CN113410824B - High-voltage alternating-current rapid switch equipment - Google Patents

Abstract

The invention discloses high-voltage alternating-current rapid switching equipment which comprises two main switching devices which are connected in series, wherein each main switching device comprises a shell and a sleeve which are sequentially communicated from bottom to top along the vertical direction, a bottom cabinet is arranged below the shell, a vacuum arc-extinguishing chamber and a parallel voltage-sharing capacitor are arranged in the shell, a contact assembly capable of controlling the on-off of a main circuit is arranged in the vacuum arc-extinguishing chamber, a rapid switching assembly which is in linkage fit with the contact assembly is arranged in the bottom cabinet, and an inner conductor which sequentially penetrates through the sleeves and the shell from top to bottom and is matched with the contact assembly and the main circuit is also arranged in each main switching device; and a current transformer which is electrically connected with each inner conductor and can monitor the current of the main line is communicated between the two shells, and each sleeve, each shell and the current transformer are communicated with each other to form a through cavity filled with insulating gas. The high-voltage alternating-current rapid switch equipment can be suitable for a high-voltage power grid and has rapid on-off action capability.

Description

High-voltage alternating-current rapid switch equipment

Technical Field

The invention relates to the technical field of high-voltage alternating-current rapid switching equipment, in particular to high-voltage alternating-current rapid switching equipment.

Background

A fault current limiter is a device that limits the expected peak and/or effective value of the fault current in an ac circuit system to a desired value or below a desired value based on a change from a conducting mode to a current limiting mode due to an increase in its resistance and/or reactance.

With the rapid increase of the load of the power system and the continuous input of large-capacity units, the short-circuit current of the power grid of each voltage class continuously increases, and the safe operation of the power system is seriously threatened. In order to effectively reduce the short-circuit current in the power system, a practical and effective means is to use a fault current limiter (current limiting element) to limit and reduce the short-circuit current, and accordingly, the development and application of the current limiting element become a hot spot in the field of high-voltage electric devices.

The basic principle of the current limiting element in the high-voltage power grid is that a reactor is connected in series into a system or fault current is switched to a current limiting branch circuit where the reactor is located through the on-off of a mechanical switch, and short-circuit fault current is limited by the reactor. Although the core component of the current limiting element, which plays a role in limiting current, is the reactor, whether the reactor can be rapidly switched from the normal conduction mode to the current limiting mode when a short-circuit current occurs and the reactor can play a role in limiting the short-circuit current depends on the switching-off performance and the action reliability of the mechanical switch.

Therefore, how to provide a switchgear which can be applied to a high voltage network and has a fast on-off action capability is an important technical problem that needs to be solved by those skilled in the art at present.

Disclosure of Invention

The invention aims to provide a high-voltage alternating-current rapid switching device which can be suitable for a high-voltage power grid and has rapid on-off action capability.

In order to solve the technical problems, the invention provides high-voltage alternating-current rapid switch equipment which is communicated with a main line connected in parallel with a current-limiting element and comprises two main switch devices connected in series, wherein each main switch device comprises a bottom cabinet, a shell and a sleeve which are sequentially communicated from bottom to top along the vertical direction, a vacuum arc extinguish chamber and a parallel voltage-sharing capacitor are arranged in each shell, a contact assembly capable of controlling the on-off of the main line is arranged in each vacuum arc extinguish chamber, a rapid switch assembly in linkage fit with the contact assembly is arranged in each bottom cabinet, and an inner conductor which sequentially penetrates through the sleeve and the shell from top to bottom and is matched with the contact assembly and the main line is also arranged in each main switch device;

and current transformers which are electrically connected with the inner conductors and can monitor the current of the main line are communicated between the two shells, and the sleeves, the shells and the current transformers are communicated with one another to form a through cavity filled with insulating gas.

Preferably, a basin-type insulator is arranged between the sleeve and the shell.

Preferably, an insulating pull rod is connected between the contact assembly and the quick switch assembly.

Preferably, a support capable of supporting the contact assembly is arranged in the housing, and the support is made of an insulating material.

Preferably, the quick switch assembly comprises a connecting rod coaxially connected with the insulating pull rod, an upper frame, a separating brake coil, a repulsion disc, a closing coil and a lower frame are sequentially sleeved on the connecting rod from top to bottom along the axial direction of the connecting rod, an upper limiting part and a lower limiting part are sequentially arranged on the connecting rod from top to bottom along the axial direction of the connecting rod, the repulsion disc is located between the upper limiting part and the lower limiting part, a matching gap for the repulsion disc to reciprocate along the axial direction of the connecting rod is formed between the upper limiting part and the lower limiting part, the outer diameter of the upper limiting part is smaller than the inner diameter of the separating brake coil, and the outer diameter of the lower limiting part is smaller than the inner diameter of the closing coil.

Preferably, at least two steady-state maintaining mechanisms are symmetrically arranged on two sides of the connecting rod, each steady-state maintaining mechanism comprises a pull rod hinged to the side portion of the connecting rod in a linkage mode, one end of each pull rod is hinged to the connecting rod, and the other end of each pull rod is connected to the inner wall of the bottom cabinet through a limiting spring.

Preferably, the connecting rod is further sleeved with an upper spring and a lower spring, the upper spring is located between the upper frame and the upper limiting member, the outer diameter of the upper spring is not greater than the outer diameter of the upper limiting member, the lower spring is located between the lower limiting member and the lower frame, and the outer diameter of the lower spring is not greater than the outer diameter of the lower limiting member.

Preferably, the auxiliary switch device further comprises a plurality of auxiliary switch devices, each auxiliary switch device comprises an auxiliary bottom cabinet and an auxiliary outer shell which are arranged in an aligned mode from bottom to top along the vertical direction, an auxiliary vacuum arc-extinguishing chamber and an auxiliary parallel voltage-sharing capacitor are arranged in each auxiliary outer shell, an auxiliary contact assembly capable of controlling the on-off of a main circuit is arranged in each auxiliary vacuum arc-extinguishing chamber, an auxiliary quick switch assembly in linkage fit with the auxiliary contact assembly is arranged in each auxiliary bottom cabinet, and an auxiliary inner conductor sequentially penetrates through the auxiliary outer shells and the auxiliary bottom cabinets from top to bottom and is matched with the auxiliary contact assembly;

the auxiliary switch devices are connected in parallel or in series, and the auxiliary switch devices and the main switch devices are connected in parallel or in series.

Preferably, the insulating gas is sulfur hexafluoride gas.

Compared with the background technology, the high-voltage alternating-current rapid switch equipment provided by the invention forms a double-break series switch form through the series connection and matching of the two main switch devices in the operation and use process so as to meet the current limiting and stabilizing requirements of high-voltage lines under different working conditions. Specifically, the current state in the main line is monitored in real time through the current transformer, when the short-circuit current is too large, the contact assembly is rapidly disconnected through the rapid switch assembly, so that the current limiting element connected in parallel on the main line is rapidly connected into the power system, the current in the system is rapidly limited to a target value, and in the process, the high-voltage working condition adaptability of the high-voltage alternating-current rapid switch device can be remarkably improved through the mutual matching among the shell, the sleeve and the current transformer and the through cavity working condition environment filled with insulating gas, so that the operation requirement of rapid on-off current limiting in a high-voltage power grid system is met.

In another preferred embodiment of the present invention, a basin-type insulator is disposed between the bushing and the housing. This basin formula insulator can be separated the logical cavity structure that the packing that has insulating gas that communicates formation between sleeve pipe and shell is for a plurality of parts, so can apply different atmospheric pressure to the operating mode demand that the different cavities of isolating correspond to guarantee in the different cavities like the special demand of functional component such as vacuum interrupter to the atmospheric pressure environment, guarantee the whole high-efficient operation of equipment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic perspective view of a high-voltage ac fast switchgear with two main switching devices connected in series according to an embodiment of the present invention;

FIG. 2 is a cross-sectional structural elevation view of FIG. 1;

FIG. 3 is a schematic structural view of the fast switch assembly of FIG. 2;

fig. 4 is a schematic perspective view of a high-voltage ac fast switching apparatus in which two main switching devices and two auxiliary switching devices are sequentially connected in series according to an embodiment of the present invention;

FIG. 5 is a circuit diagram of FIG. 4;

fig. 6 is a schematic perspective view of a high-voltage ac fast switching apparatus with two main switching devices connected in series according to an embodiment of the present invention;

fig. 7 is a circuit diagram of fig. 6.

Wherein:

10-a main switching device;

101-a bottom cabinet;

102-a housing;

103-a cannula;

104-parallel voltage-sharing capacitor;

105-a contact assembly;

106-an inner conductor;

107-current transformer;

108-basin insulators;

109-a support;

110-a fast switching assembly;

11-a connecting rod;

111-vacuum arc-extinguishing chamber;

112-insulating tie rod;

121-an upper frame;

122-a lower frame;

131-a switching-off coil;

132-a closing coil;

14-repulsive force disk;

141-an upper stop;

142-a lower retainer;

143-fit clearance;

144-upper spring;

145-lower spring;

15-steady state holding mechanism;

151-a pull rod;

152-a limit spring;

153-inner wall;

20-an auxiliary switching device;

201-auxiliary bottom cabinet;

202-auxiliary housing.

Detailed Description

The core of the invention is to provide a high-voltage alternating-current rapid switching device which can be suitable for a high-voltage power grid and has rapid on-off action capability.

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 7, fig. 1 is a schematic perspective view of a high-voltage ac fast switching apparatus with two main switching devices connected in series according to an embodiment of the present invention; FIG. 2 is a cross-sectional structural elevation view of FIG. 1; FIG. 3 is a schematic structural view of the fast switch assembly of FIG. 2;

fig. 4 is a schematic perspective view of a high-voltage ac fast switching apparatus in which two main switching devices and two auxiliary switching devices are sequentially connected in series according to an embodiment of the present invention; FIG. 5 is a circuit diagram of FIG. 4; fig. 6 is a schematic perspective view of a high-voltage ac fast switching apparatus with two main switching devices connected in series according to an embodiment of the present invention; fig. 7 is a circuit diagram of fig. 6.

In a specific embodiment, the high-voltage alternating-current fast switching equipment provided by the invention is communicated with a main line connected in parallel with a current-limiting element, and comprises two main switching devices 10 connected in series, wherein each main switching device 10 comprises a shell 102 and a sleeve 103 which are sequentially communicated from bottom to top along the vertical direction, a bottom cabinet 101 is arranged below the shell 102, a vacuum arc-extinguishing chamber 111 and a parallel voltage-sharing capacitor 104 are arranged in the shell 102, a contact assembly 105 capable of controlling the on-off of the main line is arranged in the vacuum arc-extinguishing chamber 111, a fast switching assembly 110 in linkage fit with the contact assembly 105 is arranged in the bottom cabinet 101, and an inner conductor 106 which sequentially penetrates through the sleeve 103 and the shell 102 from top to bottom and is matched with the contact assembly 105 and the main line is also arranged in the main switching device 10; a current transformer 107 electrically connected to each inner conductor 106 and capable of monitoring a main line current is connected between the two housings 102, and each bushing 103, each housing 102, and the current transformer 107 are connected to each other to form a through cavity filled with an insulating gas.

In the operation and use process of the high-voltage alternating-current rapid switching equipment, a double-break series switch form is formed through the series connection and the matching between the two main switching devices 10 in the operation and use process, so that the current limiting and stabilizing requirements of high-voltage lines under different working conditions are met. Specifically, two adjacent inner conductors 106 can be connected in series through a conductor inside the current transformer 107, so that the two adjacent inner conductors 106 are connected in series to form a U-shaped conductive path, the current state in the main line is monitored in real time through the current transformer 107, when the short-circuit current is too large, the contact assembly 105 is quickly disconnected by using the quick switch assembly 110, so that the current limiting element connected in parallel to the main line is quickly connected into the power system, so that the current in the system is quickly limited to a target value, in the process, the high-voltage working condition adaptability of the high-voltage alternating-current quick switch device can be remarkably improved by combining a through cavity working condition environment filled with insulating gas through the mutual cooperation among the shell 102, the sleeve 103, the inner conductors 106 and the current transformer 107, and the operation requirement of quick on-off current limiting in a high-voltage power grid system can be met.

Further, a basin-type insulator 108 is disposed between the sleeve 103 and the housing 102. This basin formula insulator 108 can be separated the logical cavity structure that the packing that has insulating gas that forms between sleeve pipe 103 and shell 102 intercommunication is for a plurality of parts, so can apply different atmospheric pressure to the operating mode demand that the different cavities of isolating correspond to guarantee in the different cavities like the special demand of functional unit such as vacuum interrupter 111 to the atmospheric pressure environment, guarantee the whole high-efficient operation of equipment.

In addition, an insulating pull rod 112 is connected between the contact assembly 105 and the fast switch assembly 110, and a support member 109 capable of supporting the contact assembly 105 is disposed in the housing 102, wherein the support member 109 is made of an insulating material. The insulating pull rod 112 cooperates with the supporting member 109 made of an insulating material, so that not only can reliable connection and stable support between the contact assembly 105 and the relevant mating member be fully ensured, but also effective electrical insulation between the live-line element and the inner conductor and the bottom cabinet can be ensured, interference between the electromagnetic environment of the contact assembly 105 itself and other electromagnetic environments in the equipment can be effectively avoided, and the performance and operation effect of the contact assembly 105 itself can be ensured.

Please refer to fig. 3 for emphasis.

When the high-voltage alternating-current rapid switching equipment is in a closing state, the repulsive force disc 14 is always in a state that the top surface is attached to the opening coil 131 and the bottom surface is attached to the lower limiting part 142, and at the moment, the contact assembly 105 is also in a closing station;

if the high-voltage alternating-current quick switching equipment is operated from a current closing state to a closing state, the closing coil 131 is instantaneously powered on, and an eddy effect is formed in the repulsion plate 14, at the moment, electromagnetic repulsion is generated between the repulsion plate 14 and the closing coil 131, then the repulsion plate 14 starts to move downwards under the action of the electromagnetic repulsion, the connection rod 11 and the contact assembly 105 are driven to synchronously and quickly move downwards by virtue of the abutting matching structure between the repulsion plate 14 and the lower limiting piece 142 through the movement inertia caused by the electromagnetic repulsion until the bottom surface of the repulsion plate 14 abuts against the top surface of the closing coil 132, then under the influence of the inertia, the connection rod 11 and the contact assembly 105 continue to move downwards until the upper limiting piece 141 abuts against the top surface of the repulsion plate 14, at the moment, the contact assembly 105 reaches a closing station, and thus the high-voltage alternating-current quick switching equipment keeps the closing state;

if the high-voltage alternating-current quick switching equipment needs to be switched from the opening state to the closing state, only the closing coil 132 needs to be electrified instantaneously, an electromagnetic eddy effect is formed in the repulsion plate 14 at the moment, so that the repulsion plate 14 can be moved under the action of electromagnetic repulsion force formed between the repulsion plate 14 and the closing coil 132, the connecting rod 11 and the contact assembly 105 are driven to move upwards synchronously and quickly through the moving inertia of the repulsion plate by utilizing a butting structure between the upper limiting piece 141 and the repulsion plate 14 until the top surface of the repulsion plate 14 butts against the bottom surface of the opening coil 131, then the connecting rod 11 and the contact assembly 105 continue to move upwards under the action of inertia until the lower limiting piece 142 butts against the bottom surface of the repulsion plate 14, at the moment, the contact assembly 105 arrives at the closing station again, and thus the high-voltage alternating-current quick switching equipment keeps in the closing state.

It should be particularly noted that, in consideration of general working condition requirements, the fast switch assembly 110 only needs an electromagnetic induction repulsion force linkage mechanism formed by the connection rod 11, the repulsion force plate 14, the opening coil 131 and the closing coil 132 which are matched with each other, and can complete a basic fast switch control function, and other components can be flexibly adjusted and selected according to specific working condition requirements, and the basic linkage mechanism principle and the assembly functional effects are kept consistent.

Based on the working process, in the switching-on and switching-off operation process of the high-voltage alternating-current quick switching device, the matching gap 143 formed between the upper limiting piece 141 and the lower limiting piece 142 is utilized, so that after the connecting rod 11 and the contact assembly 105 synchronously move along with the repulsion plate 14, the connecting rod 11 and the contact assembly 105 can still continuously move for a certain distance under the inertia effect, therefore, the action stroke of the contact assembly 105 can be obviously improved on the premise of not changing the existing assembly space of the repulsion plate 14 and the connecting rod 11, and the effective stroke of the contact assembly 105 is larger than that of the repulsion plate 14, so that the opening distance of the high-voltage alternating-current quick switching device is greatly improved, and the working condition adaptability of the high-voltage alternating-current quick switching device to a high-voltage power system is greatly improved.

It should be noted that, as described above, the outer diameter of the upper limiting member 141 is smaller than the inner diameter of the opening coil 131, and the outer diameter of the lower limiting member 142 is smaller than the inner diameter of the closing coil 132, and the like, the relative sizes of the radial dimensions of the adapter members are set so as to ensure that the upper limiting member 141 can smoothly enter the coil gap inside the opening coil 131 and the lower limiting member 142 can smoothly enter the coil gap inside the closing coil 132 during the operation of the assembly, so as to further utilize the existing space of each coil, improve the overall structural space utilization rate of the high-voltage ac fast switching device, make the axial operation process of the connecting rod 11 smoother, more efficient and larger in amplitude, and fully ensure and moderately increase the effective stroke of the contact assembly 105. Of course, on the premise that the actuating space of the connecting rod 11, the contact assembly 105 and the associated mating parts is fully ensured, the relative relationship between the radial dimensions of the limiting members and the corresponding coils is not limited to the above, and in principle, the relative relationship may be any one that can meet the practical application requirements of the high-voltage ac fast switching equipment.

It should be noted that, in consideration of installation and use requirements under most working conditions, the whole high-voltage ac fast switchgear is vertically arranged, that is, the axis of the connecting rod 11 extends along the vertical direction, on this basis, the insulating pull rod 112 is located below the vacuum arc-extinguishing chamber 111, and the insulating pull rod 112 is located above the upper frame 121, so as to ensure the insulating isolation of the insulating pull rod 112 to different working areas and corresponding components of the high-voltage ac fast switchgear, so as to prevent electromagnetic interference from being generated between the repulsion acting component located below and the closing and opening acting components located above, and ensure the relative independence and stable operation of the two components.

Further, the high-voltage alternating-current fast switch equipment further comprises a steady-state retaining mechanism 15 matched with the connecting rod 11, the steady-state retaining mechanism 15 comprises a pull rod 151 arranged on the side portion of the connecting rod 11 in a linkage mode, one end of the pull rod 151 is hinged to the connecting rod 11, and the other end of the pull rod 151 is connected to a side portion supporting body 153 through a limiting spring 152. After the connecting rod 11 moves to the dead point position passing through the pull rod 151 along with the repulsion disk 14 synchronously, the pull rod 151 exerts a certain degree of thrust on the connecting rod 11 under the action of the reset force of the limiting spring 152, so that the connecting rod 11 can continue to move along the moving direction of the connecting rod 11, the actions of the connecting rod 11, the contact assembly 105 and the repulsion disk 14 are faster and more efficient, and the operating efficiency and the operating effect of the high-voltage alternating-current quick switching device are further improved.

Further, the number of the steady-state holding mechanisms 15 is at least two, and the two steady-state holding mechanisms 15 are symmetrically arranged on both sides of the connecting rod 11 in the horizontal direction. With two steady state retaining mechanisms 15 symmetrical arrangement in the both sides of connecting rod 11, can further optimize the power conduction effect between pull rod 151 and connecting rod 11, make the effort that connecting rod 11 received more balanced steady to guarantee that connecting rod 11 can steadily continue the motion under the effort influence of pull rod 151.

Specifically, the two steady-state maintaining mechanisms 15 are shown in the figures for illustration purposes, in practical applications, the number of the steady-state maintaining mechanisms 15 may also be 3, 4 or more, and a worker may flexibly select and adjust the steady-state maintaining mechanisms according to actual working condition requirements and specific assembly space, but it should be noted that each steady-state maintaining mechanism 15 should be uniformly distributed on the outer circumferential side of the connecting rod 11 along the circumferential direction at equal intervals by taking the axis of the connecting rod 11 as a reference, so as to ensure that the acting force of each pull rod 151 on the connecting rod 11 is more uniform and reliable, and optimize the stress distribution and the action effect of the connecting rod 11.

It should be noted that in practical applications, the side support 153 is generally a wall, and depending on specific working conditions, a side wall of an equipment rack or a special metal frame or other support may be selected, as long as it is capable of ensuring reliable fixing of the relevant components of the steady-state maintaining mechanism 15 and meeting practical working requirements of the high-voltage ac fast switching equipment in principle.

It should be further noted that the limiting spring 152 may also be replaced by an actuating device such as an air cylinder or an oil cylinder, which has a bidirectional actuating capability and can provide a reliable restoring force for the pull rod 151, and the operator may flexibly select the limiting spring according to the actual working condition and according to the specific requirements.

Further, the hinge point between the tie rod 151 and the connecting rod 11 is located between the upper frame 121 and the insulating tie rod 112 in the axial direction of the connecting rod 11. This arrangement enables the connection structure between the tie rod 151 and the connecting rod 11 to be arranged below the insulating tie rod 112, thereby avoiding structural interference and adverse effects of the operating components such as the tie rod 151 and the stopper spring 152 on the core components such as the contact assembly 105 and the vacuum interrupter 111.

Specifically, the connecting rod 11 is further sleeved with an upper spring 144 and a lower spring 145, the upper spring 144 is located between the upper frame 121 and the upper limiting member 141, an outer diameter of the upper spring 144 is not greater than an outer diameter of the upper limiting member 141, the lower spring 145 is located between the lower limiting member 142 and the lower frame 122, and an outer diameter of the lower spring 145 is not greater than an outer diameter of the lower limiting member 142. In the downward movement process of the connecting rod 11 and the linkage part thereof, after the repulsion plate 14 abuts against the closing coil 132, the connecting rod 11 continues to move, at the moment, the top end of the lower spring 145 abuts against the lower limiting part 142, along with the continuous downward movement of the connecting rod 11, the lower spring 145 is continuously compressed under the action of the lower limiting part 142, and meanwhile, an upward reaction force is applied to the lower limiting part 142, so that the downward movement speed of the connecting rod 11 can be reduced until the upper limiting part 141 abuts against the repulsion plate 14, and in the process, the lower spring 145 provides a reliable upward action force for the connecting rod 11 through the lower limiting part 142, so that the structural impact between the connecting rod 11 and the corresponding adapting part in the downward movement process of the connecting rod 11 and the related moving parts thereof and the corresponding adapting part is relieved, and the impact structural damage between the relatively moving parts is avoided; in the upward movement process of the connecting rod 11 and the linkage component thereof, the upper spring 144 can also correspondingly play a role in speed reduction and buffering, and in the specific matching process between the upper spring 144 and the upper limiting member 141, the matching process between the lower spring 145 and the lower limiting member 142 can be directly referred to, the moving directions of the connecting rod 11 and the lower spring are opposite, and the rest of the movement processes only need to be correspondingly reversed, which is not described herein.

Therefore, the upper spring 144 and the lower spring 145 can correspondingly relieve the structural impact of components in the switching-on process and the switching-off process, so that the connecting rod 11 and the moving contact can be ensured to smoothly complete the switching-off process or the final action stroke in the switching-on process, and the damage of the components caused by structural rigidity impact is avoided. In addition, in the actual operation process of the repulsion disk 14 and the connecting rod 11, the upper spring 144/the lower spring 145 may contact with the upper stopper 141/the lower stopper 142 before the repulsion disk 14 contacts with the opening coil 131/the closing coil 132, and gradually compress the upper spring 144/the lower spring 145, so that there may be a situation that the upper spring 144/the lower spring 145 is already compressed to a limit position before the repulsion disk 14 contacts with the opening coil 131/the closing coil 132, and thus the repulsion disk 14 may complete the reliable and accurate operation of the movable contact without contacting with the opening coil 131/the closing coil 132, and the corresponding opening and closing operations of the high voltage ac fast switchgear are realized. Of course, the above-mentioned component adapting structure and the operation process thereof are only used for illustration, and the practical application should be subject to the requirement of ensuring the practical application of the high-voltage ac fast switching equipment.

More specifically, the top end of the upper spring 144 is fixedly coupled to the inner wall of the upper frame 121, and the bottom end of the lower spring 145 is fixedly coupled to the inner wall of the lower frame 122. The end fixing structure can connect the upper spring 144 and the lower spring 145 to the upper frame 121 and the lower frame 122 respectively, so as to prevent the upper spring 144 and the lower spring 145 from loosening or misplacing during the action of the assembly, and ensure the position stability and the buffering effect during the telescopic action.

Further, the repulsive force plate 14 is an aluminum alloy member. Of course, in consideration of the actual effect of the eddy current effect, the repulsive disc 14 may also be made of other metal or other conductive material capable of forming the electromagnetic eddy current effect, and the operator may flexibly adjust the repulsive disc according to the working condition, in principle, any repulsive disc may be used as long as it can meet the actual application requirement of the high-voltage ac fast switchgear.

In addition, the upper stopper 141 and the lower stopper 142 are both annular bosses. The annular boss is simple and reliable in structure, good in structure adaptation effect with the connecting rod 11, the repulsive force disc 14 and even between the upper spring 144 and the lower spring 145, uniform and reliable in stress distribution, and capable of further optimizing the abutting and linkage matching effect with relevant matching pieces.

Of course, the upper limiting member 141 and the lower limiting member 142 are both annular bosses and are only preferable schemes under normal working conditions, and in consideration of actual processing difficulty and working condition requirements, a local protrusion or other boss structure can be adopted as a specific structural form of the upper limiting member 141 and the lower limiting member 142, and in principle, the actual assembly and working requirements of the high-voltage alternating-current rapid switching device can be met.

Please refer to fig. 4 to fig. 7.

In practical application, a plurality of auxiliary switch devices 20 can be further arranged, each auxiliary switch device 20 comprises an auxiliary bottom cabinet 201 and an auxiliary outer shell 202 which are arranged from bottom to top in a contraposition mode along the vertical direction, an auxiliary vacuum arc-extinguishing chamber and an auxiliary parallel voltage-sharing capacitor are arranged in each auxiliary outer shell, an auxiliary contact assembly 105 capable of controlling the on-off of a main circuit is arranged in each auxiliary vacuum arc-extinguishing chamber, an auxiliary quick switch assembly in linkage fit with the auxiliary contact assembly 105 is arranged in each auxiliary bottom cabinet 201, and an auxiliary inner conductor which sequentially penetrates through the auxiliary outer shell 202 and the auxiliary bottom cabinet 201 from top to bottom and is matched with the auxiliary contact assembly 105 is further arranged in each auxiliary switch device. In fact, during the specific assembly operation, the above-mentioned auxiliary bottom cabinet 201, auxiliary housing 202, auxiliary vacuum arc-extinguishing chamber, auxiliary parallel voltage-sharing capacitor, auxiliary contact assembly 105 and auxiliary fast switch assembly are all basically the same as the structures of the above-mentioned bottom cabinet 101, housing 102, vacuum arc-extinguishing chamber 111, parallel voltage-sharing capacitor 104, contact assembly 105 and fast switch assembly 110, and the functions and related adaptation effects are also completely the same, so that the assembly layout of the high-voltage ac fast switch device can be more regular, and the flexible splicing and combination under different working conditions can be facilitated.

On this basis, for different working conditions, on the basis that the two main switching devices 10 are connected in series, each auxiliary switching device 20 and each main switching device 10 may be connected in series or in parallel, and as shown in fig. 4 to 7, the assembly form of the two auxiliary switching devices 20 and the two main switching devices 10 is only for illustration, and the number and the arrangement positions of the auxiliary switching devices 20 in practical application may also be flexibly adjusted and selected according to the practical working conditions, and in principle, any auxiliary switching device may be used as long as it can meet the practical application requirements of the high-voltage ac fast switching equipment.

In summary, in the operation and use processes of the high-voltage alternating-current rapid switching equipment provided by the invention, a double-break series switch form is formed through series connection cooperation between the two main switching devices, so that the current limiting and stabilizing requirements of high-voltage lines under different working conditions are met. Specifically, the current state in the main line is monitored in real time through the current transformer, when the short-circuit current is too large, the contact assembly is rapidly disconnected through the rapid switch assembly, so that the current limiting element connected in parallel on the main line is rapidly connected into the power system, the current in the system is rapidly limited to a target value, and in the process, the high-voltage working condition adaptability of the high-voltage alternating-current rapid switch device can be remarkably improved through the mutual matching among the shell, the sleeve and the current transformer and the through cavity working condition environment filled with insulating gas, so that the operation requirement of rapid on-off current limiting in a high-voltage power grid system is met.

The high voltage ac fast switching device provided by the present invention is described in detail above. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (7)

1. A high-voltage alternating-current fast switch device is communicated with a main line connected with a current limiting element in parallel, and is characterized in that: the high-speed switch comprises two main switch devices which are connected in series, wherein each main switch device comprises a shell and a sleeve which are sequentially communicated from bottom to top along the vertical direction, a bottom cabinet is arranged below the shell, a vacuum arc extinguish chamber and a parallel voltage-sharing capacitor are arranged in the shell, a contact assembly capable of controlling the on-off of a main circuit is arranged in the vacuum arc extinguish chamber, a quick switch assembly which is in linkage fit with the contact assembly is arranged in the bottom cabinet, and an inner conductor which sequentially penetrates through the sleeves and the shell from top to bottom and is matched with the contact assembly and the main circuit is also arranged in the main switch device;

a current transformer which is electrically connected with each inner conductor and can monitor the current of a main line is communicated between the two shells, and each sleeve, each shell and the current transformer are communicated with each other to form a through cavity filled with insulating gas;

the contact subassembly with be connected with insulating pull rod between the quick-operation switch subassembly, the quick-operation switch subassembly includes the connecting rod with insulating pull rod coaxial coupling, it is equipped with frame, separating brake coil, repulsion dish, closing coil, underframe to overlap in proper order along its axial top-down on the connecting rod, still be provided with on the connecting rod along its axial top-down upper limit piece and lower limit piece of arranging in order, the repulsion dish is located go up the limit piece with between the lower limit piece, just go up the limit piece with form the confession between the lower limit piece the repulsion dish is followed the axial reciprocating motion's of connecting rod fit gap, go up the external diameter of limit piece and be less than the internal diameter of separating brake coil, the external diameter of lower limit piece is less than the internal diameter of closing coil.

2. A high voltage ac fast switching apparatus as claimed in claim 1, wherein: and a basin-type insulator is arranged between the sleeve and the shell.

3. A high voltage ac fast switching apparatus as claimed in claim 1, wherein: and a supporting piece capable of supporting the contact assembly is arranged in the shell and is made of an insulating material.

4. A high voltage ac fast switching apparatus as claimed in claim 1, wherein: at least two steady-state maintaining mechanisms are symmetrically arranged on two sides of the connecting rod and comprise pull rods hinged to the side portions of the connecting rod in a linkage mode, one ends of the pull rods are hinged to the connecting rod, and the other ends of the pull rods are connected to the inner wall of the bottom cabinet through limiting springs.

5. A high voltage ac fast switching apparatus as claimed in claim 1, wherein: the connecting rod is further sleeved with an upper spring and a lower spring, the upper spring is located between the upper frame and the upper limiting piece, the outer diameter of the upper spring is not larger than that of the upper limiting piece, the lower spring is located between the lower limiting piece and the lower frame, and the outer diameter of the lower spring is not larger than that of the lower limiting piece.

6. A high voltage ac fast switching apparatus as claimed in claim 1, wherein: the auxiliary switch device comprises an auxiliary bottom cabinet and an auxiliary shell which are arranged from bottom to top in a contraposition mode along the vertical direction, an auxiliary vacuum arc-extinguishing chamber and an auxiliary parallel voltage-sharing capacitor are arranged in the auxiliary shell, an auxiliary contact assembly capable of controlling the on-off of a main circuit is arranged in the auxiliary vacuum arc-extinguishing chamber, an auxiliary quick switch assembly in linkage fit with the auxiliary contact assembly is arranged in the auxiliary bottom cabinet, and an auxiliary inner conductor sequentially penetrates through the auxiliary shell and the auxiliary bottom cabinet from top to bottom and is matched with the auxiliary contact assembly;

the auxiliary switch devices are connected in parallel or in series, and the auxiliary switch devices and the main switch devices are connected in parallel or in series.

7. High voltage ac fast switching device according to claim 1, characterized in that: the insulating gas is sulfur hexafluoride gas.

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