An implosion-proof power transformer

Abstract

The utility model relates to transformer technical field discloses a kind of anti-implosion power transformers, comprising: transformer voltage regulator switch and transformer body, the left side of the transformer body is equipped with transformer voltage regulator switch, the top of the transformer body is equipped with metal corrugated expansion absorber, the bottom of the metal corrugated expansion absorber is connected with transformer oil in the transformer body through communicating port. The anti-implosion power transformer, replace the original expensive air supplement device and dry type bushing, connect with transformer oil by multi-point dispersion opening strategy, effectively buffer implosion pressure and reduce manufacturing cost, at the same time, expansion absorber outside air isolation, inside transformer oil communication simplifies maintenance process, eliminates the dependence on frequent air supplement device, in addition, traditional gas relay is retained to realize the overall protection of light gas and heavy gas, early warning potential fault, significantly improve operation safety.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to an explosion-proof power transformer. Background Technology

[0002] In the field of electrical engineering and automation, especially in the manufacturing and operation and maintenance of power system equipment, the safe operation of power transformers is of paramount importance. As the core equipment for power transmission and distribution, the stability and safety of the internal structure of power transformers directly affect the reliable operation of the entire power system. However, in actual operation, power transformers may encounter severe internal faults, such as short circuits and arc discharges. These faults can rapidly generate enormous internal pressure, severely impacting the transformer tank and even leading to tank cracking, transformer oil leakage, or even fires, seriously threatening the safety of the power grid and the lives and property of personnel.

[0003] To address the above issues, various solutions for explosion-proof power transformers have been proposed in the existing technology, and the main measures include, but are not limited to: Eliminating the oil conservator and installing an air cushion layer: An air cushion layer is installed on top of the transformer, using nitrogen or other inert gases as a buffer material to absorb pressure shock waves generated during internal faults and prevent the oil tank from cracking. However, this solution requires the transformer to rely on a gas replenishment device to maintain internal pressure balance during normal operation. Maintenance-free gas replenishment devices are expensive, and the solution using compressed gas cylinders requires frequent cylinder replacements. The rate of cylinder consumption is affected by transformer load and local temperature fluctuations, resulting in high maintenance costs and inconvenience.

[0004] Dry bushings are used: the lower end of the dry bushing passes through the air cushion layer and connects to the transformer's output terminal, while the upper end extends out of the tank cover as the output terminal. Although dry bushings improve the explosion-proof performance of transformers to some extent, their price is generally higher, especially for high-voltage transformers (such as 110kV and above), where the cost increase is significant.

[0005] Quick-acting hydraulic relays replace gas relays: Heavy gas protection for transformers is achieved by using quick-acting hydraulic relays, but this solution cannot achieve light gas protection. That is, it can only provide early warning and cut off the power supply a few seconds before a transformer accident occurs, and cannot issue early warning signals days or weeks in advance like traditional gas relays.

[0006] Automatic gas replenishment device: An automatic gas replenishment device is installed near the transformer to regulate internal pressure changes. However, this solution also faces problems such as high cost and complex maintenance. In addition, the thermal conductivity of gas is not as good as that of transformer oil, which leads to heat accumulation in the upper layer (air cushion layer) of the transformer and reduces the overall heat dissipation efficiency.

[0007] For ease of understanding, please refer to the instruction manual. Figure 3The existing scheme structure diagram shown includes a transformer voltage regulating switch 1, a transformer body 2, a pressure relief valve 5, a long-tail dry bushing 16, an air cushion layer 17, a fast-acting hydraulic relay 18, and an online air cushion layer gas replenishment device.

[0008] In summary, although existing explosion-proof power transformer technologies have improved the explosion-proof capability of transformers to some extent, they still suffer from drawbacks such as high manufacturing costs, complex maintenance, insufficient gas protection functions, and reduced heat dissipation efficiency. Therefore, developing a power transformer that ensures explosion-proof capability while reducing manufacturing costs, simplifying maintenance procedures, and improving gas protection functions has become an urgent technical problem to be solved in the field of power system equipment manufacturing and operation and maintenance. Utility Model Content

[0009] The purpose of this invention is to provide an explosion-proof power transformer to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, this utility model provides the following technical solution: an explosion-proof power transformer, comprising: a transformer voltage regulating switch and a transformer body, wherein the transformer voltage regulating switch is provided on the left side of the transformer body, and a metal corrugated expansion absorber is provided on the top of the transformer body. The bottom of the metal corrugated expansion absorber is connected to the transformer oil inside the transformer body through a connecting port. The metal corrugated expansion absorber is used to buffer and absorb the explosion pressure generated during severe internal faults of the transformer. The metal corrugated expansion absorber includes: a metal corrugated expansion absorber shell, which is fixedly connected to the top of the transformer body. A pressure absorption plate is provided inside the metal corrugated expansion absorber. The counterweight can ensure that the expansion absorber is not completely lifted during normal operation of the transformer. An oil tank for adjusting the volume change of the transformer oil is fixedly installed on the right side of the top of the transformer body. A common bushing is connected to the outlet end of the transformer body. A gas relay and a pressure relief valve are installed on the top of the transformer body, and the pressure relief valve is connected to the transformer oil system.

[0011] Preferably, the interior of the corrugated metal expansion absorber shell is provided with a corrugated metal liner for absorbing and buffering implosion pressure. The top end of the corrugated metal liner is fixedly connected to the lower surface of the pressure absorption plate, and the bottom end of the corrugated metal liner is fixedly connected to the transformer body. The corrugated metal liner is connected to the transformer oil in the transformer body through a connecting port, and the pressure absorption plate is slidably connected to the corrugated metal expansion absorber shell through a pressure absorption plate slide.

[0012] Preferably, the outer shell of the metal corrugated expansion absorber is connected to the outside air through a louvered vent, and the lower right surface of the outer shell of the metal corrugated expansion absorber is provided with a drain outlet for discharging rainwater or condensate that may enter the box.

[0013] Preferably, the total contact area of ​​the connecting port is not less than 15 times the area of ​​the oil injection port of the pressure relief valve.

[0014] Preferably, a counterweight block, the height of which is determined by the height of the transformer oil conservator, is fixed to the upper surface of the pressure absorption plate.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This explosion-proof power transformer has the following advantages over traditional technology: By installing an independent metal corrugated expansion absorber on the top of the transformer, replacing the original expensive gas replenishment device and dry bushing, and connecting it to the transformer oil through a multi-point dispersed opening strategy, it effectively buffers the implosion pressure and reduces manufacturing costs. At the same time, the expansion absorber's external isolation from air and internal connection to the transformer oil simplifies the maintenance process and eliminates the dependence on frequent gas replenishment devices. In addition, the retention of the traditional gas relay provides comprehensive protection against both light and heavy gas, provides early warning of potential faults, and significantly improves operational safety.

[0016] By designing without altering the transformer oil circulation path and heat dissipation method, the heat accumulation problem caused by the air cushion layer is avoided, maintaining the original heat dissipation efficiency. In terms of explosion-proof performance, the expansion absorber can quickly respond to and absorb the impact pressure generated by internal severe faults, preventing the tank from tearing and enhancing structural stability. More importantly, it can be implemented with only minor modifications to ordinary power transformers, resulting in low modification costs and easy promotion. Attached Figure Description

[0017] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 A partial sectional view of the front view of a corrugated metal expansion absorber; Figure 3 The diagram shows the structure of the existing solution.

[0019] In the diagram: 1. Transformer voltage regulating switch; 2. Transformer body; 3. Ordinary bushing; 4. Corrugated metal expansion absorber; 5. Pressure relief valve; 6. Gas relay; 7. Oil conservator; 8. Corrugated metal expansion absorber housing; 9. Pressure absorption plate slide; 10. Corrugated metal inner liner of expansion absorber; 11. Pressure absorption plate; 12. Counterweight; 13. Louver; 14. Drain outlet; 15. Transformer oil connection port; 16. Long-tail dry bushing; 17. Air cushion layer; 18. Quick-acting hydraulic relay; 19. Online air cushion layer gas replenishment device. Detailed Implementation

[0020] 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.

[0021] Please see Figures 1-3 This utility model provides a technical solution: an explosion-proof power transformer, including: a transformer voltage regulating switch 1 and a transformer body 2. The transformer voltage regulating switch 1 is provided on the left side of the transformer body 2, and a metal corrugated expansion absorber 4 is provided on the top of the transformer body 2. The bottom of the metal corrugated expansion absorber 4 is connected to the transformer oil inside the transformer body 2 through a connecting port 15. The metal corrugated expansion absorber 4 is used to buffer and absorb the explosion pressure generated during a severe internal fault of the transformer. The metal corrugated expansion absorber 4 includes: a metal corrugated expansion absorber shell 8, which is fixedly connected to the top of the transformer body 2. A pressure absorption plate 11 is provided inside the metal corrugated expansion absorber 4. A counterweight 12 can ensure that the expansion absorber 4 is not completely lifted when the transformer is running normally. An oil tank 7 for adjusting the volume change of the transformer oil is fixedly installed on the right side of the top of the transformer body 2. A common bushing 3 is connected to the outlet end of the transformer body 2. A gas relay 6 and a pressure relief valve 5 are installed on the top of the transformer body 2. The pressure relief valve 5 is connected to the transformer oil system.

[0022] In the specific implementation process, it is worth noting that the transformer voltage regulating switch 1, as a key component for regulating the transformer's output voltage, adjusts the voltage by changing the winding turns ratio, ensuring that the transformer can stably output the required voltage under different load conditions. The transformer body 2 is the core part of the transformer, containing key components such as the iron core and windings. The iron core is made of a high-permeability material to reduce hysteresis losses, and the windings are wound on the iron core according to design requirements to realize the transmission and transformation of electrical energy. The metal corrugated expansion absorber 4, with its unique metal corrugated structure, can effectively absorb and buffer the impact pressure generated by severe faults inside the transformer, preventing the tank from tearing and ensuring the safe operation of the transformer. The oil conservator 7 is used to contain... The volume change of transformer oil due to temperature variations ensures that the transformer interior is always filled with transformer oil, maintaining good insulation and heat dissipation performance. The ordinary bushing 3, as an insulation and sealing component at the transformer's output end, is made of high-performance insulating materials and can withstand high voltage and high current, ensuring a safe connection between the transformer and external circuits. The gas relay 6 is used to monitor gas changes inside the transformer. When a fault occurs inside the transformer, the gas relay can act promptly, issuing an alarm signal or cutting off the power supply to protect the transformer from further damage. The pressure relief valve 5 is used to release pressure when the internal pressure of the transformer is too high, preventing the tank from exploding due to excessive pressure and ensuring the safety of the transformer and the surrounding environment.

[0023] Furthermore, the interior of the metal corrugated expansion absorber shell 8 is provided with a metal corrugated inner liner 10 for absorbing and buffering implosion pressure. The top end of the metal corrugated inner liner 10 is fixedly connected to the lower surface of the pressure absorption plate 11, and the bottom end of the metal corrugated inner liner 10 is fixedly connected to the transformer body 2. The metal corrugated inner liner 10 is connected to the transformer oil in the transformer body 2 through the connecting port 15. The pressure absorption plate 11 is slidably connected to the metal corrugated expansion absorber shell 8 through the pressure absorption plate slide 9.

[0024] In the specific implementation process, it is worth noting that the corrugated metal liner 10 is made of high-strength and high-elasticity metal material. Its unique corrugated structure can greatly increase the ability to absorb and buffer the implosion pressure. When a serious fault occurs inside the transformer, the corrugated metal liner 10 can respond quickly and absorb the impact pressure, preventing the pressure from being transmitted to the tank and causing tearing. The pressure absorption plate 11, as the connecting part between the corrugated metal liner 10 and the external structure, is slidably connected to the outer shell 8 of the corrugated metal expansion absorber through the pressure absorption plate slide 9, ensuring that the pressure absorption plate can slide freely under the action of implosion pressure, while maintaining a tight connection with the corrugated metal liner 10. The connecting port 15, as the connecting channel between the corrugated metal liner and the transformer oil in the transformer body 2, can ensure that the transformer oil flows freely between the corrugated metal liner 10 and the transformer body 2, achieving pressure balance and buffering.

[0025] Furthermore, the metal corrugated expansion absorber housing 8 is connected to the outside air with a louvered vent 13, and the lower right surface of the metal corrugated expansion absorber housing 8 is provided with a drain outlet 14 for draining rainwater or condensate that may enter the box.

[0026] In the specific implementation process, it is worth noting that the louvered vent 13 can ensure the circulation of air between the inside and outside of the metal corrugated expansion absorber housing 8, prevent excessive pressure from being generated inside due to temperature rise, and prevent external impurities such as rainwater and dust from entering the inside, thus ensuring the normal operation of the metal corrugated expansion absorber. The drain 14 is used to drain rainwater or condensate that may enter the metal corrugated expansion absorber housing 8, preventing moisture accumulation from causing corrosion or damage to the metal corrugated expansion absorber and ensuring its long-term stable operation.

[0027] Furthermore, the total contact area of ​​the connecting port 15 is not less than 15 times the area of ​​the oil injection port of the pressure relief valve.

[0028] In the specific implementation process, it is worth noting that the total contact area of ​​the connecting port 15 is not less than 15 times the oil injection port area of ​​the pressure relief valve. This is to ensure that when the internal pressure of the transformer is too high, the transformer oil can quickly flow into the metal corrugated expansion absorber through the connecting port, so as to realize the rapid release and buffering of pressure and prevent the transformer from being damaged by excessive pressure. At the same time, it can also ensure the free flow of transformer oil between the metal corrugated expansion absorber 4 and the transformer body 2, and maintain the pressure balance and stability inside the transformer.

[0029] Furthermore, a counterweight 12, which is determined according to the height of the transformer oil conservator, is fixed to the upper surface of the pressure absorption plate 11.

[0030] In the specific implementation process, it is worth noting that the counterweight 12 is determined according to the height of the transformer oil conservator. Its function is to maintain the stable position of the pressure absorption plate 11 during normal operation of the transformer, and to prevent the pressure absorption plate 11 from being completely lifted due to fluctuations in transformer oil or external vibrations, which would affect the normal operation of the metal corrugated expansion absorber. At the same time, the counterweight 12 can also be adjusted according to actual needs to adapt to the requirements of transformers of different specifications and models.

[0031] Working principle: Implosion pressure buffering principle: When a severe fault occurs inside the transformer, such as a short circuit, it generates enormous implosion impact pressure. At this time, the corrugated metal expansion absorber 4 plays a crucial role. The corrugated metal inner liner 10 inside the corrugated metal expansion absorber 4 is made of high-strength, high-elasticity metal material. Its unique corrugated structure gives it powerful pressure absorption and buffering capabilities. Under the impact of implosion pressure, the corrugated metal inner liner 10 deforms rapidly, absorbing the impact energy and preventing the pressure from being directly transmitted to the transformer tank, thus avoiding tank tearing and ensuring transformer safety. Simultaneously, the pressure absorption plate 11 is slidably connected to the corrugated metal expansion absorber outer shell 8 via the pressure absorption plate slide 9. It slides freely under the action of implosion pressure and remains tightly connected to the corrugated metal inner liner 10, ensuring pressure transmission and buffering effects. The connecting port 15 ensures that transformer oil flows freely between the corrugated metal inner liner 10 and the transformer body 2, achieving pressure balance and buffering.

[0032] Gas pressure regulation principle: During transformer operation, internal gas and pressure can change due to various factors. The gas relay 6 constantly monitors changes in the internal gas of the transformer. Once an abnormality is detected, such as gas generated by a fault, it can act promptly, issuing an alarm signal or cutting off the power supply to prevent the fault from escalating further. The metal corrugated expansion absorber quickly absorbs the pressure shock wave generated by the fault, preventing the oil tank from cracking or exploding due to excessive impact. The pressure relief valve 5 is connected to the transformer oil system and is responsible for finally releasing the residual pressure to balance the internal and external pressures of the transformer. The louvered vent 13 on the outer shell 8 of the metal corrugated expansion absorber can ensure air circulation between the inside and outside, ensuring that the external pressure of the metal corrugated expansion liner is always equal to atmospheric pressure, while also preventing rainwater, dust, and other impurities from entering, ensuring the normal operation of the absorber. The drain outlet 14 can drain rainwater or condensate that has entered the outer shell, preventing moisture from causing corrosion damage to the absorber.

[0033] Stable operation guarantee principle: To ensure the stable operation of the metal corrugated expansion absorber 4 during normal transformer operation, a counterweight 12, determined according to the height of the transformer oil conservator, is fixed to the upper surface of the pressure absorption plate 11. The counterweight 12 can maintain the stable position of the pressure absorption plate 11 and prevent the pressure absorption plate 11 from being completely lifted due to fluctuations in transformer oil or external vibrations, thus affecting the normal function of the absorber. In addition, the total contact area of ​​the connecting port 15 is not less than 15 times the oil spray port area of ​​the pressure relief valve. This design ensures that when the internal pressure of the transformer is too high, the transformer oil can quickly flow into the metal corrugated expansion absorber through the connecting port, realizing rapid pressure release and buffering, maintaining the internal pressure balance and stability of the transformer, and enabling the transformer to operate stably under different operating conditions.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof power transformer, comprising: The transformer includes a voltage regulating switch (1) and a transformer body (2). The voltage regulating switch (1) is located on the left side of the transformer body (2). The transformer body (2) is characterized in that a metal corrugated expansion absorber (4) is located at the top of the transformer body (2). The bottom of the metal corrugated expansion absorber (4) is connected to the transformer oil inside the transformer body (2) through a connecting port (15). The metal corrugated expansion absorber (4) is used to buffer and absorb the implosion pressure generated during severe internal faults of the transformer. The metal corrugated expansion absorber (4) includes a metal corrugated expansion absorber shell (8). The outer shell (8) is fixedly connected to the top of the transformer body (2). The metal corrugated expansion absorber (4) is equipped with a pressure absorption plate (11). The counterweight (12) can ensure that the expansion absorber (4) is not completely lifted when the transformer is running normally. An oil tank (7) for adjusting the volume change of transformer oil is fixedly installed on the right side of the top of the transformer body (2). The outlet end of the transformer body (2) is connected to a common bushing (3). A gas relay (6) and a pressure relief valve (5) are installed on the top of the transformer body (2). The pressure relief valve (5) is connected to the transformer oil system.

2. The explosion-proof power transformer according to claim 1, characterized in that: The metal corrugated expansion absorber housing (8) is provided with a metal corrugated inner liner (10) for absorbing and buffering implosion pressure. The top of the metal corrugated inner liner (10) is fixedly connected to the lower surface of the pressure absorption plate (11), and the bottom of the metal corrugated inner liner (10) is fixedly connected to the transformer body (2). The metal corrugated inner liner (10) is connected to the transformer oil in the transformer body (2) through the connecting port (15). The pressure absorption plate (11) is slidably connected to the metal corrugated expansion absorber housing (8) through the pressure absorption plate slide (9).

3. The explosion-proof power transformer according to claim 1, characterized in that: The outer shell (8) of the metal corrugated expansion absorber is connected to the outside air through a louvered vent (13), and the lower right surface of the outer shell (8) of the metal corrugated expansion absorber is provided with a drain (14) for draining rainwater or condensate that may enter the box.

4. The explosion-proof power transformer according to claim 1, characterized in that: The total contact area of ​​the connecting port (15) is not less than 15 times the oil injection port area of ​​the pressure relief valve.

5. The explosion-proof power transformer according to claim 1, characterized in that: The upper surface of the pressure absorption plate (11) is fixed with a counterweight (12) according to the height of the transformer oil tank.

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