CN112700949B

CN112700949B - Current-limiting reactor structure for limiting overcurrent of power system

Info

Publication number: CN112700949B
Application number: CN202011420302.6A
Authority: CN
Inventors: 屈汉明
Original assignee: Shandong Taikai Power Electronic Co ltd
Current assignee: SHANDONG TAIKAI POWER ELECTRONIC Co.,Ltd.
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2022-01-11
Anticipated expiration: 2040-12-08
Also published as: CN112700949A

Abstract

The invention relates to the technical field of circuit protection, and discloses a current-limiting reactor structure for limiting overcurrent of an electric power system. Elasticity contactor can break away from and reset fast and contact with II contacts of contact carrier under the effect of self elasticity this moment with the contact carrier, the open circuit time in the elasticity contactor replacement contact process has been shortened, the device stability has further been improved, contact once more with II contacts of contact carrier when elasticity contactor, reactor II is the access line together with reactor I this moment, thereby the inductive reactance effect has been improved, thereby realize the effect of adjusting the inductive reactance of reactor through the process of not demolising and installing, avoid traditional reactor need dismantle it when needs adjust and install and cause complex operation's problem, the practicality of the device has been improved.

Description

Current-limiting reactor structure for limiting overcurrent of power system

Technical Field

The invention relates to the technical field of line protection, in particular to a current-limiting reactor structure for limiting overcurrent of a power system.

Background

The current-limiting reactor is a very common electrical element, and is usually applied to a power grid, the reactor is essentially an air-core coil without magnetic conductive materials, and can be arranged into three assembly forms of vertical, horizontal and delta-shaped according to requirements, when a short circuit occurs in a circuit, a short-circuit current with a large value can be generated, the reactor increases short-circuit impedance through self inductive reactance, the short-circuit current is limited, and the electrical element connected with the circuit is prevented from being damaged by high current.

The current-limiting reactor structure of the existing power system for limiting the overcurrent is simple, the types of the current-limiting reactor structure are distributed, the current-limiting reactor structure of the applicable power system for limiting the overcurrent is available in different use environments, the number of wire windings on the existing reactor is generally certain, the inductance degree of the existing reactor is unchanged, the use range of the existing reactor is limited, once the peak value of the trigger current needs to be changed, the type of the reactor needs to be changed, the processes of disassembly and assembly are time-consuming and labor-consuming, and the device has certain limitation in the use process.

Disclosure of Invention

Aiming at the defects of the current limiting reactor structure for limiting the overcurrent of the existing power system in the background technology in the using process, the invention provides the current limiting reactor structure for limiting the overcurrent of the power system, which has the advantage of changing the number of turns of a winding at any time and solves the problem of complex operation caused by the fact that the original equipment needs to be disassembled and replaced when the peak value of the trigger current is changed.

The invention provides the following technical scheme: the utility model provides an electric power system restriction overcurrent's current-limiting reactor structure, includes the base, top fixed mounting has stop device on the position that the base is located the outside, stop device's top fixed mounting has power device, fixed mounting has the supporting seat on the position that the top of base is located the center, the surface activity cover of supporting seat is equipped with the bottom of spring and the top fixed connection of base, the top fixed mounting of supporting seat has the bottom of holder and the top fixed connection of spring, reactance device has been cup jointed in the surface activity of holder, reactance device's top movable mounting has the screwed pipe, the top fixed mounting of screwed pipe has the top of driving shaft and fixed cup jointing with power device.

Preferably, the power device comprises a top cover, the top cover is fixedly installed at the top of the limiting device, an annular seat is fixedly installed at the top of the top cover, a fixed sleeve is fixedly installed at the top of the annular seat, a power machine is fixedly sleeved inside the fixed sleeve, an output shaft of the power machine penetrates through the annular seat and the top cover and extends to the inside of the limiting device, a driving block is fixedly installed at one end of the output shaft of the power machine, an installation sleeve is fixedly installed at the bottom of the top cover, a bearing is movably sleeved inside the installation sleeve, the position, close to the top, of the outer surface of the driving shaft is movably sleeved with the bearing, and the top of the driving shaft is fixedly sleeved with the driving block.

Preferably, reactance device includes reactor I, one side fixed mounting that I surface of reactor is close to the top has access support I, one side fixed mounting that I surface of reactor is close to the bottom has contact support, contact support's one end fixed mounting has reactor II, one side fixed mounting that II surfaces of reactor are close to the bottom has contact support II, the one end fixed mounting of contact support II has reactor III, one side fixed mounting that III surfaces of reactor are close to the bottom has the contact tailstock.

Preferably, reactor I includes threaded sleeve, threaded sleeve's inner wall surface is provided with screw thread and threaded sleeve activity cup joints on the surface of holder, threaded sleeve's external fixed surface has cup jointed the inductance coil, threaded sleeve's bottom regulation is installed the bottom and reactor II fixed connection of connecting pipe and connecting pipe, reactor I's structure is the same with reactor II and reactor III's structure and reactor I, reactor II and reactor III between through contact support and the II interconnect of contact support and constitute wholly, reactor I, reactor II and reactor III constitute whole both sides equal fixed mounting have access support I and contact tailstock, the length of contact support top is greater than the length of contact support bottom.

Preferably, the outer surface of the threaded pipe is provided with threads, the threads are matched with the threads on the inner wall surface of the threaded sleeve, and the height of the threaded pipe is the same as that of the connecting pipe.

Preferably, stop device includes the shell, one side fixed mounting of shell surface has the guide rail frame, the bottom of guide rail frame has been seted up bar hole and contact support II stretches out from this bar hole, one side fixed mounting of guide rail frame has the installing support, one side fixed mounting of installing support has the elasticity contactor, the spacing groove has been seted up to the opposite side of shell surface, the both sides fixed mounting of spacing inslot portion has the limiting plate just insert support I and stretch out from the gap between the limiting plate.

Preferably, the elastic contactor is made of an elastic conductive material.

The invention has the following beneficial effects:

1. according to the invention, the thread is arranged on the outer surface of the threaded pipe and is matched with the thread on the inner wall surface of the threaded sleeve, and the bottom of the retainer is fixedly connected with the top of the spring, so that when the power machine drives the threaded pipe to rotate, the reactance device can have a movement trend along the vertical upward direction in figure 2 under the elastic force of the spring, so that the threaded pipe rotates until the thread on the outer surface is matched with the thread on the inner surface of the threaded sleeve, at the moment, the reactance device cannot rotate in the axial direction and moves along the vertical upward direction in figure 2 under the screwing action of the thread through the contact support and the contact support II extending out of the strip-shaped hole and the access support I extending out of the gap between the limiting plates, at the moment, the access support I can be firstly contacted with the contact support, so that two sides of the reactor I are mutually communicated, namely the reactor I is accessed into a circuit, at the moment, an inductive reactance coil in the reactor I starts to play a role, if the inductive reactance of the reactor I cannot meet the requirement of protecting short-circuit current in the existing line, the power machine can continue to drive the threaded pipe to rotate, so that the reactance device moves along the vertical upward direction in the figure 2 again, the height of the top end of the contact support in the moving process is gradually higher than that of the elastic contactor, the elastic contactor is made of elastic conductive materials, the elastic contactor can find elastic deformation to keep a moving state with the contact support, the phenomenon that the device is disconnected from the line and loses the protection effect on the line due to the fact that the elastic contactor is separated from the contact support or the contact support II in the moving process of the reactance device is avoided, the stability of the device is improved, and when the reactance device continues to rise, so that the height of the top end of the contact support is too high to continue to contact with the elastic contactor, elasticity contactor can break away from and reset fast and contact with II contacts of contact support under the effect of self elasticity this moment with the contact support, the open circuit time in the elasticity contactor replacement contact process has been shortened, the device's stability has further been improved, after elasticity contactor and II contacts once more of contact support, reactor II is connected into the circuit together with reactor I this moment, thereby the inductive reactance effect has been improved, thereby realize carrying out the effect of adjusting to the inductive reactance of reactor through the process of not demolising and installing, it needs to dismantle and install it and cause complex operation's problem when needs are adjusted to have avoided traditional, the operation degree of difficulty of the device in the use has been reduced.

2. According to the invention, through the modular design among the reactor I, the reactor II and the reactor III, coils incorporated into a circuit are distributed in a segmented mode, if the phenomenon of fusing occurs due to overlarge load in a short circuit, a single module can be quickly replaced, compared with the original integral design, the design mode can avoid the whole coil winding from being burnt out to improve the maintenance cost, meanwhile, the burnt module can be quickly replaced, the maintenance time required after the device breaks down is shortened, the production efficiency is improved, in addition, the modular design can replace the number of modules with actual requirements, so that the application range of the device is further expanded, and the application range of the device is improved.

3. According to the invention, the driving shaft is fixedly arranged at the top of the threaded pipe, so that the driving shaft can drive the threaded pipe to rotate and drive the reactance device to move, and meanwhile, the driving shaft can be used as a hollow core rod and is positioned in the reactor I, the reactor II and the reactor III so as to enhance the inductive reactance effect of the device, thereby improving the impedance effect of the device on the short circuit effect.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of the structure of the present invention;

FIG. 3 is a schematic view of a structural power unit of the present invention;

FIG. 4 is a schematic cross-sectional view of a structural power unit of the present invention;

FIG. 5 is a schematic diagram of a structural reactance device of the present invention;

FIG. 6 is a cross-sectional schematic view of a structural reactance device of the present invention;

FIG. 7 is an enlarged view of the point A in FIG. 6;

FIG. 8 is a schematic view of a structural stop device of the present invention;

fig. 9 is a schematic cross-sectional view of the structural position limiting device of the present invention.

In the figure: 1. a base; 2. a limiting device; 21. a housing; 22. a guide rail bracket; 23. mounting a bracket; 24. an elastic contactor; 25. a limiting groove; 26. a limiting plate; 3. a power plant; 31. a top cover; 32. an annular seat; 33. fixing the sleeve; 34. a power machine; 35. a drive block; 36. installing a sleeve; 37. a bearing; 4. a supporting seat; 5. a spring; 6. a holder; 7. a reactance device; 71. a reactor I; 711. a threaded sleeve; 712. an inductive reactance coil; 713. a connecting pipe; 72. accessing a bracket I; 73. contacting the stent; 74. a reactor II; 75. contacting the bracket II; 76. a reactor III; 77. contacting the tail stock; 8. a threaded pipe; 9. a drive shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-9, a current-limiting reactor structure for limiting overcurrent in an electrical power system includes a base 1, a limiting device 2 is fixedly mounted on the top of the base 1 at the outer side, the limiting device 2 includes a housing 21, a guide rail frame 22 is fixedly mounted on one side of the outer surface of the housing 21, a strip-shaped hole is formed in the bottom of the guide rail frame 22, a contact bracket 73 and a contact bracket ii 75 extend out of the strip-shaped hole, a mounting bracket 23 is fixedly mounted on one side of the guide rail frame 22, an elastic contactor 24 is fixedly mounted on one side of the mounting bracket 23, the elastic contactor 24 is made of an elastic conductive material, a limiting groove 25 is formed in the other side of the outer surface of the housing 21, limiting plates 26 are fixedly mounted on two sides inside the limiting groove 25, an access bracket i 72 extends out of a gap between the limiting plates 26, and a power device 3 is fixedly mounted on the top of the limiting device 2, the power device 3 comprises a top cover 31, the top cover 31 is fixedly arranged at the top of the limiting device 2, an annular seat 32 is fixedly arranged at the top of the top cover 31, a fixed sleeve 33 is fixedly arranged at the top of the annular seat 32, a power machine 34 is fixedly sleeved inside the fixed sleeve 33, an output shaft of the power machine 34 penetrates through the annular seat 32 and the top cover 31 and extends into the limiting device 2, a driving block 35 is fixedly arranged at one end of the output shaft of the power machine 34, an installation sleeve 36 is fixedly arranged at the bottom of the top cover 31, a bearing 37 is movably sleeved inside the installation sleeve 36, the position, close to the top, of the outer surface of the driving shaft 9 is movably sleeved with the bearing 37, the top of the driving shaft 9 is fixedly sleeved with the driving block 35, a support seat 4 is fixedly arranged at the position, located at the center, of the top of the base 1 is movably sleeved with a spring 5, and the bottom of the spring 5 is fixedly connected with the top of the base 1, the top of the supporting seat 4 is fixedly provided with a retainer 6, the bottom of the retainer 6 is fixedly connected with the top of the spring 5, the outer surface of the retainer 6 is movably sleeved with a reactance device 7, the reactance device 7 comprises a reactor I71, the reactor I71 comprises a threaded sleeve 711, the inner wall surface of the threaded sleeve 711 is provided with threads, the threaded sleeve 711 is movably sleeved on the outer surface of the retainer 6, the outer surface of the threaded sleeve 711 is fixedly sleeved with an inductive reactance coil 712, the bottom of the threaded sleeve 711 is provided with a connecting pipe 713 in a regulated manner, the bottom of the connecting pipe 713 is fixedly connected with a reactor II 74, the outer surface of the threaded pipe 8 is provided with threads, the threads are matched with the threads on the inner wall surface of the threaded sleeve 711, the height of the threaded pipe 8 is the same as that of the connecting pipe 713, the structure of the reactor I71 is completely the same as that of the reactors II 74 and III 76, and the structures of the reactors I71 and III 71, The reactor II 74 and the reactor III 76 are connected with each other through a contact support 73 and a contact support II 75 to form a whole, both sides of the whole consisting of the reactor I71, the reactor II 74 and the reactor III 76 are fixedly provided with an access support I72 and a contact tail frame 77, the length of the top of the contact support 73 is larger than that of the bottom of the contact support 73, one side of the outer surface of the reactor I71 close to the top is fixedly provided with the access support I72, one side of the outer surface of the reactor I71 close to the bottom is fixedly provided with the contact support 73, one end of the contact support 73 is fixedly provided with the reactor II 74, one side of the outer surface of the reactor II 74 close to the bottom is fixedly provided with the contact support II 75, one end of the contact support II 75 is fixedly provided with the reactor III 76, one side of the outer surface of the reactor III 76 close to the bottom is fixedly provided with the contact tail frame 77, and the top of the reactor device 7 is movably provided with a threaded pipe 8, the top of screwed pipe 8 is fixed with driving shaft 9 and the top of driving shaft 9 is fixed with power device 3 and is cup jointed.

Wherein, through the outer surface of the threaded pipe 8 being provided with threads and the threads matching with the threads on the inner wall surface of the threaded sleeve 711, and the bottom of the retainer 6 being fixedly connected with the top of the spring 5, when the power machine 34 rotates the driving threaded pipe 8, the reactance device 7 will have a tendency of moving in the vertical upward direction in fig. 2 by the elastic force of the spring 5, so that the threaded pipe 8 rotates until the threads on the outer surface are matched with the threads on the inner surface of the threaded sleeve 711, at this time, the contact bracket 73 and the contact bracket ii 75 protrude from the strip-shaped hole and the access bracket i 72 protrudes from the gap between the limit plates 26, so that the reactance device 7 cannot rotate in the axial direction and the reactance device 7 moves in the vertical upward direction in fig. 2 by the screwing action of the threads, at this time, the access bracket i 72 will contact the contact bracket 73 first, therefore, two sides of the reactor I71 are communicated with each other, namely, the reactor I71 is connected into a circuit, at the moment, the inductive reactance coil 712 in the reactor I71 starts to play a role, if the inductive reactance of the reactor I71 cannot meet the requirement of protecting short-circuit current in the existing circuit, at the moment, the power machine 34 can continue to drive the threaded pipe 8 to rotate, the reactance device 7 moves along the vertical upward direction in the figure 2 again, the height of the top end of the contact support 73 is gradually higher than that of the elastic contactor 24 in the moving process, the elastic contactor 24 is made of elastic conductive materials, the elastic contactor 24 can be elastically deformed to keep the movement state with the contact support 73, and the phenomenon that the device is disconnected from the circuit to lose the protection effect on the circuit due to the fact that the elastic contactor 24 is separated from the contact support 73 or the contact support II 75 in the moving process of the reactance device 7 is avoided, the stability of the device is improved, when the reactance device 7 is further lifted, so that the height of the top end of the contact bracket 73 is too high to be further contacted with the elastic contactor 24, at this time, the elastic contactor 24 can be separated from the contact bracket 73 and can be quickly reset under the action of the self elastic force and can be contacted with the contact bracket II 75, the open-circuit time of the replacement contact process of the elastic contactor 24 is shortened, the stability of the device is further improved, when the elastic contactor 24 is contacted with the contact bracket II 75 again, the reactor II 74 and the reactor I71 are connected into the circuit together, thereby improved the inductance effect to the realization need dismantle and install and cause complex operation's problem to it when needs adjust traditional reactor to the inductance of the process of not dismantling and installing the reactor effect of adjusting, has improved the device's practicality.

Wherein, through the modularized design between I71, II 74 and III 76 of reactor for the coil that merges in the circuit distributes with the form in the segmentation, if when too big and appear the phenomenon of fusing in the short circuit load, can change single module fast, compare in original integral design, this kind of design can avoid whole coil winding to be burnt out and improve cost of maintenance, also can change the module that burns out fast simultaneously, required maintenance duration after having shortened the device and having broke down, production efficiency is improved, furthermore, the modularized design can have more actual demand and replace the quantity of module, thereby make the device's application scope further expand, the practicality that has improved the device.

Wherein, a driving shaft 9 is fixedly installed on the top of the threaded pipe 8, so that while the driving shaft 9 can drive the threaded pipe 8 to rotate and drive the reactance device 7 to move, the driving shaft 9 can be used as a hollow core rod and positioned in the reactors I71, II 74 and III 76 to further enhance the inductive reactance effect of the device, thereby improving the impedance effect of the device on the short circuit effect.

The using method of the invention is as follows:

the threaded pipe 8 is driven to rotate by controlling the rotation of the power machine 34, at the moment, the reactance device 7 has a movement trend along the vertical upward direction in fig. 2 under the elastic force of the spring 5, so that the threaded pipe 8 rotates until the threads on the outer surface are matched with the threads on the inner surface of the threaded sleeve 711, the reactance device 7 cannot rotate in the axial direction and the reactance device 7 moves along the vertical upward direction in fig. 2 under the screwing action of the threads, at the moment, the access bracket I72 firstly contacts with the contact bracket 73, so that the two sides of the reactor I71 are mutually communicated, namely, the reactor I71 is accessed into a circuit, at the moment, the inductive reactance coil 712 in the reactor I71 starts to function, and if the inductive reactance of the reactor I71 cannot meet the requirement of protecting short-circuit current in the existing circuit, the power machine 34 can continuously drive the threaded pipe 8 to rotate, the reactance device 7 is made to move in the vertical upward direction in fig. 2 again, the height of the top end of the contact support 73 is gradually higher than that of the elastic contactor 24 in the moving process, the elastic contactor 24 is made of elastic conductive materials, so that the elastic contactor 24 can be elastically deformed to keep a moving state with the contact support 73, when the reactance device 7 continues to rise, and the top end of the contact support 73 is too high to be continuously contacted with the elastic contactor 24, at this time, the elastic contactor 24 can be separated from the contact support 73 and quickly reset under the action of the self elastic force and is contacted with the contact support ii 75, the disconnection time in the contact replacing process of the elastic contactor 24 is shortened, the stability of the device is further improved, after the elastic contactor 24 is contacted with the contact support ii 75 again, at this time, the reactor ii 74 and the reactor i 71 are connected to a circuit together, therefore, the inductive reactance effect is improved, the driving shaft 9 can drive the threaded pipe 8 to rotate and drive the reactance device 7 to move, and meanwhile, the driving shaft 9 can be used as a hollow core rod and is positioned inside the reactor I71, the reactor II 74 and the reactor III 76 so as to enhance the inductive reactance effect of the device.

The modularized design among the I71, II 74 and III 76 reactors makes the coil that incorporates into the circuit distribute with the form in the segmentation, if too big and appear the phenomenon of fusing in the short circuit load, can change single module fast, compare in original integral design, this kind of design can avoid whole coil winding to be burnt and improve cost of maintenance, also can change the module that burns out fast simultaneously, required maintenance duration after having shortened the device and having broke down, production efficiency has been improved, in addition, the modularized design can have more actual demand and replace the quantity of module, thereby make the device's application scope further expand, the practicality that has improved the device.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A current-limiting reactor structure for limiting overcurrent of a power system comprises a base (1), and is characterized in that: the device comprises a base (1), a limiting device (2) is fixedly mounted at the top of the base (1) at the position outside the base, a power device (3) is fixedly mounted at the top of the limiting device (2), a supporting seat (4) is fixedly mounted at the position of the top of the base (1) at the center, the bottom of a spring (5) and the bottom of the spring (5) are fixedly connected with the top of the base (1) in a movable sleeve mode, a retainer (6) and the bottom of the retainer (6) are fixedly connected with the top of the spring (5) at the top of the supporting seat (4), the limiting device (2) comprises a shell (21), a guide rail frame (22) is fixedly mounted at one side of the outer surface of the shell (21), a strip-shaped hole and a contact support (73) and a contact support II (75) are formed in the bottom of the guide rail frame (22) and extend out of the strip-shaped hole, one side fixed mounting of guide rail frame (22) has installing support (23), one side fixed mounting of installing support (23) has elasticity contactor (24), spacing groove (25) have been seted up to the opposite side of shell (21) surface, the inside both sides fixed mounting of spacing groove (25) has limiting plate (26), the surface activity of holder (6) has cup jointed reactance device (7), reactance device (7) include reactor I (71), reactor I (71) include threaded sleeve (711), the inner wall surface of threaded sleeve (711) is provided with the screw thread and threaded sleeve (711) activity cup joints on the surface of holder (6), the surface fixation of threaded sleeve (711) has cup jointed inductance coil (712), the bottom regulation of threaded sleeve (711) is installed the bottom and reactor II (74) fixed connection of connecting pipe (713) and connecting pipe (713), the structure of the reactor I (71) is completely the same as that of the reactor II (74) and the reactor III (76), the reactor I (71), the reactor II (74) and the reactor III (76) are connected with each other through a contact support (73) and a contact support II (75) to form a whole, both sides of the whole formed by the reactor I (71), the reactor II (74) and the reactor III (76) are fixedly provided with an access support I (72) and a contact tail frame (77), the length of the top of the contact support (73) is greater than that of the bottom of the contact support (73), one side of the outer surface of the reactor I (71), which is close to the top, is fixedly provided with the access support I (72), the access support I (72) extends out of a gap between the limiting plates (26), and one side of the outer surface of the reactor I (71), which is close to the bottom, is fixedly provided with the contact support (73), the one end fixed mounting of contact support (73) has reactor II (74), one side fixed mounting that reactor II (74) surface is close to the bottom has contact support II (75), the one end fixed mounting of contact support II (75) has reactor III (76), one side fixed mounting that reactor III (76) surface is close to the bottom has contact tailstock (77), the top movable mounting of reactance device (7) has screwed pipe (8), the surface of screwed pipe (8) is provided with the screw thread of screw thread and this screw thread and screw sleeve (711) inner wall surface and cooperatees, the height and the connecting pipe (713) height of screwed pipe (8) are the same, the top and the power device (3) fixed socket joint of the top fixed mounting of screwed pipe (8) has driving shaft (9) and driving shaft (9).

2. A current-limiting reactor structure of a power system for limiting an overcurrent according to claim 1, characterized in that: the power device (3) comprises a top cover (31), the top cover (31) is fixedly arranged at the top of the limiting device (2), the top of the top cover (31) is fixedly provided with an annular seat (32), the top of the annular seat (32) is fixedly provided with a fixed sleeve (33), a power machine (34) is fixedly sleeved in the fixed sleeve (33), an output shaft of the power machine (34) penetrates through the annular seat (32) and the top cover (31) and extends to the inside of the limiting device (2), one end of the output shaft of the power machine (34) is fixedly provided with a driving block (35), a mounting sleeve (36) is fixedly mounted at the bottom of the top cover (31), a bearing (37) is movably sleeved in the mounting sleeve (36), the position of the outer surface of the driving shaft (9) close to the top is movably sleeved with the bearing (37), and the top of the driving shaft (9) is fixedly sleeved with the driving block (35).

3. A current-limiting reactor structure of a power system for limiting an overcurrent according to claim 1, characterized in that: the elastic contactor (24) is made of elastic conductive materials.