Power transformer
By designing automatic shading and flame retardant systems in power transformers, the problem of insulating oil overflow during the deflagation of the transformer is solved, reducing fire spread and loss, and improving safety.
Patent Information
- Application Number
- CN202510213624.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2025-05-27
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Large transformers are prone to deflagration when they are aging or malfunctioning, and the insulation oil overflows and contacts with open flames, resulting in serious injury and loss.
A power transformer is designed, including multiple heat dissipation fins, heat-expanded liquid in glass tubes, sandboxes and liquid storage tanks. Through these components, the insulating oil spills automatically blocks the overflow of insulating oil when a deflagration occurs, reducing the spread of fire.
It effectively reduces the loss of insulating oil spill after the transformer deflagration, reduces the harm to the surrounding environment and personnel, and improves safety.
Smart Images
Figure CN120048618A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of transformers, and in particular to a power transformer. Background Art
[0002] A power transformer mainly consists of an iron core, windings, an oil tank, insulating parts, a tap changer, a protection device, etc. For some large transformers, due to severe heat generation, insulating oil needs to be added inside the transformer to dissipate heat from the windings. However, as the transformer ages or malfunctions, there is an easy occurrence of the deflagration phenomenon of the transformer. The insulating oil expands and overflows when heated, and the insulating oil catches fire spontaneously when encountering an open flame, causing serious harm to the surrounding personnel and objects. Therefore, a power transformer with a protection function is needed to further reduce the losses caused after the deflagration of the transformer. Summary of the Invention
[0003] In view of this, the technical problem to be solved by the present invention is to provide a power transformer. The power transformer of the present invention has a protection function and can block the overflowing insulating oil, further reducing the losses caused after deflagration.
[0004] A power transformer includes a box body. Windings are installed inside the box body and are immersed in insulating oil. A plurality of heat dissipation fins are fixedly connected to the surface of the box body. A glass tube is fixedly connected to the upper end of the box body. A heat-expandable liquid is contained in the glass tube. A pressing plate is fixedly connected to the upper end of the glass tube. A pull rod is fixedly connected to the upper end of the pressing plate. A fixing frame is fixedly connected to the upper end of the box body. The pull rod is slidably connected to the fixing frame. A blocking piece is fixedly connected to the end of the pull rod. A spring is sleeved on the pull rod, and the spring is located between the blocking piece and the fixing frame. Guard plates are rotatably connected to the front and rear ends of the box body, and contact plates are fixedly connected to both guard plates.
[0005] A plurality of flow guiding strips are fixedly connected to one side of each of the two guard plates.
[0006] A plurality of sand storage boxes are fixedly connected to the upper end of the box body, and each sand storage box is provided with an opening.
[0007] Baffle plates are fixedly connected to both of the two guard plates, and the baffle plates can block the openings on the same side.
[0008] A liquid storage tank is fixedly connected to the upper end of the fixing frame. The blocking piece is slidably connected to the liquid storage tank. Two shunt tubes are fixedly connected to the liquid storage tank. Two nozzles are fixedly connected to the lower ends of both shunt tubes, and the two nozzles are respectively aligned with the two openings on the same side.
[0009] A liquid inlet pipe is fixedly connected to the upper end of the liquid storage tank, and a sealing plug is installed in the liquid inlet pipe.
[0010] The heat-expandable liquid is kerosene.
[0011] A rubber ring is provided at the edge of the blocking piece. Brief Description of the Drawings
[0012] The present invention will be further described in detail below with reference to the drawings and specific embodiments.
[0013] Figure 1 and Figure 2 is a schematic diagram of the overall structure of a power transformer;
[0014] Figure 3 is a schematic diagram of the structure of the guard plate;
[0015] Figure 4 is a schematic diagram of the structure of the diversion bar;
[0016] Figure 5 is a schematic diagram of the structure of the sand storage box;
[0017] Figure 6 is a schematic diagram of the structure of the heat dissipation fins;
[0018] Figure 7 is a schematic diagram of the structure of the glass tube;
[0019] Figure 8 is a schematic diagram of the structure of the baffle plate. Specific Embodiments
[0020] The present invention will be described in detail in combination with the drawings in the embodiments of the present invention.
[0021] Refer to Figure 3-8 ,
[0022] A power transformer includes a box body 101, a winding is installed in the box body 101, the winding is immersed in insulating oil, a plurality of heat dissipation fins 102 are fixedly connected to the surface of the box body 101, a glass tube 201 is fixedly connected to the upper end of the box body 101, a heat expansion liquid is contained in the glass tube 201, a pressing plate 202 is fixedly connected to the upper end of the glass tube 201 by bolts, a pull rod 204 is fixedly connected to the upper end of the pressing plate 202 by bolts, a fixing frame 203 is fixedly connected to the upper end of the box body 101 by bolts, the pull rod 204 is slidably connected to the fixing frame 203, a baffle plate 302 is fixedly connected to the end of the pull rod 204 by bolts, a spring 303 is sleeved on the pull rod 204, the spring 303 is located between the baffle plate 302 and the fixing frame 203, and guard plates 401 are rotatably connected to the front and rear ends of the box body 101, and contact plates 403 are welded to both of the two guard plates 401.
[0023] The winding of the transformer is immersed in insulating oil, and the insulating oil can play a role in dissipating heat from the winding during the operation of the transformer. The heat is transferred to the plurality of heat dissipation fins 102 on the surface of the box body 101, and then the plurality of heat dissipation fins 102 are used to dissipate the heat.
[0024] As the transformer generates heat during operation, the insulating oil in the box body 101 expands when heated, and then the insulating oil enters the auxiliary oil tank. However, as the transformer ages or malfunctions, the insulating oil may expand and leak, leading to a deflagration phenomenon in the transformer. At this time, the insulating oil will overflow, and when the insulating oil comes into contact with an open flame, it will catch fire naturally, causing damage to the transformer and the surrounding environment.
[0025] When this transformer is in normal use, the pressing plate 202 can press the two contact plates 403, so that the two guard plates 401 tilt upward, avoiding blocking multiple heat dissipation fins 102 and affecting the heat dissipation effect. If deflagration causes the insulating oil to overflow, the surrounding temperature will cause the liquid in the glass tube 201 to expand when heated, causing the glass tube 201 to break. At this time, the pressing plate 202 is no longer restricted, and the pressing plate 202 can move upward under the action of the spring 303. The pull rod 204 slides upward on the fixed frame 203, and the pressing plate 202 disengages from the two contact plates 403. The two guard plates 401 can rotate downward to the vertical state under their own weight, and then can block multiple heat dissipation fins 102 on the surface of the box body 101, so as to prevent the insulating oil from spraying out due to pressure, further reducing the damage range of the natural insulating oil to the surrounding environment and ensuring the safety of personnel or objects near the transformer.
[0026] See Figure 4 ,
[0027] A plurality of flow guide strips 402 are welded on one side of each of the two guard plates 401. The plurality of flow guide strips 402 play a role in guiding the insulating oil. When the two guard plates 401 are both in the vertical state, the insulating oil sprayed out from the transformer is blocked by the two guard plates 401 and can flow downward along the plurality of flow guide strips 402, further preventing the insulating oil from splashing everywhere and avoiding the spread of fire.
[0028] See Figure 5 ,
[0029] A plurality of sand storage boxes 103 are welded to the upper end of the box body 101, and each sand storage box 103 is provided with an opening 104.
[0030] Each sand storage box 103 contains sand, which is used to further reduce the fire. When the two guard plates 401 rotate to the vertical state, the sand in the plurality of sand storage boxes 103 flows out through the openings 104, so that the sand covers between the plurality of heat dissipation fins 102 on the surface of the box body 101 and the guard plates 401. After the sand comes into contact with the overflowing insulating oil, it can further prevent the insulating oil from catching fire naturally, thereby achieving the purpose of reducing the fire.
[0031] See Figure 1-4 ,
[0032] Two guard plates 401 are both welded with baffle plates 404, and the baffle plates 404 can block the openings 104 on the same side.
[0033] When both guard plates 401 are in an upwardly inclined state, the baffle plates 404 thereon can block the openings 104 on the same side, thereby avoiding the outflow of sand. When the two guard plates 401 rotate to the vertical state, the baffle plates 404 are separated from the openings 104, and then the sand in the sand storage box 103 can flow out automatically.
[0034] See Figure 5-8 ,
[0035] The upper end of the fixing frame 203 is fixedly connected with a liquid storage tank 301 by bolts. The baffle 302 is slidably connected in the liquid storage tank 301. Two shunt pipes 305 are welded on the liquid storage tank 301. Both lower ends of the two shunt pipes 305 are fixedly connected with two spray heads, and the two spray heads are respectively aligned with the two openings 104 on the same side.
[0036] When the glass tube 201 is broken and the pressing plate 202 moves upward, both guard plates 401 rotate to the vertical state. At the same time, the guard plate 401 drives the baffle 302 to slide upward in the liquid storage tank 301. The liquid storage tank 301 is filled with silicone flame retardant. The increased pressure in the liquid storage tank 301 causes the silicone flame retardant to be sprayed out through multiple spray heads. Then, while the sand flows out, the silicone flame retardant is evenly mixed with the sand, thereby further preventing the overflowing insulating oil from catching fire and improving the flame retardant effect.
[0037] See Figure 8 ,
[0038] The upper end of the liquid storage tank 301 is fixedly connected with a liquid inlet pipe 304, and a sealing plug is installed in the liquid inlet pipe 304.
[0039] After the liquid flame retardant in the liquid storage tank 301 is used up, the sealing plug is opened and the liquid flame retardant is filled into the liquid storage tank 301 through the liquid inlet pipe 304.
[0040] See Figure 7 ,
[0041] The heat-expanded liquid is kerosene, and the kerosene can burst the glass tube 201 within a certain temperature range.
[0042] See Figure 8 ,
[0043] A rubber ring is provided at the edge of the baffle 302, and the rubber ring has a good sealing effect.
[0044] See Figure 3 ,
[0045] The liquid storage tank 301 is filled with a liquid flame retardant, and the liquid flame retardant is convenient to be sprayed on the sand under pressure to ensure the flame retardant effect.
[0046] See Figure 1-2 ,
[0047] The lower end of the box body 101 is fixedly connected with an isolation box 105 through bolts. The isolation box 105 is used to receive the spilled insulating oil and sand, and avoid the insulating oil flowing on the ground and spreading around.
Claims
1. A power transformer, characterized in that: The invention comprises a box (101), a winding is installed in the box (101), the winding is immersed in insulating oil, a plurality of heat dissipation fins (102) are fixedly connected to the surface of the box (101), a glass tube (201) is fixedly connected to the upper end of the box (101), a liquid that expands when heated is contained in the glass tube (201), a pressing plate (202) is fixedly connected to the upper end of the glass tube (201), a pull rod (204) is fixedly connected to the upper end of the pressing plate (202), and the upper end of the box (101) is fixedly connected to the upper end of the box (101). The end of the box body (101) is fixedly connected to a fixing frame (203), the pull rod (204) is slidably connected to the fixing frame (203), the end of the pull rod (204) is fixedly connected to a blocking piece (302), a spring (303) is sleeved on the pull rod (204), and the spring (303) is located between the blocking piece (302) and the fixing frame (203), and the front and rear ends of the box body (101) are rotatably connected to guard plates (401), and the two guard plates (401) are fixedly connected to contact plates (403).
2. A power transformer according to claim 1, characterized in that: A plurality of guide strips (402) are fixedly connected to one side of each of the two guard plates (401).
3. A power transformer according to claim 2, characterized in that: A plurality of sand storage boxes (103) are fixedly connected to the upper end of the box body (101), and each sand storage box (103) is provided with an opening (104).
4. A power transformer according to claim 3, characterized in that: The two guard plates (401) are both fixedly connected with a baffle (404), and the baffle (404) can shield the opening (104) on the same side.
5. A power transformer according to claim 4, characterized in that: The upper end of the fixed frame (203) is fixedly connected to a liquid storage tank (301), the baffle (302) is slidably connected in the liquid storage tank (301), two shunt pipes (305) are fixedly connected to the liquid storage tank (301), and the lower ends of the two shunt pipes (305) are fixedly connected to two nozzles, and the two nozzles are respectively aligned with the two openings (104) on the same side.
6. A power transformer according to claim 5, characterized in that: The upper end of the liquid storage tank (301) is fixedly connected with a liquid inlet pipe (304), and a sealing plug is installed in the liquid inlet pipe (304).
7. A power transformer according to claim 1, characterized in that: The heat-expanding liquid is kerosene.
8. A power transformer according to claim 1, characterized in that: The edge of the baffle (302) is provided with a rubber ring.
9. A power transformer according to claim 1, characterized in that: The liquid storage tank (301) contains liquid flame retardant.
10. A power transformer according to claim 1, characterized in that: The lower end of the box body (101) is fixedly connected to an isolation box (105).