An SVR online feeder automatic voltage regulating and stabilizing transformer

Abstract

The present invention discloses an SVR online feeder automatic voltage regulating and stabilizing transformer, which relates to the technical field of transformers, including a transformer body, an on-load tap changer is arranged inside the transformer body, the on-load tap changer includes an oil chamber, a tap assembly, a drive sleeve, a pressurizing assembly, a filter assembly and an oil return assembly, the oil chamber is filled with insulating oil, the pressurizing assembly divides the oil chamber into an upper chamber and a lower chamber, the tap assembly is electrically connected to the transformer coil, and is used to adjust the output voltage of the transformer, and the pressurizing assembly includes an inclined slot sleeve, a sliding sleeve and a liquid permeable plate. The present invention reduces the generation of arcs when switching the output voltage by setting the tap assembly, and erases the corroded part of the outer side of the output contact, and at the same time, the particulate matter in the insulating oil is filtered and removed by setting the filter assembly, and the filtering effect of the insulating oil is improved by the pressurizing assembly.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, and in particular to an SVR online feeder automatic voltage regulating and stabilizing transformer. Background Art

[0002] SVR online feeder automatic voltage regulating and stabilizing transformer is a kind of power equipment mainly used to automatically adjust the voltage to ensure the stability of the output voltage. Through its automatic voltage regulation function, SVR transformer can effectively improve the voltage quality, reduce line loss and improve the quality of electric energy. The transformer is composed of autotransformer, on-load tap changer and intelligent controller. The voltage regulation effect is achieved by switching coils with different turns through the on-load tap changer.

[0003] The on-load tap changer has a high-voltage environment inside, and an arc will be generated during switching. In order to ensure the stable operation of the equipment, most on-load tap changers are placed in a sealed insulating oil to avoid damage to the on-load tap changer by the arc.

[0004] The on-load tap changer and the regional power supply grid transformer having the on-load tap changer with application number 201980008267.6 relate to an on-load tap changer, comprising: a first selector rod and a second selector rod; a load transfer switch rod; a switching device; a transmission device; wherein the first selector rod, the second selector rod and the load transfer switch rod are arranged in the same line; the transmission device is configured to: cause the selector rod to move in a first direction during the transition from one selector contact to an adjacent selector contact; cause the load transfer switch rod to move in the first direction and in a second direction opposite to the first direction during the transition so as to operate the switching device.

[0005] The above technical solution has some problems during use. The technical solution has no facilities to prevent arc generation during switching. The selector contacts will be corroded after long-term use, affecting the service life. The particulate matter generated by the arc during operation will also affect the tap changer. The deteriorated insulating oil cannot be filtered and processed in time, affecting the stable operation of the on-load tap changer and causing damage to the transformer.

[0006] Therefore, it is necessary to invent an SVR online feeder automatic voltage regulating and stabilizing transformer to solve the above problems. Summary of the invention

[0007] The object of the present invention is to provide an SVR online feeder automatic voltage regulating and stabilizing transformer to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an SVR online feeder automatic voltage regulating and stabilizing transformer, comprising a transformer body, inside which is provided an on-load tap changer, the on-load tap changer comprising an oil chamber, the inside of which is filled with insulating oil, the oil chamber being a hollow closed structure; a tap assembly, which is arranged inside the oil chamber, the tap assembly being electrically connected to a transformer coil; a driving bushing, the outer side of which is connected to a plurality of the tap assemblies and can slide up and down in the oil chamber; a pressurizing assembly, which is sealingly and slidably connected to the inner side of the oil chamber, the pressurizing assembly dividing the oil chamber into an upper chamber and a lower chamber; the pressurizing assembly The pressing component includes an inclined groove sleeve, a cam groove is formed on the outer side of the inclined groove sleeve; a sliding sleeve, which is slidably sleeved on the outer side of the inclined groove sleeve and is fixedly connected with a pushing boss on the inner side, and the pushing boss is placed in the cam groove; a liquid-permeable plate, which is fixedly connected to the outer side of the sliding sleeve and is connected with a plurality of extension tubes at the upper end, and a partition membrane is fixedly connected to the lower end of the liquid-permeable plate; an extrusion part, whose upper end is fixedly connected to the top of the oil chamber and whose lower end is in contact with the liquid-permeable plate; a filter component, which is fixedly connected to the inner bottom of the oil chamber; and an oil return component, whose lower end is connected with the lower chamber through the filter component and whose upper end is connected with the upper chamber.

[0009] Preferably, it also includes a driving shaft, which is sealed and rotatably connected to the inside of the oil chamber, the inclined groove sleeve is fixedly sleeved on the outside of the driving shaft, and the outside of the driving shaft is fixedly connected with a driving boss; a lifting screw groove is opened on the inside of the driving sleeve, and the driving boss is placed in the lifting screw groove, and the lifting screw groove is composed of a plurality of smooth sections and lifting sections, the smooth sections and the lifting sections are connected end to end, and each of the branch components is connected to the driving sleeve.

[0010] Preferably, the tapping assembly includes a fixed sleeve, on the inner side of which a plurality of contact segments and a plurality of erasing segments are fixedly connected, and the contact segments and the erasing segments are alternately arranged; a switching rod, which is slidably sleeved on the inner side of the fixed sleeve, and the upper end of which is connected to the driving sleeve; an output contact, which is fixedly sleeved on the outer side of the switching rod and can contact with the contact segment to make the circuit conductive; a transition contact, which is placed on one side of the output contact and is electrically connected to the output contact by a transition resistor; an oil guide groove, which is longitudinally opened on the inner side of the fixed sleeve, and the top is connected to the outer side of the fixed sleeve; a drain groove, which is fixedly connected to the bottom of the fixed sleeve, the lower end of the oil guide groove is connected to the drain groove, and a nozzle is provided on one side of the drain groove, and the nozzle corresponds to the filter assembly.

[0011] Preferably, the filter assembly includes a filter frame, which is fixedly mounted on the inner side of the oil chamber and passes through the bottom of the oil chamber; a filter element, which is fixedly mounted on the filter frame, the filter element is a double-layer structure, and the inner side of the inner layer of the filter element is slidably connected with a scraper ring, which is fixedly connected to the outer side of the drive sleeve; a scraper, which is sleeved on the outer side of the outer layer of the filter element and fixedly connected to the drive sleeve; a dirt collecting trough, which is fixedly connected to the bottom of the oil chamber and sleeved on the outer side of the filter element, and the inner side of the inner layer of the filter element is connected to the dirt collecting trough.

[0012] Preferably, the oil return assembly includes an oil return groove, which is fixedly connected to the lower end of the oil chamber and corresponds to the filter frame; a pressure-stabilizing tank, which is fixedly connected to the top of the oil chamber and communicated with the upper chamber, a pressure-stabilizing plate is sealingly and slidably connected to the inner side of the pressure-stabilizing tank, and a one-way valve that can only flow liquid to the upper chamber is fixedly connected to the bottom of the pressure-stabilizing tank; a connecting pipe, which is connected between the pressure-stabilizing tank and the oil return groove, and a control valve is fixedly connected to the middle of the connecting pipe.

[0013] Preferably, it also includes a stepper motor, which is fixedly mounted on the upper end of the oil chamber, and the output shaft is fixedly connected to the driving shaft.

[0014] Preferably, it further comprises partition plates, which are evenly distributed on the outside of the filter element and fixedly connected to the inner wall of the oil chamber, and the partition plates and the tapping assemblies are alternately arranged.

[0015] Preferably, the tapping assembly also includes a torsion bar, which is rotatably connected to the inner side of the switching rod; a connecting rod, which is rotatably connected to the lower end of the torsion bar and is evenly distributed in multiple numbers; a locking rod, which is slidably connected to the switching rod and is rotatably connected to the corresponding connecting rod, and the locking rod can slide into the upper end of the oil guide groove and lock the position of the switching rod; a separation bevel, which is opened on the outer side of the upper end of the torsion bar; a positioning boss, which is placed in the separation bevel and can slide along the separation bevel, and the positioning boss is fixedly connected to the drive sleeve.

[0016] Preferably, the pressurizing assembly also includes a pressurizing plate, which is sealingly and slidably connected in the oil chamber and is placed at the upper end of the liquid-permeable plate, and each of the extension tubes passes through the pressurizing plate; a push rod, which is fixedly connected to the lower end of the pressurizing plate and passes through the liquid-permeable plate, the push rod is sealingly and slidably connected to the liquid-permeable plate, and the push rod corresponds to the driving sleeve in the vertical direction; a pressure-stabilizing tube, which is fixedly connected to the upper end of the pressurizing plate and passes through the upper end of the oil chamber, the pressure-stabilizing tube is sealingly and slidably connected to the oil chamber, a limiting ring is fixedly connected inside the pressure-stabilizing tube, a plurality of air holes are provided in the middle of the limiting ring, and a rubber membrane is fixedly connected to the lower end of the limiting ring; a pressure relief rod, which passes through the limiting ring and is fixedly connected to the liquid-permeable plate, a pressure relief groove is provided on the inner side of the pressure relief rod, and both ends of the pressure relief groove pass through the side wall of the pressure relief rod.

[0017] Preferably, it also includes a pressurizing screw groove, which is opened on the inner side of the driving sleeve and communicated with the lifting screw groove.

[0018] Technical effects and advantages of the present invention:

[0019] 1. The present invention sets a tap assembly and a partition plate, so that the transformer can avoid arcing caused by the selector contacts being too close when switching. Due to the design of the erasing segment and the contact segment, there is a gap between two adjacent contacts, and the inner diameter of the erasing segment is smaller than the inner diameter of the contact segment, so as to avoid the generation of arcs during switching. At the same time, due to the setting of the partition plate, the tap assembly is separated to prevent the arc generated when switching the output voltage from being affected by the close distance. Adding the erasing segment and the partition segment can effectively reduce the generation of arcs.

[0020] 2. The present invention arranges an erasing segment on the outside of the output contact so that when the output contact passes through the erasing segment, the corroded portion of the output contact can be cleared by the erasing segment, thereby preventing an arc generated when the output contact is separated from the contact segment due to corrosion, reducing the corrosion of the selector contact after long-term use, and extending the service life of the transformer.

[0021] 3. The present invention provides a filter assembly and a pressurizing assembly so that the insulating oil in the on-load tap changer can filter out solid particles in the oil body through the filter element and prevent the solid particles from affecting the switching of the output contacts. At the same time, when the output voltage is switched, the oil pressure at the filter assembly can be increased through the pressurizing assembly to improve the filtering effect of the oil, avoid the particulate matter generated by the arc during operation from affecting the tap changer, and avoid the problem that the deteriorated insulating oil cannot be filtered.

[0022] 4. The present invention further increases the internal oil pressure of the on-load tap changer in the transformer by providing a pressure plate and a pressure screw groove, thereby improving the filtering effect of the oil. When the equipment is running at high load, the pressure of the internal oil can be continuously increased to achieve the purpose of cooling the insulating oil, so that the on-load tap changer can operate stably and avoid damage to the transformer caused by deformation of the contacts due to high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 It is a schematic diagram of the overall structure of the on-load tap changer of the present invention.

[0025] Figure 3 It is a cross-sectional view of the on-load tap changer of the present invention.

[0026] Figure 4 It is a schematic diagram of the structure of the pressurizing component in the present invention.

[0027] Figure 5 For the present invention Figure 4 A partial enlarged schematic diagram of area A in the middle.

[0028] Figure 6 It is a schematic diagram of the expansion of the chute casing in the present invention.

[0029] Figure 7 It is a front view of a cross-sectional view of the on-load tap changer of the present invention.

[0030] Figure 8 It is a schematic diagram of the expansion of the driving sleeve in the present invention.

[0031] Fig. 9 It is a cross-sectional view of the tapping assembly in the present invention.

[0032] Fig.10 For the present invention Fig. 9 A partial enlarged schematic diagram of area B in the middle.

[0033] Fig.11 It is a schematic diagram of the structure of the tapping assembly in the present invention.

[0034] Fig.12 It is a schematic diagram of the structure of the filter assembly in the present invention.

[0035] Fig.13 It is a schematic diagram of the limiting structure of the switching rod in the present invention.

[0036] In the figure: 1. transformer body; 2. on-load tap changer; 3. oil chamber; 4. tap assembly; 5. drive sleeve; 6. pressurizing assembly; 7. upper chamber; 8. lower chamber; 9. filter assembly; 10. oil return assembly; 11. driving shaft; 12. drive boss; 13. lifting screw groove; 14. stepping motor; 15. partition plate; 40. fixed sleeve; 41. contact segment; 42. erasing segment; 43. switching rod; 44. output contact; 45. transition contact; 46. transition resistor; 47. oil guide groove; 48. drain groove; 49. torsion bar; 50. connecting rod; 51. locking rod; 52. separation chute; 53. positioning boss; 130 , smooth section; 131, lifting section; 132, pressurized screw groove; 60, inclined groove sleeve; 61, cam groove; 62, sliding sleeve; 63, pushing boss; 64, permeable plate; 65, extension tube; 66, partition membrane; 67, extrusion part; 68, pressurized plate; 69, push rod; 70, pressure-stabilizing tube; 71, limit collar; 72, air hole; 73, rubber membrane; 74, pressure relief rod; 75, pressure relief groove; 90, filter frame; 91, filter element; 92, scraper ring; 93, scraper; 94, sewage collecting tank; 100, oil return tank; 101, pressure-stabilizing tank; 102, pressure-stabilizing plate; 103, one-way valve; 104, connecting pipe; 105, control valve. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1, the present invention provides as follows Figure 1-Figure 12An SVR online feeder automatic voltage regulating and stabilizing transformer is shown, comprising a transformer body 1, inside of which is provided an on-load tap changer 2, and also comprising a UPS power supply, an intermediate relay, an undervoltage and overvoltage protection relay, and an automatic controller, which are not shown in the drawings. The on-load tap changer 2 comprises an oil chamber 3, inside of which is filled with insulating oil, and the oil chamber 3 is a hollow closed structure; a tap assembly 4, which is placed inside the oil chamber 3, in multiple numbers and evenly distributed, and is electrically connected to the transformer coil for adjusting the output voltage of the transformer; a drive sleeve 5, the outer side of which is fixedly connected to multiple tap assemblies 4, and can slide up and down in the oil chamber 3, and a plurality of flat brackets extend from the upper part of the drive sleeve 5, so that it corresponds to the tap assembly 4 and is fixedly connected; a pressurizing assembly 6, which is sealingly and slidably connected to the inner side of the oil chamber 3, and the pressurizing assembly 6 will The oil chamber 3 is divided into an upper chamber 7 and a lower chamber 8. The pressurizing component 6 is used to adjust the internal pressures of the upper chamber 7 and the lower chamber 8. The tapping component 4 is placed in the lower chamber 8. The filtering component 9 is fixedly connected to the inner bottom of the oil chamber 3 and placed in the lower chamber 8 to filter the insulating oil in the oil chamber 3. When the pressure in the lower chamber 8 increases, the insulating oil can better penetrate the filtering component 9. The oil return component 10 has a lower end connected to the lower chamber 8 through the filtering component 9 and an upper end connected to the upper chamber 7. The oil return component 10 transports the filtered insulating oil to the upper chamber 7 to extend the service life of the insulating oil.

[0039] Specifically, the pressurizing component 6 includes an inclined groove sleeve 60, the outer side of which is provided with a cam groove 61; a sliding sleeve 62, which is slidably sleeved on the outer side of the inclined groove sleeve 60 and slides in a sealed manner with the inclined groove sleeve 60, and is fixedly connected to a pushing boss 63 on the inner side, and the pushing boss 63 is placed in the cam groove 61. During use, the inclined groove sleeve 60 rotates and the pushing boss 63 drives the sliding sleeve 62 to slide upward through the cam groove 61; a liquid-permeable plate 64, which is fixedly connected to the outer side of the sliding sleeve 62, and the upper end of which is connected to a plurality of extension tubes 65, the upper ends of the extension tubes 65 are placed in the upper chamber 7, and the lower ends of the extension tubes 65 are connected to the lower chamber 8, and the lower end of the liquid-permeable plate 64 is fixedly connected to a partition membrane 66, which partitions The membrane 66 is placed at the opening position of the lower end of the extension tube 65, and the extrusion part 67, the upper end of which is fixedly connected to the top of the oil chamber 3, and the lower end is in contact with the liquid permeable plate 64. The extrusion part 67 can be a spring, or other elastic deformable materials that can be reset after being subjected to force; when the liquid permeable plate 64 slides upward, the insulating oil in the upper chamber 7 is squeezed and enters the lower chamber 8 through the extension tube 65, and at the same time, the insulating oil pushes the partition membrane 66 to separate from the liquid permeable plate 64. When the liquid permeable plate 64 moves downward, the partition membrane 66 fits with the liquid permeable plate 64, and the insulating oil in the lower chamber 8 cannot enter the upper chamber 7 through the extension tube 65. At this time, the liquid permeable plate 64 continues to slide downward under the push of the extrusion part 67, so that the internal pressure of the lower chamber 8 increases.

[0040] It should be noted that after the push cam is placed at the highest point of the cam groove 61 , the driving shaft 11 rotates under the influence of the squeezing portion 67 , so that the liquid-permeable plate 64 can slide downward.

[0041] Specifically, it also includes a driving shaft 11, which is sealed and rotatably connected to the inner side of the oil chamber 3, and the inclined groove sleeve 60 is fixedly sleeved on the outer side of the driving shaft 11. The rotation of the driving shaft 11 causes the inclined groove sleeve 60 to rotate, and then the liquid-permeable plate 64 slides up and down by pushing the boss 63. The outer side of the driving shaft 11 is fixedly connected with a driving boss 12; it should be noted that the highest point position of the cam groove 61 and the setting position of the driving boss 12 are symmetrically arranged relative to the axis of the driving shaft 11; the lifting screw groove 13 is opened on the inner side of the driving sleeve 5, and the driving boss 12 is arranged In the lifting screw groove 13, the lifting screw groove 13 is composed of a plurality of smooth sections 130 and lifting sections 131. The two ends of the smooth section 130 are horizontally arranged, and the lifting section 131 is in the shape of a screw groove. The smooth section 130 and the lifting section 131 are connected end to end. Each branch component 4 is connected to the driving sleeve 5. When the driving boss 12 slides in the smooth section 130 of the lifting screw groove 13, the height of the driving sleeve 5 remains unchanged. When the driving boss 12 slides in the lifting section 131 of the lifting screw groove 13, the driving sleeve 5 slides along its axis, thereby driving the branch component 4 to slide.

[0042] More specifically, the tap assembly 4 includes a fixed sleeve 40, on the inner side of which a plurality of contact segments 41 and a plurality of erasure segments 42 are fixedly connected, the contact segments 41 and the erasure segments 42 are alternately arranged, and a gap is provided between them, each contact segment 41 is electrically connected to a different transformer coil, and one side of the contact segment 41 passes through the fixed sleeve 40 for the convenience of connection, and a wiring port is provided; a switching rod 43, which is slidably sleeved on the inner side of the fixed sleeve 40, and the upper end is connected to the driving sleeve 5; an output contact 44, which is fixedly sleeved on the outer side of the switching rod 43, can contact the contact segment 41 to conduct the circuit, and the output contact 44 is electrically connected to the output terminal of the transformer, The switch rod 43 is pulled by the driven sleeve 5 to slide up and down so that the output contact 44 switches the upper and lower positions, and the output contact 44 contacts different contact segments 41, so as to achieve the purpose of changing the output voltage of the transformer; the inner diameter of the erasing segment 42 is smaller than the inner diameter of the contact segment 41, so that when the output contact 44 passes through the erasing segment 42, the erased segment 42 can clear the corroded part of the output contact 44, so as to prevent the arc generated when the output contact 44 is separated from the contact segment 41 due to corrosion, and at the same time, the setting of the erasing segment 42 can extend the distance between the two contact segments 41, so as to further reduce the generation of arc; the transition contact 45 is placed on one side of the output contact 44 and is in contact with the output A transition resistor 46 is electrically connected between the output contacts 44. In order to avoid power failure of the lower equipment of the transformer during switching, when the switching rod 43 drives the output contact 44 to slide upward, when the output contact 44 is not completely separated from the currently corresponding contact segment 41, the transition contact 45 contacts the next contact segment 41. At this time, the two contact segments 41 output electrical energy to it, and the transition resistor 46 keeps the output stable to prevent the transformer from burning out; when the switching rod 43 continues to rise, the output contact 44 contacts the next contact segment 41, and the transition contact 45 separates from the contact segment 41, so that the transformer can output the voltage generated by the coil connected to the current contact segment 41; The oil guide groove 47 is longitudinally opened on the inner side of the fixed sleeve 40, and the top is connected to the outer side of the fixed sleeve 40. The oil guide groove 47 is connected to the inner side of the fixed sleeve 40 at the position between each contact section 41 and the erasing section 42. When the switching rod 43 slides up and down to adjust the position of the output contact 44, the insulating oil in the fixed sleeve 40 flows, so that the particles generated by the arc and the deteriorated insulating oil in the fixed sleeve 40 can be better discharged out of the fixed sleeve 40; the sewage groove 48 is fixedly connected to the bottom of the fixed sleeve 40, the lower end of the oil guide groove 47 is connected to the sewage groove 48, and a nozzle is provided on one side of the sewage groove 48, and the nozzle corresponds to the filter component 9.

[0043] During use, the solid particles generated by the electric arc in the fixed sleeve 40 fall into the drain trough 48 due to gravity. When the switching rod 43 slides downward, the lower end of the switching rod 43 pushes the filtered oil in the fixed sleeve 40 into the drain trough 48 and the oil guide groove 47. Since the opening cross-section of the oil guide groove 47 is smaller than the opening cross-section of the inner side of the fixed sleeve 40, more insulating oil can be discharged through the inner side of the fixed sleeve 40. The insulating oil inside the fixed sleeve 40 is discharged to the outside of the fixed sleeve 40 through the nozzle position of the drain trough 48. At the same time, the insulating oil pushes the solid particles inside the drain trough 48 to be discharged to a position close to the filter assembly 9.

[0044] Specifically, the filter assembly 9 includes a filter frame 90, which is fixedly mounted on the inner side of the oil chamber 3 and passes through the bottom of the oil chamber 3; a filter element 91, which is fixedly mounted on the filter frame 90, and the filter element 91 is a double-layer structure, and the output position after filtration is between the double-layer filter element 91, and the inner side of the inner layer of the filter element 91 is slidably connected with a scraper ring 92, which is fixedly connected to the outer side of the drive sleeve 5. The scraper ring 92 is driven by the up and down sliding of the drive sleeve 5 to scrape off the solid particles adsorbed on the inner side of the filter element 91, and push the solid particles into the inner side of the filter frame 90. At the same time, the arrangement of the scraper ring 92 and the inner filter element 91 also guides the up and down sliding of the drive sleeve 5; the scraper 93, which is sleeved on the outer side of the outer layer of the filter element 91 and fixedly connected to the drive sleeve 5. When the drive sleeve 5 slides up and down, the scraper 93 is used to scrape off the solid particles adsorbed on the outer side of the filter element 91; the dirt collecting tank 94 is fixedly connected to the bottom of the oil chamber 3 and sleeved on the outer side of the filter element 91. The inner side of the inner layer of the filter element 91 is connected to the dirt collecting tank 94. The top of the dirt collecting tank 94 is sunken, so that the solid particles entering are not easy to be discharged. During use, the scraper 93 and the scraper ring 92 push the solid particles adsorbed by the filter element 91 to the lower end of the filter element 91 and enter the dirt collecting tank 94 to prevent a large amount of solid particles from mixing into the insulating oil and causing oil quality deterioration.

[0045] More specifically, the oil return assembly 10 includes an oil return groove 100, which is fixedly connected to the lower end of the oil chamber 3 and corresponds to the filter frame 90; a pressure-stabilizing tank 101, which is fixedly connected to the top of the oil chamber 3 and communicated with the upper chamber 7. A pressure-stabilizing plate 102 is sealingly and slidably connected to the inner side of the pressure-stabilizing tank 101, and a one-way valve 103 that can only flow liquid to the upper chamber 7 is fixedly connected to the bottom of the pressure-stabilizing tank 101. The pressure-stabilizing tank 101 is used to compensate for the insulating oil in the upper chamber 7 so that the pressure value in the upper chamber 7 is maintained stable; a connecting pipe 104, which is connected between the pressure-stabilizing tank 101 and the oil return groove 100. During use, the pressure in the lower chamber 8 increases, so that the insulating oil can better penetrate the filter element 91 into the oil return groove 100, and pass through the connecting pipe 104 The insulating oil is re-transported to the pressure-stabilizing tank 101. The insulating oil in the pressure-stabilizing tank 101 enters the upper chamber 7, which will cause the internal pressure-stabilizing plate 102 to slide downward. When the insulating oil in the connecting pipe 104 is transported to the pressure-stabilizing tank 101, the pressure-stabilizing plate 102 slides upward. The up and down sliding of the pressure-stabilizing plate 102 and the one-way transportation of the insulating oil by the one-way valve 103 keep the pressure in the upper chamber 7 constant. The middle part of the connecting pipe 104 is fixedly connected with a control valve 105. The control valve 105 is an electric flow control valve 105, which is a prior art and will not be described in detail here. During use, the control valve 105 is electrically connected to a controller and a power supply. By adjusting the flow of the control valve 105, the speed of pressure recovery in the lower chamber 8 can be better controlled.

[0046] Specifically, it also includes a stepper motor 14, which is fixedly mounted on the upper end of the oil chamber 3, and the output shaft is fixedly connected to the driving shaft 11. During use, the stepper motor 14 is electrically connected to the controller and the power supply. When the power signal is not connected, the stepper motor 14 can rotate under the influence of the driving shaft 11 to ensure that the liquid-permeable plate 64 can slide downward stably. The partition plates 15 are evenly distributed on the outside of the filter element 91 and are fixedly connected to the inner wall of the oil chamber 3. The partition plates 15 are alternately arranged with the tap assembly 4. The partition plates 15 are made of non-conductive material to separate the tap assembly 4 to prevent the arc generated when switching the output voltage from being affected by the close distance, and the filter element 91 is positioned through the partition plates 15.

[0047] In summary, when the transformer is working, the contact segments 41 of the on-load tap changer 2 are electrically connected to different coils of the transformer, and the output contact 44 is electrically connected to the output end of the transformer. When the transformer switches the output voltage, the driving shaft 11 is rotated by the rotation of the stepper motor 14. At this time, the driving boss 12 slides along the lifting screw groove 13. When the driving boss 12 slides to the lifting segment 131, the driving sleeve 5 slides relative to the tap assembly 4. At this time, the switching rod 43 is pulled up and down by the driving sleeve 5 to make the output contact 44 switch the upper and lower positions, and the output contact 44 is contacted with different contact segments 41, so as to achieve the purpose of changing the output voltage of the transformer. In the switching process, the purpose of stable output is achieved through the cooperation of the transition contact 45 and the transition resistor 46; when the driving boss 12 slides to the smooth segment 130, the height of the driving sleeve 5 is fixed, and the switching of the output voltage is completed; when the output voltage needs to be switched in the reverse direction, the stepper motor 14 can be rotated in the reverse direction through the controller, and the driving boss 12 is adjusted to the smooth segment 130 again.

[0048] When the output voltage is switched, the driving shaft 11 rotates to rotate the inclined groove sleeve 60. At this time, the cam groove 61 causes the pushing boss 63 to drive the sliding sleeve 62 to slide upward. When the pushing boss 63 is placed at the highest point of the cam groove 61, the driving boss 12 is placed in the middle position of the smooth section 130. When the permeable plate 64 slides upward, the insulating oil in the upper chamber 7 is squeezed into the lower chamber 8 through the extension tube 65. At the same time, the insulating oil pushes the partition membrane 66 to separate from the permeable plate 64. After the output voltage is switched, the permeable plate 64 is pushed by the squeezing part 67 to continue to slide downward, so that the internal pressure of the lower chamber 8 increases. At the same time, the oil in the pressure-stabilizing tank 101 will penetrate the one-way valve 103 and enter the upper chamber 7, so that the permeable plate 64 can descend and ensure that the pressure in the upper chamber 7 is constant. The pressure in the lower chamber 8 increases, so that the insulating oil can better pass through the filter element 91 into the oil return groove 100, and re-enter the pressure-stabilizing tank 101 through the connecting pipe 104.

[0049] When the insulating oil penetrates the filter element 91, the solid particles generated by the electric arc in the insulating oil will be blocked by the filter element 91, so that they cannot enter the oil return groove 100. While switching the output voltage, the driving sleeve 5 drives the scraper ring 92 and the scraper plate 93 to slide relative to the filter element 91, so that the solid particles blocked on the outside of the filter element 91 are pushed to a position close to the sewage collecting groove 94 and enter the sewage collecting groove 94 under the influence of gravity, thereby preventing a large amount of solid particles from mixing into the insulating oil and causing oil quality deterioration.

[0050] Embodiment 2, as described above, during the switching process of the on-load tap changer 2, an arc is easily generated at the contact position, causing solid particles to be generated in the insulating oil. At the same time, some acidic substances are also generated to deteriorate the insulating oil, resulting in easy breakdown during use, causing damage to the operation of the transformer. The above embodiment increases the pressure in the lower chamber 8 while switching the output voltage during use, but it is found in actual use that the pressure increase effect is limited, so it is necessary to further increase the pressure in the lower chamber 8 without affecting the stable operation of the equipment and the pressure of the upper chamber 7. For this reason, the relevant components of the device are further improved.

[0051] Specifically, Figure 4-Figure 13 As shown, the tapping assembly 4 also includes a torsion bar 49, which is rotatably connected to the inner side of the switching rod 43; a connecting rod 50, which is rotatably connected to the lower end of the torsion bar 49, and is evenly distributed in multiples; a locking rod 51, which is slidably connected to the switching rod 43, and is rotatably connected to the corresponding connecting rod 50, the locking rod 51 is placed at the bottom of the switching rod 43, the locking rod 51 can slide into the upper end of the oil guide groove 47, the upper end of the oil guide groove 47 passes through the side wall of the fixed sleeve 40, and locks the position of the switching rod 43. During use, the torsion bar 49 rotates through the connecting rod 50 to make the locking rod 51 slide to the upper end of the oil guide groove 47, at which time the vertical height of the switching rod 43 is fixed; a separation inclined groove 52, which is opened on the outer side of the upper end of the torsion bar 49; a positioning boss 53, which is placed in the separation inclined groove 52 and can slide along the separation inclined groove 52, and the positioning boss 53 is fixedly connected to the driving sleeve 5.

[0052] It should be pointed out that the switching rod 43 is slidably connected to the driving sleeve 5. During use, when the driving sleeve 5 slides upward and separates from the switching rod 43, the positioning boss 53 rotates the torsion bar 49 through the separation bevel 52. When the driving sleeve 5 slides downward, the torsion bar 49 is reset and the locking rod 51 slides out of the oil guide groove 47. Then the driving sleeve 5 pushes the switching rod 43 to slide downward.

[0053] It should be noted that when the switch rod 43 has not slid to the upper limit position, the locking rod 51 is restricted by the contact segment 41, the erasing segment 42 and the inner side of the fixed sleeve 40 and cannot slide relative to the switch rod 43, so that the torsion bar 49 cannot rotate relative to the switch rod 43, and further, the driving sleeve 5 will not separate from the switch rod 43 when sliding upward, and can still stably slide the switch rod 43 upward.

[0054] More specifically, the pressurizing assembly 6 further includes a pressurizing plate 68, which is sealingly and slidably connected in the oil chamber 3 and is placed at the upper end of the liquid-permeable plate 64. Each extension tube 65 passes through the pressurizing plate 68, and a closed gap can be generated between the pressurizing plate 68 and the liquid-permeable plate 64. The extrusion portion 67 is placed at the upper end of the pressurizing plate 68; a push rod 69, which is fixedly connected to the lower end of the pressurizing plate 68 and passes through the liquid-permeable plate 64. The push rod 69 is sealingly and slidably connected to the liquid-permeable plate 64. The push rod 69 corresponds to the driving sleeve 5 in the vertical direction, and the driving sleeve 5 can The push rod 69 can be used to create a gap between the pressure plate 68 and the liquid permeable plate 64; the pressure-stabilizing tube 70 is fixedly connected to the upper end of the pressure plate 68 and passes through the upper end of the oil chamber 3. The pressure-stabilizing tube 70 is sealed and slidably connected to the oil chamber 3. A limiting collar 71 is fixedly connected inside the pressure-stabilizing tube 70. A plurality of air holes 72 are opened in the middle of the limiting collar 71. A rubber membrane 73 is fixedly connected to the lower end of the limiting collar 71. The air holes 72 and the rubber membrane 73 form a one-way air intake structure, so that air can only enter the liquid permeable plate 64 and the pressure plate through the air holes 72. The pressure relief rod 74 penetrates the limiting collar 71 and is fixedly connected to the liquid permeable plate 64. A pressure relief groove 75 is provided on the inner side of the pressure relief rod 74. Both ends of the pressure relief groove 75 penetrate the side wall of the pressure relief rod 74. During use, after the switching rod 43 rises to the limit position, the driving sleeve 5 continues to rise and creates a gap between the pressure plate 68 and the liquid permeable plate 64 through the push rod 69. At the same time, air enters the gap through the air hole 72. When the driving sleeve 5 slides downward and resets, the air remains between the pressure plate 68 and the liquid permeable plate 64, and then the extrusion part 67 pushes the pressure plate 68 to make the permeable plate 64 descend synchronously. As the gap between the pressure plate 68 and the permeable plate 64 increases, the pressure in the lower chamber 8 increases, further improving the effect of the insulating oil passing through the filter element 91; when the permeable plate 64 descends to the lower end limit position, the extrusion part 67 continues to push the pressure plate 68 to slide downward, and when the opening position of the upper end of the pressure relief groove 75 slides out of the limiting ring 71, the gas in the pressure plate 68 and the permeable plate 64 is discharged through the pressure relief groove 75.

[0055] Specifically, it also includes a pressurizing screw groove 132, which is opened on the inner side of the driving sleeve 5 and is connected to the lifting screw groove 13. The pressurizing screw groove 132 has a spiral structure. The pressurizing screw groove 132 is placed at the bottom of the lifting screw groove 13. The driving boss 12 can slide along the pressurizing screw groove 132. During use, the height of the driving sleeve 5 is adjusted by the driving boss 12 on the outer side of the driving shaft 11. When the pressure is further increased, the driving shaft 11 continues to be rotated so that the driving boss 12 can enter the pressurizing screw groove 132 and make the driving sleeve 5 slide upward again for a certain distance, so that it pushes the pressurizing plate 68 to slide upward. It should be noted that after the driving boss 12 enters the pressurizing screw groove 132, it further pushes the driving sleeve 5 upward, and then makes the driving boss 12 return to the middle of the smooth section 130 at the lower end, so that the permeable plate 64 can slide downward.

[0056] In summary, when it is necessary to further pressurize the lower chamber 8 to improve the effect of insulating oil penetrating the filter element 91, when the switching rod 43 rises to the upper limit position, the active shaft 11 continues to rotate so that the driving boss 12 can enter the pressurizing screw groove 132 and the driving sleeve 5 slides upward again for a certain distance, and at the same time, the driving sleeve 5 slides upward and separates from the switching rod 43, and the positioning boss 53 rotates the torsion bar 49 through the separation inclined groove 52. At this time, the vertical height of the switching rod 43 is fixed, and a gap is generated between the pressurizing plate 68 and the liquid permeable plate 64 through the push rod 69. At the same time, air enters the gap through the air hole 72, and the air is retained in the pressurizing plate 68 and the liquid permeable plate 64. Then, the extrusion part 67 pushes the pressurizing plate 68 to make the liquid permeable plate 64 descend synchronously. As the gap between the pressurizing plate 68 and the liquid permeable plate 64 increases, the pressure in the lower chamber 8 increases, further improving the filtration of solid particles in the insulating oil. When the opening position at the upper end of the pressure relief groove 75 slides out from the limiting collar 71, the gas in the pressure plate 68 and the liquid permeable plate 64 is discharged through the pressure relief groove 75. At this time, the stepper motor 14 is rotated to drive the boss 12 to enter the pressure screw groove 132 again, so that a gap is generated between the pressure plate 68 and the liquid permeable plate 64 again, and the squeezed portion 67 continues to push the liquid permeable plate 64 to slide downward. At this time, the internal pressure of the lower chamber 8 is increased without switching the output power of the transformer. Repeating this process, the lower chamber 8 can be kept within a certain pressure range at all times, so that the insulating oil can enter the upper chamber 7 through the filter assembly 9 and the oil return assembly 10. During the flow of the insulating oil, the insulating oil can take away the heat in the oil chamber 3, so it can also play a certain role in controlling the temperature in the oil chamber 3, thereby avoiding the inability to switch due to the heat deformation of the contacts when the transformer is working at high power, thereby improving the stability of the transformer operation.

[0057] Embodiment 3, in order to enable the transformer to have the ability of remote wireless operation and control, specifically, the UPS power supply is connected to the transformer and is used to provide AC voltage stabilization when the transformer is normally powered and to charge the internal battery of the UPS power supply through an external power supply. The internal battery is used for DC power when a fault occurs to continue to temporarily maintain normal power supply to the load. At the same time, a signal voltage is provided to the automatic controller, and a control signal is sent through the automatic controller to drive the on-load tap changer to adjust the voltage gear of normal power consumption; the overvoltage and undervoltage protection relay is provided with a locking device, which is used to automatically lock when the line is in an overvoltage or undervoltage state, so that the switch and the controller are in a stable daily operating state; the internal circuit of the SVR online voltage stabilization intelligent controller includes a main control circuit The on-load tapchanger is also provided with a gear protection module for gear upper limit protection, lower limit protection and action time limit protection. The intermediate relay is connected to the internal circuit of the SVR online voltage stabilizing intelligent controller to control multiple lines to eliminate circuit interference and intermediate transmission signals. The automatic controller includes an industrial-grade intelligent operation control chip, a sampling circuit and a communication module. The sampling circuit is used to sample the voltage and current inside the transformer and supply them to the intelligent operation control chip for calculation. The communication module includes short-range communication based on the RS485 communication interface and long-range communication based on the Ethernet physical layer chip, which are used for wireless interaction of signals and commands with the operation end.

[0058] The utility model also comprises a display module, which is used for displaying the number of gear actions of the on-load tap changer, the current gear, the highest gear and the lowest gear indication.

[0059] Remote communication includes remote communication processing module, Ethernet physical layer chip, optical fiber transceiver module, local communication processing module and PCI interface chip, which are used for cloud remote control.

[0060] Short-range communication based on RS485 communication interface is used to view and modify the built-in parameters of the automatic controller within 30m of the installation point. Long-range communication uses Ethernet connection in combination with remote mobile operation terminal or remote control center to realize Internet of Things applications.

[0061] The intelligent computing control chip tracks the changes in the input and output of the transformer through a sampling circuit, samples them for calculation, and adjusts the voltage reference, action delay, allowable range, and number limit according to the calculation results, and automatically adjusts the on-load tap changer position.

[0062] The SVR online voltage stabilizing intelligent controller uses the automatic adjustment device body ratio to control the output voltage stability. The maximum adjustment range of its working voltage is 30% to +10%, and it automatically adjusts to keep the input voltage within the maximum range of ±20%.

[0063] The transformer adopts a fully sealed corrugated oil tank with oil temperature indicator and pressure relief valve. A three-phase four-wire power supply is installed in the oil tank to provide sampling signals and working power for the automatic controller.

[0064] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An SVR online feeder automatic voltage regulating and stabilizing transformer, comprising a transformer body, inside of which is provided an on-load tap changer, characterized in that: The on-load tap changer comprises an oil chamber filled with insulating oil, and the oil chamber is a hollow closed structure; A tap assembly is placed inside the oil chamber, and the tap assembly is electrically connected to the transformer coil; A driving sleeve, the outer side of which is connected to the plurality of tapping assemblies and is capable of sliding up and down in the oil chamber; A pressurizing component, which is sealingly and slidably connected to the inner side of the oil chamber, and the pressurizing component divides the oil chamber into an upper chamber and a lower chamber; the pressurizing component includes an inclined groove sleeve, and a cam groove is opened on the outer side of the inclined groove sleeve; a sliding sleeve, which is slidably sleeved on the outer side of the inclined groove sleeve, and a pushing boss is fixedly connected to the inner side, and the pushing boss is placed in the cam groove; a liquid-permeable plate, which is fixedly connected to the outer side of the sliding sleeve, and a plurality of extension tubes are connected to the upper end, and a partition membrane is fixedly connected to the lower end of the liquid-permeable plate; an extrusion part, whose upper end is fixedly connected to the top of the oil chamber, and the lower end is in contact with the liquid-permeable plate; A pressure plate, which is sealingly and slidably connected in the oil chamber and is placed on the upper end of the liquid-permeable plate, and each of the extension tubes passes through the pressure plate; A push rod, which is fixedly connected to the lower end of the pressure plate and passes through the liquid-permeable plate, the push rod is sealingly and slidably connected to the liquid-permeable plate, and the push rod corresponds to the driving sleeve in a vertical direction; A pressure-stabilizing tube, which is fixedly connected to the upper end of the pressure plate and passes through the upper end of the oil chamber. The pressure-stabilizing tube is sealingly and slidingly connected to the oil chamber. A limiting collar is fixedly connected inside the pressure-stabilizing tube. A plurality of air holes are opened in the middle of the limiting collar. A rubber membrane is fixedly connected to the lower end of the limiting collar. A filter assembly fixedly connected to the inner bottom of the oil chamber; The oil return assembly has a lower end connected to the lower chamber through the filter assembly, and an upper end connected to the upper chamber.

2. The SVR online feeder automatic voltage regulating and stabilizing transformer according to claim 1 is characterized in that: It also includes a driving shaft, which is sealed and rotatably connected to the inner side of the oil chamber, the inclined groove sleeve is fixedly sleeved on the outer side of the driving shaft, and the outer side of the driving shaft is fixedly connected to a driving boss; The lifting screw groove is opened on the inner side of the driving sleeve, the driving boss is placed in the lifting screw groove, the lifting screw groove is composed of a plurality of smooth sections and lifting sections, the smooth sections and the lifting sections are connected end to end, and each of the branching components is connected to the driving sleeve.

3. The SVR online feeder automatic voltage regulating and stabilizing transformer according to claim 1 is characterized in that: The tapping assembly comprises a fixed sleeve, a plurality of contact segments and a plurality of erasing segments are fixedly connected to the inner side of the fixed sleeve, and the contact segments and the erasing segments are alternately arranged; A switching rod, which is slidably sleeved inside the fixed sleeve and the upper end of which is connected to the driving sleeve; An output contact, which is fixedly sleeved on the outer side of the switching rod and can contact with the contact segment to conduct the circuit; A transition contact, which is disposed on one side of the output contact and is electrically connected to the output contact via a transition resistor; An oil guide groove is longitudinally opened on the inner side of the fixed sleeve and the top of the oil guide groove is connected with the outer side of the fixed sleeve; A drain trough is fixedly connected to the bottom of the fixed sleeve, the lower end of the oil guide groove is communicated with the drain trough, and a nozzle is provided on one side of the drain trough, and the nozzle corresponds to the filter assembly.

4. The SVR online feeder automatic voltage regulating and stabilizing transformer according to claim 1 is characterized in that: The filter assembly includes a filter frame, which is fixedly mounted on the inner side of the oil chamber and passes through the bottom of the oil chamber; A filter element, which is fixedly mounted on the filter frame, the filter element is a double-layer structure, and a scraper ring is slidably connected to the inner side of the inner layer of the filter element, and the scraper ring is fixedly connected to the outer side of the drive sleeve; A scraper, which is sleeved on the outer side of the outer layer of the filter element and fixedly connected to the driving sleeve; The dirt collecting tank is fixedly connected to the bottom of the oil chamber and is sleeved on the outside of the filter element. The inner side of the inner layer of the filter element is communicated with the dirt collecting tank.

5. The SVR online feeder automatic voltage regulating and stabilizing transformer according to claim 4 is characterized in that: The oil return assembly includes an oil return groove, which is fixedly connected to the lower end of the oil chamber and corresponds to the filter frame; A pressure stabilizing tank, which is fixedly connected to the top of the oil chamber and communicated with the upper chamber, a pressure stabilizing plate is sealingly and slidably connected to the inner side of the pressure stabilizing tank, and a one-way valve that can only flow liquid to the upper chamber is fixedly connected to the bottom of the pressure stabilizing tank; A connecting pipe is connected between the pressure stabilizing tank and the oil return tank, and a control valve is fixedly connected to the middle of the connecting pipe.

6. The SVR online feeder automatic voltage regulating and stabilizing transformer according to claim 2 is characterized in that: It also includes a stepper motor, which is fixedly mounted on the upper end of the oil chamber, and the output shaft is fixedly connected to the driving shaft.

7. The SVR online feeder automatic voltage regulating and stabilizing transformer according to claim 4 is characterized in that: It also includes partition plates, which are evenly distributed on the outside of the filter element and fixedly connected to the inner wall of the oil chamber. The partition plates and the tapping components are alternately arranged.

8. The SVR online feeder automatic voltage regulating and stabilizing transformer according to claim 3 is characterized by: The tap assembly also includes a torsion bar, which is rotatably connected to the inner side of the switch rod; A connecting rod, which is rotatably connected to the lower end of the torsion bar and is evenly distributed in plurality; A locking rod, which is slidably connected to the switching rod and is rotationally connected to the corresponding connecting rod, and the locking rod can slide into the upper end of the oil guide groove and lock the position of the switching rod; A separation inclined groove is provided on the outer side of the upper end of the torsion bar; A positioning boss is disposed in the separation chute and is capable of sliding along the separation chute; the positioning boss is fixedly connected to the drive sleeve.

9. The SVR online feeder automatic voltage regulating and stabilizing transformer according to claim 1, characterized in that: The pressurizing assembly further comprises a pressure relief rod which passes through the limiting collar and is fixedly connected to the liquid-permeable plate. A pressure relief groove is provided on the inner side of the pressure relief rod, and both ends of the pressure relief groove pass through the side wall of the pressure relief rod.

10. The SVR online feeder automatic voltage regulating and stabilizing transformer according to claim 2, characterized in that: It also includes a pressurizing screw groove, which is opened on the inner side of the driving sleeve and communicated with the lifting screw groove.

Images