A fast grounding switch with arc extinguishing device for wind power

Abstract

The present invention relates to the technical field of fast grounding switches, and specifically discloses a fast grounding switch with an arc extinguishing device for wind power, comprising a central conductor, a static contact arranged on the central conductor, and a protective cover arranged below the central conductor. The present invention sets multiple sets of arc extinguishing devices, and when the piston plate is quickly pulled downward, the pressure inside the active chamber above the piston plate decreases, and under the action of the pressure difference between the inside of the protective cover and the inside of the active chamber, air flows through the inside of the suction pipe, wherein the internal gas of the protective cover enters the inside of the suction pipe through multiple through holes opened on the mounting block, and in the process of air flow, the arc generated between the static contact and the end of the moving contact rod can be attracted to the location of the mounting block, and when the arc is attracted to the location of the mounting block, on the one hand, the arc can be disconnected and extinguished faster, and on the other hand, the arc can be accelerated to enter between the metal sheets and be converted into a short arc and then extinguished.

Description

Technical Field

[0001] The invention relates to the technical field of fast grounding switches, and in particular to a fast grounding switch with an arc extinguishing device for wind power. Background Art

[0002] The fast earthing switch (FES) is an important component of the gas-insulated fully enclosed switchgear (GIS). It is usually configured on the line side of the outgoing line disconnector of the GIS outgoing line circuit to quickly cut off the fault current and protect the safety of equipment and personnel.

[0003] In the power system, especially in the field of wind power, the fast earthing switch is an important device. The super B-type fast earthing switch usually acts on the line with extremely long coupling length or extremely strong coupling with the adjacent live line. Because of its better ability to extinguish the latent power arc, it is used in the ultra-high voltage transmission line that requires automatic reclosing.

[0004] However, compared with UHV transmission lines, UHV lines have the characteristics of high voltage level, large transmission capacity, high line towers, long insulator strings, etc. The existing grounding switch technology usually only has a single arc extinguishing element inside the grounding switch, such as an arc extinguishing cover or gas-generating material, etc. The arc extinguishing capacity is limited when using a single arc extinguishing element. It is difficult to quickly and effectively extinguish the arc generated in the UHV transmission line, affecting the switch's ability to break the induced current, which may lead to insufficient reliability and stability of the switch, and further damage the fast grounding switch in the UHV transmission line, causing electrical faults and affecting the stability of the power system. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a fast grounding switch with an arc extinguishing device for wind power.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A fast grounding switch with an arc extinguishing device for wind power, comprising a central conductor, a static contact is arranged on the central conductor, a protective cover is arranged below the central conductor, the upper end of the protective cover is fixedly connected to the outer wall of the central conductor, an auxiliary component is arranged outside the outer wall of the upper end of the protective cover, a partition plate is fixedly installed at the lower end of the protective cover, an inner fixed cover is fixedly connected to the bottom surface of the partition plate, and the bottom surface of the partition plate is located at the outer wall of the inner fixed cover and is fixedly connected to the outer fixed cover, a movable chamber is formed between the outer fixed cover and the inner fixed cover, a piston plate is movably installed inside the movable chamber, a moving contact rod is arranged inside the inner fixed cover, the upper end of the moving contact rod passes through the corresponding position on the partition plate and extends to the inside of the protective cover to cooperate with the static contact, a first connecting piece is fixedly installed at the lower end of the moving contact rod, wherein the inside of the protective cover and the inner fixed cover and the inside of the movable chamber are all filled with insulating gas, an extrusion rod is fixedly installed at the lower end of the first connecting piece, and the extrusion rod is L-shaped, a driving component used in cooperation with the extrusion rod is arranged outside the lower end of the outer fixed cover, and an arc extinguishing device is arranged inside the protective cover on the peripheral side of the moving contact rod;

[0008] The arc extinguishing device includes an air intake pipe fixedly connected to the partition plate, the lower end of the air intake pipe passes through the corresponding position on the partition plate and extends to the interior of the active cavity and is connected to the interior of the active cavity, an air storage bin is fixedly installed on the upper end of the air intake pipe, a mounting block is fixedly installed on the air storage bin, a plurality of metal sheets are fixedly installed inside the mounting block, and through holes are opened inside the mounting block between two metal sheets, and thin-walled pipes are fixedly installed inside the plurality of through holes.

[0009] Preferably, the auxiliary component includes an air intake pipe fixedly connected to the protective cover, one end of the air intake pipe extends to the interior of the protective cover, and the other end is fixedly connected to a soft air bag, a first one-way valve is fixedly connected to the outer wall of the soft air bag, and the end of the first one-way valve is fixedly connected to a return air pipe, the other end of the return air pipe is connected to the interior of the protective cover, and a second one-way valve is arranged inside the air intake pipe.

[0010] Preferably, the bottom of the piston plate is located on both sides of the first connecting piece and is fixedly mounted with two symmetrically arranged connecting rods, the connecting rods are U-shaped and the other ends of the connecting rods are fixedly connected to the first connecting piece, an electromagnet is fixedly mounted on the lower end of the connecting rod, and a permanent magnet used in conjunction with the electromagnet is fixedly mounted on the inner wall of the inner fixed cover located above the electromagnet.

[0011] Preferably, a shielding cover is provided on the outer wall of the auxiliary component, a baffle is fixedly mounted on the upper end surface of the shielding cover, and the upper outer wall of the soft airbag is arranged in contact with the bottom surface of the baffle.

[0012] Preferably, the driving assembly is arranged inside the shielding cover, and the driving assembly includes a fixed shaft fixedly connected to the inner wall of the shielding cover, the outer wall of the fixed shaft is rotatably installed with a driving plate and a limit plate, and the driving plate and the limit plate are staggered, the end of the limit plate is fixedly installed with a first protrusion, and the outer wall of the first protrusion is movably connected to the end of the extrusion rod, the outer walls of the driving plate and the limit plate are both fixedly installed with a first fixing ring, a tension spring is arranged between the two first fixing rings, the two ends of the tension spring are respectively movably connected with the two first fixing rings, the outer wall of the driving plate is fixedly installed with a combination rod, and the outer wall of the limit plate is fixedly installed with a docking block matched with the combination rod, the outer wall of the limit plate on one side of the extrusion rod is also fixedly installed with a first blocking block, the inner position of the shielding cover corresponding to the first blocking block is fixedly installed with a second blocking block used in conjunction with the first blocking block, and the middle position of the outer wall on the side corresponding to the limit plate and the driving plate is fixedly installed with a reversing switch.

[0013] Preferably, the outer wall of the outer fixed cover is also provided with an extrusion assembly, and the extrusion assembly is arranged directly above the driving assembly. The extrusion assembly includes a limiting rod fixedly connected to the outer fixed cover, a lifting rod is slidably installed at the end of the limiting rod, a second fixing ring is fixedly installed on the outer wall of the lower end of the lifting rod, a return spring is fixedly connected to the upper surface of the second fixing ring, the other end of the return spring is fixedly connected to the bottom surface of the end of the limiting rod, and the lifting rod is arranged inside the return spring, and a second protrusion used in conjunction with the lifting rod is fixedly installed on the outer wall of the end of the driving plate.

[0014] Preferably, a reinforcing rod is fixedly mounted on the upper end of the lifting rod, and an extrusion hammer is fixedly mounted on the upper end of the reinforcing rod.

[0015] Preferably, the number of the arc extinguishing devices is three groups, and the three groups of arc extinguishing devices are equidistantly distributed around the moving contact rod.

[0016] Preferably, the upper end of the second protrusion is an arc-shaped structure, the lower end of the lifting rod is provided with a rounded corner, and the upper end of the second protrusion is used in conjunction with the lower end of the lifting rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention sets multiple sets of arc extinguishing devices. When the piston plate is quickly pulled downward, the internal pressure of the active chamber above the piston plate becomes smaller. Under the action of the pressure difference between the inside of the protective cover and the inside of the active chamber, air flows through the inside of the suction pipe, wherein the internal gas of the protective cover enters the inside of the suction pipe through multiple through holes penetrated through the mounting block. In the process of air flow, the arc generated between the static contact and the end of the moving contact rod can be attracted to the location of the mounting block. When the arc is attracted to the location of the mounting block, on the one hand, it can accelerate the arc disconnection and arc extinguishing, and on the other hand, it can also accelerate the arc to enter between the metal sheets and be converted into a short arc and then extinguish the arc. The arc extinguishing device can enhance the arc extinguishing ability of the fast grounding switch, improve the ability to break the induced current, and thus improve the working reliability to meet the needs of the ultra-high voltage wind power system.

[0019] The present invention sets a driving component. When an external force drives the driving plate to rotate, on the one hand, it can trigger the reversing switch so that the electromagnet and the permanent magnet repel or attract each other. On the other hand, it can drive the piston plate to move downward when the electromagnet and the permanent magnet fail to pull the piston plate down to the specified position, thereby ensuring the arc extinguishing effect of the quick grounding switch on the arc between the static contact and the moving contact rod when in use. At the same time, when in use, the driving component can also squeeze the soft air bag through the squeezing component, triggering the auxiliary component to enhance the arc extinguishing effect of the arc extinguishing device on the arc.

[0020] The present invention arranges an auxiliary component. When the lifting rod moves upward under the squeezing action of the driving component, the end of the lifting rod squeezes the soft air bag arranged on the outside of the protective cover. This process is carried out synchronously with the separation process of the static contact and the moving contact rod. The soft air bag is squeezed, and the insulating gas stored inside the soft air bag enters the interior of the protective cover at the moment the soft air bag is squeezed. On the one hand, the gas inside the protective cover can be replenished, and on the other hand, the pressure inside the protective cover can be increased, and the pressure difference between the protective cover and the inside of the active cavity can be increased, thereby enhancing the arc extinguishing effect of the arc extinguishing device on the arc between the static contact and the end of the moving contact rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure in an embodiment of the present invention;

[0023] Figure 2 It is a front view schematic diagram of the overall structure in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of a driving component in an embodiment of the present invention;

[0025] Figure 4 It is a schematic cross-sectional view of the protective cover structure in an embodiment of the present invention;

[0026] Figure 5 It is a schematic cross-sectional view of the outer fixing cover structure in an embodiment of the present invention;

[0027] Figure 6 It is a schematic cross-sectional view of the mounting block structure in an embodiment of the present invention;

[0028] Figure 7 For the embodiment of the present invention Figure 5 A partial enlarged schematic diagram in the middle;

[0029] Figure 8 This is a schematic diagram of the structure of an extrusion assembly in an embodiment of the present invention;

[0030] Fig. 9 Schematic diagram of the connection between the electromagnet and the reversing switch circuit in an embodiment of the present invention.

[0031] In the figure: 1, central conductor; 2, protective cover; 3, outer fixed cover; 4, shielding cover; 5, driving assembly; 501, driving plate; 502, limit plate; 503, first protrusion; 504, first blocking block; 505, second protrusion; 506, combination rod; 507, docking block; 508, first fixing ring; 509, tension spring; 510, fixed shaft; 511, second blocking block; 6, auxiliary assembly; 601, soft air bag; 602, first one-way valve; 603, air intake pipe; 604, second one-way valve; 605, air return pipe; 7, extrusion Pressure assembly; 701, lifting rod; 702, reinforcing rod; 703, extrusion hammer; 704, limit rod; 705, reset spring; 706, second fixed ring; 8, static contact; 9, moving contact rod; 10, first connecting piece; 11, extrusion rod; 12, inner fixed cover; 13, arc extinguishing device; 1301, suction pipe; 1302, gas storage bin; 1303, mounting block; 1304, metal sheet; 1305, thin-walled pipe; 14, piston plate; 15, permanent magnet; 16, electromagnet; 17, connecting rod; 18, baffle; 19, partition plate. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Reference Figure 1-9A fast grounding switch with an arc extinguishing device for wind power comprises a central conductor 1, a static contact 8 is arranged on the central conductor 1, a protective cover 2 is arranged below the central conductor 1, the upper end of the protective cover 2 is fixedly connected to the outer wall of the central conductor 1, an auxiliary component 6 is arranged outside the upper outer wall of the protective cover 2, a partition plate 19 is fixedly installed at the lower end of the protective cover 2, an inner fixed cover 12 is fixedly connected to the bottom surface of the partition plate 19, the center of the partition plate 19 is hollow, and the bottom surface of the partition plate 19 is located at the outer wall of the inner fixed cover 12 and is fixedly connected to the outer fixed cover 3, an active cavity is formed between the outer fixed cover 3 and the inner fixed cover 12, and the inner active cavity is movable. A piston plate 14 is installed on the movable contact rod 9, and a movable contact rod 9 is arranged inside the inner fixed cover 12. The upper end of the movable contact rod 9 passes through the corresponding position on the partition plate 19 and extends to the inside of the protective cover 2 to cooperate with the static contact 8. A first connecting piece 10 is fixedly installed on the lower end of the movable contact rod 9, wherein the inside of the protective cover 2 and the inner fixed cover 12 and the inside of the movable cavity are all filled with insulating gas, and an extrusion rod 11 is fixedly installed on the lower end of the first connecting piece 10, and the extrusion rod 11 is L-shaped. A driving assembly 5 used in cooperation with the extrusion rod 11 is arranged outside the lower end of the outer fixed cover 3, and an arc extinguishing device 13 is arranged inside the protective cover 2 on the surrounding side of the movable contact rod 9;

[0034] The arc extinguishing device 13 includes an air intake pipe 1301 fixedly connected to the partition plate 19, the lower end of the air intake pipe 1301 passes through the corresponding position on the partition plate 19 and extends to the inside of the active cavity and is connected to the inside of the active cavity, the upper end of the air intake pipe 1301 is fixedly installed with a gas storage bin 1302, the gas storage bin 1302 is fixedly installed with a mounting block 1303, a plurality of metal sheets 1304 are fixedly installed inside the mounting block 1303, and the inside of the mounting block 1303 is provided with through holes between two metal sheets 1304, and a thin-walled pipe 1305 is fixedly installed inside the plurality of through holes;

[0035] When the moving contact rod 9 is separated from the static contact 8, the fast earthing switch can be disconnected. When the first connecting piece 10 moves downward, the piston plate 14 located inside the active chamber can move downward synchronously under the joint action of the two connecting rods 17. Then, when the end of the moving contact rod 9 is separated from the static contact 8, the arc generated between the static contact 8 and the end of the moving contact rod 9 is elongated. At the same time, when the piston plate 14 moves downward inside the active chamber, the arc between the static contact 8 and the moving contact rod 9 can be extinguished quickly by the arc extinguishing device 13. In this process, when the piston plate 14 is pulled downward quickly, the pressure inside the active chamber above the piston plate 14 becomes smaller. Under the action of the pressure difference between the inside of the protective cover 2 and the inside of the active chamber, the air in the suction pipe 1301 is There is airflow passing through the protective cover 2, wherein the internal gas of the protective cover 2 enters into the interior of the suction pipe 1301 through a plurality of through holes penetrated through the mounting block 1303. In the process of airflow flow, the arc generated between the static contact 8 and the end of the moving contact rod 9 can be attracted to the location of the mounting block 1303. When the arc is attracted to the location of the mounting block 1303, on the one hand, it can accelerate the arc disconnection and extinguishing, and on the other hand, it can also accelerate the arc to enter between the metal sheets 1304 and transform into a short arc and then extinguish the arc. Three groups of equally spaced arc extinguishing devices 13 are arranged on the peripheral side of the moving contact rod 9 to avoid the arc extinguishing devices 13 being arranged relative to each other and thus affecting the flow of airflow. The three groups of arc extinguishing devices 13 cooperate with each other to ensure that the fast grounding switch extinguishes the arc quickly during use.

[0036] As a technical optimization scheme of the present invention, the auxiliary component 6 includes an air intake pipe 603 fixedly connected to the protective cover 2, one end of the air intake pipe 603 extends to the interior of the protective cover 2, and the other end is fixedly connected to a soft air bag 601, the outer wall of the soft air bag 601 is fixedly connected to a first one-way valve 602, the end of the first one-way valve 602 is fixedly connected to a return air pipe 605, the other end of the return air pipe 605 is connected to the interior of the protective cover 2, and a second one-way valve 604 is arranged inside the air intake pipe 603; when the piston plate 14 moves downward, the soft air bag 601 is squeezed, and the insulating gas stored in the soft air bag 601 enters the interior of the protective cover 2 at the moment when the soft air bag 601 is squeezed, which can replenish the gas inside the protective cover 2 on the one hand, and increase the pressure inside the protective cover 2 on the other hand, increase the pressure difference between the protective cover 2 and the inside of the active cavity, and thereby strengthen the arc extinguishing device 13 on the static contact 8 and the moving contact rod 9. The arc extinguishing effect of the arc between the ends is that when the quick grounding switch needs to be reconnected, the soft airbag 601 recovers its original shape after losing the squeezing of the external force. In the process of recovering to the initial state, the soft airbag 601 can re-suck the insulating gas inside the protective cover 2 into the soft airbag 601 for storage. In the process of deformation and recovery of the soft airbag 601, the insulating gas inside the soft airbag 601 enters the interior of the protective cover 2 through the air inlet pipe 603 and enters the interior of the soft airbag 601 through the air return pipe 605, wherein the second one-way valve 604 and the first one-way valve 602 are respectively provided on the air inlet pipe 603 and the air return pipe 605, and the first one-way valve 602 and the second one-way valve 604 are both intelligently controlled by the controller. A pressure sensor is provided inside the protective cover 2, and the air pressure balance inside the protective cover 2 can be maintained under the action of the auxiliary component 6, and the arc extinguishing speed of the arc between the static contact 8 and the end of the moving contact rod 9 can also be accelerated.

[0037] As a technical optimization scheme of the present invention, the bottom of the piston plate 14 is located on both sides of the first connecting member 10 and is fixedly installed with two symmetrically arranged connecting rods 17, the connecting rod 17 is U-shaped and the other end of the connecting rod 17 is fixedly connected to the first connecting member 10, and the lower end of the connecting rod 17 is fixedly installed with an electromagnet 16, and the inner wall of the inner fixed cover 12 is located above the electromagnet 16 and is fixedly installed with a permanent magnet 15 used in conjunction with the electromagnet 16; when the flow direction of the current on the electromagnet 16 changes, the magnetic pole of the electromagnet 16 changes, and when the static contact 8 and the moving contact rod 9 are connected, the electromagnet 16 and the permanent magnet 15 attract each other, and when the magnetic pole of the electromagnet 16 changes, the permanent magnet 15 and the electromagnet 16 repel each other, so that the electromagnet 16 drives the connecting rod 17 and the first connecting member 10 to move downward at the same time.

[0038] As a technical optimization solution of the present invention, the outer wall of the auxiliary component 6 is provided with a shielding cover 4, the upper end surface of the shielding cover 4 is fixedly installed with a baffle 18, and the upper outer wall of the soft airbag 601 is arranged in contact with the bottom surface of the baffle 18; when the bottom surface of the soft airbag 601 is squeezed, the baffle 18 located above the soft airbag 601 can block the soft airbag 601, so that the soft airbag 601 can be fully squeezed and deformed.

[0039] As a technical optimization solution of the present invention, the driving component 5 is located inside the shielding cover 4, and the driving component 5 includes a fixed shaft 510 fixedly connected to the inner wall of the shielding cover 4, the outer wall of the fixed shaft 510 is rotatably mounted with a driving plate 501 and a limiting plate 502, and the driving plate 501 and the limiting plate 502 are staggered, the end of the limiting plate 502 is fixedly mounted with a first protrusion 503, and the outer wall of the first protrusion 503 is movably connected to the end of the extrusion rod 11, the outer walls of the driving plate 501 and the limiting plate 502 are both fixedly mounted with a first fixing ring 508, and a pulling ring 508 is arranged between the two first fixing rings 508. Spring 509, both ends of the tension spring 509 are movably connected with two first fixing rings 508 respectively, a combination rod 506 is fixedly installed on the outer wall of the driving plate 501, and a docking block 507 matched with the combination rod 506 is fixedly installed on the outer wall of the limiting plate 502, a first blocking block 504 is also fixedly installed on the outer wall of the limiting plate 502 close to the extrusion rod 11, a second blocking block 511 used in conjunction with the first blocking block 504 is fixedly installed at a position corresponding to the first blocking block 504 inside the shielding cover 4, and a reversing switch is fixedly installed at the middle position of the outer wall of the limiting plate 502 corresponding to the driving plate 501;The reversing switch is an existing mature technology, and a conversion switch of model LW6-4-D280 can be used. When the reversing switch is triggered, the current direction of the circuit on the electromagnet 16 can be changed. When the quick grounding switch is in use, the external joystick driven by external force can drive the driving plate 501 to rotate around the fixed axis 510 as the axis. When it is necessary to disconnect the static contact 8 and the moving contact rod 9, the user can push the joystick to rotate the driving plate 501 in the direction close to the limit plate 502. When the driving plate 501 squeezes the reversing switch set on the limit plate 502, the flow direction of the current on the electromagnet 16 changes, thereby changing the magnetic pole of the electromagnet 16. When the driving plate 501 rotates in the opposite direction in the subsequent process, the reversing switch can be squeezed again, thereby changing the magnetic pole of the electromagnet 16 again. When the static contact 8 and the moving contact rod 9 are connected, the electromagnet 16 and the permanent magnet 15 attract each other. Then, after the magnetic pole of the electromagnet 16 changes, the permanent magnet 15 The electromagnet 16 and the connecting rod 17 repel each other, so that the electromagnet 16 drives the connecting rod 17 and the first connecting member 10 to move downward at the same time. When the fast grounding switch needs to be reconnected, the driving plate 501 is driven to rotate to the initial position through the external joystick. At this time, the tension spring 509 arranged between the driving plate 501 and the outer wall of the limiting plate 502 can pull the limiting plate 502 upward, wherein the end of the first protrusion 503 arranged at the end of the limiting plate 502 can rotate or slide relatively between the end of the extrusion rod 11. Under the traction of the tension spring 509, the first protrusion 503 can drive the extrusion rod 11 movably connected thereto to move upward at the same time, and then the transmission action of the first connecting member 10 pushes the moving contact rod 9 to reset upward and reconnect with the static contact 8. During the resetting process of the limiting plate 502, the second blocking block 511 arranged on the inner wall of the shielding cover 4 can block the first blocking block 504 to prevent the limiting plate 502 from excessive rotation. ;

[0040] As a technical optimization solution of the present invention, the outer wall of the outer fixed cover 3 is also provided with an extrusion component 7, and the extrusion component 7 is arranged directly above the driving component 5. The extrusion component 7 includes a limiting rod 704 fixedly connected to the outer fixed cover 3, and a lifting rod 701 is slidably installed at the end of the limiting rod 704. A second fixing ring 706 is fixedly installed on the outer wall of the lower end of the lifting rod 701, and a return spring 705 is fixedly connected to the upper surface of the second fixing ring 706. The other end of the return spring 705 is fixedly connected to the bottom surface of the end of the limiting rod 704, and the lifting rod 701 is arranged inside the return spring 705, and the outer wall of the end of the driving plate 501 is fixedly installed with a second cam for use with the lifting rod 701. Block 505; when the driving plate 501 starts to rotate, the second protruding block 505 can squeeze the end of the lifting rod 701, so that the lifting rod 701 is lifted upward. After the lifting rod 701 is lifted upward, it can squeeze the soft air bag 601 arranged directly above it, so that the soft air bag 601 is deformed, and then the gas in the soft air bag 601 is squeezed into the interior of the protective cover 2, and in the subsequent process of further rotation of the driving plate 501, the second protrusion 505 still keeps squeezing the lifting rod 701. When the driving plate 501 is reset and the second protrusion 505 is separated from the lower end of the lifting rod 701, it is reset under the weight of the lifting rod 701 itself and the rebound action of the reset spring 705.

[0041] As a technical optimization solution of the present invention, a reinforcing rod 702 is fixedly installed on the upper end of the lifting rod 701, and an extrusion hammer 703 is fixedly installed on the upper end of the reinforcing rod 702; the setting of the extrusion hammer 703 of the reinforcing rod 702 can increase the contact area between the upper end of the lifting rod 701 and the soft air bag 601, thereby ensuring the extrusion effect of the lifting rod 701 on the soft air bag 601 when the lifting rod 701 is lifted upward.

[0042] As a technical optimization solution of the present invention, the number of arc extinguishing devices 13 is three groups, and the three groups of arc extinguishing devices 13 are equidistantly distributed around the moving contact rod 9; the setting of the three groups of arc extinguishing devices 13 can further ensure the arc extinguishing effect of the arc generated between the static contact 8 and the moving contact rod 9 when the rapid earthing switch is in use, thereby avoiding the normal use of the rapid earthing switch being affected by the failure of one group of arc extinguishing devices 13.

[0043] As a technical optimization solution of the present invention, the upper end of the second protrusion 505 is an arc-shaped structure, the lower end of the lifting rod 701 is provided with a rounded corner, and the upper end of the second protrusion 505 is used in conjunction with the lower end of the lifting rod 701; the arc-shaped outer wall of the second protrusion 505 contacts the lower end of the lifting rod 701 when it rotates, and the second cam 505 can squeeze the lower end of the lifting rod 701 when it rotates, so that the lifting rod 701 moves upward, which can ensure the effect of the second protrusion 505 on lifting the lifting rod 701 upward when it rotates, and avoid the second protrusion 505 and the lower end of the lifting rod 701 from getting stuck.

[0044] When the present invention is in use, the central conductor 1 is arranged in the GIS pipeline in the field of ultra-high voltage wind power, wherein the static contact 8 is arranged on the central conductor 1, and when the upper end of the moving contact rod 9 contacts the lower end of the static contact 8, the switch is in the on state, and the fast grounding switch can be disconnected by separating the upper end of the moving contact rod 9 from the static contact 8. When a fault occurs in the GIL pipeline, when the first connecting member 10 moves downward, under the joint action of the two connecting rods 17, the piston plate 14 located inside the active cavity can move downward synchronously, and when the end of the moving contact rod 9 is separated from the static contact 8, the arc generated between the static contact 8 and the end of the moving contact rod 9 is elongated, and at the same time, when the piston plate 14 moves downward inside the active cavity, the arc between the static contact 8 and the moving contact rod 9 can be assisted by the arc extinguishing device 13 to quickly extinguish the arc. In this process, when the piston plate 14 is pulled downward quickly, the piston plate 14 located inside the active cavity is The pressure inside the active chamber above the piston plate 14 becomes smaller. Under the action of the pressure difference between the inside of the protective cover 2 and the inside of the active chamber, air flows through the inside of the air intake pipe 1301, wherein the internal gas of the protective cover 2 enters the inside of the air intake pipe 1301 through a plurality of through holes formed through the mounting block 1303. In the process of air flow, the arc generated between the static contact 8 and the end of the moving contact rod 9 can be attracted to the location of the mounting block 1303. When the arc is attracted to the location of the mounting block 1303, on the one hand, it can accelerate the arc disconnection and extinguishing, and on the other hand, it can also accelerate the arc to enter between the metal sheets 1304 and transform into a short arc and then extinguish the arc. Three groups of equally spaced arc extinguishing devices 13 are arranged on the peripheral side of the moving contact rod 9 to avoid the arc extinguishing devices 13 being arranged relative to each other and thus affecting the flow of air flow. The three groups of arc extinguishing devices 13 cooperate with each other to ensure that the fast grounding switch extinguishes the arc quickly during use.

[0045] When the fast earthing switch is in use, the joystick in the fast earthing switch of the prior art can be used to drive the driving plate 501 to rotate around the fixed axis 510. When it is necessary to disconnect the static contact 8 and the moving contact rod 9, the user can push the joystick to rotate the driving plate 501 in the direction close to the limit plate 502. When the driving plate 501 squeezes the reversing switch provided on the limit plate 502, the flow direction of the current on the electromagnet 16 changes, thereby changing the magnetic pole of the electromagnet 16. When the static contact 8 and the moving contact rod 9 are connected, the electromagnet 16 and the permanent magnet 15 attract each other. After the magnetic pole of the electromagnet 16 changes, the permanent magnet 15 and the electromagnet 16 repel each other, thereby changing the magnetic pole of the electromagnet 16. The electromagnet 16 drives the connecting rod 17 and the first connecting member 10 to move downward at the same time. At the same time, the second protrusion 505 arranged on the outer wall of the driving plate 501 squeezes the lower end of the lifting rod 701. Then, under the action of the second protrusion 505, the lifting rod 701 can be lifted upward, and the soft air bag 601 arranged on the outer side of the protective cover 2 is squeezed by the end of the lifting rod 701 that moves upward. This process is synchronized with the separation process of the static contact 8 and the moving contact rod 9. Then, when the piston plate 14 moves downward, the soft air bag 601 is squeezed, and the insulating gas stored in the soft air bag 601 enters the interior of the protective cover 2 at the moment when the soft air bag 601 is squeezed. On the one hand, the interior of the protective cover 2 can be compressed. On the one hand, it can replenish the gas, and on the other hand, it can increase the pressure inside the protective cover 2, increase the pressure difference between the protective cover 2 and the active chamber, and then enhance the arc extinguishing effect of the arc extinguishing device 13 on the arc between the static contact 8 and the end of the moving contact rod 9. In this process, a position sensor is provided on the outer wall of the inner fixed cover 12. The position sensor can be used to detect whether the piston plate 14 moves downward to a specified position. If the repulsive force between the permanent magnet 15 and the electromagnet 16 fails to pull the piston plate 14 downward to a preset position, the position sensor can feed back a signal to the control module and the display module. At this time, the external joystick can drive the drive plate 501 to move further toward a position close to the limit plate 502. The end of the combined rod 506 disposed on the outer wall of the driving plate 501 is inserted into the interior of the docking block 507 during the process, and the limit plate 502 is synchronously rotated by squeezing the docking block 507 fixedly connected to the limit plate 502. When the limit plate 502 rotates with the fixed shaft 510 as the axis, the first protrusion 503 fixedly installed on the limit plate 502 synchronously squeezes the end of the squeezing rod 11. The end of the first protrusion 503 is movably connected to the end of the squeezing rod 11. When the squeezing rod 11 is squeezed, the first connecting member 10 fixedly connected thereto can be driven to move downward synchronously, thereby causing the piston plate 14 to move downward to a preset position, thereby ensuring that the static contact 8 and the moving contact rod 9 are disconnected.

[0046] After the static contact 8 and the moving contact rod 9 are disconnected, the user can process the relevant lines according to the actual situation. After the GIL pipeline fault is eliminated, when the fast grounding switch needs to be reconnected, the driving plate 501 is driven to rotate to the initial position through the external joystick. At this time, the tension spring 509 arranged between the driving plate 501 and the outer wall of the limit plate 502 can pull the limit plate 502 upward. Under the traction of the tension spring 509, the first protrusion 503 can drive the extrusion rod 11 movably connected thereto to move upward at the same time, and then the moving contact rod 9 is pushed to reset upward and reconnect with the static contact 8 through the transmission action of the first connecting member 10. During the resetting process of the limit plate 502, the second blocking block 511 arranged on the inner wall of the shielding cover 4 can block the first blocking block 504 to prevent the limit plate 502 from excessive rotation. When the driving plate 501 and the limit plate 502 are reset, the lifting rod 701 is The lifting rod 701 is reset downward under the action of its own gravity and the rebound of the reset spring 705, and the upper end of the lifting rod 701 is separated from the soft airbag 601. The soft airbag 601 can re-suck the insulating gas inside the protective cover 2 into the soft airbag 601 for storage in the process of restoring the initial state. In the process of deformation and recovery of the soft airbag 601, the insulating gas inside the soft airbag 601 enters the interior of the protective cover 2 through the air inlet pipe 603 and enters the interior of the soft airbag 601 through the air return pipe 605, wherein the second one-way valve 604 and the first one-way valve 602 are respectively provided on the air inlet pipe 603 and the air return pipe 605, and both the first one-way valve 602 and the second one-way valve 604 are intelligently controlled by the controller. A pressure sensor is provided inside the protective cover 2, and the air pressure balance inside the protective cover 2 can be maintained under the action of the auxiliary component 6, and the arc extinguishing speed of the arc between the static contact 8 and the end of the moving contact rod 9 can also be accelerated.

[0047] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0048] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fast grounding switch for wind power with an arc extinguishing device, comprising a central conductor (1), on which a static contact (8) is arranged, characterized in that: A protective cover (2) is provided below the central conductor (1), the upper end of the protective cover (2) is fixedly connected to the outer wall of the central conductor (1), an auxiliary component (6) is provided outside the outer wall of the upper end of the protective cover (2), a partition plate (19) is fixedly installed at the lower end of the protective cover (2), the bottom surface of the partition plate (19) is fixedly connected to the inner fixed cover (12), and the bottom surface of the partition plate (19) is located on the outer wall of the inner fixed cover (12) and is fixedly connected to the outer fixed cover (3), a movable cavity is formed between the outer fixed cover (3) and the inner fixed cover (12), a piston plate (14) is movably installed inside the movable cavity, and a movable contact rod (9) is provided inside the inner fixed cover (12). The upper end of the moving contact rod (9) passes through a corresponding position on the partition plate (19) and extends to the interior of the protective cover (2) for use with the static contact (8); the lower end of the moving contact rod (9) is fixedly mounted with a first connecting piece (10); the interiors of the protective cover (2) and the inner fixed cover (12) and the interior of the movable cavity are all filled with insulating gas; the lower end of the first connecting piece (10) is fixedly mounted with an extrusion rod (11); the extrusion rod (11) is L-shaped; the lower end of the outer fixed cover (3) is provided with a driving assembly (5) for use with the extrusion rod (11); and the interior of the protective cover (2) is provided with an arc extinguishing device (13) on the peripheral side of the moving contact rod (9); The arc extinguishing device (13) comprises an air intake pipe (1301) fixedly connected to the partition plate (19); the lower end of the air intake pipe (1301) passes through a corresponding position on the partition plate (19) and extends to the interior of the active cavity and is arranged in communication with the interior of the active cavity; a gas storage bin (1302) is fixedly installed on the upper end of the air intake pipe (1301); a mounting block (1303) is fixedly installed on the gas storage bin (1302); a plurality of metal sheets (1304) are fixedly installed inside the mounting block (1303); and through holes are provided in the interior of the mounting block (1303) between two metal sheets (1304); and thin-walled pipes (1305) are fixedly installed inside the plurality of through holes; The auxiliary component (6) comprises an air intake pipe (603) fixedly connected to the protective cover (2); one end of the air intake pipe (603) extends to the interior of the protective cover (2); the other end is fixedly connected to a soft air bag (601); the outer wall of the soft air bag (601) is fixedly connected to a first one-way valve (602); the end of the first one-way valve (602) is fixedly connected to a return air pipe (605); the other end of the return air pipe (605) is connected to the interior of the protective cover (2); and a second one-way valve (604) is provided inside the air intake pipe (603); The bottom of the piston plate (14) is located on both sides of the first connecting member (10) and is fixedly mounted with two symmetrically arranged connecting rods (17), the connecting rod (17) being arranged in a U shape and the other end of the connecting rod (17) being fixedly connected to the first connecting member (10), the lower end of the connecting rod (17) being fixedly mounted with an electromagnet (16), and the inner wall of the inner fixed cover (12) being located above the electromagnet (16) and being fixedly mounted with a permanent magnet (15) used in conjunction with the electromagnet (16); The outer wall of the auxiliary component (6) is provided with a shielding cover (4), the upper end surface of the shielding cover (4) is fixedly mounted with a baffle (18), and the upper end outer wall of the soft airbag (601) is arranged in contact with the bottom surface of the baffle (18); The drive assembly (5) is arranged inside the shielding cover (4), and the drive assembly (5) comprises a fixed shaft (510) fixedly connected to the inner wall of the shielding cover (4); a drive plate (501) and a limit plate (502) are rotatably mounted on the outer wall of the fixed shaft (510); the drive plate (501) and the limit plate (502) are staggered; a first protrusion (503) is fixedly mounted on the end of the limit plate (502); the outer wall of the first protrusion (503) is movably connected to the end of the extrusion rod (11); first fixing rings (508) are fixedly mounted on the outer walls of the drive plate (501) and the limit plate (502); a tension spring (509) is arranged between the two first fixing rings (508). The two ends of the tension spring (509) are respectively movably connected to the two first fixing rings (508); a combination rod (506) is fixedly mounted on the outer wall of the driving plate (501); a docking block (507) matched with the combination rod (506) is fixedly mounted on the outer wall of the limiting plate (502); a first blocking block (504) is also fixedly mounted on the outer wall of the limiting plate (502) on one side close to the extrusion rod (11); a second blocking block (511) used in conjunction with the first blocking block (504) is fixedly mounted at a position corresponding to the first blocking block (504) inside the shielding cover (4); and a reversing switch is fixedly mounted at a middle position of the outer wall of the limiting plate (502) on one side corresponding to the driving plate (501).

2. A fast grounding switch with an arc extinguishing device for wind power according to claim 1, characterized in that: The outer wall of the outer fixed cover (3) is also provided with an extrusion assembly (7), which is arranged directly above the driving assembly (5), and the extrusion assembly (7) includes a limit rod (704) fixedly connected to the outer fixed cover (3), a lifting rod (701) being slidably mounted on the end of the limit rod (704), a second fixing ring (706) being fixedly mounted on the outer wall of the lower end of the lifting rod (701), a return spring (705) being fixedly connected to the upper surface of the second fixing ring (706), the other end of the return spring (705) being fixedly connected to the bottom surface of the end of the limit rod (704), the lifting rod (701) being arranged inside the return spring (705), and a second protrusion (505) for use with the lifting rod (701) being fixedly mounted on the outer wall of the end of the driving plate (501).

3. A fast grounding switch with an arc extinguishing device for wind power according to claim 2, characterized in that: A reinforcing rod (702) is fixedly mounted on the upper end of the lifting rod (701), and an extrusion hammer (703) is fixedly mounted on the upper end of the reinforcing rod (702).

4. A fast grounding switch with an arc extinguishing device for wind power according to claim 3, characterized in that: The number of the arc extinguishing devices (13) is three groups, and the three groups of arc extinguishing devices (13) are equidistantly distributed around the moving contact rod (9).

5. A fast grounding switch with an arc extinguishing device for wind power according to claim 2, characterized in that: The upper end of the second protrusion (505) is an arc-shaped structure, the lower end of the lifting rod (701) is provided with a rounded corner, and the upper end of the second protrusion (505) is used in conjunction with the lower end of the lifting rod (701).

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