CN117153618B - Device for limiting switching-off rebound of high-voltage vacuum switch, high-voltage vacuum switch and switching-off method thereof - Google Patents
Device for limiting switching-off rebound of high-voltage vacuum switch, high-voltage vacuum switch and switching-off method thereof Download PDFInfo
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- CN117153618B CN117153618B CN202311188230.0A CN202311188230A CN117153618B CN 117153618 B CN117153618 B CN 117153618B CN 202311188230 A CN202311188230 A CN 202311188230A CN 117153618 B CN117153618 B CN 117153618B
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- 238000005452 bending Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
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- 230000035939 shock Effects 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
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Abstract
The invention belongs to the technical field of high-voltage switches, and relates to a device for limiting the rebound of a high-voltage vacuum switch opening, which is added with a device for limiting the rebound of the opening and a switch limiting pin on the basis of the original vacuum switch, wherein the device for limiting the rebound of the opening and the switch comprises a bracket, a limiting piece connecting piece, a reset spring and a buffer; the limiting piece comprises a limiting piece body, a limiting piece connecting arm and a limiting hook, and when the limiting piece is at a third holding position, the limiting piece hook is used for hooking the switch limiting pin, so that the function of limiting the switching-off rebound of the high-voltage vacuum switch is realized; the limiting piece is restored to the second holding position from the third holding position by using the reset spring, so that the closing action of the high-voltage vacuum switch is not influenced; the resistance is large in the resetting process, so that the reliability of the limiting function is ensured; when the limiting piece is at the third holding position, the second positioning surface of the limiting piece is attached to the positioning surface of the support, the limiting piece blocks the movement of the limiting pin of the switch, the rebound of the switching-off of the high-voltage vacuum switch can be limited, the self-holding function is achieved, and the reliability of limiting is guaranteed.
Description
Technical Field
The invention belongs to the field of high-voltage switch operation, and particularly relates to a device for limiting switching-off rebound of a high-voltage vacuum switch, the high-voltage vacuum switch and a switching-off method thereof.
Background
The switches used in ac 3kV and above power systems are called high voltage switches, which are the most important control and protection devices in power systems. The high voltage switch can be used for switching on, off and carrying normal current of the running line, and carrying, off and switching abnormal current such as overload current and short circuit current in a specified time. At present, high-voltage switches are commonly classified into a high-voltage SF 6 switch and a high-voltage vacuum switch according to an arc extinguishing principle. However, sulfur hexafluoride gas has been used as a strong greenhouse gas, and the use of this gas has been clearly restricted by the protocols of Kyoto and Paris. The high-voltage vacuum switch adopts the vacuum arc-extinguishing chamber as an opening unit and is matched with a mechanism to complete mechanical operation, and the high-voltage vacuum switch has the advantages of environmental friendliness, long electric life, suitability for frequent operation, low cost in the whole life cycle and the like, and is more commonly applied to power grids.
The high-voltage vacuum switch mainly comprises a vacuum arc-extinguishing chamber, an operating mechanism (a permanent magnet, a spring or an electromagnetic repulsion mechanism and the like) and a bracket, wherein the vacuum arc-extinguishing chamber is used as a main switching-off element, and the operating mechanism is connected with a conducting rod at the movable end of the vacuum arc-extinguishing chamber through an insulating pull rod to realize a switching-on and switching-off function. Before the high-voltage vacuum switch is opened, the moving contact is positioned at a closing position, after an opening command is sent, the operating mechanism acts, the moving contact of the vacuum arc-extinguishing chamber moves from the closing position to the direction of separating the contacts, the opening speed is continuously increased from zero, and after the moving and the moving contacts travel over the stroke, the moving and the moving contacts are separated instantaneously to reach the just-opened speed; and then the speed continues to be increased until the maximum opening speed is reached, and after the maximum opening speed is reached, the opening buffer acts, so that the speed of the moving contact is rapidly reduced, and the moving contact stops at the final opening position. Since the kinetic energy of the moving part is not completely consumed when the moving contact reaches the opening position, the redundant energy is consumed on the component in a shock vibration mode, and opening rebound is formed. Because of the rebound of the breaking brake, the opening distance between the movable contact and the fixed contact is reduced, and the vacuum arc extinguishing chamber is easy to break down again in the breaking process, so that breaking failure is caused. Especially, when the high-voltage vacuum switch is used for switching a capacitor, the switch-off rebound and the switch-off sensitivity are high, because the switch-off speed is high and the switch-off rebound is easy to occur, the effective switch-off distance of two contacts is obviously reduced, and the recovery voltage between the breaks is high when the capacitor bank is switched, so that the high-voltage vacuum switch is extremely easy to break down again.
The buffer device is additionally arranged to prevent the brake release from rebounding, and the buffer provides smaller counter force at the moment that the moving part contacts the buffer device, so that the buffer property becomes steeper rapidly along with the increase of the buffer stroke, the brake release energy is absorbed as much as possible, and the purpose of limiting the brake release rebounding is achieved. At present, the buffer device adopted by the high-voltage vacuum switch is mainly an oil buffer or a buffer rubber plate. The design and the motion quality of the oil buffer, the brake separating spring, the brake separating speed and other relations are tightly connected, the reasonable design and adjustment of the oil buffer are required to be accumulated and completed through a large number of test verification, the viscosity and other performances of the buffer oil are more closely influenced along with the temperature of the running environment, the buffering performance of the oil buffer is greatly reduced in winter or severe cold weather, and the adoption of the oil buffer as a device for limiting the brake separating rebound is not very reliable. The buffer rubber plate is used for buffering, the effect of reducing the rebound of the opening of the high-voltage vacuum switch is not good, and the rubber plate is easy to age.
Disclosure of Invention
The invention aims to provide a high-voltage vacuum switch breaking rebound device, a high-voltage vacuum switch and a breaking method thereof, which solve the problems that the existing breaking rebound is unreliable or a rubber plate is easy to age due to the addition of a buffer device.
The invention is realized by the following technical scheme:
the invention also discloses a device for limiting the rebound of the opening of the high-voltage vacuum switch, which comprises a device for limiting the rebound of the opening and a switch limiting pin; the switch limiting pin is connected to the lower side of the high-voltage vacuum switch;
the limiting opening rebound device comprises a bracket, a limiting piece connecting piece, a reset spring and a buffer;
the limiting piece is rotationally connected to the bracket and fixedly connected with the limiting piece connecting piece;
The bottom end of the buffer is rotationally connected with the support, the top end of the buffer is rotationally connected with the limiting piece connecting piece, and the reset spring is sleeved on the buffer;
The limiting piece comprises a limiting piece body, a limiting piece connecting arm and a limiting hook which are connected into a whole, and the limiting piece connecting arm and the limiting hook are connected to the upper side of the limiting piece body;
the lower surface of the limiting part body is an arc surface and comprises a first positioning surface and a second positioning surface;
a bracket locating surface which is attached to the lower surface of the limiting piece is prefabricated on the bracket;
when the vacuum switch is positioned at the closing position, the first positioning surface of the limiting piece is attached to the positioning surface of the bracket, and the limiting piece is positioned at the first holding position;
When the vacuum switch is positioned at the opening position, the limiting piece is positioned at a second holding position;
When the vacuum switch is in a limiting state, the second positioning surface of the limiting piece is attached to the positioning surface of the support, the limiting piece is in a third holding position, and the limiting piece can block the movement of the limiting pin of the switch and is used for limiting the rebound of the opening of the high-voltage vacuum switch.
Further, the bracket comprises a bottom plate and two support plates vertically connected to the bottom plate, guide grooves are formed in the two support plates, the guide grooves are used for accommodating switch limiting pins, and limiting pieces are placed in the two support plates and hinged with the support plates through the limiting piece pins;
The upper surface of one side of the bottom plate is connected with a buffer supporting plate, a buffer supporting hole is formed in the buffer supporting plate, a buffer pin is arranged in the buffer supporting hole, and the buffer pin is rotationally connected with the buffer.
Further, the lower surface of the limiting hook and the upper surface of the limiting part body form a limiting cavity with the limiting part connecting arm;
the limiting piece body is connected with the bracket through a limiting piece pin.
Further, a limiting piece mounting hole is formed in the limiting piece body, and a limiting piece pin penetrates through the limiting piece mounting hole.
Further, the buffer comprises a cylinder body, a push rod and a connecting block which are sequentially connected;
the connecting block is rotationally connected with a first buffer pin, and the first buffer pin is connected with the limiting piece connecting piece;
The cylinder body is connected with a second buffer pin in a rotating mode, and the second buffer pin is connected to the bracket.
Further, the cylinder body lower extreme is opened there is the fixed orifices, opens there is the connecting hole on the connecting block, and first buffer round pin is installed in the connecting hole, and the second buffer round pin is installed in the fixed orifices.
Further, the switch limiting pin is connected to the lower side of the high-voltage vacuum switch through a limiting pin clamping fork.
Further, the limiting piece connecting piece is a bending plate and comprises a first plate body, a second plate body and a third plate body which are sequentially connected;
the first plate body is connected with the limiting part body, and the third plate body is hinged with the buffer.
The invention also discloses a high-voltage vacuum switch comprising the high-voltage vacuum switch breaking rebound limiting device.
The invention also discloses a brake separating method of the high-voltage vacuum switch, when the high-voltage vacuum switch is in a closing state and is ready for brake separating action, the limiting piece is positioned at the first holding position and starts brake separating, the switch limiting pin moves downwards, the switch limiting pin collides with the limiting piece, so that the limiting piece rotates to the second holding position first until reaching the limiting state, and the limiting piece rotates to the third holding position;
Under the action of the buffer, the limiting piece is temporarily positioned at a third holding position, when the high-voltage vacuum switch generates a rebound phenomenon, the switch limiting pin is hooked by the limiting hook at the upper part of the limiting piece, the rebound of the vacuum switch is limited, the switch limiting pin and the limiting piece have a self-holding function after being hooked, if the switch limiting pin continues to move upwards at the moment, the mutual matching of the switch limiting pin and the limiting piece can enable the limiting piece to rotate clockwise, the limiting hook hooks the switch limiting pin more firmly, and the limiting piece is ensured to be kept at the third holding position in the rebound process of the vacuum switch;
and then, the switch limiting pin moves downwards, the lower surfaces of the switch limiting pin and the limiting hook are separated, and the limiting piece is restored to the second holding position under the action of the reset spring and the buffer, so that the brake separating process is completed.
Compared with the prior art, the invention has the following beneficial technical effects:
The invention discloses a switching-off rebound device for limiting a high-voltage vacuum switch, which is characterized in that a switching-off rebound device and a switch limiting pin are additionally arranged on the basis of the original vacuum switch, and the switch limiting pin is connected to the lower side of the high-voltage vacuum switch; the limiting opening rebound device comprises a bracket, a limiting piece connecting piece, a reset spring and a buffer; the limiting piece comprises a limiting piece body, a limiting piece connecting arm and a limiting hook which are connected into a whole, and when the limiting piece is at a third holding position, the limiting piece hook is used for hooking the switch limiting pin, so that the function of limiting the switching-off rebound of the high-voltage vacuum switch is realized; the limiting piece is restored to the second holding position from the third holding position by using the reset spring, so that the closing action of the high-voltage vacuum switch is not influenced; the reset process of the reset spring is controlled by a buffer, and the buffer is specially designed so that the buffer resistance is small in the brake separating process, and smooth brake separation is ensured; the resistance is large in the resetting process, so that the reliability of the limiting function is ensured; the special design of the limiting piece of the device can enable the second positioning surface of the limiting piece to be attached to the positioning surface of the support when the limiting piece is at the third holding position, the limiting piece can block the movement of the limiting pin of the switch, the rebound of the switching-off of the high-voltage vacuum switch can be limited, the self-holding function is achieved, and the reliability of limiting is guaranteed.
The rebound phenomenon in the switching-off process of the switch is limited under the condition that the normal function of the high-voltage vacuum switch is not affected, the reset time after the switching-off rebound limit is ensured to be smaller than the clearance time of the reclosing action by 0.3s, and the normal reclosing action of the high-voltage vacuum switch is ensured. The device can obviously limit the rebound amplitude of the opening and ensure that the high-voltage vacuum switch keeps enough opening distance in the opening and closing process, the phenomenon of heavy impact breakdown caused by the reduction of the opening distance is avoided, and the stability and the reliability of the opening and closing short-circuit current of the high-voltage vacuum switch are ensured. The device has the advantages of few parts, simple structure, small occupied area, low cost and good economic efficiency, and can be installed only by utilizing two pin holes on the bracket.
Drawings
Fig. 1 is a schematic structural diagram of a device for limiting the switching-off rebound of a high-voltage vacuum switch according to the present invention, wherein the device is in an initial state (a limiting member is in a first holding position), and the state is generally matched with a switching-on position of the high-voltage vacuum switch;
FIG. 2 is a schematic view of the device of FIG. 1 in an intermediate state after the device is switched to a closed-allowing state (the limiting member is in the second holding position), which is generally engaged with the opening position of the high-voltage vacuum switch;
FIG. 3 is a schematic view of the device shown in FIG. 2 in a state of being further switched to a maximum switching position, wherein the device is in a limit state (the limit member is in a third holding position) and the device can limit the switching-off rebound amplitude of the high-voltage vacuum switch, and the state is generally matched with the position of the maximum rebound amplitude under the limit condition of the high-voltage vacuum switch;
FIG. 4 is a schematic diagram of an embodiment of the apparatus of the present invention applied to a high voltage vacuum switch;
FIG. 5 is a schematic view of the structure of a parts carrier inside the device of the present invention;
FIG. 6 is a schematic view of the structure of a part limiter inside the device of the present invention;
FIG. 7 is a schematic diagram of the structure of the buffer in a pulled-out state;
FIG. 8 is a schematic diagram of a structure of a buffer in a pressed-in state;
fig. 9 to 13: the device is matched with the switch limiting pin to realize a state change schematic diagram of time sequence in the high-voltage vacuum switch breaking rebound process;
FIG. 9 is a schematic view of the state of the device and switch stop pin when the vacuum switch is in the closed position;
FIG. 10 is a schematic view of the state of the switch limiting pin just contacting the device internal part limiting member during the vacuum switch opening process;
FIG. 11 is a schematic diagram showing the overshoot condition after the switch limiting pin collides with the device internal part limiting member during the opening process of the vacuum switch;
FIG. 12 is a schematic view of the device and the switch limiting pin reaching a limiting state during the opening process of the vacuum switch;
Fig. 13 is a schematic view showing the state of the device and the switch limiting pin when the vacuum switch is in the opening position.
Wherein, 1, limit the rebound device of separating brake; 2. a switch limit pin; 3. limiting pin clamping forks; 4. a mechanism and a transmission part; 5. an insulating pull rod; 6. a vacuum arc extinguishing chamber; 10. a conventional vacuum switch;
11. A bracket; 12. a limiting piece pin; 13. a limiting piece; 14. a limiting piece connecting piece; 15. a first bumper pin; 16. a return spring; 17. a buffer; 18. a second bumper pin;
111. A bottom plate; 111a, bracket mounting holes; 112. a bracket positioning surface; 113. a first support plate; 113a, a first support hole; 113b, a first guide groove; 114. a second support plate; 114a, a second support hole; 114b, a second guide groove; 115. a first buffer support plate; 115a, first bumper support holes; 116. a second buffer support plate; 116a, second bumper support holes;
131. a limiting part body; 131a, a first positioning surface; 131b, a second positioning surface; 131c, a limiting piece mounting hole; 131d, the upper surface of the limiting part body; 132. a limiting piece connecting arm; 132a, the inner side of the connecting arm of the limiting piece; 133. limiting hooks; 133a, the lower surface of the limiting hook; 134. a limiting cavity;
171. a connecting block; 171a, connection holes; 172. a cylinder; 172a, fixing holes;
L1-L2 respectively correspond to the distance between the connecting hole and the fixing hole when the buffer is in a pulled-out state and the buffer is in a pressed-in state;
D1 to D5 correspond to the distances between the bottom surface position and the axial center position of the switch stopper pin in the device of the present invention shown in fig. 9 to 13, respectively.
Detailed Description
The objects, technical solutions and advantages of the present invention will be more apparent from the following detailed description with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention.
The components illustrated in the figures and described and shown in the embodiments of the invention may be arranged and designed in a wide variety of different configurations, and thus the detailed description of the embodiments of the invention provided in the figures below is not intended to limit the scope of the invention as claimed, but is merely representative of selected ones of the embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention, based on the figures and embodiments of the present invention.
It should be noted that: the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, element, 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, element, method, article, or apparatus.
The features and properties of the present invention are described in further detail below with reference to examples.
As shown in fig. 1, the device for limiting the switching-off rebound of the high-voltage vacuum switch comprises a bracket 11, a limiting piece 13, a limiting piece connecting piece 14, a return spring 16 and a buffer 17.
The limiting piece 13 is hinged with the bracket 11 through the limiting piece pin 12, the limiting piece connecting piece 14 is fixedly connected to one side of the limiting piece 13, the limiting piece connecting piece 14 is connected with the buffer 17 through the first buffer pin 15, one end of the buffer 17 is connected with the limiting piece connecting piece 14 through the first buffer pin 15, the other end of the buffer 17 is connected with the bracket 11 through the second buffer pin 18, the buffer 17 is provided with the reset spring 16, and all parts connected through the pins can rotate around the axis of each pin.
As shown in fig. 1 to 3, the switching-off rebound device for limiting the high-voltage vacuum switch has three states in total, wherein the three states respectively comprise an initial state shown in fig. 1, and a limiting piece 13 in the device is positioned at a first holding position and corresponds to a switching-on position of the vacuum switch; in the intermediate state shown in fig. 2, the limiting member 13 in the device is in the second holding position, and the device is in the state of allowing closing, and the state corresponds to the opening position of the vacuum switch; in the limit state shown in fig. 3, the limit element 13 of the device is in the third holding position, which corresponds to the position of maximum rebound amplitude of the vacuum switch.
As shown in fig. 4, a device for limiting the switching-off rebound of a high-voltage switch according to the present invention is connected to a stopper pin fork 3 provided in a conventional vacuum switch 10 through a switch stopper pin 2, and the conventional vacuum switch 10 includes a vacuum interrupter 6, an insulating rod 5, and a mechanism and transmission part 4.
As shown in fig. 1, the device is in an initial state, at this time, the vacuum switch is in a closing position, the limiting piece 13 in the first holding position does not block the downward movement of the switch limiting pin 2, and the vacuum switch can be normally opened.
As shown in fig. 2, the device is in an intermediate state, at this time, the vacuum switch is in the opening position, the limiting piece 13 in the second holding position does not block the upward movement of the switch limiting pin 2, and the vacuum switch can be normally closed.
As shown in fig. 3, the device is in a limiting state, and the limiting piece 13 in the third holding position blocks the movement of the switch limiting pin 2 to limit the maximum rebound amplitude of the vacuum switch, so as to complete the function of limiting the switching-off rebound of the high-voltage vacuum switch.
As shown in fig. 5, the structure of the part bracket 11 in the device for limiting the rebound of the opening of the high-voltage switch of the present invention is specifically as follows: the part bracket 11 comprises a bottom plate 111, a first supporting plate 113 and a second supporting plate 114 which are vertically connected to the bottom plate 111, a first guide groove 113b is formed in the first supporting plate 113, a second guide groove 114b is formed in the second supporting plate 114, a switch limiting pin 2 is contained in the guide groove, and a limiting piece 13 is placed in the two supporting plates and hinged with the supporting plates through a limiting piece pin 12; the base plate 111 is prefabricated with bracket mounting holes 111a, and the base plate 111 is connected with the frame of the vacuum switch 10 through the bracket mounting holes 111 a.
Specifically, the first support plate 113 is provided with a first support hole 113a, the second support plate 114 is provided with a second support hole 114a, the stopper pin 12 penetrates through the first support hole 113a and the second support hole 114a, and the switch stopper pin 2 moves in the first guide groove 113b and the second guide groove 114 b.
A first bumper support plate 115 and a second bumper support plate 116 are coupled to an upper surface of one side of the base plate 111, the first bumper support plate 115 is provided with a first bumper support hole 115a, the second bumper support plate 116 is provided with a second bumper support hole 116a, and the second bumper pin 18 is installed in the first bumper support hole 115a and the second bumper support hole 116 a.
The lower ends of the first support plate 113 and the second support plate 114 are positioned on the support positioning surface 112.
As shown in fig. 6, a specific structure of a part limiting piece 13 in the high-voltage vacuum switch breaking rebound device is as follows: the limiting member 13 comprises a limiting member body 131, a limiting member connecting arm 132 and a limiting hook 133 which are connected into a whole, wherein the limiting member connecting arm 132 and the limiting hook 133 are connected to the upper side of the limiting member body 131, and a limiting cavity 134 is formed by the lower surface 133a of the limiting hook, the upper surface 131d of the limiting member body and the limiting member connecting arm 132.
A limiting piece mounting hole 131c is formed in the limiting piece body 131, a limiting piece pin 12 is mounted through the limiting piece mounting hole 131c, and the limiting piece 13 is connected with the bracket 11 through the limiting piece pin 12;
The lower surface of the limiting member body 131 is an arc surface, and includes a first positioning surface 131a and a second positioning surface 131b.
The limiting piece connecting piece 14 is a bending plate and comprises a first plate body, a second plate body and a third plate body which are sequentially connected, wherein the first plate body is connected with the limiting piece body 131, and the third plate body is hinged with the buffer 17. As shown in fig. 12, when the vacuum switch is in the limit state, the first plate is in the vertical state, the second plate is in the inclined state, the third plate is in the horizontal state, and the third plate is in the vertical state with the buffer 17.
In the switch-off process, as shown in fig. 10, the switch limiting pin 2 collides with the upper surface 131d of the limiting member body 131, so that the limiting member 13 rotates around the limiting member mounting hole 131c until the second positioning surface 131b and the bracket positioning surface 112 are completely attached, and the limiting member 13 is in the third holding position (see fig. 3 and 12), thereby completing the limiting function. At this time, the excessive energy of the moving part of the vacuum switch is not completely consumed, the switch limiting pin 2 may rebound after moving downwards to the maximum overshoot position, the switch limiting pin 2 is turned to move upwards, the lower surface 133a of the limiting hook is collided until the excessive energy is completely consumed, the vacuum switch is stabilized to the opening position under the action of the opening spring, and the limiting piece 13 rotates around the limiting piece mounting hole 131c under the action of the return spring 16 until the limiting piece 13 is located at the second holding position, and at this time, the upper surface 131d of the limiting piece body is tangent to the switch limiting pin 2 (as shown in fig. 13).
In the switching-on and switching-off process, the switch limiting pin 2 moves upwards away from the upper surface 131d of the limiting member body, and under the action of the pressure of the switch limiting pin 2, the limiting member 13 rotates around the limiting member mounting hole 131c under the action of the return spring 16 and the buffer 17 until the first positioning surface 131a and the bracket positioning surface 112 are completely attached, and the limiting member 13 is restored to the first holding position from the second holding position (as shown in fig. 1 and 9).
As shown in fig. 7 to 8, a specific structure of a part buffer 17 in the high-voltage vacuum switch breaking rebound limiting device of the present invention is as follows: the damper 17 includes a cylinder 172, a push rod and a connection block 171 connected in sequence, a fixing hole 172a is formed in the lower end of the cylinder 172, a connection hole 171a is formed in the connection block 171, the first damper pin 15 is mounted in the connection hole 171a, and the second damper pin 18 is mounted in the fixing hole 172 a.
As shown in fig. 7, the damper 17 is in a pulled-out state, and the distance between the connection hole 171a and the fixing hole 172a is L1; as shown in fig. 8, the damper 17 is in the pressed state, and the distance between the connection hole 171a and the fixing hole 172a is L2; l1 is greater than L2.
As shown in fig. 9 to 13, the switching-off working process of the switching-off rebound device for limiting the high-voltage vacuum switch of the invention is as follows: when the high-voltage vacuum switch is in a closing state shown in fig. 9 and is ready for a switching-off action, the device is in an initial state, a limiting piece 13 in the device is positioned at a first holding position, at the moment, a switch limiting pin 2 is positioned at the uppermost position, and the distance between the bottom surface of a bracket 11 and the switch limiting pin 2 is D1;
As shown in fig. 10, when the vacuum switch is at the position close to the intended opening position, the distance between the bottom surface of the bracket 11 and the switch limit pin 2 is D2, and the switch limit pin 2 collides with the limit piece 13;
The limiting piece 13 rotates to a third holding position (see fig. 11), the device is changed to a limiting state for limiting the rebound of the opening and closing of the vacuum switch, the switch limiting pin 2 continues to move downwards to a maximum overshoot position, the distance between the bottom surface of the bracket 11 and the switch limiting pin 2 is D3, and the limiting piece 13 needs to go through the second holding position in the process. The stopper 13 is in the third holding position for a short time by the damper 17. When the high-voltage vacuum switch generates rebound phenomenon, the switch limiting pin 2 additionally arranged on the vacuum switch moves upwards and is hooked by the limiting hook 133 at the upper part of the limiting piece 13 of the device (see figure 12), the rebound maximum amplitude of the vacuum switch is limited, and the distance between the bottom surface of the bracket 11 and the switch limiting pin 2 is D4. The switch limiting pin 2 and the limiting piece 13 have a self-retaining function after being hooked, if the switch limiting pin 2 continues to move upwards at the moment, the mutual matching of the switch limiting pin 2 and the limiting piece 13 can enable the limiting piece 13 to be subjected to clockwise torque, the limiting hook 133 can hook the switch limiting pin 2 more firmly, and the limiting piece 13 can be ensured to be reliably kept at the third retaining position in the rebound process of the vacuum switch. After that, the vacuum switch moves downward under the action of the internal opening spring until returning to the opening position, at which time the switch stopper pin 2 and the stopper hook lower surface 133a are separated, and simultaneously the stopper 13 returns to the second holding position (see fig. 13) under the action of the return spring 16 and the damper 17, completing the opening process, and the distance between the bottom surface of the bracket 11 and the switch stopper pin 2 is D5.
The buffer 17 is specially designed, so that the resistance of the buffer 17 is small in the brake separating process, namely, when the limiting piece 13 moves from the first holding position to the third holding position, and the smooth brake separating of the high-voltage vacuum switch is ensured; in the resetting process, namely, when the limiting piece 13 is restored to the second holding position from the third holding position, the buffer 17 has large resistance, the limiting hook 133 can be completely separated after the high-voltage vacuum switch is stabilized to the opening position, and the situation that the rebound failure of limiting opening is caused by the ejection of the switch limiting pin 2 caused by premature resetting is avoided.
The invention relates to a switching-on working process for limiting a switching-off rebound device of a high-voltage vacuum switch, which comprises the following steps: when the vacuum switch is in a switching-off state and is ready for switching-on, the device is in an intermediate state, the limiting piece 13 in the device is positioned at the second holding position, and the vacuum switch is normally switched on.
The reclosing working process of the switching-off rebound device for limiting the high-voltage vacuum switch is as follows: when the vacuum switch is in a closing state and ready to perform opening and closing actions, the device is in an initial position, the opening and closing processes are repeated, the limiting piece 13 is limited from the first holding position to the second holding position, then is limited at the third holding position, finally is restored to the second holding position under the action of the reset spring 16 and the buffer 17, and is kept in a stable state, at the moment, the opening and closing actions are completed, the reset time of the device from the third holding position to the second holding position is less than 260ms (for common high-voltage vacuum switches, the reset time of a special switch can be designed according to actual conditions), the requirements of opening and closing operations and the time interval between opening and closing operations are met, and the high-voltage vacuum switch can continue to perform subsequent opening and closing operations. The reclosing action of the high-voltage vacuum switch is not affected by the device.
The invention provides a device for limiting the rebound of a high-voltage vacuum switch opening, which can limit the maximum amplitude of the rebound of the opening on the premise of not affecting the function and the performance of the high-voltage vacuum switch, avoid the power grid accident caused by the overlarge rebound amplitude and solve the potential safety hazard in the aspect of the rebound of the opening.
The device added on the basis of the original vacuum switch has the components such as an oil buffer and the like of the original vacuum switch, and the device provided by the invention can not influence other functions and performances of the vacuum switch except for achieving the purpose of limiting the rebound amplitude of the opening rebound of the vacuum switch.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. The device for limiting the rebound of the switching-off of the high-voltage vacuum switch is characterized by comprising a device (1) for limiting the rebound of the switching-off and a switch limiting pin (2); the switch limiting pin (2) is connected to the lower side of the high-voltage vacuum switch;
the limiting opening rebound device (1) comprises a bracket (11), a limiting piece (13), a limiting piece connecting piece (14), a return spring (16) and a buffer (17);
The limiting piece (13) is rotationally connected to the bracket (11), and the limiting piece (13) is fixedly connected with the limiting piece connecting piece (14);
The bottom end of the buffer (17) is rotationally connected with the bracket (11), the top end of the buffer is rotationally connected with the limiting piece connecting piece (14), and the return spring (16) is sleeved on the buffer (17);
The limiting piece (13) comprises a limiting piece body (131), a limiting piece connecting arm (132) and a limiting hook (133) which are connected into a whole, wherein the limiting piece connecting arm (132) and the limiting hook (133) are connected to the upper side of the limiting piece body (131);
The lower surface of the limiting part body (131) is an arc surface and comprises a first positioning surface (131 a) and a second positioning surface (131 b); a bracket locating surface (112) which is attached to the lower surface of the limiting piece (13) is prefabricated on the bracket (11);
When the vacuum switch is positioned at the closing position, a first positioning surface (131 a) of the limiting piece (13) is attached to the bracket positioning surface (112), and the limiting piece (13) is positioned at a first holding position;
when the vacuum switch is positioned at the opening position, the limiting piece (13) is positioned at a second holding position;
When the vacuum switch is in a limiting state, a second positioning surface (131 b) of the limiting piece (13) is attached to the support positioning surface (112), the limiting piece (13) is in a third holding position, and the limiting piece (13) can block the movement of the switch limiting pin (2) and is used for limiting the rebound of the opening of the high-voltage vacuum switch.
2. The device for limiting the switching-off rebound of a high-voltage vacuum switch according to claim 1, wherein the bracket (11) comprises a bottom plate (111) and two support plates vertically connected to the bottom plate (111), guide grooves are formed in the two support plates, the guide grooves are used for accommodating a switch limiting pin (2), and a limiting piece (13) is placed in the two support plates and hinged with the support plates through a limiting piece pin (12);
A buffer supporting plate is connected to the upper surface of one side of the bottom plate (111), a buffer supporting hole is formed in the buffer supporting plate, and a buffer pin is installed in the buffer supporting hole and is in rotary connection with the buffer (17).
3. The device for limiting the switching-off rebound of a high-voltage vacuum switch according to claim 1, wherein the lower surface of the limiting hook (133), the upper surface of the limiting member body (131) and the limiting member connecting arm (132) form a limiting cavity (134);
the limiting piece body (131) is connected with the bracket (11) through a limiting piece pin (12).
4. A device for limiting the opening rebound of a high-voltage vacuum switch according to claim 3, wherein the limiting member body (131) is provided with a limiting member mounting hole (131 c), and the limiting member pin (12) is inserted into the limiting member mounting hole (131 c).
5. The device for limiting the switching-off rebound of a high-voltage vacuum switch according to claim 1, characterized in that the buffer (17) comprises a cylinder (172), a push rod and a connecting block (171) connected in sequence;
the connecting block (171) is rotationally connected with a first buffer pin (15), and the first buffer pin (15) is connected with the limiting piece connecting piece (14);
the cylinder body (172) is rotatably connected with a second buffer pin (18), and the second buffer pin (18) is connected to the bracket (11).
6. The device for limiting the switching-off rebound of a high-voltage vacuum switch according to claim 5, wherein a fixing hole (172 a) is formed at the lower end of the cylinder body (172), a connecting hole (171 a) is formed in the connecting block (171), the first buffer pin (15) is installed in the connecting hole (171 a), and the second buffer pin (18) is installed in the fixing hole (172 a).
7. The device for limiting the switching-off rebound of the high-voltage vacuum switch according to claim 1, wherein the switch limiting pin (2) is connected to the lower side of the high-voltage vacuum switch through a limiting pin clamping fork (3).
8. The device for limiting the switching-off rebound of the high-voltage vacuum switch according to claim 1, wherein the limiting piece connecting piece (14) is a bending plate and comprises a first plate body, a second plate body and a third plate body which are sequentially connected;
The first plate body is connected with the limiting part body (131), and the third plate body is hinged with the buffer (17).
9. A high voltage vacuum switch comprising a high voltage vacuum switch break-off rebound device as defined in any one of claims 1 to 8.
10. The switching-off method of the high-voltage vacuum switch according to claim 9, wherein when the high-voltage vacuum switch is in a switching-on state and is ready for switching off, the limiting piece (13) is positioned at a first holding position, switching off is started, the switching limiting pin (2) moves downwards, the switching limiting pin (2) collides with the limiting piece (13), the limiting piece (13) rotates to a second holding position first until reaching the limiting state, and the limiting piece rotates to a third holding position;
Under the action of the buffer (17), the limiting piece (13) is temporarily positioned at a third holding position, when the high-voltage vacuum switch generates a rebound phenomenon, the switch limiting pin (2) is hooked by the limiting hook (133) at the upper part of the limiting piece (13), so that the rebound of the vacuum switch is limited, the switch limiting pin (2) and the limiting piece (13) are hooked and then have a self-holding function, if the switch limiting pin (2) continues to move upwards at the moment, the mutual matching of the switch limiting pin (2) and the limiting piece (13) can enable the limiting piece (13) to rotate clockwise, and the limiting hook (133) hooks the switch limiting pin (2) more firmly, so that the limiting piece (13) is kept at the third holding position in the rebound process of the vacuum switch;
Then, the switch limiting pin (2) moves downwards, the lower surfaces of the switch limiting pin (2) and the limiting hook (133) are separated, and meanwhile, the limiting piece (13) is restored to the second holding position under the action of the reset spring (16) and the buffer (17), so that the brake separating process is completed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311188230.0A CN117153618B (en) | 2023-09-14 | 2023-09-14 | Device for limiting switching-off rebound of high-voltage vacuum switch, high-voltage vacuum switch and switching-off method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311188230.0A CN117153618B (en) | 2023-09-14 | 2023-09-14 | Device for limiting switching-off rebound of high-voltage vacuum switch, high-voltage vacuum switch and switching-off method thereof |
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| CN117153618A CN117153618A (en) | 2023-12-01 |
| CN117153618B true CN117153618B (en) | 2024-05-07 |
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