An oil-immersed three-dimensional wound core transformer

Abstract

The utility model relates to the technical field of transformers, and specifically to an oil-immersed three-dimensional wound core transformer. The oil-immersed three-dimensional wound core transformer comprises a transformer box, a high-voltage bushing, a low-voltage bushing, an automatic fire extinguisher, an automatic fire extinguisher bracket, and a smoke sensing controller. The automatic fire extinguisher bracket is provided with a fire extinguishing nozzle, and the fire extinguishing nozzle is arranged along the horizontal arrangement direction of the high-voltage bushing and the low-voltage bushing toward the high-voltage bushing and the low-voltage bushing. When the high-voltage bushing and the low-voltage bushing of the transformer catch fire, the smoke sensing controller sounds an alarm and controls the fire extinguishing nozzle, and the fire extinguishing agent is sprayed through the fire extinguishing nozzle, which will isolate the oxygen around the high-voltage bushing and the low-voltage bushing, and quickly spray out the fire point, thereby solving the problem of poor fire extinguishing effect of the oil-immersed transformer fire extinguishing device in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to an oil-immersed three-dimensional wound core transformer. Background Art

[0002] Oil-immersed transformer is a kind of power equipment that uses oil as the main insulation means of the transformer to convert electric energy from one voltage level to another voltage level. It is used to adjust the power supply voltage, load balancing, power conversion, isolation, voltage stabilization, etc. It is mainly composed of iron core, winding, oil tank, cooling equipment, etc. The working principle of oil-immersed transformer is: there are two or more windings wound on the iron core of the transformer, which are connected to different power systems. When the main winding is connected to the power supply voltage, the magnetic field in the transformer will change, thereby inducing an electric potential in the secondary winding, thereby realizing the voltage transformation function.

[0003] The oil-immersed three-dimensional wound core transformer uses a three-dimensional winding method to connect multiple cores and coils together through different magnetic circuits. Some oil-immersed three-dimensional wound core transformers with oil pillows first inject transformer oil into the oil pillow, and then introduce high voltage electricity into the winding on the core through the high-voltage bushing, thereby converting high voltage electricity into low voltage, and finally conducting low voltage electricity through the low-voltage bushing. At present, when the oil-immersed three-dimensional wound core transformer is working, the transformer is prone to oil leakage due to aging of the transformer seals, cracking of welds, etc.; due to oil leakage, damage to the internal coil of the transformer, overload of electrical equipment, damage to the core insulation, and electric sparks generated by lightning strikes on the transformer, the high and low voltage bushings of the transformer are prone to catch fire. If the fire cannot be extinguished immediately after the fire, it will cause a major safety accident.

[0004] In order to solve the problem that the fire of the transformer cannot be extinguished immediately after it is caught on fire, a Chinese utility model patent with the authorization announcement number CN205656950U and the authorization announcement date October 19, 2016 discloses an electric oil-immersed transformer with a fire extinguishing function, which includes an automatic dust fire extinguisher, an automatic dust fire extinguisher bracket, an open flame sensing controller, an oil tank base, a wire, a high-voltage bushing, and a low-voltage bushing. The automatic dust fire extinguisher bracket is installed above the oil tank base, the automatic dust fire extinguisher is arranged above the automatic dust fire extinguisher bracket, a high-voltage bushing is arranged below the automatic dust fire extinguisher, a low-voltage bushing is arranged next to the high-voltage bushing, and the open flame sensing controller is arranged below the automatic dust fire extinguisher bracket, and the open flame sensing controller is connected to the automatic dust fire extinguisher through a wire. When the electric oil-immersed transformer catches fire, the open flame sensing controller senses that there is an open flame on the electric oil-immersed transformer, and the automatic dust fire extinguisher will release dust to extinguish the fire, thereby avoiding the occurrence of fire accidents.

[0005] The electric oil-immersed transformer with fire extinguishing function provided by the above utility model can extinguish the fire point of the oil-immersed transformer, but it does not explain the position distribution of the automatic fire extinguisher nozzle, and there are problems such as limited fire extinguishing range and poor fire extinguishing effect. In addition, its open flame sensing controller is close to the fire point. When the transformer catches fire, the open flame sensing controller and its connecting wires are easily burned, thereby causing the transformer fire extinguishing device to fail. Utility Model Content

[0006] The utility model aims to provide an oil-immersed three-dimensional wound core transformer to solve the problem of poor fire extinguishing effect of the oil-immersed transformer fire extinguishing device in the prior art.

[0007] In order to achieve the above purpose, the oil-immersed three-dimensional wound core transformer of the utility model adopts the following technical solutions:

[0008] An oil-immersed three-dimensional wound core transformer comprises a transformer box, a high-voltage bushing, a low-voltage bushing, an automatic fire extinguisher, an automatic fire extinguisher bracket, and a smoke sensor controller. The automatic fire extinguisher bracket is provided with a fire extinguishing nozzle, and the fire extinguishing nozzle is arranged toward the high-voltage bushing and the low-voltage bushing along the lateral arrangement direction of the high-voltage bushing and the low-voltage bushing.

[0009] Beneficial effects: The oil-immersed three-dimensional wound core transformer of the utility model is an improved invention. Specifically, by arranging the automatic fire extinguisher nozzles along the horizontal arrangement direction of the high-voltage bushing and the low-voltage bushing toward the high-voltage bushing and the low-voltage bushing, when the high-voltage bushing and the low-voltage bushing of the transformer catch fire, the smoke sensor controller sounds an alarm and controls the fire extinguisher nozzles, and the fire extinguishing agent is sprayed through the fire extinguisher nozzles, which will isolate the oxygen around the high-voltage bushing and the low-voltage bushing, and quickly spray out the fire point, thereby solving the problem of poor fire extinguishing effect of the oil-immersed transformer fire extinguishing device in the prior art.

[0010] Furthermore, the automatic fire extinguisher bracket includes a crossbeam located above the high-pressure bushing and the low-pressure bushing respectively, the crossbeam is connected to the transformer box through a column, and the fire extinguishing nozzle is arranged on the corresponding crossbeam.

[0011] Furthermore, the crossbeam is correspondingly located directly above the high-pressure bushing and the low-pressure bushing, and the nozzle of the fire-extinguishing nozzle faces downward.

[0012] Furthermore, the cross beams are connected together by at least one longitudinal beam connected therebetween.

[0013] Furthermore, the longitudinal beams and the transverse beams form a rectangular frame structure.

[0014] Furthermore, the column is connected to the bottom of the transformer box.

[0015] Furthermore, the smoke sensor controller includes a sensing part and a control part, and the sensing part is closer to the fire risk point than the control part.

[0016] Furthermore, the sensing part is located on the inner side of the automatic fire extinguisher bracket, and the control part is located on the outer side of the automatic fire extinguisher bracket.

[0017] Furthermore, the automatic fire extinguisher is a gas fire extinguisher.

[0018] Furthermore, an oil receiving tank is installed at the bottom of the transformer box. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of an embodiment of an oil-immersed three-dimensional wound core transformer of the utility model.

[0020] In the figure: 1. Transformer; 2. Transformer box; 3. Automatic fire extinguisher bracket; 4. High-voltage bushing; 5. Low-voltage bushing; 6. Oil receiving tank; 61. Oil pillow; 201. Fire extinguisher nozzle; 202. Single chip microcomputer; 203. Smoke sensor; 301. Crossbeam; 302. Column; 303. Longitudinal beam. DETAILED DESCRIPTION

[0021] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0022] An electric oil-immersed transformer with a fire extinguishing function disclosed in the prior art can extinguish the fire point of the oil-immersed transformer, but it does not explain the position distribution of the automatic fire extinguisher nozzle, and there are problems such as limited fire extinguishing range and poor fire extinguishing effect. In addition, its open flame sensing controller is close to the fire point. When the transformer catches fire, it is easy to burn the open flame sensing controller and its connecting wires, thereby causing the fire extinguishing device to fail. In view of the above problems, the utility model designs an oil-immersed three-dimensional wound core transformer. The core concept of this solution is to arrange the fire extinguishing nozzle along the horizontal arrangement direction of the high-voltage bushing and the low-voltage bushing towards the high-voltage bushing and the low-voltage bushing. When the transformer catches fire, the fire extinguishing agent can completely cover the fire points of the high-voltage bushing and the low-voltage bushing, isolating the surrounding oxygen to achieve rapid fire extinguishing.

[0023] Based on the above invention concept, Figure 1 As shown, an oil-immersed three-dimensional wound core transformer of the utility model includes a transformer box 2, a high-voltage bushing 4, a low-voltage bushing 5, an automatic fire extinguisher, an automatic fire extinguisher bracket 3, and a smoke sensor controller. The automatic fire extinguisher bracket 3 is provided with a fire extinguishing nozzle 201, and the fire extinguishing nozzle 201 is arranged toward the high-voltage bushing 4 and the low-voltage bushing 5 along the lateral arrangement direction of the high-voltage bushing 4 and the low-voltage bushing 5.

[0024] Among the above components, the automatic fire extinguisher bracket 3 includes a crossbeam 301 located above the high-voltage bushing 4 and the low-voltage bushing 5, respectively. The crossbeam 301 is connected to the transformer box 2 through a column 302. Figure 1 In the embodiment shown, the crossbeam 301 is located directly above the high-voltage bushing 4 and the low-voltage bushing 5. The length of the crossbeam 301 is greater than the length of the transformer box 2, and can completely cover the high-voltage bushing 4 and the low-voltage bushing 5. The column 302 is an L-shaped column, and its lower end is connected to the end of the lower surface of the transformer box 2, which can make the entire automatic fire extinguisher bracket 3 more stable and protect the transformer 1. In some other embodiments, its lower end is connected to the end of the upper surface of the transformer box 2. The height of the column 302 is higher than the oil pillow 61, so that the automatic fire extinguisher bracket 3 can completely cover the entire transformer 1. In specific use, for a transformer without an oil pillow 61, the height of the column 302 is higher than the transformer box 2. In order to make the entire automatic fire extinguisher bracket 3 more stable and reduce its pressure on the transformer box 2, the column 302 is preferably 4. In some embodiments, the column 302 can also be set to 2 or more than 4, so that the automatic fire extinguisher bracket 3 can be stabilized on the transformer box 2 to ensure that it does not shake. Considering the stability of the entire automatic fire extinguisher bracket 3, the cross beams 301 are connected together by at least one longitudinal beam 303 connected therebetween. Figure 1 In the illustrated embodiment, the ends of the cross beam 301 are connected to two longitudinal beams 303 , and the longitudinal beams 303 and the cross beam 301 form a rectangular frame structure. In some other embodiments, one longitudinal beam 303 may be provided in the middle of the cross beam 301 , or multiple longitudinal beams 303 may be provided without particular limitation.

[0025] Fire extinguishing nozzles 201 are provided on the crossbeams above the high-pressure bushing 4 and the low-pressure bushing 5, and are arranged toward the high-pressure bushing 4 and the low-pressure bushing 5 along the lateral arrangement direction of the high-pressure bushing 4 and the low-pressure bushing 5. Figure 1 In the illustrated embodiment, the fire extinguishing nozzle 201 is disposed directly below the cross beam 301 with the nozzle facing downward, which can protect the fire extinguishing nozzle 201 from wind erosion and damage, thereby achieving a better fire extinguishing effect. Considering that the automatic fire extinguisher can quickly extinguish a fire and save fire extinguishing agent, multiple fire extinguishing nozzles 201 are arranged evenly in a row. In some other embodiments, the fire extinguishing nozzles 201 may also be arranged unevenly, as long as the ejected gaseous fire extinguishing agent can cover the surrounding area of ​​the transformer 1. The fire extinguishing nozzles 201 may also be disposed on the inner side or outer side of the cross beam 301.

[0026] The automatic fire extinguisher is a gas fire extinguisher, which is connected to the fire extinguishing nozzle 201. Figure 1In the embodiment shown, due to the special properties of the oil-immersed transformer, heptafluoropropane, which can spray out flammable liquids, is preferably used as a gas fire extinguishing agent. It is a colorless, odorless, non-conductive, insulating, and non-secondary polluting gas. It can extinguish the inert gas layer formed by the flame through chemical reactions, isolate oxygen to achieve the fire extinguishing effect, and heptafluoropropane does not damage the transformer and does not affect the subsequent use of the transformer. In other embodiments, other gas fire extinguishing agents can also be selected, such as inert gas fire extinguishing agent IGS41, CO2 gas fire extinguishing agent, etc., which are harmless to the human body and do not pollute the environment, and are suitable for high-voltage electricity and oil fire extinguishing.

[0027] The smoke sensor controller consists of a sensing part and a control part. The sensing part is closer to the fire risk point than the control part. Figure 1 In the embodiment shown, the sensing part is a smoke sensor 203, which is arranged on the inner side of the column 302. When the transformer 1 catches fire, the smoke sensor 203 can quickly sense it and send out an alarm. In some embodiments, it can also be arranged on other sides of the column 302. The control part is a single-chip microcomputer 202, which can be remotely managed, receive the sensing data of the smoke sensor 203 in real time, and intelligently control the fire extinguishing nozzle 201 to achieve automatic and timely fire extinguishing, providing guarantee for the safe and stable operation of the entire fire extinguishing device. The single-chip microcomputer 202 is arranged on the outer side of the column 302, and the input end of the single-chip microcomputer 202 is connected to an external power supply. In some embodiments, the single-chip microcomputer 202 can also be arranged on other columns 302, or on other sides of the column 302. The control part can also be a PLC or a microcontroller.

[0028] exist Figure 1 In the illustrated embodiment, an oil collecting tank 6 is installed at the bottom of the transformer box 2, which can store the oil leaked during the operation of the transformer 1 and reduce the ignition point of the transformer 1. To facilitate the pouring of oil, the oil receiver 6 is preferably a drawer-type structure. In some other embodiments, the oil collecting tank 6 can also be set to a funnel shape, and an oil pipe is connected to the funnel mouth to discharge the leaked oil.

[0029] When using the device, first assemble the automatic fire extinguisher bracket 3, then connect its column 302 to the transformer box 2, evenly install the fire extinguishing nozzle 201 on the crossbeam 301, then install the single-chip computer 202 and the smoke sensor 203 on the column 302, then connect the nozzle 201 to the external heptafluoropropane, and connect the input end of the single-chip computer 202 to the external power supply. When the transformer 1 catches fire, the smoke sensor 203 sounds an alarm, and the smoke sensor 203 transmits the real-time sensed data to the single-chip computer 202, and the single-chip computer 202 controls the fire extinguishing nozzle 201 to spray the externally connected heptafluoropropane through the fire extinguishing nozzle 201 to extinguish the fire source, thereby realizing rapid fire extinguishing.

Claims

1. An oil-immersed three-dimensional wound core transformer, comprising a transformer box, a high-voltage bushing, a low-voltage bushing, an automatic fire extinguisher, an automatic fire extinguisher bracket, and a smoke sensor controller, wherein the automatic fire extinguisher bracket is provided with a fire extinguishing nozzle, characterized in that: The fire extinguishing nozzle is arranged along the transverse arrangement direction of the high-pressure bushing and the low-pressure bushing towards the high-pressure bushing and the low-pressure bushing.

2. The oil-immersed three-dimensional wound core transformer according to claim 1, characterized in that: The automatic fire extinguisher bracket includes a crossbeam located above the high-voltage bushing and the low-voltage bushing respectively, the crossbeam is connected to the transformer box through a column, and the fire extinguishing nozzle is arranged on the corresponding crossbeam.

3. The oil-immersed three-dimensional wound core transformer according to claim 2, characterized in that: The crossbeam is correspondingly located directly above the high-pressure bushing and the low-pressure bushing, and the nozzle of the fire-extinguishing nozzle faces downward.

4. The oil-immersed three-dimensional wound core transformer according to claim 2, characterized in that: The cross beams are connected together by at least one longitudinal beam connected therebetween.

5. The oil-immersed three-dimensional wound core transformer according to claim 4, characterized in that: The longitudinal beams and the transverse beams form a rectangular frame structure.

6. The oil-immersed three-dimensional wound core transformer according to claim 2, characterized in that: The column is connected to the bottom of the transformer box.

7. The oil-immersed three-dimensional wound core transformer according to claim 1, characterized in that: The smoke sensor controller comprises a sensing part and a control part, wherein the sensing part is closer to the fire risk point than the control part.

8. The oil-immersed three-dimensional wound core transformer according to claim 7, characterized in that: The sensing part is located on the inner side of the automatic fire extinguisher bracket, and the control part is located on the outer side of the automatic fire extinguisher bracket.

9. The oil-immersed three-dimensional wound core transformer according to claim 1, characterized in that: The automatic fire extinguisher is a gas fire extinguisher.

10. The oil-immersed three-dimensional wound core transformer according to claim 1, characterized in that: An oil receiving tank is installed at the bottom of the transformer box.

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