Explosion-proof lifting seat and converter transformer

Abstract

The utility model discloses an anti -explosion type elevating seat, including elevating seat body, pressure -relief device, gas monitoring devices and gas relay, the top of elevating seat body is established with first interface and second interface, and the middle part or upper part position is established with third interface, gas monitoring devices are connected on first interface, are used for monitoring the gas in elevating seat body whether satisfies set requirement, and gas relay is connected on second interface, is used for executing alarm action when the pressure in elevating seat body exceeds set value, and pressure -relief device includes diaphragm type pressure -relief mechanism and oil pipe, and diaphragm type pressure -relief mechanism one end is connected on third interface, and the other end is through oil pipe and leads to the oil pool below third interface, is used for when the pressure in elevating seat body breaks diaphragm to export oil flow and air current. The utility model discloses an anti -explosion type elevating seat can improve transformer operation safety, realizes quick pressure -relief, effectively avoids the accident to occur. The utility model also provides a converter transformer.

Description

Technical Field

[0001] This utility model belongs to the field of transformer manufacturing technology, specifically relating to an explosion-proof riser base and converter transformer. Background Technology

[0002] As a key piece of equipment in ultra-high voltage direct current (UHVDC) transmission projects, converter transformers require high stability, reliability, and safety during operation. Due to the high voltage levels, the electric field, magnetic field, and insulation structure of the bushing riser section of the converter transformer are typically complex, making the prevention of faults in this area particularly important. If a fault occurs in the bushing riser section, especially a high-energy arc discharge fault, the transformer oil inside will instantly vaporize and decompose, generating a large amount of gas and creating high pressure. If an effective monitoring signal is not issued and the pressure is not released, the riser section may explode. Furthermore, because converter transformers contain a large amount of transformer oil, this could potentially lead to a fire in the converter transformer or even the converter station, causing significant damage to the transmission system. Utility Model Content

[0003] The technical problem to be solved by this utility model is to address the aforementioned shortcomings in the existing technology by providing an explosion-proof riser seat. This riser seat structure can improve the operational safety of transformers, achieve rapid pressure relief, and effectively prevent accidents. This utility model also provides a converter transformer.

[0004] This utility model provides an explosion-proof riser, including a riser body, a pressure relief device, a gas monitoring device, and a gas relay. The riser body has a first interface and a second interface on its top, and a third interface in its middle or upper part. The gas monitoring device is connected to the first interface to monitor whether the gas inside the riser body meets the set requirements. The gas relay is connected to the second interface to trigger an alarm when the pressure inside the riser body exceeds the set value. The pressure relief device includes a diaphragm-type pressure relief mechanism and an oil guide pipe. One end of the diaphragm-type pressure relief mechanism is connected to the third interface, and the other end is led to an oil tank located below the third interface through the oil guide pipe, so as to discharge the oil and gas flow when the pressure inside the riser body breaks the diaphragm.

[0005] Furthermore, the lifting seat body has a cylindrical structure arranged in the vertical direction, the third interface is arranged in the horizontal direction, and the diaphragm-type pressure relief mechanism has a columnar structure and is connected to the third interface in the horizontal direction.

[0006] Furthermore, the pressure relief device also includes a support frame, with its two ends connected to the diaphragm-type pressure relief mechanism and the lifting seat body, respectively, forming a triangular support structure with the diaphragm-type pressure relief mechanism and the lifting seat body.

[0007] Furthermore, the oil guide pipe includes a bend, an inclined pipe, and a straight pipe arranged sequentially from top to bottom. The bend is a pipe section that turns vertically downward from the end of the diaphragm-type pressure relief mechanism; the straight pipe is a vertical pipe section that is close to the riser body and the oil tank of the transformer where the explosion-proof riser is located, and is located below the diaphragm-type pressure relief mechanism; the inclined pipe connects the bend and the straight pipe.

[0008] Furthermore, the pressure relief device also includes an isolation valve, which is a normally open valve connected between the diaphragm-type pressure relief mechanism and the third interface.

[0009] Furthermore, the gas monitoring device includes a single hydrogen online monitoring device and a single acetylene gas online monitoring device. The single hydrogen online monitoring device is used to monitor whether the hydrogen gas in the riser body meets the set requirements, and the single acetylene gas online monitoring device is used to monitor whether the acetylene gas in the riser body meets the set requirements. The first interface is provided with two branches, which are respectively connected to the single hydrogen online monitoring device and the single acetylene gas online monitoring device.

[0010] Furthermore, the single-hydrogen online monitoring device includes a first connecting valve and a rapid reaction gas content detection device. The rapid reaction gas content detection device is used to monitor whether the hydrogen in the riser body meets the set requirements. The first connecting valve is a normally open valve, connected between the rapid reaction gas content detection device and the branch port of the first interface.

[0011] Furthermore, the gas relay includes a relay body, a second connecting valve, and a control circuit module. The second connecting valve is a normally open valve. The relay body is connected to the second interface through the second connecting valve and is electrically connected to the control circuit module. When the pressure in the riser body exceeds the set value, the contacts of the relay body actuate and connect the control circuit module. The control circuit module is used to issue an alarm signal and / or isolate the transformer where the explosion-proof riser is located from the power grid when connected.

[0012] Furthermore, the explosion-proof riser also includes a vacuum valve. A fourth interface is provided on the top of the riser body. The vacuum valve is a normally closed valve, connected to the fourth interface, and connected to an external vacuuming device to provide a vacuum for the riser body during the oil filling stage.

[0013] This utility model also provides a converter transformer, including an oil tank, a bushing, and the aforementioned explosion-proof riser. The bottom end of the explosion-proof riser is connected to the tank cover of the oil tank, and the top end is connected to the bushing.

[0014] This invention relates to an explosion-proof transformer riser, which, by installing a gas monitoring device, a gas relay, and a pressure relief device on the riser body, constructs a three-in-one safety defense line of "fault early warning - status alarm - post-accident protection." Specifically: the gas monitoring device, through continuous online analysis of characteristic gases dissolved in transformer oil, can detect insulation degradation trends in the early stages of a fault, providing quantitative basis for condition-based maintenance; the gas relay can provide timely alarms after pressure increases, giving maintenance personnel a valuable window for action; and the pressure relief device can quickly open the pressure relief channel to prevent the continuous accumulation of high voltage. These three functions complement each other, from pre-fault prevention and fault alarm to post-fault loss mitigation, together forming the safety system of the riser body. This achieves a comprehensive improvement in the riser's own safety, not only enabling timely fault detection and pressure relief but also effectively avoiding serious accidents caused by faults, ensuring the safe and stable operation of the transformer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the explosion-proof lifting seat in Embodiment 1 of this utility model.

[0016] In the diagram: 1. Elevator body; 11. First interface; 12. Second interface; 13. Third interface; 14. Fourth interface; 2. Pressure relief device; 21. Diaphragm pressure relief mechanism; 22. Oil guide pipe; 221. Bend; 222. Inclined pipe; 223. Straight pipe; 23. Support; 24. Isolation valve; 3. Gas monitoring device; 31. Single hydrogen online monitoring device; 311. Rapid reaction gas content detection device; 312. First connecting valve; 32. Single acetylene gas online monitoring device; 4. Gas relay; 41. Second connecting valve; 42. Relay body; 5. Vacuum valve; 6. Oil tank; 7. Sleeve. Detailed Implementation

[0017] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of this utility model.

[0018] In the description of this utility model, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience and simplification of the description and do not indicate or imply that the device or element 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 utility model.

[0019] In the description of this utility model, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Example 1

[0022] The explosion-proof riser seat of this embodiment can be used in converter transformers to solve the problem of effective monitoring and rapid pressure relief of characteristic gases in converter transformer bushing riser seats. For example... Figure 1 As shown, the explosion-proof riser includes a riser body 1, a pressure relief device 2, a gas monitoring device 3, and a gas relay 4. The top of the riser body 1 is provided with a first interface 11 and a second interface 12, and a third interface 13 is provided at the middle or upper part.

[0023] Gas monitoring device 3 is connected to the first interface 11 and is used to monitor whether the gas in the riser body 1 meets the set requirements. In the early stage of a fault, characteristic gases dissolved in transformer oil, such as hydrogen and acetylene, will change. Monitoring this value can achieve effective early warning.

[0024] Gas relay 4 is connected to the second interface 12 and is used to perform an alarm action when the pressure inside the lifting seat body 1 exceeds the set value. The set value is the highest pressure value that can be allowed under safe operating conditions. When the pressure exceeds the set value, that is, when a fault occurs inside the lifting seat, the alarm action performed includes issuing an alarm signal and automatically disconnecting the transformer (from the power grid).

[0025] The pressure relief device 2 includes a diaphragm-type pressure relief mechanism 21 and an oil guide pipe 22. One end of the diaphragm-type pressure relief mechanism 21 is connected to the third interface 13, and the other end is led to an oil pool located below the third interface 13 through the oil guide pipe 22. This mechanism is used to discharge oil and gas flow when the pressure inside the riser body 1 ruptures the diaphragm. When a high-energy arc fault occurs inside the riser, a high-speed shock wave is generated. The explosion-proof diaphragm of the diaphragm-type pressure relief mechanism 21 can be instantly ruptured under the impact, opening the high-speed pressure relief channel. Simultaneously, the transformer oil inside the riser is discharged and guided to the oil pool on the converter station ground via the oil guide pipe 22. A sensing component can also be installed at the pressure relief device 2 to send a signal (to a host computer or mobile terminal, etc.) after the pressure relief device 2 is ruptured, alerting maintenance personnel that the pressure relief device 2 has been activated. Compared to ordinary pressure relief valves, this type of diaphragm pressure relief structure has advantages such as fast response speed, large flow area, fast pressure relief speed, and high reliability.

[0026] This embodiment of the explosion-proof transformer riser, by installing a gas monitoring device 3, a gas relay 4, and a pressure relief device 2 on the riser body 1, constructs a three-in-one safety defense line of "fault early warning - status alarm - post-accident protection". Specifically: the gas monitoring device 3, through continuous online analysis of characteristic gases dissolved in the transformer oil, can detect insulation degradation trends in the early stages of a fault, providing quantitative basis for condition-based maintenance; the gas relay 4 can provide timely alarms after pressure increases, giving maintenance personnel a valuable window for action; and the pressure relief device 2 can quickly open the pressure relief channel to prevent the continuous accumulation of high voltage. These three functions complement each other, from pre-fault prevention and fault alarm to post-fault loss mitigation, together forming the safety system of the riser body 1, achieving a comprehensive improvement in the riser's own safety. It not only enables timely fault detection and pressure relief but also effectively avoids serious accidents caused by faults, ensuring the safe and stable operation of the transformer.

[0027] During a malfunction, the generated gas continuously accumulates. The gas monitoring device 3, gas relay 4, and pressure relief device 2 are respectively located at the top and upper-middle part of the riser body 1, corresponding to the gas accumulation points. Therefore, they can respond reliably to malfunctions promptly, improving triggering flexibility and avoiding subsequent accident risks caused by delays. Simultaneously, they prevent interference with flanges, fasteners, and other components at the connections between the various parts and the riser body 1 and the oil tank. Furthermore, the interfaces of smaller components such as the gas monitoring device 3 and gas relay 4, and the interface of the larger component, pressure relief device 2, are arranged vertically in separate areas, making full use of vertical space. In this embodiment, (in the projection on the horizontal plane) the gas monitoring device 3 and gas relay 4 are located on one side of the riser body 1, and the pressure relief device 2 is located on the other side, ensuring that none of the components are obstructed vertically, facilitating inspection and maintenance, and resulting in a more rational layout.

[0028] In this embodiment, the gas monitoring device 3, gas relay 4, and the sensing components of the pressure relief device 2 can be connected to the same control module, which facilitates monitoring and control by maintenance personnel. The control scheme and connection method can adopt existing solutions on the market, which will not be elaborated here.

[0029] In this embodiment, the lifting seat body 1 is a cylindrical structure arranged vertically, the third interface 13 is arranged horizontally, and the diaphragm-type pressure relief mechanism 21 is a columnar structure connected to the third interface 13 horizontally, so that the horizontal columnar pressure relief component is directly connected to the horizontal third interface 13 of the cylinder, forming a vertical unobstructed airflow channel. During fault pressurization, high-temperature gas will be ejected radially along the lifting seat body 1. The orientation of the diaphragm-type pressure relief mechanism 21 is consistent with the airflow injection direction, thereby avoiding airflow deflection that could damage the equipment itself; and the diaphragm can face the airflow impact direction, with the pressure-bearing surface perpendicular to the airflow vector, resulting in a higher burst response speed and ensuring directional release.

[0030] In this embodiment, the pressure relief device 2 also includes a bracket 23. The two ends of the bracket 23 are respectively connected to the diaphragm-type pressure relief mechanism 21 and the lifting seat body 1, forming a triangular support structure with the diaphragm-type pressure relief mechanism 21 and the lifting seat body 1. This provides stable support for the horizontally arranged diaphragm-type pressure relief mechanism 21, and when the diaphragm-type pressure relief mechanism 21 is impacted, the lifting seat body 1 can be used as an anchor point to secure the diaphragm-type pressure relief mechanism 21, preventing it from becoming detached from the third interface 13 and causing an accident. The bracket 23 can be positioned above or below the diaphragm-type pressure relief mechanism 21 (in this embodiment, below), and is in the same vertical plane as the diaphragm-type pressure relief mechanism 21 to provide stronger and more reliable support in the direction of gravity of the diaphragm-type pressure relief mechanism 21. In this embodiment, the bracket 23 can be a commercially available adjustable telescopic rod, with both ends connected to the diaphragm-type pressure relief mechanism 21 and the lifting seat body 1 by a hinged connection.

[0031] In this embodiment, the oil guide pipe 22 includes a bent pipe 221, an inclined pipe 222, and a straight pipe 223 arranged sequentially from top to bottom. The bent pipe 221 is a pipe section that turns from the end of the diaphragm-type pressure relief mechanism 21 to a vertically downward direction. The straight pipe 223 is a vertical pipe section and is close to the riser body 1 and the oil tank 6 of the transformer where the explosion-proof riser is located relative to the bent pipe 221. It is located below the diaphragm-type pressure relief mechanism 21 and can be connected to the riser body 1 by a bracket structure. The inclined pipe 222 is connected between the bent pipe 221 and the straight pipe 223. The structure of the oil guide pipe 22 can, on the one hand, retract the pipe section that extends outward from the end of the diaphragm pressure relief mechanism 21 back inward, reducing the extra space occupied by the oil guide pipe 22; on the other hand, it allows the straight pipe 223 to fit closely to the riser body 1 and the transformer tank, which not only reduces the number of connecting parts such as the support structure, but also makes the overall structure more stable; and in the vertical plane where the diaphragm pressure relief mechanism 21 is located, the oil guide pipe 22 itself can also serve as a support mechanism covering the periphery of the support 23, further improving the stability of the diaphragm pressure relief mechanism 21.

[0032] In this embodiment, the third interface 13 is a conical oil guide port (or conical oil guide pipe) structure. The pressure relief device 2 also includes an isolation valve 24. The isolation valve 24 is a normally open valve, that is, it is in a normally open state during the operation of the converter transformer body. The isolation valve 24 is connected between the diaphragm pressure relief mechanism 21 and the third interface 13. A conventional isolation valve available on the market can be used according to specific usage requirements.

[0033] In this embodiment, the gas monitoring device 3 includes a single hydrogen online monitoring device 31 and a single acetylene gas online monitoring device 32, realizing online monitoring of the characteristic gases hydrogen and acetylene dissolved in transformer oil. Specifically, the single hydrogen online monitoring device 31 is used to monitor whether the hydrogen in the riser body 1 meets the set requirements, and the single acetylene gas online monitoring device 32 is used to monitor whether the acetylene in the riser body 1 meets the set requirements. These set requirements can be preset according to the specific working conditions of the transformer, and will not be elaborated here. The first interface 11 has two branches, which are respectively connected to the single hydrogen online monitoring device 31 and the single acetylene gas online monitoring device 32. Setting multiple branches can connect multiple devices while avoiding too many openings from affecting the riser body 1. The single hydrogen online monitoring device 31 is small in size and easy to install, so in this embodiment it is directly installed at the top of the riser body 1. Hydrogen is one of the important characteristic gases that reflect insulation defects inside the transformer, and the monitoring results of the single hydrogen online monitoring device 31 can quickly reflect sudden faults. The single acetylene gas online monitoring device 32 can be installed on the ground or in any other convenient location, and then connected to the first interface 11 via a cable (the label of the single acetylene gas online monitoring device 32 in the figure only indicates the location of the connection port, and the device itself is not shown). By monitoring the content and changes of acetylene gas online, the internal discharge fault of the transformer can be determined.

[0034] In this embodiment, the single hydrogen online monitoring device 31 includes a first connecting valve 312 and a rapid reaction gas content detection device 311. The rapid reaction gas content detection device 311 is used to monitor whether the hydrogen in the riser body 1 meets the set requirements. The first connecting valve 312 is a normally open valve, that is, it is in a normally open state during transformer operation. Generally, a DN25 ball valve can be selected. The first connecting valve 312 is connected between the rapid reaction gas content detection device 311 and the branch port of the first interface 11. A valve can also be installed between the single acetylene gas online monitoring device 32 and the other branch port of the first interface 11. Generally, a DN25 ball valve can be selected, which is in a normally open state during transformer operation (the rapid reaction gas content detection device 311 and the single acetylene gas online monitoring device 32 are both commercially available devices and will not be described in detail here).

[0035] In this embodiment, the gas relay 4 includes a relay body 42, a second connecting valve 41, and a control circuit module. The second connecting valve 41 is a normally open valve. The relay body 42 is connected to the second interface 12 through the second connecting valve 41 and is electrically connected to the control circuit module. When the pressure inside the riser body 1 exceeds a set value, the contacts of the relay body 42 actuate and connect the control circuit module. The control circuit module is used to issue an alarm signal and / or isolate the transformer where the explosion-proof riser is located from the power grid when connected. Specifically, the relay body 42 can be fixed to the top of the riser body 1 through the second connecting valve 41 and necessary support frame. The second connecting valve 41 is generally a DN50 ball valve, which is normally open during transformer operation. When an internal fault in the transformer causes oil decomposition to generate gas, resulting in oil flow impingement or a drop in oil level, the contacts of the relay body 42 will actuate, thereby connecting the designated control circuit, issuing an alarm signal in a timely manner, or automatically disconnecting the isolation transformer.

[0036] In this embodiment, the explosion-proof riser also includes a vacuum valve 5. The top of the riser body 1 is provided with a fourth interface 14. The vacuum valve 5 is a normally closed valve, connected to the fourth interface 14 and connected to an external vacuuming device, so as to vacuum the inside of the riser body 1 before oil injection or provide a vacuum for the riser body 1 during the oil injection stage, so as to facilitate vacuum oil injection of the riser body 1 and the converter transformer. It is normally closed during transformer operation.

[0037] In general, the explosion-proof riser in this embodiment is used for converter transformers and includes a riser body 1, a riser rapid pressure relief device 2, an oil guide pipe 22, a single hydrogen online monitoring device 31, a single acetylene gas online monitoring device 32, a riser gas relay 4, and a riser vacuum valve 5. The riser body 1 is bolted to the tank cover 6 of the converter transformer body; a bushing 7 is installed on the riser body 1. The riser body 1 is equipped with a rapid pressure relief device 2, and an oil guide pipe 22 is provided at the end of the rapid pressure relief device 2. The rapid pressure relief device 2 is usually located facing the outside of the converter transformer body and connected to the oil guide pipe 22. When a fault occurs inside the riser body 1, causing the rapid pressure relief device 2 to rapidly release pressure, the transformer oil inside the riser body 1 is discharged into the oil pool of the converter station. The top of the riser body 1 is equipped with interfaces for the single hydrogen online monitoring device 31 and the single acetylene gas online monitoring device 32, the riser gas relay 4, and the riser vacuum valve 5.

[0038] In this embodiment, the pressure relief device 2 rapidly relieves pressure and drains oil in the event of an internal fault in the riser seat. It also includes interfaces for a single hydrogen online monitoring device 31 and a single acetylene gas online monitoring device 32, enabling online monitoring of the characteristic gases hydrogen and acetylene dissolved in the transformer oil. A riser seat gas relay 4 is included to promptly issue an alarm signal or automatically disconnect the transformer in the event of a fault, thus effectively protecting the riser seat and the converter transformer. The riser seat integrates characteristic gas monitoring, signal output, rapid pressure relief, and oil drainage functions, effectively preventing riser seat explosions that could lead to converter transformer fires.

[0039] Example 2

[0040] The converter transformer in this embodiment includes an oil tank 6, a bushing 7, and an explosion-proof riser as described in Embodiment 1. The bottom end of the explosion-proof riser is connected to the tank cover of the oil tank 6, and the top end is connected to the bushing 7. An oil sump can also be installed on the ground of the converter station where the converter transformer is located to allow the oil drain pipe 22 to drain oil in case of a fault.

[0041] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. An explosion-proof riser base, characterized by: It includes a lifting seat body (1), a pressure relief device (2), a gas monitoring device (3), and a gas relay (4). The top of the lifting seat body (1) is provided with a first interface (11) and a second interface (12), and a third interface (13) is provided at the middle or upper part. The gas monitoring device (3) is connected to the first interface (11) and is used to monitor whether the gas inside the lifting seat body (1) meets the set requirements. The gas relay (4) is connected to the second interface (12) and is used to perform an alarm action when the pressure inside the lifting seat body (1) exceeds a set value. The pressure relief device (2) includes a diaphragm pressure relief mechanism (21) and an oil guide pipe (22). One end of the diaphragm pressure relief mechanism (21) is connected to the third interface (13), and the other end is led to the oil pool located below the third interface (13) through the oil guide pipe (22). It is used to discharge oil and air flow when the pressure in the lifting seat body (1) breaks the diaphragm.

2. The explosion-proof riser as claimed in claim 1, characterized in that: The lifting seat body (1) has a cylindrical structure arranged in the vertical direction, and the third interface (13) is arranged in the horizontal direction. The diaphragm-type pressure relief mechanism (21) has a columnar structure and is connected to the third interface (13) in the horizontal direction.

3. The explosion-proof riser of claim 2, wherein: The pressure relief device (2) also includes a bracket (23), the two ends of which are respectively connected to the diaphragm pressure relief mechanism (21) and the lifting seat body (1), forming a triangular support structure with the diaphragm pressure relief mechanism (21) and the lifting seat body (1).

4. The explosion-proof riser as claimed in claim 1 or 3, characterized in that: The oil guide pipe (22) includes a bent pipe (221), an inclined pipe (222), and a straight pipe (223) arranged sequentially from top to bottom. The bend (221) is a pipe section that turns from the end of the diaphragm-type pressure relief mechanism (21) to a vertically downward direction; The straight pipe (223) is a vertical pipe section and is close to the body of the riser (1) and the oil tank (6) of the transformer where the explosion-proof riser is located, relative to the bend (221), and is located below the diaphragm pressure relief mechanism (21); The inclined tube (222) is connected between the bent tube (221) and the straight tube (223).

5. The explosion-proof riser of claim 1, wherein: The pressure relief device (2) also includes an isolation valve (24), which is a normally open valve connected between the diaphragm pressure relief mechanism (21) and the third interface (13).

6. The explosion-proof riser of claim 1, wherein: The gas monitoring device (3) includes a single hydrogen online monitoring device (31) and a single acetylene gas online monitoring device (32). The single hydrogen online monitoring device (31) is used to monitor whether the hydrogen in the riser body (1) meets the set requirements, and the single acetylene gas online monitoring device (32) is used to monitor whether the acetylene in the riser body (1) meets the set requirements. The first interface (11) is provided with two branches, which are respectively connected to the single hydrogen online monitoring device (31) and the single acetylene gas online monitoring device (32).

7. The explosion-proof riser of claim 6, wherein: The single-hydrogen online monitoring device (31) includes a first connecting valve (312) and a fast reaction gas content detection device (311). The rapid reaction gas content detection device (311) is used to monitor whether the hydrogen content in the riser body (1) meets the set requirements. The first connecting valve (312) is a normally open valve, connected between the fast reaction gas content detection device (311) and the branch port of the first interface (11).

8. The explosion-proof riser of claim 1, wherein: The gas relay (4) includes a relay body (42), a second connecting valve (41), and a control circuit module. The second connecting valve (41) is a normally open valve. The relay body (42) is connected to the second interface (12) via the second connecting valve (41) and is electrically connected to the control circuit module. When the pressure inside the lifting seat body (1) exceeds a set value, the contacts of the relay body (42) activate and connect the control circuit module. The control loop module is used to issue an alarm signal and / or isolate the transformer where the explosion-proof riser is located from the power grid when it is turned on.

9. The explosion-proof riser of claim 1, wherein: It also includes a vacuum valve (5), The top of the lifting seat body (1) is provided with a fourth interface (14). The vacuum valve (5) is a normally closed valve, connected to the fourth interface (14) and connected to an external vacuum device to provide a vacuum for the lifting seat body (1) during the oil filling stage.

10. A converter transformer, characterized in that: Includes an oil tank (6), a sleeve (7), and an explosion-proof riser as described in any one of claims 1 to 9. The bottom end of the explosion-proof riser is connected to the tank cover of the oil tank (6), and the top end is connected to the sleeve (7).

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