CN116469701A - Power electronic hybrid on-load tap-changer structure for distribution transformer - Google Patents
Power electronic hybrid on-load tap-changer structure for distribution transformer Download PDFInfo
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- CN116469701A CN116469701A CN202310610311.9A CN202310610311A CN116469701A CN 116469701 A CN116469701 A CN 116469701A CN 202310610311 A CN202310610311 A CN 202310610311A CN 116469701 A CN116469701 A CN 116469701A
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- transformer
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- 230000007704 transition Effects 0.000 claims abstract description 98
- 238000010079 rubber tapping Methods 0.000 claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 238000004891 communication Methods 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 230000007935 neutral effect Effects 0.000 claims description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 34
- 230000003068 static effect Effects 0.000 claims description 22
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 238000012423 maintenance Methods 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 11
- 238000007789 sealing Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0027—Operating mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/26—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/40—Driving mechanisms, i.e. for transmitting driving force to the contacts using friction, toothed, or screw-and-nut gearing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0016—Contact arrangements for tap changers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The application relates to a power electronic hybrid on-load tap-changer structure for a distribution transformer, relates to the technical field of on-load tap-changers, and comprises a tapping mechanism, wherein the tapping mechanism comprises: the main shaft is rotatably arranged on the transformer; the moving contact assembly is arranged on the main shaft; the fixed contact assembly is arranged on the transformer, contacted with the movable contact assembly and rotated to be used for regulating voltage; the transition resistor is arranged on the moving contact assembly and is used for keeping circuit communication when the moving contact assembly and the fixed contact assembly are disconnected; and the driving assembly is arranged on the transformer and used for driving the spindle to rotate. The voltage regulation of the transformer is realized through the driving assembly, so that the stability during regulation and the service life of the tapping switch are improved; and the space occupied by the tapping switch is reduced, and the tapping switch has a simple structure and is easy to process, so that the production cost of the tapping switch is reduced.
Description
Technical Field
The application relates to the technical field of on-load tap-changer, in particular to a power electronic hybrid on-load tap-changer structure for a distribution transformer.
Background
At present, most of 10kV oil immersed transformers or dry transformers operated in a power distribution network realize output voltage regulation through a non-excitation voltage regulation tapping switch. On one hand, the output voltage cannot be adjusted in time when the load fluctuates, and the electric energy quality is affected; on the other hand, if a power cut operation is necessary for the power tap position adjustment work, the power cut time generally requires at least 2 hours. In order to realize the voltage regulation in the uninterrupted power supply state, the research of the on-load voltage regulation technology of the distribution transformer is imperative.
The traditional on-load voltage regulation implementation mode based on a mechanical transmission structure is complex in structure, large in size and high in cost, is mainly used in high-voltage large-capacity main transformers, and is rarely used in distribution transformers in China. In the case of the in-oil arcing switch, contact burnout inevitably occurs, and the contact life varies greatly depending on the load and switching frequency. If the tap switch is a vacuum switch in oil, the cost is high, the structure is complex, and the number of the operating positions of the tap switch is easily limited by the switch volume and is not suitable to be excessive, so that the problem to be solved is urgent to provide the tap switch with low cost and long service life.
Disclosure of Invention
In order to provide a low cost, high life tap changer, the present application provides a power electronic hybrid on-load tap changer structure for a distribution transformer.
The application provides a power electronic hybrid on-load tap-changer structure for distribution transformer adopts following technical scheme:
a power electronic hybrid on-load tap-changer structure for a distribution transformer, comprising a tap-changer for connection with the transformer, the tap-changer comprising:
the main shaft is rotatably arranged on the transformer;
the movable contact assembly is arranged on the main shaft;
the fixed contact assembly is arranged on the transformer and is electrically connected with the moving contact assembly, and the moving contact assembly is contacted with the fixed contact assembly and is used for regulating voltage after rotating; the movable contact assembly and the fixed contact assembly are provided with a plurality of groups;
the transition resistor is arranged on the moving contact assembly and used for keeping circuit communication when the moving contact assembly and the fixed contact assembly are disconnected;
and the driving assembly is arranged on the transformer and used for driving the spindle to rotate.
By adopting the technical scheme, the driving assembly starts to drive the main shaft to rotate, the main shaft rotates to drive the moving contact assembly to rotate, the moving contact assembly is contacted with the fixed contact assemblies at different positions, so that the voltage regulation of the transformer is realized, and when the moving contact assembly is separated from the fixed contact assembly and disconnected, the transition resistor is used for continuously keeping the circuit connected, so that the transformer is in an electrified state, thus realizing the arc-free on-load voltage regulation, improving the stability during regulation and the service life of the tapping switch, and improving the power supply quality of a power distribution system;
and the movable contact assembly and the fixed contact assembly are both provided with a plurality of groups and are connected with the main shaft, so that the main shaft and the driving assembly can realize the adjustment of the plurality of groups of movable contact assemblies and the fixed contact assembly, and the movable contact assembly is rotated in a designated range no matter the movable contact assembly rotates, so that the space occupied by horizontal movement is reduced, the space occupied by the tapping switch is reduced, and the tapping switch is simple in structure and easy to process, thereby reducing the production cost of the tapping switch.
Optionally, the stationary contact assembly includes:
the fixed contact mounting plate is arranged on the transformer;
the fixed contact bodies are arranged on the fixed contact mounting plate in a circumferential array around the axis of the spindle;
the neutral point disc is arranged on the fixed contact mounting plate, and the moving contact assembly is communicated with the neutral point disc and a certain fixed contact body after rotating.
Through adopting above-mentioned technical scheme, the moving contact subassembly is contacted with the neutral point disc all the time, and moving contact subassembly and one of them static contact body contact simultaneously, and when adjusting for moving contact subassembly and another one static contact body contact to this realizes the pressure regulating, thereby has improved the stability when adjusting, has improved tap changer's life-span.
Optionally, the moving contact assembly includes:
the moving contact mounting plate is arranged on the main shaft;
the transition contact is arranged on the moving contact mounting plate and is used for being in contact communication with the fixed contact body;
and the neutral point contact is arranged on the moving contact mounting plate and is in contact communication with the neutral point disk.
Through adopting above-mentioned technical scheme, the neutral point contact is contradicted on the disc, and the main shaft rotates and drives the moving contact mounting panel and rotate, and the moving contact mounting panel rotates and drives transition contact and neutral point contact rotation, and neutral point contact with neutral point disc all the time, and transition contact and one of them stationary contact body contact, and make transition contact and next stationary contact body contact after rotating to this realizes the pressure regulating, has improved the convenience when adjusting.
Optionally, the transition contact slides along being close to or keeping away from the direction of static contact body and sets up on the moving contact mounting panel, be provided with the elastic component who is connected with the transition contact on the moving contact mounting panel.
Through adopting above-mentioned technical scheme, elastic component makes the initial pressure that transition contact and static contact body contact have for pressure between transition contact and the static contact body can not be too big, has consequently improved the intercommunication effect, has also reduced the too big probability of wearing and tearing of pressure between transition contact and the static contact body simultaneously, can also continue to support under elastic component after the transition contact wearing and tearing moreover and press on the static contact body, thereby has improved the stability when adjusting, has improved tap changer's life-span and distribution system's power quality.
Optionally, the elastic component includes:
the mounting rod is arranged on the moving contact mounting plate in a sliding manner and is in threaded connection with a positioning nut;
the spring is sleeved on the mounting rod and connected with the moving contact mounting plate and the transition contact, and the spring enables the positioning nut to be propped against the moving contact mounting plate to position and give initial pressure when the transition contact is contacted with the static contact assembly.
Through adopting above-mentioned technical scheme, the transition contact supports under the spring effect and presses on the static contact body, when needs change, twists and moves the positioning nut and break away from with the installation pole and to realize the dismantlement of installation pole, has improved the convenience when changing the transition contact.
Optionally, insulating cushion blocks protruding out of the fixed contact mounting plates are arranged on the fixed contact mounting plates and between two adjacent fixed contact bodies, guide surfaces are arranged on the side walls of the insulating cushion blocks, which are close to two sides of the two fixed contact bodies, and the guide surfaces are used for guiding when the transition contact and the insulating cushion blocks move.
Through adopting above-mentioned technical scheme, transition contact and static contact body break away from the back and the guide surface contact, and the transition contact moves to the insulating cushion on the effect of guide surface down, and the transition contact continues to move to on the next static contact body under the effect of guide surface afterwards, therefore insulating cushion keeps apart after transition contact and static contact break away from, has reduced the probability that produces electric arc between the two, has improved the stability when adjusting, has improved tap changer's life-span and distribution system's power quality.
Optionally, a control mechanism for controlling the position of the transition contact is arranged on the moving contact mounting plate, and the control mechanism comprises:
the marking inductors are arranged on the side wall of the fixed contact mounting plate and used for marking the positions of the corresponding fixed contact bodies;
the identification sensor is arranged on the moving contact mounting plate and matched with the marking sensor to mark the position of the transition contact;
the controller is arranged on the moving contact mounting plate, is electrically connected with the plurality of marking sensors and the identification sensor and is used for controlling the start and stop of the driving assembly;
the maintaining assembly is arranged on the moving contact mounting plate and is electrically connected with the controller, so that a gap is kept between the transition contact and the fixed contact body, and when the rotating angle of the moving contact mounting plate is larger than the array angle between two adjacent fixed contact bodies, the maintaining assembly is started and is closed after the rotating of the fixed contact mounting plate is completed.
Through adopting above-mentioned technical scheme, a plurality of mark inductors are used for marking the position of every static contact body, and the discernment inductor is used for with the record data behind the mark inductor response, thereby mark the transition contact position, consequently, when voltage need be adjusted, through the mark can obtain transition contact and need rotation angle and route, then the controller control drive assembly drives the required angle and the route of transition contact rotation, thereby realize turning to required position with the optimal route, the time of adjusting spent has been shortened, the efficiency of adjusting has been improved, tap changer's life-span and distribution system's power quality have been improved.
When the rotation angle is larger than the angle of the array between two adjacent fixed contact bodies, namely, the transition contact needs to rotate to a target position, at least one fixed contact body passes through, and abrasion is easy to occur when the transition contact and the fixed contact body relatively move due to the relation of the elastic component; and the maintaining component is started to keep a gap between the transition contact and the fixed contact body, and after the rotation is completed, the maintaining component is closed, and the transition contact moves back under the action of the elastic component, so that the probability of abrasion between the transition contact and the fixed contact body during adjustment is reduced, and the service life of the tapping switch is prolonged.
Optionally, the maintenance assembly includes:
the connecting sleeve is in threaded connection with the mounting rod and abuts against the positioning nut to be positioned;
the iron sheet is arranged on the connecting sleeve;
the electromagnet is arranged on the moving contact mounting plate, when the driving assembly is electrified and operates, the electromagnet is electrified, the iron sheet is adsorbed on the electromagnet, the transition contact and the fixed contact body keep a gap, and when the driving assembly stops operating, the electromagnet is powered off, and the transition contact moves back under the action of the spring.
By adopting the technical scheme, when the driving assembly operates, the electromagnet is electrified to generate magnetism so as to pull the iron sheet to be close, the iron sheet pulls the connecting sleeve, the mounting rod and the transition contact to be far away from the fixed contact body, so that the transition contact is not contacted with the fixed contact body in the rotating process, and after the rotation is completed, the driving assembly stops operating, so that the electromagnet is powered off, and the transition contact moves back under the action of the spring to be propped against the fixed contact body, thereby realizing the separation of the transition contact and the fixed contact body in the rotating process, and prolonging the service life of the tapping switch; and the guide surface can push the transition contact to be far away from the fixed contact body in the rotation process of the transition contact, so that the iron sheet is close to the electromagnet, the probability of unsuccessful iron sheet adsorption due to small electromagnet suction is reduced, the maintenance effect of the maintenance assembly is improved, and the service life of the tapping switch and the power supply quality of a power distribution system are further improved.
Optionally, the driving assembly includes:
the grooved wheels are arranged on the main shaft and are provided with a plurality of rotating grooves around the circumferential array of the axis of the main shaft;
the stirring piece is rotatably arranged on the transformer through a rotating shaft and is matched with the rotating groove to drive the grooved wheel to rotate;
the motor is arranged on the transformer;
the first bevel gear is arranged on the motor output shaft;
the second bevel gear is arranged on the rotating shaft and meshed with the first bevel gear.
Through adopting above-mentioned technical scheme, the motor starts first bevel gear and rotates, and first bevel gear drives second bevel gear, pivot and stir the piece and rotate, stir the piece and rotate round and stir sheave and main shaft rotation appointed angle to this realizes that the motor rotates round and drives main shaft rotation appointed angle, thereby has improved precision and the convenience when controlling, has improved the stability when tapping switch operates, has improved tapping switch's life-span and distribution system's power quality.
Optionally, the main shaft is detachably connected with the moving contact assembly and sleeved with a protective sleeve connected with the moving contact assembly and the transformer.
By adopting the technical scheme, the protective sleeve is used for preventing dust and moisture of the main shaft, so that the service life of the tapping switch is prolonged.
In summary, the present application includes at least one of the following beneficial technical effects:
the driving component is used for starting to drive the moving contact component to contact with the fixed contact component at different positions, so that the voltage regulation of the transformer is realized, the arc-free on-load voltage regulation is realized, the stability during regulation and the service life of the tapping switch are improved, and the power supply quality of a power distribution system is also improved; and the space occupied by the tapping switch is reduced, and the tapping switch has a simple structure and is easy to process, so that the production cost of the tapping switch is reduced.
Drawings
FIG. 1 is a schematic perspective view of the present application with a transformer sidewall in section;
FIG. 2 is a schematic structural view of the present application, with the closure plate omitted;
FIG. 3 is a schematic structural view of the stationary contact assembly of the present application;
FIG. 4 is a schematic view of the structure of the moving contact assembly and control mechanism of the present application;
FIG. 5 is a partial exploded view of the present application, primarily showing the control mechanism;
FIG. 6 is a schematic structural view of the drive assembly of the present application;
fig. 7 is a schematic cross-sectional view of a drive assembly of the present application.
Reference numerals: 11. a power electronics assembly; 12. a mounting box; 13. a sealing plate; 14. sealing holes; 15. insulating cushion blocks; 16. a riser; 2. a tapping mechanism; 21. a main shaft; 22. a transition resistance; 23. a moving contact assembly; 24. a moving contact mounting plate; 25. a transition contact; 26. a neutral point contact; 3. a stationary contact assembly; 31. a static contact mounting plate; 32. a stationary contact body; 33. a neutral point disk; 34. a connection terminal; 4. an elastic component; 41. a mounting rod; 42. a spring; 43. a mounting plate; 44. positioning a nut; 5. a control mechanism; 51. a marker sensor; 52. identifying an inductor; 6. a maintenance assembly; 61. connecting sleeves; 62. iron sheet; 63. an electromagnet; 64. a carrying plate; 7. a drive assembly; 71. a sheave; 711. a rotating groove; 72. a toggle member; 73. a motor; 74. a first bevel gear; 75. a second bevel gear; 8. and (5) a protective sleeve.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-7.
The embodiment of the application discloses a power electronic hybrid on-load tap-changer structure for a distribution transformer.
Referring to fig. 1 and 2, a power electronic hybrid on-load tap changer structure for a distribution transformer includes a tap mechanism 2 and a power electronic component 11, which are used for being connected with the transformer, the tap mechanism 2 and the power electronic component 11 can both realize on-load voltage regulation of the transformer, so that the two components are matched to realize hybrid voltage regulation of the transformer, and the power electronic component 11 adopts a structure in the prior art.
Referring to fig. 2 and 3, the tapping mechanism 2 comprises a main shaft 21, a moving contact assembly 23 and a fixed contact assembly 3, a horizontal installation box 12 is fixedly installed on the inner top wall of the transformer, the side wall and the upper surface of the installation box 12 in the length direction are both in an opening state, and a sealing plate 13 for blocking the opening of the side wall on the installation box 12 is fixedly installed on the side wall of the installation box 12; the main shaft 21 is rotatably mounted on two opposite inner side walls of the mounting box 12, and the axis of the main shaft 21 is parallel to the length direction of the mounting box 12.
Referring to fig. 2 and 3, a moving contact assembly 23 is arranged on a main shaft 21, a fixed contact assembly 3 is arranged on a mounting box 12 and is in contact with the moving contact assembly 23, the fixed contact assembly 3 and the moving contact assembly 23 are electrically connected with a transformer, and meanwhile, the main shaft 21 rotates to drive the moving contact assembly 23 to rotate, so that the contact position of the fixed contact assembly 3 and the moving contact assembly 23 is adjusted to realize the adjustment of the voltage of the transformer; the fixed contact assembly 3 and the movable contact assembly 23 are uniformly and correspondingly provided with three groups and are arranged at intervals along the axis of the main shaft 21.
Referring to fig. 2 and 3, the stationary contact assembly 3 includes a stationary contact mounting plate 31, a plurality of stationary contact bodies 32, and a neutral point disk 33, wherein the stationary contact mounting plate 31 is fixedly mounted on the inner side wall of the mounting box 12 and is in a vertical state, and a first through hole through which the main shaft 21 passes is formed in the stationary contact mounting plate 31; the fixed contact bodies 32 are fixedly arranged on the side wall of the fixed contact mounting plate 31 and are circumferentially arranged around the axis of the main shaft 21, the neutral point disc 33 is fixedly arranged on the fixed contact mounting plate 31, the axes of the neutral point disc 33 and the main shaft 21 are coincident, a second through hole for the main shaft 21 to pass through is formed, and the fixed contact bodies 32 are positioned outside the neutral point disc 33.
Referring to fig. 2 and 3, a plurality of connection terminals 34 are integrally arranged on a side wall of the fixed contact mounting plate 31, which is close to one side of the sealing plate 13, and the connection terminals 34 are vertically arranged at intervals, a hole sealing 14 which is vertical and is used for allowing the connection terminals 34 to penetrate out is arranged on the sealing plate 13, and the connection terminals 34 are used for connecting wires; the fixed contact body 32 and the neutral point disk 33 are connected with the wiring terminal 34, so that the difference of transformer voltage is realized after the movable contact assembly 23 is in contact communication with the fixed contact body 32 at different positions, and the regulation of the transformer voltage is realized.
Referring to fig. 2 and 4, the moving contact assembly 23 includes a moving contact mounting plate 24, a transition contact 25, and a neutral point contact 26, the moving contact mounting plate 24 is in a vertical state, the moving contact mounting plate 24 is mounted on the main shaft 21, a plurality of ribs are circumferentially arranged on an outer sidewall of the main shaft 21 around an axis of the main shaft 21, and the moving contact mounting plate 24 is sleeved on the main shaft 21 and the ribs, so that the main shaft 21 and the moving contact mounting plate 24 rotate simultaneously, and the main shaft 21 and the moving contact mounting plate 24 are detachable.
Referring to fig. 2 and 4, the tapping mechanism 2 further includes a transition resistor 22, where the transition resistor 22 and the power electronic component 11 are fixedly installed on one end of the moving contact mounting plate 24, and the transition resistor 22 is used to keep on the connection of the circuit when the moving contact component 23 is disconnected from the fixed contact component 3, so as to realize on-load voltage regulation of the transformer; one end of the movable contact mounting plate 24, which is far away from the transition resistor 22, extends to the fixed contact body 32 and is provided with a plurality of first mounting holes, which are arranged in an array around the circumference of the axis of the main shaft 21, and in the embodiment, the number of the first mounting holes is two; the movable contact mounting plate 24 is provided with a second mounting hole at a position corresponding to the neutral point disk 33, the axes of the first mounting hole, the second mounting hole and the main shaft 21 are parallel, and the first mounting hole and the second mounting hole penetrate through two opposite side walls of the movable contact mounting plate 24.
Referring to fig. 3 and 4, the transition contact 25 is provided with a plurality of first mounting holes in one-to-one correspondence, the transition contact 25 is slidably mounted on the first mounting holes, the transition contact 25 is slidably mounted on the second mounting holes, the transition contact 25 contacts one of the fixed contact bodies 32, the neutral point contact 26 contacts the neutral point disc 33, so as to form a loop, and one end of each of the transition contact 25 and the neutral point contact 26, which is close to the fixed contact body 32, is provided with a spherical contact surface; the moving contact mounting plate 24 and the transition contact 25 rotate to be in contact with different fixed contact bodies 32, and meanwhile, the neutral point contact 26 rotates and is always in contact with the neutral point disc 33, so that the voltage of the transformer is adjusted.
Referring to fig. 3 and 4, the first mounting hole is provided with an elastic component 4 connected with the transition contact 25, and the second mounting hole is also provided with an elastic component 4 connected with the neutral point contact 26, the transition contact 25 is pressed against the fixed contact body 32 under the action of the elastic component 4, and the neutral point contact 26 is pressed against the neutral point disk 33 under the action of the elastic component 4, so that an initial pressure is given when the transition contact 25 contacts the fixed contact body 32 and the neutral point contact 26 contacts the neutral point disk 33, and the elastic component 4 located on the first mounting hole is taken as an example for explanation.
Referring to fig. 3, 4 and 5, one end of the transition contact 25, which is close to the fixed contact body 32, extends to the outside of the first mounting hole, while the other end is located in the first mounting hole, the elastic component 4 comprises a mounting rod 41 and a spring 42, the mounting rod 41 is coaxially and fixedly mounted on one end of the transition contact 25, which is far away from the fixed contact body 32, and extends to the outside of the first mounting hole, meanwhile, the diameter of the mounting rod 41 is smaller than that of the transition contact 25, a mounting disc 43 is fixedly mounted on the side wall of the movable contact mounting plate 24, which is far away from the fixed contact body 32, and is located in the first mounting hole, the mounting rod 41 is slidably arranged on the mounting disc 43, and a positioning nut 44 is connected to the mounting rod 41 in a threaded manner; the spring 42 is sleeved on the mounting rod 41 and is pressed against the side wall of the transition contact 25 opposite to the mounting disc 43, and the positioning nut 44 is pressed against the mounting disc 43 for positioning under the action of the spring 42.
Referring to fig. 2 and 3, insulating cushion blocks 15 are fixedly installed on the side wall of the side, close to the fixed contact bodies 32, of the fixed contact mounting plate 31 and between two adjacent fixed contact bodies 32, and the side wall of the side, far from the fixed contact mounting plate 31, of the insulating cushion blocks 15 protrudes out of the fixed contact bodies 32; the two ends of the insulating cushion block 15, which are close to the two fixed contact bodies 32, are provided with guide surfaces, one end of each guide surface, which is close to each fixed contact body 32, extends to be flush with the side wall of the fixed contact body 32, which is far away from the fixed contact mounting plate 31, and one end of each guide surface, which is far away from the fixed contact body 32, extends to the side wall of the insulating cushion block 15, which is far away from the fixed contact mounting plate 31; therefore, the transition contact 25 contacts the guiding surface after rotating, the transition contact 25 is far away from the static contact body 32 under the action of the guiding surface and moves to the insulating cushion block 15, so that a gap exists between the transition contact 25 and the static contact body 32 along the axial direction of the main shaft 21, and the transition contact 25 moves to the side wall of the next static contact body 32 under the action of the guiding surface after continuing rotating.
Referring to fig. 3, 4 and 5, a control mechanism 5 for controlling the position of the transition contact 25 is provided on the moving contact mounting plate 24, and the control mechanism 5 includes a plurality of mark sensors 51, an identification sensor 52, a controller and a maintenance assembly 6; the plurality of mark inductors 51 are fixedly arranged on the side wall of the fixed contact mounting plate 31, which is close to the side of the movable contact mounting plate 24, and the mark inductors 51 are positioned on the side of the fixed contact body 32, which is far away from the neutral point disc 33, and the plurality of mark inductors 51 are arranged in one-to-one correspondence with the plurality of fixed contact bodies 32 and are used for marking the positions of the corresponding fixed contact bodies 32; the identification sensor 52 is fixedly installed on one end of the moving contact mounting plate 24 close to the transition contact 25, and the identification sensor 52 is located on one side of the moving contact mounting plate 24 close to the fixed contact mounting plate 31.
Referring to fig. 2, 3 and 5, the controller is fixedly installed on the moving contact mounting plate 24, and is electrically connected with the driving assembly 7, the plurality of marking sensors 51 and the identification sensor 52, when the identification sensor 52 senses with one of the marking sensors 51, the position of the stationary contact body 32 contacting the transition contact 25 at this time is determined, so that the voltage value of the transformer at this time can be known; when the adjustment is needed, the position of the transition contact 25 to be rotated to the fixed contact body 32 is obtained according to the voltage value to be adjusted, so that the rotation angle of the moving contact mounting plate 24 is obtained, and meanwhile, the optimal rotation path can be obtained according to the rotation angle, so that the rotation angle of the moving contact mounting plate 24 is not more than 180 degrees when the moving contact mounting plate 24 rotates.
Referring to fig. 2, 3 and 5, the maintenance assembly 6 is disposed on the moving contact mounting plate 24 and electrically connected to the controller such that a gap is maintained between the transition contact 25 and the stationary contact body 32 in the axial direction of the main shaft 21; when the rotation angle of the moving contact mounting plate 24 and the transition contact 25 is larger than the array angle between two adjacent fixed contact bodies 32, the maintenance assembly 6 is started to enable the transition contact 25 to keep a gap with the fixed contact bodies 32, so that the transition contact 25 is not contacted with the fixed contact bodies 32 in the rotation process, after the transition contact 25 is rotated, the maintenance assembly 6 stops running, and the transition contact 25 moves back to be pressed against the fixed contact bodies 32 under the action of the springs 42, so that the probability of abrasion caused by contact with the fixed contact bodies 32 in the rotation process of the transition contact 25 is reduced.
Referring to fig. 3 and 5, the maintaining assembly 6 includes a connecting sleeve 61, an iron sheet 62 and an electromagnet 63, wherein the connecting sleeve 61 is in threaded connection with one end of the mounting rod 41, which is away from the fixed contact body 32, and is pressed against the positioning nut 44 for positioning; the movable contact mounting plate 24 is fixedly provided with a bearing plate 64 at one end close to the transition contact 25, the bearing plate 64 is positioned at one side away from the fixed contact body 32 and extends to one side of the connecting sleeve 61 away from the fixed contact body 32, the iron sheet 62 is coaxially and fixedly arranged at one end of the connecting sleeve 61 away from the transition contact 25, and the iron sheet 62 is in a disc state; the electromagnet 63 is fixedly arranged on the side wall of the bearing plate 64, which is close to one side of the iron sheet 62, and the electromagnet 63 is electrically connected with the controller and is used for realizing the on-off of the electromagnet 63; after the electromagnet 63 is electrified, the two iron sheets 62 are pulled to be close to each other and are attracted to the electromagnet 63 to be positioned, meanwhile, the transition contact 25 can be contacted with the side wall of the insulating cushion block 15, which is away from the side of the fixed contact mounting plate 31, when rotating, and the guide surface can also enable the transition contact 25 to be close to the electromagnet 63, so that the probability that the attraction of the electromagnet 63 is small and the iron sheets 62 cannot be attracted is reduced.
Referring to fig. 2 and 6, the tapping mechanism 2 further comprises a driving assembly 7, wherein the driving assembly 7 is arranged on the transformer and is used for driving the main shaft 21 to rotate, and a vertical riser 16 is fixedly arranged on the inner side wall of the installation box 12; the main shaft 21 is sleeved with a protective sleeve 8 between two adjacent fixed contact mounting plates 31 and between the fixed contact mounting plates 31 and the vertical plate 16.
Referring to fig. 3, 6 and 7, the driving assembly 7 comprises a sheave 71, a toggle member 72, a motor 73, a first bevel gear 74 and a second bevel gear 75, wherein the sheave 71 is coaxially and slidably sleeved on the main shaft 21, a plurality of rotating grooves 711 are formed in the outer side wall of the sheave 71 in an array around the axis circumference of the main shaft 21, and the number of the rotating grooves 711 is the same as that of the fixed contact body 32 and are in one-to-one correspondence with the number of the fixed contact body 32; the vertical plate 16 is provided with a bearing hole for the main shaft 21 to pass through, a horizontal rotating shaft is rotatably arranged on the side wall of the vertical plate 16 and above the grooved pulley 71, and the axes of the rotating shaft and the main shaft 21 are parallel.
Referring to fig. 3, 6 and 7, the toggle member 72 is in an oval disc shape and is coaxially and fixedly mounted on the rotating shaft, and the toggle member 72 rotates and then rotates into the rotating groove 711 and is used for toggling the sheave 71 to rotate, then the toggle member 72 enters the next rotating groove 711, and the cycle is performed, so that the toggle member 72 rotates one circle to drive the sheave 71 to rotate by an array angle between the two rotating grooves 711, and the angle is the angle of the array of the two fixed contact bodies 32. The motor 73 is fixedly arranged on the upper surface of the transformer, and an output shaft of the motor 73 vertically penetrates through the transformer and extends into the mounting box 12; a first bevel gear 74 is keyed to the output shaft of the motor 73 and located within the mounting box 12, and a second bevel gear 75 is keyed to the shaft and meshed with the first bevel gear 74; the motor 73 is started to drive the first bevel gear 74 to rotate, the first bevel gear 74 rotates to drive the second bevel gear 75, the rotating shaft and the stirring piece 72 to rotate, and the stirring piece 72 rotates to drive the grooved wheel 71 to rotate.
The working principle of the embodiment of the application is as follows:
the controller determines the required rotation angle and path of the transition contact 25 according to the requirement, the motor 73 starts to drive the main shaft 21 to rotate, the main shaft 21 rotates to drive the movable contact mounting plate 24 to rotate, the transition contact 25 moves onto the insulating cushion 15 under the action of the guide surface, meanwhile, the electromagnet 63 is electrified to enable the transition contact 25 to be far away from the fixed contact body 32, the iron sheet 62 is adsorbed on the electromagnet 63 and is used for positioning the transition contact 25, so that the transition contact 25 is not contacted with the fixed contact body 32 in the subsequent rotation, after the rotation is completed, the motor 73 stops to cut off the power supply, the transition contact 25 moves back to be pressed onto the fixed contact body 32 under the action of the spring 42, and therefore, the voltage of the transformer is regulated, the regulation efficiency is improved, the service life of the tapping switch is prolonged, and the power supply quality of a power distribution system is improved.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (10)
1. A power electronic hybrid on-load tap changer structure for distribution transformer, its characterized in that: comprising a tapping mechanism (2) for connection with a transformer, the tapping mechanism (2) comprising:
a main shaft (21), wherein the main shaft (21) is rotatably arranged on the transformer;
a moving contact assembly (23), the moving contact assembly (23) being arranged on the main shaft (21);
the static contact assembly (3), the static contact assembly (3) is arranged on the transformer and is electrically connected with the moving contact assembly (23) and the transformer, and the moving contact assembly (23) is contacted with the static contact assembly (3) and is used for regulating voltage after rotating; the movable contact assembly (23) and the fixed contact assembly (3) are provided with a plurality of groups;
the transition resistor (22) is arranged on the movable contact assembly (23) and is used for keeping circuit communication when the movable contact assembly (23) and the fixed contact assembly (3) are disconnected;
and the driving assembly (7) is arranged on the transformer and is used for driving the main shaft (21) to rotate.
2. A power electronic hybrid on-load tap-changer structure for a distribution transformer as claimed in claim 1, wherein: the stationary contact assembly (3) comprises:
the fixed contact mounting plate (31), the fixed contact mounting plate (31) is arranged on the transformer;
the fixed contact bodies (32) are arranged on the fixed contact mounting plate (31) in a circumferential array around the axis of the main shaft (21);
the neutral point disc (33), the neutral point disc (33) is arranged on the fixed contact mounting plate (31), and the movable contact assembly (23) is in contact communication with the neutral point disc (33) and a certain fixed contact body (32) after rotating.
3. A power electronic hybrid on-load tap-changer structure for a distribution transformer as claimed in claim 2, wherein: the moving contact assembly (23) comprises:
a moving contact mounting plate (24), wherein the moving contact mounting plate (24) is arranged on the main shaft (21);
the transition contact (25) is arranged on the moving contact mounting plate (24) and is used for being in contact communication with the fixed contact body (32);
and a neutral point contact (26), wherein the neutral point contact (26) is arranged on the movable contact mounting plate (24) and is in contact communication with the neutral point disc (33).
4. A power electronic hybrid on-load tap-changer structure for a distribution transformer according to claim 3, characterized in that: the transition contact (25) is slidably arranged on the moving contact mounting plate (24) along the direction approaching to or far from the fixed contact body (32), and an elastic component (4) connected with the transition contact (25) is arranged on the moving contact mounting plate (24).
5. A power electronic hybrid on-load tap changer structure for a distribution transformer as recited in claim 4, wherein: the elastic assembly (4) comprises:
the mounting rod (41) is slidably arranged on the moving contact mounting plate (24) and is in threaded connection with a positioning nut (44);
the spring (42), spring (42) cover is established on installation pole (41) and is connected with moving contact mounting panel (24) and transition contact (25), spring (42) make positioning nut (44) support and press and fix a position on moving contact mounting panel (24) and give initial pressure when transition contact (25) and static contact subassembly (3).
6. A power electronic hybrid on-load tap changer structure for a distribution transformer as recited in claim 4, wherein: the novel high-voltage power supply is characterized in that insulating cushion blocks (15) protruding out of the fixed contact mounting plates (31) are arranged on the fixed contact mounting plates (31) and between two adjacent fixed contact bodies (32), guide surfaces are arranged on side walls, close to two fixed contact bodies (32), of the insulating cushion blocks (15), and the guide surfaces are used for guiding when the transition contacts (25) and the insulating cushion blocks (15) move.
7. A power electronic hybrid on-load tap changer structure for a distribution transformer as recited in claim 6, wherein: a control mechanism (5) for controlling the position of the transition contact (25) is arranged on the moving contact mounting plate (24), and the control mechanism (5) comprises:
the marking inductors (51) are arranged on the side walls of the fixed contact mounting plates (31) and used for marking the positions of the corresponding fixed contact bodies (32);
the identification sensor (52) is arranged on the moving contact mounting plate (24) and is matched with the marking sensor (51) for marking the position of the transition contact (25);
the controller is arranged on the movable contact mounting plate (24), is electrically connected with the plurality of marking sensors (51) and the identification sensor (52) and is used for controlling the starting and stopping of the driving assembly (7);
the maintaining assembly (6) is arranged on the moving contact mounting plate (24) and is electrically connected with the controller, a gap is kept between the transition contact (25) and the fixed contact body (32), and when the rotating angle of the moving contact mounting plate (24) is larger than the array angle between two adjacent fixed contact bodies (32), the maintaining assembly (6) is started to be closed after the rotating of the fixed contact mounting plate (31) is completed.
8. A power electronic hybrid on-load tap changer structure for a distribution transformer as recited in claim 7, wherein: the maintenance assembly (6) comprises:
the connecting sleeve (61) is in threaded connection with the mounting rod (41) and abuts against the positioning nut (44) for positioning;
an iron piece (62), wherein the iron piece (62) is arranged on the connecting sleeve (61);
electromagnet (63), electromagnet (63) set up on moving contact mounting panel (24), works as when drive assembly (7) circular telegram is operated, make iron sheet (62) adsorb on electromagnet (63) and transition contact (25) keep the clearance with static contact body (32) after electromagnet (63) circular telegram, when drive assembly (7) stop operation, make transition contact (25) back move under spring (42) effect after electromagnet (63) outage.
9. A power electronic hybrid on-load tap-changer structure for a distribution transformer as claimed in claim 1, wherein: the drive assembly (7) comprises:
the grooved pulley (71) is arranged on the main shaft (21), and a plurality of rotating grooves (711) are formed in the circumferential array around the axis of the main shaft (21);
the stirring piece (72) is rotatably arranged on the transformer through a rotating shaft and is matched with the rotating groove (711) to drive the grooved wheel (71) to rotate;
a motor (73), the motor (73) being arranged on a transformer;
a first bevel gear (74), the first bevel gear (74) being arranged on the output shaft of the motor (73);
and a second bevel gear (75), wherein the second bevel gear (75) is arranged on the rotating shaft and meshed with the first bevel gear (74).
10. A power electronic hybrid on-load tap-changer structure for a distribution transformer as claimed in claim 1, wherein: the main shaft (21) is detachably connected with the moving contact assembly (23) and sleeved with a protective sleeve (8) connected with the moving contact assembly (23) and the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310610311.9A CN116469701A (en) | 2023-05-26 | 2023-05-26 | Power electronic hybrid on-load tap-changer structure for distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310610311.9A CN116469701A (en) | 2023-05-26 | 2023-05-26 | Power electronic hybrid on-load tap-changer structure for distribution transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116469701A true CN116469701A (en) | 2023-07-21 |
Family
ID=87180957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310610311.9A Pending CN116469701A (en) | 2023-05-26 | 2023-05-26 | Power electronic hybrid on-load tap-changer structure for distribution transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116469701A (en) |
-
2023
- 2023-05-26 CN CN202310610311.9A patent/CN116469701A/en active Pending
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