Distribution transformer with intelligent early warning function

Abstract

The invention relates to the technical field of transformers, in particular to a distribution transformer with an intelligent early warning function, which comprises a transformer chamber and a transformer body located in the transformer chamber, a fire detector and a controller are arranged in the transformer chamber, and a ventilation cooling fan and an alarm are arranged on the side wall of the transformer chamber. The signal output end of the temperature sensor and the signal output end of the fire detector are both connected with the controller, and the signal output end of the controller is connected with the ventilation cooling fan and the alarm. The detachable cover plate is arranged on the side wall of the transformer body, a fire extinguishing agent can be sprayed into the transformer body through separation of the cover plate and the transformer body, and therefore the situation that fire disasters or explosions happen to the interior of the transformer body due to high temperature is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a distribution transformer with an intelligent early warning function. Background Art

[0002] As a critical node in the power transmission network, distribution transformers are constantly exposed to complex environments and face multiple risks during operation, including extreme weather, aging equipment, and human error. In recent years, transformer fires and explosions caused by unexpected factors, such as short circuits and insulation failures, have occurred frequently. These accidents not only directly threaten the safe and stable operation of the power grid but can also cause widespread power outages, posing a serious threat to public safety and socioeconomic order.

[0003] Currently, common causes of transformer fires or explosions include winding shorts or insulation damage. For example, when a coil winding shorts, the current in the circuit suddenly changes. Due to the sudden interruption of the current path, the current will attempt to find another path to form a loop. This can cause an arc near the short circuit point, which can instantly ionize the surrounding air, forming a high-temperature plasma. Furthermore, when the winding shorts, the contact resistance at the fault point increases significantly, and the passage of current generates a significant amount of heat in these poorly connected areas. Furthermore, as the transformer ages, the insulation material within the coil windings also ages to a certain extent. This aging reduces the insulation performance of the insulation material, potentially causing the coil to short circuit. This, in turn, generates a significant amount of heat when current passes through the coil, leading to safety hazards.

[0004] To prevent transformer failures caused by high temperatures, the prior art, Chinese Patent Publication No. CN113990617B, proposes a transformer with an early warning function. The transformer comprises a housing, a transformer body, an oil pipe, and a water tank. The oil pipe draws insulating oil from the transformer body into the water tank, where it is cooled. The cooled oil is then re-introduced into the transformer body, thereby lowering the internal temperature of the transformer body.

[0005] However, while this patented solution can cool the insulating oil inside the transformer, when a short circuit or open circuit occurs, a large amount of heat rapidly accumulates inside the transformer. The water tank alone cannot prevent the transformer from continuing to heat up. When the heat accumulates to a certain level, it can still cause fires or explosions. Therefore, we have proposed a distribution transformer with intelligent early warning capabilities to effectively address these drawbacks. Summary of the Invention

[0006] The object of the present invention is to provide a distribution transformer with an intelligent early warning function, so as to solve the problems raised in the above background technology.

[0007] The present invention is achieved through the following technical solutions:

[0008] A distribution transformer with an intelligent early warning function includes a transformer chamber and a transformer body located inside the transformer chamber. A fire detector and a controller are provided inside the transformer chamber. A ventilation and cooling fan and an alarm are provided on the side walls of the transformer chamber. The signal output ends of the temperature sensor and the fire detector are connected to the controller, and the signal output end of the controller is connected to the ventilation and cooling fan and the alarm.

[0009] A hollow opening is provided on the side wall of the transformer body, a temperature sensor is provided inside the transformer body, a cover plate is sealed and embedded inside the hollow opening, a signal output end of the temperature sensor is connected to a controller, and a drive component for controlling the movement of the cover plate is provided inside the transformer chamber so that the cover plate is embedded in or out of the hollow opening;

[0010] The outer surface of the cover plate is also provided with a fire extinguishing channel mechanism, and a fire extinguisher is provided inside the transformer chamber, and the output end of the fire extinguisher is connected to the input end of the fire extinguishing channel mechanism; when the cover plate is detached from the hollow opening, the output end of the fire extinguishing channel mechanism can extend into the interior of the transformer body.

[0011] Optionally, the driving assembly includes a sealing cylinder and a connecting piece, the cylinder body of the sealing cylinder is fixedly mounted on the inner wall of the transformer chamber, the movable end of the sealing cylinder is connected to the connecting piece, and the connecting piece is fixedly connected to the cover plate.

[0012] Optionally, a plurality of positioning posts are provided on the outer surface of the transformer body and outside the hollow opening, positioning holes corresponding to the positioning posts are opened on the cover plate, and a sealing ring for embedding into the inner side of the hollow opening is further provided on the inner surface of the cover plate.

[0013] Optionally, the cover plate is in a U-shaped structure, and a plurality of fire extinguishing holes for the fire extinguishing channel mechanism to extend into are provided on both the left and right sides of the cover plate.

[0014] Optionally, the fire extinguishing channel mechanism includes a sealing box fixedly arranged on the outer surface of the fire extinguishing hole, the sealing box is an internal hollow structure, a connecting hole aligned with the fire extinguishing hole is opened through the sealing box, and a sealing block is movably provided inside the sealing box, and the sealing block is used to seal the connecting hole.

[0015] Optionally, the fire extinguishing channel mechanism further includes two linear drive structures, which are respectively arranged on the left and right sides of the cover plate, and the two linear drive structures are distributed vertically, and the movable ends of the linear drive structures are provided with drive rods;

[0016] Several sealing blocks located on the same side of the cover plate are all fixedly connected to the driving rod.

[0017] Optionally, the fire extinguishing channel mechanism also includes a fire extinguishing pipe assembly corresponding one-to-one to the sealing box, one end of the fire extinguishing pipe assembly is connected to the connecting hole, one end of several fire extinguishing pipe assemblies located on the same side of the cover plate is commonly connected to a feeding pipe, and the two feeding pipes are commonly connected to a delivery pipe, and one end of the delivery pipe is connected to the output end of the fire extinguisher.

[0018] Optionally, the fire extinguishing pipe assembly includes a first sleeve, a second sleeve and a telescopic tube. The first sleeve is fixedly arranged on the outer surface of the sealing box and is communicated with the connecting hole. The second sleeve is fixedly arranged on the outer surface of the feeding pipe and is communicated with the feeding pipe. A telescopic groove is also provided in the tube wall of the second sleeve. One end of the telescopic tube is located in the telescopic groove, and the other end of the telescopic tube extends into the first sleeve.

[0019] Optionally, a push spring is abutted between the inner end of the telescopic slot and the telescopic tube, and a wire threading hole communicating with the telescopic slot is provided on the tube wall of the second sleeve. A traction wire is provided in the wire threading hole, and the two ends of the traction wire are respectively connected to the inner end of the telescopic tube and the first sleeve; and in a natural state, the push spring is in a compressed state, and the traction wire is in a taut state.

[0020] Optionally, the output end of the fire extinguisher is provided with a solenoid valve, and the signal output end of the controller is also connected to the solenoid valve.

[0021] Compared with the prior art, the present invention provides a distribution transformer with intelligent early warning function, which has the following beneficial effects:

[0022] 1. The transformer body of the present invention has a detachable cover on its side wall. By detaching the cover from the transformer body, a fire extinguishing agent can be sprayed into the interior of the transformer body, thereby preventing fire or explosion caused by high temperature inside the transformer body.

[0023] 2. The fire extinguisher of the present invention can be extended into the interior of the transformer body through the fire extinguishing channel mechanism, so that the fire extinguishing agent can be sprayed more directly onto the coil windings and transformer core, thereby helping to eliminate the fire source at the root and fully improving the fire extinguishing and cooling efficiency;

[0024] 3. The fire extinguishing passage mechanism of the present invention is provided on the cover plate, and when the cover plate is closed on the inner side of the hollow opening of the side wall of the transformer body, the fire extinguishing passage mechanism and the interior of the transformer body can be kept isolated, thereby preventing the insulating oil inside the transformer body from overflowing from the fire extinguishing passage mechanism;

[0025] 4. The present invention has a temperature sensor, a fire detector, a controller and an alarm. When the temperature sensor detects an abnormal insulating oil temperature, or the fire detector detects that the transformer starts to smoke, the controller can respond immediately, thereby triggering the alarm, thereby helping to improve the safety factor of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the fire extinguishing channel mechanism of the present invention;

[0028] Figure 3 This is a cross-sectional view of the fire extinguishing channel mechanism of the present invention;

[0029] Figure 4 This is a schematic diagram of the linear drive structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the telescopic tube structure of the present invention;

[0031] Figure 6 A partial cross-sectional view of the telescopic tube structure of the present invention;

[0032] Figure 7 for Figure 3 The corresponding figure at A is enlarged;

[0033] Figure 8 for Figure 3 The corresponding figure at point B is enlarged.

[0034] In the figure: 100, transformer room; 101, temperature sensor; 102, fire detector; 103, controller; 104, ventilation and cooling fan; 105, alarm; 200, transformer body; 201, hollow opening; 202, cover plate; 203, positioning column; 204, fire extinguishing hole; 300, drive assembly; 301, sealing cylinder; 302, connecting piece; 400, fire extinguishing channel mechanism; 401, sealing box; 402, connecting hole; 403, sealing block; 404, linear drive structure; 405, driving rod; 406, fire extinguishing pipe assembly; 4061, first sleeve; 4062, second sleeve; 4063, telescopic tube; 4064, telescopic slot; 4065, push spring; 407, feed pipe; 408, delivery pipe; 409, traction line; 410, inclined hole; 500, fire extinguisher. DETAILED DESCRIPTION

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figure 1 - Figure 8 , a distribution transformer with an intelligent early warning function, including a transformer chamber 100 and a transformer body 200 located inside the transformer chamber 100. A fire detector 102 (model: JTW-LD-XD300CP) and a controller 103 are provided inside the transformer chamber 100. A ventilation and heat dissipation fan 104 and an alarm 105 are provided on the side wall of the transformer chamber 100. The alarm 105 can be a buzzer. The signal output end of the fire detector 102 is connected to the controller 103. The model of the controller 103 is JB-QB-TF200. The signal output end of the controller 103 is connected to the ventilation and heat dissipation fan 104 and the alarm 105. The ventilation and heat dissipation fan 104 automatically turns on, which helps to cool down the inside of the transformer chamber 100.

[0037] In addition, when a fire occurs in the transformer body 200, the fire detector 102 can immediately transmit a signal to the controller 103, and the controller 103 then activates the alarm 105, thereby reminding the surrounding pedestrians to stay away from the transformer and avoiding unnecessary dangers.

[0038] Furthermore, a hollow opening 201 is formed on the side wall of the transformer body 200. A temperature sensor 101 (model: ARTM-8L) is also provided inside the transformer body 200. The signal output end of the temperature sensor 101 is connected to the controller 103. A cover plate 202 is hermetically embedded inside the hollow opening 201. A driving component 300 for controlling the movement of the cover plate 202 is also provided inside the transformer chamber 100, so that the cover plate 202 can be embedded in or separated from the hollow opening 201. The hollow opening 201 is in a U shape, and the cover plate 202 is also in a U-shaped structure. Moreover, a plurality of positioning columns 203 are provided on the outer surface of the transformer body 200 and outside the hollow opening 201. Positioning holes corresponding to the positioning columns 203 one by one are formed on the cover plate 202, and a sealing ring for embedding inside the inner side of the hollow opening 201 is also provided on the inner surface of the cover plate 202. Therefore, when the cover plate 202 is tightly embedded inside the inner side of the hollow opening 201, the relative sealing inside the transformer body 200 can be ensured, preventing foreign objects from entering the transformer, and also preventing the insulating oil inside the transformer body 200 from flowing out.

[0039] It should be noted that temperature sensor 101 is used to monitor the temperature of the insulating oil within transformer body 200 in real time. When the insulating oil temperature exceeds a normal range, or when fire detector 102 detects smoke from the top terminal of transformer body 200, these are considered fire signals, facilitating a timely response from controller 103. It is worth noting that the normal temperature of the insulating oil within a transformer generally does not exceed 85 degrees Celsius. Specifically, in this embodiment, a fire signal is considered when the insulating oil temperature exceeds 105 degrees Celsius.

[0040] Specifically, the drive assembly 300 includes a sealing cylinder 301 and a connector 302. The cylinder body of the sealing cylinder 301 is fixedly mounted on the inner wall of the transformer chamber 100. The movable end of the sealing cylinder 301 is connected to the connector 302, which is fixedly connected to the cover plate 202. The axial direction of the sealing cylinder 301 is perpendicular to the side wall of the transformer body 200. Therefore, when the sealing cylinder 301 is actuated, it can control the front and back sliding of the cover plate 202, thereby allowing the cover plate 202 to be inserted into or removed from the hollow opening 201.

[0041] In addition, the outer surface of the cover plate 202 is provided with a fire extinguishing passage mechanism 400. A fire extinguisher 500 is located within the transformer chamber 100, and the output of the fire extinguisher 500 is connected to the input of the fire extinguishing passage mechanism 400. When the cover plate 202 is removed from the hollow opening 201, the output of the fire extinguishing passage mechanism 400 can extend into the interior of the transformer body 200. It should be noted that the output of the fire extinguisher 500 is provided with a solenoid valve, and the signal output of the controller 103 is also connected to the solenoid valve. When the solenoid valve is opened and the cover plate 202 is removed from the hollow opening 201, the fire extinguishing agent can enter the interior of the transformer body 200 through the fire extinguishing passage mechanism 400.

[0042] The specific structure of the fire extinguishing passage mechanism 400 is described below:

[0043] The left and right sides of the cover plate 202 are each provided with a plurality of fire extinguishing holes 204 through which the fire extinguishing passage mechanism 400 extends. The fire extinguishing passage mechanism 400 comprises a sealing box 401 fixedly mounted on the outer surface of the fire extinguishing hole 204. The sealing box 401 is a hollow structure with a connecting hole 402 extending therethrough, aligned with the fire extinguishing hole 204. A sealing block 403 is movably mounted within the sealing box 401 to seal the connecting hole 402. Furthermore, the outer surface of the sealing block 403 is provided with a sealing layer. When the sealing block 403 is located inside the connecting hole 402, the fire extinguishing hole 204 is sealed from the outside world.

[0044] Furthermore, the fire extinguishing passage mechanism 400 also includes two linear drive structures 404, one on each side of the cover plate 202. Both linear drive structures 404 are vertically distributed, and the movable ends of the linear drive structures 404 are equipped with drive rods 405. Several sealing blocks 403 located on the same side of the cover plate 202 are fixedly connected to the drive rods 405. Specifically, the linear drive structures 404 utilize linear slides, and the top ends of the sealing blocks 403 are each equipped with a push rod. The top end of the push rod movably penetrates the top wall of the sealing box 401 and is connected to the drive rod 405. Therefore, the linear drive structures 404 can directly drive the sealing blocks 403 to rise and fall, thereby controlling the opening and closing of the fire extinguishing holes 204.

[0045] In addition, the fire extinguishing channel mechanism 400 also includes fire extinguishing pipe assemblies 406, each corresponding to the sealing box 401. One end of each fire extinguishing pipe assembly 406 is connected to the communication hole 402. A feed pipe 407 is commonly connected to one end of each of the fire extinguishing pipe assemblies 406 on the same side of the cover plate 202. Two feed pipes 407 are commonly connected to a delivery pipe 408, one end of which is connected to the output end of the fire extinguisher 500. Therefore, when the solenoid valve at the output end of the fire extinguisher 500 is opened, the fire extinguishing agent can enter the interior of the transformer body 200 through the delivery pipe 408, the feed pipe 407, the fire extinguishing pipe assembly 406, and the fire extinguishing hole 204.

[0046] In some embodiments of the present application, the fire extinguishing tube assembly 406 includes a first sleeve 4061, a second sleeve 4062, and a telescopic tube 4063. The first sleeve 4061 is fixedly mounted on the outer surface of the sealing box 401 and communicates with the communicating hole 402. The second sleeve 4062 is fixedly mounted on the outer surface of the feeding tube 407 and communicates with the feeding tube 407. The second sleeve 4062 further has a telescopic groove 4064 defined within its wall. One end of the telescopic tube 4063 is positioned within the telescopic groove 4064, while the other end of the telescopic tube 4063 extends into the first sleeve 4061. One end of the telescopic tube 4063 is in sealing contact with the inner surface of the first sleeve 4061, while the other end of the telescopic tube 4063 is in sealing contact with the inner surface of the telescopic groove 4064, thereby preventing leakage of the fire extinguishing agent.

[0047] A push spring 4065 abuts the inner end of the telescopic slot 4064 and the telescopic tube 4063. A threading hole communicating with the telescopic slot 4064 is formed in the wall of the second sleeve 4062. A traction wire 409 is disposed within the threading hole. The ends of the traction wire 409 are connected to the inner end of the telescopic tube 4063 and the first sleeve 4061, respectively. In a natural state, the push spring 4065 is compressed, and the traction wire 409 is taut. Therefore, the push spring 4065 constantly pushes the telescopic tube 4063 toward the first sleeve 4061, keeping the traction wire 409 stretched.

[0048] Specifically in this embodiment, when the cover plate 202 moves away from the transformer body 200 , the distance between the first sleeve 4061 and the second sleeve 4062 gradually decreases, so the telescopic tube 4063 can move toward the side close to the transformer body 200 under the action of the push spring 4065 .

[0049] In this embodiment, the cover plate 202 and the fire extinguishing pipe assembly 406 are designed as a linkage mechanism, wherein the forward and backward movement of the cover plate 202 can indirectly drive the extension and retraction of the telescopic tube 4063, thereby helping the telescopic tube 4063 to respond promptly to the movement of the cover plate 202; at the same time, the cover plate 202 can also provide support for the fire extinguishing pipe assembly 406, so that the fire extinguishing pipe assembly 406 remains stable while spraying the fire extinguishing agent.

[0050] It is worth mentioning that the front end outer peripheral wall of the telescopic tube 4063 has an inclined hole 410, such as Figure 6 As shown; since the telescopic tube 4063 is located at the inner edge of the transformer body 200 after extending into the transformer body 200, in order to better extinguish the fire of the iron core and winding inside the transformer, this embodiment provides an inclined hole 410 on the front end side of the telescopic tube 4063, and the inclined hole 410 is aligned with the middle position inside the transformer body 200 so that the fire extinguishing agent can be fully utilized.

[0051] In actual use of this embodiment, when the temperature sensor 101 or the fire detector 102 detects a fire signal, the controller 103 immediately controls the drive assembly 300 to disengage the cover plate 202 from the hollow opening 201. Simultaneously, the controller 103 also controls the two linear drive structures 404 to move the sealing block 403 upward, thereby unblocking the fire extinguishing hole 204 and the connecting hole 402. As the cover plate 202 retreats, insulating oil leaks directly from the hollow opening 201. Under the action of the push spring 4065, the front end of the telescopic tube 4063 is able to pass through the connecting hole 402 and the fire extinguishing hole 204 and enter the interior of the transformer body 200. Finally, the solenoid valve at the output end of the fire extinguisher 500 is opened, allowing the fire extinguishing agent to pass through the delivery pipe 408, the feed pipe 407, and the telescopic tube 4063 in sequence and enter the interior of the transformer body 200, thereby extinguishing the windings, core, and insulation materials within the transformer body 200 and preventing fire or explosion caused by high temperatures.

[0052] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A distribution transformer with intelligent early warning function, comprising a transformer chamber and a transformer body located inside the transformer chamber, characterized in that: A fire detector and a controller are provided inside the transformer chamber, a ventilation and cooling fan and an alarm are provided on the side wall of the transformer chamber, the signal output ends of the temperature sensor and the fire detector are connected to the controller, and the signal output end of the controller is connected to the ventilation and cooling fan and the alarm; A hollow opening is provided on the side wall of the transformer body, a temperature sensor is provided inside the transformer body, a cover plate is sealed and embedded inside the hollow opening, a signal output end of the temperature sensor is connected to a controller, and a drive component for controlling the movement of the cover plate is provided inside the transformer chamber so that the cover plate is embedded in or out of the hollow opening; The outer surface of the cover plate is also provided with a fire extinguishing channel mechanism, and a fire extinguisher is provided inside the transformer chamber, and the output end of the fire extinguisher is connected to the input end of the fire extinguishing channel mechanism; when the cover plate is detached from the hollow opening, the output end of the fire extinguishing channel mechanism can extend into the interior of the transformer body.

2. The distribution transformer with intelligent early warning function according to claim 1, characterized in that: The driving assembly includes a sealing cylinder and a connecting piece. The cylinder body of the sealing cylinder is fixedly mounted on the inner wall of the transformer chamber. The movable end of the sealing cylinder is connected to the connecting piece, and the connecting piece is fixedly connected to the cover plate.

3. The distribution transformer with intelligent early warning function according to claim 1, characterized in that: The outer surface of the transformer body is provided with a plurality of positioning posts outside the hollow opening. The cover plate is provided with positioning holes corresponding to the positioning posts one by one. The inner surface of the cover plate is also provided with a sealing ring for embedding inside the hollow opening.

4. The distribution transformer with intelligent early warning function according to claim 1, characterized in that: The cover plate is in a U-shaped structure, and a plurality of fire extinguishing holes for the fire extinguishing channel mechanism to extend into are opened on both the left and right sides of the cover plate.

5. The distribution transformer with intelligent early warning function according to claim 4, characterized in that: The fire extinguishing channel mechanism includes a sealing box fixedly arranged on the outer surface of the fire extinguishing hole. The sealing box is an internal hollow structure. A connecting hole aligned with the fire extinguishing hole is opened through the sealing box. A sealing block is movably provided inside the sealing box. The sealing block is used to seal the connecting hole.

6. The distribution transformer with intelligent early warning function according to claim 5, characterized in that: The fire extinguishing channel mechanism further includes two linear drive structures, which are respectively arranged on the left and right sides of the cover plate, and the two linear drive structures are distributed vertically, and the movable ends of the linear drive structures are provided with drive rods; Several sealing blocks located on the same side of the cover plate are all fixedly connected to the driving rod.

7. The distribution transformer with intelligent early warning function according to claim 6, characterized in that: The fire extinguishing channel mechanism also includes a fire extinguishing pipe assembly corresponding one to one with the sealing box, one end of the fire extinguishing pipe assembly is connected to the communicating hole, one end of several fire extinguishing pipe assemblies located on the same side of the cover plate is commonly connected to a feeding pipe, and the two feeding pipes are commonly connected to a delivery pipe, one end of the delivery pipe is connected to the output end of the fire extinguisher.

8. The distribution transformer with intelligent early warning function according to claim 7, characterized in that: The fire extinguishing pipe assembly includes a first sleeve, a second sleeve and a telescopic pipe. The first sleeve is fixedly arranged on the outer surface of the sealing box and is communicated with the connecting hole. The second sleeve is fixedly arranged on the outer surface of the feeding pipe and is communicated with the feeding pipe. A telescopic groove is also opened in the tube wall of the second sleeve. One end of the telescopic pipe is located in the telescopic groove, and the other end of the telescopic pipe extends into the first sleeve.

9. The distribution transformer with intelligent early warning function according to claim 8, characterized in that: A push spring is abutted between the inner end of the telescopic slot and the telescopic tube. A threading hole communicating with the telescopic slot is provided on the wall of the second sleeve. A traction line is provided in the threading hole. The two ends of the traction line are respectively connected to the inner end of the telescopic tube and the first sleeve. In a natural state, the push spring is in a compressed state and the traction line is in a taut state.

10. The distribution transformer with intelligent early warning function according to claim 1, characterized in that: The output end of the fire extinguisher is provided with a solenoid valve, and the signal output end of the controller is also connected to the solenoid valve.

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