Leak-proof oil-immersed transformer

Abstract

This application discloses a leak-proof oil-immersed transformer for use in the field of transformers. This oil-immersed transformer can effectively fix the seal during installation by using a combination of pre-fixed parts, mounting bolts, and an oil-absorbing fixing layer. Without increasing the difficulty of operation, the pre-fixed parts can be used to fix the connection of the seal by wrapping, effectively replacing the original binding or pressing method, improving the stability of the seal during the fixing and installation process. The semi-fluid state of the pre-fixed parts can also be used to overflow and fill the gap, further improving the stability of the seal during installation, thereby improving the sealing performance of the connection between the tank shell and the tank cover, effectively preventing oil leakage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of transformers, in particular to a leakage-proof oil-immersed transformer. BACKGROUND

[0002] The transformer is one of the main electrical equipment in the transformer substation, and the power transformer in China is mainly oil-immersed transformer, which is mainly composed of a core, a winding, an oil tank, an oil pillow, an insulation sleeve, a tapping switch and a gas relay, etc. The oil tank of the oil-immersed transformer is composed of a tank shell and a tank cover, the body of the transformer is installed in the oil tank, and then the oil tank is filled with transformer oil to play the role of insulation and cooling.

[0003] The tank shell and the tank cover of the oil tank of the oil-immersed transformer are sealed by oil-resistant rubber rods or rubber pads, and the sealing part is then fixed by pressing fasteners. The main reason for the leakage of the transformer is the looseness of the fasteners or the damage of the sealing parts. The leakage not only reduces the service life of the transformer, affects the safe and stable operation of the system, but also seriously affects the economic benefits of the society and the users. Therefore, how to prevent the oil-immersed transformer from leaking is still one of the problems to be solved.

[0004] In the prior art, when the sealing part of the oil tank of the oil-immersed transformer is installed, the joints at both ends of the sealing part need to be treated, and generally binding or pressing and fixing are adopted. However, in actual assembly and installation, the sealing part will roll or move in the tank groove, which is easy to cause the stability of the connection of the interface of the sealing part, and the problems of loose interface or poor connection, thereby directly reducing the sealing quality and safety of the oil tank of the oil-immersed transformer, and easily causing the problem of leakage of transformer oil of the oil tank of the oil-immersed transformer. SUMMARY

[0005] The present application aims to prevent the oil-immersed transformer from leaking by solving the installation and connection stability of the interface of the oil tank sealing part. Compared with the prior art, a leakage-proof oil-immersed transformer is provided, which comprises a transformer body, the transformer body comprises an oil tank shell and an oil tank cover sealed and connected with the oil tank shell, a sealing ring groove is formed at the lower end of the oil tank cover, a plurality of pre-fixed parts matched with the sealing ring groove are embedded in the sealing ring groove, an oil absorption fixing layer is fixedly connected to the lower end of the pre-fixed part, a plurality of mounting bolts are fixedly connected to the upper end of the oil absorption fixing layer, the upper end of the mounting bolt penetrates the pre-fixed part and the oil tank cover in sequence, and an induction display is fixedly connected to the mounting bolt, and a mounting nut is threadedly connected to the outer end of the mounting bolt and located on the upper side of the oil tank cover.

[0006] A sealing leakage sensing unit is installed inside the transformer body. This unit includes a signal processing module. The input of the signal processing module is connected to a constant conduction module, and the output is connected to a leakage warning unit. The input of the constant conduction module is connected to a signal display via a wire, and the output of the leakage warning unit is connected to an alarm signal installed on the transformer body via a wire. Through the cooperation of pre-fixing components, mounting bolts, and an oil-absorbing fixing layer, the sealing components can be effectively pre-fixed during installation. Without increasing operational difficulty, the pre-fixing components effectively secure the connection points of the sealing components using their enveloping properties. Replacing the original binding or pressing methods, this method improves the stability of the seals during the fixed installation process. It also allows for overflow filling of the mating gaps through the semi-fluid state of the pre-fixed components, further enhancing the stability of the seals during installation. This, in turn, improves the sealing performance of the connection between the tank shell and the tank cover, effectively preventing oil leakage. Furthermore, with the cooperation of the sensor display and the sealing leakage sensing unit, it can monitor the sealing leakage status of the transformer body, effectively improving the safety and intelligence of the transformer body during use, increasing the efficiency and monitoring accuracy of seal maintenance, and thus effectively reducing the damage caused by leakage.

[0007] Optionally, the mounting bolts have pre-drilled holes. An upper inductive contact is fixedly connected to the lower end of the inductive display, and a conductive strip is fixedly connected to the lower end of the upper inductive contact. Multiple lower inductive contacts, corresponding to the upper inductive contacts, are fixedly connected to the lower end of the oil-absorbing fixing layer. The lower end of the conductive strip extends through the upper inductive contact into the oil-absorbing fixing layer and is fixedly connected to the lower inductive contacts. When there is no leakage of transformer oil from the tank shell and the tank cover seal, the short circuit effect of the upper inductive contact, lower inductive contact, and conductive strip can effectively control the flash lamp. The effect is that the transformer body remains unchanged during use. However, after oil leakage occurs, the oil absorption of the oil-absorbing fixing layer will cause the conductive strip to disperse under the action of transformer oil, short-circuiting the connection between the upper and lower inductive connecting contacts. This will activate the flashing light, which not only provides flashing and alarm signals to maintenance personnel, but also allows for timely monitoring of oil leakage. This enables maintenance personnel to assess the condition of the seals without disassembling the tank shell, facilitating timely and effective handling of the leakage and reducing the hazards caused by continuous leakage.

[0008] Optionally, the conductive strip is made of graphite powder by pressure pressing, and the particle size of the graphite powder is smaller than the fiber gap of the oil-absorbing fixing layer. Graphite has electrical conductivity, and the graphite powder can be dispersed under the action of transformer oil, effectively playing the dual role of short circuit and monitoring, effectively achieving low cost and high effect.

[0009] Optionally, the input terminal of the constant conduction module is connected to the upper induction contact signal via a wire. When the conduction bar is in the complete state, the upper induction contact remains in a constant conduction state. When the conduction bar is located in the oil absorption fixing layer and absorbs transformer oil in the oil absorption fixing layer, the upper induction contact switches to open, thereby facilitating the constant conduction module to sense the sealing state.

[0010] Optionally, a flash LED is fixedly installed inside the sensor display. The output terminal of the leakage warning unit is connected to the flash LED signal via a wire. After the upper sensing connection contact is disconnected, the flash LED's electrical signal is activated. Here, the conduction of the upper sensing connection contact, the lower sensing connection contact, and the conductive strip forms a short circuit connection for the flash LED. After the seal is damaged by high temperature or other factors, the damage force will have a continuous effect on the conductive strip, which will also cause the conductive strip to break, causing the flash LED to generate a warning signal. This effectively monitors the sealing status of the tank shell and tank cover, preventing leakage and reducing the maintenance difficulty of the transformer body. Furthermore, the setting of multiple sensor displays can also assist maintenance personnel in predicting the leakage location, thereby effectively improving maintenance efficiency.

[0011] Optionally, the oil-absorbing fixing layer is made of oil-absorbing fiber, and the oil-absorbing fixing layer cooperates with the conductive strip through the preset groove opened at its upper end. The oil-absorbing fixing layer can absorb the leaked oil, effectively preventing the leaked oil from contaminating other components or causing local short circuits in the transformer body. While effectively playing a monitoring role, it can also treat the leaked oil, improve the stability of the transformer body operation, buy time for maintenance, and reduce the economic losses of users.

[0012] Optionally, the pre-fixing component is made of a semi-fluid gel-like material. This semi-fluid pre-fixing component not only generates overflow wrapping during the installation of the seals but also has a certain degree of adhesion, facilitating the fixing and retention of the seal connection. This effectively prevents the seals from moving during the connection between the tank shell and the tank cover, thereby improving the stability of the interface. Furthermore, the pre-fixing component can also overflow and fill the gap at the connection between the tank shell and the tank cover, effectively maintaining the sealing effect of the connection between the tank shell and the tank cover. This effectively prevents moisture and other substances from the external environment from entering the tank shell and damaging the internal transformer components, thereby effectively extending the service life of the transformer body.

[0013] Optionally, the upper end of the sealing ring groove is provided with multiple pre-positioning grooves corresponding to the positions of the pre-fixed components, and the pre-fixed components are set in the corresponding pre-positioning grooves. The pre-positioning grooves guide and restrict the overflow deformation of the pre-fixed components. While maintaining the wrapping of the pre-fixed components with the seal, it also effectively avoids the situation where the connection between the tank shell and the tank cover is uneven due to the overflow of the pre-fixed components, thus improving the connection efficiency and connection quality.

[0014] Optionally, a connecting sensing groove is provided at the lower end of the pre-fixed component, and the pre-fixed component is bonded to the oil-absorbing fixing layer through the connecting sensing groove. The oil-absorbing fixing layer can fix the pre-fixed component and also pre-deform and compress the pre-fixed component to maintain the saturation of the overflow state of the pre-fixed component, thereby improving the wrapping effect of the pre-fixed component on the seal.

[0015] Optionally, the sealing connection method for the transformer body's tank shell and tank cover is as follows:

[0016] S1. Pre-fixation,

[0017] S11. First, insert the mounting bolts through the upper end of the oil tank cover, and fix the pre-fixed parts in the pre-positioning groove by the action of the oil absorption fixing layer;

[0018] S12. By pulling up the mounting bolt, the oil-absorbing fixing layer is driven to generate extrusion force on the pre-fixed part. Then, at the same time, the mounting nut is screwed onto the outer end of the mounting bolt from the top of the oil tank cover to fix the pre-fixed part in the pre-positioning groove, and the outer side of the pre-fixed part undergoes overflow deformation under the extrusion action of the oil-absorbing fixing layer.

[0019] S13. Press the seal into the sealing ring groove and set the connection of the seal in the pre-fixed part. The pre-fixed part is squeezed out of the pre-fixed part by the seal and deformed, so that the pre-fixed part forms a wrapping effect on the connection of the seal and is bonded and fixed.

[0020] S2. Install the components, and install the transformer components inside the tank casing;

[0021] S3. Tighten the seal. Finally, fix the pre-sealed tank cover to the upper end of the tank shell with fasteners, and make the lower end of the seal squeeze and engage in the groove at the upper end of the tank shell.

[0022] S4. Sealing Self-Check: The sealing leakage sensing unit is activated. Based on the status of the sensor display, a self-check of the sealing connection between the tank shell and the tank cover is performed. After passing the check, the transformer body is put into use. The pre-fixed components effectively improve the stability of the sealing components during installation, thereby enhancing the stability of the connection between the tank shell and the tank cover. Furthermore, the overflow wrapping effect of the pre-fixed components simplifies and speeds up operation, reducing the difficulty of transformer body installation. During the use of the transformer body, the pre-fixed components undergo dehydration and high-temperature treatment to continuously solidify, improving connection stability and strength, further enhancing the stability of the sealing connection during use, and effectively preventing leakage.

[0023] Compared to existing technologies, the advantages of this application are:

[0024] (1) The pre-fixed parts, mounting bolts and oil-absorbing fixing layer can effectively pre-fix the seal during installation. Without increasing the difficulty of operation, the pre-fixed parts can be used to fix the connection of the seal, effectively replacing the original binding or pressing method, improving the stability of the seal during the fixed installation process. The semi-fluid state of the pre-fixed parts can also be used to overflow and fill the gap, further improving the stability of the seal during installation, thereby improving the sealing performance of the connection between the tank shell and the tank cover, effectively preventing oil leakage.

[0025] (2) With the cooperation of the sensor display and the sealing leakage sensing unit, the sealing leakage condition of the transformer body can also be monitored, which effectively improves the safety and intelligence of the transformer body during use, improves the efficiency and monitoring accuracy of sealing maintenance, and thus effectively reduces the harm caused by leakage.

[0026] (3) After oil leakage occurs, the oil absorption of the oil-absorbing fixing layer will cause the conductive strip to disperse under the action of transformer oil, short-circuiting the connection between the upper and lower inductive connecting contacts, causing the flashlight to work. This not only provides flashing and alarm signals to maintenance personnel, but also allows for timely monitoring of the oil leakage situation. This enables maintenance personnel to judge the condition of the seals without disassembling the tank shell, facilitating timely and effective handling of the leakage situation and reducing the harm caused by continuous leakage.

[0027] (4) The connection of the upper induction contact, the lower induction contact and the conductive strip forms a short circuit connection with the flash lamp bead. After the seal is damaged by high temperature or other factors, the damage force will have a continuous effect on the conductive strip, which will also cause the conductive strip to break, so that the flash lamp bead will generate a warning signal. This will effectively monitor the sealing status of the tank shell and the tank cover, avoid leakage, reduce the maintenance difficulty of the transformer body, and the setting of multiple induction displays can also help maintenance personnel to predict the leakage location, thereby effectively improving maintenance efficiency.

[0028] (5) The oil-absorbing fixing layer can absorb the leaked oil, effectively preventing the leaked oil from contaminating other components or causing local short circuits in the transformer body. While effectively playing a monitoring role, it can also treat the leaked oil, improve the stability of the transformer body operation, buy time for maintenance, and reduce the economic losses of users.

[0029] (6) The semi-fluid pre-fixed component can not only generate overflow wrapping when installing the seal, but also make it have a certain degree of viscosity, which makes it easy to fix and maintain the connection of the seal. This effectively avoids the movement of the seal when the tank shell and the tank cover are connected, thereby improving the stability of the interface. In addition, the pre-fixed component can also generate overflow filling at the gap between the tank shell and the tank cover, effectively maintaining the sealing effect of the connection between the tank shell and the tank cover, effectively preventing moisture and other substances in the external environment from entering the tank shell and causing damage to the transformer components inside, thereby effectively extending the service life of the transformer body.

[0030] (7) The pre-fixing component effectively improves the stability of the seal during installation by pre-wrapping and fixing the seal, thereby improving the stability of the connection between the tank shell and the tank cover. The overflow wrapping effect of the pre-fixing component can effectively achieve simple and fast operation, reducing the difficulty of transformer body installation. During the use of the transformer body, the pre-fixing component can also be dehydrated and cured by high temperature, improving its connection stability and increasing its connection strength, further improving the stability of the seal connection during use, and effectively preventing leakage. Attached Figure Description

[0031] Figure 1 This is an isometric drawing of the transformer body in this application;

[0032] Figure 2 This is the control logic diagram of the transformer body sealing leakage sensing unit of this application;

[0033] Figure 3 Exploded view of the fuel tank shell and fuel tank cover in this application;

[0034] Figure 4 Exploded view of the pre-fixed component and oil-absorbing fixing layer in this application;

[0035] Figure 5 This is a front sectional view showing the fit between the pre-fixed component and the oil-absorbing fixing layer in this application.

[0036] Figure 6 This is a diagram showing the sensing state of the sensor display and the oil-absorbing fixing layer in this application.

[0037] Figure 7 This is a simplified circuit connection diagram of the sensor display in this application;

[0038] Figure 8 This is a flowchart illustrating the sealing connection method between the fuel tank shell and the fuel tank cover of this application.

[0039] Figure 9 This is a diagram showing the pre-fixed installation state of the fuel tank cover in this application;

[0040] Figure 10 Exploded view of the pre-fixed installation of the fuel tank cover in this application.

[0041] Explanation of the labels in the diagram:

[0042] 1 Transformer body, 2 Oil tank shell, 201 Oil tank cover, 202 Sealing ring groove, 203 Pre-positioning groove, 3 Sealing component, 4 Pre-fixing component, 401 Connecting induction groove, 5 Induction display, 501 Upper induction connection contact, 502 Lower induction connection contact, 6 Mounting bolt, 601 Mounting nut, 602 Reserved hole, 7 Oil suction fixing layer, 8 Conductor strip. Detailed Implementation

[0043] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0044] Example 1

[0045] This application discloses a leak-proof oil-immersed transformer. Please refer to [link / reference]. Figures 1-10 The transformer body 1 includes an oil tank shell 2 and an oil tank cover 201 that is sealed to the oil tank shell 2. A sealing ring groove 202 is provided at the lower end of the oil tank cover 201. Multiple pre-fixing parts 4 are embedded in the sealing ring groove 202. An oil-absorbing fixing layer 7 is fixedly connected to the lower end of the pre-fixing parts 4. The oil-absorbing fixing layer 7 is a chemically synthesized oil-absorbing fiber. The main materials are polypropylene, polyurethane, alkyl ethylene polymer, etc. It has the advantages of fast oil absorption speed, high oil absorption rate, good overall performance, and convenient use and recycling. Multiple mounting bolts 6 are fixedly connected to the upper end of the oil-absorbing fixing layer 7. The upper end of the mounting bolts 6 passes through the pre-fixing parts 4 and the oil tank cover 201 in sequence, and is fixedly connected to a sensor display 5. The sensor display 5 is made of transparent material so that when the flash lamp inside is lit, it does not block the light of the flash lamp. The outer end of the mounting bolts 6 is threadedly connected to a mounting nut 601 located on the upper side of the oil tank cover 201.

[0046] A sealing leakage sensing unit is installed inside the transformer body 1. This unit includes a signal processing module. The input of the signal processing module is connected to a constant conduction module, and the output of the signal processing module is connected to a leakage warning unit. The input of the constant conduction module is connected to the signal of the sensing display 5 via a wire, and the output of the leakage warning unit is connected to the signal of an alarm installed on the transformer body 1 via a wire. Through the cooperation of the pre-fixing component 4, the mounting bolts 6, and the oil-absorbing fixing layer 7, the sealing component 3 can be effectively pre-fixed during installation. Without increasing the difficulty of operation, the pre-fixing component 4 effectively fixes the connection of the sealing component 3 using its enveloping properties. Instead of the original binding or pressing method, the stability of the sealing component 3 during the fixed installation process is improved. It can also overflow and fill the mating gap through the semi-fluid state of the pre-fixed component 4, further improving the stability of the sealing component 3 during installation. This improves the sealing performance of the connection between the tank shell 2 and the tank cover 201, effectively preventing oil leakage. Furthermore, with the cooperation of the sensor display 5 and the sealing leakage sensing unit, the sealing leakage status of the transformer body 1 can be monitored, effectively improving the safety and intelligence of the transformer body 1 during use, increasing the efficiency and monitoring accuracy of sealing maintenance, and thus effectively reducing the damage caused by leakage.

[0047] Please see Figures 3-7 A pre-drilled hole 602 is provided in the mounting bolt 6. An upper inductive communication contact 501 is fixedly connected to the lower end of the inductive display 5, and a conductive strip 8 is fixedly connected to the lower end of the upper inductive communication contact 501. Multiple lower inductive communication contacts 502, corresponding to the positions of the upper inductive communication contacts 501, are fixedly connected to the lower end of the oil-absorbing fixing layer 7. The lower end of the conductive strip 8 extends through the upper inductive communication contact 501 into the oil-absorbing fixing layer 7 and is fixedly connected to the lower inductive communication contacts 502. When there is no leakage of transformer oil from the sealing points of the tank shell 2 and the tank cover 201, the upper inductive communication contact 501, lower inductive communication contact 502, and conductive strip 8... The short circuit effectively affects the flashlight, allowing the transformer body 1 to remain unchanged. However, in the event of oil leakage, the oil absorption of the oil-absorbing fixing layer 7 causes the conductive strip 8 to disperse under the action of the transformer oil, short-circuiting the connection between the upper inductive contact 501 and the lower inductive contact 502. This activates the flashlight, providing flashing and alarm signals to maintenance personnel and enabling timely monitoring of oil leakage. Maintenance personnel can assess the condition of the seal 3 without disassembling the tank shell 2, facilitating timely and effective handling of the leakage and reducing the hazards caused by continuous leakage.

[0048] Please see Figures 5-7The conductive strip 8 is made of graphite powder by pressure pressing, and the particle size of the graphite powder is smaller than the fiber gap of the oil-absorbing fixing layer 7. Graphite has electrical conductivity, and the graphite powder can be dispersed under the action of transformer oil, effectively playing the dual role of short circuit and monitoring, effectively achieving low cost and high effect.

[0049] Please see Figures 1-7 The input terminal of the constant conduction module is connected to the upper induction contact 501 via a wire. When the conduction bar 8 is in the complete state, the upper induction contact 501 maintains a constant conduction state. When the conduction bar 8 is located in the oil absorption fixing layer 7 and the oil absorption fixing layer 7 absorbs transformer oil and causes dispersion, the upper induction contact 501 switches to disconnection, so as to facilitate the constant conduction module to sense the sealing state.

[0050] Please see Figures 1-7 A flashing LED is fixedly installed inside the sensor display 5. The output terminal of the leakage warning unit is connected to the flashing LED signal via a wire. After the upper sensing connection contact 501 is disconnected, the electrical signal of the flashing LED is connected. Here, the conduction of the upper sensing connection contact 501, the lower sensing connection contact 502 and the conductive strip 8 forms a short circuit connection for the flashing LED. After the seal 3 is damaged by high temperature or other factors, the damage force will have a continuous effect on the conductive strip 8, which will also cause the conductive strip 8 to break, causing the flashing LED to generate a warning signal. This can effectively monitor the sealing status of the tank shell 2 and the tank cover 201, avoid leakage, reduce the maintenance difficulty of the transformer body 1, and the setting of multiple sensor displays 5 can also help maintenance personnel to predict the leakage location, thereby effectively improving maintenance efficiency.

[0051] Please see Figures 1-7 The oil-absorbing fixing layer 7 is made of oil-absorbing fiber, and the oil-absorbing fixing layer 7 cooperates with the conductive strip 8 through the preset groove opened at its upper end. The oil-absorbing fixing layer 7 can absorb the leaked oil, effectively preventing the leaked oil from contaminating other components or causing local short circuits in the transformer body 1. While effectively playing a monitoring role, it can also treat the leaked oil, improve the stability of the transformer body 1, buy time for maintenance, and reduce the economic losses of users.

[0052] Please see Figures 1-7The pre-fixing component 4 is a semi-fluid gel-like material made of clean soft rubber. It is made by mixing white glue, liquid glue, and baking soda in a certain proportion, generally 1:0.5-1:0.2-0.5. The semi-fluid pre-fixing component 4 can not only overflow and wrap the seal 3 during installation, but also has a certain degree of adhesion, which facilitates the fixing and retention of the connection of the seal 3. This effectively avoids the movement of the seal 3 when the tank shell 2 and the tank cover 201 are connected, thereby improving the stability of the interface. In addition, the pre-fixing component 4 can also overflow and fill the gap at the connection between the tank shell 2 and the tank cover 201, effectively maintaining the sealing effect of the connection between the tank shell 2 and the tank cover 201. This effectively prevents moisture and other substances in the external environment from entering the tank shell 2 and damaging the transformer components inside, thereby effectively extending the service life of the transformer body 1.

[0053] Please see Figures 1-7 The upper end of the sealing ring groove 202 is provided with a plurality of pre-positioning grooves 203 corresponding to the positions of the pre-fixing member 4, and the pre-fixing member 4 is set in the corresponding pre-positioning groove 203. The pre-positioning groove 203 guides and restricts the overflow deformation of the pre-fixing member 4. While maintaining the wrapping of the pre-fixing member 4 with the sealing member 3, it also effectively avoids the situation where the connection between the oil tank shell 2 and the oil tank cover 201 is uneven due to the overflow of the pre-fixing member 4, thereby improving the connection efficiency and connection quality.

[0054] Please see Figures 8-10 The lower end of the pre-fixed component 4 is provided with a connecting sensing groove 401, and the pre-fixed component 4 is bonded to the oil-absorbing fixing layer 7 through the connecting sensing groove 401. The oil-absorbing fixing layer 7 can fix the pre-fixed component 4 and can also pre-deform and compress the pre-fixed component 4 to maintain the saturation of the overflow state of the pre-fixed component 4, thereby improving the wrapping effect of the pre-fixed component 4 on the sealing component 3.

[0055] Please see Figures 1-10 The sealing connection method between the oil tank shell 2 and the oil tank cover 201 of the transformer body 1 is as follows:

[0056] S1. Pre-fixation,

[0057] S11. First, insert the mounting bolt 6 through the upper end of the oil tank cover 201, and fix the pre-fixed part 4 in the pre-positioning groove 203 by the action of the oil absorption fixing layer 7.

[0058] S12. By pulling up the mounting bolt 6, the oil-absorbing fixing layer 7 is driven to generate a squeezing force on the pre-fixed part 4. Then, at the same time, the mounting nut 601 is screwed onto the outer end of the mounting bolt 6 from the upper end of the oil tank cover 201, fixing the pre-fixed part 4 in the pre-positioning groove 203, and causing the outer side of the pre-fixed part 4 to undergo overflow deformation under the squeezing action of the oil-absorbing fixing layer 7.

[0059] S13. Press the seal 3 into the sealing ring groove 202 and set the connection of the seal 3 in the pre-fixed member 4. The pre-fixed member 4 is squeezed out of the pre-fixed member 4 by the seal 3, so that the pre-fixed member 4 forms a wrapping effect on the connection of the seal 3 and is bonded and fixed.

[0060] S2. Install the components, and install the transformer components inside the tank housing 2;

[0061] S3. Tighten the seal. Finally, fix the pre-sealed tank cover 201 to the upper end of the tank shell 2 with fasteners, and make the lower end of the seal 3 squeeze and snap into the groove at the upper end of the tank shell 2.

[0062] S4. Seal self-test: Connect the seal leakage sensing unit and, based on the status of the sensing display 5, perform a seal connection self-test on the current sealing status of the tank shell 2 and the tank cover 201. After passing the test, put the transformer body 1 into use. The pre-fixing component 4 pre-wraps and fixes the sealing component 3, effectively improving the stability of the sealing component 3 during installation, thereby improving the stability of the connection between the tank shell 2 and the tank cover 201. Furthermore, the overflow wrapping effect of the pre-fixing component 4 effectively achieves simple and quick operation, reducing the difficulty of installing the transformer body 1. During the use of the transformer body 1, the pre-fixing component 4 can also be continuously cured by dehydration and high temperature, improving its connection stability and increasing its connection strength, further improving the stability of the connection of the sealing component 3 during use, and effectively playing a role in preventing leakage.

[0063] Please see ​During continuous use of the transformer body 1, the sealing leakage sensing unit remains in a continuously weakly connected state. When there is no leakage at the sealing points of the tank shell 2 and the tank cover 201, the conductive strip 8 maintains the connection between the upper sensing contact 501 and the lower sensing contact 502. The constant conduction module maintains a constant conduction signal. After receiving the signal, the signal processing module does not act on the leakage warning unit, and the leakage warning unit does not act on the alarm. At the same time, the upper sensing contact 501 and the lower sensing contact 502 continuously short-circuit the flash lamp through the conductive strip 8, and the flash lamp remains in a constantly off state. When leakage occurs at the sealing points of the tank shell 2 and the tank cover 201 due to high temperature or other factors, Transformer oil will seep out from seal 3. At this time, the oil-absorbing and fixing layer 7 will preferentially absorb the transformer oil to prevent the oil from spreading and damaging the output devices of the transformer body 1. While the oil-absorbing and fixing layer 7 is continuously absorbing the transformer oil, the transformer oil will continuously act on the conductor strip 8 through the fiber gaps, continuously permeating it. Then, under the suction of the oil-absorbing and fixing layer 7, the oil will spread to the end of the conductor strip 8 located in the oil-absorbing and fixing layer 7, causing the conductor strip 8 to break. The circuit connecting the upper inductive contact 501 and the lower inductive contact 502 will be broken. The constant conduction module receives the break signal and transmits the signal to the signal processing module. After judging the signal, the signal processing module controls the permeation warning unit to start. The alarm is activated, causing the transformer body 1 to emit a sealing alarm signal. Due to the disconnection of the upper inductive contact 501 and the lower inductive contact 502, the flashing LED is activated, emitting a flashing light. This not only signals a leak to maintenance personnel but also assists them in identifying the leak location, allowing for early protection of the output devices at the leak site before proceeding with maintenance of the transformer body 1. This reduces the contamination and damage of transformer oil to other components, minimizes the hazards caused by leaks, and improves maintenance efficiency. The pre-fixed component 4, mounting bolts 6, and oil-absorbing fixing layer 7 effectively pre-fix the seal 3 during installation without increasing operational difficulty. The encapsulation mechanism secures the connection of the seal 3, effectively replacing the original binding or pressing method, improving the stability of the seal 3 during installation. Furthermore, the semi-fluid state of the pre-fixed component 4 allows for overflow filling of the mating gap, further enhancing the stability of the seal 3 during installation. This, in turn, improves the sealing performance of the connection between the tank shell 2 and the tank cover 201, effectively preventing oil leakage. Moreover, in conjunction with the sensor display 5 and the sealing leakage sensing unit, it can monitor the sealing leakage status of the transformer body 1, effectively improving the safety and intelligence of the transformer body 1 during use, increasing the efficiency and monitoring accuracy of sealing maintenance, and thus effectively reducing the damage caused by leakage.

[0064] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and its improved concept, should be covered within the scope of protection of this application.

Claims

1. A leak-proof oil-immersed transformer, comprising a transformer body (1), wherein the transformer body (1) includes an oil tank shell (2) and an oil tank cover (201) sealed to the oil tank shell (2), characterized in that, The lower end of the oil tank cover (201) is provided with a sealing ring groove (202). Multiple pre-fixing parts (4) are embedded in the sealing ring groove (202) and cooperate with it. The lower end of the pre-fixing part (4) is fixedly connected to an oil-absorbing fixing layer (7). The upper end of the oil-absorbing fixing layer (7) is fixedly connected to multiple mounting bolts (6). The upper end of the mounting bolts (6) passes through the pre-fixing part (4) and the oil tank cover (201) in sequence, and is fixedly connected to a sensor display (5). The outer end of the mounting bolts (6) is threadedly connected to a mounting nut (601) located on the upper side of the oil tank cover (201). The transformer body (1) is provided with a sealing leakage sensing unit. The sealing leakage sensing unit includes a signal processing module. The input end of the signal processing module is connected to a constant conduction module. The output end of the signal processing module is connected to a penetration warning unit. The input end of the constant conduction module is connected to the sensing display (5) via a wire. The output end of the penetration warning unit is connected to the alarm installed on the transformer body (1) via a wire. The mounting bolt (6) has a reserved hole (602). The lower end of the sensor display (5) is fixedly connected to an upper sensor communication contact (501) that is connected to it. The lower end of the upper sensor communication contact (501) is fixedly connected to a conductive strip (8). The lower end of the oil-absorbing fixing layer (7) is fixedly connected to multiple lower sensor communication contacts (502) that are corresponding to the upper sensor communication contact (501). The lower end of the conductive strip (8) extends through the upper sensor communication contact (501) into the oil-absorbing fixing layer (7) and is fixedly connected to the lower sensor communication contact (502). The input terminal of the constant conduction module is connected to the upper induction contact (501) via a wire. When the conduction bar (8) is in the complete state, the upper induction contact (501) maintains a constant conduction state. When the conduction bar (8) is located in the oil absorption fixing layer (7) and the transformer oil is absorbed and dispersed in the oil absorption fixing layer (7), the upper induction contact (501) switches to disconnection, so as to facilitate the constant conduction module to sense the sealing state. The upper end of the sealing ring groove (202) is provided with a plurality of pre-positioning grooves (203) corresponding to the positions of the pre-fixing member (4), and the pre-fixing member (4) is set in the corresponding pre-positioning groove (203). The pre-fixing member (4) is a semi-fluid gel material and is made by mixing white glue, liquid glue and baking soda in a certain proportion.

2. The leak-proof oil-immersed transformer according to claim 1, characterized in that, The conductive strip (8) is made of graphite powder by pressure pressing, and the particle size of the graphite powder is smaller than the fiber gap of the oil-absorbing fixing layer (7).

3. A leak-proof oil-immersed transformer according to claim 1, characterized in that, The sensor display (5) has a fixed flash lamp bead installed inside. The output end of the penetration warning unit is connected to the flash lamp bead signal through a wire. After the upper sensor connection contact (501) is disconnected, the electrical signal of the flash lamp bead is connected.

4. A leak-proof oil-immersed transformer according to claim 1, characterized in that, The oil-absorbing fixing layer (7) is made of oil-absorbing fiber, and the oil-absorbing fixing layer (7) cooperates with the guide strip (8) through the preset groove opened at its upper end.

5. A leak-proof oil-immersed transformer according to claim 1, characterized in that, The pre-fixed member (4) has a connecting induction groove (401) at its lower end, and the pre-fixed member (4) is bonded to the oil-absorbing fixing layer (7) through the connecting induction groove (401).

6. A self-inspection method for the sealing of a leak-proof oil-immersed transformer, based on the leak-proof oil-immersed transformer as described in claim 1, characterized in that, Includes the following steps: S1. Pre-fixation, S11. First, insert the mounting bolt (6) through the upper end of the oil tank cover (201), and fix the pre-fixed part (4) in the pre-positioning groove (203) by the action of the oil absorption fixing layer (7); S12. By pulling up the mounting bolt (6), the oil-absorbing fixing layer (7) is driven to generate a squeezing force on the pre-fixed part (4). Then, the mounting nut (601) is screwed onto the outer end of the mounting bolt (6) from the upper end of the oil tank cover (201) to fix the pre-fixed part (4) in the pre-positioning groove (203) and cause the outer side of the pre-fixed part (4) to undergo overflow deformation under the squeezing action of the oil-absorbing fixing layer (7). S13. Press the seal (3) into the sealing ring groove (202) and set the connection of the seal (3) in the pre-fixed part (4). The pre-fixed part (4) is squeezed out of the pre-fixed part (4) by the seal (3) to form a wrapping effect on the connection of the seal (3) and to bond and fix it. S2. Install the components, and install the transformer components inside the tank shell (2); S3. Tighten the seal. Finally, fix the pre-sealed tank cover (201) to the upper end of the tank shell (2) with fasteners, and make the lower end of the seal (3) squeeze and snap into the groove at the upper end of the tank shell (2). S4. Seal self-test: Connect the sealing leakage sensing unit and, based on the status of the sensing display (5), perform a seal connection self-test on the sealing status of the tank shell (2) and the tank cover (201) at this time. After the test is qualified, put the transformer body (1) into use.

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