A vacuum insulation device for an explosion-proof bushing riser of an oil-immersed device

Abstract

The application provides a vacuum insulation device for an explosion-proof bushing lifting seat of an oil-immersed device, which comprises a lifting seat body, a vacuum chamber, an explosion-proof diaphragm and a pressure relief mechanism, wherein the lifting seat body is provided with a lifting seat hand hole; the vacuum chamber is sleeved on the outer periphery of the lifting seat body, and an enclosed vacuum cavity is formed between the vacuum chamber and the lifting seat body; the vacuum chamber is provided with a pressure relief hole; the explosion-proof diaphragm is arranged at the lifting seat hand hole; and the pressure relief mechanism is arranged at the pressure relief hole. The application forms two layers of protection for the local extreme fault pressure of the lifting seat area through "isolation + relief", combustible gas can be isolated through the vacuum chamber, and relief can be achieved through the pressure relief mechanism. The double-layer protection reduces the risk of the explosion of the lifting seat after the high-energy electric arc discharge accident, and solves the problem that the existing lifting seat fault causes the mixing of high-temperature cracked oil gas and air, thereby causing explosion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of explosion-proof of oil-immersed equipment, in particular to a vacuum insulation device for explosion-proof bushing riser of oil-immersed equipment. BACKGROUND

[0002] The ultra-high voltage large oil-filled equipment plays an important role in power system to bear large energy electric energy conversion, and is one of the most important and most expensive equipment in the power system. When high-energy electric arc discharge fault occurs in the ultra-high voltage large oil-filled equipment, the equipment is prone to explosion and fire, causing serious property loss and personal injury.

[0003] At present, the research results show that the high-voltage ground short circuit, the outgoing line bushing ground short circuit and other faults are the most important reasons for causing explosion accidents, because the fault occurs near the riser, the riser has small volume, and the energy density in the closed space is extremely large, which is easy to cause bolt tearing and other structure failure problems under the impact of extreme fault energy, causing high-temperature cracking of oil gas and air mixture, resulting in explosion. SUMMARY

[0004] In view of this, the present application provides a vacuum insulation device for explosion-proof bushing riser of oil-immersed equipment, which aims to solve the problem that the existing riser fault causes high-temperature cracking of oil gas and air mixture, resulting in explosion.

[0005] The present application provides a vacuum insulation device for explosion-proof bushing riser of oil-immersed equipment, which comprises: a riser body, the riser body is provided with a riser hand hole; a vacuum chamber is sleeved on the outer periphery of the riser body, and a closed vacuum cavity is formed between the vacuum chamber and the riser body; the vacuum chamber is provided with a pressure relief hole; an explosion-proof diaphragm is arranged at the riser hand hole, which is used to break under the impact pressure when electric arc discharge fault occurs in the riser body or the part of the oil tank close to the riser body, the oil gas in the riser body flows into the closed vacuum cavity, the vacuum chamber isolates the high-temperature oil gas from the external combustible gas, and constitutes the first defense of electric arc discharge fault; a pressure relief mechanism is arranged at the pressure relief hole, which is used to release the high-temperature oil gas in the vacuum chamber when the surface pressure of the vacuum chamber reaches the relief threshold, and constitutes the second defense of electric arc fault.

[0006] Further, the vacuum insulation device for the explosion-proof bushing lifting seat of the oil-immersed equipment, the device further comprises: a data acquisition module, configured to acquire the current pressure and the current temperature of the inner wall surface of the vacuum chamber; a control module, connected with the data acquisition module and the pressure relief mechanism respectively, configured to receive the current pressure and the current temperature of the inner wall surface of the vacuum chamber acquired by the data acquisition module, and control the pressure relief mechanism based on the current pressure and the current temperature of the inner wall surface of the vacuum chamber.

[0007] Further, the vacuum insulation device for the explosion-proof bushing lifting seat of the oil-immersed equipment, the device further comprises: a state acquisition module, configured to acquire the pressure relief state of the pressure relief mechanism, the pressure relief state being a relief state or a non-relief state; the control module is connected with the state acquisition module, configured to control the pressure relief mechanism based on the current pressure and the current temperature of the inner wall surface of the vacuum chamber and in combination with the pressure relief state.

[0008] Further, the vacuum insulation device for the explosion-proof bushing lifting seat of the oil-immersed equipment, the device further comprises: a state acquisition module, configured to acquire the pressure relief state of the pressure relief mechanism, the pressure relief state being a relief state or a non-relief state; the control module is connected with the state acquisition module, configured to control the pressure relief mechanism based on the current pressure and the current temperature of the inner wall surface of the vacuum chamber and in combination with the pressure relief state.

[0009] Further, the vacuum insulation device for the explosion-proof bushing riser of the oil-immersed equipment, the pressure relief strategy is determined based on the relationship between the current pressure and the current temperature of the inner wall surface of the vacuum chamber and the preset temperature and the preset pressure, including: when the current pressure of the inner wall surface of the vacuum chamber is less than the preset pressure, and the current temperature of the inner wall surface of the vacuum chamber is less than the preset temperature, the pressure relief strategy is determined as a non-relief strategy; when the current pressure of the inner wall surface of the vacuum chamber is greater than or equal to the preset pressure, the pressure relief strategy is determined as a relief strategy; when the current temperature of the inner wall surface of the vacuum chamber is greater than or equal to the preset temperature, the pressure relief strategy is determined as a relief strategy; the control strategy for controlling the pressure relief mechanism is determined based on the pressure relief strategy and the pressure relief state, including: when the pressure relief strategy is a relief strategy and the pressure relief state is a non-relief state, the control strategy is to control the pressure relief mechanism to open, so that the pressure relief mechanism relieves the high-temperature oil gas in the vacuum chamber; when the pressure relief strategy is a non-relief strategy and the pressure relief state is a relief state, the control strategy is to control the pressure relief mechanism to close, so that the pressure relief mechanism stops relieving the high-temperature oil gas in the vacuum chamber.

[0010] Further, the vacuum insulation device for the explosion-proof bushing riser of the oil-immersed equipment, the top end of the vacuum chamber is flush with the top end of the riser body, and the bottom end of the vacuum chamber and the bottom end of the riser body are both arranged above the oil tank.

[0011] Further, the vacuum insulation device for the explosion-proof bushing riser of the oil-immersed equipment, the height of the vacuum chamber and the riser body is lower than the height of the oil pillow. When an arc discharge fault occurs at the riser body or the part of the oil tank close to the riser body, the oil gas in the riser body flows into the closed vacuum cavity, and the oil in the oil pillow flows into the riser body, so that the oil gas in the riser body is discharged from the riser body to the vacuum chamber.

[0012] Further, the vacuum insulation device for the explosion-proof bushing riser of the oil-immersed equipment, the top end of the vacuum chamber is connected with the top end of the riser body, and the bottom end of the vacuum chamber and the bottom end of the riser body are both connected with the oil tank.

[0013] Further, the vacuum insulation device for the explosion-proof bushing riser of the oil-immersed equipment, the riser body is an I-shaped straight cylinder riser, an H-shaped riser or an M-shaped riser.

[0014] Further, the vacuum insulation device for the explosion-proof bushing riser of the oil-immersed equipment, the vacuum chamber and the riser body are connected at the same potential.

[0015] The vacuum isolation device for the explosion-proof bushing riser of the oil-immersed equipment provided by the application comprises a vacuum chamber, an explosion-proof diaphragm and a pressure relief mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the application. Moreover, the same reference numerals are used throughout the drawings to represent similar components. In the drawings:

[0017] Figure 1 A structural schematic view of the vacuum isolation device for the explosion-proof bushing riser of the oil-immersed equipment provided by the embodiment of the application;

[0018] Figure 2 A top view of the vacuum isolation device for the explosion-proof bushing riser of the oil-immersed equipment provided by the embodiment of the application;

[0019] Figure 3 Another structural schematic view of the vacuum isolation device for the explosion-proof bushing riser of the oil-immersed equipment provided by the embodiment of the application;

[0020] Figure 4 Another structural schematic view of the vacuum isolation device for the explosion-proof bushing riser of the oil-immersed equipment provided by the embodiment of the application;

[0021] Figure 5 This is a structural block diagram of a vacuum isolation device for an explosion-proof sleeve riser for oil-immersed equipment, provided in an embodiment of the present invention. Detailed Implementation

[0022] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] See Figures 1 to 5 This figure illustrates a preferred structure of a vacuum isolation device for an explosion-proof sleeve riser for oil-immersed equipment, provided by an embodiment of the present invention. As shown, the vacuum isolation device for an explosion-proof sleeve riser for oil-immersed equipment includes: a riser body 1, a vacuum chamber 2, an explosion-proof diaphragm 4, and a pressure relief mechanism 5; wherein,

[0024] The lift seat body 1 is provided with a lift seat hand hole 11. Specifically, the lift seat body 1 is mounted on the oil tank 6, and the bottom end of the lift seat body 1 (relative to) Figure 1 (As shown in the diagram) It is connected to the oil tank 6, which can be connected by bolts or other connection methods; this embodiment does not impose any limitations on this connection. In this embodiment, the lifting seat body 1 is provided with a lifting seat handhole 11 for installing the explosion-proof diaphragm 4 to achieve sealing and discharge of oil and gas after explosion; other devices can also be installed thereon. The lifting seat body 1 may also be provided with a lifting seat manhole 12 so that construction personnel can enter the lifting seat body 1 for equipment installation and maintenance. There can be one or more lifting seat handholes 11 and lifting seat manholes 12, and their dimensions can be determined according to actual conditions; this embodiment does not impose any limitations on them. In this embodiment, as... Figure 1 , Figure 3 and Figure 4 The lifting seat body 1 is an I-type straight cylindrical lifting seat, an H-type lifting seat, or an M-type lifting seat. Of course, the lifting seat body 1 can also be other structures, and no limitation is made on it in this embodiment.

[0025] The vacuum chamber 2 is sleeved on the outer periphery of the riser body 1, and the vacuum chamber 2 and the riser body 1 form an enclosed vacuum cavity 3. The vacuum chamber 2 is provided with a pressure relief hole 21. Specifically, the vacuum chamber 2 is sleeved on the outer periphery of the riser body 1, and the top end of the vacuum chamber 2 is flush with the top end of the riser body 1, and the bottom end of the vacuum chamber 2 and the bottom end of the riser body 1 are both arranged above the oil tank 6. In this embodiment, as shown in Figure 2 the top end of the vacuum chamber 2 can be connected to the top end of the riser body 1 through a top connecting structure 22, and the bottom end of the vacuum chamber 2 can be connected to the bottom end of the riser body 1 through a bottom connecting structure 23, so that the vacuum chamber 2 and the riser body 1 form an enclosed vacuum cavity 3. The top connecting structure 22 and / or the bottom connecting structure 23 can be welded to connect, or can be connected by other connection methods such as bolts. After the vacuum chamber 2 is installed and connected, vacuumization can be performed to ensure that the pressure in the vacuum chamber 2 is reduced to below Pa level, and the vacuum chamber 2 is an independent vacuum area without air, transformer oil and other fluids, and does not contact the internal insulating oil of the transformer and the air outside the vacuum chamber. In this embodiment, the vacuum chamber 2 can also be provided with a vacuum chamber manhole 24, so that the construction personnel can enter the vacuum chamber 2 to install and maintain the equipment, and the vacuum chamber manhole 24 can be one or more. The vacuum chamber 2 can be a large vacuum container outside the riser.

[0026] The explosion-proof diaphragm 4 is arranged at the riser hand hole 11, and when an arc discharge fault occurs at the riser body 1 or the oil tank 6 close to the riser body 1, the explosion-proof diaphragm 4 is broken under the impact pressure, the oil gas in the riser body 1 rushes into the enclosed vacuum cavity 3, and the vacuum chamber 2 isolates the high-temperature oil gas from the external combustible gas, thereby constituting the first defense of the arc discharge fault. Specifically, the explosion-proof diaphragm 4 is installed at the riser hand hole 11 and can be one or more. The explosion-proof diaphragm 4 and the riser body 1 can be connected by bolts or other connection methods. When an arc discharge fault occurs at the riser body 1 or the oil tank 6 close to the riser body 1, one or more explosion-proof diaphragms 4 on the surface of the riser body 1 are broken by the sharply rising pressure, the oil gas in the riser body 1 rushes into the enclosed vacuum cavity 3, and the oil gas is discharged, at the same time, the vacuum chamber 2 can isolate the high-temperature oil gas from the combustible gas, i.e. the oxygen in the air, thereby avoiding the occurrence of explosion and constituting the first defense of the high-energy arc fault. The explosion-proof diaphragm 4 can be an arch-shaped explosion-proof diaphragm.

[0027] The pressure relief mechanism 5 is arranged at the pressure relief hole 21, and is used to release the high-temperature oil gas in the vacuum chamber when the surface pressure of the vacuum chamber reaches a relief threshold value, and to constitute a second defense for arc fault. Specifically, the pressure relief mechanism 5 can be a spring type pressure relief device, a diaphragm type pressure relief device, or a valve diaphragm integrated pressure relief device. When there are multiple pressure relief mechanisms 5, each of the multiple pressure relief mechanisms 5 can be one of the spring type pressure relief device, the diaphragm type pressure relief device, or the valve diaphragm integrated pressure relief device, or a combination of two or more thereof. The vacuum chamber 2 and the pressure relief mechanism 5 can be connected by bolts or other connection methods. As the pressure in the riser body 1 continues to rise, oil gas continuously flows into the closed vacuum cavity 3 from the riser body 1. When the vacuum chamber 2 is filled, the pressure is transmitted to the surface of the vacuum chamber 2. When the pressure of the pressure relief mechanism 5 on the surface of the vacuum chamber 2 reaches the relief threshold value, i.e., the action threshold value, the pressure relief mechanism 5 reliably acts to release the oil gas, complete the secondary pressure relief, and constitute a second defense for high-energy arc fault. The “isolation + relief” constitutes two layers of protection for the local extreme fault pressure in the riser area.

[0028] Continuing to refer to Figure 1 , Figure 3 and Figure 4 , the vacuum chamber 2 and the riser body 1 are connected in an equipotential manner. Specifically, the vacuum chamber 2 and the riser body 1 are connected in an equipotential manner, so that they are at the same potential, thereby preventing a potential difference between them and avoiding a field strength therebetween. If there is a field strength between the vacuum chamber 2 and the riser body 1, the impurities in the closed vacuum cavity 3 will move along the direction of the field strength, forming a “small impurity bridge”. Therefore, connecting the vacuum chamber 2 and the riser body 1 in an equipotential manner can avoid the occurrence of the “small impurity bridge” situation. The vacuum chamber 2 and the riser body 1 can be connected in an equipotential manner by a metal strip 7. The metal strip 7 can be a metal soft strip structure or other structures, which is not limited in the embodiment.

[0029] In the embodiment, the explosion-proof diaphragm 4 can include a rupture disc, a holder, and a detection unit. The holder is used to hold the rupture disc, so that the rupture disc is fixed to the riser handhole 11. The detection unit is used to sense the diaphragm state and non-electric quantity information of the rupture disc. The non-electric quantity information can include pressure, temperature, etc.

[0030] In the embodiment, the height of the vacuum chamber 2 and the elevated seat body 1 is lower than the height of the oil pillow. When the electric arc discharge fault occurs in the elevated seat body 1 or the oil tank 6 close to the elevated seat body 1, the oil gas in the elevated seat body 1 flows into the closed vacuum chamber 3, and the oil in the oil pillow can flow into the elevated seat body 1, which is beneficial to the discharge of the oil gas in the elevated seat body 1 to the vacuum chamber 2. Specifically, as long as the oil amount in the oil pillow is ensured, when the electric arc discharge fault occurs in the elevated seat body 1 or the oil tank 6 close to the elevated seat body 1, the oil in the oil pillow can quickly fill the elevated seat body 1, and the height of the oil pillow higher than the vacuum chamber 2 is beneficial to the discharge of the high-temperature oil gas from the elevated seat body 1 to the vacuum chamber 2.

[0031] In the embodiment, the pressure relief mechanism 5 is a mechanical moving component which moves with the change of the pressure in the vacuum chamber 2. However, the pressure relief mechanism 5 can have a false action, which causes the unstable pressure relief action in the vacuum chamber 2. To solve the problem of the unstable pressure relief action in the vacuum chamber 2, preferably, the vacuum chamber 2 is provided with a data acquisition module 8 for acquiring the current pressure and the current temperature of the inner wall surface of the vacuum chamber 1. Specifically, the data acquisition module 8 can also acquire the oil flow velocity of the surface and the surrounding area of the vacuum chamber. In the embodiment, the data acquisition module 8 can include a pressure sensor, an oil flow velocity sensor and a temperature sensor for monitoring the pressure value, the oil flow velocity and the temperature value of the surface and the surrounding area of the vacuum chamber 2, respectively, and then controlling the pressure relief mechanism 5 based on the acquired data, which can effectively prevent the false action of the pressure relief mechanism 5 on the vacuum chamber 2.

[0032] Continuing to refer to Figure 5 , the data acquisition module 8 can be connected with a control module 9 which is connected with the data acquisition module 8 and the pressure relief mechanism 5, respectively, for receiving the current pressure and the current temperature of the inner wall surface of the vacuum chamber 2 acquired by the data acquisition module 8, and controlling the pressure relief mechanism 5 based on the current pressure and the current temperature of the inner wall surface of the vacuum chamber 2, so as to prevent the false action of the pressure relief mechanism 5. Specifically, the control module 9 can monitor the pressure relief mechanism 5 based on the current pressure and the current temperature of the inner wall surface of the vacuum chamber 2 acquired by the data acquisition module 8, which can avoid the false action of the pressure relief mechanism 5 and ensure the stability of the pressure relief mechanism 5.

[0033] In the embodiment, the pressure relief mechanism 5 can also be provided with a state acquisition module 10 for acquiring the pressure relief state of the pressure relief mechanism 5, which is a relief state or a non-relief state. The control module 8 is connected with the state acquisition module 10 for controlling the pressure relief mechanism 5 based on the current pressure and the current temperature of the inner wall surface of the vacuum chamber 2 and in combination with the pressure relief state. Specifically, the control of the pressure relief mechanism 5 based on the current pressure and the current temperature of the inner wall surface of the vacuum chamber 2 and in combination with the pressure relief state includes:

[0034] set a preset temperature and a preset pressure; wherein the preset pressure is greater than a relief threshold; wherein the relief threshold can be 0.2 MPa, or other pressure values, which are not limited in the embodiment; the preset temperature can be 2000℃, or other temperature values, which are not limited in the embodiment.

[0035] determine a pressure relief strategy based on the relationship between the current pressure and the current temperature of the inner wall surface of the vacuum chamber and the preset temperature and the preset pressure;

[0036] determine a control strategy for controlling the pressure relief mechanism based on the pressure relief strategy and the pressure relief state.

[0037] Specifically, the pressure relief strategy is determined based on the relationship between the current pressure and the current temperature of the inner wall surface of the vacuum chamber and the preset temperature and the preset pressure, including:

[0038] when the current pressure of the inner wall surface of the vacuum chamber is less than the preset pressure, and the current temperature of the inner wall surface of the vacuum chamber is less than the preset temperature, the pressure relief strategy is determined as a non-relief strategy;

[0039] when the current pressure of the inner wall surface of the vacuum chamber is greater than or equal to the preset pressure, the pressure relief strategy is determined as a relief strategy;

[0040] when the current temperature of the inner wall surface of the vacuum chamber is greater than or equal to the preset temperature, the pressure relief strategy is determined as a relief strategy;

[0041] determine a control strategy for controlling the pressure relief mechanism based on the pressure relief strategy and the pressure relief state, including:

[0042] when the pressure relief strategy is a relief strategy and the pressure relief state is a non-relief state, the control strategy is to control the pressure relief mechanism to open, so that the pressure relief mechanism relieves the high-temperature oil gas in the vacuum chamber;

[0043] when the pressure relief strategy is a non-relief strategy and the pressure relief state is a relief state, the control strategy is to control the pressure relief mechanism to close, so that the pressure relief mechanism stops relieving the high-temperature oil gas in the vacuum chamber.

[0044] It can be known that when the pressure relief mechanism 5 acts with the change of the pressure in the vacuum chamber 2, the current state of the pressure relief mechanism 5, i.e. the pressure relief state, can be obtained through the state acquisition module 10; and the pressure relief strategy, i.e. the state that the pressure relief mechanism 5 should be in, can be determined based on the data collected by the data acquisition module 8 based on the control module 9; if the state that the pressure relief mechanism 5 should be in is inconsistent with the current state of the pressure relief mechanism 5, the pressure relief mechanism 5 is controlled based on the state that the pressure relief mechanism 5 should be in, so that the pressure relief mechanism 5 acts to keep consistent with the pressure relief strategy, thereby ensuring the stability of the pressure relief in the vacuum chamber 2.

[0045] Of course, the elevated seat body 1 can also be provided with a data acquisition unit to collect data of the pressure and temperature of the inner surface of the elevated seat body 1, and then monitor the explosion-proof diaphragm 4 based on the collected pressure and temperature. The monitoring method can refer to the monitoring method of the pressure relief mechanism 5, which will not be described here in this embodiment.

[0046] In summary, the vacuum isolation device for the explosion-proof bushing elevated seat of the oil-immersed equipment provided in the embodiment is provided with the vacuum chamber 2 sleeved on the outer periphery of the elevated seat body 1, and an enclosed vacuum cavity is formed between the vacuum chamber 2 and the elevated seat body 1. When an electric arc discharge fault occurs in the elevated seat body 1 or the oil tank 6 close to the elevated seat body 1, the explosion-proof diaphragm 4 breaks under the impact pressure, and the oil gas in the elevated seat body 1 rushes into the enclosed vacuum cavity 3, the vacuum chamber 2 isolates the high-temperature oil gas from the external combustible gas, avoiding the occurrence of deflagration accidents, constituting the first defense of the electric arc discharge fault. With the continuous rise of the pressure in the elevated seat body 1, the oil gas continuously rushes into the enclosed vacuum cavity 3 from the elevated seat body 1, and when the vacuum chamber 2 is full, the pressure is transmitted to the surface of the vacuum chamber 2. When the pressure of the pressure relief mechanism 5 on the surface of the vacuum chamber 2 reaches the relief threshold, i.e. the action threshold, the pressure relief mechanism 5 reliably acts to realize oil gas relief, complete the secondary relief of the pressure, and constitute the second defense of the high-energy electric arc fault. The "isolation + relief" constitutes two layers of protection for the local extreme fault pressure in the elevated seat area. The vacuum isolation device constitutes two layers of protection for the local extreme fault pressure in the elevated seat area through "isolation + relief". The combustible gas can be isolated by the vacuum chamber 2, and the relief can be realized by the pressure relief mechanism 5. The double-layer protection reduces the risk of fire of the elevated seat caused by deflagration after the high-energy electric arc discharge accident, and solves the problem of mixing of high-temperature cracked oil gas and air caused by the fault of the existing elevated seat, which leads to deflagration.

[0047] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is merely for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0048] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A vacuum insulation device for an explosion-proof bushing riser of an oil-immersed device, characterized in that, The device comprises: a lifting seat body, which is provided with a lifting seat hand hole; a vacuum chamber, which is sleeved on the outer periphery of the lifting seat body, and a closed vacuum cavity is formed between the vacuum chamber and the lifting seat body; the vacuum chamber is provided with a pressure relief hole; an explosion-proof diaphragm, which is arranged at the lifting seat hand hole, and is ruptured under impact pressure when an electric arc discharge fault occurs at the lifting seat body or a part of the oil tank close to the lifting seat body, so that oil gas in the lifting seat body flows into the closed vacuum cavity, the vacuum chamber isolates high-temperature oil gas from external combustible gas, and the first defense against electric arc discharge fault is formed; a pressure relief mechanism, which is arranged at the pressure relief hole, and is actuated when the surface pressure of the vacuum chamber reaches a relief threshold value when the vacuum chamber is filled with high-temperature oil gas, so as to relieve the high-temperature oil gas in the vacuum chamber, and the second defense against electric arc fault is formed.

2. The vacuum insulation arrangement for an oil-immersed apparatus explosion-proof bushing riser according to claim 1, characterized in that, Further comprising: a data acquisition module, which is used to acquire the current pressure and current temperature of the inner wall surface of the vacuum chamber; a control module, which is connected with the data acquisition module and the pressure relief mechanism respectively, and is used to receive the current pressure and current temperature of the inner wall surface of the vacuum chamber acquired by the data acquisition module, and control the pressure relief mechanism based on the current pressure and current temperature of the inner wall surface of the vacuum chamber.

3. The vacuum insulation arrangement for an oil-immersed apparatus explosion-proof bushing riser according to claim 2, characterized in that, Further comprising: a state acquisition module, which is used to acquire the pressure relief state of the pressure relief mechanism, and the pressure relief state is a relief state or a non-relief state; the control module is connected with the state acquisition module, and is used to control the pressure relief mechanism based on the current pressure and current temperature of the inner wall surface of the vacuum chamber and in combination with the pressure relief state.

4. The vacuum isolation device for the explosion-proof bushing lifting seat of the oil-immersed equipment according to claim 3, characterized in that the control of the pressure relief mechanism based on the current pressure and current temperature of the inner wall surface of the vacuum chamber and in combination with the pressure relief state comprises: setting a preset temperature and a preset pressure; wherein the preset pressure is greater than the relief threshold value; determining a pressure relief strategy based on the relationship between the current pressure and current temperature of the inner wall surface of the vacuum chamber and the preset temperature and preset pressure respectively; determining a control strategy for controlling the pressure relief mechanism based on the pressure relief strategy and the pressure relief state.

5. The vacuum isolation device for the explosion-proof bushing lifting seat of the oil-immersed equipment according to claim 4, characterized in that the determination of the pressure relief strategy based on the relationship between the current pressure and current temperature of the inner wall surface of the vacuum chamber and the preset temperature and preset pressure respectively comprises: when the current pressure of the inner wall surface of the vacuum chamber is less than the preset pressure, and the current temperature of the inner wall surface of the vacuum chamber is less than the preset temperature, determining that the pressure relief strategy is a non-relief strategy; when the current pressure of the inner wall surface of the vacuum chamber is greater than or equal to the preset pressure, determining that the pressure relief strategy is a relief strategy. When the current temperature of the inner wall surface of the vacuum chamber is greater than or equal to the preset temperature, the pressure relief strategy is determined as a relief strategy; The control strategy for controlling the pressure relief mechanism is determined based on the pressure relief strategy and the pressure relief state, and the control strategy comprises: When the pressure relief strategy is the relief strategy and the pressure relief state is the non-relief state, the control strategy is to control the pressure relief mechanism to open, so that the pressure relief mechanism relieves the high-temperature oil gas in the vacuum chamber; When the pressure relief strategy is the non-relief strategy and the pressure relief state is the relief state, the control strategy is to control the pressure relief mechanism to close, so that the pressure relief mechanism stops relieving the high-temperature oil gas in the vacuum chamber.

6. The vacuum isolation device for the explosion-proof bushing lifting seat of the oil-immersed equipment according to any one of claims 1 to 5, characterized in that: the top end of the vacuum chamber is flush with the top end of the lifting seat body, and the bottom end of the vacuum chamber and the bottom end of the lifting seat body are both arranged above the oil tank.

7. The vacuum isolation device for the explosion-proof bushing lifting seat of the oil-immersed equipment according to claim 6, characterized in that: the height of the vacuum chamber and the lifting seat body is lower than the height of the oil pillow, when an arc discharge fault occurs at the lifting seat body or the part of the oil tank close to the lifting seat body, the oil gas in the lifting seat body flows into the closed vacuum cavity, the oil of the oil pillow flows into the lifting seat body, and the oil gas in the lifting seat body is relieved from the lifting seat body to the vacuum chamber.

8. The vacuum isolation device for the explosion-proof bushing lifting seat of the oil-immersed equipment according to claim 6, characterized in that: the top end of the vacuum chamber is connected with the top end of the lifting seat body, and the bottom end of the vacuum chamber and the bottom end of the lifting seat body are both connected with the oil tank.

9. Vacuum insulation arrangement for oil-immersed apparatus explosion-proof bushing riser according to any of claims 1 to 5, characterized in that The lifting seat body is an I-shaped straight cylinder lifting seat, an H-shaped lifting seat or an M-shaped lifting seat.

10. Vacuum insulation arrangement for an oil-immersed apparatus explosion- proof bushing riser according to any one of claims 1 to 5, characterized in that, The vacuum chamber and the lifting seat body are connected in equal potential.

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