Inflatable lightning impulse high-voltage generator

Abstract

The invention relates to the technical field of breakdown voltage testing, in particular to an inflatable lightning impulse high-voltage generator which comprises a tank body, a high-voltage generator installed in the tank body through an insulating support and a balancing device used for ventilation and pressure balancing, and the high-voltage generator is used for charging and discharging in an external pulse mode; the balancing device comprises a balancing air bag and a constant-pressure container, the balancing air bag is communicated with the interior of the tank body and is in a contraction state, the constant-pressure container is arranged in the tank body, the balancing air bag is located in the constant-pressure container, and the constant-pressure container is communicated with a plurality of pressurizing assemblies which face the constant-pressure container and pressurize the constant-pressure container through volume elastic expansion and contraction; the volume expansion pressure of the balance air bag is larger than the preset pressure of the tank body and smaller than the peak pressure of the tank body after discharging. According to the invention, the pressure is maintained through the carbon expansion of the balance air bag within a certain pressure range, and the SF6 or SF6 / N2 mixed gas in the gaps of the small balls is replaced, so that the insulation performance of the SF6 or SF6 / N2 mixed gas after discharging is optimized, and the influence of the fluctuation of the test voltage on the test result is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of breakdown voltage test technology, and in particular to an inflatable lightning impulse high-voltage generator. BACKGROUND

[0002] The impulse voltage generator is mainly used for lightning impulse of power equipment, insulating materials and other test samples, and is used for testing the insulation level of lightning impulse withstand voltage of the test sample. The impulse voltage is usually generated by the impulse voltage generator, and the mainstream impulse voltage generator is mostly open type, which uses air as the insulating medium. However, since air is mixed with various gases and contains a certain amount of moisture, the air has low resistance strength in high-voltage impact experiments, and is greatly affected by environmental factors, which affects the reliability of the equipment.

[0003] In order to optimize the reliability of the equipment, in the prior art, an inflatable lightning impulse high-voltage generator is used to ensure the purity, flow speed and stability of the gas around the impulse voltage generator during the experiment by means of insulation cylinder and / or armored inflation. In the prior art, SF6 or SF6 / N2 mixed gas is often used as the insulating medium.

[0004] However, in the actual use process, the high energy of the impulse type high-voltage discharge will cause the dissociation of SF6 molecules to generate low fluorosulfide (such as SF4, SF2, etc.) and free radicals (such as F·). Even if there is a trace amount of H2O or O2 in the gas, SO2F2, SOF2, SO2, HF, H2S and other toxic and corrosive products will be further generated, and high temperature will be generated at the same time, which greatly affects the insulation performance of SF6 or SF6 / N2 mixed gas. Therefore, in the process of pulse type high-voltage discharge, optimizing the stability of the insulating gas is a problem that needs to be solved for the current closed structure high-voltage generator. SUMMARY

[0005] In order to optimize the stability of the insulating gas in the process of pulse type high-voltage discharge, the present application provides an inflatable lightning impulse high-voltage generator.

[0006] The inflatable lightning impulse high-voltage generator provided by the present application adopts the following technical scheme: The application discloses an inflatable lightning impact high-voltage generator, which comprises a tank body, a high-voltage generator installed in the tank body through an insulating support and used for pulse charging and discharging towards the outside, and a balancing device used for air exchange and pressure balancing, wherein the balancing device comprises a balancing air bag communicated with the inside of the tank body and in a contracted state and a constant-pressure container arranged on the tank body, the balancing air bag is located in the constant-pressure container, the constant-pressure container is communicated with a plurality of pressurizing components which are pressurized through volume elastic expansion towards the constant-pressure container, and the volume expansion pressure of the balancing air bag is greater than the preset pressure of the tank body and smaller than the peak pressure after discharging of the tank body.

[0007] By adopting the technical scheme, after high-voltage discharging, SF6 or SF6 / N2 mixed gas is dissociated and the temperature is increased, so that the pressure and the temperature are increased, at this time, the balancing air bag simultaneously feeds back pressure to the plurality of pressurizing components through the air in the constant-pressure container, compared with the spring and piston in the prior art, the pressure is directly regulated through the contraction of the spring, a small deformation of the plurality of pressurizing components can realize a large volume change, and the pressure change applied to the balancing air bag is relatively stable and in a small range, compared with the slow pressure relief through the expansion and contraction of the air bag made of elastic material, since the pressure is suddenly increased, the required expansion volume is large, the resistance of the expansion is large, the pressure peak is increased, and the test precision is affected, but the application can effectively maintain the SF or SF / N mixed gas in a suitable working pressure range, and the pressure is not rapidly changed and exceeds the reasonable range. Meanwhile, since the external gas flows towards the outside, the air in the small ball gap can be directly replaced due to the flow of the gas after the pressure change, so as to avoid affecting the insulation performance of the SF or SF / N mixed gas in the next discharge period and reducing the test result precision; the balancing air bag is in a contracted state, the resistance is relatively small during volume expansion, so that the pressure can be relieved in time and maintained, and the temperature change of the small ball gap is reduced through the flow of the gas, and the stability of the insulation gas is optimized.

[0008] Optionally, the pressurizing component comprises a pressurizing pipe fixed to the constant-pressure container, an elastic pipe fixed to and communicated with the inside of the constant-pressure container, and a pressurizing piece used for axially compressing the pressurizing elastic pipe along the pressurizing pipe, and the pressurizing elastic pipe is coaxially arranged in the pressurizing pipe.

[0009] By adopting the technical scheme, when the balancing air bag is expanded, the air in the constant-pressure container applies pressure to the elastic pipe, and the elastic pipe pushes back the pressurizing piece, so that the elastic pipe can be expanded along the pressurizing pipe to realize pressure buffering and pressure maintaining.

[0010] Optionally, the pressurizing elastic pipe is fixed with a pressure seat which is slidably arranged in the pressurizing pipe at one end away from the constant-pressure container, and the pressurizing pipe is provided with a limiting structure used for limiting the sliding pressurization of the pressure seat towards the constant-pressure container.

[0011] By adopting the technical scheme, the situation that the pressure in the constant pressure container exceeds the limit due to the transition pressurization of the pressurizing member is avoided.

[0012] Optionally, the pressurizing member is a constant pressure spring or a cylinder.

[0013] By adopting the technical scheme, the resistance of the elastic tube during expansion is relatively stable.

[0014] Optionally, the balancing air bag or the tank body is communicated with an extracting member for extracting the insulation gas, and the tank body is provided with an input member for replacing the gas in cooperation with the extracting member in the initial charging stage.

[0015] By adopting the technical scheme, the SF or SF / N mixed gas can be replaced after a relatively long charging period or after a plurality of long time tests, so as to ensure the cleanliness and insulation performance of the SF or SF / N mixed gas.

[0016] Optionally, the tank body is internally provided with a spoiler pipe made of insulation material, and the high-voltage generator is located inside the spoiler pipe.

[0017] By adopting the technical scheme, since the increase of the pressure after discharge and the expansion of the balancing air bag will both cause the flow of the SF or SF / N mixed gas, the spoiler pipe arranged around the high-voltage generator can significantly limit the flow of the SF or SF / N mixed gas inside and outside the tank body, so as to avoid the situation that the flow causes the non-uniform electric field during the next high-voltage discharge.

[0018] Optionally, the spoiler pipe is at least externally provided with a limiting assembly, and the limiting assembly is at least used for limiting the flow of air after gas replacement.

[0019] By adopting the technical scheme, the flow of the SF or SF / N mixed gas at least outside the spoiler pipe can be further limited, and the gas flow caused by the pressure maintenance and replacement of the SF or SF / N mixed gas is further reduced.

[0020] Optionally, the limiting assembly comprises a plurality of limiting pieces rotationally connected to the spoiler pipe and a control member for controlling the rotation of the limiting pieces, and the limiting pieces in the same group are arranged around the spoiler pipe.

[0021] By adopting the technical scheme, whether SF or SF / N mixed gas is replaced, SF or SF / N mixed gas flows in the tank body, and the flow of the gas causes unevenness of the gap electric field between the pellets, so that when the several limiting pieces in the same group are parallel and overlapped, the resistance of the SF or SF / N mixed gas flowing outside the turbulence tube is significantly increased, so that the inside and outside of the turbulence tube are separated, and the SF or SF / N mixed gas in the tank body can relatively quickly reduce the flow speed; and when the SF or SF / N mixed gas is replaced, the limiting pieces can be parallel to the turbulence tube to reduce the interference with the flow of the SF or SF / N mixed gas and avoid the case that the gas containing the SF or SF / N mixed gas after discharge decomposes impurities.

[0022] Optionally, projections of the limiting pieces in the same group along the axial direction of the tank body are annular.

[0023] By adopting the technical scheme, at least the flow of the SF or SF / N mixed gas outside the turbulence tube can be significantly reduced.

[0024] In summary, the present application has at least one of the following beneficial technical effects: In use, after high-voltage discharge, SF6 or SF6 / N2 mixed gas dissociates and the temperature rises, which increases the pressure and the temperature, at this time the balance air bag simultaneously feeds back the pressure in the constant pressure container to the plurality of pressurizing assemblies, compared with the spring and piston used in the pressure regulating valve in the prior art, which directly realizes pressure regulation by contraction of the spring, a small amount of deformation of the plurality of pressurizing assemblies can realize a large volume change, and the pressure change applied to the balance air bag is relatively stable and in a small range, compared with the slow pressure relief by the air bag made of elastic material, since the pressure increases suddenly, the required inflation volume is large, and the greater the volume, the greater the inflation resistance, which causes the pressure peak to rise and affects the test accuracy, and the present application can effectively maintain the SF or SF / N mixed gas in a suitable working pressure range, and the pressure does not change rapidly and exceed the reasonable range. Since the external gas flows outward, the air in the pellet gap can be directly replaced due to the flow of the gas after the pressure change, so as to avoid affecting the insulation performance of the SF or SF / N mixed gas in the next discharge period and causing the test result accuracy to decrease; and the balance air bag is in a contracted state, and the resistance is relatively small when the volume expands, so as to be able to timely slow down the pressure and maintain the pressure, and reduce the temperature change of the pellet gap by the flow of the gas, and optimize the stability of the insulation gas. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a sectional view of the present embodiment.

[0026] Figure 2 Fig. 1 is a schematic diagram of a partial cross-sectional structure of a balancing device according to an embodiment of the present application.

[0027] Figure 3 Fig. 2 is a schematic diagram of a structure of a pressurizing assembly according to an embodiment of the present application.

[0028] Figure 4 Fig. 3 is a schematic diagram of a cross-sectional structure of a limiting assembly and a tank according to an embodiment of the present application.

[0029] Reference signs: 1, tank; 10, connecting flange pipe; 11, insulating support; 12, extraction member; 13, input member; 14, turbulence pipe; 15, charging transformer; 2, high-voltage generator; 21, high-voltage output pipe; 22, segmental shielding ring; 3, balancing device; 31, balancing air bag; 32, constant-pressure container; 33, pressurizing assembly; 331, pressurizing pipe; 332, pressurizing elastic pipe; 333, pressurizing member; 334, pressure seat; 335, limiting structure; 4, limiting assembly; 41, limiting sheet; 42, control member. DETAILED DESCRIPTION

[0030] The following will be described in detail with reference to the accompanying drawings. Figures 1-4 The present application will be described in further detail.

[0031] The high-voltage generator 2 is a multi-stage gas-insulated impulse voltage generator of the prior art, which includes a high-voltage output pipe 21, a discharge sphere air cavity, and a weak damping voltage divider supported on a tank. Each stage of the multi-stage gas-insulated impulse voltage generator includes an impulse voltage main circuit, and a segmental shielding ring 22. The impulse voltage main circuit includes a wave-modulating element, a pulse capacitor, a charging resistor, and a small sphere gap. The wave-modulating element, the pulse capacitor, the charging resistor, and the segmental shielding ring 22 are installed on four insulating supports to form a multi-stage circuit. The segmental shielding ring 22 is installed at the connection part of the four insulating supports and the wave-modulating element, the pulse capacitor, and the charging resistor.

[0032] Each stage of the multi-stage gas-insulated impulse voltage generator includes an impulse voltage main circuit (wave-modulating element, pulse capacitor, charging resistor, and small sphere gap) fixed on four insulating supports to form a multi-stage circuit, and a segmental shielding ring 22 arranged at the connection part of each stage of the four insulating supports, so that the field strength at each point is close to that of a uniform electric field, and discharge phenomenon is not easily generated. The small sphere gap of each stage is sealed in a discharge sphere air cavity, and the small sphere gap realizes discharge of impulse voltage through linear motion. The small sphere gap is located at the middle position of two insulating supports and is connected in series with the wave-modulating element and the charging resistor through a soft wire. SF or SF / N mixed gas at 0.4 MPa to 0.6 MPa is filled into the tank 1. The last stage of the multi-stage gas-insulated impulse voltage generator and the weak damping voltage divider jointly output impulse voltage through a flat plate type voltage grading shield and a high-voltage output pipe.

[0033] The embodiment of the present application discloses an inflatable lightning impact high-voltage generator. Referring to Figure 1 and Figure 2 , the inflatable lightning impact high-voltage generator comprises a tank body 1, a high-voltage generator 2 and a balancing device 3. The segmental shielding ring 22 of the high-voltage generator 2 is installed on the inner wall of the tank body 1 through an insulating support 11, and the high-voltage output pipe 21 of the high-voltage generator 2 is connected to the outside along the axial direction of the tank body 1 through the tank body 1 for high-voltage discharge in a pulse mode towards the outside, simulating lightning impact. Wherein, a loop air cavity is formed between the tank body 1 and the discharge sphere air cavity; the charging transformer 15 is placed outside the tank body 1 and is isolated from the loop air cavity.

[0034] Referring to Figure 2 and Figure 3 , the balancing device 3 comprises a balancing air bag 31 and a constant pressure container 32, the balancing air bag 31 is made of elastic and high-voltage resistant material, such as fluorosilicone rubber, silicone rubber, etc. The side wall of the tank body 1 is provided with a connecting flange pipe 10 for connecting the balancing air bag 31, the connecting flange pipe 10 is communicated with the inside of the tank body 1, and the opening edge of the balancing air bag 31 is fixedly connected to the connecting flange pipe 10, so that the balancing air bag 31 can be connected and communicated with the inside of the tank body 1. Wherein, the opening edge of the balancing air bag 31 is clamped by the connecting flange pipe 10 through a ring-shaped sealing ring and is fastened by bolts or clamps, so as to realize detachable connection.

[0035] Referring to Figure 2 and Figure 3The opening edge of the constant pressure container 32 is fixed to the outer wall of the tank body 1, and the outer wall of the constant pressure container 32 is provided with a plurality of pressurizing assemblies 33 for applying a predetermined pressure to the balancing air bag 31, so that the balancing air bag 31 remains in a contracted state. At the same time, the pressure applied by the pressurizing assembly 33 is L, the preset pressure of the tank body 1 is L2, that is, the optimal working pressure range of the SF or SF / N mixed gas SF or SF / N mixed gas is M1-M2, then M1

[0036] Referring to Figure 2 and Figure 3 In particular, the pressurizing assembly 33 includes a pressurizing pipe 331, a pressurizing elastic pipe 332 located in the pressurizing pipe 331, and a pressurizing piece 333 provided on the pressurizing pipe 331. The pressurizing pipe 331 is fixed and communicated with the constant pressure container 32. The pressurizing elastic pipe 332 is a pipeline made of elastic material, such as a corrugated pipe, a rubber pipe or a silica gel pipe, and is in a compressed state and is limited in the pressurizing pipe 331 by the pressurizing piece 333. One end of the pressurizing elastic pipe 332 is fixed and communicated with the constant pressure container 32, and the other end of the pressurizing elastic pipe 332 is closed and fixed with a pressure seat 334. The pressure seat 334 is fixedly connected to the pressurizing end of the pressurizing piece 333, and is slidingly connected in the pressurizing pipe 331. A limiting structure 335 for limiting the sliding pressurization of the pressure seat 334 towards the constant pressure container 32 is fixed in the pressurizing pipe 331 by a bolt or is integrally formed. In the embodiment, the limiting structure 335 is a protrusion or a protruding ring. The pressure applied by the pressurizing piece 333 to the pressurizing elastic pipe 332 is L. The pressurizing piece 333 controls the axial expansion and contraction of the pressurizing elastic pipe 332 along the pressurizing pipe 331 to change the volume by elastic contraction or active expansion. The pressurizing piece 333 is a constant pressure spring or an air cylinder, and the trigger pressure of the air cylinder is L, preferably a constant pressure air cylinder.

[0037] In use, due to the pressure change in the tank 1, it is directly transmitted to the balancing air bag 31 through SF or SF / N mixed gas, and then relatively balanced to the plurality of pressurized elastic tubes 332 through the constant pressure container 32. Due to the transmission to the plurality of pressurized elastic tubes 332 and the increase in pressure, at this time, the passive or active contraction of the pressurizing member 333 can make the volume of the constant pressure container 32 larger, so that the balancing air bag 31 expands synchronously, keeping the pressure in the tank 1 within the working pressure range corresponding to SF or SF / N mixed gas. At the same time, compared with directly balancing the pressure through the elastic and inflated air bag, the existence of the plurality of pressurized elastic tubes 332 can significantly reduce the pressure peak of the pressure rise.

[0038] Referring to Figure 1 , Figure 2 and Figure 3 In addition, in order to avoid the temperature of the tank 1 from rising too much due to multiple pulse high-voltage discharges and further optimize the cleanliness of SF or SF / N mixed gas, the balancing air bag 31 or the tank 1 is connected with an extraction member 12 for extracting insulation gas. In this embodiment, the extraction member 12 is a control valve and is fixedly connected to the connecting flange pipe 10. At the same time, the tank 1 is provided with an input member 13 for replacing gas in the initial charging period of the discharge period, which is a gas pump connected to an external clean SF or SF / N mixed gas source. The output end of the input member 13 is fixedly connected to the inside of the tank 1 through a control valve, so that when the discharge period is long, the cleanliness of the SF or SF / N mixed gas in the small ball gap can be ensured by replacing the SF or SF / N mixed gas directly, and the initial pressure fluctuation is balanced through the balancing device 3. When the charge-discharge period is relatively short, the SF or SF / N mixed gas can also be directly replaced after a test period is completed through multiple charge-discharge, so as to avoid the influence of the SF or SF / N mixed gas mixed with decomposition impurities remaining in the tank 1 on the experimental results.

[0039] Referring to Figure 1 , Figure 2 and Figure 3In addition, if the charge and discharge cycle is relatively long, there will be replacement of SF or SF / N mixed gas, SF or SF / N mixed gas flow in the tank 1, therefore, the tank 1 is provided with a spoiler tube 14 made of insulating material, the spoiler tube 14 is fixed to the inner wall of the tank 1 by other insulating support 11, and the spoiler tube 14 and the tank 1 are preferably coaxially positioned, and the high-voltage generator 2 is located inside the spoiler tube 14, to reduce the space of SF or SF / N mixed gas flow around the high-voltage generator 2, and to limit the flow of SF or SF / N mixed gas inside and outside the spoiler tube 14 in the tank 1 after the volume change stops or the extraction piece 12 and the input piece 13 are closed, and because the high-voltage generator 2 has a relatively complex structure, it can further limit the flow of SF or SF / N mixed gas in the spoiler tube 14, so as to achieve the purpose of quickly reducing the flow speed of SF or SF / N mixed gas.

[0040] Referring to Figure 3 and Figure 4 At the same time, in order to further reduce the gas flow caused by SF or SF / N mixed gas replacement and pressure fluctuation after the volume change in the tank 1 stops or after the SF or SF / N mixed gas replacement stops, at least the spoiler tube 14 outside is provided with a limiting assembly 4 for limiting air flow.

[0041] Specifically, the limiting assembly 4 includes a limiting piece 41 and a control piece 42, the limiting piece 41 is arranged as several groups distributed along the axial direction of the spoiler tube 14, and several limiting pieces 41 in the same group are distributed around the central axis of the spoiler tube 14. In this embodiment, the limiting piece 41 is only arranged outside the spoiler tube 14, of course, in other embodiments, the limiting piece 41 can also be arranged inside the spoiler tube 14.

[0042] Referring to Figure 3 and Figure 4The outer side of the limiting piece 41 is rotationally connected to the inner wall of the tank body 1, and the rotation axis of the limiting piece 41 is preferably perpendicular to the central axis of the tank body 1, so that the limiting pieces 41 can be rotated to be parallel to the central axis of the tank body 1 and the central axis of the spoiler pipe 14, so as to form a larger space for air flow between adjacent limiting pieces 41, and the limiting pieces 41 can be rotated to be perpendicular to the central axis of the tank body 1, so as to be connected to each other, and the channel for air flow outside the spoiler pipe 14 in the tank body 1 is significantly reduced, which is used to limit air flow after ventilation, so that the air in the tank body 1 flows relatively quickly, and the discharge of the lightning impact simulation experiment is avoided. Disturbance. Specifically, the same group of several limiting pieces 41 are provided as six in this embodiment, and when the six limiting pieces 41 in the same group are parallel to each other, the inner side edge is tangent to the outer wall of the spoiler pipe 14 and the projection in the axial direction is a hexagon, preferably a regular hexagon. The control member 42 is provided and installed on the outer wall of the tank body 1 one by one in this embodiment.

[0043] Referring to Figure 3 and Figure 4 The control member 42 can be provided as a stepper motor, and the output shaft is fixedly connected to the limiting piece 41, and the output shaft of the control member 42 and the inner wall of the tank body 1 are sealed by a high-pressure sealing structure, or the rotor and the stator coil are located in independent sealed cavities, and the mechanical separation is realized by a non-magnetic isolation layer (such as stainless steel, ceramic or composite material). Brushless motor. Of course, in other embodiments, the control member 42 can also be provided as a rack slidingly arranged on the tank body 1, a cylinder or a hydraulic cylinder for driving the rack to slide, and a gear rotationally connected to the tank body 1 and connected to the limiting piece 41, and the gear is engaged with the rack to simultaneously realize the rotation control of the plurality of limiting pieces 41.

[0044] The implementation principle of the embodiment of the present application is: in use, the pressure change in the tank body 1 is directly transmitted to the balance air bag 31 through SF or SF / N mixed gas, and then relatively balanced to the plurality of pressurized elastic tubes 332 through the constant pressure container 32. Since the pressure is transmitted to the plurality of pressurized elastic tubes 332 and the pressure becomes larger, at this time, the passive or active contraction of the pressurizing piece 333 can make the volume of the constant pressure container 32 larger, so that the balance air bag 31 can be inflated synchronously, so as to relieve the pressure in the tank body 1 and keep the pressure in the tank body 1 within the working pressure range corresponding to SF or SF / N mixed gas. At the same time, compared with directly balancing the pressure through the air bag in the inflated state, the existence of the plurality of pressurized elastic tubes 332 can significantly reduce the resistance change of the inflation of the balance air bag 31, so as to reduce the pressure peak value of the pressure rise in the tank body 1 after discharge and during discharge. When discharging for many times or for a relatively long period, the cleanliness of SF or SF / N mixed gas in the tank body 1 can be further maintained through SF or SF / N mixed gas.

[0045] In addition, whether SF or SF / N mixed gas is replaced or not, there is a certain flow of SF or SF / N mixed gas in the tank body 1, and the flow of gas will cause the non-uniformity of the gap electric field between the small balls. Therefore, after the replacement of SF or SF / N mixed gas, the plurality of limiting sheets 41 in the same group are parallel and overlapped to each other, so as to significantly increase the resistance of the flow of SF or SF / N mixed gas outside the turbulence tube 14, so as to cooperate with the separation of the inside and outside of the turbulence tube 14, so that the flow speed of SF or SF / N mixed gas in the tank body 1 can be relatively fast and close to the static state, so as to significantly reduce the influence of the discharge caused by the gas replacement on the lightning impulse simulation experiment. When replacing SF or SF / N mixed gas, the limiting sheet 41 can be parallel to the turbulence tube 14, so as to reduce the interference to the flow of SF or SF / N mixed gas and avoid the situation that the gas containing the decomposition impurities of SF or SF / N mixed gas after discharge remains.

[0046] The above are the preferred embodiments of the present application, but not limit the protection scope of the present application, so: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A pneumatic lightning impulse high-voltage generator, characterized in that: Includes a tank (1), a high-pressure generator (2) installed in the tank (1) via an insulating support (11), and a balancing device (3) for ventilation and pressure balancing, wherein the high-pressure generator (2) is used for pulse charging and discharging toward the outside; The balancing device (3) includes a balancing airbag (31) connected to the inside of the tank (1) and in a contracted state, and a constant pressure container (32) disposed in the tank (1). The balancing airbag (31) is located inside the constant pressure container (32). The constant pressure container (32) is connected to a plurality of pressurizing components (33) that pressurize the constant pressure container (32) through volume elastic expansion and contraction. The volume expansion pressure of the balancing airbag (31) is greater than the preset pressure of the tank (1) and less than the peak pressure of the tank (1) after discharge.

2. The gas-filled lightning impulse high-voltage generator according to claim 1, characterized in that: The pressurizing assembly (33) includes a pressurizing tube (331) fixed to a constant pressure container (32), an elastic tube (332) fixed and connected inside the constant pressure container (32), and a pressurizing element (333) for axially compressing the pressurizing elastic tube (332) along the pressurizing tube (331). The pressurizing elastic tube (332) is coaxially arranged inside the pressurizing tube (331).

3. The pneumatic lightning impulse high-voltage generator according to claim 2, characterized in that: The end of the pressurized elastic tube (332) away from the constant pressure container (32) is fixed with a pressure seat (334) that is slidably disposed in the pressurized tube (331). The pressurized tube (331) is provided with a limiting structure (335) for limiting the pressure seat (334) from sliding towards the constant pressure container (32) for pressurization.

4. The pneumatic lightning impulse high-voltage generator according to claim 2, characterized in that: The pressure-applying component (333) is a constant-pressure spring or a cylinder.

5. The pneumatic lightning impulse high-voltage generator according to any one of claims 1-4, characterized in that: The balance airbag (31) or tank (1) is connected to an extraction component (12) for extracting insulating gas, and the tank (1) is provided with an input component (13) for replacing gas in conjunction with the extraction component (12) during the initial charging stage.

6. The pneumatic lightning impulse high-voltage generator according to any one of claims 1-5, characterized in that: The tank (1) is equipped with a baffle tube (14) made of insulating material, and the high-voltage generator (2) is located inside the baffle tube (14).

7. The pneumatic lightning impulse high-voltage generator according to claim 6, characterized in that: The bleed tube (14) is provided with a limiting component (4) at least on its outer side, the limiting component (4) being used at least to limit airflow after ventilation.

8. The pneumatic lightning impulse high-voltage generator according to claim 8, characterized in that: The limiting component (4) includes several sets of limiting plates (41) rotatably connected to the baffle tube (14) and control components (42) for controlling the rotation of the limiting plates (41). Several limiting plates (41) in the same set are arranged around the baffle tube (14).

9. The pneumatic lightning impulse high-voltage generator according to claim 8, characterized in that: The limiting pieces (41) in the same group are parallel to each other and their projections along the axial direction of the tank (1) form a ring.

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