A safety power transformer

Abstract

The application relates to the technical field of power transformers, and discloses a safe power transformer which comprises a box body, the outer wall of the box body is fixedly provided with a heat dissipation plate, the top of the box body is provided with a pressure release assembly, and the top of the box body is fixedly provided with a contact column. When the pressure in the inner cavity of the box body sharply increases, the pressure plate is pushed upwards, so that the pressure plate moves upwards along the inner wall of the pressure relief pipe; when the pressure plate passes the oil discharge pipe, the insulating oil rapidly enters the oil discharge pipe from the pressure relief pipe, the insulating oil is released, and when the pressure relief pipe is installed, the stroke of the driving spring can be adjusted according to the pressure bearing capacity of the box body, so that the downward pressure of the pressure plate is changed; when pressure relief is realized, the top rod and the lifting plate are pushed to move upwards in the process that the pressure plate moves upwards, so that the conductor is pulled off from the contact column, power supply to the equipment is cut off, the safety of the equipment is further ensured, and explosion is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transformers, in particular to a safe power transformer. BACKGROUND

[0002] The power transformer is a kind of static electrical equipment, which is used to change the AC voltage (current) of a certain value into the AC voltage (current) of another value or several values with the same frequency, and is a static device with two or more windings, wherein the oil-immersed power transformer is more suitable for the power grid transformation in cities and towns, industrial and mining enterprises, and is more suitable for combined transformers and pre-installed transformers.

[0003] The traditional oil-immersed power transformer device is filled with a large amount of insulating oil in the inner cavity of the oil-immersed power transformer during use. In order to ensure the stable operation of the device, an explosion-proof pipe is often arranged at the top of the power transformer, which can timely release the insulating oil in the transformer to the outside in case of emergency. The traditional explosion-proof pipe is usually provided with a film at the top. When the pressure in the transformer increases rapidly, the insulating oil will break through the film to release the pressure of the transformer. The traditional film needs to be customized according to the pressure bearing capacity of the transformer during installation and use, so that the pressure can be released in the first time in case of danger. After the film is broken, it cannot be reused and needs to be reinstalled, which leads to many limitations of the traditional explosion-proof pipe in use and makes it inconvenient to use. SUMMARY

[0004] The present application provides a safe power transformer, which solves the problems raised in the background art.

[0005] The present application provides the following technical scheme: a safe power transformer, comprising a box body, a heat dissipation plate is fixedly arranged on the outer wall of the box body, a pressure release assembly is arranged at the top of the box body, a contact column is fixedly arranged on the top of the box body, a wire is arranged on the outer wall of the contact column, a push-pull assembly is arranged at the top of the pressure release assembly, an oil discharge assembly is arranged at the top of the box body, a connecting hole is formed in the outer wall of the box body, and a supporting base is arranged at the bottom of the box body.

[0006] As a preferred technical scheme of the present application: the pressure release assembly comprises a pressure relief pipe, a fixed groove is formed in the inner cavity of the pressure relief pipe, a moving groove is formed in the inner cavity of the pressure relief pipe, a fixed rod is fixedly arranged on the inner wall of the fixed groove, a moving plate is movably sleeved on the outer wall of the fixed rod, a pressure plate is fixedly arranged on the outer wall of the moving plate, a driving spring is movably sleeved on the outer wall of the fixed rod, a lower pressing plate is movably sleeved on the outer wall of the fixed rod, a pushing plate is fixedly arranged on the outer wall of the lower pressing plate, an adjusting nut is threadedly connected with the outer wall of the fixed rod, a fixed cylinder is arranged at the top of the pressure relief pipe, and an oil discharge pipe is fixedly arranged on the outer wall of the pressure relief pipe.

[0007] As a preferred technical scheme of the present application: the inner wall diameter of the fixed groove is greater than the inner wall diameter of the moving groove, the outer wall of the drive spring is in contact with the outer wall of the moving plate and the lower pressing plate respectively, and the drive spring is made of high carbon steel, the outer wall of the push plate is connected with the outer wall of the lower pressing plate through the inner cavity of the pressure relief pipe, the inner cavity of the oil discharge pipe is communicated with the inner cavity of the fixed groove, and the inner cavity of the pressure relief pipe is communicated with the inner cavity of the box body.

[0008] As a preferred technical scheme of the present application: the push-pull assembly comprises a top rod, the outer wall of the top rod is fixedly assembled with a mounting plate, the outer wall of the mounting plate is provided with a lifting plate, and the outer wall of the lifting plate is provided with a fixing hole.

[0009] As a preferred technical scheme of the present application: the outer wall of the top rod is connected with the outer wall of the moving plate through the inner cavity of the fixed cylinder, and the outer wall diameter of the top rod is equal to the inner wall diameter of the fixed cylinder, the inner wall diameter of the fixing hole is equal to the outer wall diameter of the wire, and the inner wall of the fixing hole is connected with the outer wall of the wire.

[0010] As a preferred technical scheme of the present application: the oil discharge assembly comprises a mounting frame, the outer wall of the mounting frame is fixedly assembled with an oil pillow, the outer wall of the oil pillow is provided with a connecting pipe, the outer wall of the connecting pipe is provided with a respirator, the bottom of the respirator is fixedly assembled with an inner cylinder, the bottom of the respirator is provided with an outer cylinder, the outer wall of the outer cylinder is provided with a breathable hole, the outer wall of the outer cylinder is fixedly assembled with a limiting rod, the outer wall of the limiting rod is movably sleeved with a lifting ring, the outer wall of the lifting ring is fixedly assembled with a connecting rod, the outer wall of the connecting rod is fixedly assembled with a cleaning plate, the outer wall of the lifting ring is fixedly assembled with a lifting frame, the outer wall of the lifting frame is fixedly assembled with a drive motor, and the power output shaft of the drive motor is fixedly assembled with a drive screw.

[0011] As a preferred technical scheme of the present application: the inner wall diameter of the breathable hole is equal to the outer wall diameter of the cleaning plate, the outer wall diameter of the connecting rod is smaller than the inner wall diameter of the breathable hole, and the outer wall of the drive screw is threadedly connected with the inner wall of the lifting frame.

[0012] As a preferred technical scheme of the present application: the inner cavity of the connecting pipe is communicated with the inner cavity of the oil pillow, the inner cavity of the oil pillow is communicated with the inner cavity of the box body, and the length of the outer wall of the connecting rod is greater than the depth of the inner cavity of the breathable hole.

[0013] As a preferred technical scheme of the present application: the inner cavity of the respirator is filled with water-absorbing silica gel, and the inner cavity of the inner cylinder is communicated with the inner cavity of the respirator.

[0014] As a preferred technical scheme of the present application: the number of the limiting rods is two, and the two limiting rods are respectively installed on the two sides of the outer wall of the outer cylinder, and the cleaning plate is made of natural rubber.

[0015] The present application has the following advantages:

[0016] 1. The safety power transformer, by setting the pressure relief pipe on the bottom of the box, and setting the pressure plate in the inner cavity of the pressure relief pipe, when the pressure in the inner cavity of the box increases rapidly, the pressure plate will be pushed upward, so that the pressure plate moves upward along the inner wall of the pressure relief pipe, when the pressure plate passes through the oil drain pipe, the insulating oil will quickly enter the oil drain pipe from the pressure relief pipe, releasing the insulating oil, so that the insulating oil in the box can be quickly released, and when installing the pressure relief pipe, the stroke of the driving spring can be adjusted according to the size of the pressure that the box can withstand, so as to change the downward pressure of the pressure plate, so that the pressure relief pipe can be applied to more size transformers, and when realizing pressure relief, the top rod and the lifting plate will move upward during the upward movement of the pressure plate, so as to pull the wire off the contact column, realize the power-off of the equipment, further ensure the safety of the equipment, and avoid the occurrence of explosion.

[0017] 2. The safety power transformer, by setting the connecting rod and the cleaning plate on the outer wall of the outer cylinder, under the action of the driving motor, the lifting frame can be driven to move downward along the outer wall of the limiting rod, at this time, the inner wall of the air hole can be cleaned under the action of the cleaning plate, so that the dirt attached to the inner wall of the air hole can be scraped off under the action of the cleaning plate, avoiding the air hole from being blocked, so that the equipment can normally inhale and exhale, thereby better realizing the protection of the oil liquid in the inner cavity of the oil pillow. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0019] Figure 2 is a schematic diagram of the box structure of the present application;

[0020] Figure 3 is a schematic diagram of the support base structure of the present application;

[0021] Figure 4 is a schematic diagram of the cross-sectional structure of the box of the present application;

[0022] Figure 5 is a schematic diagram of the pressure relief pipe structure of the present application;

[0023] Figure 6 is a schematic diagram of the cross-sectional structure of the pressure relief pipe of the present application;

[0024] Figure 7 is a schematic diagram of the top rod structure of the present application;

[0025] Figure 8 It is the schematic view of the oil pillow structure of the present application;

[0026] Figure 9 It is the schematic view of the respirator structure of the present application;

[0027] Figure 10 It is the schematic view of the lifting frame structure of the present application.

[0028] In the figure: 1, box body; 2, heat dissipation plate; 3, pressure release assembly; 4, contact column; 5, wire; 6, push-pull assembly; 7, oil discharge assembly; 8, connecting hole; 9, supporting base;

[0029] 301, pressure relief pipe; 302, fixed groove; 303, moving groove; 304, fixed rod; 305, moving plate; 306, pressure plate; 307, drive spring; 308, lower pressing plate; 309, pushing plate; 3010, adjusting nut; 3011, fixed cylinder; 3012, oil discharge pipe;

[0030] 601, top rod; 602, mounting plate; 603, lifting plate; 604, fixed hole;

[0031] 701, mounting frame; 702, oil pillow; 703, connecting pipe; 704, respirator; 705, inner cylinder; 706, outer cylinder; 707, air hole; 708, limiting rod; 709, lifting ring; 7010, connecting rod; 7011, cleaning plate; 7012, lifting frame; 7013, drive motor; 7014, drive screw. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] Please refer to Figure 1 - Figure 10 A safe power transformer comprises a box body 1, a heat dissipation plate 2 fixedly assembled on the outer wall of the box body 1, a pressure release assembly 3 provided on the top of the box body 1, a contact column 4 fixedly assembled on the top of the box body 1, a wire 5 mounted on the outer wall of the contact column 4, a push-pull assembly 6 provided on the top of the pressure release assembly 3, an oil discharge assembly 7 provided on the top of the box body 1, a connecting hole 8 formed on the outer wall of the box body 1, and a supporting base 9 mounted on the bottom of the box body 1.

[0034] In the structure, the contact column 4 is installed on the top of the box body 1, and the wire 5 is arranged on the top of the contact column 4, so that the power can be transmitted to the outer wall of the contact column 4 under the action of the wire 5, and the external current can be communicated with the winding in the inner cavity of the box body 1 under the action of the contact column 4, thereby realizing the voltage increase of the power.

[0035] In a preferred embodiment: the pressure release assembly 3 comprises a pressure relief pipe 301, the inner cavity of the pressure relief pipe 301 is provided with a fixed groove 302, the inner cavity of the pressure relief pipe 301 is provided with a moving groove 303, the inner wall of the fixed groove 302 is fixedly provided with a fixed rod 304, the outer wall of the fixed rod 304 movably sleeved with a moving plate 305, the outer wall of the moving plate 305 is fixedly provided with a pressure plate 306, the outer wall of the fixed rod 304 movably sleeved with a drive spring 307, the outer wall of the fixed rod 304 movably sleeved with a lower pressing plate 308, the outer wall of the lower pressing plate 308 is fixedly provided with a pushing plate 309, the outer wall of the fixed rod 304 is threadedly connected with an adjusting nut 3010, the top of the pressure relief pipe 301 is provided with a fixed cylinder 3011, and the outer wall of the pressure relief pipe 301 is fixedly provided with an oil discharge pipe 3012.

[0036] In the structure, the fixed rod 304 is arranged in the inner cavity of the pressure relief pipe 301, and the drive spring 307 and the moving plate 305 are arranged on the outer wall of the fixed rod 304, so that the moving plate 305 can be supported under the action of the drive spring 307, so that the outer wall of the pressure plate 306 can be in the inner cavity of the moving groove 303, and the inner cavity of the moving groove 303 is blocked, so that the inner cavity of the moving groove 303 is communicated with the outside, and when the pressure in the inner cavity of the box body 1 increases, the pressure plate 306 can move upward along the inner wall of the moving groove 303, so that the insulating oil in the inner cavity of the box body 1 is discharged outward through the oil discharge pipe 3012.

[0037] In a preferred embodiment: the inner wall diameter of the fixed groove 302 is greater than the inner wall diameter of the moving groove 303, the outer wall of the drive spring 307 is in contact with the outer wall of the moving plate 305 and the lower pressing plate 308 respectively, the drive spring 307 is made of high carbon steel, the outer wall of the pushing plate 309 passes through the inner cavity of the pressure relief pipe 301 and is connected with the outer wall of the lower pressing plate 308, the inner cavity of the oil discharge pipe 3012 is communicated with the inner cavity of the fixed groove 302, and the inner cavity of the pressure relief pipe 301 is communicated with the inner cavity of the box body 1.

[0038] In the structure, when the stroke of the driving spring 307 needs to be adjusted, the adjusting nut 3010 is rotated, the push plate 309 is driven under the action of the adjusting nut 3010, the push plate 309 moves downward along the inner wall of the pressure relief pipe 301, the downward plate 308 is pushed to move, the driving spring 307 is compressed, the stroke of the driving spring 307 is compressed, and the pushing force of the driving spring 307 on the outer wall of the moving plate 305 is further increased.

[0039] In a preferred embodiment, the push-pull assembly 6 comprises a top rod 601, the outer wall of the top rod 601 is fixedly provided with a mounting plate 602, the outer wall of the mounting plate 602 is provided with a lifting plate 603, and the outer wall of the lifting plate 603 is provided with a fixing hole 604.

[0040] In the structure, the top rod 601 is provided, the outer wall of the top rod 601 is connected with the outer wall of the moving plate 305, when the pressure in the inner cavity of the box body 1 sharply increases, the insulating oil is pushed into the inner cavity of the pressure relief pipe 301, and the movement of the pressure plate 306 and the moving plate 305 is pushed, so that the top rod 601 is driven to move upward along the inner cavity of the fixed cylinder 3011.

[0041] In a preferred embodiment, the outer wall of the top rod 601 penetrates the inner cavity of the fixed cylinder 3011 and is connected with the outer wall of the moving plate 305, the outer wall diameter of the top rod 601 is equal to the inner wall diameter of the fixed cylinder 3011, the inner wall diameter of the fixing hole 604 is equal to the outer wall diameter of the wire 5, and the inner wall of the fixing hole 604 is connected with the outer wall of the wire 5.

[0042] In the structure, the mounting plate 602 and the lifting plate 603 are provided on the outer wall of the top rod 601, under the action of the insulating oil, when the top rod 601 moves upward along the inner cavity of the fixed cylinder 3011, the lifting plate 603 is pushed to move during the upward movement of the top rod 601, at this time, the wire 5 is separated from the outer wall of the contact column 4 under the action of the lifting plate 603, and the power-off operation of the box body 1 is realized.

[0043] In one preferred implementation: the oil discharge assembly 7 comprises a mounting frame 701, the outer wall of the mounting frame 701 is fixedly provided with an oil pillow 702, the outer wall of the oil pillow 702 is provided with a connecting pipe 703, the outer wall of the connecting pipe 703 is provided with a breather 704, the bottom of the breather 704 is fixedly provided with an inner cylinder 705, the bottom of the breather 704 is provided with an outer cylinder 706, the outer wall of the outer cylinder 706 is provided with a breathable hole 707, the outer wall of the outer cylinder 706 is fixedly provided with a limiting rod 708, the outer wall of the limiting rod 708 is movably sleeved with a lifting ring 709, the outer wall of the lifting ring 709 is fixedly provided with a connecting rod 7010, the outer wall of the connecting rod 7010 is fixedly provided with a cleaning plate 7011, the outer wall of the lifting ring 709 is fixedly provided with a lifting frame 7012, the outer wall of the lifting frame 7012 is fixedly provided with a drive motor 7013, and the power output shaft of the drive motor 7013 is fixedly provided with a drive screw 7014.

[0044] In the above structure, through the connecting pipe 703 provided on the outer wall of the oil pillow 702 and the breather 704 provided at the bottom of the connecting pipe 703, during normal use of the oil pillow 702, the air in the inner cavity of the oil pillow 702 will be discharged outward as the volume of the insulating oil increases, so that the air in the inner cavity of the oil pillow 702 will be discharged outward through the breather 704, and when the temperature of the insulating oil decreases and its volume shrinks, external air will be sucked into the inner cavity of the oil pillow 702 through the breather 704, and under the action of the water-absorbing silica gel in the inner cavity of the oil pillow 702, water vapor in the air will be prevented from entering the insulating oil, thereby preventing the deterioration of the insulating oil.

[0045] In one preferred implementation: the inner wall diameter of the breathable hole 707 is equal to the outer wall diameter of the cleaning plate 7011, the outer wall diameter of the connecting rod 7010 is smaller than the inner wall diameter of the breathable hole 707, and the outer wall of the drive screw 7014 is threadedly connected with the inner wall of the lifting frame 7012.

[0046] In the above structure, through the breathable hole 707 provided on the outer wall of the outer cylinder 706, when the oil pillow 702 discharges and inhales air, external air will enter the inner cavity of the outer cylinder 706 through the breathable hole 707, and when the inner cavity of the breathable hole 707 is blocked, it will cause poor air intake and air exhaust, by starting the drive motor 7013, under the action of the drive motor 7013, the drive screw 7014 is rotated, and in the process of rotating the drive screw 7014, the lifting frame 7012 can be driven, so that the lifting ring 709 moves downward along the outer wall of the limiting rod 708, and in the process of the lifting ring 709 moving downward, the outer wall of the cleaning plate 7011 will scrape the inner wall of the breathable hole 707, and the attached impurities on the inner wall of the breathable hole 707 will be scraped off.

[0047] In a preferred embodiment: the inner cavity of the connecting pipe 703 is communicated with the inner cavity of the oil pillow 702, the inner cavity of the oil pillow 702 is communicated with the inner cavity of the tank 1, and the outer wall length of the connecting rod 7010 is greater than the inner cavity depth of the air hole 707.

[0048] In the above structure, by adjusting the position of the lifting ring 709 through the connecting rod 7010 arranged on the outer wall of the lifting ring 709, the outer wall of the lifting ring 709 is not in contact with the outer wall of the outer cylinder 706, at this time the cleaning plate 7011 is not in the inner cavity of the air hole 707, which ensures that the lifting ring 709 and the cleaning plate 7011 will not cause blockage to the inner cavity of the air hole 707, thereby ensuring normal air flow.

[0049] In a preferred embodiment: the inner cavity of the respirator 704 is filled with water-absorbing silica gel, and the inner cavity of the inner cylinder 705 is communicated with the inner cavity of the respirator 704.

[0050] In the above structure, by filling the water-absorbing silica gel in the inner cavity of the respirator 704, after the external air enters the inner cavity of the outer cylinder 706 through the air hole 707, it can enter the inner cavity of the respirator 704 through the inner cylinder 705, at this time the water-absorbing silica gel in the inner cavity of the respirator 704 can absorb the water in the air, thereby avoiding the water in the air entering the insulating oil and causing the insulating oil to deteriorate.

[0051] In a preferred embodiment: the number of the limiting rod 708 is two, and the two limiting rods 708 are respectively installed on the two sides of the outer wall of the outer cylinder 706, and the cleaning plate 7011 is made of natural rubber.

[0052] In the above structure, by arranging the limiting rod 708 on the two sides of the outer wall of the outer cylinder 706, the movement of the lifting ring 709 can be limited under the action of the limiting rod 708, so that the lifting ring 709 can only move forward and backward along the outer wall of the limiting rod 708, thereby better enabling the cleaning plate 7011 to move downward along the inner wall of the air hole 707 to clean the inner wall of the air hole 707.

[0053] The working principle is that during use, when the box 1 is normally used, the temperature and pressure in the box 1 are within the normal range, at this time, the driving spring 307 will act on the outer wall of the moving plate 305 under the action of the driving spring 307, so that the moving plate 305 has a tendency to move downward along the outer wall of the fixed rod 304, so that the outer wall of the pressure plate 306 is in the inner cavity of the moving groove 303, and the inner cavity of the moving groove 303 is blocked, so that the inner cavity of the box 1 is in a state of isolation from the external environment. Once the inner cavity of the box 1 appears dangerous, the pressure and temperature in the inner cavity will surge, because the inner cavity of the box 1 is communicated with the inner cavity of the pressure relief pipe 301, at this time, the pressure plate 306 is pushed upward along the inner wall of the moving groove 303 under the action of the pressure, when the outer wall of the pressure plate 306 exceeds the outer wall of the oil discharge pipe 3012, at this time, because the inner cavities of the pressure relief pipe 301 and the oil discharge pipe 3012 are communicated, the insulating oil in the inner cavity of the box 1 can be released to the outside through the oil discharge pipe 3012 in the first time, avoiding explosion caused by excessive pressure in the inner cavity of the box 1, and when installing the pressure relief pipe 301, the maximum pressure borne by the pressure plate 306 can be adjusted according to the size of the inner cavity of the box 1, by rotating the adjusting nut 3010, the push plate 309 and the lower plate 308 are driven under the action of the adjusting nut 3010, so as to move downward along the inner cavity of the pressure relief pipe 301, so as to adjust the stroke of the driving spring 307, so as to adjust the pressure borne by the pressure plate 306, and when the breather 704 is normally used, there is some insulating oil in the inner cavity of the outer cylinder 706, with the continuous air intake and air exhaust, the insulating oil will splash, so that the inner wall of the air hole 707 will also be attached with oil, after contacting with air, a large amount of dust in the air will be attached to the inner wall of the air hole 707, so that the inner cavity of the air hole 707 is blocked, by starting the driving motor 7013, the driving screw 7014 is driven to rotate under the action of the driving motor 7013, in the process of rotating the driving screw 7014, the lifting frame 7012 is driven to move downward along the outer wall of the limiting rod 708, so that the cleaning plate 7011 moves downward from the inner wall of the air hole 707, and the stains attached to the inner wall of the air hole 707 are scraped downward, so as to dredge the inner cavity of the air hole 707, so as to ensure normal air intake and air exhaust, and ensure normal use of the breather 704.

[0054] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0055] While the embodiments of the application have been shown and described herein, it is to be understood that the application is not limited to these embodiments. Rather, numerous modifications are possible without departing from the spirit and scope of the present application as delineated by the claims and their equivalents.

Claims

1. A safety power transformer, comprising a housing (1), characterized in that: The outer wall of the box (1) is fixedly fitted with a heat dissipation plate (2), the top of the box (1) is provided with a pressure relief assembly (3), the top of the box (1) is fixedly fitted with a contact post (4), the outer wall of the contact post (4) is installed with a wire (5), the top of the pressure relief assembly (3) is provided with a push-pull assembly (6), the top of the box (1) is provided with an oil drain assembly (7), the outer wall of the box (1) is provided with a connection hole (8), and the bottom of the box (1) is installed with a support base (9). The pressure relief assembly (3) includes a pressure relief pipe (301), the inner cavity of which is provided with a fixed groove (302) and a movable groove (303). A fixed rod (304) is fixedly mounted on the inner wall of the fixed groove (302), and a movable plate (305) is movably sleeved on the outer wall of the fixed rod (304). A pressure plate (306) is fixedly mounted on the outer wall of the movable plate (305). A drive spring (307) is movably sleeved on the outer wall of the fixed rod (304), a lower pressure plate (308) is movably sleeved on the outer wall of the fixed rod (304), a push plate (309) is fixedly mounted on the outer wall of the lower pressure plate (308), an adjusting nut (3010) is threadedly connected to the outer wall of the fixed rod (304), a fixed cylinder (3011) is installed on the top of the pressure relief pipe (301), and an oil drain pipe (3012) is fixedly mounted on the outer wall of the pressure relief pipe (301). The inner diameter of the fixed groove (302) is larger than the inner diameter of the moving groove (303). The two ends of the outer wall of the driving spring (307) are in contact with the outer walls of the moving plate (305) and the lower pressure plate (308) respectively. The driving spring (307) is made of high carbon steel. The outer wall of the push plate (309) passes through the inner cavity of the pressure relief pipe (301) and is connected to the outer wall of the lower pressure plate (308). The inner cavity of the oil drain pipe (3012) is connected to the inner cavity of the fixed groove (302). The inner cavity of the pressure relief pipe (301) is connected to the inner cavity of the box (1). The push-pull assembly (6) includes a top rod (601), an mounting plate (602) is fixedly mounted on the outer wall of the top rod (601), a lifting plate (603) is mounted on the outer wall of the mounting plate (602), and a fixing hole (604) is opened on the outer wall of the lifting plate (603). The oil drain assembly (7) includes a mounting bracket (701), an oil reservoir (702) is fixedly mounted on the outer wall of the mounting bracket (701), a connecting pipe (703) is mounted on the outer wall of the oil reservoir (702), a breather (704) is mounted on the outer wall of the connecting pipe (703), an inner cylinder (705) is fixedly mounted on the bottom of the breather (704), an outer cylinder (706) is mounted on the bottom of the breather (704), a vent hole (707) is provided on the outer wall of the outer cylinder (706), and the outer wall of the outer cylinder (706) is fixedly mounted with... A limiting rod (708) is provided, and a lifting ring (709) is movably sleeved on the outer wall of the limiting rod (708). A connecting rod (7010) is fixedly mounted on the outer wall of the lifting ring (709). A cleaning plate (7011) is fixedly mounted on the outer wall of the connecting rod (7010). A lifting frame (7012) is fixedly mounted on the outer wall of the lifting ring (709). A drive motor (7013) is fixedly mounted on the outer wall of the lifting frame (7012). A drive screw (7014) is fixedly mounted on the power output shaft of the drive motor (7013).

2. A safe power transformer according to claim 1, characterized in that: The outer wall of the top rod (601) passes through the inner cavity of the fixed cylinder (3011) and is connected to the outer wall of the moving plate (305). The outer wall diameter of the top rod (601) is equal to the inner wall diameter of the fixed cylinder (3011). The inner wall diameter of the fixing hole (604) is equal to the outer wall diameter of the wire (5). The inner wall of the fixing hole (604) is connected to the outer wall of the wire (5).

3. A safe power transformer according to claim 2, characterized in that: The inner diameter of the vent (707) is equal to the outer diameter of the cleaning plate (7011), the outer diameter of the connecting rod (7010) is smaller than the inner diameter of the vent (707), and the outer wall of the drive screw (7014) is threadedly connected to the inner wall of the lifting frame (7012).

4. A safe power transformer according to claim 3, characterized in that: The inner cavity of the connecting pipe (703) is connected to the inner cavity of the oil pillow (702), the inner cavity of the oil pillow (702) is connected to the inner cavity of the box (1), and the outer wall length of the connecting rod (7010) is greater than the inner cavity depth of the vent hole (707).

5. A safe power transformer according to claim 4, characterized in that: The inner cavity of the respirator (704) is filled with absorbent silica gel, and the inner cavity of the inner cylinder (705) is connected to the inner cavity of the respirator (704).

6. A safe power transformer according to claim 4, characterized in that: There are two limiting rods (708), and the two limiting rods (708) are respectively installed on both sides of the outer wall of the outer cylinder (706). The cleaning plate (7011) is made of natural rubber.

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