Oil-immersed transformer

Abstract

The invention provides an oil-immersed transformer. When explosion venting accidents happen to the oil-immersed transformer, liquid carbon dioxide in the liquid carbon dioxide container can be sprayed into the oil tank through the liquid pumping pipe and the spraying pipe, a fire source is effectively extinguished, oxygen supply is restrained, and a combustion chain of a fire disaster is blocked; and the liquid carbon dioxide is a good electric insulator, so that the electric shock risk in the fire extinguishing process can be reduced. Meanwhile, a pressure relief device of the oil-immersed transformer can be rapidly opened, pressure in the oil tank is rapidly released, and explosion hazards are reduced. The flue gas treatment device can treat explosion gas discharged by the pressure relief device, harmful substances are converted into harmless substances, and the harmless substances are discharged to a safe area, so that the safety of the surrounding environment and equipment is protected, and the pollution to the environment and the injury to personnel are reduced. That is, according to the oil-immersed transformer disclosed by the invention, the liquid carbon dioxide fire extinguishing design, explosion venting and smoke treatment design are introduced, so that the safety of explosion venting accidents of the oil-immersed transformer and the fire extinguishing effect are improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of transformers, in particular to an oil-immersed transformer. BACKGROUND

[0002] An oil-immersed transformer is a transformer that uses an oil-based liquid as a sealing and heat-conducting medium. Compared with a dry-type transformer, the oil-immersed transformer has low cost, and due to the protective effect of transformer oil, the heat generated in the oil-immersed transformer is not easy to accumulate, which facilitates heat dissipation of the transformer, and the working structure such as a coil inside the transformer is also not easy to oxidize during work, and the use cost is also much lower than that of the dry-type transformer.

[0003] The oil-immersed transformer plays a crucial role in the power system. Most power transformers use transformer oil as an insulating and cooling medium, but the transformer oil used by the oil-immersed transformer has the possibility of burning. At present, when the oil-immersed transformer catches fire, it is basically only extinguished by fire fighters, and it is difficult to extinguish due to the presence of a large amount of transformer oil, which may cause serious fire and explosion, posing a threat to personnel safety and stable operation of equipment.

[0004] Traditional fire extinguishing systems commonly use water, foam and other media, but in the case of an oil-immersed transformer explosion, the extinguishing effect of these media is limited due to the presence of an oil film. SUMMARY

[0005] In view of this, in order to solve the technical problem of poor fire extinguishing effect of the oil-immersed transformer in the prior art, the present disclosure provides an oil-immersed transformer.

[0006] According to a first aspect of an embodiment of the present disclosure, an oil-immersed transformer is provided, which comprises a transformer body, a liquid carbon dioxide container and a flue gas processor.

[0007] The transformer body comprises an oil tank, the oil tank is provided with transformer oil, the top of the oil tank is open and provided with a detachable sealing cover, and at least one pressure relief device is arranged on the sealing cover.

[0008] The liquid carbon dioxide container is communicated with the injection pipe through the liquid suction pipe, the injection pipe is arranged at the upper part inside the oil tank and used for injecting liquid carbon dioxide into the oil tank, and the liquid suction pipe is provided with a first electromagnetic valve and a liquid suction pump.

[0009] The smoke treatment device is communicated with the pressure relief port of the pressure reliever through a smoke extraction pipe, and comprises a treatment box and a filter located in the treatment box.

[0010] In an alternative embodiment, the top of the filter cartridge is provided with a retaining edge which is clamped on the side of the upper support plate facing the first interval; the bottom of the filter cartridge is provided with an extended neck which is inserted into the lower support plate; the filter cartridge comprises a cartridge body, the inside of the cartridge body is provided with a plurality of detachable filter plates, the plurality of filter plates are arranged along the axial direction of the filter cartridge, and a filler for filtering smoke is arranged between adjacent filter plates.

[0011] In an alternative embodiment, the extended neck is provided with external threads, the lower support plate is provided with a threaded insertion hole, and the extended neck and the lower support plate are threadedly connected through the external threads and the internal threads.

[0012] In an alternative embodiment, the inner side wall of the cartridge body is provided with an insertion slot extending along the axial direction of the filter cartridge, the side wall of the filter plate is provided with a protruding portion matched with the insertion slot, and the filter plate is detachably connected with the cartridge body by clamping the protruding portion into the insertion slot.

[0013] In an alternative embodiment, the oil tank is provided with a temperature sensor and a pressure sensor, and the temperature sensor and the pressure sensor are electrically connected with the first electromagnetic valve on the liquid extraction pipe.

[0014] In the case where the temperature value detected by the temperature sensor is greater than or equal to a set temperature threshold value, and / or the pressure value detected by the pressure sensor is greater than or equal to a set pressure threshold value, the first electromagnetic valve is in an open state.

[0015] In an alternative embodiment, the oil-immersed transformer comprises an oil tank, the oil tank is communicated with the bottom of the oil tank through a return oil pipe, the return oil pipe is provided with a second electromagnetic valve, an oil extraction pump and a cooler, and the temperature sensor and the pressure sensor are electrically connected with the second electromagnetic valve on the liquid extraction pipe.

[0016] In the case that the temperature value detected by the temperature sensor is greater than or equal to the set temperature threshold value, and / or the pressure value detected by the pressure sensor is greater than or equal to the set pressure threshold value, the second electromagnetic valve is in an open state.

[0017] In an alternative embodiment, the cooler comprises a cooling jacket, which is sleeved on the outer periphery of the oil return pipe, the upper portion of the cooling jacket is provided with a cooling water inlet, the lower portion of the cooling jacket is provided with a cooling water outlet, and the cooling jacket is used to cool the transformer oil discharged from the oil tank through the oil return pipe by injecting cold water.

[0018] In an alternative embodiment, the upper portion of the inner wall of the oil tank is provided with a support for supporting the injection pipe, the support comprises a support frame and a fixing clamp, the support frame is fixedly connected with the inner wall of the oil tank, and the fixing clamp is fixedly connected with the support frame and used to clamp the injection pipe.

[0019] In an alternative embodiment, the pressure relief device comprises an outer sleeve, an inner sleeve, a baffle and a spring.

[0020] The inner sleeve is fixedly connected with the sealing cover, the bottom of the inner sleeve is in communication with the inside of the oil tank, and the top of the inner sleeve is sealed, the outer sleeve is sleeved on the outside of the inner sleeve, the top of the outer sleeve is provided with a pressure relief port, a connecting neck is arranged at the position of the pressure relief port, and the smoking pipe is connected with the connecting neck to realize the communication between the smoking pipe and the pressure relief port.

[0021] A plurality of slits are arranged on the side wall of the inner sleeve, the inner sleeve is provided with a baffle which is slidable along the axial direction of the inner sleeve, the baffle blocks the communication between the inner sleeve and the oil tank, a spring is further arranged between the top of the baffle and the inner sleeve, the upper surface of the baffle is provided with a first fixing column for fixing the spring, and the top of the inner sleeve is provided with a second fixing column for fixing the spring.

[0022] In an alternative embodiment, the edge of the baffle is provided with guide blocks equal in number to the number of the slits, the slits extend along the axial direction of the inner sleeve, the guide blocks extend into the corresponding slits and are movable along the extension direction of the slits to guide the movement of the baffle.

[0023] The technical scheme provided by the embodiment of the present disclosure can include the following beneficial effects: in the present disclosure, when an oil-immersed transformer has a pressure relief accident, liquid carbon dioxide in the liquid carbon dioxide container is sprayed into the oil tank through the liquid extraction pipe and the spray pipe, and carbon dioxide generated by the evaporation of the liquid carbon dioxide forms an inert atmosphere to suppress the combustion of the fire source. In this way, the liquid carbon dioxide can evaporate rapidly when it contacts a high-temperature object, absorb heat and reduce the temperature of the surrounding environment, effectively extinguishing the fire source; the liquid carbon dioxide can also generate a large amount of carbon dioxide gas after evaporation, which is inert and can effectively inhibit the supply of oxygen, thereby breaking the combustion chain of the fire; the liquid carbon dioxide is also a good electrical insulator, which can reduce the risk of electric shock during the fire extinguishing process. At the same time, the pressure relief device of the oil-immersed transformer can be quickly opened to rapidly release the pressure inside the oil tank, thereby reducing the explosion hazard. The smoke gas processor can process the explosion gas discharged by the pressure relief device, convert the harmful substances into harmless substances, and discharge them to a safe area, thereby protecting the safety of the surrounding environment and equipment, reducing pollution to the environment and harm to personnel. That is, the oil-immersed transformer of the present disclosure improves the safety and fire extinguishing effect of the oil-immersed transformer in a pressure relief accident by introducing the liquid carbon dioxide fire extinguishing design and the pressure relief and smoke gas treatment design.

[0024] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and do not limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the accompanying drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0027] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings, which do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified. The drawings in the drawings do not constitute a proportional limitation.

[0028] Figure 1 is a structural schematic diagram of the oil-immersed transformer of the present disclosure;

[0029] Figure 2 is a front view of the oil-immersed transformer of the present disclosure;

[0030] Figure 3 is a partial sectional view of the oil-immersed transformer of the present disclosure;

[0031] Figure 4 is a partial enlarged view of A of the oil-immersed transformer according to the present application;

[0032] Figure 5 is a structural schematic view of the pressure reliever according to the present application;

[0033] Figure 6 is a structural schematic view of the oil tank according to the present application;

[0034] Figure 7 is a structural schematic view of the support according to the present application;

[0035] Figure 8 is a structural schematic view of the filter according to the present application.

[0036] Reference signs:

[0037] 1, oil tank; 11, heat dissipation pipe; 12, heat dissipation fin; 2, sealing cover; 21, pressure reliever; 211, outer sleeve; 212, connecting neck; 213, inner sleeve; 214, slit; 215, baffle; 2151, guide block; 216, spring; 22, high-pressure sleeve; 23, low-pressure sleeve; 24, oil pillow; 3, protection box; 4, liquid carbon dioxide container; 41, liquid extraction pipe; 42, injection pipe; 43, support; 431, support frame; 432, fixing clamp; 5, oil tank; 51, oil return pipe; 52, oil extraction pump; 53, cooler; 6, flue gas processor; 61, filter; 611, lower support plate; 612, upper support plate; 613, filter cartridge; 6131, baffle; 6132, extension neck; 6133, filter plate; 6134, insertion slot; 6135, filler; 62, flue gas discharge pipe; 63, flue gas extraction pipe. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0039] The following disclosure provides many different embodiments, or examples, for implementing different aspects and / or features of the present application. For purposes of simplicity, the description is broken into sections. Of course, the description is not intended to limit the application. Furthermore, the description is not intended to be bound by the examples provided. Moreover, the application can be practiced with less than all of the features described.

[0040] For the convenience of description, spatial relative terms can be used in the specification to describe the relative position relationship or movement condition of one element or feature with respect to another element or feature as shown in the drawings, such as "inner", "outer", "inboard", "outboard", "under", "below", "on", "above", "front", "back", and the like. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or reversed, or the orientation of the device is changed, the directional indications are also changed accordingly, for example: the element described as "under" or "below" another element or feature will be subsequently oriented as "above" or "above" another element or feature. Therefore, the example term "below" can include both upward and downward orientations. The device can be additionally oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the specification are interpreted accordingly.

[0041] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only show the components related to the present application in the drawings, not drawn according to the number, shape and size of the components in actual implementation. The actual implementation of each component can be a random change, and the component layout pattern can be more complex.

[0042] The embodiments of the present application will be described below with reference to the drawings and preferred embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure in the specification. The present application can also be implemented or applied by other different specific embodiments, and each detail in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustration of the present application, and are not intended to limit the protection scope of the present application.

[0043] In order to solve the technical problem of poor fire extinguishing effect of the oil-immersed transformer in the prior art, the present disclosure provides an oil-immersed transformer.

[0044] In the present disclosure, when an oil-immersed transformer has a blast accident, the liquid carbon dioxide in the liquid carbon dioxide container will be sprayed into the oil tank through the liquid suction pipe and the spray pipe, and the carbon dioxide generated by the evaporation of the liquid carbon dioxide will form an inert atmosphere to suppress the combustion of the fire source. Among them, the liquid carbon dioxide will evaporate rapidly when it comes into contact with a high-temperature object, absorb heat and reduce the temperature around it, effectively extinguishing the fire source; a large amount of carbon dioxide gas generated after the evaporation of the liquid carbon dioxide is inert and can effectively inhibit the supply of oxygen, thereby breaking the combustion chain of the fire; the liquid carbon dioxide is also a good electrical insulator, which can reduce the risk of electric shock during the fire extinguishing process. At the same time, the pressure relief device of the oil-immersed transformer will quickly open to rapidly release the pressure inside the oil tank, reducing the explosion hazard. The smoke gas processor will process the explosion gas discharged by the pressure relief device, convert harmful substances into harmless substances, and discharge them to a safe area, protecting the safety of the surrounding environment and equipment, reducing pollution to the environment and harm to personnel. That is, the oil-immersed transformer of the present disclosure improves the safety and fire extinguishing effect of the oil-immersed transformer in the event of a blast by introducing liquid carbon dioxide fire extinguishing design and blast and smoke gas treatment design.

[0045] In one exemplary embodiment, an oil-immersed transformer is provided. Referring to Figures 1 to 8 As shown, the oil-immersed transformer includes a transformer body, a liquid carbon dioxide container, and a smoke gas processor 6.

[0046] Among them, the transformer body includes an oil tank 1, which is provided with transformer oil for immersing the transformer in the transformer oil. The transformer body can include a core and a winding, both of which are arranged in the oil tank 1. The transformer oil serves as an insulating and cooling medium, and the core is the magnetic circuit part of the transformer body, which generates heat due to hysteresis loss and eddy current loss during operation. To reduce heat loss and reduce volume and weight, the core can be composed of cold-rolled grain-oriented silicon steel sheets with a permeability of less than 0.35 mm, and according to the arrangement of the winding in the core, there are core type and shell type. The winding and the core are the core components of the transformer. Since the winding itself has resistance or contact resistance at the joint, heat will be generated according to Joule's law, so the winding cannot pass through a current higher than the rated current for a long time. In addition, a large electromagnetic force will be generated on the winding when a short-circuit current passes through, which will damage the transformer. The basic winding has two types: concentric and overlapping.

[0047] The transformer body (i.e. winding and core) of the oil-immersed transformer is installed in the oil tank 1 filled with transformer oil, and the oil tank 1 is welded with steel plates. The oil tank 1 of a medium or small transformer is composed of a tank shell and a tank cover, and the transformer body is placed in the tank shell, and the tank cover is opened to lift out the body for maintenance.

[0048] The top of the oil tank 1 is open and provided with a detachable sealing cover 2 (which can serve as the tank cover of the oil tank 1), and at least one pressure relief device 21 is arranged on the sealing cover 2 for timely discharge of smoke gas in the event of an explosion of the transformer. It should be noted that the number of pressure relief devices 21 can be set according to actual needs, and no limitation is made in this regard. Generally, the more the number of pressure relief devices 21, the better the pressure relief effect of the oil-immersed transformer.

[0049] For example, four pressure relief devices 21 can be arranged on the sealing cover 2, which can quickly open when the pressure in the oil tank 1 increases, timely release the pressure inside the oil tank 1, and to a certain extent avoid the explosion caused by the energy storage of oil and gas, even if an explosion occurs, it can reduce the harm of explosion.

[0050] In addition, a high-pressure sleeve 22, a low-pressure sleeve 23 and an oil pillow 24 can also be arranged on the top of the sealing cover 2, and the sealing cover 2 is connected with the tank body through a flange. The high-pressure sleeve 22 and the low-pressure sleeve 23 serve as the connecting components of the transformer winding and the external circuit, which are arranged on the top of the sealing cover 2, can ensure electrical insulation performance while realizing safe transmission of high and low voltage side electric energy. The high-pressure sleeve 22 can withstand high-voltage environment, effectively isolate high-voltage electricity and transformer tank, prevent safety hazards such as electric leakage and flashover; the low-pressure sleeve 23 ensures the stable connection of the low-voltage side circuit, and the cooperation of the two guarantees the reliability and stability of transformer power transmission, reduces the risk of failure caused by electrical connection problems. The arrangement of the oil pillow 24 can effectively adjust the volume change of the transformer oil in the oil tank 1. During the operation of the transformer, the oil temperature will rise and fall with the change of load and environmental temperature, thereby causing the expansion or contraction of the oil volume. The oil pillow 24 can accommodate part of the oil volume change, avoid the oil tank 1 from bearing excessive pressure or appearing in a vacuum state due to the change of oil volume, and protect the structural integrity of the oil tank 1. At the same time, the oil pillow 24 can also reduce the contact area between the transformer oil and the air, reduce the oxidation speed and the risk of moisture of the oil, prolong the service life of the transformer oil, and indirectly improve the overall operation life and reliability of the transformer.

[0051] The liquid carbon dioxide container is communicated with the injection pipe 42 through the liquid suction pipe 41, the injection pipe 42 is arranged at the upper part inside the oil tank 1 and used for injecting liquid carbon dioxide into the oil tank 1, and the liquid suction pipe 41 is provided with a first electromagnetic valve and a liquid suction pump to facilitate the control of the delivery of liquid carbon dioxide.

[0052] When the oil-immersed transformer has a blast accident, the liquid carbon dioxide in the liquid carbon dioxide container 4 can be sprayed into the oil tank 1 through the liquid suction pipe 41 and the spray pipe 42, and the carbon dioxide generated by the evaporation of the liquid carbon dioxide can form an inert atmosphere to suppress the combustion of the fire source. Among them, the liquid carbon dioxide can evaporate rapidly when it contacts a high-temperature object, absorb heat and reduce the temperature around it, effectively extinguishing the fire source; a large amount of carbon dioxide gas generated after the evaporation of the liquid carbon dioxide is inert and can effectively inhibit the supply of oxygen, breaking the combustion chain of the fire; the liquid carbon dioxide is also a good electrical insulator, which can reduce the risk of electric shock during the fire extinguishing process.

[0053] Among them, the upper part of the inner wall of the oil tank 1 is provided with a support 43 for supporting the spray pipe 42, the support 43 includes a support frame 431 and a fixed clamp 432, the support frame 431 is fixedly connected with the inner side wall of the oil tank 1, and the fixed clamp 432 is fixedly connected with the support frame 431, and the fixed clamp 432 is used for clamping the spray pipe 42. For example, the support frame 431 can be made of angle steel and welded to the inner side wall of the oil tank 1 to ensure the reliability of the connection. The fixed clamp 432 can be configured as a circular arc slot to better adapt to the outer diameter of the spray pipe 42 and improve the firmness of the spray pipe 42. The fixed clamp 432 and the support frame 431 can be welded to ensure the reliability of the connection.

[0054] It should be noted that the length of the spray pipe 42 and the arrangement position in the oil tank 1 can be set according to the actual situation, and no limitation is made thereto. For example, the spray pipe 42 can be arranged on one side of the oil tank 1, or can be arranged circumferentially around the oil tank 1. In addition, a plurality of spray holes can be provided on the pipe wall of the spray pipe 42 to facilitate the rapid spraying of liquid carbon dioxide to multiple positions of the oil tank 1, and to better improve the fire extinguishing effect.

[0055] Among them, the smoke treatment device 6 communicates with the pressure relief port of the pressure relief device 21 through a smoke suction pipe 63, and the smoke treatment device 6 includes a treatment box and a filter 61 located in the treatment box, the filter 61 includes an upper support plate 612, a lower support plate 611 and at least one filter cartridge 613 arranged between the upper support plate 612 and the lower support plate 611, the upper support plate 612 has a first interval with the top of the treatment box, the lower support plate 611 has a second interval with the bottom of the treatment box, the gas outlet of the filter cartridge 613 communicates with the first interval, the gas inlet of the filter cartridge 613 communicates with the second interval, the smoke suction pipe 63 communicates with the second interval, and the smoke exhaust pipe 62 of the smoke treatment device 6 communicates with the first interval. The smoke exhaust pipe 62 is arranged on the upper part of the box of the upper support plate 612.

[0056] When the pressure relief device 21 opens, the discharged flue gas will be transported to the flue gas processor 6. The flue gas processor 6 will process the explosion gas discharged by the pressure relief device 21, convert harmful substances into harmless substances, and discharge them to a safe area, protecting the surrounding environment and equipment, reducing environmental pollution and harm to personnel.

[0057] In the oil-immersed transformer of this embodiment, when the transformer main body is normally working, the transformer oil in the oil tank 1 circulates as an insulating and cooling medium. The heat generated by the core and winding is transferred to the oil tank 1 wall through the transformer oil, and then dissipated to the air through the radiator. The liquid carbon dioxide container and the flue gas processor 6 are in standby state, and the first electromagnetic valve and the second electromagnetic valve are closed.

[0058] When a short circuit or other fault occurs inside the transformer, causing the pressure in the oil tank 1 to rise sharply and exceed the opening pressure of the pressure relief device 21, the pressure relief device 21 opens quickly to release the high-pressure flue gas in the oil tank 1. At the same time, after the control system of the oil-immersed transformer detects the opening signal of the pressure relief device 21, the following actions are triggered immediately:

[0059] The first electromagnetic valve opens, and the liquid pumping pump starts to transport the liquid carbon dioxide in the liquid carbon dioxide container to the injection pipe 42 through the liquid pumping pipe 41 and inject it into the oil tank 1. The liquid carbon dioxide evaporates rapidly after contacting the high-temperature transformer oil, absorbs a large amount of heat, and causes the oil temperature to drop sharply. At the same time, the generated carbon dioxide gas forms an inert atmosphere in the oil tank 1, inhibits the supply of oxygen, and extinguishes the fire source.

[0060] The second electromagnetic valve opens to draw the flue gas discharged by the pressure relief device 21 into the flue gas processor 6 through the flue gas pumping pipe 63. The flue gas first enters the second interval at the bottom of the processing tank, and then enters the inside of the filter cartridge 613 through the air inlet of the filter cartridge 613. In the filter cartridge 613, activated carbon and molecular sieve adsorb harmful substances in the flue gas, such as hydrocarbons and carbon monoxide. The purified flue gas enters the first interval through the air outlet of the filter cartridge 613, and finally is discharged to a safe area through the flue gas discharge pipe 62.

[0061] When the pressure in the oil tank 1 returns to normal and the fire is extinguished, the control system closes the first electromagnetic valve and the liquid pumping pump to stop injecting liquid carbon dioxide. The second electromagnetic valve is kept open for a period of time to ensure that all the residual flue gas in the oil tank 1 is processed. Then, the second electromagnetic valve is closed, and the equipment can enter the maintenance state.

[0062] The oil-immersed transformer can improve the fire extinguishing effect and safety of the oil-immersed transformer in the event of a pressure relief accident through the design of liquid carbon dioxide fire extinguishing, pressure relief, and flue gas treatment.

[0063] In one example embodiment, an oil-immersed transformer is provided. Referring to Figures 1 to 8As shown, the top of the filter cartridge 613 is provided with a retaining edge 6131 which is clamped on the side of the upper support plate 612 facing the first interval; the bottom of the filter cartridge 613 is provided with an extended neck 6132 which is inserted on the lower support plate 611; the filter cartridge 613 comprises a cylinder body, the inside of the cylinder body is provided with a plurality of detachable filter plates 6133, a plurality of the filter plates 6133 are arranged along the axial direction of the filter cartridge 613, and a filler 6135 for filtering flue gas is arranged between adjacent filter plates 6133.

[0064] The cylinder body can be configured as a cylindrical cylinder, and the axial ends of the cylinder body are provided with openings which are the gas inlet and gas outlet of the filter cartridge 613 respectively. The position of the gas outlet of the cylinder body can be provided with an annular retaining edge 6131, and the retaining edge 6131 and the cylinder body can be an integral molding structure or a welded connection structure, which is not limited. The bottom surface of the retaining edge 6131 (i.e. the side facing the upper support plate 612) is in abutment with the upper surface of the upper support plate 612 (i.e. the side facing the retaining edge 6131) to achieve the limiting between the filter cartridge 613 and the upper support plate 612, and also to ensure the sealing.

[0065] The extended neck 6132 is provided with external threads, and the lower support plate 611 is provided with a threaded hole, and the extended neck 6132 and the lower support plate 611 are connected by the external threads and the internal threads to improve the stability of the installation of the filter cartridge 613.

[0066] The inside wall of the cylinder body is provided with an insertion slot 6134 extending along the axial direction of the filter cartridge 613, and the side wall of the filter plate 6133 is provided with a protruding portion matched with the insertion slot 6134, and the filter plate 6133 is connected with the cylinder body by the protruding portion clamped into the insertion slot 6134.

[0067] In this embodiment, the above-mentioned filter cartridge 613 can be conveniently installed between the upper support plate 612 and the lower support plate 611. During installation, the filter cartridge 613 is inserted into the holes on the upper support plate 612 and the lower support plate 611 in sequence, and the retaining edge 6131 is clamped on the upper support plate 612 to limit the position. It should be noted that the filter cartridge 613 in this embodiment is arranged between the upper support plate 612 and the lower support plate 611, which does not mean that the filter cartridge 613 is entirely located between the upper support plate 612 and the lower support plate 611, and part of the axial end structure can also be located in the first interval and the second interval, which is not limited.

[0068] The filler 6135 in the filter cartridge 613 can at least include limestone, activated carbon, and glass fiber cloth, etc. The limestone needs to be crushed and ground into fine limestone powder. The particle size of the limestone can be 300-800 nm. The limestone has the following advantages:

[0069] (1) Low cost: limestone is relatively inexpensive, and the preparation process is simple.

[0070] (2) High efficiency: limestone reacts quickly with sulfur dioxide, and the removal effect is good.

[0071] (3) Easy to operate: the preparation and application process is simple and easy to control.

[0072] The activated carbon can be coconut shell activated carbon, and the particle size can be 8-30 mm. Coconut shell activated carbon with uniform particle size can more effectively adsorb toxic and harmful substances, thereby improving the purification efficiency. The particle size of activated carbon not only affects its applicability in treatment, but also affects its performance and efficiency. Therefore, when selecting activated carbon, it is necessary to select activated carbon with appropriate particle size according to specific application requirements and conditions.

[0073] It should be noted that the filler 6135 can include other substances in addition to the above substances, which are not limited.

[0074] In this embodiment, when the pressure relief device 21 of the oil-immersed transformer is opened, the high-temperature flue gas enters the second interval at the bottom of the treatment box through the smoke extraction pipe 63, and enters the filter cartridge 613 through the extension neck 6132 of the filter cartridge 613. The smoke gas passes through each layer of filter plate 6133 and filler 6135 in the filter cartridge 613 from bottom to top in turn to realize the filtration and purification of the smoke gas. The purified flue gas overflows from the top of the filter cartridge 613, enters the first interval above the upper support plate 612, and is finally discharged through the smoke exhaust pipe 62.

[0075] When the filtration effect is detected to be decreased, the second electromagnetic valve can be closed, and the treatment box maintenance opening can be opened. Then the cartridge body of the filter cartridge 613 is rotated to separate the extension neck 6132 from the internal threads of the lower support plate 611, and the filter cartridge 613 is taken out upward. The filter plate 6133 is gently slid along the direction of the slot 6134, and the filter plate 6133 and the filler 6135 are taken out for replacement. After the replacement is completed, the filter plate 6133 is reinserted into the cartridge body slot 6134, and the extension neck 6132 of the filter cartridge 613 is screwed into the insertion hole of the lower support plate 611 to complete the installation.

[0076] In this embodiment of the oil-immersed transformer, the filter cartridge 613 is doubly secured by a top rib 6131 engaging the upper support plate 612 and a bottom extension neck 6132 threadedly connected to the lower support plate 611, ensuring stability under high-speed flue gas impact. The filter plates 6133 and the cartridge body utilize a removable design using slots 6134 and protrusions, enabling quick assembly and disassembly without tools. Furthermore, multiple layers of filter plates 6133 with different functions, combined with filler 6135, achieve graded filtration of acidic gases, organic matter, moisture, and particulate matter in the flue gas, effectively preventing the emission of harmful flue gases.

[0077] In one exemplary embodiment, an oil-immersed transformer is provided. Figures 1 to 8 As shown, in the oil-immersed transformer, a temperature sensor and a pressure sensor are provided in the oil tank 1 for detecting the temperature and pressure in the oil tank 1 , respectively. The temperature sensor and the pressure sensor are both electrically connected to the first solenoid valve on the liquid extraction pipe 41 .

[0078] The first solenoid valve is in an open state when the temperature value detected by the temperature sensor is greater than or equal to a set temperature threshold, and / or the pressure value detected by the pressure sensor is greater than or equal to a set pressure threshold. For example, when the temperature value detected by the temperature sensor is greater than or equal to the set temperature threshold and the pressure value detected by the pressure sensor is greater than or equal to the set pressure threshold, it indicates that there may be a fire in the fuel tank 1, and the first solenoid valve can be opened. The liquid carbon dioxide in the liquid carbon dioxide container will be sprayed into the fuel tank 1 through the liquid extraction pipe 41 and the injection pipe 42 to achieve a fire extinguishing effect.

[0079] The oil-immersed transformer includes an oil tank 5, which is connected to the bottom of the oil tank 1 via an oil return pipe 51. The oil return pipe 51 is provided with a second solenoid valve, an oil pump 52, and a cooler 53. The temperature sensor and the pressure sensor are both electrically connected to the second solenoid valve on the liquid extraction pipe 41. When the temperature value detected by the temperature sensor is greater than or equal to the set temperature threshold, and / or the pressure value detected by the pressure sensor is greater than or equal to the set pressure threshold, the second solenoid valve is in an open state.

[0080] For example, when the temperature value detected by the temperature sensor is greater than or equal to the set temperature threshold and the pressure value detected by the pressure sensor is greater than or equal to the set pressure threshold, it indicates that there may be a fire in the oil tank 1, and the second solenoid valve can be opened. The transformer oil in the oil tank 1 can be transported to the oil tank 5 through the return oil pipe 51 to achieve oil unloading from the oil tank 1 and reduce the combustion source.

[0081] It should be noted that the above set temperature threshold and set pressure threshold can be set according to actual needs, and the specific values thereof are not limited.

[0082] The cooler 53 comprises a cooling jacket sleeved on the outer periphery of the oil return pipe 51, an upper portion of the cooling jacket is provided with a cooling water inlet, and a lower portion of the cooling jacket is provided with a cooling water outlet. The cooling jacket is injected with cold water to cool the transformer oil discharged from the oil tank 1 through the oil return pipe 51. The discharged oil is cooled by injecting cold water into the cooling jacket, so that the temperature is reduced below the ignition point, further avoiding oil combustion.

[0083] In addition, in the oil-immersed transformer of the embodiment, a plurality of parallelly arranged heat dissipation pipes 11 and heat dissipation fins 12 can be arranged on the side wall of the oil tank 1, and the heat dissipation pipes 11 are in communication with the inside of the oil tank 1. The heat dissipation pipes 11 and the heat dissipation fins 12 play a role in cooling the oil in the oil tank 1, so as to better avoid excessively high oil temperature.

[0084] In addition, the oil-immersed transformer of the embodiment can comprise a protection box 3, and the liquid carbon dioxide container 4, the oil tank 5 and the flue gas processor 6 can be arranged in the protection box 3 to protect them.

[0085] In some embodiments, when the oil-immersed transformer is normally working, the temperature sensor and the pressure sensor collect data in the oil tank 1 in real time. If the temperature and the pressure do not reach the corresponding threshold values, the first electromagnetic valve and the second electromagnetic valve can be controlled to be closed, and the liquid pump and the oil pump 52 stop running. When the temperature sensor detects that the oil temperature is ≥120℃ and / or the pressure sensor detects that the pressure is ≥0.15MPa, it can be determined that there is a fire, the first electromagnetic valve can be opened, the liquid carbon dioxide is sprayed into the oil tank 1 through the liquid suction pipe 41 and the injection pipe 42 to rapidly extinguish the fire and form a carbon dioxide inert environment to inhibit combustion. The second electromagnetic valve can be opened, and the oil pump 52 is started, and the transformer oil in the oil tank 1 is transported to the oil tank 5 through the oil return pipe 51. The hot oil exchanges heat with the cooling water in the cooling jacket when flowing through the cooler 53, and the oil temperature is reduced and then enters the oil tank 5, reducing the combustion source and pressure in the oil tank 1.

[0086] After the fire is eliminated, the oil-immersed transformer can control the first electromagnetic valve and the second electromagnetic valve to be closed, and stop the liquid pump and the oil pump 52 from running. The operation and maintenance personnel check the equipment, supplement the liquid carbon dioxide, clean the oil tank 1 and the oil tank 5, and prepare to resume operation.

[0087] In addition, a liquid level sensor can also be arranged in the oil tank 1 of the embodiment to detect the liquid level of the transformer oil in the oil tank 1. The liquid level sensor can also be electrically connected with the second electromagnetic valve.

[0088] In this embodiment, the temperature and pressure parameters are jointly monitored, which can better control the fire at the initial stage of the fire and prevent the accident from expanding. The liquid carbon dioxide extinguishing and the rapid oil unloading and cooling of the transformer oil can improve the extinguishing efficiency. Moreover, the high-temperature and high-pressure transformer oil is unloaded in time to avoid explosion of the oil tank 1 due to excessive pressure and protect the structure of the transformer.

[0089] In one example embodiment, an oil-immersed transformer is provided. Referring to Figures 1 to 8 As shown, in the oil-immersed transformer, the pressure relief device 21 includes an outer sleeve 211, an inner sleeve 213, a baffle 215, and a spring 216. The inner sleeve 213 is fixedly connected with the sealing cover 2, the bottom of the inner sleeve 213 is in communication with the inside of the oil tank 1, the top of the inner sleeve 213 is sealed, the outer sleeve 211 is sleeved outside the inner sleeve 213, the top of the outer sleeve 211 is provided with a pressure relief port, and the position of the pressure relief port is provided with a connecting neck 212. The smoke extraction pipe 63 is connected with the connecting neck 212 to realize the communication between the smoke extraction pipe 63 and the pressure relief port.

[0090] The side wall of the inner sleeve 213 is provided with a plurality of slits 214, the inner sleeve 213 is provided with a baffle 215 which can slide along the axial direction of the inner sleeve 213, the baffle 215 blocks the communication between the inner sleeve 213 and the oil tank 1, a spring 216 is further arranged between the top of the baffle 215 and the inner sleeve 213, the upper surface of the baffle 215 is provided with a first fixing column for fixing the spring 216, and the top of the inner sleeve 213 is provided with a second fixing column for fixing the spring 216.

[0091] When the explosion relief occurs in the oil tank 1, the pressure inside the oil tank 1 increases, which will lift the baffle, so that the inside of the oil tank 1 is communicated with the slits 214, the gas enters between the inner sleeve 213 and the outer sleeve 211 from the slits 214, and then is discharged from the pressure relief port at the top of the outer sleeve 211 and enters the smoke gas processor 6 for smoke gas treatment. The exhaust pump on the smoke exhaust pipe 62 can accelerate the discharge of the gas. The smoke gas processor 6 can be used to treat the discharged explosion gas, convert the harmful gas into harmless substances by filtering, and discharge them to a safe area, reducing the pollution to the environment and the harm to the personnel.

[0092] The edge of the baffle 215 is provided with guide blocks 2151 equal in number to the number of the slits 214, the slits 214 extend along the axial direction of the inner sleeve 213, the guide blocks 2151 extend into the corresponding slits 214 and can move along the extension direction of the slits 214 to guide the movement of the baffle 215.

[0093] When the oil-immersed transformer is in normal operation, the spring 216 is in pre-compression state, the baffle 215 is tightly attached to the bottom of the inner sleeve 213, and the communication port between the oil tank 1 and the inner sleeve 213 is completely blocked. The transformer oil and gas cannot enter the pressure relief device 21, and the support 43 of the injection pipe 42 stably supports the injection pipe 42, and the system remains sealed. When the pressure in the oil tank 1 is too high, the pressure pushes the baffle 215 to slide upward against the force of the spring 216. The guide block 2151 moves upward along the slit 214, ensuring that the baffle 215 rises smoothly until it rises to the top of the slit 214, and the high-pressure gas in the oil tank 1 enters the annular space between the inner sleeve 211 and the outer sleeve 213 through the slit 214, then enters the smoke extraction pipe 63 through the pressure relief port and the connecting neck 212, and finally is discharged into the smoke treatment device 6. When the pressure in the oil tank 1 decreases, the spring 216 pushes the baffle 215 to fall back to the initial position, reseals the bottom of the inner sleeve 213, and stops the relief. During the entire process, the support 43 of the injection pipe 42 remains stable, ensuring that the injection pipe 42 does not displace or shake.

[0094] The embodiment can well improve the safety and fire extinguishing effect of the oil-immersed transformer explosion relief accident.

[0095] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0096] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be used only to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, the terms such as "first", "second" and other numerical terms are used herein without implying an order or sequence. Therefore, the first element, component, region, layer or section discussed below can be referred to as a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0097] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the scope of the application is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalents are intended to be embraced therein.

Claims

1. An oil-immersed transformer, characterized in that: The oil-immersed transformer includes a transformer body, a liquid carbon dioxide container and a flue gas processor; The transformer body includes an oil tank containing transformer oil. The top of the oil tank is open and provided with a detachable sealing cover, and the sealing cover is provided with at least one pressure relief device. The liquid carbon dioxide container is connected to the injection pipe through a liquid extraction pipe. The injection pipe is arranged at the upper part of the interior of the oil tank and is used to inject liquid carbon dioxide into the oil tank. The liquid extraction pipe is provided with a first solenoid valve and a liquid extraction pump. The flue gas processor is connected to the pressure relief port of the pressure relief device through a smoke extraction pipe. The flue gas processor includes a processing box and a filter located in the processing box. The filter includes an upper support plate, a lower support plate and at least one filter cartridge arranged between the upper support plate and the lower support plate. The upper support plate and the top of the processing box have a first gap, and the lower support plate and the bottom of the processing box have a second gap. The air outlet of the filter cartridge is connected to the first gap, the air inlet of the filter cartridge is connected to the second gap, the smoke extraction pipe is connected to the second gap, and the exhaust pipe of the flue gas processor is connected to the first gap. An exhaust pipe is provided on the box body at the upper part of the upper support plate.

2. The oil-immersed transformer according to claim 1, characterized in that: A rib is provided on the top of the filter cartridge, and the rib is clamped on the side of the upper support plate facing the first interval; an extension neck is provided on the bottom of the filter cartridge, and the extension neck is inserted into the lower support plate; the filter cartridge includes a cylinder body, and a plurality of detachable filter plates are provided inside the cylinder body. The plurality of filter plates are arranged along the axial direction of the filter cartridge, and fillers for filtering smoke are provided between adjacent filter plates.

3. The oil-immersed transformer according to claim 2, characterized in that: The extension neck is provided with an external thread, and the lower support plate is provided with a socket with an internal thread. The extension neck and the lower support plate are threadedly connected through the external thread and the internal thread.

4. The oil-immersed transformer according to claim 2, characterized in that: A slot extending along the axial direction of the filter cylinder is provided on the inner side wall of the cylinder, and a protrusion cooperating with the slot is provided on the side wall of the filter plate. The filter plate is snapped into the slot through the protrusion to achieve a detachable connection with the cylinder.

5. The oil-immersed transformer according to claim 1, characterized in that: A temperature sensor and a pressure sensor are provided in the oil tank, and both the temperature sensor and the pressure sensor are electrically connected to the first solenoid valve on the liquid extraction pipe; Wherein, when the temperature value detected by the temperature sensor is greater than or equal to a set temperature threshold, and / or the pressure value detected by the pressure sensor is greater than or equal to a set pressure threshold, the first solenoid valve is in an open state.

6. The oil-immersed transformer according to claim 5, characterized in that: The oil-immersed transformer includes an oil tank, which is connected to the bottom of the oil tank through an oil return pipe. A second solenoid valve, an oil pump and a cooler are provided on the oil return pipe. The temperature sensor and the pressure sensor are both electrically connected to the second solenoid valve on the oil extraction pipe. Wherein, when the temperature value detected by the temperature sensor is greater than or equal to the set temperature threshold, and / or the pressure value detected by the pressure sensor is greater than or equal to the set pressure threshold, the second solenoid valve is in an open state.

7. The oil-immersed transformer according to claim 6, characterized in that: The cooler includes a cooling jacket, which is sleeved on the outer circumference of the oil return pipe. A cooling water inlet is provided at the upper portion of the cooling jacket, and a cooling water outlet is provided at the lower portion of the cooling jacket. The cooling jacket cools the transformer oil discharged from the oil tank through the oil return pipe by injecting cold water.

8. The oil-immersed transformer according to claim 1, characterized in that: A support member for supporting the injection pipe is provided on the upper part of the inner wall of the oil tank. The support member includes a support frame and a fixing clamp. The support frame is fixedly connected to the inner wall of the oil tank, and the fixing clamp is fixedly connected to the support frame. The fixing clamp is used to clamp the injection pipe.

9. The oil-immersed transformer according to any one of claims 1 to 8, characterized in that: The pressure relief device comprises an outer sleeve, an inner sleeve, a baffle and a spring; The inner sleeve is fixedly connected to the sealing cover, and the bottom of the inner sleeve is in communication with the interior of the oil tank. The top of the inner sleeve is sealed. The outer sleeve is sleeved on the outside of the inner sleeve. A pressure relief port is provided on the top of the outer sleeve, and a connecting neck is provided at the position of the pressure relief port. The smoke extraction pipe is connected to the connecting neck to achieve communication between the smoke extraction pipe and the pressure relief port. A plurality of slits are provided on the side wall of the inner sleeve, and a baffle which can slide along the axial direction of the inner sleeve is provided in the inner sleeve, and the baffle blocks the connection between the inner sleeve and the oil tank, and a spring is also provided above the baffle and between the inner sleeve, and a first fixing column for fixing the spring is provided on the upper surface of the baffle, and a second fixing column for fixing the spring is provided on the top of the inner sleeve.

10. The oil-immersed transformer according to claim 9, characterized in that: The edge of the baffle is provided with guide blocks equal in number to the slits, the slits extend axially along the inner sleeve, and the guide blocks extend into the corresponding slits and can move along the extension direction of the slits to guide the movement of the baffle.

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