A high voltage on-load tap changer

Abstract

The application discloses a high-voltage load-tap switching device and relates to the technical field of tap switches. The high-voltage load-tap switching device comprises a switching mechanism, a driving mechanism and a recovery mechanism. The switching mechanism is used for completing tap switching of high voltage. The driving mechanism provides power for switching of the switching mechanism. In the application, the second moving contact is separated from the second static contact to generate an electric arc before the first moving contact is switched, and the arc is extinguished by triggering a pressure accumulator pump to release sulfur hexafluoride gas. The sulfur hexafluoride gas has the characteristics of cooling, ion removal and flameout prevention, and the arc is quickly extinguished to create an arcless environment for high-voltage switching of the first moving contact, thereby avoiding ablation of the contact by the arc and improving the safety of equipment operation. After the arc is extinguished, the negative pressure pump is triggered by meshing transmission of the internal gear and the rack to suck the sulfur hexafluoride gas in the left cavity into the recovery tank, so that the gas is quickly recovered. The economic loss caused by waste of the gas is reduced, the risk of equipment aging is lowered, and the service life of the 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, and the on-load tap changer device can change the tap of the winding under the condition of load of the transformer, so as to realize the regulation of output voltage.

[0003] And in 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 the three key stages of "cooling, ion removal and blockage of rekindling";

[0004] And 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 the residual sulfur hexafluoride gas. If the sulfur hexafluoride gas leaks and diffuses into the atmosphere, it is almost impossible to recover; and if it is left in the equipment (not effectively collected), it will react with moisture to generate corrosive substances, accelerate the aging of the equipment, and increase the cost of subsequent maintenance. SUMMARY

[0005] The purpose of the present application is to provide a high-voltage on-load tap changer to solve the problems of the prior art that the switching process is easy to generate a large arc, the gas after arc extinguishing is difficult to recover quickly and effectively, the residual SF6 is almost impossible to recover if it leaks into the atmosphere; if it is left in the equipment, it will react with moisture to generate corrosive substances, which will accelerate the aging of the equipment and increase the cost of subsequent maintenance.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a high-voltage on-load tap changer, comprising:

[0007] A switching mechanism for completing the high-voltage tap cutting process;

[0008] A driving mechanism for providing power for the switching of the switching mechanism;

[0009] 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;

[0010] The recovery mechanism comprises a recovery pipe, a pressure accumulation pump, a second moving contact, a second stationary contact and a set of annular plugs. Two cavities are formed in the inside of the recovery pipe, the left cavity has a smaller diameter than the right cavity, the pressure accumulation pump moves to the right in the inside of 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.

[0011] 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 to be 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.

[0012] Preferably, the recycling mechanism further comprises two sliding grooves opened in the inside of the recycling pipe, an inner gear and two racks.

[0013] 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 respectively meshed and transmitted at the top and the bottom of the inner gear.

[0014] Preferably, the recycling mechanism further comprises a recycling tank, a negative pressure pump and a pressure sensing switch.

[0015] 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.

[0016] 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.

[0017] 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 to keep the sealing property of the right cavity.

[0018] Preferably, the recycling mechanism further comprises a fixed seat and a second static contact.

[0019] The fixed 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 fixed seat and is used to fix the second static contact.

[0020] 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.

[0021] 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.

[0022] 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, drives the first moving contact to rotate, and is in contact with different first static contacts to conduct electricity.

[0023] Preferably, the driving mechanism comprises a transmission gear and at least six extension plates mounted on one side of the outer wall of the transmission gear.

[0024] The six extension plates rotate with the transmission gear and are used for intermittent pushing of the linkage plate.

[0025] Compared with the prior art, the application has the following beneficial effects:

[0026] 1. In the application, through the linkage of the driving mechanism and the recovery mechanism, before the switching of the first moving contact, the second moving contact is first separated from the second stationary contact to generate an electric arc, which synchronously triggers the release of sulfur hexafluoride gas for arc extinguishing by the pressure accumulator pump, and the "cooling, ion removal, and combustion interruption" characteristics of the sulfur hexafluoride gas quickly extinguish the electric arc, creating an arc-free environment for the high-voltage switching of the first moving contact, avoiding the ablation of the contact by subsequent electric arcs, and improving the safety of equipment operation. After arc extinguishing, the meshing transmission of the internal gear and the rack triggers the negative pressure pump to suck the sulfur hexafluoride gas in the left cavity into the recovery tank, realizing the rapid recovery of the gas, reducing the economic loss caused by gas waste, reducing the risk of equipment aging, and prolonging the service life of the equipment.

[0027] 2. In the application, the driving mechanism realizes the timing coordination 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 plates, ensuring that the arc extinguishing process precedes the switching of the main circuit, and the components (such as the sealing plate ensuring the sealing and the annular plug forming a gas passage) work cooperatively to ensure the stability and continuity of the high-voltage tap switching and reduce switching failures. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a front view of the structure of the high-voltage on-load tap changer in the application;

[0029] Figure 2 It is a sectional view of the structure of the high-voltage on-load tap changer in the application;

[0030] Figure 3 It is a sectional view of the structure of the high-voltage on-load tap changer in the application;

[0031] Figure 4 It is a transmission schematic diagram of the driving mechanism and the recovery mechanism in the high-voltage on-load tap changer in the application;

[0032] Figure 5 It is a sectional view of the recovery mechanism in the high-voltage on-load tap changer in the application;

[0033] Figure 6 It is a sectional view of the recovery mechanism in the high-voltage on-load tap changer in the application;

[0034] Figure 7 is a sectional view of a recycling mechanism in a high-voltage load-tap changer of the present application.

[0035] In the drawings:

[0036] 100, switching mechanism; 110, frame; 120, driving disc; 130, first moving contact; 140, winding; 150, first stationary contact;

[0037] 200, driving mechanism; 210, driving gear; 220, driving motor; 230, driven gear; 240, transmission gear; 241, gear position indicating arrow; 250, extension plate;

[0038] 300, recycling mechanism; 310, recycling pipe; 311, movable slot; 312, sealing slot; 313, built-in slot; 314, sliding slot; 320, pressure accumulator; 321, inner contact; 322, linkage plate; 323, sealing plate; 324, second moving contact; 330, sulfur hexafluoride gas tank; 331, elastic extrusion type gas valve; 340, recycling tank; 341, negative pressure pump; 343, pressure sensing switch; 350, fixed seat; 351, second stationary contact; 360, inner gear; 370, contact seat; 380, rack; 39, built-in plate; 391, annular plug;

[0039] 4, fixing frame. DETAILED DESCRIPTION

[0040] 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 other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0041] As shown in Figure 1 and Figure 2 The present embodiment discloses a high-voltage load-tap changer, which comprises a switching mechanism 100 for completing high-voltage tap processing, and a driving mechanism 200 for providing power for switching of the switching mechanism 100. In the process of realizing high-voltage switching of the switching mechanism 100, the driving mechanism 200 drives a recycling mechanism 300 to utilize sulfur hexafluoride for arc extinguishing and recycling.

[0042] In the prior art, an arc appears during high-voltage tap processing, and sulfur hexafluoride is used for arc extinguishing, but it is difficult to realize recycling of sulfur hexafluoride gas after arc extinguishing.

[0043] 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 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 annular plug 391 entering the inside of the right cavity.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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 contacts and conducts electricity with different first static contacts 150, so as to adjust the output voltage of the device.

[0049] 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.

[0050] 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, characterized in that, Including: A switching mechanism (100) is used to complete the high voltage switching process; A drive mechanism (200) provides power for the switching mechanism (100); In the process of switching the switching mechanism (100) at high voltage, the recovery mechanism (300) uses sulfur hexafluoride for arc extinguishing and recovery. The recycling mechanism (300) includes a recycling pipe (310), a accumulator pump (320), a second moving contact (324), a second stationary contact (351), and a set of annular plugs (391). The inside of the recycling pipe (310) forms a left cavity and a right cavity. The diameter of the left cavity is smaller than that of the right cavity. The accumulator pump (320) moves to the right inside the right cavity, causing the second moving contact (324) to disengage from the outside of the second stationary contact (351), and keeping the set of annular plugs (391) moving inside the right cavity, forming a channel between the second moving contact (324) and the set of annular plugs (391).

2. The high-voltage on-load tap changer according to claim 1, characterized in that: The recovery mechanism (300) also includes a sulfur hexafluoride gas tank (330), an elastic squeeze valve (331), an inner contact (321), and a contact seat (370). The elastic squeeze valve (331) is connected between the sulfur hexafluoride gas tank (330) and the accumulator pump (320). When the elastic squeeze valve (331) is squeezed, it transfers the sulfur hexafluoride gas in the sulfur hexafluoride gas tank (330) to the inside of the accumulator pump (320) and pressurizes it. The inner contact (321) is connected to the bottom of the accumulator pump (320). When the inner contact (321) moves, it contacts the contact seat (370) to form a passage.

3. A high-voltage on-load tap changer according to claim 2, characterized in that: The recycling mechanism (300) also includes two sliding grooves (314), an internal gear (360), and two racks (380) formed inside the recycling pipe (310). The internal gear (360) is rotatably connected inside the recycling pipe (310). One of the two racks (380) is installed on one side of the internal contact (321). The two racks (380) move inside the sliding groove (314) respectively and are respectively meshed and driven at the top and bottom of the internal gear (360).

4. A high-voltage on-load tap changer according to claim 3, characterized in that: The recycling mechanism (300) also includes a recycling tank (340), a negative pressure pump (341), and a pressure sensing switch (343). When one of the two racks (380) moves to the left, the pressure sensing switch (343) activates the negative pressure pump (341) to draw in the sulfur hexafluoride gas inside the left cavity and transfer it to the inside of the recovery tank (340).

5. A high-voltage on-load tap changer according to claim 4, characterized in that: The recycling mechanism (300) also includes a movable groove (311) opened inside the recycling pipe (310), two sealing grooves (312), a linkage plate (322), and a sealing plate (323). The linkage plate (322) is installed on the top of the accumulator pump (320), and two sealing plates (323) are installed on both sides of the linkage plate (322). The linkage plate (322) drives the two sealing plates (323) to move back and forth inside the sealing groove (312) to maintain the sealing of the right cavity.

6. A high-voltage on-load tap changer according to claim 5, characterized in that: The recycling mechanism (300) also includes a fixed base (350) and a second stationary contact (351); The fixing seat (350) is installed at the left end of the left cavity near the left side, and the second stationary contact (351) is installed inside the fixing seat (350) for fixing the second stationary contact (351).

7. A high-voltage on-load tap changer according to claim 1, characterized in that: The recycling mechanism (300) also includes a set of built-in plates (39) installed between a set of annular plugs (391) and a accumulator pump (320).

8. A high-voltage on-load tap changer according to claim 1, characterized in that: The switching mechanism (100) includes a frame (110), a drive disk (120), a first moving contact (130), a set of windings (140), and a set of first stationary contacts (150). The drive disk (120) is rotatably connected inside the frame (110), and the first moving contact (130) is fixedly installed inside the drive disk (120), driving the first moving contact (130) to rotate and make contact with different first stationary contacts (150) to conduct electricity.

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

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