An oil-immersed reactance type distribution switch

Abstract

The present application relates to a kind of oil-immersed reactance type tap changer, wherein drive mechanism includes conversion index plate, conversion mechanism includes insulated shaft and conversion frame body, and the rotation of conversion index plate is driven by insulated shaft, and conversion frame body is driven to rotate;Conversion frame body includes movable contact disc A, conversion insulating disc and movable contact disc B, wherein first movable contact and second movable contact are respectively arranged on conversion insulating disc and electrically connected with movable contact disc A and movable contact disc B;Antenna static contact A that is always in contact with movable contact disc A is arranged on the upper portion of mounting frame, and the lower portion of mounting frame is provided with the static contact B of antenna that is always in contact with movable contact disc B;Multiple tap static contacts are arranged on mounting frame along the circumferential direction, and each tap static contact is respectively connected with corresponding tap on series coil in single-phase reactance type voltage regulator, and the first movable contact and the second movable contact are rotated by conversion insulating disc and are converted with each tap static contact connection.The present application is compact in structure and reliable in gear conversion, and also increases the number of gear conversion.

Description

Technical Field

[0001] This invention relates to the field of power equipment, specifically to an oil-immersed reactor tap changer. Background Technology

[0002] In existing technologies, the most widely used high and medium voltage regulators are three-phase voltage regulators, which are equipped with three-phase on-load tap changers with insulating oil arc extinguishing. The three-phase on-load tap changers synchronously regulate voltage, and during the regulation process, transition resistors are used to bridge the voltage difference between the taps for current limiting. However, during voltage regulation, an arc may occur in the insulating oil at the on-load tap changer contacts, and this arcing can lead to carbonization and deterioration of the insulating oil after a period of operation, requiring regular maintenance. Furthermore, due to installation size limitations, the maximum number of taps also restricts the voltage regulation accuracy of the on-load tap changer.

[0003] The biggest difference between single-phase reactor-type voltage regulators and existing three-phase voltage regulators lies in their design. Single-phase reactor-type voltage regulators use two sets of reactors wound in opposite directions on a single iron core, with identical reactance parameters, to bridge the voltage difference, limiting current and dividing the voltage. During voltage regulation, the on-load tap changer contacts are virtually arc-free, thus requiring no maintenance. Furthermore, the single-phase design allows for independent operation based on differences in line voltages, without interference, resulting in better voltage balance. Single-phase reactor-type voltage regulators can also achieve various adjustment ranges through different electrical connection methods. However, currently, the on-load tap changers used in high and medium voltage single-phase reactor-type voltage regulators adopt American-designed structures, which suffer from complex mechanisms and high costs. Additionally, the number of step-up and step-down taps needs further improvement. Summary of the Invention

[0004] The purpose of this invention is to provide an oil-immersed reactor tap changer with a compact structure and reliable tap position switching, while also increasing the number of tap positions and thus improving voltage regulation accuracy.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] An oil-immersed reactor-type tap changer includes a mounting frame, with a drive mechanism on the upper side and a switching mechanism inside the mounting frame. The drive mechanism includes a switching indexing plate, and the switching mechanism includes an insulating shaft and a switching frame. The insulating shaft is driven to rotate via the switching indexing plate, and the switching frame is driven to rotate via the insulating shaft. The switching frame includes a moving contact plate A, a switching insulating plate, and a moving contact plate B arranged sequentially from top to bottom. The switching insulating plate has a first moving contact and a second moving contact, and the first moving contact is electrically connected to the moving contact plate A, while the second moving contact is connected to the moving contact plate B. B. Electrical connection: The upper part of the mounting frame is provided with a reactor stationary contact A that is always in contact with the moving contact plate A, and the lower part is provided with a reactor stationary contact B that is always in contact with the moving contact plate B. Both reactor stationary contacts A and B are connected to the reactor in the single-phase reactive voltage regulator. Multiple tap stationary contacts are provided on the mounting frame along the circumferential direction, and each tap stationary contact is connected to the corresponding tap on the series coil in the single-phase reactive voltage regulator. The first moving contact and the second moving contact are rotated by a switching insulating disk and are switched to connect with each tap stationary contact.

[0007] The upper end of the insulating shaft is provided with a tracking moving contact, and the upper end of the mounting frame is provided with a tracking stationary contact disk electrically connected to the controller. A plurality of tracking stationary contacts are provided on the lower side of the tracking stationary contact disk along the circumferential direction. The tracking moving contact is driven to rotate by the insulating shaft and is switched to connect with each tracking stationary contact. When any tracking stationary contact contacts the tracking moving contact, a trigger signal is sent to the controller.

[0008] The moving contact plate A is connected to the first moving contact via a first flexible connection, and the moving contact plate B is connected to the second moving contact via a second flexible connection. The reactor stationary contact A and reactor stationary contact B have the same structure, each including an upper clamping block, a lower clamping block, and a clamping block shaft passing through the upper and lower clamping blocks. A pressure plate is provided at the upper end of the clamping block shaft, and a spring is provided between the pressure plate and the upper clamping block. The spring is sleeved on the clamping block shaft. The edge of the moving contact plate A passes between the upper and lower clamping blocks of the reactor stationary contact A, and the edge of the moving contact plate B passes between the upper and lower clamping blocks of the reactor stationary contact B. The rear end of the reactor stationary contact A is electrically connected to one pole of the reactor, and the rear end of the reactor stationary contact B is electrically connected to the other pole of the reactor.

[0009] The mounting frame has a rotatable polarity switch at its bottom, and the polarity switch has a first switch contact on one side and a second switch contact on the other side; the lower end of the insulating shaft has a fork sleeve, and the fork sleeve has a polarity switch fork for moving the polarity switch.

[0010] The mounting frame includes a top frame plate and a bottom frame plate, and multiple frame uprights are evenly distributed along the circumferential direction between the top frame plate and the bottom frame plate. Each tap stationary contact is installed on the corresponding frame upright. The upper part of one frame upright is provided with the reactor stationary contact A and the lower part is provided with the reactor stationary contact B, while the lower end of another frame upright is provided with the polarity switch, the first switch contact and the second switch contact.

[0011] The single-phase reactor-type voltage regulator includes parallel coils and series coils. When the polarity switch fork is not in contact with either side of the polarity switch, all taps of the series coil are not connected. When the polarity switch fork moves the polarity switch to contact the first switch contact, the same polarity ends of the series coil and the parallel coil are connected. When the polarity switch fork moves the polarity switch to contact the second switch contact, the opposite polarity ends of the series coil and the parallel coil are connected.

[0012] The drive mechanism includes a reversible motor, a transmission assembly, a conversion worm gear, a shift fork shaft, a cam, and an energy storage spring. The transmission assembly includes a drive worm and a transmission shaft. One end of the transmission shaft is provided with a driving worm gear, and the other end is provided with a driven worm gear. The driving worm gear meshes with the driving worm gear and is driven to rotate by the reversible motor. The driven worm gear meshes with the conversion worm gear. The conversion worm gear and the cam are both mounted on the shift fork shaft. The conversion worm gear is provided with a drive pin that drives the cam to rotate. The shift fork shaft is driven to rotate by the cam, and the energy storage spring is stretched by the cam. The lower end of the shift fork shaft is provided with an indexing fork that actuates the conversion indexing plate.

[0013] The drive mechanism includes a mounting frame, which includes a chassis. The chassis has a first support on one side and a second support on the other side. One end of the energy storage spring is connected to the cam, and the other end is connected to the first support. The conversion worm gear is rotatably mounted on the second support, and the shift fork shaft passes through the conversion worm gear and the second support in sequence. The second support has a rotatable worm gear bushing, and the middle part of the conversion worm gear is fitted into the worm gear bushing. The shift fork shaft is rotatably inserted into the worm gear bushing, and the indexing plate shift fork is located below the second support.

[0014] The shifting indexing plate has shift teeth and locking grooves interlaced along the circumferential direction on its edge, and the end of the shift teeth is provided with a shift tooth sliding groove; the indexing plate fork is driven to rotate by the fork pivot and fall into the next locking groove, while the shifting indexing plate is driven to rotate one shift tooth by the indexing plate fork.

[0015] When the conversion frame is bridging, the first moving contact and the second moving contact respectively contact the two adjacent tap stationary contacts; when the conversion frame is short-circuited, the first moving contact and the second moving contact both contact the same tap stationary contact.

[0016] The advantages and positive effects of this invention are as follows:

[0017] 1. This invention achieves voltage boosting or bucking conversion of a single-phase reactor voltage regulator by rotating the conversion frame via an insulated shaft. During the conversion process, the moving contact plates at the upper and lower ends of the conversion frame are always in contact with the corresponding stationary contacts of the reactor, thereby ensuring a reliable electrical connection between the first and second moving contacts and the two poles of the reactor. Simultaneously, the first and second moving contacts can be bridged. Figure 12 As shown), short circuit ( Figure 13 As shown), the bridging and shorting connection operations enable the present invention to achieve double the voltage boosting and deboosting function, which increases the number of voltage shifts and improves the voltage regulation accuracy of the device.

[0018] 2. This invention utilizes the polarity switch fork at the lower end of the insulating shaft to cooperate with the polarity switch at the lower end of the mounting frame, ensuring that the polarity remains unchanged during continuous voltage increase or decrease. In addition, this invention utilizes the tracking moving contact at the upper end of the insulating shaft to cooperate with the tracking stationary contact plate at the upper end of the mounting frame, which can trigger the controller to obtain a signal that it can switch to the next gear. If there is no such signal, the controller can no longer control the forward and reverse motor to rotate. Therefore, this invention can ensure reliable gear switching, thereby ensuring reliable voltage increase or decrease regulation.

[0019] 3. The drive mechanism of the present invention utilizes a drive worm and a transmission shaft to achieve worm gear conversion drive. One end of the transmission shaft is provided with a driving worm gear that meshes with the drive worm, and the other end is provided with a driven worm that cooperates with the conversion worm gear. The above design not only further simplifies the structure, but also ensures the compactness of the structure.

[0020] 4. The drive mechanism of the present invention uses the drive pin on the conversion worm gear to drive the cam to rotate, and then the cam drives the indexing plate fork at the lower end of the shift fork shaft to rotate, thereby moving the conversion indexing plate one gear. On the one hand, the cam can simultaneously stretch the energy storage spring to store energy, thereby ensuring the driving force on the conversion indexing plate and the automatic reset of the cam. On the other hand, both the conversion worm gear and the cam are sleeved on the shift fork shaft, thereby further ensuring the compactness of the structure of the present invention.

[0021] 5. The present invention has staggered gear teeth and locking grooves along the circumferential direction on the edge of the conversion indexing plate. This structure can ensure that the conversion indexing plate can only be converted to one gear at a time, and can also ensure automatic locking after the conversion indexing plate is converted to one gear. In addition, the tracking moving contact and the tracking stationary contact plate at the upper end of the mounting frame contact and trigger cooperation can further ensure the conversion reliability of the present invention.

[0022] 6. This invention achieves a modular design, which facilitates installation. The drive mechanism of this invention can be integrated on a mounting frame, and the conversion mechanism can be integrated on the insulating shaft. In this way, during installation, the conversion mechanism can be placed in the mounting frame first and the corresponding electrical connection can be completed. Then, the drive mechanism can be placed on the upper end of the mounting frame, as long as the connection between the upper end of the insulating shaft and the middle part of the conversion indexing plate is ensured. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 for Figure 1 A schematic diagram of the drive mechanism in the diagram.

[0025] Figure 3 for Figure 2 Top view of the central drive mechanism after removing the forward and reverse motors.

[0026] Figure 4 for Figure 3 Diagram of the engagement state between the drive pin and the cam. Figure 1 ,

[0027] Figure 5 for Figure 3 Diagram of the engagement state between the drive pin and the cam. Figure 2 ,

[0028] Figure 6 for Figure 3 Diagram of the engagement state between the drive pin and the cam. Figure 3 ,

[0029] Figure 7 for Figure 2 Enlarged schematic diagram of the center indexing fork.

[0030] Figure 8 for Figure 1 A schematic diagram of the intermediate conversion mechanism.

[0031] Figure 9 for Figure 8 AA view of the intermediate conversion insulation disk.

[0032] Figure 10 for Figure 1 A schematic diagram of the installation frame structure.

[0033] Figure 11 for Figure 10 BB view in

[0034] Figure 12 This is a schematic diagram showing the bridging state of the moving contact of the present invention.

[0035] Figure 13 This is a schematic diagram showing the state where only one moving contact is short-circuited in this invention.

[0036] Figure 14 This is a schematic diagram of the electrical principle of the single-phase reactor voltage regulator using the present invention.

[0037] Wherein, 1 is the drive mechanism, 101 is the forward and reverse motor, 102 is the drive worm, 103 is the transmission shaft, 1031 is the driving worm gear, 1032 is the driven worm, 104 is the conversion worm gear, 1041 is the drive pin, 105 is the shift fork shaft, 1051 is the indexing plate shift fork, 106 is the cam, 107 is the energy storage spring, 108 is the conversion indexing plate, 1081 is the drive shaft sleeve, 1082 is the gear tooth, 10821 is the gear tooth slide groove, 1083 is the locking groove, 109 is the mounting bracket, 1091 is the first support, 1092 is the chassis, and 1093 is the second support; 2 is the conversion mechanism, 201 is the insulating shaft, 202 is the tracking contact seat, 2021 is the tracking moving contact, 203 is the conversion frame, 2031 is the moving contact plate A, 2032 is the moving contact plate B, and 2033 is the... 2034 is the upper connecting shaft, 2035 is the first flexible connection, 2035 is the second flexible connection, 204 is the conversion insulation disk, 2041 is the moving contact sleeve, 2042 is the first moving contact, 2043 is the second moving contact, 205 is the shift fork shaft sleeve, 2051 is the polarity switch shift fork; 3 is the mounting frame, 301 is the tracking stationary contact disk, 302 is the reactor stationary contact A, 3021 is the upper clamping block, 3022 is the lower clamping block, 3023 is the clamping block shaft, 3024 is the pressure plate, 3025 is the spring, 303 is the tap stationary contact, 304 is the reactor stationary contact B, 305 is the frame upright plate, 306 is the polarity switch, 3061 is the first switch contact, 3062 is the second switch contact, 307 is the frame top plate, 308 is the frame bottom plate; 4 is the series coil, 5 is the parallel coil, and 6 is the controller. Detailed Implementation

[0038] The invention will now be described in further detail with reference to the accompanying drawings.

[0039] like Figure 1 As shown, the present invention includes a mounting frame 3, and the mounting frame 3 has a driving mechanism 1 on its upper side and a conversion mechanism 2 inside; as Figures 2-3 As shown, the drive mechanism 1 includes a rotatable indexing disk 108, such as... Figure 8As shown, the conversion mechanism 2 includes an insulating shaft 201 and a conversion frame 203, wherein the insulating shaft 201 is driven to rotate via the conversion indexing plate 108, and the conversion frame 203 is driven to rotate via the insulating shaft 201; as Figures 8-9 As shown, the insulating shaft 201 is provided with a tracking moving contact 2021 and a conversion frame 203. The conversion frame 203 includes a moving contact plate A2031, a conversion insulating plate 204, and a moving contact plate B2032 arranged sequentially from top to bottom. The conversion insulating plate 204 is provided with a first moving contact 2042 and a second moving contact 2043. The first moving contact 2042 is electrically connected to the moving contact plate A2031, and the second moving contact 2043 is electrically connected to the moving contact plate B2032. Figure 8 As shown, in this embodiment, the moving contact plate A2031 is connected to the first moving contact 2042 via a first flexible connection 2034, and the moving contact plate B2032 is connected to the second moving contact 2043 via a second flexible connection 2035. Additionally, in this embodiment, the moving contact plate A2031 is connected to the conversion insulating plate 204 via an upper connecting shaft 2033, and the moving contact plate B2032 is connected to the conversion insulating plate 204 via a lower connecting shaft, thereby forming the conversion frame 203. Furthermore, as... Figure 8 As shown, in this embodiment, a tracking contact seat 202 is provided on the insulating shaft 201, and the tracking moving contact 2021 is provided on the tracking contact seat 202. The tracking moving contact 2021 may adopt a shorting ring or other structure.

[0040] like Figure 10 As shown, the upper end of the mounting frame 3 is provided with a connection to the controller 6 (e.g. Figure 14 As shown, a tracking stationary contact disk 301 is electrically connected, and a plurality of tracking stationary contacts that cooperate with the tracking moving contact 2021 are provided on the lower side of the tracking stationary contact disk 301 along the circumferential direction. During operation, whenever the conversion indexing disk 108 rotates one gear, that is, it drives the insulating shaft 201 to rotate by a set angle, and simultaneously the tracking moving contact 2021 also rotates by a set angle along with the insulating shaft 201, and contacts any of the tracking stationary contacts on the lower side of the tracking stationary contact disk 301, thereby triggering the controller 6 to obtain a signal that it can switch to the next gear.

[0041] like Figures 10-13 As shown, the upper part of the mounting frame 3 is provided with a reactor stationary contact A302 that is always in contact with the moving contact plate A2031, and the rear end of the reactor stationary contact A302 is electrically connected to one pole of the reactor in the single-phase reactor-type voltage regulator. The lower part of the mounting frame 3 is provided with a reactor stationary contact B304 that is always in contact with the moving contact plate B2032, and the rear end of the reactor stationary contact B304 is electrically connected to the other pole of the reactor. This invention achieves the connection between the conversion frame 203 and the reactor (e.g., Figure 14 The electrical connection (as shown) is unaffected by the rotation of the conversion frame 203.

[0042] like Figure 10 As shown, in this embodiment, the reactor stationary contact A302 and reactor stationary contact B304 have the same structure, both including an upper clamping block 3021, a lower clamping block 3022, and a clamping block shaft 3023 passing through the upper clamping block 3021 and the lower clamping block 3022. A pressure plate 3024 is provided at the upper end of the clamping block shaft 3023, and a spring 3025 is provided between the pressure plate 3024 and the upper clamping block 3021. The spring 3025 is sleeved on the clamping block shaft 3023. When the present invention is working, as... Figure 1 As shown, the edge of the moving contact plate A2031 passes between the upper clamping block 3021 and the lower clamping block 3022 of the reactor stationary contact A302, and the edge of the moving contact plate B2032 passes between the upper clamping block 3021 and the lower clamping block 3022 of the reactor stationary contact B304. The spring 3025 is in a compressed state to ensure that the upper and lower clamping blocks are fully clamped and in contact with the corresponding moving contact plate, thereby ensuring reliable electrical connection. At the same time, the spring 3025 can adaptively float with the rotation of the moving contact plate, thus not affecting the normal rotation of the conversion frame 203. In this embodiment, the pressure plate 3024 can be threaded onto the clamping block shaft 3023, so that the compression elasticity of the spring 3025 can be adjusted by turning the knob on the pressure plate 3024.

[0043] like Figures 10-13 As shown, the mounting frame 3 has multiple tap stationary contacts 303 evenly distributed along the circumferential direction, and as... Figure 14 As shown, each stationary contact 303 of the taps is connected to the corresponding tap on the series coil 4 in the single-phase reactor voltage regulator; and as... Figures 12-13 As shown, the first moving contact 2042 and the second moving contact 2043 drive the switching insulating disk 204 to rotate via the insulating shaft 201, thereby achieving switching and contacting the corresponding tap stationary contact 303 to achieve electrical connection. When bridging in this invention, as... Figure 12 As shown, at this time, the first moving contact 2042 and the second moving contact 2043 are respectively in contact with the two adjacent tap stationary contacts 303. When the present invention is short-circuited, as shown... Figure 13 As shown, at this time, both the first moving contact 2042 and the second moving contact 2043 are in contact with the same tap stationary contact 303, so only one tap stationary contact 303 is engaged, thereby enabling the present invention to achieve a double-level boost / blow-down function. Additionally, as... Figure 9 As shown, the present invention can provide a moving contact sleeve 2041 on each moving contact as needed to enhance insulation.

[0044] like Figure 11As shown, the bottom of the mounting frame 3 is provided with a Y-shaped, rotatable polarity switch 306. The polarity switch 306 has a first switch contact 3061 on one side and a second switch contact 3062 on the other side. Figure 8 As shown, the lower end of the insulating shaft 201 is provided with a polarity switch fork 2051 for toggling the polarity switch 306. Figure 14 As shown, when the polarity switch fork 2051 and both sides of the polarity switch 306 are not in contact, all taps of the voltage regulator series coil 4 are not connected, and the voltage regulator is in the N position direct-on state. If the insulating shaft 201 rotates counterclockwise to achieve the voltage boosting state, the polarity switch fork 2051 rotates counterclockwise along with the insulating shaft 201, and achieves the voltage boosting polarity state where the polarity switch 306 is in contact with the right side of the first switch contact 3061 (i.e., the voltage regulator series coil 4 and parallel coil 5 are connected at the same polarity end). If further voltage boosting is required, the counterclockwise rotation continues, and the polarity switch 306 remains in this position. The voltage boosting position is in the right contact state until the maximum boosting position 2n is reached. When a downshift is required, the insulating shaft 201 is rotated clockwise to gradually reduce the voltage. When it reaches the N position, if further downshifting is needed, it is rotated clockwise by one angle. The polarity switch fork 2051 moves the polarity switch 306 to the left contact of the second switch contact 3062, and the device switches to the voltage reduction polarity (the opposite polarity ends of the voltage regulator series coil 4 and parallel coil 5 are connected). If further voltage reduction is needed, it is rotated clockwise. The polarity switch 306 remains in the voltage reduction polarity contact state (left contact) until the maximum voltage reduction position 2n is reached.

[0045] like Figures 10-13 As shown, in this embodiment, the mounting frame 3 includes a frame top plate 307 and a frame bottom plate 308, and multiple frame uprights 305 are evenly distributed along the circumferential direction between the frame top plate 307 and the frame bottom plate 308, with each tap stationary contact 303 respectively installed on the corresponding frame upright 305.

[0046] like Figures 10-11 As shown, in this embodiment, the upper part of any one frame plate 305 is provided with the reactor stationary contact A302 and the lower part is provided with the reactor stationary contact B304, while the lower end of the other frame plate 305 is provided with the polarity switch 306, the first switch contact 3061 and the second switch contact 3062.

[0047] like Figure 10 In this embodiment, the tracking stationary contact plate 301 is fixedly mounted on the lower side of the frame top plate 307.

[0048] like Figure 1 and Figure 10 As shown, in this embodiment, the lower end of the insulating shaft 201 is rotatably mounted on the frame base plate 308, and the upper end is connected to the middle of the conversion indexing plate 108, wherein... Figure 8 As shown, the lower end of the insulating shaft 201 is provided with a shift fork bushing 205, and the polarity switch shift fork 2051 is provided on the shift fork bushing 205.

[0049] like Figures 2-7 As shown, the drive mechanism 1 includes a reversible motor 101, a transmission assembly, a conversion worm gear 104, a shift fork shaft 105, a cam 106, and an energy storage spring 107. The conversion worm gear 104 is driven to rotate by the reversible motor 101, and the reversible motor 101 transmits torque through the transmission assembly. The conversion worm gear 104 and the cam 106 are both mounted on the shift fork shaft 105. The conversion worm gear 104 is provided with a drive pin 1041 that drives the cam 106 to rotate. The shift fork shaft 105 is driven to rotate by the cam 106, and the energy storage spring 107 is stretched by the cam 106. The lower end of the shift fork shaft 105 is provided with an indexing fork 1051 that actuates the conversion indexing plate 108.

[0050] like Figures 2-3 As shown, in this embodiment, the transmission assembly includes a drive worm 102 and a transmission shaft 103. One end of the transmission shaft 103 is provided with a driving worm gear 1031, and the other end is provided with a driven worm 1032. The drive worm 102 meshes with the driving worm gear 1031 and is driven to rotate by the forward and reverse motor 101. The driven worm 1032 meshes with the conversion worm gear 104.

[0051] like Figure 2 As shown, in this embodiment, the drive mechanism 1 further includes a mounting bracket 109, which includes a chassis 1092. The chassis 1092 is located on the upper end of the mounting frame 3. A first support 1091 is provided on one side of the chassis 1092, and a second support 1093 is provided on the other side. One end of the energy storage spring 107 is rotatably connected to the cam 106, and the other end is rotatably connected to the first support 1091. The conversion worm gear 104 is rotatably mounted on the second support 1091. On the 93, the fork shaft 105 passes sequentially through the conversion worm gear 104 and the second support 1093. In this embodiment, the second support 1093 is provided with a rotatable worm gear bushing, and the middle part of the conversion worm gear 104 is fitted onto the worm gear bushing to achieve rotation. The fork shaft 105 is rotatably inserted into the worm gear bushing, thereby achieving relative rotation with the conversion worm gear 104. The indexing fork 1051 is located below the second support 1093.

[0052] like Figure 2As shown, in this embodiment, a drive bushing 1081 is provided in the middle of the conversion indexing plate 108, and the drive bushing 1081 is rotatably mounted on the chassis 1092. The upper end of the insulating shaft 201 is fixedly connected to the drive bushing 1081.

[0053] like Figure 3 As shown, in this embodiment, the edge of the conversion indexing plate 108 is provided with staggered gear teeth 1082 and locking grooves 1083 along the circumferential direction, and the end of the gear teeth 1082 is provided with a gear tooth slide groove 10821. Figure 7 As shown, when the indexing fork 1051 is inserted into any locking slot 1083, the indexing plate 108 cannot rotate, and as... Figures 4-6 As shown, when the reversible motor 101 starts, it transmits torque sequentially through the drive worm 102 and the transmission shaft 103, causing the conversion worm wheel 104 to rotate. The meshing of the drive worm 102 with the driving worm wheel 1031 achieves primary deceleration, while the meshing of the driven worm 1032 with the conversion worm wheel 104 achieves secondary deceleration. When the rotation of the conversion worm wheel 104 causes its drive pin 1041 to rotate 180°, as... Figure 4 As shown, the drive pin 1041 contacts the cam 106, and then, as the conversion worm gear 104 continues to rotate, as... Figure 5 As shown, the drive pin 1041 pushes the cam 106 to rotate, and the cam 106 stretches the energy storage spring 107. During this process, the shift fork shaft 105 is driven to rotate by the cam 106, thereby causing the lower indexing plate shift fork 1051 to rotate and one side to wrap around into the shift tooth groove 10821 on the corresponding shift tooth 1082. When the drive pin 1041 rotates 360° to... Figure 6 At the position shown, that is, at the instant of passing the singularity position, on the one hand, the indexing fork 1051 completely disengages from the previous locking groove 1083, and on the other hand, the energy storage spring 107, which is in the maximum tension state at this time, will pull the cam 106 to continue to rotate counterclockwise quickly by 180 degrees, so that one side of the indexing fork 1051 rotates along the gear tooth slide groove 10821 and falls into the next locking groove 1083. At the same time, the indexing fork 1051 pushes the conversion indexing plate 108 to rotate one gear, thereby driving the central insulating shaft 201 to rotate one gear.

[0054] like Figure 14 As shown, the single-phase reactor-type voltage regulator of the present invention includes a parallel coil 5 (basic winding), a series coil 4 (tap winding) and a controller 6. The above structures are all known technologies in the art. The forward and reverse motor 101 is controlled to start and stop through the controller 6, thereby realizing the switching of the voltage regulator's boost or deboost level.

[0055] The working principle of this invention is as follows:

[0056] The working process of this invention is as follows:

[0057] 1. The controller 6 sends a signal to start the forward and reverse motor 101 in the drive mechanism 1, such as... Figures 2-3 As shown, the forward and reverse motor 101 transmits torque sequentially through the drive worm 102, the driving worm wheel 1031, and the driven worm 1032, thereby driving the conversion worm wheel 104 to rotate.

[0058] II. Figures 4-5 As shown, when the drive pin 1041 on the conversion worm gear 104 contacts the cam 106, the conversion worm gear 104 continues to rotate and pushes the cam 106 to rotate through the drive pin 1041 on it. During this process, on the one hand, the indexing fork 1051 at the lower end of the shift fork shaft 105 is driven to disengage from the previous locking groove 1083 on the conversion indexing plate 108 through the cam 106, and on the other hand, the cam 106 stretches the energy storage spring 107 to store energy.

[0059] III. Figure 6 As shown, when the drive pin 1041 drives the conversion worm gear 104 past the singularity position (i.e., rotates 360 degrees), the energy storage spring 107 quickly pulls the cam 106 to continue rotating 180° to reset. During this process, on the one hand, the conversion indexing plate 108 is driven to rotate one gear through the indexing plate shift fork 1051, and on the other hand, the indexing plate shift fork 1051 at the lower end of the shift fork shaft 105 is driven by the cam 106 to rotate into the next locking groove 1083 to relock.

[0060] Fourth, when the conversion indexing plate 108 rotates one gear, it also drives the insulating shaft 201 in the conversion mechanism 2 to rotate at the set gear angle. The tracking moving contact 2021 on the insulating shaft 201 also rotates and contacts the next tracking stationary contact on the lower side of the tracking stationary contact plate 301, thereby triggering the controller 6 to obtain a signal that it can switch to the next gear. If there is no such signal, the controller 6 can no longer control the forward and reverse motor 101 to rotate.

[0061] Fifth, the insulating shaft 201 simultaneously drives the conversion frame 203 to rotate by a set angle, thereby driving the first moving contact 2042 and the second moving contact 2043 on the conversion insulating disk 204 to rotate by a set angle.

[0062] In this process, firstly as Figure 1 and Figure 8As shown, the moving contact plate A2031 at the upper end of the conversion frame 203 is always in contact with the stationary contact A302 of the reactor on the mounting frame 3, and the moving contact plate B2032 at the lower end of the conversion frame 203 is always in contact with the stationary contact B304 of the reactor on the mounting frame 3. This ensures that the electrical connection between the first moving contact 2042 and the second moving contact 2043 and the two poles of the reactor is not affected by the conversion frame 203.

[0063] Secondly, as Figure 12 and Figure 13 As shown, this invention can realize connection operations of bridging, shorting, bridging, and shorting, wherein during bridging connection, as... Figure 12 As shown, at this time, the first moving contact 2042 and the second moving contact 2043 are respectively in contact with the two adjacent tap stationary contacts 303. When short-circuited, as shown... Figure 13 As shown, at this time, both the first moving contact 2042 and the second moving contact 2043 are in contact with the same tap stationary contact 303. Therefore, only one tap stationary contact 303 is connected at this time, which enables the present invention to achieve the double-level voltage adjustment function.

[0064] Again Figure 8 , Figure 11 and Figure 14 As shown, the present invention utilizes the polarity switch fork 2051 in conjunction with the polarity switch 306 at the lower end of the mounting frame 3 to ensure that the voltage boost or buck polarity remains unchanged. Wherein:

[0065] 1. When the polarity switch fork 2051 and both sides of the polarity switch 306 are not in contact, all taps of the series coil 4 of the voltage regulator are not connected, and the voltage regulator is in the N position direct-through state.

[0066] 2. If the insulating shaft 201 rotates counterclockwise to the boost state, the polarity switch fork 2051 rotates counterclockwise along with the insulating shaft 201, and moves the polarity switch 306 to the right contact state with the first switch contact 3061 (i.e., the same polarity ends of the series coil 4 and the parallel coil 5 of the voltage regulator are connected). If it is necessary to continue boosting, continue to rotate counterclockwise. The polarity switch 306 will always maintain the boost polarity (right contact) contact state until the maximum boost level 2n is reached, where n is the number of stationary contacts 303 of the tap, that is, the number of tap levels.

[0067] 3. When a downshift is required, the insulating shaft 201 is rotated clockwise to gradually reduce the voltage level. When it reaches the N position, if further downshifting is needed, it is rotated clockwise by one angle. The polarity switch fork 2051 moves the polarity switch 306 to the left contact of the second switch contact 3062, and the device is switched to the voltage reduction polarity (the opposite polarity ends of the voltage regulator series coil 4 and parallel coil 5 are connected). If further voltage reduction is needed, it is rotated clockwise, and the polarity switch 306 remains in the voltage reduction polarity contact state (left contact) until the maximum voltage reduction level 2n is reached.

[0068] Furthermore, this invention can be used flexibly as needed. For example, it can be connected in an open delta configuration (two units of this invention are connected in series in the system) or in a closed delta configuration (three units of this invention are connected in series in the system). Due to its small size, easy installation, and high operational reliability, this invention is particularly suitable for applications with high power quality requirements.

Claims

1. An oil-immersed reactor-type tap changer, characterized in that: The system includes a mounting frame (3), and the mounting frame (3) is provided with a drive mechanism (1) on its upper side and a conversion mechanism (2) inside. The drive mechanism (1) includes a conversion indexing plate (108), and the conversion mechanism (2) includes an insulating shaft (201) and a conversion frame (203). The insulating shaft (201) is driven to rotate by the conversion indexing plate (108), and the conversion frame (203) is driven to rotate by the insulating shaft (201). The conversion frame (203) includes a movable contact plate A (2031), a conversion insulating plate (204), and a movable contact plate B (2032) arranged sequentially from top to bottom. The conversion insulating plate (204) is provided with a first movable contact (2042) and a second movable contact (2043). The first movable contact (2042) is electrically connected to the movable contact plate A (2031), and the second movable contact is electrically connected to the movable contact plate A (2031). (2043) is electrically connected to the moving contact plate B (2032); the upper part of the mounting frame (3) is provided with a reactor stationary contact A (302) that is always in contact with the moving contact plate A (2031), and the lower part is provided with a reactor stationary contact B (304) that is always in contact with the moving contact plate B (2032). The reactor stationary contact A (302) and the reactor stationary contact B (304) are both connected to the reactor in the single-phase reactor voltage regulator; the mounting frame (3) is provided with multiple tap stationary contacts (303) along the circumferential direction, and each tap stationary contact (303) is connected to the corresponding tap on the series coil (4) in the single-phase reactor voltage regulator. The first moving contact (2042) and the second moving contact (2043) are rotated by the conversion insulating disk (204) and are converted and connected to each tap stationary contact (303); The mounting frame (3) has a rotatable polarity switch (306) at its bottom, and the polarity switch (306) has a first switch contact (3061) on one side and a second switch contact (3062) on the other side; the insulating shaft (201) has a fork bushing (205) at its lower end, and the fork bushing (205) has a polarity switch fork (2051) for moving the polarity switch (306); The single-phase reactor voltage regulator includes a parallel coil (5) and a series coil (4). When the polarity switch fork (2051) is not in contact with either side of the polarity switch (306), all taps of the series coil (4) are not connected. When the polarity switch fork (2051) moves the polarity switch (306) to contact the first switch contact (3061), the series coil (4) and the parallel coil (5) are connected at the same polarity end. When the polarity switch fork (2051) moves the polarity switch (306) to contact the second switch contact (3062), the series coil (4) and the parallel coil (5) are connected at the opposite polarity end.

2. The oil-immersed reactor tap changer according to claim 1, characterized in that: The upper end of the insulating shaft (201) is provided with a tracking moving contact (2021), and the upper end of the mounting frame (3) is provided with a tracking stationary contact disk (301) electrically connected to the controller (6). The lower side of the tracking stationary contact disk (301) is provided with multiple tracking stationary contacts along the circumferential direction. The tracking moving contact (2021) is driven to rotate by the insulating shaft (201) and is switched to connect with each tracking stationary contact. When any tracking stationary contact contacts the tracking moving contact (2021), a trigger signal is sent to the controller (6).

3. The oil-immersed reactor tap changer according to claim 1, characterized in that: The moving contact plate A (2031) is connected to the first moving contact (2042) via a first flexible connection (2034), and the moving contact plate B (2032) is connected to the second moving contact (2043) via a second flexible connection (2035). The reactor stationary contact A (302) and reactor stationary contact B (304) have the same structure, both including an upper clamping block (3021), a lower clamping block (3022), and a clamping block shaft (3023) passing through the upper clamping block (3021) and the lower clamping block (3022). A pressure plate (3024) is provided at the upper end of the clamping block shaft (3023), and the pressure plate (3024) and A spring (3025) is provided between the upper clamping blocks (3021), and the spring (3025) is sleeved on the clamping block shaft (3023). The edge of the moving contact plate A (2031) passes between the upper clamping block (3021) and the lower clamping block (3022) of the reactor stationary contact A (302), and the edge of the moving contact plate B (2032) passes between the upper clamping block (3021) and the lower clamping block (3022) of the reactor stationary contact B (304). The rear end of the reactor stationary contact A (302) is electrically connected to one pole of the reactor, and the rear end of the reactor stationary contact B (304) is electrically connected to the other pole of the reactor.

4. The oil-immersed reactor tap changer according to claim 1, characterized in that: The mounting frame (3) includes a frame top plate (307) and a frame bottom plate (308), and multiple frame uprights (305) are evenly distributed along the circumferential direction between the frame top plate (307) and the frame bottom plate (308). Each tap stationary contact (303) is installed on the corresponding frame upright (305). The upper part of any frame upright (305) is provided with the reactor stationary contact A (302), and the lower part is provided with the reactor stationary contact B (304). The lower end of another frame upright (305) is provided with the polarity switch (306), the first switch contact (3061), and the second switch contact (3062).

5. The oil-immersed reactor tap changer according to claim 1, characterized in that: The drive mechanism (1) includes a reversible motor (101), a transmission assembly, a conversion worm gear (104), a shift fork shaft (105), a cam (106), and an energy storage spring (107). The transmission assembly includes a drive worm (102) and a transmission shaft (103). One end of the transmission shaft (103) is provided with a driving worm gear (1031), and the other end is provided with a driven worm gear (1032). The drive worm gear (102) meshes with the driving worm gear (1031) and is driven to rotate by the reversible motor (101). The driven worm gear (1032) is driven to rotate by the reversible motor (101). 2) Engages with the conversion worm gear (104); the conversion worm gear (104) and the cam (106) are both mounted on the shift fork shaft (105), and the conversion worm gear (104) is provided with a drive pin (1041) that drives the cam (106) to rotate. The shift fork shaft (105) is driven to rotate by the cam (106), and the energy storage spring (107) is driven to stretch by the cam (106). The lower end of the shift fork shaft (105) is provided with an indexing fork (1051) that moves the conversion indexing plate (108).

6. The oil-immersed reactor tap changer according to claim 5, characterized in that: The drive mechanism (1) includes a mounting frame (109), which includes a chassis (1092). The chassis (1092) has a first support (1091) on one side and a second support (1093) on the other side. One end of the energy storage spring (107) is connected to the cam (106), and the other end is connected to the first support (1091). The conversion worm gear (104) is rotatably mounted on the second support (1093), and the shift fork shaft (105) passes through the conversion worm gear (104) and the second support (1093) in sequence. The second support (1093) is provided with a rotatable worm gear bushing, and the middle part of the conversion worm gear (104) is fitted into the worm gear bushing. The shift fork shaft (105) is rotatably inserted into the worm gear bushing, and the indexing plate shift fork (1051) is located below the second support (1093).

7. The oil-immersed reactor tap changer according to claim 5, characterized in that: The shifting indexing plate (108) has shift teeth (1082) and locking grooves (1083) interlaced along the circumferential direction on its edge, and the shift teeth (1082) have shift tooth slide grooves (10821) at their ends; the indexing plate fork (1051) is driven to rotate by the fork shaft (105) and fall into the next locking groove (1083), while the shifting indexing plate (108) is driven to rotate one shift tooth (1082) by the indexing plate fork (1051).

8. The oil-immersed reactor tap changer according to claim 1, characterized in that: When the conversion frame (203) is bridging, the first moving contact (2042) and the second moving contact (2043) respectively contact the two adjacent tap stationary contacts (303); when the conversion frame (203) is short-circuited, the first moving contact (2042) and the second moving contact (2043) both contact the same tap stationary contact (303).

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