schematic diagram of the connection relationship between part of the magnetic adsorption mechanism, the follower assembly, part of the lifting and switching mechanism, and part of the trigger power-off mechanism in an embodiment of a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligent monitoring of power grid loads.

[0023] Figure 4 for Figure 3 Schematic diagram of the structure from another angle.

[0024] Figure 5 This is a structural diagram of the follower component, part of the lifting and switching mechanism, and part of the triggering power-off mechanism in an embodiment of the circuit-breaking and arc-extinguishing high-voltage switchgear for intelligent monitoring of power grid loads.

[0025] Figure 6This is a structural diagram of part of the magnetic adsorption mechanism, follower assembly, and part of the lifting and switching mechanism in an embodiment of a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligent monitoring of power grid loads.

[0026] Figure 7 A schematic diagram of a partial cross-section structure of an embodiment of a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid.

[0027] Figure 8 for Figure 7 A magnified schematic diagram of the structure at point A.

[0028] Figure 9 This is a schematic diagram of the exploded structure of a rotating rod, a partial magnetic adsorption mechanism, and a follower assembly in an embodiment of a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligent monitoring of loads in a power grid.

[0029] Figure 10 This is a structural diagram of the lifting and switching mechanism in an embodiment of a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligent monitoring of loads in a power grid.

[0030] Figure 11 This is a structural diagram of a partially triggered power-off mechanism in an embodiment of a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid.

[0031] Figure 12 A schematic diagram of the explosion structure of a partially triggered power-off mechanism in an embodiment of a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid.

[0032] In the figure: 1, cabinet; 2, bracket; 3, support plate; 4, iron core; 5, coil; 6, rotating rod; 601, first spiral groove; 602, second spiral groove; 603, straight groove; 604, third spiral groove; 7, guide column; 8, connecting plate; 9, sliding sleeve; 901, first limit block; 10, first guide plate; 11, limit plate; 12, limit column; 13, first spring; 14, movable sleeve; 1401, second limit block; 15, second guide plate; 16, second spring; 17, first connecting rod; 18, third spring; 19 , first moving contact; 20, adjustable resistor; 2001, gear block; 21, first static contact; 22, second connection rod; 23, fourth spring; 24, second moving contact; 25, arc extinguishing resistor; 26, second static contact; 27, first contact piece; 28, fixed plate; 29, support column; 30, support sleeve; 31, fifth spring; 32, movable plate; 3201, vertical slot; 3202, oblique slot; 3203, horizontal slot; 3204, partition; 33, movable rod; 3301, limit ring; 34, sixth spring; 35, second contact piece. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0035] See also Figures 1 to 12 In an embodiment of the present invention, a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid includes: A cabinet 1, and a bracket 2 disposed in the cabinet 1, wherein the bracket 2 is provided with a support plate 3, a fixing plate 28, and an adjustable resistor 20, and the support plate 3 is provided with an arc-extinguishing resistor 25; Also includes: A rotating rod 6 is rotatably mounted on the support plate 3 , and an electromagnetic adsorption mechanism is provided on the support plate 3 for controlling the rotation of the rotating rod 6 and adjusting the resistance value of the adjustable resistor 20 ; A follower assembly is provided on the rotating rod 6, and a lifting switching mechanism is provided on the follower assembly. The follower assembly can control the power-on state of the adjustable resistor 20 and the arc-extinguishing resistor 25 through the lifting switching mechanism; The trigger power-off mechanism is provided on the fixing plate 28 and is used to perform a power-off action when the circuit exceeds a rated threshold.

[0036] Specifically, during normal operation of the circuit, in order to avoid problems such as frequent tripping caused by current fluctuations, an adjustable resistor 20 can be introduced to suppress current fluctuations. To this end, when the circuit current flows normally, the magnetic force generated by the electromagnetic adsorption mechanism is small, and the rotating rod 6 does not rotate. When the current in the circuit fluctuates, the electromagnetic adsorption mechanism drives the rotating rod 6 to rotate, thereby controlling the operation of the adjustable resistor 20 through the follower component and the lifting and lowering switching mechanism. At the same time, the resistance value of the adjustable resistor 20 can be dynamically adjusted by the electromagnetic adsorption mechanism according to the current fluctuation range to suppress the current fluctuation in real time. If a short circuit or severe overload occurs in the circuit, power off is required. At this time, the electromagnetic adsorption mechanism continues to control the rotation of the rotating rod 6, and controls the adjustable resistor 20 to disconnect through the follower component and the lifting and lowering switching mechanism, and controls the arc extinguishing resistor 25 to operate. At the same time, the electromagnetic adsorption mechanism also drives the triggering power-off mechanism to operate, and performs a rapid power-off action when the circuit exceeds the rated threshold. When the arc extinguishing resistor 25 and the rapid power-off operation are operated, the generation of the arc can be suppressed, thereby protecting the entire circuit.

[0037] See also Figures 1-9 The electromagnetic adsorption mechanism includes a first guide groove formed on the outer wall of the rotating rod 6, and the rotating rod 6 has a sliding sleeve 9 for axial sliding. The inner wall of the sliding sleeve 9 is provided with a first limit block 901 that slides in and out of the guide groove. The rotating rod 6 is sleeved with a first spring 13, and the two ends of the first spring 13 are respectively in contact with the sliding sleeve 9 and the support plate 3; it also includes a guide column 7 provided on the support plate 3, and the guide column 7 has a first guide plate 10 fixedly connected to the sliding sleeve 9 for axial sliding. A limit plate 11 is provided on the first guide plate 10, and an energizing component is provided on the support plate 3, and the energizing component includes an iron core 4 provided on the support plate 3, and a coil 5 is wound around the iron core 4.

[0038] In detail, the sliding sleeve 9 is made of iron material and can be attracted by magnetic force. A gear block 2001 is installed on the adjustable resistor 20 for adjusting the resistance value of the adjustable resistor 20. The first guide groove can be divided into two sections, namely a straight groove 603 and a third spiral groove 604, and the end of the straight groove 603 is connected to the end of the third spiral groove 604. In the initial state, the limit plate 11 and the gear block 2001 are in a separated state, and the first limit block 901 is located at the end of the stroke on the side of the straight groove 603 away from the third spiral groove 604, so that the distance between the sliding sleeve 9 and the iron core 4 is maximized, and the natural elongation of the first spring 13 is greater than the distance. In this regard, the first spring 13 is in a pre-compression state and always provides force to the sliding sleeve 9 to move away from the iron core 4.

[0039] When the cabinet 1 is powered on and the entire circuit is in normal operation, the magnetic force generated by the coil 5 and the iron core 4 is small, and the adsorption force provided to the sliding sleeve 9 by the magnetic force cannot overcome the thrust provided to the sliding sleeve 9 by the first spring 13. Therefore, the sliding sleeve 9 will not move. When the current in the circuit increases and the current fluctuation is small, the magnetic force generated by the coil 5 and the iron core 4 will increase and overcome the thrust of the first spring 13, thereby controlling the sliding sleeve 9 to move along the length direction of the rotating rod 6, so that the first guide plate 10 moves along the length direction of the guide column 7. Under the action of the guide column 7, the sliding sleeve 9 can only slide axially along the rotating rod 6 and will not rotate. Therefore, the sliding sleeve 9 will drive the first limit block 901 to slide along the straight groove 603. Under the action of the first limit block 901 and the straight groove 603, the rotating rod 6 remains in a fixed state. If a large current fluctuation is generated in the circuit due to the start and stop of the electrical equipment, the magnetic force generated by the coil 5 and the iron core 4 continues to increase, causing the sliding sleeve 9 to continue to move, so as to control the first limit block 901 to disengage from the straight groove 603 and enter the third spiral groove 604, thereby driving the rotating rod 6 to rotate. Under the action of the rotating rod 6, the adjustable resistor 20 is controlled to be connected through the follow-up component and the lifting switching mechanism, and is in a parallel state with the circuit. Under the action of the adjustable resistor 20, the circuit is shunted to suppress the current fluctuation. If the current fluctuation range increases, the stroke of the sliding sleeve 9 continues to increase, thereby controlling the movement of the gear block 2001 through the limit plate 11, so that the resistance value of the adjustable resistor 20 increases, so as to realize adaptive adjustment of the resistance value of the adjustable resistor 20 according to the current fluctuation in the circuit, which can not only play the effect of controlling the circuit fluctuation and suppressing the current fluctuation, but also prevent the problem of frequent false tripping due to current fluctuation.

[0040] See also Figure 3-Figure 7 、 Figure 9 、 Figure 10 The follower assembly includes a second guide groove formed on the outer wall of the circumference of the rotating rod 6, and the rotating rod 6 has a movable sleeve 14 for axial sliding. The inner wall of the movable sleeve 14 is provided with a second limit block 1401 that slides in and out of the second guide groove; it also includes a second guide plate 15 that slides axially along the guide column 7 and is fixedly connected to the movable sleeve 14, a connecting plate 8 is provided on the guide column 7, and a second spring 16 is sleeved on the rotating rod 6, and the two ends of the second spring 16 are respectively in contact with the second guide plate 15 and the support plate 3.

[0041] See also Figure 3-Figure 7 、 Figure 9 、 Figure 10The lifting and switching mechanism includes a first static contact 21 provided on the support plate 3, a first connecting rod 17 electrically connected to the adjustable resistor 20 is slidably mounted on the second guide plate 15, a first moving contact 19 and a first fixing ring are provided on the first connecting rod 17, the first moving contact 19 cooperates with the first static contact 21, the first fixing ring contacts with the second guide plate 15, a third spring 18 is sleeved on the first connecting rod 17, and the two ends of the third spring 18 are respectively in contact with the first moving contact 19 and the second guide plate 15. The lifting and switching mechanism also includes a second static contact 26 arranged on the connecting plate 8, and a second connecting rod 22 electrically connected to the arc extinguishing resistor 25 is slidably mounted on the second guide plate 15. A second moving contact 24 and a second fixed ring are provided on the second connecting rod 22. The second moving contact 24 cooperates with the second static contact 26, and the second fixed ring is in contact with the second guide plate 15. A fourth spring 23 is sleeved on the second connecting rod 22, and the two ends of the fourth spring 23 are respectively in contact with the second moving contact 24 and the second guide plate 15.

[0042] It should be noted that when the first moving contact 19 and the second moving contact 24 have not yet contacted the first static contact 21 and the second static contact 26, the natural extension of the third spring 18 and the fourth spring 23 is greater than the distance between the first moving contact 19 and the second moving contact 24 and the second guide plate 15. Therefore, the third spring 18 and the fourth spring 23 are in a pre-compression state, and always provide a force to the first moving contact 19 and the second moving contact 24 to move away from the second guide plate 15, so that the first fixing ring and the second fixing ring are in abutment with the second guide plate 15. The second spring 16 is also in a pre-compression state, and the natural extension of the second spring 16 is greater than the maximum distance between the second guide plate 15 and the adjacent support plate 3. Therefore, under the action of the second spring 16, the second guide plate 15 is controlled to have a tendency to move toward the connecting plate 8.

[0043] The second guide groove can be divided into two sections, namely a first spiral groove 601 and a second spiral groove 602. The pitch of the first spiral groove 601 is smaller than the pitch of the second spiral groove 602. The axial length of the first spiral groove 601 in the rotating rod 6 is smaller than the axial length of the second spiral groove 602 in the rotating rod 6. The angle formed by the first spiral groove 601 in the circumferential direction of the rotating rod 6 is larger than the angle formed by the second spiral groove 602 in the circumferential direction of the rotating rod 6. In the initial state, under the action of the second spring 16, the second limit block 1401 is located at the end of the stroke of the first spiral groove 601 away from the second spiral groove 602, and the port is located at the same axial position as the port of the straight groove 603. At this time, the distance between the second guide plate 15 and the first static contact 21 and the second static contact 26 is equal. When the current in the circuit fluctuates greatly, the sliding sleeve 9 will control the first limit block 901 to enter the third spiral groove 604, so that the rotating rod 6 rotates, thereby driving the first spiral groove 601 and the second spiral groove 602 to move. At this time, the second limit block 1401 is relatively The rotating rod 6 will slide along the first spiral groove 601, thereby driving the second guide plate 15 to move away from the connecting plate 8 through the movable sleeve 14. The second guide plate 15 will drive the first connection rod 17 and the second connection rod 22 to move synchronously, thereby driving the first movable contact 19 to move toward the first static contact 21 and driving the second movable contact 24 to move away from the second static contact 26. When the rotating rod 6 rotates slightly, the first movable contact 19 will move to a position of connection with the first static contact 21, causing the adjustable resistor 20 to operate, thereby suppressing current fluctuations in the circuit. If the current fluctuation value in the circuit increases, the rotating rod 6 will continue to rotate, causing the second limit block 1401 to continue to slide along the first spiral groove 601, so that the distance between the second guide plate 15 and the connecting plate 8 gradually increases. At this time, the second spring 16 and the third spring 18 will be compressed, and the first moving contact 19 and the first static contact 21 will always remain in the connected state, so as to keep the adjustable resistor 20 in the working state. If the current in the circuit is in a state of continuous increase, it means that the circuit may be short-circuited or the load exceeds the rated threshold. At this time, the first limit block 901 continues to slide along the third spiral groove 604, causing the rotating rod 6 to continue to rotate, and the second limit block 1401 will cross the connection position of the first spiral groove 601 and the second spiral groove 602 and enter the second spiral groove 602, so that the second spring 16 and the third spring 18 are elastically released to drive the second guide plate 15 to move toward the direction close to the connecting plate 8. The second guide plate 15 will also drive the first connection rod 17 and the second connection rod 22 Movement causes the first moving contact 19 to separate from the first static contact 21, and the adjustable resistor 20 to be disconnected. At the same time, the second moving contact 24 moves to the position connected with the second static contact 26, so that the arc extinguishing resistor 25 works, and the arc extinguishing resistor 25 is also in parallel with the circuit. When the first limit block 901 moves to the end of the stroke of the third spiral groove 604 away from the side of the straight groove 603, the second limit block 1401 also moves to the end of the stroke of the second spiral groove 602 away from the side of the first spiral groove 601. At this time, power-off processing is required, and the circuit is disconnected under the action of triggering the power-off mechanism.

[0044] Preferably, the resistance value of the arc-extinguishing resistor 25 is the rated value and is much larger than the resistance value of the adjustable resistor 20. In this regard, by adjusting the working states of the adjustable resistor 20 and the arc-extinguishing resistor 25, when the current in the circuit fluctuates, the current fluctuation can be suppressed to prevent false tripping caused by current fluctuations. When a short circuit occurs in the circuit or the load exceeds the maximum rated threshold, the arc-extinguishing resistor 25 is switched to absorb the transient energy generated when the circuit is disconnected, thereby extinguishing the arc and protecting the entire circuit. In this process, the shunting and arc-extinguishing functions are completely decoupled and do not interfere with each other. The resistance value is automatically selected according to the optimal working conditions to cope with different circuit conditions.

[0045] See also Figure 3-Figure 5 、 Figure 11 、 Figure 12 The trigger power-off mechanism includes a support column 29 provided on the fixed plate 28, and a support sleeve 30 is provided for the axial sliding of the support column 29. A fifth spring 31 is sleeved on the support column 29, and the two ends of the fifth spring 31 are respectively in contact with the support sleeve 30 and the fixed plate 28. A movable plate 32 is provided on the side wall of the support sleeve 30; and further includes a connection component and a guide component provided on the movable plate 32 and connected to the sliding sleeve 9 for controlling the circuit connection state. The connection component includes a partition 3204 provided on the movable plate 32, and the partition 320 4 is slidably mounted on a movable rod 33, and a limit ring 3301 and a second power contact piece 35 are provided on the movable rod 33, and the limit ring 3301 is in contact with the partition 3204, and a first power contact piece 27 electrically connected to the second power contact piece 35 is provided on the support plate 3, and a sixth spring 34 is sleeved on the movable rod 33, and the two ends of the sixth spring 34 are respectively in contact with the partition 3204 and the second power contact piece 35, and the guide assembly includes a guide groove formed on the movable plate 32, and the sliding sleeve 9 is provided with a limit column 12 that is slidably engaged with the guide groove.

[0046] Furthermore, a keyway is formed on the inner wall of the support sleeve 30, and a key that cooperates with the keyway is provided on the support column 29. Under the action of the key and the keyway, it is ensured that the support sleeve 30 can only slide axially along the support column 29. The guide groove can be divided into three sections, namely the vertical groove 3201, the oblique groove 3202, and the transverse groove 3203. The ends of the vertical groove 3201, the oblique groove 3202, and the transverse groove 3203 are sequentially connected to each other. In the initial state, under the action of the first spring 13, the sliding sleeve 9 is located at the end of the stroke away from the iron core 4. The limiting column 12 is located at the end of its travel on the side of the vertical slot 3201 away from the inclined slot 3202. Under the action of the limiting column 12 and the vertical slot 3201, the position of the movable plate 32 is locked, thereby ensuring that the position of the support sleeve 30 on the support column 29 will not shift. At this time, the distance between the adjacent fixed plates 28 that are closer to the support sleeve 30 is less than the natural extension of the fifth spring 31. The fifth spring 31 is in a pre-compressed state and always provides a force for the support sleeve 30 to move away from the fixed plate 28. Under the action of the movable plate 32, the distance between the partition 3204 and the first terminal 27 is shortened, and this distance is smaller than the natural extension of the sixth spring 34. In response, the sixth spring 34 controls the second terminal 35 to abut against the first terminal 27, so that the circuit is in the on state. When the current in the circuit is at a normal value or has a small fluctuation, the magnetic force generated is small. Under the action of the magnetic force, the sliding sleeve 9 has a small movement stroke, causing the first limit block 901 to slide in the straight groove 603. Therefore, the sliding sleeve 9 will drive the limit post 12 to slide in the vertical groove 3201, so that the position of the movable plate 32 does not change. If the current in the circuit fluctuates greatly, the first limit block 901 will enter the third spiral groove 604. At the same time, the sliding sleeve 9 will drive the limit post 12 to enter the inclined groove 3202, causing the movable plate 32 to move toward the adjacent fixed plate 28, thereby compressing the fifth spring 31 through the support sleeve 30. If the circuit is in a short circuit or the load exceeds the rated threshold, the sliding sleeve 9 will move rapidly, causing the first limit block 901 to move to the end of the stroke of the third spiral groove 604. During this process, under the action of the second limit block 1401 and the second guide groove, the adjustable resistor 20 is disconnected and the arc extinguishing resistor 25 is activated. At the same time, the limit column 12 will move to the connection position of the oblique groove 3202 and the transverse groove 3203. The stored energy compression of the fifth spring 31 reaches the maximum, and the fifth spring 31 is elastically released quickly, causing the support sleeve 30 to move rapidly in the direction away from the fixed plate 28, thereby driving the partition 3204 to move through the movable plate 32, so as to drive the second power terminal 35 to quickly separate from the first power terminal 27 through the movable rod 33 and the limit ring 3301. Under the action of the limit column 12 and the transverse groove 3203, the reset of the sliding sleeve 9 can be restricted to ensure that the circuit is always in the disconnected state before the circuit is repaired.

[0047] An automatic switch may be provided on the arc extinguishing resistor 25. When the first terminal 27 is separated from the second terminal 35, a tripping signal is released to control the arc extinguishing resistor 25 to be automatically disconnected, thereby preventing the arc extinguishing resistor 25 from being energized for a long time.

[0048] Preferably, by monitoring the current state in the circuit, the fifth spring 31 can be controlled to perform energy storage when the circuit is abnormal, and when the circuit needs to be disconnected, the elastic potential energy of the fifth spring 31 is released to control the second power terminal 35 to quickly separate from the first power terminal 27, thereby achieving the purpose of rapid power off to reduce the generation of arcs during power off. After power off, the position of the sliding sleeve 9 can also be locked by the cooperation of the limit column 12 and the transverse groove 3203 to prevent the circuit from being closed again due to misoperation, resulting in circuit damage.

[0049] A protection method for a circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid comprises the following steps: Step 1: When the current in the circuit is in a normal state, the adjustable resistor 20 and the arc extinguishing resistor 25 are both controlled to be in an off state through the follower component and the lifting and lowering switching mechanism; Step 2: When the current in the circuit is in a fluctuating state and is less than the rated threshold, the electromagnetic adsorption mechanism controls the rotation of the rotating rod 6, thereby controlling the operation of the adjustable resistor 20 through the follower assembly and the lifting and lowering switching mechanism, thereby suppressing the current fluctuation; Step 3: When the current in the circuit exceeds the rated threshold, the electromagnetic adsorption mechanism controls the rotating rod 6 to continue rotating, so that the adjustable resistor 20 is disconnected and the arc extinguishing resistor 25 is controlled to operate; Step 4: At the same time, the electromagnetic adsorption mechanism will also drive the trigger power-off mechanism to work and perform a rapid power-off action.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0051] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A circuit-breaking and arc-extinguishing high-voltage switchgear for intelligent monitoring of loads in a power grid, comprising: A cabinet body, and a bracket arranged in the cabinet body, wherein the bracket is provided with a support plate, a fixing plate and an adjustable resistor, and the support plate is provided with an arc-extinguishing resistor; It is characterized by further comprising: A rotating rod is rotatably mounted on the support plate, and an electromagnetic adsorption mechanism is provided on the support plate for controlling the rotation of the rotating rod and adjusting the resistance value of the adjustable resistor; A follower assembly is provided on the rotating rod, and a lifting switching mechanism is provided on the follower assembly, and the follower assembly can control the power-on state of the adjustable resistor and the arc-extinguishing resistor through the lifting switching mechanism; The power-off mechanism is triggered and arranged on the fixing plate, and is used for performing a power-off action when the circuit exceeds a rated threshold.

2. The circuit-breaking and arc-extinguishing high-voltage switchgear for intelligent monitoring loads of a power grid according to claim 1, characterized in that: The electromagnetic adsorption mechanism includes a first guide groove formed on the outer wall of the rotating rod, a sliding sleeve is provided for axial sliding of the rotating rod, a first limit block is provided on the inner wall of the sliding sleeve and is slidably engaged with the guide groove, and a first spring is sleeved on the rotating rod, and two ends of the first spring are respectively in contact with the sliding sleeve and the support plate; It also includes a guide column arranged on the support plate, the axial sliding of the guide column has a first guide plate fixedly connected to the sliding sleeve, a limit plate is arranged on the first guide plate, and an electric component is arranged on the support plate.

3. The circuit-breaking and arc-extinguishing high-voltage switchgear for intelligent monitoring loads of a power grid according to claim 2, characterized in that: The power supply component includes an iron core arranged on the support plate, and a coil is wound around the iron core.

4. The circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid according to claim 2, characterized in that: The follower assembly includes a second guide groove formed on the outer wall of the rotating rod, a movable sleeve is axially slidable on the rotating rod, and a second limit block is provided on the inner wall of the movable sleeve to slide and engage with the second guide groove; It also includes a second guide plate that slides axially along the guide column and is fixedly connected to the movable sleeve. A connecting plate is provided on the guide column. A second spring is sleeved on the rotating rod. The two ends of the second spring are respectively in contact with the second guide plate and the support plate.

5. The circuit-breaking and arc-extinguishing high-voltage switchgear for intelligent monitoring loads of a power grid according to claim 4, characterized in that: The lifting switching mechanism includes a first static contact arranged on the support plate, a first connecting rod electrically connected to the adjustable resistor is slidably installed on the second guide plate, a first moving contact and a first fixing ring are provided on the first connecting rod, the first moving contact cooperates with the first static contact, the first fixing ring is in contact with the second guide plate, a third spring is sleeved on the first connecting rod, and two ends of the third spring are respectively in contact with the first moving contact and the second guide plate.

6. The circuit-breaking and arc-extinguishing high-voltage switchgear for intelligent monitoring loads of a power grid according to claim 5, characterized in that: The lifting and switching mechanism also includes a second static contact arranged on the connecting plate, a second connecting rod electrically connected to the arc extinguishing resistor is slidably installed on the second guide plate, a second connecting rod is provided with a second moving contact and a second fixed ring, the second moving contact cooperates with the second static contact, the second fixed ring is in contact with the second guide plate, a fourth spring is sleeved on the second connecting rod, and two ends of the fourth spring are respectively in contact with the second moving contact and the second guide plate.

7. The circuit-breaking and arc-extinguishing high-voltage switchgear for intelligent monitoring loads of a power grid according to claim 2, characterized in that: The trigger power-off mechanism includes a support column arranged on the fixed plate, an axially sliding support sleeve of the support column, a fifth spring sleeved on the support column, two ends of the fifth spring respectively abutting against the support sleeve and the fixed plate, and a movable plate provided on the side wall of the support sleeve; It also includes a connection component and a guide component which are arranged on the movable plate and connected to the sliding sleeve and are used to control the connection state of the circuit.

8. The circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid according to claim 7, characterized in that: The connection assembly includes a partition arranged on the movable plate, a movable rod is slidably mounted on the partition, a limit ring and a second power connection piece are provided on the movable rod, the limit ring is in contact with the partition, a first power connection piece electrically connected to the second power connection piece is provided on the support plate, a sixth spring is sleeved on the movable rod, and two ends of the sixth spring are respectively in contact with the partition and the second power connection piece.

9. The circuit-breaking and arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid according to claim 7, characterized in that: The guide assembly includes a guide groove formed on the movable plate, and the sliding sleeve is provided with a limiting column that is slidably engaged with the guide groove.

10. A protection method for a circuit-breaking arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid, using the circuit-breaking arc-extinguishing high-voltage switchgear for intelligently monitoring loads in a power grid as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: When the current in the circuit is in a normal state, the adjustable resistor and the arc extinguishing resistor are controlled to be in an off state through the follower component and the lifting and lowering switching mechanism; Step 2: When the current in the circuit is in a fluctuating state and is less than the rated threshold, the electromagnetic adsorption mechanism controls the rotation of the rotating rod, thereby controlling the operation of the adjustable resistor through the follower component and the lifting and lowering switching mechanism, thereby suppressing the current fluctuation; Step 3: When the current in the circuit exceeds the rated threshold, the electromagnetic adsorption mechanism controls the rotating rod to continue rotating, so that the adjustable resistor is disconnected and the arc extinguishing resistor is controlled to work; Step 4: At the same time, the electromagnetic adsorption mechanism will also drive the trigger power-off mechanism to work and perform a rapid power-off action.

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