A transformer explosion-proof rapid pressure relief device

Abstract

This invention discloses a transformer explosion-proof rapid pressure relief device, relating to the field of transformer safety protection technology. The device includes an isolation valve, an explosion-proof membrane body, and a pressure relief chamber arranged sequentially. An adapter is located on the side of the isolation valve away from the explosion-proof membrane body, and the isolation valve is fixedly installed on the target transformer tank cover via the adapter. The explosion-proof membrane body is installed between the isolation valve and the pressure relief chamber. The explosion-proof membrane body controls the connection state between the isolation valve and the pressure relief chamber according to the safety threshold of the target transformer. This transformer explosion-proof rapid pressure relief device, with the help of the explosion-proof membrane body, can accurately respond within milliseconds to pressure increases in the tank caused by electrical faults, under the pre-set safety threshold of the target transformer, rapidly releasing the high pressure in the tank to the pressure relief chamber, thus achieving rapid pressure relief and explosion protection.

Description

Technical Field

[0001] This invention belongs to the field of transformer safety protection technology, specifically relating to a transformer explosion-proof rapid pressure relief device. Background Technology

[0002] An oil-immersed transformer is a type of transformer that uses oil as its primary insulation and cooling medium. During operation, if a severe short circuit or arcing fault occurs inside an oil-immersed transformer, a large amount of gas will be generated instantaneously, causing a rapid increase in pressure inside the tank. If this pressure cannot be released in time, it may cause structural rupture of the tank or even an explosion, leading to serious power accidents and secondary disasters.

[0003] Currently, the pressure relief devices of mainstream transformers rely on the movement of mechanical structures for their action response, which has a certain response delay. When faced with rapidly developing faults, the pressure relief may not be timely enough, making it difficult to effectively prevent dangerous situations such as tank rupture. Summary of the Invention

[0004] The purpose of this invention is to provide a transformer explosion-proof rapid pressure release device with a simple structure and reasonable design that can achieve rapid pressure release in order to solve the above problems.

[0005] The present invention achieves the above objectives through the following technical solutions: A transformer explosion-proof rapid pressure relief device includes an isolation valve, an explosion-proof membrane body, and a pressure relief chamber arranged in sequence. An adapter is provided on the side of the isolation valve away from the explosion-proof membrane body. The isolation valve is fixedly installed on the tank cover of the target transformer via the adapter. The explosion-proof membrane body is installed between the isolation valve and the pressure relief chamber. The explosion-proof membrane body is used to control the connection state between the isolation valve and the pressure relief chamber according to the safety threshold of the target transformer.

[0006] As a further optimization of the present invention, the explosion-proof membrane body includes a connector, a vacuum connector, and an explosion-proof membrane rupture indicator. The vacuum connector is connected to the membrane cavity of the explosion-proof membrane body and is used to control the vacuum state of the membrane cavity of the explosion-proof membrane body. The explosion-proof membrane rupture indicator is disposed in the membrane cavity and is electrically connected to a controller through the connector.

[0007] As a further optimization of the present invention, the response time of the explosion-proof membrane body is 0.5 milliseconds to 6 milliseconds, and the explosion-proof membrane body makes a response action within this response time. The length of the response time of the explosion-proof membrane body directly reflects the severity of the electrical fault.

[0008] As a further optimization of the present invention, the explosion-proof membrane body also includes an explosion-proof membrane overpressure protection component, which is installed on one side of the explosion-proof membrane rupture indicator.

[0009] As a further optimization of the present invention, the pressure relief chamber includes a pressure relief chamber body, which has an exhaust pipe interface, an oil drain pipe interface, and an explosion-proof membrane interface. The pressure relief chamber body is connected to the output port of the explosion-proof membrane body through the explosion-proof membrane interface, the pressure relief chamber body is connected to the exhaust pipe connection port through the exhaust pipe interface, and the pressure relief chamber body is connected to the oil drain pipe connection port through the oil drain pipe interface, wherein the exhaust pipe interface is located above the oil drain pipe interface.

[0010] As a further optimization of the present invention, an explosion-proof bracket is fixedly connected to the outer end of the depressurization chamber, and a base is fixedly connected to the adapter. The explosion-proof bracket is fixedly connected to the base through a support rod.

[0011] As a further optimization of the present invention, a shock absorber is provided at the connection end between the support rod and the explosion-proof bracket.

[0012] As a further optimization of the present invention, multiple explosion-proof brackets are provided, and support rods are provided correspondingly to the explosion-proof brackets, wherein the axis of the support rods is consistent with the axis of the depressurization chamber.

[0013] As a further optimization of the present invention, an ID tag is provided on the outer side of the explosion-proof film body.

[0014] As a further optimization of the present invention, a buffer is provided between the explosion-proof membrane body and the isolation valve.

[0015] The present invention has at least the following beneficial effects: The present invention provides a transformer explosion-proof rapid pressure relief device, comprising an isolation valve, an explosion-proof membrane body and a pressure relief chamber arranged in sequence. The isolation valve is fixedly installed on the tank cover of the target transformer through an adapter. The explosion-proof membrane body is arranged between the isolation valve and the pressure relief chamber, so that the explosion-proof membrane body can make a timely and accurate response to the pressure rise in the tank caused by electrical faults under the pre-set safety threshold of the target transformer, and rapidly release the high pressure in the tank to the pressure relief chamber. Then, the pressure relief chamber eliminates the pressure wave generated by the dynamic pressure in the target transformer to reduce the pressure in the target transformer, that is, to achieve the pressure relief effect. Furthermore, the explosion-proof membrane body includes an explosion-proof membrane rupture indicator and an explosion-proof membrane overvoltage protection device. The explosion-proof membrane rupture indicator is precisely calculated and customized according to the key parameters such as the design pressure and safety margin of the target transformer, so that the preset trigger threshold of the explosion-proof membrane rupture indicator is fully matched with the safety protection requirements of the transformer. This parameter adaptation enables the explosion-proof membrane body to respond within a response time of 0.5 milliseconds to 6 milliseconds, and restore the pressure of the main oil tank, on-load tap changer, oil-filled cable box, and oil-filled bushing cable box to normal values ​​within a few milliseconds, ensuring the normal operation of the transformer. Furthermore, the pressure relief chamber includes a pressure relief chamber body, with an explosion-proof bracket installed below the pressure relief chamber body. The explosion-proof bracket is fixedly installed on the base by a support rod, which is coaxial with the axis of the pressure relief chamber body. It can directly bear the axial load and evenly transfer it to the base through the correspondingly configured explosion-proof bracket, avoiding local stress concentration caused by load offset. This prevents key parts such as the pressure relief chamber body and explosion-proof membrane interface from deforming, cracking, or failing to seal due to uneven stress, thus ensuring the structural integrity during the high-pressure relief process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the explosion-proof film body of the present invention; Figure 3 This is a schematic diagram of the depressurization chamber of the present invention.

[0017] In the diagram: 1. Adapter; 2. Isolation valve; 3. Buffer; 4. Explosion-proof membrane body; 5. Pressure relief chamber; 6. Oil drain pipe connection port; 7. Exhaust pipe connection port; 8. Shock absorber; 9. Support rod; 10. Base; 41. Connector; 42. Vacuum connector; 43. Explosion-proof membrane rupture indicator; 44. Explosion-proof membrane overpressure protection device; 45. ID tag; 51. Exhaust pipe interface; 52. Oil drain pipe interface; 53. Depressurization chamber; 54. Explosion-proof bracket; 55. Explosion-proof membrane interface. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0019] In the description of the embodiments of this application, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] like Figure 1 and Figure 2 As shown, the present invention provides a transformer explosion-proof rapid pressure relief device, comprising an isolation valve 2, an explosion-proof diaphragm body 4, and a pressure relief chamber 5 arranged sequentially, to... Figure 1Taking the orientation shown as an example, the isolation valve 2, the explosion-proof membrane body 4, and the pressure relief chamber 5 are arranged sequentially from bottom to top. An adapter 1 is provided on the side of the isolation valve 2 away from the explosion-proof membrane body 4. The isolation valve 2 is fixedly installed on the tank cover of the target transformer through the adapter 1. The adapter 1 has a hollow structure, which allows the target transformer tank to be connected to the isolation port of the isolation valve 2 through the adapter 1. The explosion-proof membrane body 4 is installed between the isolation valve 2 and the pressure relief chamber 5. The explosion-proof membrane body 4 is used to control the connection state between the isolation valve 2 and the pressure relief chamber 5 according to the safety threshold of the target transformer.

[0021] By setting a safety threshold for the target transformer in advance, the explosion-proof membrane body 4 can make a timely and accurate response under the condition of pressure increase in the oil tank caused by electrical faults, and quickly release the high pressure in the oil tank to the pressure relief chamber 5. Then, the pressure relief chamber 5 eliminates the pressure wave generated by the dynamic pressure in the target transformer, thereby reducing the pressure in the target transformer and achieving the pressure relief effect.

[0022] For example, see [link to relevant documentation]. Figure 2 The explosion-proof membrane body 4 includes a connector 41, a vacuum connector 42, and an explosion-proof membrane rupture indicator 43. The vacuum connector 42 communicates with the membrane cavity of the explosion-proof membrane body 4 and is used to control the vacuum state of the membrane cavity. The explosion-proof membrane rupture indicator 43 is disposed in the membrane cavity and is electrically connected to a controller through the connector 41. The controller sets the safety threshold of the explosion-proof membrane rupture indicator 43, and the setting reference parameters include the design pressure of the target transformer and the safety margin.

[0023] Among them, the explosion-proof membrane rupture indicator 43 is one of the core components for achieving precise protection of the device. It can be accurately calculated and customized according to key parameters such as the design pressure and safety margin of the target transformer, so that the preset trigger threshold of the explosion-proof membrane rupture indicator 43 is fully matched with the safety protection requirements of the transformer, thus achieving parameter adaptation. Moreover, when the internal pressure of the transformer rises to the preset safety pressure threshold, the explosion-proof membrane rupture indicator 43 can quickly detect and trigger the explosion-proof membrane rupture, ensuring that the explosion-proof membrane acts in a timely manner at the most critical pressure node, avoiding excessive pressure that could lead to transformer tank rupture. At the same time, its triggering logic can indirectly reflect the severity of the fault, providing a reference for subsequent fault diagnosis.

[0024] It should be noted that the core function of the vacuum connector 42 is to maintain a vacuum environment inside the explosion-proof membrane. On the one hand, the vacuum state can prevent the presence of gas inside the explosion-proof membrane from affecting the stability and accuracy of its burst pressure, ensuring that the explosion-proof membrane can strictly trigger its action according to the preset pressure threshold, without response deviation caused by internal gas interference; on the other hand, the vacuum environment can protect the core functional components of the explosion-proof membrane (such as the explosion-proof membrane rupture indicator 43) from external moisture, impurities, etc., extending the service life of the explosion-proof membrane and ensuring its long-term stable operation.

[0025] The response time of the explosion-proof membrane body 4 is 0.5 to 6 milliseconds. Within this response time, the explosion-proof membrane body 4 fully opens its membrane cavity, connecting the pressure relief chamber 5 and the isolation valve 2. The length of the response time directly reflects the severity of the electrical fault. For example, under a large pressure gradient, the time required for the explosion-proof membrane body 4 to fully open is shorter than under a small pressure gradient. Therefore, the length of this response time directly reflects the severity of the electrical fault, thereby restoring the pressure of the main oil tank, on-load tap changer, oil-filled cable box, and oil-filled bushing cable box to normal values ​​within milliseconds, ensuring the normal operation of the transformer.

[0026] Continue reading Figure 2 The explosion-proof membrane body 4 also includes an explosion-proof membrane overpressure protection component 44, which is installed on one side of the explosion-proof membrane rupture indicator 43. Its core function is to deal with extreme abnormal situations. When an unexpected serious fault occurs inside the target transformer, causing the pressure to momentarily exceed the preset burst pressure of the explosion-proof membrane body 4, or even approach the self-endurance limit of the explosion-proof membrane body 4, the explosion-proof membrane overpressure protection component 44 will activate secondary protection to prevent the explosion-proof membrane from rupturing irregularly or causing fragments to fly due to excessive pressure. At the same time, it further restricts pressure transmission, prevents the fault from expanding, provides additional safety for the transformer, and improves the overall explosion-proof reliability of the device.

[0027] Among them, such as Figure 2 As shown, an ID tag 45 is provided on the outer side of the explosion-proof membrane body 4. The ID tag 45 is the identification and traceability component of the explosion-proof membrane body 4. The tag stores core data such as the production batch, manufacturing date, and verification information of the explosion-proof membrane body. During the installation, maintenance, and repair of the device, the staff can quickly confirm the compatibility and service life of the explosion-proof membrane through the ID tag 45. At the same time, when a fault occurs or replacement is required, the product source and quality information can be accurately traced, which provides convenience for the standardized management and maintenance of the equipment.

[0028] For example, see [link to relevant documentation]. Figure 1 and Figure 3The pressure relief chamber 5 includes a pressure relief chamber body 53, which has an exhaust pipe interface 51, an oil drain pipe interface 52, and an explosion-proof membrane interface 55. The pressure relief chamber body 53 is connected to the output port of the explosion-proof membrane body 4 through the explosion-proof membrane interface 55, and is connected to the exhaust pipe connection port 7 through the exhaust pipe interface 51. The pressure relief chamber body 53 is connected to the oil drain pipe connection port 6 through the oil drain pipe interface 52. The exhaust pipe interface 51 is located above the oil drain pipe interface 52.

[0029] In the above embodiment, when a fault occurs inside the transformer, a high-pressure gas and oil mixture is generated. The depressurization chamber 53, through a specific internal spatial layout and a structural design where the exhaust pipe interface 51 is located above the oil drain pipe interface 52, achieves efficient separation of the gas and oil in the high-pressure medium. The less dense gas naturally rises and is discharged through the upper exhaust pipe interface 51 into the exhaust pipe connection port 7; the denser oil sinks and is discharged through the lower oil drain pipe interface 52 into the oil drain pipe connection port 6. This classified discharge method avoids secondary pollution or safety hazards caused by gas-liquid mixing and spraying, and also facilitates subsequent processing of the recovered oil, reducing resource waste.

[0030] It should be noted that, as Figure 1 and Figure 3 As shown, an explosion-proof bracket 54 is fixedly connected to the outer end of the depressurization chamber 53, and a base 10 is fixedly connected to the adapter 1. The explosion-proof bracket 54 is fixedly connected to the base 10 via a support rod 9. This enables the depressurization chamber 53 to be supported and installed relative to the adapter 1.

[0031] Multiple explosion-proof brackets 54 are provided, with support rods 9 corresponding to each bracket 54. The axis of the support rods 9 is aligned with the axis of the pressure relief chamber 53. When the pressure relief chamber 53 receives the high-pressure medium introduced by the explosion-proof membrane, it will bear a huge axial impact force along its own axis (the jet reaction force of the high-pressure medium and the pressure wave impact load). The support rods 9 are coaxial with the axis of the pressure relief chamber 53, which can directly bear this axial load and evenly transfer it to the base 10 through the corresponding explosion-proof brackets 54. This avoids load offset leading to local stress concentration, prevents deformation, cracking, or sealing failure of key parts such as the pressure relief chamber 53 and the explosion-proof membrane interface 55 due to uneven stress, and ensures the structural integrity during the high-pressure relief process.

[0032] Moreover, such as Figure 1As shown, a shock absorber 8 is installed at the connection end between the support rod 9 and the explosion-proof bracket 54. When the transformer is released from pressure due to a fault, the high-pressure medium injected into the pressure relief chamber 5 will generate a strong axial impact load. This load is transmitted to the support rod 9 through the pressure relief chamber 53 and the explosion-proof bracket 54. As a flexible buffer component, the shock absorber 8 can quickly absorb the impact energy and dissipate the impact force through its own deformation (such as elastic compression and damping dissipation), avoiding the impact load from being directly and rigidly transmitted to the base 10 and the transformer tank cover, preventing the interfaces from loosening, the pressure relief chamber 53 from deforming, or the base 10 from cracking, thus protecting the overall structural integrity of the device.

[0033] It should be noted that, as Figure 1 As shown, a buffer 3 is provided between the explosion-proof membrane body 4 and the isolation valve 2. When a transformer fails, the high-pressure medium generated will be conducted outward through the isolation valve 2 at an extremely high speed, forming a strong instantaneous impact load. The buffer 3, through its internal cavity structure (such as expansion space, damping channels, etc.), can effectively slow down the flow rate of the high-pressure medium, disperse the impact energy, and prevent the instantaneous pressure peak from directly acting on the explosion-proof membrane body 4. This not only prevents the explosion-proof membrane from unexpectedly rupturing (malfunctioning) due to instantaneous overpressure impact, but also reduces the impact damage to precision components such as the internal rupture indicator 43 and overpressure protection component 44 of the explosion-proof membrane, ensuring the structural integrity and functional reliability of the explosion-proof membrane.

[0034] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A transformer explosion-proof rapid pressure relief device, characterized in that, The device includes an isolation valve (2), an explosion-proof membrane body (4), and a pressure relief chamber (5) arranged in sequence. An adapter (1) is provided on the side of the isolation valve (2) away from the explosion-proof membrane body (4). The isolation valve (2) is fixedly installed on the tank cover of the target transformer through the adapter (1). The explosion-proof membrane body (4) is installed between the isolation valve (2) and the pressure relief chamber (5). The explosion-proof membrane body (4) is used to control the connection state between the isolation valve (2) and the pressure relief chamber (5) according to the safety threshold of the target transformer.

2. The transformer explosion-proof rapid pressure relief device according to claim 1, characterized in that, The explosion-proof membrane body (4) includes a connector (41), a vacuum connector (42), and an explosion-proof membrane rupture indicator (43). The vacuum connector (42) is connected to the membrane cavity of the explosion-proof membrane body (4) and is used to control the vacuum state of the membrane cavity of the explosion-proof membrane body (4). The explosion-proof membrane rupture indicator (43) is installed in the membrane cavity and is electrically connected to a controller through the connector (41).

3. The transformer explosion-proof rapid pressure relief device according to claim 2, characterized in that, The response time of the explosion-proof membrane body (4) is 0.5 milliseconds to 6 milliseconds. The explosion-proof membrane body (4) makes a response action within this response time. The length of the response time of the explosion-proof membrane body (4) directly reflects the severity of the electrical fault.

4. The transformer explosion-proof rapid pressure relief device according to claim 3, characterized in that, The explosion-proof membrane body (4) also includes an explosion-proof membrane overpressure protection component (44), which is installed on one side of the explosion-proof membrane rupture indicator (43).

5. The transformer explosion-proof rapid pressure relief device according to claim 4, characterized in that, The pressure relief chamber (5) includes a pressure relief chamber body (53), which has an exhaust pipe interface (51), an oil drain pipe interface (52), and an explosion-proof membrane interface (55). The pressure relief chamber body (53) is connected to the output port of the explosion-proof membrane body (4) through the explosion-proof membrane interface (55). The pressure relief chamber body (53) is connected to the exhaust pipe connection port (7) through the exhaust pipe interface (51). The pressure relief chamber body (53) is connected to the oil drain pipe connection port (6) through the oil drain pipe interface (52). The exhaust pipe interface (51) is located above the oil drain pipe interface (52).

6. The transformer explosion-proof rapid pressure relief device according to claim 5, characterized in that, An explosion-proof bracket (54) is fixedly connected to the outer end of the depressurization chamber (53), and a base (10) is fixedly connected to the adapter (1). The explosion-proof bracket (54) is fixedly connected to the base (10) through a support rod (9).

7. The transformer explosion-proof rapid pressure relief device according to claim 6, characterized in that, Shock absorbers (8) are provided at the connection end between the support rod (9) and the explosion-proof bracket (54).

8. The transformer explosion-proof rapid pressure relief device according to claim 7, characterized in that, Multiple explosion-proof brackets (54) are provided, and support rods (9) are provided corresponding to the explosion-proof brackets (54). The axis of the support rods (9) is consistent with the axis of the depressurization chamber (53).

9. A transformer explosion-proof rapid pressure relief device according to claim 3, characterized in that, An ID tag (45) is provided on the outside of the explosion-proof membrane body (4).

10. A transformer explosion-proof rapid pressure relief device according to claim 1, characterized in that, A buffer (3) is provided between the explosion-proof membrane body (4) and the isolation valve (2).

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