High-safety transformer

Abstract

The invention relates to the technical field of transformers, and particularly discloses a high-safety transformer which comprises an oil tank and an oil conservator, a cover plate is fixedly mounted at the top end of the oil tank, a fixing frame is fixedly mounted on one side of the oil tank, the oil conservator is fixedly mounted at the top end of the fixing frame, a first oil pipe is fixedly connected to the bottom of the oil conservator, and a gas relay is fixedly connected to the middle of the first oil pipe. A second oil pipe is fixedly connected to the portion, between the conservator and the gas relay, of the first oil pipe, a mounting frame is fixedly connected to one side of the cover plate, a first cylinder is fixedly mounted at the top of the mounting frame, a one-way assembly is arranged in an inner cavity of the first cylinder, and the center of one side of the first cylinder communicates with the second oil pipe. The other side of the first cylinder is of an opening structure and is fixedly connected to a second cylinder mounted at the top of the mounting frame, and a pressure relief assembly is arranged in the second cylinder. And when the transformer continuously operates in an overpressure manner but does not reach a light gas protection alarm condition, the safe operation of the transformer is protected, and dangers are prevented.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, and in particular to a high-safety transformer. Background Art

[0002] Gas protection is the main protection for transformer faults. Gas protection is divided into light gas protection and heavy gas protection. Light gas protection acts on alarm and heavy gas protection acts on tripping. However, in some cases, in order to prevent the fault from worsening, measures should be taken immediately after the light gas protection occurs, including instantaneous disconnection of the transformer to ensure the safety of the power grid and equipment.

[0003] In this context, it is not easy for operation and maintenance personnel to observe the expansion state of the transformer insulating oil before the gas protection is activated when the transformer works at high load for a long time, nor is it easy to promptly discover the pressure increase in the oil tank and oil pillow caused by the overpressure operation of the transformer. The insulating oil in the overpressure expansion state for a long time will pose a threat to the transformer casing. Once the transformer casing is deformed or even ruptured under the hydraulic action of the insulating oil, it is very easy to induce a fire or even a transformer explosion. In addition, when the commonly used transformers are undergoing gas protection maintenance, the transformer lacks main protection, which is not conducive to protecting the safety of the equipment. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a high-safety transformer.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-safety transformer comprises an oil tank and an oil pillow, wherein a cover plate is fixedly installed on the top of the oil tank, a pressure plate is fixedly installed on the inner wall of the oil tank, a connecting pipe is connected to the top of the pressure plate, the top of the connecting pipe is connected to the cover plate, a cooling assembly is arranged on the top of the connecting pipe, a fixing frame is fixedly installed on one side of the oil tank, an oil pillow is fixedly installed on the top of the fixing frame, a first oil pipe is fixedly connected to the bottom of the oil pillow, the end of the first oil pipe is inserted into the oil tank, a gas relay is fixedly connected to the middle of the first oil pipe, a second oil pipe is fixedly connected to the first oil pipe between the oil pillow and the gas relay, a mounting frame is fixedly connected to one side of the cover plate, a first cylinder is fixedly installed on the top of the mounting frame, a single-pass assembly is arranged in the internal cavity of the first cylinder, the center of one side of the first cylinder is connected to the second oil pipe, the other side of the first cylinder is an opening structure and is fixedly connected to the second cylinder installed on the top of the mounting frame, an oil level gauge is fixedly installed on one side of the bottom of the second cylinder, and a pressure relief assembly is arranged inside the second cylinder;

[0007] The single-pass assembly includes a tapered slider and a first spring. A sleeve whose end is fixedly connected to the side wall of the second cylinder is arranged at the center of the first cylinder. The tapered slider is slidably connected to one side of the sleeve. The first spring is fixedly connected between one side of the tapered slider and the side wall of the second cylinder.

[0008] The pressure relief assembly includes an L-shaped through groove and an annular slider. A connecting rod is fixedly connected to the center of the second cylinder. The connecting rod is slidably connected to the annular slider on one side close to the first cylinder. A matching groove matching the annular slider is provided on one side of the internal cavity of the second cylinder. A plurality of L-shaped through grooves are provided in the matching groove, and the ends of the L-shaped through grooves are connected to the first cylinder.

[0009] Preferably, a plurality of radiators are installed on the side walls of the oil tank, a coil is installed inside the oil tank, six wiring terminals are fixedly installed on the top of the cover plate, and a dryer is fixedly connected to the top of the oil pillow through a pipeline.

[0010] Preferably, first manual valves are installed on the first oil pipes on both sides of the gas relay, and a second manual valve is installed on the second oil pipe on one side of the gas relay.

[0011] Preferably, an air valve is fixedly mounted on the top of the first cylinder, the air valve is connected to the internal cavity of the first cylinder, and the internal cavity of the first cylinder is connected to the oil tank through a pipeline.

[0012] Preferably, a filter is sleeved on the outer side of the sleeve, the outer side of the filter is slidably connected to the inner wall of the inner cavity of the first cylinder, and a filter screen and an adsorption bin are arranged inside the filter.

[0013] Preferably, a second spring sleeved on the connecting rod is fixedly connected between one side of the annular slider and the inner wall of the second cylinder, and the action pressure of the second spring is smaller than the action pressure of the gas relay.

[0014] Preferably, an inclined oil groove is provided at the bottom of the inner cavity of the second cylinder, one end of the inclined oil groove is connected to the matching groove, and the other end of the inclined oil groove is connected to the oil level gauge.

[0015] Preferably, the side wall of the annular slider is symmetrically connected to two sliding rods, and the side wall of the inner cavity of the second cylinder is symmetrically connected to two fixed sleeves. One side of the two sliding rods is respectively slidably connected to the two fixed sleeves, and an air cavity is formed between the interior of the fixed sleeves and the sliding rods.

[0016] Preferably, two air pipes are fixedly connected on both sides of the second cylinder, the top ends of the two air pipes are respectively inserted into the two air cavities, the bottom ends of the two air pipes are connected to a switch located between the second cylinder and the cooling assembly, an external connecting pipe is fixedly connected to the bottom of the switch, and a joint is provided at the bottom end of the external connecting pipe.

[0017] Preferably, the cooling assembly includes a cooling cavity, an airbag is installed on the top of the connecting pipe, a cooler is fixedly installed on the top of the cover plate, a cooling cavity is opened in the cooler, the airbag is wrapped in the cooling cavity, the normal diameter of the airbag is smaller than the diameter of the cooling cavity, and the top of the connecting pipe is connected to the switch.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a first oil pipe and a second oil pipe, and the second oil pipe serves as a branch of the first oil pipe, so that the insulating oil circulation between the oil pillow and the oil tank can be divided into two paths, one path passes through the gas relay, and the other path flows into the oil tank through the first cylinder. When regular maintenance of the gas relay is required, the two first manual valves can be manually closed to isolate the gas relay from the oil tank, so as to perform non-stop maintenance without affecting the normal power supply of the transformer. At this time, the pressure relief component can be used as temporary protection to ensure the safety of the transformer, and the maintenance personnel can judge the working status of the transformer by observing the oil level height of the oil level gauge.

[0020] The present invention sets a single-pass component, and the insulating oil flowing into the first cylinder first pushes the conical slider to slide along the sleeve and compresses the first spring. At this time, the insulating oil flows into the first cylinder and flows into the oil tank through the filter. The filter can effectively reduce the impurity content in the insulating oil, improve the use effect and service life of the insulating oil, protect the transformer, and reduce the influence of impurities on the transformer coil and magnetic field. When the pressure in the oil tank increases and the insulating oil flows back into the oil pillow, the first spring loses its force and resets to push the conical slider to seal the connection between the first cylinder and the second oil pipe. At this time, the reflux insulating oil can only flow back through the first oil pipe through the gas relay, ensuring that the gas relay can still serve as the main protection of the transformer under normal working conditions of the transformer, and the first cylinder will not affect the normal working of the gas relay, thereby preventing the danger of the gas relay not triggering the alarm due to the diversion of the second oil pipe when an overpressure alarm occurs.

[0021] The present invention provides a pressure relief component. When the transformer continues to operate at overpressure but does not reach the light gas protection alarm condition, the pressure relief component is activated to flow the insulating oil in the first cylinder into the second cylinder through the L-shaped groove. At this time, the pressure in the first cylinder and the oil tank is released, which can effectively alleviate the overpressure condition of the oil tank, protect the metal material of the oil tank in advance, prevent the oil tank from irreversible deformation, and protect various components of the transformer before the gas relay protection action, which can also have a positive effect on the safety of the power grid and equipment. The insulating oil flowing into the second cylinder will eventually flow into the oil level gauge, which is convenient for operation and maintenance personnel to observe in time during inspection, and can judge the load overpressure condition of the transformer, and make adjustments in time, and then judge the working status of various components in the transformer, providing an analysis basis for later maintenance, which is conducive to reducing the risk of the gas relay alarming or tripping due to faults such as transformer overpressure, and also plays a protective and preventive function for the power grid and electrical equipment.

[0022] The present invention provides a cooling component. Under the action of oil pressure, the gas in the pressure plate will be squeezed into the airbag, and the airbag will expand and abut against the cooling cavity. The temperature carried by the gas can be reduced by the cooling effect of the cooler, and the airbag will shrink. Such a cycle forms a breathing-like action, which can effectively bring out the heat of the insulating oil in the oil tank, ensure the normal operation of the insulating oil, reduce the possibility of damage to the transformer material, and extend the working life. When the transformer continues to work at overpressure, the airbag continues to expand and abut against the cooling cavity, and the air pressure can act on the air cavity to drive the annular slider to move for pressure relief. The setting of the cooling component does not affect the normal operation of the pressure relief component.

[0023] The present invention provides a switch and an external connecting pipe, and the two air pipes can be connected to the external connecting pipe by manually switching the valve of the switch. At this time, the operation and maintenance personnel can actively fill the compressed gas into the air cavity by connecting an external air pump to force the pressure relief component to work, perform pressure relief protection, and prevent safety failure problems of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a high-safety transformer proposed by the present invention;

[0025] Figure 2 A top view of a high-safety transformer proposed by the present invention;

[0026] Figure 3 This is a schematic diagram of the cover plate and fixing frame structure of a high-safety transformer proposed by the present invention;

[0027] Figure 4 A high-safety transformer proposed by the present invention Figure 3 The enlarged view of the structure at A shown in FIG.

[0028] Figure 5 A schematic diagram of the structure of a gas relay for a transformer with high safety proposed by the present invention;

[0029] Figure 6 A first cylindrical cross-sectional view of a high-safety transformer proposed by the present invention;

[0030] Figure 7 This is an exploded diagram of the first cylinder structure of a high-safety transformer proposed by the present invention;

[0031] Figure 8 A cross-sectional view of a pressure relief assembly of a transformer with high safety proposed by the present invention;

[0032] Fig. 9 A schematic diagram of the operating state of a ring slider of a high-safety transformer proposed by the present invention;

[0033] Fig.10 This is a schematic diagram of the second cylinder structure of a high-safety transformer proposed by the present invention;

[0034] Fig.11 A schematic diagram of the structure of a pressure relief component and a cooling component of a transformer with high safety proposed by the present invention;

[0035] Fig.12 This is a schematic diagram of a fixed sleeve and a sliding rod structure of a high-safety transformer proposed by the present invention;

[0036] Fig.13 This is a schematic diagram of the structure of a connecting pipe and an external connecting pipe of a high-safety transformer proposed by the present invention;

[0037] Fig.14 This is a schematic diagram of the cooling chamber structure of a high-safety transformer proposed by the present invention.

[0038] In the figure: 1, oil tank; 2, radiator; 3, cover plate; 4, terminal block; 5, fixing frame; 6, oil pillow; 7, dryer; 8, first oil pipe; 81, first manual valve; 9, second oil pipe; 91, second manual valve; 10, gas relay; 11, mounting frame; 12, first cylinder; 121, gas valve; 13, single-pass assembly; 14, filter; 15, tapered slider; 16, sleeve; 17, first spring ; 18. Second cylinder; 19. Pressure relief assembly; 20. L-shaped groove; 21. Connecting rod; 22. Second spring; 23. Annular slider; 24. Inclined oil groove; 25. Oil level gauge; 26. Fixed sleeve; 27. Sliding rod; 28. Air cavity; 29. ​​Air pipe; 30. Switcher; 31. Cooling assembly; 32. Cooling cavity; 33. Connecting pipe; 331. Air bag; 34. Pressure plate; 35. External connecting pipe. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] Reference Figure 1-14 A high-safety transformer comprises an oil tank 1 and an oil pillow 6. A cover plate 3 is fixedly installed on the top of the oil tank 1. A pressure plate 34 is fixedly installed on the inner wall of the oil tank 1. A connecting pipe 33 is connected to the top of the pressure plate 34. The top of the connecting pipe 33 passes through the cover plate 3. A cooling assembly 31 is arranged on the top of the connecting pipe 33. A fixing frame 5 is fixedly installed on one side of the oil tank 1. An oil pillow 6 is fixedly installed on the top of the fixing frame 5. A first oil pipe 8 is fixedly connected to the bottom of the oil pillow 6. The end of the first oil pipe 8 passes into the oil tank 1. A gas relay 10 is fixedly connected to the middle of the first oil pipe 8. A second oil pipe 9 is fixedly connected to the first oil pipe 8 between the pillow 6 and the gas relay 10, a mounting frame 11 is fixedly connected to one side of the cover plate 3, a first cylinder 12 is fixedly installed on the top of the mounting frame 11, a single-pass component 13 is provided in the inner cavity of the first cylinder 12, the center of one side of the first cylinder 12 is connected to the second oil pipe 9, the other side of the first cylinder 12 is an open structure and is fixedly connected to a second cylinder 18 installed on the top of the mounting frame 11, an oil level gauge 25 is fixedly installed on one side of the bottom of the second cylinder 18, and a pressure relief component 19 is provided inside the second cylinder 18;

[0041] The single-pass component 13 includes a tapered slider 15 and a first spring 17. A sleeve 16 whose end is fixedly connected to the side wall of the second cylinder 18 is provided at the center of the first cylinder 12. The tapered slider 15 is slidably connected to one side of the sleeve 16. The first spring 17 is fixedly connected between one side of the tapered slider 15 and the side wall of the second cylinder 18.

[0042] The pressure relief assembly 19 includes an L-shaped through groove 20 and an annular slider 23. A connecting rod 21 is fixedly connected to the center of the second cylinder 18. The connecting rod 21 is slidably connected to the annular slider 23 on the side close to the first cylinder 12. A matching groove matching the annular slider 23 is provided on one side of the internal cavity of the second cylinder 18. A plurality of L-shaped through grooves 20 are provided in the matching groove, and the ends of the L-shaped through grooves 20 are connected to the first cylinder 12. The oil-immersed transformer insulates and cools the coil and other components by filling the oil tank 1 with insulating oil. As the transformer load changes, the temperature and pressure of the insulating oil also change accordingly, and the insulating oil stored in the oil pillow 6 is circulated and exchanged through the first oil pipe 8. In order to enhance the circulation effect, there is also a forced circulation method using an external oil pump, in which the gas relay 10 serves as the main protection of the transformer and is used for early warning or tripping when the transformer fails. The second oil pipe 9 serves as a branch of the first oil pipe 8, and the insulating oil circulation between the oil pillow 6 and the oil tank 1 can be divided into two paths, one passing through the gas relay 10, and the other flowing into the oil tank through the first cylinder 12 1, the insulating oil flowing into the first cylinder 12 first impacts the conical end of the conical slider 15, pushing the conical slider 15 to slide along the sleeve 16 and compressing the first spring 17. At this time, the insulating oil flows into the first cylinder 12 and flows into the oil tank 1 through the filter 14. The pressure in the oil tank 1 increases. When the insulating oil flows back into the oil pillow 6, the first spring 17 loses its force and resets, pushing the conical slider 15 to seal the connection between the first cylinder 12 and the second oil pipe 9. At this time, the reflux insulating oil can only flow back through the first oil pipe 8 and the gas relay 10, ensuring that under the normal working state of the transformer, the gas relay 10 can still serve as the main protection of the transformer, and the first cylinder 12 does not It will affect the normal operation of the gas relay 10, and prevent the gas relay 10 from not triggering the alarm due to the diversion of the second oil pipe 9 when an overpressure alarm condition occurs. When the transformer continues to operate at overpressure but does not reach the light gas protection alarm condition, the insulating oil pressure in the oil tank 1 increases, and by squeezing the pressure plate 34, the gas in the pressure plate 34 flows into the air cavity 28 through the connecting pipe 33 and the air pipe 29, and pushes the sliding rod 27 to pull the annular slider 23, the annular slider 23 disengages from the matching groove, and the insulating oil in the first cylinder 12 flows into the second cylinder 18 through the L-shaped through groove 20. At this time, the pressure in the first cylinder 12 and the oil tank 1 is released. It can effectively alleviate the overpressure condition of the oil tank 1, protect the metal material of the oil tank 1 in advance, prevent the oil tank 1 from irreversible deformation, and protect the various components of the transformer before the gas relay 10 takes effect. It can also have a positive effect on the safety of the power grid and equipment. The insulating oil flowing into the second cylinder 18 will eventually flow into the oil level gauge 25, which is convenient for the operation and maintenance personnel to observe in time during the inspection. The load overpressure condition of the transformer can be judged and adjusted in time, which is conducive to reducing the risk of the gas relay 10 alarming or tripping due to faults such as transformer overpressure, and also plays a protective and preventive role for the power grid and electrical equipment.

[0043] As a technical optimization solution of the present invention, a plurality of radiators 2 are installed on the side wall of the oil tank 1, a coil is installed inside the oil tank 1, six terminals 4 are fixedly installed on the top of the cover plate 3, and a dryer 7 is fixedly connected to the top of the oil pillow 6 through a pipeline. The radiator 2 is used to conduct the heat generated during the operation of the transformer to keep the transformer temperature within the limit. Three of the six terminals 4 are connected to the input coil, and the other three are connected to the output coil. The dryer 7 is connected to the oil pillow 6, which can absorb moisture in the air during the operation to prevent moisture from entering the insulating oil and affecting the physical properties of the insulating oil.

[0044] As a technical optimization scheme of the present invention, first manual valves 81 are installed on the first oil pipes 8 on both sides of the gas relay 10, and second manual valves 91 are installed on the second oil pipe 9 on one side of the gas relay 10. During normal use of the transformer, the two first manual valves 81 and the one second manual valve 91 are both in the open state. At this time, the main protection gas relay 10 and the pressure relief component 19 jointly play a protective function to ensure the safe use of the transformer. When regular maintenance of the gas relay 10 is required, the two first manual valves 81 can be manually closed to isolate the gas relay 10 from the oil tank 1 to perform non-stop maintenance without affecting the normal power supply of the transformer. At this time, the pressure relief component 19 can be used as temporary protection. The maintenance personnel can judge the working state of the transformer by observing the oil level height of the oil level gauge 25. After the maintenance of the gas relay 10 is completed, the first manual valve 81 close to the side of the oil pillow 6 is opened first, and the other first manual valve 81 is opened after the gas relay 10 is filled with insulating oil, and the gas relay 10 is put into use.

[0045] As a technical optimization solution of the present invention, an air valve 121 is fixedly installed at the top of the first cylinder 12, and the air valve 121 is connected to the internal cavity of the first cylinder 12, and the internal cavity of the first cylinder 12 is connected to the oil tank 1 through a pipeline. When the first cylinder 12 is put into use, the air valve 121 injects insulating oil into the first cylinder 12 through the second oil pipe 9 and discharges the air in the first cylinder 12 through the air valve 121. After the air is discharged, the air valve 121 is closed, which can effectively prevent the air in the first cylinder 12 from mixing into the insulating oil and flowing into the oil tank 1 to affect the insulating effect of the insulating oil.

[0046] As a technical optimization solution of the present invention, a filter 14 is sleeved on the outside of the sleeve 16, and the outside of the filter 14 is slidably connected to the inner wall of the internal cavity of the first cylinder 12. A filter screen and an adsorption chamber are arranged inside the filter 14. As the workload of the transformer changes, the temperature and pressure of the insulating oil also change. The insulating oil circulates between the oil pillow 6 and the oil tank 1. As the transformer is used for a longer time, the metal material of the transformer will decompose impurities and mix into the insulating oil. These impurities will also affect the normal operation of the insulating oil. At this time, part of the insulating oil that flows into the first cylinder 12 through the second oil pipe 9 can be filtered by the filter 14 to reduce impurities. As the working time of the transformer increases, the insulating oil circulates back and forth. The filter 14 can effectively reduce the impurity content in the insulating oil, which can improve the use effect and service life of the insulating oil, and can also protect the transformer and reduce the impact of impurities on the transformer coil and magnetic field.

[0047] As a technical optimization solution of the present invention, a second spring 22 sleeved on the connecting rod 21 is fixedly connected between one side of the annular slider 23 and the inner wall of the second cylinder 18, and the action pressure of the second spring 22 is less than the action pressure of the gas relay 10. During the operation of the gas relay 10, the oil pressure and oil temperature in the oil tank 1 gradually increase with the overpressure use of the transformer, but when the increase range is still within the safe range, the gas relay 10 will not act at this time, but continuous overpressure operation will cause irreversible deformation of the transformer shell material and will also affect the service life of the coil. Therefore, the overpressure use of the transformer is observed through the action of the pressure relief component 19, so it is necessary to set the action pressure value of the second spring 22 to be less than the action pressure value of the gas relay 10, so that the overpressure of the transformer can be effectively observed before the light gas protection action of the transformer occurs, and the load can be reduced or shared in advance to protect the safety of the power grid and equipment, and reduce the probability of electrical hazards or even transformer fires.

[0048] As a technical optimization solution of the present invention, an inclined oil groove 24 is provided at the bottom of the inner cavity of the second cylinder 18, one end of the inclined oil groove 24 is connected to the matching groove, and the other end of the inclined oil groove 24 is connected to the oil level gauge 25. When the pressure relief assembly 19 is actuated, the insulating oil in the first cylinder 12 flows into the second cylinder 18 through the L-shaped through groove 20 and flows into the oil level gauge 25 through the inclined oil groove 24, which can be observed and recorded by the operation and maintenance personnel during the inspection. The overpressure condition of the transformer can be judged by the oil level of the oil level gauge 25, and then the working state of each component in the transformer can be judged, providing an analysis basis for later maintenance.

[0049] As a technical optimization solution of the present invention, two sliding rods 27 are symmetrically connected to the side wall of the annular slider 23, and two fixed sleeves 26 are symmetrically connected to the side wall of the inner cavity of the second cylinder 18. One side of the two sliding rods 27 is respectively slidably connected to the two fixed sleeves 26, and an air cavity 28 is formed between the fixed sleeves 26 and the sliding rods 27. When the oil pressure in the oil tank 1 is high, the pressure plate 34 is squeezed, and the gas stored in the pressure plate 34 is pressed into the connecting pipe 33, the air pipe 29 and finally filled into the air cavity 28. The sliding rod 27 can be pushed by the air pressure to slide along the fixed sleeve 26 and drive the annular slider 23 to disengage from the matching groove, so that the insulating oil in the first cylinder 12 can flow into the second cylinder 18 for pressure relief. The setting of the L-shaped through groove 20 can prevent the oil pressure in the first cylinder 12 from directly acting on the annular slider 23 and causing malfunction of the pressure relief component 19 when the transformer is working normally.

[0050] As a technical optimization solution of the present invention, two air pipes 29 are fixedly connected on both sides of the second cylinder 18, and the top ends of the two air pipes 29 are respectively inserted into the two air cavities 28, and the bottom ends of the two air pipes 29 are connected to the switch 30 located between the second cylinder 18 and the cooling component 31. The bottom of the switch 30 is fixedly connected to an external connecting pipe 35, and a joint is provided at the bottom of the external connecting pipe 35. Under normal conditions, the connecting pipe 33 is connected to the two air pipes 29 through the built-in switching valve of the switch 30, so that the pressure relief component 19 can normally play the function of pressure relief protection. When the operation and maintenance personnel observe that the transformer is continuously in an overpressure operation state, the two air pipes 29 can be connected to the external connecting pipe 35 by manually switching the valve of the switch 30. At this time, the operation and maintenance personnel can actively fill the compressed gas into the air cavity 28 by connecting an external air pump to force the pressure relief component 19 to work, perform pressure relief protection, and prevent safety failure problems in the transformer.

[0051] As a technical optimization solution of the present invention, the cooling component 31 includes a cooling chamber 32, an airbag 331 is installed on the top of the connecting pipe 33, a cooler is fixedly installed on the top of the cover plate 3, a cooling chamber 32 is opened in the cooler, the airbag 331 is wrapped in the cooling chamber 32, the normal diameter of the airbag 331 is smaller than the diameter of the cooling chamber 32, and the top of the connecting pipe 33 is connected to the switch 30. When the transformer is working normally, the insulating oil pressure in the oil tank 1 increases or decreases with the increase or decrease of the transformer load. At this time, the pressure state of the pressure plate 34 also changes accordingly. Under the action of the oil pressure, the gas in the pressure plate 34 will be squeezed into the airbag 331, and the airbag 331 will expand and abut against the cooling cavity 32. The temperature carried in the gas can be reduced by the cooling effect of the cooler, and the airbag 331 will shrink. This cycle forms a breathing-like action, which can effectively bring out the heat of the insulating oil in the oil tank 1, ensure the normal operation of the insulating oil, and reduce the possibility of damage to the transformer material, thereby extending the working life. When the transformer continues to work at overpressure, the airbag 331 continues to expand and abut against the cooling cavity 32, and the air pressure can act on the air cavity 28 to drive the annular slider 23 to move for pressure relief. The setting of the cooling component 31 does not affect the normal operation of the pressure relief component 19.

[0052] When the present invention is in use, when the transformer is in normal working state, the oil tank 1 is filled with insulating oil. As the transformer load changes, the temperature and pressure of the insulating oil also change accordingly, and circulate and exchange with the insulating oil stored in the oil pillow 6. The second oil pipe 9 serves as a branch of the first oil pipe 8, and the insulating oil circulation between the oil pillow 6 and the oil tank 1 can be divided into two paths, one path passes through the gas relay 10, and the other path flows into the oil tank 1 through the first cylinder 12. The insulating oil flowing into the first cylinder 12 first impacts the conical end of the conical slider 15, pushing the conical slider 15 to slide along the sleeve 16 and compressing the first spring 17. At this time, the insulating oil flows into the first cylinder 12 and flows into the oil tank 1 through the filter 14. This part of the insulating oil can Impurities are reduced by filtering through the filter 14. As the transformer runs and the load changes, the pressure and temperature of the insulating oil also change. When the pressure increases, the insulating oil flows back into the oil pillow 6. Since the first spring 17 fails to reset, it pushes the conical slider 15 to seal the connection between the first cylinder 12 and the second oil pipe 9. At this time, the reflux insulating oil can only flow back through the first oil pipe 8 and the gas relay 10. At the same time, under the action of oil pressure, the gas in the pressure plate 34 will be squeezed into the airbag 331, and the airbag 331 will expand and abut against the cooling chamber 32. The temperature carried in the gas can be reduced by the cooling effect of the cooler, and the airbag 331 will shrink. This cycle forms a breathing-like action to dissipate heat.

[0053] When maintenance of the gas relay 10 is required, the two first manual valves 81 can be manually closed to isolate the gas relay 10 from the oil tank 1, so as to carry out non-stop maintenance without affecting the normal power supply of the transformer. At this time, the pressure relief component 19 can be used as temporary protection. After the maintenance of the gas relay 10 is completed, first open the first manual valve 81 close to the side of the oil pillow 6, and then open the other first manual valve 81 after the gas relay 10 is filled with insulating oil, and put the gas relay 10 into use.

[0054] When the transformer continues to operate at overpressure but has not reached the light gas protection alarm condition, the insulating oil pressure in the oil tank 1 increases, and by squeezing the pressure plate 34, the gas stored in the pressure plate 34 is pressed into the connecting pipe 33, the air pipe 29 and finally filled into the air cavity 28. The sliding rod 27 can be pushed by air pressure to slide along the fixed sleeve 26 and drive the annular slider 23 to disengage from the matching groove, so that the insulating oil in the first cylinder 12 flows into the second cylinder 18 through the L-shaped groove 20, and flows into the oil level gauge 25 through the inclined oil groove 24. It can be observed and recorded by the operation and maintenance personnel during the inspection. When the operation and maintenance personnel observe that the transformer is continuously in an overpressure operation state, the two air pipes 29 can be connected to the external connecting pipe 35 by manually switching the valve of the switch 30. At this time, the operation and maintenance personnel can actively fill the compressed gas into the air cavity 28 by connecting an external air pump to force the pressure relief component 19 to work and perform pressure relief protection.

[0055] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0056] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-safety transformer, comprising an oil tank (1) and an oil pillow (6), characterized in that: The top of the oil tank (1) is fixedly mounted with a cover plate (3), the inner wall of the oil tank (1) is fixedly mounted with a pressure plate (34), the top of the pressure plate (34) is connected with a connecting pipe (33), the top of the connecting pipe (33) passes through the cover plate (3), the top of the connecting pipe (33) is provided with a cooling assembly (31), a fixing frame (5) is fixedly mounted on one side of the oil tank (1), an oil pillow (6) is fixedly mounted on the top of the fixing frame (5), the bottom of the oil pillow (6) is fixedly connected with a first oil pipe (8), the end of the first oil pipe (8) passes into the oil tank (1), the middle of the first oil pipe (8) is fixedly connected with a gas relay (10), the oil pillow (6) and the gas relay are connected. A second oil pipe (9) is fixedly connected to a first oil pipe (8) between the two oil pumps (10); a mounting frame (11) is fixedly connected to one side of the cover plate (3); a first cylinder (12) is fixedly mounted on the top of the mounting frame (11); a single-pass component (13) is provided in the inner cavity of the first cylinder (12); the center of one side of the first cylinder (12) is connected to the second oil pipe (9); the other side of the first cylinder (12) is an open structure and is fixedly connected to a second cylinder (18) mounted on the top of the mounting frame (11); an oil level gauge (25) is fixedly mounted on one side of the bottom of the second cylinder (18); and a pressure relief component (19) is provided inside the second cylinder (18); The single-pass component (13) comprises a conical slider (15) and a first spring (17); a sleeve (16) whose end is fixedly connected to the side wall of the second cylinder (18) is arranged at the center of the first cylinder (12); the conical slider (15) is slidably connected to one side of the sleeve (16); and the first spring (17) is fixedly connected between one side of the conical slider (15) and the side wall of the second cylinder (18); The pressure relief assembly (19) comprises an L-shaped through groove (20) and an annular slider (23); a connecting rod (21) is fixedly connected to the center of the interior of the second cylinder (18); the connecting rod (21) is slidably connected to the annular slider (23) on the side close to the first cylinder (12); a matching groove matched with the annular slider (23) is provided on one side of the internal cavity of the second cylinder (18); a plurality of L-shaped through grooves (20) are provided in the matching groove; and the ends of the L-shaped through grooves (20) are connected to the first cylinder (12).

2. A high-safety transformer according to claim 1, characterized in that: A plurality of radiators (2) are installed on the side wall of the oil tank (1), a coil is installed inside the oil tank (1), six wiring terminals (4) are fixedly installed on the top of the cover plate (3), and a dryer (7) is fixedly connected to the top of the oil pillow (6) through a pipeline.

3. A high-safety transformer according to claim 1, characterized in that: A first manual valve (81) is installed on each of the first oil pipes (8) on both sides of the gas relay (10), and a second manual valve (91) is installed on the second oil pipe (9) on one side of the gas relay (10).

4. A high-safety transformer according to claim 1, characterized in that: An air valve (121) is fixedly mounted on the top of the first cylinder (12); the air valve (121) is connected to the internal cavity of the first cylinder (12); and the internal cavity of the first cylinder (12) is connected to the oil tank (1) through a pipeline.

5. A high-safety transformer according to claim 1, characterized in that: The outer side of the sleeve (16) is sleeved with a filter (14), the outer side of the filter (14) is slidably connected to the inner wall of the inner cavity of the first cylinder (12), and the interior of the filter (14) is provided with a filter screen and an adsorption bin.

6. A high-safety transformer according to claim 1, characterized in that: A second spring (22) sleeved on a connecting rod (21) is fixedly connected between one side of the annular slider (23) and the inner wall of the second cylinder (18), and the operating pressure of the second spring (22) is smaller than the operating pressure of the gas relay (10).

7. A high-safety transformer according to claim 1, characterized in that: An inclined oil groove (24) is provided at the bottom of the inner cavity of the second cylinder (18), one end of the inclined oil groove (24) is connected to the matching groove, and the other end of the inclined oil groove (24) is connected to the oil level gauge (25).

8. A high-safety transformer according to claim 1, characterized in that: The side wall of the annular slider (23) is symmetrically connected to two sliding rods (27), and the side wall of the inner cavity of the second cylinder (18) is symmetrically connected to two fixed sleeves (26). One side of the two sliding rods (27) is respectively slidably connected to the two fixed sleeves (26), and an air cavity (28) is formed between the interior of the fixed sleeve (26) and the sliding rod (27).

9. A high-safety transformer according to claim 8, characterized in that: Two air pipes (29) are fixedly connected to both sides of the second cylinder (18), the top ends of the two air pipes (29) are respectively inserted into the two air cavities (28), and the bottom ends of the two air pipes (29) are connected to a switch (30) located between the second cylinder (18) and the cooling component (31), and the bottom of the switch (30) is fixedly connected to an external connecting pipe (35), and a joint is provided at the bottom end of the external connecting pipe (35).

10. A high-safety transformer according to claim 9, characterized in that: The cooling assembly (31) comprises a cooling cavity (32), an air bag (331) is installed on the top of the connecting pipe (33), a cooler is fixedly installed on the top of the cover plate (3), a cooling cavity (32) is opened in the cooler, the air bag (331) is wrapped in the cooling cavity (32), the normal diameter of the air bag (331) is smaller than the diameter of the cooling cavity (32), and the top of the connecting pipe (33) is connected to the switch (30).

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