Safety transformer and fault early warning structure thereof

Abstract

The invention discloses a safety transformer and a fault early warning structure thereof, and belongs to the technical field of transformers, the safety transformer comprises a transformer part and a sealing cover, the top end of the sealing cover is fixedly connected with a test motor through a mounting plate, the output end of the test motor is connected with a test shaft through a chain wheel assembly, and the outer side wall of the test shaft is connected with a plurality of stirring concave plates. Through the arrangement of the pressure relief assembly and the continuous U-shaped pipe, a circuit of the alarm can be switched on by utilizing conductive liquid in the continuous U-shaped pipe under the pushing of carbon dioxide gas, so that the alarm can give out fault early warning of the transformer in time, and a large amount of carbon dioxide gas enters the interior of the transformer; the condition of internal fire caused by continuous heating due to faults in the transformer is avoided as much as possible, meanwhile, through arrangement of a stirring concave plate and a correlation photoelectric sensor, the condition of resistance borne by rotation of the stirring concave plate can be calculated according to the rotating speed condition of a driving wheel, and then the overall aging state of liquid oil is judged.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a safety transformer and a fault warning structure thereof. Background Art

[0002] Oil-immersed transformers use oil as an insulating and cooling medium. Their working principle is to use electromagnetic induction to send high-voltage current into the magnetic core through a high-voltage coil, and then output a corresponding low-voltage current after voltage transformation.

[0003] When a transformer suddenly short-circuits, its high and low voltage windings may simultaneously pass short-circuit currents that are dozens of times the rated value, which will generate a lot of heat and cause the transformer to heat up seriously. When the transformer's ability to withstand short-circuit current is insufficient and its thermal stability is poor, the transformer's insulation material will be seriously damaged, leading to transformer breakdown and damage accidents. In addition, in order to ensure the sealing of oil-immersed transformers, the state of the internal liquid oil cannot be observed during daily maintenance, and the aging of the liquid oil cannot be discovered in time. The aging of the liquid oil in the oil-immersed transformer will generate harmful substances, reduce the breakdown voltage and volume resistivity of the insulating paper, increase dielectric loss, and ultimately lead to thermal breakdown. For this reason, a safe transformer and its fault warning structure are proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that when a transformer suddenly short-circuits, its high and low voltage windings may simultaneously pass short-circuit currents that are dozens of times the rated value, which will generate a lot of heat and cause the transformer to heat up seriously. When the transformer's ability to withstand the short-circuit current is insufficient and its thermal stability is poor, the transformer's insulation material will be seriously damaged. A safe transformer and its fault warning structure are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A safety transformer and a fault warning structure thereof, comprising a transformer component and a cover, wherein the top end of the cover is fixedly connected to a test motor via a mounting plate, the output end of the test motor is connected to a test shaft via a sprocket assembly, the outer side wall of the test shaft is connected to a plurality of stirring concave plates, a protective shell is arranged outside the sprocket assembly, and a through-beam photoelectric sensor is fixedly connected to the inner side wall of the protective shell; Two monitoring tubes are provided below the left and right sides of the cover, the top of the monitoring tube is connected to a continuous U-tube through a pressure relief assembly, a conducting tube is provided inside the continuous U-tube, an outer wall of the conducting tube is fixedly connected to an alarm through two fixing plates, an observation tube is provided above the middle side wall of the continuous U-tube, and an indicating piston plate is provided inside the observation tube.

[0006] Preferably, the top end of the transformer component is fixedly connected to the bottom end of the cover, and protective covers are provided on the outsides of the test motor and the observation tube.

[0007] Preferably, the sprocket assembly consists of a driving wheel, a transmission chain and a driven wheel, the output end of the test motor is fixedly connected to the driving wheel through a driving shaft, the driving wheel is connected to the driven wheel through a transmission chain, and the driven wheel is fixedly connected to multiple stirring concave plates through the test shaft.

[0008] Preferably, the outer side wall of the protective shell is fixedly connected to the cover, the protective shell is rotationally connected to the drive shaft and the test shaft respectively, and a sensing plate opposite to the opposing photoelectric sensor is fixedly connected to the end face edge of the driving wheel.

[0009] Preferably, the monitoring tube is filled with a carbonic acid solution, the continuous U-tube is a structure of three continuously connected U-shaped tubes, and is bilaterally symmetrical, the U-shaped tubes on both sides of the continuous U-tube are filled with conductive liquid, and the liquid level of the conductive liquid is higher than the horizontal height of the conductive tube.

[0010] Preferably, the pressure relief assembly consists of a pressure relief hood and a plurality of pressure relief plates, the monitoring tube is connected to the end of the continuous U-tube through the pressure relief hood, a baffle is fixedly connected to the inner wall of the end of the continuous U-tube, a plurality of pressure relief holes are opened on the side wall of the pressure relief hood, and the inner wall of the pressure relief hole is fixedly connected to the pressure relief plate.

[0011] Preferably, an independent power supply is arranged outside the conducting tube, the alarm is arranged above the conducting tube, and two conductive rods penetrating into the continuous U tube are respectively fixedly connected to both sides of the alarm.

[0012] Preferably, the continuous U-tube is connected to the bottom of the observation tube through a transfer tube, the inner side wall of the observation tube is slidingly connected to the side wall of the indicating piston plate, the bottom end of the indicating piston plate is fixedly connected to the bottom end of the observation tube through a reset spring, and the observation tube is made of transparent material and is printed with scales.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. This scheme, through the setting of the stirring concave plate and the corresponding photoelectric sensor, can use the rotation speed of the driving wheel to calculate the resistance to the rotation of the stirring concave plate, and then judge the overall aging state of the liquid oil, so as to facilitate the intuitive detection of the aging state of the liquid oil without turning on the transformer, so that the aging state of the liquid oil can be warned in time later.

[0014] 2. Through the setting of the piston plate and the observation tube, this scheme can use the less decomposed carbon dioxide to push the piston plate upward in the observation tube, so that maintenance personnel can directly judge the temperature status in the transformer component through the position of the piston plate in the observation tube during daily maintenance, making the entire maintenance process more convenient and quick.

[0015] 3. Through the setting of the pressure relief component and the continuous U-tube, this scheme can use the conductive liquid in the continuous U-tube to conduct the circuit of the alarm under the impetus of carbon dioxide gas, so that the alarm can issue a transformer fault warning in time and allow a large amount of carbon dioxide gas to enter the interior of the transformer, thereby avoiding the internal fire of the transformer due to continuous heating caused by the fault as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional structural schematic diagram of a safety transformer and its fault warning structure proposed by the present invention; Figure 2 An assembly diagram of a safety transformer and a fault warning structure thereof proposed by the present invention; Figure 3 for Figure 2 The enlarged view of point A in the middle; Figure 4 A schematic structural diagram of the position of a stirring concave plate and a protective housing in a safety transformer and a fault warning structure thereof proposed by the present invention; Figure 5 A schematic diagram of the structure of a safety transformer and a sprocket assembly in a fault warning structure thereof proposed by the present invention; Figure 6 This is a structural schematic diagram of the positions of the continuous U tube and two monitoring tubes in a safety transformer and its fault warning structure proposed by the present invention; Figure 7 A schematic diagram of the structure of a safety transformer and a pressure relief component in a fault warning structure thereof proposed by the present invention; Figure 8 The present invention provides a safety transformer and a schematic diagram of the structure inside an observation tube in its fault warning structure.

[0017] In the figure: 1. Transformer; 2. Sealing cover; 3. Test motor; 4. Driving wheel; 5. Transmission chain; 6. Driven wheel; 7. Test shaft; 8. Stirring concave plate; 9. Protective shell; 10. Through-beam photoelectric sensor; 11. Monitoring tube; 12. Continuous U tube; 13. Pressure relief cover; 14. Pressure relief plate; 15. Baffle; 16. Conductive tube; 17. Conductive rod; 18. Alarm; 19. Transfer tube; 20. Reset spring; 21. Piston plate; 22. Observation tube. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Example, see Figures 1 to 8 A safety transformer and its fault warning structure, comprising a transformer component 1 and a cover 2, the top of the cover 2 is fixedly connected to a test motor 3 through a mounting plate, the output end of the test motor 3 is connected to a test shaft 7 through a sprocket assembly, a plurality of stirring concave plates 8 are connected to the outer wall of the test shaft 7, a protective shell 9 is arranged outside the sprocket assembly, and a through-beam photoelectric sensor 10 is fixedly connected to the inner wall of the protective shell 9; Furthermore, the top of the transformer 1 is fixedly connected to the bottom of the cover 2, and protective covers are provided on the outside of the test motor 3 and the observation tube 22. The sprocket assembly consists of a driving wheel 4, a transmission chain 5 and a driven wheel 6. The output end of the test motor 3 is fixedly connected to the driving wheel 4 through a driving shaft, and the driving wheel 4 is connected to the driven wheel 6 through a transmission chain 5. The driven wheel 6 is fixedly connected to a plurality of stirring concave plates 8 through a test shaft 7. The outer wall of the protective shell 9 is fixedly connected to the cover 2, and the protective shell 9 is rotatably connected to the driving shaft and the test shaft 7 respectively. A sensing plate opposite to the opposing photoelectric sensor 10 is fixedly connected to the end face edge of the driving wheel 4; It should be noted that: the transformer component 1 and the cover 2 are assembled in a sealed manner. After assembly, multiple stirring concave plates 8 will be immersed in the liquid oil of the transformer component 1. When the maintenance personnel detect the state of the liquid oil in the transformer component 1, the test motor 3 is controlled to start under the rated voltage state. The test motor 3 drives the driving wheel 4 to rotate through the driving shaft. The driving wheel 4 rotates and drives the driven wheel 6 to rotate together through the transmission chain 5. The driven wheel 6 rotates and rotates together through the test shaft 7, thereby driving multiple stirring concave plates 8 to rotate in the liquid oil. As the aged transformer oil becomes turbid and the overall viscosity increases, the stirring resistance of the stirring concave plates 8 increases, thereby reducing the rotation speed of the driving wheel 4. The opposite photoelectric sensor 10 measures the rotation speed of the driving wheel 4 through the induction plate on the edge of the end face of the driving wheel 4. The maintenance personnel record the rotation speed during each maintenance for comparison during the next maintenance. The above advantages are: in this way, the speed of the driving wheel 4 can be used to infer the resistance to the rotation of the stirring concave plate 8, and then the overall aging state of the liquid oil can be judged, which is convenient for intuitively detecting the aging state of the liquid oil without turning on the transformer, so that the aging state of the liquid oil can be promptly warned in the future; Two monitoring tubes 11 are arranged below the left and right sides of the cover 2. The top of the monitoring tube 11 is connected to a continuous U-tube 12 through a pressure relief assembly. A conducting tube 16 is arranged inside the continuous U-tube 12. An alarm 18 is fixedly connected to the outer wall of the conducting tube 16 through two fixing plates. Further, the monitoring tube 11 is filled with a carbonic acid solution, the continuous U-tube 12 is a structure of three continuously connected U-tubes, and is bilaterally symmetrical, the U-tubes on both sides of the continuous U-tube 12 are filled with a conductive liquid, the liquid level of the conductive liquid is higher than the horizontal height of the conducting tube 16, the pressure relief assembly is composed of a pressure relief cover 13 and a plurality of pressure relief plates 14, the monitoring tube 11 is connected to the end of the continuous U-tube 12 through the pressure relief cover 13, the inner side wall of the end of the continuous U-tube 12 is fixedly connected with a baffle 15, the side wall of the pressure relief cover 13 is provided with a plurality of pressure relief holes, the inner side wall of the pressure relief hole is fixedly connected with the pressure relief plate 14, the conducting tube 16 is provided with an independent power supply outside, the alarm 18 is arranged above the conducting tube 16, and two conductive rods 17 penetrating into the continuous U-tube 12 are fixedly connected on both sides of the alarm 18; It should be noted that: when a heating fault occurs in the transformer 1, the carbonic acid solution in the monitoring tube 11 will be decomposed into carbon dioxide gas by heat (wherein the monitoring tube 11 has a certain heat insulation performance to ensure that the carbonic acid solution will not be decomposed by heat when the transformer 1 is in normal use). If only a small amount of carbon dioxide is decomposed, the decomposed carbon dioxide gas will enter the pressure relief cover 13 and enter the continuous U-tube 12 through the baffle 15. The carbon dioxide gas will press the conductive liquid in the U-tube next to the continuous U-tube 12. When one end of the conductive liquid is pressurized, it will compress the space at the other end. Then the continuous U-tube 12 is located in the middle. The U-tube space between the two ends will be compressed, and the compressed gas enters the bottom of the observation tube 22 through the transfer tube 19, pushing the piston plate 21 and stretching the reset spring 20. In the process of daily maintenance, by observing the scale position on the transparent observation tube 22 where the piston plate 21 is located, the temperature inside the transformer 1 can be known. If the piston plate 21 rises to a small height and the alarm 18 does not sound an alarm, it means that there is a small temperature rise inside the transformer 1. At this time, a complete maintenance is required to eliminate minor faults. After the temperature returns to normal, the reset spring 20 will drive the piston plate 21 to reset, so that the carbon dioxide will dissolve again. The above advantages are as follows: in this way, the less carbon dioxide decomposed can be used to push the piston plate 21 upward in the observation tube 22, which is convenient for maintenance personnel to directly judge the temperature state in the transformer 1 through the position of the piston plate 21 in the observation tube 22 during daily maintenance, making the entire maintenance process more convenient and quick; An observation tube 22 is provided above the middle side wall of the continuous U-tube 12, and an indicating piston plate 21 is provided in the observation tube 22; Furthermore, the continuous U tube 12 is connected to the bottom of the observation tube 22 through the transfer tube 19, the inner wall of the observation tube 22 is slidingly connected to the side wall of the indicating piston plate 21, and the bottom end of the indicating piston plate 21 is fixedly connected to the bottom end of the observation tube 22 through the return spring 20. The observation tube 22 is made of transparent material and is printed with scales.

[0022] It should be noted that: when a large heating fault occurs in the transformer 1, a large amount of carbon dioxide will be decomposed in the monitoring tube 11 in a short time, and the baffle 15 will prevent the carbon dioxide gas from quickly entering the continuous U tube 12, then the carbon dioxide in the pressure relief cover 13 will increase, and the internal air pressure will gradually increase. In this process, the carbon dioxide gas that continuously enters the continuous U tube 12 will press the conductive liquid, causing the liquid level at the other end of the conductive liquid to rise continuously and contact with the conductive rod 17, thereby connecting the circuit between the two conductive rods 17 and the conductive tube 16, so that the alarm 1 8 is activated by the independent power supply of the conducting tube 16, so that the activated alarm 18 continues to sound the alarm, warning the surrounding transformer 1 that there is an abnormal temperature rise inside, which poses a safety hazard. The alarm 18 will send a feedback signal to the outside at the moment of activation, so that the staff can find and deal with it in time. At the same time, the air pressure in the pressure relief cover 13 continues to increase, which will burst the pressure relief sheet 14, so that the carbon dioxide gas in the pressure relief cover 13 enters the transformer 1, and a large amount of carbon dioxide gas is retained in the transformer 1, which greatly reduces the safety hazard of internal fire due to high temperature in the transformer 1; The above advantages are as follows: in this way, the conductive liquid in the continuous U tube 12 can be used to conduct the circuit of the alarm 18 under the impetus of the carbon dioxide gas, so that the alarm 18 can issue a transformer fault warning in time, and a large amount of carbon dioxide gas can enter the interior of the transformer 1, thereby avoiding the internal fire of the transformer 1 due to continuous heating caused by the fault as much as possible; When the present invention is in use, the transformer component 1 and the cover 2 are assembled in a sealed manner. After assembly, multiple stirring concave plates 8 are immersed in the liquid oil of the transformer component 1. When the maintenance personnel detect the state of the liquid oil in the transformer component 1, the test motor 3 is controlled to start under the rated voltage state. The test motor 3 drives the driving wheel 4 to rotate through the driving shaft. The driving wheel 4 rotates and drives the driven wheel 6 to rotate together through the transmission chain 5. The driven wheel 6 rotates and rotates together through the test shaft 7, thereby driving multiple stirring concave plates 8 to rotate in the liquid oil. Due to aging, the transformer oil will become turbid and the overall viscosity will increase. The degree increases, which increases the stirring resistance of the stirring concave plate 8, thereby reducing the rotation speed of the driving wheel 4. The photoelectric sensor 10 measures the rotation speed of the driving wheel 4 through the induction plate at the edge of the end face of the driving wheel 4. The maintenance personnel record the rotation speed during each maintenance, which is convenient for comparison during the next maintenance. In this way, the rotation speed of the driving wheel 4 can be used to calculate the resistance to the rotation of the stirring concave plate 8, and then the overall aging state of the liquid oil can be judged, which is convenient for intuitively detecting the aging state of the liquid oil without turning on the transformer, so that the aging state of the liquid oil can be timely warned in the future; When a heating fault occurs in the transformer 1, the carbonic acid solution in the monitoring tube 11 will be decomposed into carbon dioxide gas by heat (wherein the monitoring tube 11 has a certain heat insulation performance to ensure that the carbonic acid solution will not be decomposed by heat under normal use of the transformer 1). If only a small amount of carbon dioxide is decomposed, the decomposed carbon dioxide gas will enter the pressure relief cover 13 and enter the continuous U-tube 12 through the baffle 15. The carbon dioxide gas will press the conductive liquid in the U-tube on the side of the continuous U-tube 12. The conductive liquid is compressed at one end and the space at the other end is compressed. The space of the U-tube in the middle of the continuous U-tube 12 is compressed, and the compressed gas enters the bottom of the observation tube 22 through the transfer tube 19, pushing the piston plate 21 and stretching the reset spring. Spring 20, in the process of daily maintenance, by observing the scale position on the transparent observation tube 22 where the piston plate 21 is located, the temperature inside the transformer component 1 can be known. If the piston plate 21 rises to a small height and the alarm 18 does not sound an alarm, it means that there is a small temperature rise inside the transformer component 1. At this time, a complete maintenance is required to eliminate minor faults. After the temperature returns to normal, the reset spring 20 will drive the piston plate 21 to reset, so that the carbon dioxide is redissolved. In this way, the less decomposed carbon dioxide can be used to push the piston plate 21 to move up in the observation tube 22, which is convenient for maintenance personnel to directly judge the temperature state inside the transformer component 1 through the position of the piston plate 21 in the observation tube 22 during daily maintenance, making the entire maintenance process more convenient and quick; When a large heating fault occurs in the transformer 1, a large amount of carbon dioxide will be decomposed in the monitoring tube 11 in a short time, and the baffle 15 will prevent the carbon dioxide gas from quickly entering the continuous U-tube 12, then the carbon dioxide in the pressure relief cover 13 will increase, and the internal air pressure will gradually increase. In this process, the carbon dioxide gas that continuously enters the continuous U-tube 12 will press the conductive liquid, causing the liquid level at the other end of the conductive liquid to continue to rise and contact with the conductive rod 17, thereby connecting the circuit between the two conductive rods 17 and the conductive tube 16, so that the alarm 18 is activated by the independent power supply of the conductive tube 16, and the activated alarm 18 continues to sound the alarm, warning the surrounding transformer 1 that there is an abnormal temperature rise inside, and there is a safety hazard. The alarm 18 will send a feedback signal to the outside at the moment of activation, so that the staff can find and deal with it in time. At the same time, the air pressure in the pressure relief cover 13 continues to increase, which will burst the pressure relief plate 14, so that the carbon dioxide gas in the pressure relief cover 13 enters the transformer component 1. A large amount of carbon dioxide gas is retained in the transformer component 1, which greatly reduces the safety hazard of internal fire due to high temperature in the transformer component 1. In this way, the conductive liquid in the continuous U tube 12 can be used to conduct the circuit of the alarm 18 under the impetus of carbon dioxide gas, so that the alarm 18 can issue a transformer fault warning in time, and allow a large amount of carbon dioxide gas to enter the interior of the transformer component 1, avoiding the internal fire caused by continuous heating inside the transformer component 1 due to the fault as much as possible.

[0023] The above description 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 safety transformer and a fault warning structure thereof, comprising a transformer component (1) and a cover (2), characterized in that: The top end of the cover (2) is fixedly connected to a test motor (3) via a mounting plate, the output end of the test motor (3) is connected to a test shaft (7) via a sprocket assembly, the outer side wall of the test shaft (7) is connected to a plurality of stirring concave plates (8), a protective housing (9) is provided on the outer side of the sprocket assembly, and a through-beam photoelectric sensor (10) is fixedly connected to the inner side wall of the protective housing (9); Two monitoring tubes (11) are arranged below the left and right sides of the cover (2); the top of the monitoring tube (11) is connected to a continuous U-tube (12) via a pressure relief assembly; a conducting tube (16) is arranged inside the continuous U-tube (12); an outer wall of the conducting tube (16) is fixedly connected to an alarm (18) via two fixing plates; an observation tube (22) is arranged above the middle side wall of the continuous U-tube (12); an indicating piston plate (21) is arranged inside the observation tube (22).

2. A safety transformer and its fault warning structure according to claim 1, characterized in that: The top end of the transformer component (1) is fixedly connected to the bottom end of the cover (2), and protective covers are provided on the outsides of the test motor (3) and the observation tube (22).

3. A safety transformer and its fault warning structure according to claim 1, characterized in that: The sprocket assembly consists of a driving wheel (4), a transmission chain (5) and a driven wheel (6); the output end of the test motor (3) is fixedly connected to the driving wheel (4) via a driving shaft; the driving wheel (4) is connected to the driven wheel (6) via a transmission chain (5); and the driven wheel (6) is fixedly connected to a plurality of stirring concave plates (8) via a test shaft (7).

4. A safety transformer and its fault warning structure according to claim 3, characterized in that: The outer wall of the protective housing (9) is fixedly connected to the cover (2), the protective housing (9) is rotatably connected to the drive shaft and the test shaft (7) respectively, and a sensing plate opposite to the opposing photoelectric sensor (10) is fixedly connected to the end face edge of the drive wheel (4).

5. A safety transformer and its fault warning structure according to claim 1, characterized in that: The monitoring tube (11) contains a carbonic acid solution, the continuous U-tube (12) is a structure of three continuously connected U-tubes, and is bilaterally symmetrical, the U-tubes on both sides of the continuous U-tube (12) contain a conductive liquid, and the liquid level of the conductive liquid is higher than the level of the conductive tube (16).

6. A safety transformer and its fault warning structure according to claim 1, characterized in that: The pressure relief assembly is composed of a pressure relief cover (13) and a plurality of pressure relief plates (14); the monitoring tube (11) is connected to the end of the continuous U-tube (12) through the pressure relief cover (13); a baffle (15) is fixedly connected to the inner side wall of the end of the continuous U-tube (12); a plurality of pressure relief holes are formed on the side wall of the pressure relief cover (13); and the inner side walls of the pressure relief holes are fixedly connected to the pressure relief plates (14).

7. A safety transformer and its fault warning structure according to claim 1, characterized in that: An independent power supply is arranged outside the conducting tube (16), the alarm (18) is arranged above the conducting tube (16), and two conductive rods (17) penetrating into the continuous U tube (12) are respectively fixedly connected to both sides of the alarm (18).

8. A safety transformer and its fault warning structure according to claim 1, characterized in that: The continuous U-tube (12) is connected to the bottom of the observation tube (22) via a transfer tube (19); the inner side wall of the observation tube (22) is slidably connected to the side wall of the indicating piston plate (21); the bottom end of the indicating piston plate (21) is fixedly connected to the bottom end of the observation tube (22) via a return spring (20); and the observation tube (22) is made of a transparent material and is printed with scale.

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