A highly secure, fully sealed distribution transformer

Abstract

This utility model discloses a highly safe, fully sealed distribution transformer, including an oil tank, a tank cover, an iron core, windings, high-voltage ceramic insulating bushings, low-voltage ceramic insulating bushings, an oil storage pipe, a breather, and an explosion-proof device. Multiple elastic ribs protrude from the outer walls of the oil tank, and each elastic rib has a retractable receiving groove on its inner side. The tank cover is tightly fitted over the upper part of the oil tank. The iron core and windings are housed inside the oil tank, which is filled with insulating mineral oil. The high-voltage and low-voltage ceramic insulating bushings are respectively installed on the upper wall of the tank cover and are electrically connected to the windings. The oil storage pipe and the explosion-proof device are respectively installed on the upper wall of the tank cover, and the oil storage pipe is connected to the oil tank. The breather is located at the upper end of the oil storage pipe. This utility model's technical solution effectively enhances the safety of the transformer and extends its service life.

Description

Technical Field

[0001] This utility model relates to the field of power transformer technology, and in particular to a fully sealed distribution transformer with high safety. Background Technology

[0002] Distribution transformers are one of the important pieces of equipment in the power supply and distribution systems of industrial and mining enterprises and civil buildings. They reduce the 10 (6) kV or 35 kV network voltage to the 230 / 400 V bus voltage used by users.

[0003] However, currently available oil-immersed distribution transformers store insulating oil and cooling oil. When the oil temperature changes, the oil volume also changes accordingly, resulting in pressure changes inside the tank. The pressure inside the tank always increases with rising temperature or an increase in the amount of oil in the transformer. If no measures are taken to balance the pressure, the transformer tank may be damaged. The oil in the transformer will be affected by heat and pressure, and will oxidize, producing air and forming bubbles. When the transformer operates for a long time, more and more gas accumulates inside. If it is not released in time, the tank may explode, affecting the transformer's service life and operational safety. Utility Model Content

[0004] The main objective of this invention is to propose a fully sealed distribution transformer with high safety, aiming to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model proposes a highly safe, fully sealed distribution transformer, comprising an oil tank, a tank cover, an iron core, windings, a high-voltage ceramic insulating bushing, a low-voltage ceramic insulating bushing, an oil storage pipe, a breather, and an explosion-proof safety valve. Multiple elastic ribs protrude from the outer walls of the oil tank, and each elastic rib has a retractable receiving groove on its inner side. The tank cover is tightly fitted over the upper end of the oil tank. The iron core and windings are housed inside the oil tank, which is filled with insulating mineral oil. The high-voltage and low-voltage ceramic insulating bushings are respectively installed on the upper wall of the tank cover and are electrically connected to the windings. The oil storage pipe and the explosion-proof safety valve are respectively installed on the upper wall of the tank cover, and the oil storage pipe is connected to the oil tank. The breather is located at the upper end of the oil storage pipe.

[0006] Optionally, it also includes a pressure, temperature and oil level detection device, which is installed on the tank cover and has a wireless communication module inside.

[0007] Optionally, the upper wall of the tank cover is provided with a filling valve, and the lower end of the tank is provided with a drain valve.

[0008] Optionally, it also includes a base, a roller bracket, and a roller. The base is respectively disposed on both sides of the lower bottom wall of the oil tank, the roller bracket is rotatably disposed at both ends of the base, and the roller is rotatably disposed at the lower end of the roller bracket.

[0009] Optionally, it also includes a first limiting bolt. The upper end of the roller bracket is rotatably connected to the base through a short shaft. The two ends of the base are respectively provided with a plurality of first threaded holes in a cross shape. The first limiting bolt is screwed into the first threaded hole. The upper end wall of the roller bracket is provided with a first limiting hole. The lower end of the first limiting bolt can be embedded in the first limiting hole.

[0010] Optionally, it also includes a second limiting bolt. The two side walls of the roller bracket are provided with second threaded holes opposite each other. The side wall of the roller is recessed with a plurality of second limiting holes. The second limiting bolt passes through the second limiting holes and is screwed into the second threaded holes.

[0011] Optionally, it also includes lifting rings, which are respectively disposed at both ends of the upper wall of the box cover.

[0012] The technical solution of this utility model has the following beneficial effects: The technical solution of this utility model, by setting elastic ribs around the oil tank, has a dual function: cooling the oil tank through its surface facilitates rapid heat dissipation; and the ribs expand or contract due to changes in the oil volume (expansion or contraction). Simultaneously, when the insulating mineral oil changes volume due to thermal expansion and contraction, the oil storage pipe can respond flexibly: when the oil expands due to heat, it flows into the oil storage pipe; when the oil contracts due to cold, it flows back into the oil tank, effectively performing the functions of oil storage and replenishment. This ensures that the oil tank is always full of oil, and the iron core and windings are always immersed in oil. The breather at the upper end of the oil storage pipe allows the space above the oil storage pipe to communicate with the atmosphere, thus ensuring the free flow of transformer oil during thermal expansion and contraction. When the pressure inside the oil tank exceeds a preset value, the sealing door (valve) of the explosion-proof safety valve will be opened, thereby releasing gas and reducing pressure. Once the pressure decreases, the sealing door will automatically close under spring pressure. The explosion-proof safety valve automatically opens to release pressure when the internal pressure of the transformer exceeds a set value, balancing the pressure inside and outside the tank and preventing tank rupture or component damage due to abnormal pressure, thus preventing tank explosion. This not only effectively prevents tank deformation or damage but also further enhances transformer safety and extends its service life. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of a fully sealed distribution transformer with high safety according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of a highly secure, fully sealed distribution transformer according to an embodiment of the present invention, from another perspective. Figure 3 This is a partial structural diagram of a fully sealed distribution transformer with high safety according to an embodiment of the present invention; Figure 4 This is a partially exploded structural diagram of a fully sealed distribution transformer with high safety according to an embodiment of the present invention.

[0015] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0018] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0019] This utility model proposes a fully sealed distribution transformer with high safety.

[0020] like Figures 1 to 4As shown, in one embodiment of this utility model, the highly safe, fully sealed distribution transformer includes an oil tank 101, a tank cover 102, an iron core (not shown), windings (not shown), a high-voltage ceramic insulating bushing 103, a low-voltage ceramic insulating bushing 104, an oil storage pipe 105, a breather 106, and an explosion-proof safety valve 107. Multiple elastic ribs 1011 protrude from the outer walls of the oil tank 101, and each elastic rib 1011 has a retractable receiving groove 1012 on its inner side. The tank cover 102 completely covers the oil tank. At the upper end of the housing 101, the iron core and winding are located inside the oil tank 101, which is filled with insulating mineral oil. The high-voltage ceramic insulating bushing 103 and the low-voltage ceramic insulating bushing 104 are respectively located on the upper wall of the housing cover 101. The high-voltage ceramic insulating bushing 103 and the low-voltage ceramic insulating bushing 104 are electrically connected to the winding. The oil storage pipe 105 and the explosion-proof safety valve 107 are respectively located on the upper wall of the housing cover 102. The oil storage pipe 105 is connected to the oil tank 101. The breather 106 is located at the upper end of the oil storage pipe 105.

[0021] Specifically, it also includes a pressure, temperature and oil level detection device 108, which is installed on the tank cover 102. The pressure, temperature and oil level detection device 108 is equipped with a wireless communication module, which can detect the oil level, oil temperature and pressure in the oil tank in real time and upload them to the cloud storage server in real time. This helps to maintain the pressure, temperature and level of oil and gas within the allowable range, ensuring the reliable and safe operation of the transformer.

[0022] Specifically, the upper wall of the tank cover 102 is provided with an oil filling valve 109, and the lower end of the oil tank 101 is provided with an oil drain valve 110, which facilitates the addition and discharge of insulating mineral oil into the transformer oil tank.

[0023] Specifically, it also includes a base 111, a roller bracket 112, and a roller 113. The base 111 is respectively disposed on both sides of the lower bottom wall of the oil tank 101. The roller bracket 112 is rotatably disposed at both ends of the base 111. The roller 113 is rotatably disposed at the lower end of the roller bracket 112. The rollers make the transformer move more conveniently and quickly, saving time and effort.

[0024] Specifically, it also includes a first limiting bolt 114. The upper end of the roller bracket 112 is rotatably connected to the base 111 through a short shaft. The two ends of the base 111 are respectively provided with a plurality of cross-shaped symmetrical first threaded holes 1111. The first limiting bolt 114 is screwed into the first threaded holes 1111. The upper end wall of the roller bracket 112 is provided with a first limiting hole 1121. The lower end of the first limiting bolt 114 can be embedded in the first limiting hole 1121. The position of the roller bracket can be locked by the first limiting bolt, thereby locking the direction of the roller and preventing the transformer from moving.

[0025] Specifically, it also includes a second limiting bolt 115. The two side walls of the roller bracket 112 are provided with second threaded holes 1122 opposite to each other. The side wall of the roller 113 is recessed with multiple second limiting holes 1131. The second limiting bolt 115 passes through the second limiting hole 1131 and is screwed into the second threaded hole 1122. The roller can be locked by the second limiting bolt to prevent the transformer from moving.

[0026] Specifically, it also includes lifting rings 116, which are respectively set at both ends of the upper wall of the box cover 102 to facilitate the transportation and hoisting of the transformer.

[0027] Specifically, the working principle of this utility model is as follows: This invention features elastic ribs around the oil tank, serving a dual purpose: firstly, the ribs cool the tank via their surface, facilitating rapid heat dissipation; secondly, the ribs expand or contract as the oil volume changes, and thirdly, the oil storage pipe adapts flexibly to changes in the volume of the insulating mineral oil due to thermal expansion and contraction: oil flows into the storage pipe when it expands and returns to the tank when it contracts, effectively fulfilling both storage and replenishment functions. This ensures the tank remains full of oil, and the core and windings are always immersed in it. A breather at the upper end of the storage pipe allows the space above the pipe to communicate with the atmosphere, ensuring free flow of transformer oil during thermal expansion and contraction. Finally, when the pressure inside the tank exceeds a preset value, the explosion-proof safety valve's sealing gate (valve) is opened, releasing gas and reducing pressure. Once the pressure decreases, the sealing door will automatically close under spring pressure. The explosion-proof safety valve automatically opens to release pressure when the internal pressure of the transformer exceeds a set value, balancing the pressure inside and outside the tank and preventing tank rupture or component damage due to abnormal pressure, thus preventing tank explosion. This not only effectively prevents tank deformation or damage but also further enhances transformer safety and extends its service life.

[0028] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A fully sealed distribution transformer with high safety, characterized in that, The system includes an oil tank, a cover, an iron core, windings, a high-voltage ceramic insulating bushing, a low-voltage ceramic insulating bushing, an oil storage pipe, a breather, and an explosion-proof safety valve. Multiple elastic ribs protrude from the outer walls of the oil tank, and each elastic rib has a retractable receiving groove on its inner side. The cover is tightly fitted over the upper part of the oil tank. The iron core and windings are housed inside the oil tank, which is filled with insulating mineral oil. The high-voltage and low-voltage ceramic insulating bushings are respectively mounted on the upper wall of the cover and are electrically connected to the windings. The oil storage pipe and explosion-proof safety valve are respectively mounted on the upper wall of the cover and are connected to the oil tank. The breather is located at the upper end of the oil storage pipe.

2. The fully sealed distribution transformer with high safety according to claim 1, characterized in that, It also includes a pressure, temperature and oil level detection device, which is installed on the tank cover and has a wireless communication module inside.

3. The fully sealed distribution transformer with high safety according to claim 1, characterized in that, The upper wall of the tank cover is provided with a filling valve, and the lower end of the tank is provided with a drain valve.

4. The fully sealed distribution transformer with high safety according to claim 1, characterized in that, It also includes a base, a roller bracket, and rollers. The base is respectively disposed on both sides of the lower bottom wall of the oil tank. The roller bracket is rotatably disposed at both ends of the base. The roller is rotatably disposed at the lower end of the roller bracket.

5. The fully sealed distribution transformer with high safety according to claim 4, characterized in that, It also includes a first limiting bolt. The upper end of the roller bracket is rotatably connected to the base through a short shaft. The two ends of the base are respectively provided with a plurality of first threaded holes in a cross shape. The first limiting bolt is screwed into the first threaded hole. The upper end wall of the roller bracket is provided with a first limiting hole. The lower end of the first limiting bolt can be embedded in the first limiting hole.

6. The fully sealed distribution transformer with high safety according to claim 4, characterized in that, It also includes a second limiting bolt. The two side walls of the roller bracket are provided with second threaded holes opposite each other. The side wall of the roller is recessed with a plurality of second limiting holes. The second limiting bolt passes through the second limiting hole and is screwed into the second threaded hole.

7. The fully sealed distribution transformer with high safety according to claim 1, characterized in that, It also includes lifting rings, which are respectively disposed at both ends of the upper wall of the box cover.

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