High-voltage on-load tap-changer

Abstract

The invention discloses a high-voltage on-load tap switching device, and relates to the technical field of tap switches, and the device comprises a switching mechanism which is used for completing the slitting processing of a high voltage; the driving mechanism provides power for switching of the switching mechanism; according to the invention, through the linkage of the driving mechanism and the recovery mechanism, before the first moving contact is switched, the second moving contact is separated from the second static contact to generate an electric arc, the pressure storage pump is synchronously triggered to release sulfur hexafluoride gas for arc extinguishing, the electric arc is rapidly extinguished by using the characteristics of cooling, deionization and blocking reignition, an arc-free environment is created for the high-voltage switching of the first moving contact, and the high-voltage switching of the first moving contact is realized. After arc extinguishing, a negative pressure pump is triggered through meshing transmission of an inner gear and a rack, sulfur hexafluoride gas in a left cavity is sucked into a recovery tank, rapid gas recovery is achieved, economic losses caused by gas waste are reduced, meanwhile, the risk of equipment aging is reduced, and the service life of equipment is prolonged. The service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tap changer, in particular to a high-voltage on-load tap changer. BACKGROUND

[0002] In the power system, the on-load tap changer of high-voltage transformer is an important link to ensure the stability of power grid voltage. The on-load tap changer device can change the tap of the transformer winding under load, so as to realize the regulation of output voltage.

[0003] During the switching process, a large arc is easily generated. In order to solve the problem of arc, in the prior art, relying on the unique physical and chemical properties of sulfur hexafluoride (SF6), the arc is quickly extinguished through three key stages of "cooling, ion removal and blockage of rekindling"; After the existing equipment uses sulfur hexafluoride arc extinguishing treatment, it cannot quickly and effectively recover the gas used afterwards, which is easy to cause residual sulfur hexafluoride gas. If the sulfur hexafluoride gas leaks and diffuses into the atmosphere, it is almost impossible to recover. If it is left in the equipment (not effectively collected), it will react with moisture to generate corrosive substances, accelerate equipment aging, and increase subsequent maintenance costs. SUMMARY

[0004] The purpose of the present application is to provide a high-voltage on-load tap changer to solve the problems of large arc generated during switching process, difficult recovery of gas after arc extinguishing, residual SF6 almost impossible to recover if it leaks into the atmosphere, and corrosive substances generated by the reaction of residual SF6 with moisture, which will accelerate equipment aging and increase subsequent maintenance costs.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a high-voltage on-load tap changer, comprising: A switching mechanism for completing the high-voltage tap cutting process; A driving mechanism for providing power for the switching of the switching mechanism; A recovery mechanism, the driving mechanism drives the recovery mechanism to use sulfur hexafluoride for arc extinguishing and recovery during the high-voltage switching of the switching mechanism; The recovery mechanism includes a recovery pipe, a pressure accumulation pump, a second moving contact, a second stationary contact and a set of annular plugs. The inside of the recovery pipe forms two cavities, the left cavity has a smaller diameter than the right cavity. The pressure accumulation pump moves to the right inside the right cavity, drives the second moving contact to separate from the outside of the second stationary contact, and keeps the set of annular plugs moving to the inside of the right cavity, forming a channel between the second moving contact and the set of annular plugs.

[0006] Preferably, the recycling mechanism further comprises a sulfur hexafluoride tank, an elastic squeeze type air valve, an inner contact and a contact seat, the elastic squeeze type air valve is communicated between the sulfur hexafluoride tank and the pressure accumulating pump, when the elastic squeeze type air valve is squeezed, the sulfur hexafluoride gas in the sulfur hexafluoride tank is transmitted to the inside of the pressure accumulating pump and pressurized, the inner contact is used for being communicated at the bottom of the pressure accumulating pump, and the inner contact is in contact with the contact seat to form a passage when the inner contact moves.

[0007] Preferably, the recycling mechanism further comprises two sliding grooves opened in the inside of the recycling pipe, an inner gear and two racks. The inner gear is rotationally connected in the inside of the recycling pipe, one of the two racks is installed on one side of the inner contact, and the two racks are respectively moved in the inside of the sliding grooves and are respectively meshed and transmitted at the top and the bottom of the inner gear.

[0008] Preferably, the recycling mechanism further comprises a recycling tank, a negative pressure pump and a pressure sensing switch. When the other of the two racks moves to the left side, the pressure sensing switch is squeezed to start the negative pressure pump, the sulfur hexafluoride gas in the left cavity is sucked and transmitted to the inside of the recycling tank.

[0009] Preferably, the recycling mechanism further comprises a movable groove and two sealing grooves opened in the inside of the recycling pipe, a linkage plate and a sealing plate. The linkage plate is installed at the top of the pressure accumulating pump, the two sealing plates are respectively installed on the two sides of the linkage plate, the linkage plate drives the two sealing plates to move back and forth in the inside of the sealing grooves, and the linkage plate is used for keeping the sealing property of the right cavity.

[0010] Preferably, the recycling mechanism further comprises a fixing seat and a second static contact. The fixing seat is installed at the left end close to the left side of the left cavity, and the second static contact is installed in the inside of the fixing seat and is used for fixing the second static contact.

[0011] Preferably, the recycling mechanism further comprises a set of built-in plates, and the set of built-in plates are installed between the set of annular plugs and the pressure accumulating pump.

[0012] Preferably, the switching mechanism comprises a frame, a driving disc, a first moving contact, a set of windings and a set of first static contacts. The driving disc is rotationally connected in the inside of the frame, the first moving contact is fixedly installed in the inside of the driving disc, the driving disc drives the first moving contact to rotate, and the first moving contact is in contact with different first static contacts to conduct electricity.

[0013] Preferably, the driving mechanism comprises a transmission gear and at least six extension plates installed on one side of the outer wall of the transmission gear. The six extension plates rotate with the rotation of the transmission gear and are used for intermittently pushing the linkage plate.

[0014] Compared with the prior art, the application has the beneficial effects that: 1、In the application, through linkage of the driving mechanism and the recovery mechanism, before switching of the first moving contact, the second moving contact is first separated from the second stationary contact to generate an electric arc, triggering the release of sulfur hexafluoride gas of the pressure accumulator pump to extinguish the electric arc, and the sulfur hexafluoride gas is used to cool, ionize and block the re-ignition of the electric arc, so that an arcless environment is created for high-voltage switching of the first moving contact, the ablation of the contact by the subsequent electric arc is avoided, the safety of equipment operation is improved, and after arc extinguishing, the sulfur hexafluoride gas in the left cavity is sucked into the recovery tank through the meshing transmission of the internal gear and the rack to realize rapid recovery of the gas, thereby reducing economic losses caused by gas waste, reducing the risk of equipment aging, and prolonging the service life of the equipment.

[0015] 2、In the application, the driving mechanism realizes the time sequence cooperation of the main circuit (the first moving contact and the first stationary contact) and the auxiliary circuit (the second moving contact and the second stationary contact) through the transmission gear and the extension plate, ensures that the arc extinguishing process precedes the main circuit switching, and each component (such as the sealing plate to ensure sealing and the annular plug to form a gas passage) works cooperatively to ensure the stability and continuity of high-voltage tap switching and reduce switching failures. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front view of the structure of the high-voltage on-load tap changer according to the application; Figure 2 It is a sectional view of the structure of the high-voltage on-load tap changer according to the application; Figure 3 It is a perspective view of the switching mechanism of the high-voltage on-load tap changer according to the application; Figure 4 It is a transmission schematic diagram of the driving mechanism and the recovery mechanism of the high-voltage on-load tap changer according to the application; Figure 5 It is a sectional plan view of the recovery mechanism of the high-voltage on-load tap changer according to the application; Figure 6 It is a partial sectional plan view of the recovery mechanism of the high-voltage on-load tap changer according to the application; Figure 7 It is a sectional view of the recovery mechanism of the high-voltage on-load tap changer according to the application.

[0017] In the drawings: 100, switching mechanism; 110, frame; 120, driving disc; 130, first moving contact; 140, winding; 150, first stationary contact; 200, driving mechanism; 210, driving gear; 220, driving motor; 230, driven gear; 240, transmission gear; 241, gear position indicating arrow; 250, extension plate; 300, recovery mechanism; 310, recovery pipe; 311, movable slot; 312, sealing slot; 313, built-in slot; 314, sliding slot; 320, pressure accumulation pump; 321, inner contact; 322, linkage plate; 323, sealing plate; 324, second movable contact; 330, sulfur hexafluoride gas tank; 331, elastic extrusion type air valve; 340, recovery tank; 341, negative pressure pump; 343, pressure sensitive switch; 350, fixed seat; 351, second stationary contact; 360, inner gear; 370, contact seat; 380, rack; 39, built-in plate; 391, annular plug; 4, fixed frame. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0019] As shown in Figure 1 and Figure 2 The present embodiment discloses a high-voltage load-tap switching device, which comprises a switching mechanism 100 for completing the high-voltage tap processing, a driving mechanism 200 for providing power for the switching of the switching mechanism 100, and the driving mechanism 200 drives the recovery mechanism 300 to use sulfur hexafluoride for arc extinguishing and recovery in the realization of the high-voltage switching of the switching mechanism 100. In the prior art, an arc appears when high-voltage tapping is performed, and the prior art uses sulfur hexafluoride for arc extinguishing, but it is difficult to realize the recovery of sulfur hexafluoride gas after arc extinguishing. In the present application, as shown in Figure 7As shown, the recovery mechanism 300 includes a recovery pipe 310, a pressure accumulator pump 320, a second movable contact 324, a second stationary contact 351, and a set of annular plugs 391. The inside of the recovery pipe 310 forms two cavities, the left cavity has a smaller diameter than the right cavity. The linkage plate 322 is fixed on the top of the pressure accumulator pump 320. When the linkage plate 322 is subjected to external force, it moves to the right, driving the pressure accumulator pump 320 to move to the right inside the right cavity. The second movable contact 324 is installed on the left side of the pressure accumulator pump 320. When the second movable contact 324 is driven to move to the right, it can be separated from the outside of the second stationary contact 351, realizing line disconnection. When the second movable contact 324 is separated from the outer wall of the second stationary contact 351, a large electric arc will be generated. At the same time, the pressure accumulator pump 320 moves, continuously pressing the elastic extrusion air valve 331, so that the elastic extrusion air valve 331 can continuously deliver sulfur hexafluoride gas in the sulfur hexafluoride gas tank 330 to the inside of the pressure accumulator pump 320, and continuously pressurize the sulfur hexafluoride gas in the pressure accumulator pump 320. When the second movable contact 324 is separated from the outer wall of the second stationary contact 351, it means that the inner contact 321 moves to the rightmost position inside the built-in groove 313, and the inner contact 321 can be in contact with the contact seat 370, forming a communication circuit for starting the pressure accumulator pump 320. The compressed sulfur hexafluoride in the pressure accumulator pump 320 is sprayed out. When the pressure accumulator pump 320 reaches the rightmost end and starts, as shown, Figure 5 As shown, a set of built-in plates 39 are connected between the set of annular plugs 391 and the pressure accumulator pump 320. When the set of annular plugs 391 moves to the inside of the right cavity, a channel is formed between the second movable contact 324 and the set of annular plugs 391. Sulfur hexafluoride continuously enters the inside of the left cavity from the right cavity, using the insulation and thermal stability of sulfur hexafluoride itself to instantaneously cool the electric arc, and finally extinguish the electric arc in the deionized state. As described above, the device synchronously generates the start of the pressure accumulator pump 320, the electric arc generated by the separation of the second movable contact 324 from the second stationary contact 351, and the entry of the annular plug 391 into the right cavity.

[0020] As shown, Figure 6 The recovery mechanism 300 further includes two sliding grooves 314 opened in the inside of the recovery pipe 310, an internal gear 360, and two racks 380. During the above-described process of the pressure accumulator pump 320 driving the inner contact 321 to move and embed in the built-in groove 313, one of the two racks 380 is installed on one side of the inner contact 321, which can drive one of the two racks 380 to move. The internal gear 360 is rotatably connected to the inside of the recovery pipe 310. The two racks 380 move in the sliding grooves 314 respectively, and are meshingly transmitted on the top and bottom of the internal gear 360 respectively. When the inner contact 321 pulls one of the two racks 380 to move to the right, it is meshingly transmitted with the internal gear 360, and pushes the other rack 380 to move to the left in the sliding groove 314, forming pressure on the pressure-sensitive switch 343.

[0021] Further, as Figure 5 shown, the recycling mechanism 300 further includes a recycling tank 340, a negative pressure pump 341 and a pressure sensing switch 343, when the other of the two racks 380 moves to the left side, the pressure sensing switch 343 is pressed to start the negative pressure pump 341, and the pressure sensing switch 343 is in a flexible setting, which has a long and short adjustment, so as to keep the inside of the left cavity in a negative pressure state, and the sulfur hexafluoride gas transferred from right to left is adsorbed, and finally the sulfur hexafluoride gas is transferred to the inside of the recycling tank 340 by the negative pressure pump 341.

[0022] Further, as Figure 7 shown, the recycling mechanism 300 further includes a movable groove 311 and two sealing grooves 312 provided in the recycling pipe 310, a linkage plate 322 and a sealing plate 323, the linkage plate 322 is installed on the top of the pressure accumulation pump 320, and the two sealing plates 323 are respectively installed on the two sides of the linkage plate 322, under the action of external force, when the linkage plate 322 is driven to move, the linkage plate 322 drives the two sealing plates 323 to move back and forth in the inside of the sealing groove 312, for keeping the sealing of the right cavity.

[0023] Further, as Figure 7 shown, the recycling mechanism 300 further includes a fixed seat 350 and a second static contact 351, the fixed seat 350 is installed at the left end of the left cavity, and the second static contact 351 is installed in the inside of the fixed seat 350, for fixing the second static contact 351, and at this time the second static contact 351 is kept in a fixed state, and a channel is formed between the second static contact 351 and the left cavity, for realizing the circulation of sulfur hexafluoride gas, and the two fixed frames 4 are installed on the outer wall of the recycling pipe 310, and kept installed on one side of the frame 110, for fixing the recycling mechanism 300.

[0024] As Figure 3 shown, the switching mechanism 100 includes a frame 110, a drive rotating disc 120, a first moving contact 130, a set of windings 140 and a set of first static contacts 150, the drive rotating disc 120 is rotationally connected in the inside of the frame 110, the first moving contact 130 is fixedly installed in the inside of the drive rotating disc 120, and drives the first moving contact 130 to rotate, when the first moving contact 130 is in different rotating positions, it is in contact with different first static contacts 150 to conduct electricity, so as to adjust the output voltage of the device.

[0025] As Figure 2 shown: the driving mechanism 200 includes a transmission gear 240 and at least six extension plates 250 installed on one side of the outer wall of the transmission gear 240, as Figure 4As shown, a gear position indicating arrow 241 is arranged on the outer wall of the transmission gear 240, which is used to indicate the position relationship of the first movable contact 130. Six extension plates 250 rotate with the transmission gear 240, which are used to intermittently push the linkage plate 322. The driving gear 210 and the driven gear 230 are rotatably connected to the outer wall of the frame 110. The transmission mode is that the driven gear 230 is rotatably connected between the transmission gear 240 and the driving gear 210. The transmission gear 240 is fixedly installed on one side of the driving disc 120. The driving gear 210 is driven by the driving motor 220. The rotation of the driving gear 210 drives the rotation of the driving disc 120, so as to realize the switching process of the first movable contact 130 between different outer walls of the first stationary contact 150. In this process, when the first movable contact 130 is about to be separated from the first stationary contact 150, the other side extension plate 250 will preferentially push the linkage plate 322 to move to the rightmost end, so that the second movable contact 324 is preferentially separated from the outer wall of the second stationary contact 351.

[0026] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can make modifications to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A high voltage on-load tap changer device, characterized by The utility model relates to a high-voltage switch mechanism, comprising: Switching mechanism (100) for completing high-voltage slitting process; Driving mechanism (200) for providing power for switching of switching mechanism (100); Recycling mechanism (300) for recycling sulfur hexafluoride for arc extinguishing and recycling in the high-voltage switching of switching mechanism (100) by driving mechanism (200); The recycling mechanism (300) comprises a recycling pipe (310), a pressure accumulator (320), a second moving contact (324), a second stationary contact (351) and a set of annular plugs (391), the recycling pipe (310) has a left cavity and a right cavity formed inside, the left cavity has a smaller diameter than the right cavity, the pressure accumulator (320) moves to the right inside the right cavity, drives the second moving contact (324) to separate from the outside of the second stationary contact (351), and keeps the set of annular plugs (391) moving to the inside of the right cavity, forming a channel between the second moving contact (324) and the set of annular plugs (391).

2. A high voltage on-load tap changer device according to claim 1, characterized in that: The recycling mechanism (300) further comprises a sulfur hexafluoride gas tank (330), an elastic extrusion gas valve (331), an inner contact (321) and a contact seat (370), the elastic extrusion gas valve (331) is connected between the sulfur hexafluoride gas tank (330) and the pressure accumulator (320), when the elastic extrusion gas valve (331) is extruded, the sulfur hexafluoride gas in the sulfur hexafluoride gas tank (330) is transmitted to the inside of the pressure accumulator (320) and pressurized, the inner contact (321) is used for being connected at the bottom of the pressure accumulator (320), and the inner contact (321) is in contact with the contact seat (370) to form a passage when moving.

3. A high voltage on-load tap changer device according to claim 2, characterized in that: The recycling mechanism (300) further comprises two sliding grooves (314) opened in the recycling pipe (310), an internal gear (360) and two racks (380); The internal gear (360) is rotationally connected inside the recycling pipe (310), one of the two racks (380) is installed on one side of the inner contact (321), and the two racks (380) are respectively moved inside the sliding grooves (314) and respectively meshed and transmitted at the top and bottom of the internal gear (360).

4. A high voltage on-load tap changer device according to claim 3, characterized in that: The recycling mechanism (300) further comprises a recycling tank (340), a negative pressure pump (341) and a pressure sensing switch (343); When the other of the two racks (380) moves to the left side, the pressure sensing switch (343) is extruded to start the negative pressure pump (341), which sucks the sulfur hexafluoride gas inside the left cavity and transmits it to the inside of the recycling tank (340).

5. A high voltage on-load tap changer device according to claim 4, characterized in that: The recycling mechanism (300) further comprises a movable groove (311) and two sealing grooves (312) opened in the recycling pipe (310), a linkage plate (322) and a sealing plate (323); The linkage plate (322) is installed at the top of the pressure accumulator (320), the two sealing plates (323) are respectively installed on the two sides of the linkage plate (322), the linkage plate (322) drives the two sealing plates (323) to move back and forth inside the sealing grooves (312), and the sealing plates (323) are used for keeping the sealing property of the right cavity.

6. A high voltage on-load tap changer device according to claim 5, characterized in that: The recycling mechanism (300) further comprises a fixed seat (350) and a second static contact (351); The fixed seat (350) is installed on the left cavity near the left end, and the second static contact (351) is installed in the fixed seat (350) for fixing the second static contact (351).

7. A high voltage on-load tap changer device as claimed in claim 1, wherein: The recycling mechanism (300) further comprises a set of built-in plates (39) installed between a set of annular plugs (391) and the pressure accumulation pump (320).

8. A high voltage on-load tap changer device as claimed in claim 1, characterized in that: The switching mechanism (100) comprises a frame (110), a driving disc (120), a first moving contact (130), a set of windings (140) and a set of first static contacts (150); The driving disc (120) is rotationally connected in the inside of the frame (110), and the first moving contact (130) is fixedly installed in the inside of the driving disc (120) to drive the first moving contact (130) to rotate and contact and conduct electricity with different first static contacts (150).

9. A high voltage on-load tap changer device as claimed in claim 1, characterized in that: The driving mechanism (200) comprises a transmission gear (240) and at least six extension plates (250) installed on one side of the outer wall of the transmission gear (240); The six extension plates (250) rotate with the rotation of the transmission gear (240) to intermittently push the linkage plate (322).

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