Oil-immersed transformer winding compression force automatic adjusting device and early warning system

Abstract

The application provides an oil-immersed transformer winding compression force automatic adjusting device and early warning system, the oil-immersed transformer winding compression force automatic adjusting device comprises a plurality of housings between the limb plate and the pressing plate of the clamp, a bottom hole is formed in the bottom of the housing, a disc spring string is arranged in the housing, a piston column is arranged in the disc spring string, the bottom end of the piston column penetrates through the bottom hole and is compressed on the pressing plate, the top end of the disc spring string is fixed with the housing, the bottom end of the disc spring string is fixed with the piston column, a limiting mechanism for limiting the disc spring string in a compressed state is arranged on the housing, an automatic sensing system connected with the limiting mechanism is arranged below the pressing plate, the automatic sensing system is used for monitoring the winding compression force and controlling the limiting mechanism to release the compression limitation on the disc spring string, the winding compression force is monitored in real time through the automatic sensing system, the automatic adjustment of the winding compression force is realized, the monitoring efficiency and the adjusting efficiency of the winding compression force are improved, and the ability of the transformer to resist external short-circuit impact is enhanced.

Description

Technical Field

[0001] This invention belongs to the technical field of transformer process improvement, and more specifically, it relates to an automatic adjustment device and early warning system for the winding clamping force of an oil-immersed transformer. Background Technology

[0002] As a crucial component of the power transmission system, the stable operation of power transformers is vital to the entire power system. However, prolonged operation of power transformers can lead to various issues such as changes in the mechanical strength of the conductors / insulators, external short-circuit impacts, and long-term full-load operation, resulting in loosening of the windings and increased spacing between coils. This can cause significant changes in the leakage magnetic field distribution inside the transformer, and in severe cases, even cause the internal conductors to tilt, which is extremely detrimental to the long-term stable operation of the power transformer.

[0003] Currently, the main method to solve the problem of loose windings in power transformers is to rely on a power transformer winding looseness defect diagnosis system for monitoring, such as: low voltage pulse method, frequency response analysis method, short circuit reactance method, vibration signal analysis method, and then to perform equipment cover treatment, and manually adjust the pressure nails set on the clamping plate inside the transformer so that the pressure nails press down on the annular pressure plate set on the winding coil, and the pressure plate moves down to adjust the winding clamping force.

[0004] However, the above-mentioned methods are time-consuming and labor-intensive. If minor winding loosening is not monitored and addressed in time, it will evolve into winding deformation. In severe cases, it will cause damage to the insulation of the transformer, leading to accidents such as leakage and short circuit, which seriously threatens the safe and stable operation of the power grid. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic adjustment device and early warning system for the winding clamping force of an oil-immersed transformer, so as to solve the technical problem that the existing technology has time-consuming and labor-intensive processing methods, and that once a minor degree of winding loosening is not monitored and dealt with in time, it will evolve into a serious safety problem caused by winding deformation.

[0006] To achieve the above objectives, in a first aspect, the technical solution adopted by the present invention is as follows: An automatic adjustment device for the winding clamping force of an oil-immersed transformer is provided, comprising multiple housings arranged in a ring between a clamping plate and a pressure plate. The top of each housing is fixed to the clamping plate, and a bottom hole is provided at the bottom of each housing. A string of disc springs is disposed within each housing, and a piston rod is disposed inside the string of disc springs. The bottom end of the piston rod passes through the bottom hole and presses against the pressure plate. The top of the string of disc springs is fixed to the housing, and the bottom end of the string of disc springs is fixed to the piston rod. A limiting mechanism is provided on the housing to restrict the string of disc springs to a compressed state. An automatic sensing system connected to the limiting mechanism is disposed below the pressure plate. The automatic sensing system is used to monitor the winding clamping force and control the limiting mechanism to release the compression restriction on the string of disc springs.

[0007] In conjunction with the first aspect, in one possible implementation, the side of the housing has several micro-holes, each of which contains an insulating diaphragm. The piston rod is sealed to the bottom hole. The housing is filled with transformer oil, and the pressure inside the housing is greater than the pressure outside the housing. A striking pin mechanism is located on one side of the housing below the clamping plate. The striking pin mechanism is used to puncture all the insulating diaphragms. An automatic sensing system is connected to the striking pin mechanism and is used to control the striking pin mechanism to reset after puncturing the insulating diaphragms.

[0008] In conjunction with the first aspect, in one possible implementation, the firing pin mechanism includes a first protective shell, a movable plate, movable pins, and a pushing assembly. The first protective shell is fixed below the clamping limb plate. The movable plate is slidably disposed within the first protective shell. There are multiple movable pins, which are fixed on the movable plate. The outer ends of the movable pins protrude from the first protective shell and are positioned opposite to the corresponding micro-holes. The pushing assembly is disposed within the first protective shell and is used to drive the movable plate to move toward the shell.

[0009] In conjunction with the first aspect, in one possible implementation, the limiting mechanism includes telescopic hooks and a drive assembly. There are two sets of telescopic hooks located on opposite sides of the disc spring string, and two sets of drive assemblies corresponding to the telescopic hooks. The top end of the telescopic hook is fixed to the inner top wall of the housing, and the bottom end of the telescopic hook is hooked to the bottom end of the disc spring string. The drive assembly is used to adjust the telescopic length of the telescopic hook.

[0010] In conjunction with the first aspect, in one possible implementation, the telescopic hook includes an outer tube and an inner hook. The outer tube is fixed to the top wall inside the housing. One end of the inner hook is slidably disposed inside the outer tube, and the other end of the inner hook is hooked to the bottom end of the disc spring string. The driving assembly is used to drive the inner hook to slide inside the outer tube. A buffer assembly is provided on the housing to slow down the stretching speed of the disc spring string when the inner hook descends to extend and reset. The telescopic hook is provided with a positioning assembly to fix the inner hook in any position.

[0011] In conjunction with the first aspect, in one possible implementation, the drive assembly includes a second protective shell, a drive motor, a drive shaft, a gear, and a rack; the second protective shell is fixed to one side of the housing, the drive motor is disposed inside the second protective shell, the drive shaft is coaxially fixed to the output shaft of the drive motor and extends into the housing; a first cavity is provided inside the outer tube, the gear is rotatably connected to the first cavity and coaxially fixed to the drive shaft, and the rack is fixed to one side of the inner hook and meshes with the gear.

[0012] In conjunction with the first aspect, in one possible implementation, the buffer assembly includes a buffer spring, a buffer block, and a buffer magnet; a buffer groove is formed on the side wall of the bottom hole, the buffer spring is disposed in the buffer groove, and the buffer block slides at the opening of the buffer groove and is connected to the buffer spring; multiple slots are equidistantly formed on the side wall of the piston rod along its length direction, and when the buffer spring is in its natural state, the buffer block is simultaneously located in the buffer groove and the slots; the upper surface of the buffer block located in the slot is inclined, and the buffer magnet is fixedly attached to the inclined surface of the buffer block; the piston rod is made of metal and is held in place by the buffer magnet.

[0013] In conjunction with the first aspect, in one possible implementation, the positioning component includes a third protective shell, a drive cylinder, a pawl, and a ratchet; the third protective shell is fixed to one side of the housing, the drive cylinder is disposed inside the third protective shell, one end of the drive cylinder extends into the housing and is connected to the rotating shaft of the pawl; a second cavity is provided inside the outer tube, the pawl is rotatably connected to the second cavity, and the rotating shaft of the pawl is slidably disposed in the second cavity along its own length direction; the ratchet is fixed on the inner hook and engages with the pawl; the drive cylinder is used to drive the pawl to engage or disengage with the ratchet; when the pawl engages with the ratchet, the ratchet cannot move downward.

[0014] In conjunction with the first aspect, in one possible implementation, the automatic sensing system includes a first force sensor and a first controller. The first force sensor is disposed below the pressure plate and is used to monitor the winding clamping force. The signal output terminal of the first force sensor is connected to the signal input terminal of the first controller. When the clamping force value detected by the first force sensor is less than a preset value, an abnormal signal is output. The signal output terminal of the first controller is connected to the limiting mechanism and the striking pin mechanism. When the first controller receives the abnormal signal, the first controller controls the limiting mechanism to release the compression restriction on the disc spring string and controls the striking pin mechanism to puncture the insulating diaphragm and then reset it.

[0015] Secondly, the technical solution adopted by the present invention is as follows: An automatic early warning system for the winding clamping force of an oil-immersed transformer is provided, comprising a timer, a second force-sensitive sensor, a second controller, and an alarm. The signal input terminal of the timer is connected to the signal output terminal of the first controller. When the first controller receives the abnormal signal, it outputs a timing signal to the timer. When the timer receives the timing signal, it starts timing. When the timing reaches a preset time value, the timer outputs an arrival signal. The second force-sensitive sensor is connected to the output terminal of the timer and receives the arrival signal. When the second force-sensitive sensor receives the arrival signal, it detects the winding clamping force. When the clamping force detected by the second force-sensitive sensor is less than a preset value, it outputs a danger signal. The second controller is connected to the second force-sensitive sensor and receives the danger signal. When the second controller receives the danger signal, it outputs an alarm signal. The alarm is connected to the second controller and sounds an alarm when it receives the alarm signal.

[0016] The beneficial effects of the automatic adjustment device for winding clamping force of oil-immersed transformer provided by the present invention are as follows: Compared with the prior art, the present invention monitors the winding clamping force in real time through an automatic sensing system, and controls all limiting mechanisms to release the compression restriction on the disc spring strings when an abnormal winding clamping force is detected. At this time, all disc spring strings extend and reset, and the disc spring strings drive the corresponding piston columns to press down the pressure plate, thereby realizing the automatic adjustment of the winding clamping force. There is no need for lifting the cover, which improves the monitoring efficiency and adjustment efficiency of the winding clamping force, and thus improves the safety of the transformer itself.

[0017] The beneficial effects of the automatic early warning system for winding clamping force of oil-immersed transformer provided by the present invention are as follows: Compared with the prior art, the present invention can detect and judge the winding clamping force after adjustment by using a timer and a second force-sensitive sensor. If the winding clamping force after adjustment is still abnormal, it means that the winding clamping force has dropped to a state that cannot be automatically adjusted and restored. At this time, the second controller controls the alarm to sound an alarm so that the staff can carry out maintenance in time, thereby improving the safety detection efficiency after the winding clamping force is adjusted. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 Side cross-sectional view of the automatic adjustment device for winding clamping force of oil-immersed transformer provided in the first embodiment of the present invention. Figure 1 ;

[0020] Figure 2 Side cross-sectional view of the automatic adjustment device for winding clamping force of oil-immersed transformer provided in the first embodiment of the present invention. Figure 2 ;

[0021] Figure 3 A partial cross-sectional view of the firing pin mechanism provided in the first embodiment of the present invention;

[0022] Figure 4 A partial cross-sectional view of the limiting mechanism provided in the first embodiment of the present invention;

[0023] Figure 5 A partial cross-sectional view of the buffer assembly provided in the first embodiment of the present invention;

[0024] Figure 6 A partial cross-sectional view of the positioning component provided in the first embodiment of the present invention;

[0025] Figure 7 This is a system block diagram of the automatic sensing system provided in the first embodiment of the present invention;

[0026] Figure 8 This is a system block diagram of an automatic early warning system for the winding clamping force of an oil-immersed transformer provided in the second embodiment of the present invention.

[0027] The labels for the attached figures are as follows:

[0028] 1. Clamping plate; 2. Pressure plate; 3. Housing; 31. Bottom hole; 311. Buffer groove; 32. Micro-hole; 33. Insulating diaphragm; 4. Disc spring string; 41. Piston column; 411. Slot; 5. Restriction mechanism; 51. Telescopic hook; 511. Outer tube; 5111. First cavity; 5112. Second cavity; 512. Inner hook; 52. Drive assembly; 521. Second protective shell; 522. Drive motor; 523. Drive shaft; 524. Gear; 525. Rack; 6. Strike pin mechanism; 61. First protective shell; 62. Moving plate; 63. Moving pin; 64. Push assembly; 641. Push motor; 642. Cam; 7. Buffer assembly; 71. Buffer spring; 72. Buffer block; 73. Buffer magnet; 8. Positioning assembly; 81. Third protective shell; 82. Drive cylinder; 83. Pawl; 84. Ratchet. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain the invention and are not intended to limit the invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] It should be further noted that the accompanying drawings and embodiments of the present invention mainly describe the concept of the present invention. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of the present invention, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0031] When a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0032] The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself. The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0033] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0035] The automatic adjustment device and early warning system for the winding clamping force of the oil-immersed transformer provided by the present invention will now be described.

[0036] like Figure 1 and Figure 2As shown, the first embodiment of the present invention provides an automatic adjustment device for the winding clamping force of an oil-immersed transformer, including multiple housings 3 arranged in a ring between a clamping plate 1 and a pressure plate 2. The top of the housing 3 is fixed to the clamping plate 1. The pressure plate 2 is ring-shaped and disposed on the winding. A bottom hole 31 is provided at the bottom of the housing. A string of disc springs 4 is disposed inside the housing 3. A piston column 41 is disposed inside the string of disc springs 4. The bottom end of the piston column 41 passes through the bottom hole 31 and is pressed against the pressure plate 2. The top of the string of disc springs 4 is fixed to the housing 3, and the bottom end of the string of disc springs 4 is fixed to the piston column 41. A limiting mechanism 5 is provided on the housing 3 to restrict the string of disc springs 4 to a compressed state. An automatic sensing system connected to the limiting mechanism 5 is provided below the pressure plate 2. The automatic sensing system is used to monitor the winding clamping force and control the limiting mechanism 5 to release the compression restriction on the string of disc springs 4.

[0037] Compared with the prior art, the automatic adjustment device for winding clamping force of oil-immersed transformer provided in this embodiment monitors the winding clamping force in real time through an automatic sensing system. When an abnormal winding clamping force is detected, it controls all limiting mechanisms 5 to release the compression restriction on the disc spring strings 4. At this time, all disc spring strings 4 extend and reset, and the disc spring strings 4 drive the corresponding piston column 41 to press down the pressure plate 2, thereby realizing the automatic adjustment of winding clamping force. There is no need for cover removal, which improves the monitoring efficiency and adjustment efficiency of winding clamping force, and thus improves the safety of the transformer itself.

[0038] like Figure 2 and Figure 3 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0039] The housing 3 has several micro-holes 32 on its side, and each micro-hole 32 is provided with an insulating diaphragm 33. The piston column 41 is sealed with the bottom hole 31. The housing 3 is filled with transformer oil, and the pressure inside the housing 3 is greater than the pressure outside the housing 3. A striking pin mechanism 6 is provided below the clamping plate 1 on one side of the housing 3. The striking pin mechanism 6 is used to puncture all the insulating diaphragms 33. An automatic sensing system is connected to the striking pin mechanism 6. The automatic sensing system is used to control the striking pin mechanism 6 to reset after puncturing the insulating diaphragms 33.

[0040] Specifically, in this embodiment, the transformer oil inside the housing 3 has the same composition as the transformer oil outside the housing 3.

[0041] When the automatic sensing system detects an abnormal winding clamping force, the control pin mechanism 6 punctures all the insulating diaphragms 33, and the transformer oil inside the housing 3 flows out through the micropores 32, which helps to slowly release the stress of the disc spring string 4.

[0042] like Figures 2 to 3 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0043] The striking pin mechanism 6 includes a first protective shell 61, a movable plate 62, a movable pin 63, and a pushing component 64. The first protective shell 61 is fixed below the clamping limb plate 1. The movable plate 62 is slidably disposed inside the first protective shell 61. There are multiple movable pins 63, which are fixed on the movable plate 62. The outer end of the movable pin 63 protrudes from the first protective shell 61 and is positioned directly opposite the corresponding micro-hole 32. The pushing component 64 is disposed inside the first protective shell 61 and is used to drive the movable plate 62 to move toward the shell 3.

[0044] Furthermore, the pushing component 64 includes a pushing motor 641 and a cam 642. The pushing motor 641 is disposed inside the first protective housing 61, and the cam 642 is fixed on the output shaft of the pushing motor 641. One side of the cam 642 abuts against the side wall of the moving plate 62. When the outermost end of the cam 642 rotates to disengage from the moving plate 62, the moving needle 63 has already punctured the corresponding insulating diaphragm 33, thereby improving the overall efficiency of puncturing all insulating diaphragms 33 at the same time.

[0045] like Figure 1 and Figure 4 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0046] The limiting mechanism 5 includes telescopic hooks 51 and drive components 52. There are two sets of telescopic hooks 51, which are located on both sides of the disc spring string 4. There are two sets of drive components 52, which correspond one-to-one with the telescopic hooks 51. The top of the telescopic hook 51 is fixed to the top wall inside the housing 3, and the bottom of the telescopic hook 51 is hooked to the bottom of the disc spring string 4. The drive components 52 are used to adjust the telescopic length of the telescopic hooks 51.

[0047] When the automatic sensing system detects an abnormal winding clamping force, the control drive component 52 adjusts the length of the telescopic hook 51, causing the telescopic hook 51 to extend. At this time, the bottom end of the telescopic hook 51 descends, and the disc spring string 4 slowly extends and resets, improving the efficiency of releasing the restriction on the disc spring string 4.

[0048] like Figure 1 and Figure 4 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0049] The telescopic hook 51 includes an outer tube 511 and an inner hook 512. The outer tube 511 is fixed to the top wall inside the housing 3. One end of the inner hook 512 is slidably disposed inside the outer tube 511, and the other end of the inner hook 512 is hooked to the bottom end of the disc spring string 4. The drive assembly 52 is used to drive the inner hook 512 to slide inside the outer tube 511. A buffer assembly 7 is provided on the housing 3. The buffer assembly 7 is used to slow down the stretching speed of the disc spring string 4 when the inner hook 512 descends to extend and reset the disc spring string 4. A positioning assembly 8 is provided on the telescopic hook 51 to fix the inner hook 512 in any position.

[0050] When the automatic sensing system detects an abnormal winding clamping force, the control drive component 52 moves the inner hook 512 downward, thereby achieving automatic reset of the disc spring string 4. At the same time, the buffer component 7 can slow down the speed of the disc spring string 4 during reset, minimizing the workload on the drive component 52 caused by the disc spring string 4 continuously pressing down against the inner hook 512. The positioning component 8 can minimize the downward pressure of the disc spring string 4 on the inner hook 512 in any state, whether the disc spring string 4 is in the initial compressed state or after adjustment, further reducing the workload on the drive component 52.

[0051] like Figure 1 and Figure 4 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0052] The drive assembly 52 includes a second protective shell 521, a drive motor 522, a drive shaft 523, a gear 524, and a rack 525. The second protective shell 521 is fixed to one side of the housing 3. The drive motor 522 is disposed inside the second protective shell 521. The drive shaft 523 is coaxially fixed to the output shaft of the drive motor 522 and extends into the housing 3. A first cavity 5111 is provided inside the outer tube 511. The gear 524 is rotatably connected to the first cavity 5111 and coaxially fixed to the drive shaft 523. The rack 525 is fixed to one side of the inner hook 512 and meshes with the gear 524.

[0053] When the automatic sensing system detects an abnormal winding clamping force, it controls the drive motor 522 to start and drive the drive shaft 523 to rotate. The drive shaft 523 drives the gear 524 to rotate, and the gear 524 drives the inner hook 512 to move downward through the rack 525, thereby improving the length adjustment efficiency of the telescopic hook 51.

[0054] like Figure 5 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0055] The buffer assembly 7 includes a buffer spring 71, a buffer block 72, and a buffer magnet 73; a buffer groove 311 is provided on the side wall of the bottom hole 31, the buffer spring 71 is disposed in the buffer groove 311, and the buffer block 72 slides at the opening of the buffer groove 311 and is connected to the buffer spring 71; multiple slots 411 are provided at equal intervals along the length of the side wall of the piston column 41, and when the buffer spring 71 is in its natural state, the buffer block 72 is simultaneously located in the buffer groove 311 and the slots 411; the upper surface of the buffer block 72 located in the slot 411 is inclined, and the buffer magnet 73 is fixedly attached to the inclined surface of the buffer block 72; the piston column 41 is made of metal and is held in place by the buffer magnet 73.

[0056] Before the disc spring string 4 drives the piston column 41 to descend, the buffer spring 71 is in a compressed state, and the buffer block 72 and the buffer magnet 73 are completely located in the buffer groove 311. When the disc spring string 4 drives the slot 411 on the piston column 41 to descend to connect with the buffer groove 311, the elastic force of the buffer spring 71 drives the buffer block 72 to insert into the slot 411, and at the same time, the buffer magnet 73 is attracted to the piston column 41. At this time, the reset speed of the disc spring string 4 and the descent speed of the piston column 41 are significantly reduced. The setting of the buffer magnet 73 further improves the effect on the descent speed of the piston column 41. The reset elastic force of the disc spring string 4 continues to drive the piston column 41 to descend, so that the buffer block 72 gradually enters the buffer groove 311 again. When the next slot 411 is reached, this action is repeated, so that the reset speed of the disc spring string 4 and the descent speed of the buffer column are set in a waveform, thereby avoiding the pressure on the inner hook 512 during the reset process of the disc spring string 4, and thus reducing the workload of the gear 524 and the rack 525.

[0057] like Figure 4 and Figure 6 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0058] The positioning assembly 8 includes a third protective shell 81, a drive cylinder 82, a pawl 83, and a ratchet 84. The third protective shell 81 is fixed to one side of the housing 3. The drive cylinder 82 is disposed inside the third protective shell 81, with one end of the drive cylinder 82 penetrating into the housing 3 and connected to the rotating shaft of the pawl 83. A second cavity 5112 is provided inside the outer tube 511. The pawl 83 is rotatably connected to the second cavity 5112, and the rotating shaft of the pawl 83 is slidably disposed in the second cavity 5112 along its own length direction. The ratchet 84 is fixed on the inner hook 512 and engages with the pawl 83. The drive cylinder 82 is used to drive the pawl 83 to engage or disengage with the ratchet 84. When the pawl 83 engages with the ratchet 84, the ratchet 84 cannot move downward.

[0059] Specifically, in this embodiment, the drive cylinder 82 is an electric cylinder.

[0060] When the disc spring string 4 is in the initial compressed state, the pawl 83 and the ratchet 84 are engaged. At this time, the force of the disc spring string 4 is applied to the pawl 83 and the ratchet 84 through the inner hook 512, which greatly reduces the continuous burden on the drive assembly 52. ​​When it is necessary to adjust the winding clamping force, the drive cylinder 82 drives the rotating shaft of the pawl 83 to move, so that the pawl 83 and the ratchet 84 are separated. Then, the rotation of the gear 524 drives the rack 525 and the inner hook 512 to descend.

[0061] like Figure 7 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0062] The automatic sensing system includes a first force sensor and a first controller. The first force sensor is located below the pressure plate 2 and is used to monitor the winding clamping force. The signal output terminal of the first force sensor is connected to the signal input terminal of the first controller. When the clamping force value detected by the first force sensor is less than a preset value, an abnormal signal is output. The signal output terminal of the first controller is connected to the drive motor 522, the push motor 641, and the drive cylinder 82. When the first controller receives the abnormal signal, the first controller controls the drive cylinder 82 to drive the pawl 83 to separate from the ratchet 84. At the same time, it controls the drive motor 522 to start and drive the drive shaft 523 and gear 524 to rotate, thereby lowering the inner hook 512. It also controls the push motor 641 to drive the cam 642 to rotate, so that the moving plate 62 drives the moving needle 63 to puncture the insulating diaphragm 33.

[0063] It enables real-time monitoring of winding clamping force and automatically adjusts the winding clamping force after detecting an abnormality, ensuring stable, safe and reliable overall operation.

[0064] like Figure 8 As shown, based on the same inventive concept, the second embodiment of the present invention provides an automatic early warning system for the winding clamping force of an oil-immersed transformer, including a timer, a second force-sensitive sensor, a second controller, and an alarm. The signal input terminal of the timer is connected to the signal output terminal of the first controller. When the first controller receives an abnormal signal, it outputs a timing signal to the timer. When the timer receives the timing signal, it starts timing. When the timing time reaches a preset time value, the timer outputs an arrival signal. The second force-sensitive sensor is connected to the output terminal of the timer and receives the arrival signal. When the second force-sensitive sensor receives the arrival signal, it detects the winding clamping force. When the clamping force value detected by the second force-sensitive sensor is less than a preset value, it outputs a danger signal. The second controller is connected to the second force-sensitive sensor and receives the danger signal. When the second controller receives the danger signal, it outputs an alarm signal. The signal input terminal of the alarm is connected to the second controller and alarms when it receives the alarm signal.

[0065] The automatic early warning system for winding clamping force of oil-immersed transformers provided in this embodiment, compared with the prior art, can detect and judge the winding clamping force after adjustment by using a timer and a second force-sensitive sensor. If the winding clamping force is still abnormal after adjustment, it means that the winding clamping force has dropped to a state that cannot be automatically adjusted and restored. At this time, the second controller controls the alarm to sound an alarm so that the staff can carry out maintenance in time, thereby improving the safety detection efficiency after the winding clamping force is adjusted.

[0066] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0067] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0068] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

Claims

1. An automatic adjustment device for the winding clamping force of an oil-immersed transformer, characterized in that, The device includes multiple housings (3) arranged in a ring between a clamping limb plate (1) and a pressure plate (2). The top of each housing (3) is fixed to the clamping limb plate (1), and the bottom of each housing (3) has a bottom hole (31). A string of disc springs (4) is provided inside each housing (3), and a piston column (41) is provided inside the string of disc springs (4). The bottom end of the piston column (41) passes through the bottom hole (31) and presses against the pressure plate (2). The top of the string of disc springs (4) is fixed to the housing (3), and the bottom end of the string of disc springs (4) is fixed to the piston column (41). A limiting mechanism (5) is provided on the housing (3) to restrict the string of disc springs (4) to a compressed state. An automatic sensing system connected to the limiting mechanism (5) is provided below the pressure plate (2). The automatic sensing system is used to monitor the winding clamping force and control the limiting mechanism (5) to release the compression restriction on the string of disc springs (4).

2. The automatic adjustment device for winding clamping force of an oil-immersed transformer as described in claim 1, characterized in that, The housing (3) has several micro-holes (32) on its side, and each micro-hole (32) is provided with an insulating diaphragm (33). The piston column (41) is sealed to the bottom hole (31). The housing (3) is filled with transformer oil, and the pressure inside the housing (3) is greater than the pressure outside the housing (3). A striking pin mechanism (6) is provided below the clamping plate (1) on one side of the housing (3). The striking pin mechanism (6) is used to puncture all the insulating diaphragms (33). The automatic sensing system is connected to the striking pin mechanism (6). The automatic sensing system is used to control the striking pin mechanism (6) to reset after puncturing the insulating diaphragms (33).

3. The automatic adjustment device for winding clamping force of an oil-immersed transformer as described in claim 2, characterized in that, The striking pin mechanism (6) includes a first protective shell (61), a movable plate (62), a movable pin (63), and a pushing component (64). The first protective shell (61) is fixed below the clamping limb plate (1). The movable plate (62) is slidably disposed inside the first protective shell (61). There are multiple movable pins (63) and they are fixed on the movable plate (62). The outer end of the movable pin (63) protrudes from the first protective shell (61) and is positioned opposite to the corresponding micro-hole (32). The pushing component (64) is disposed inside the first protective shell (61) and is used to drive the movable plate (62) to move toward the housing (3).

4. The automatic adjustment device for winding clamping force of an oil-immersed transformer as described in claim 1, characterized in that, The limiting mechanism (5) includes a telescopic hook (51) and a drive assembly (52). There are two sets of telescopic hooks (51) located on both sides of the disc spring string (4). There are two sets of drive assemblies (52) that correspond one-to-one with the telescopic hooks (51). The top end of the telescopic hook (51) is fixed to the inner top wall of the housing (3), and the bottom end of the telescopic hook (51) is hooked to the bottom end of the disc spring string (4). The drive assembly (52) is used to adjust the telescopic length of the telescopic hook (51).

5. The automatic adjustment device for winding clamping force of an oil-immersed transformer as described in claim 4, characterized in that, The telescopic hook (51) includes an outer tube (511) and an inner hook (512). The outer tube (511) is fixed on the inner top wall of the housing (3). One end of the inner hook (512) is slidably disposed inside the outer tube (511), and the other end of the inner hook (512) is hooked to the bottom end of the disc spring string (4). The driving component (52) is used to drive the inner hook (512) to slide inside the outer tube (511). A buffer component (7) is provided on the housing (3). The buffer component (7) is used to slow down the stretching speed of the disc spring string (4) when the inner hook (512) descends to extend and reset the disc spring string (4). A positioning component (8) is provided on the telescopic hook (51) to fix the inner hook (512) in any position.

6. The automatic adjustment device for winding clamping force of an oil-immersed transformer as described in claim 5, characterized in that, The drive assembly (52) includes a second protective shell (521), a drive motor (522), a drive shaft (523), a gear (524), and a rack (525); the second protective shell (521) is fixed to one side of the housing (3), the drive motor (522) is disposed inside the second protective shell (521), the drive shaft (523) is coaxially fixed on the output shaft of the drive motor (522) and extends into the housing (3); a first cavity (5111) is provided inside the outer tube (511), the gear (524) is rotatably connected in the first cavity (5111) and coaxially fixed with the drive shaft (523), and the rack (525) is fixed to one side of the inner hook (512) and meshes with the gear (524).

7. The automatic adjustment device for winding clamping force of an oil-immersed transformer as described in claim 6, characterized in that, The buffer assembly (7) includes a buffer spring (71), a buffer block (72), and a buffer magnet (73); a buffer groove (311) is provided on the side wall of the bottom hole (31), the buffer spring (71) is disposed in the buffer groove (311), and the buffer block (72) slides at the opening of the buffer groove (311) and is connected to the buffer spring (71); a plurality of slots (411) are provided at equal intervals along the length direction of the side wall of the piston column (41), and when the buffer spring (71) is in its natural state, the buffer block (72) is located in both the buffer groove (311) and the slots (411); the upper surface of the buffer block (72) located in the slot (411) is inclined, and the buffer magnet (73) is fixedly attached to the inclined surface of the buffer block (72); the piston column (41) is made of metal and is attracted by the buffer magnet (73).

8. The automatic adjustment device for winding clamping force of an oil-immersed transformer as described in claim 6, characterized in that, The positioning assembly (8) includes a third protective shell (81), a drive cylinder (82), a pawl (83), and a ratchet (84); the third protective shell (81) is fixed to one side of the housing (3), the drive cylinder (82) is disposed inside the third protective shell (81), one end of the drive cylinder (82) extends into the housing (3) and is connected to the rotating shaft of the pawl (83); a second cavity (5112) is provided inside the outer tube (511), and the pawl (83) The pawl (83) is rotatably connected in the second cavity (5112), and the pawl (83) is slidably disposed in the second cavity (5112) along its own length direction. The ratchet (84) is fixed on the inner hook (512) and meshes with the pawl (83). The drive cylinder (82) is used to drive the pawl (83) to mesh or disengage with the ratchet (84). When the pawl (83) meshes with the ratchet (84), the ratchet (84) cannot move downward.

9. The automatic adjustment device for winding clamping force of an oil-immersed transformer as described in claim 2, characterized in that, The automatic sensing system includes a first force sensor and a first controller. The first force sensor is located below the pressure plate (2) and is used to monitor the winding clamping force. The signal output terminal of the first force sensor is connected to the signal input terminal of the first controller. When the clamping force value detected by the first force sensor is less than a preset value, an abnormal signal is output. The signal output terminal of the first controller is connected to the limiting mechanism (5) and the striking pin mechanism (6). When the first controller receives the abnormal signal, the first controller controls the limiting mechanism (5) to release the compression restriction on the disc spring string (4) and controls the striking pin mechanism (6) to puncture the insulating diaphragm (33) and reset it.

10. An automatic early warning system for winding clamping force of an oil-immersed transformer, characterized in that, The automatic adjustment device for winding clamping force of an oil-immersed transformer as described in claim 9 includes a timer, a second force-sensitive sensor, a second controller, and an alarm. The signal input terminal of the timer is connected to the signal output terminal of the first controller. When the first controller receives the abnormal signal, it outputs a timing signal to the timer. When the timer receives the timing signal, it starts timing. When the timing time reaches a preset time value, the timer outputs an arrival signal. The second force-sensitive sensor is connected to the output terminal of the timer and receives the arrival signal. When the second force-sensitive sensor receives the arrival signal, it detects the winding clamping force. When the clamping force value detected by the second force-sensitive sensor is less than a preset value, it outputs a danger signal. The second controller is connected to the second force-sensitive sensor and receives the danger signal. When the second controller receives the danger signal, it outputs an alarm signal. The alarm is connected to the second controller and sounds an alarm when it receives the alarm signal.

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