Lightning protection insulator

Abstract

The invention relates to the technical field of power equipment, and discloses a lightning protection insulator, a support assembly is provided with a mounting part for placing a wire, the top end of a ceramic jacket is provided with the support assembly, the bottom end of the ceramic jacket is connected with a steel foot, the ceramic jacket is internally provided with a storage space, and a ventilation gap communicated with the outside is arranged between the steel foot and the ceramic jacket. The resistor assembly is arranged in the storage space, the side, facing the steel foot, of the resistor assembly is provided with an installation space, and one end of the installation space is open and faces the steel foot. The anti-explosion assembly is located between the resistor assembly and the steel foot and used for sealing the storage space. The triggering assembly comprises a first elastic piece and a triggering piece, the triggering piece is used for sealing the opening of the mounting space, the first elastic piece is elastically compressed and connected between the bottom wall of the mounting space and the triggering piece, and when the current pressure in the mounting space is larger than the preset pressure, the first elastic piece can break the triggering piece and drive the anti-explosion assembly to move downwards; therefore, the storage space is communicated with the ventilation gap, and the risk of explosion of the ceramic outer sleeve is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power equipment, and particularly relates to a lightning protection insulator. BACKGROUND

[0002] The 10kV lightning protection insulator in the prior art mainly adopts composite silicone rubber as an outer insulation material, which is prone to outer insulation aging failure in harsh environments such as coastal areas and plateaus, and thus is prone to causing outer insulation flashover accidents. In addition, the explosion-proof structure of the insulator in the traditional design has low integration with the appearance, and the explosion-proof function is often realized through an additional protection device, resulting in a bloated overall structure of the product, a proportion disorder, and poor lightning protection and explosion-proof effect. As can be seen from the above, the insulator in the prior art has poor safety, and still has the problems of poor lightning protection and explosion-proof performance. SUMMARY

[0003] The application aims to provide a lightning protection insulator, and solve the problems of poor safety and poor lightning protection and explosion-proof performance of the insulator in the prior art.

[0004] In the embodiment of the application, a lightning protection insulator is provided, which comprises: a support assembly having a mounting portion for accommodating a wire; a ceramic outer sleeve having the support assembly mounted at a top end and a steel leg connected at a bottom end, the ceramic outer sleeve having an accommodation space inside, and the steel leg and the ceramic outer sleeve having a ventilation gap in communication with the outside; a resistance assembly disposed in the accommodation space, the resistance assembly having a mounting space on a side facing the steel leg, and the mounting space being open at one end and facing the steel leg; an explosion-proof assembly located between the resistance assembly and the steel leg and used for sealing the accommodation space; a triggering assembly comprising a first elastic member and a triggering piece, the triggering piece being used for sealing the opening of the mounting space, and the first elastic member being elastically connected between a bottom wall of the mounting space and the triggering piece, when a current pressure in the mounting space is greater than a preset pressure, the first elastic member breaks through the triggering piece and drives the explosion-proof assembly to move, so that the accommodation space is in communication with the ventilation gap.

[0005] In the embodiment of the application, the ceramic outer sleeve further has a storage space inside in communication with the accommodation space, the accommodation space is coaxially arranged above the storage space, the inner diameter of the storage space is greater than that of the accommodation space, the storage space is in communication with the ventilation gap, and the explosion-proof assembly comprises a sealing plate disposed in the storage space, the two sides of the sealing plate along the length direction are in sealing fit with the inner wall of the storage space, and when the first elastic member breaks through the triggering piece, the first elastic member is used for driving the sealing plate to move.

[0006] In the embodiment of the present application, the explosion-proof assembly comprises a second elastic member, which is elastically connected between the steel leg and the bottom surface of the sealing plate along the length direction.

[0007] In the embodiment of the present application, the lightning protection insulator further comprises a sealing ring, the top of the groove of the storage space is further provided with an annular sealing groove, and the sealing ring is arranged in the annular sealing groove, and the sealing ring is used for sealing the gap between the sealing plate and the top of the groove of the storage space.

[0008] In the embodiment of the present application, the steel leg is further provided with a plurality of pressure release holes corresponding to the explosion-proof assembly, the pressure release holes are communicated with the outside and the storage space, and the plurality of pressure release holes are arranged in a circumferential direction around the axis of the steel leg.

[0009] In the embodiment of the present application, the side wall of the ceramic sleeve is provided with a plug-in hole communicated with the storage space, and the lightning protection insulator further comprises an external arc guiding member, the external arc guiding member comprises an arc guiding member and a lightning receiving part, the first end of the arc guiding member is connected with the lightning receiving part, the second end of the arc guiding member is sealedly penetrated through the plug-in hole and connected with the resistance assembly, and the lightning receiving part is used for receiving lightning conducted by the support assembly.

[0010] In the embodiment of the present application, the lightning protection insulator further comprises a locking member, the arc guiding member comprises a first mounting part arranged in parallel with the axis of the ceramic sleeve and a second mounting part inserted on the ceramic sleeve in a radial direction, the first mounting part and the second mounting part are integrally connected, and the locking member is sleeved on the second mounting part and used for locking the second mounting part and the ceramic sleeve.

[0011] In the embodiment of the present application, the support assembly comprises an arc guiding disc and a cover plate, the top end of the arc guiding disc is provided with a storage groove for placing a wire, and the bottom end of the arc guiding disc is used for locking the cover plate on the ceramic sleeve, and a lightning receiving gap is left between the cover plate and the lightning receiving part.

[0012] In the embodiment of the present application, the cover plate comprises a flat part in contact with the arc guiding disc and an inclined part arranged around the flat part, and the inclined part is arranged downwardly inclined from the flat part to the direction close to the lightning receiving part.

[0013] In the embodiment of the present application, the resistance assembly comprises a resistance sheet and lead electrodes connected to both ends of the resistance sheet along the length direction, the outer peripheral walls of the resistance sheet and the lead electrodes are wrapped with a potting glue, the lead electrode located at the top end of the resistance sheet is provided with a plug-in hole, and the arc guiding member is plugged into the plug-in hole and the plug-in hole is threadedly matched.

[0014] Through the above technical scheme, the lightning protection insulator provided by the embodiment of the present application has the following beneficial effects: The lightning protection insulator of the present application comprises a support assembly, a ceramic outer sleeve, a resistance assembly, an explosion-proof assembly and a triggering assembly. The support assembly has a mounting portion for accommodating a wire. The top end of the ceramic outer sleeve is provided with the support assembly, and the bottom end is connected with a steel foot. The ceramic outer sleeve has an accommodation space inside. The steel foot and the ceramic outer sleeve have a ventilation gap in communication with the outside. The resistance assembly is arranged in the accommodation space. The side of the resistance assembly facing the steel foot has a mounting space. One end of the mounting space is provided with an opening and faces the steel foot. The explosion-proof assembly is arranged between the resistance assembly and the steel foot and is used for sealing the accommodation space. The triggering assembly comprises a first elastic member and a triggering piece. The triggering piece is used for sealing the opening of the mounting space. The first elastic member is elastically compressed and connected between the bottom wall of the mounting space and the triggering piece. When the current pressure in the mounting space is greater than the preset pressure, the first elastic member can break the triggering piece and drive the explosion-proof assembly to move downward, so that the accommodation space is in communication with the ventilation gap. The pressure in the accommodation space can be discharged to the outside space through the ventilation gap, thereby reducing the risk of explosion of the ceramic outer sleeve. The problems of poor safety, poor lightning protection and explosion-proof performance of the insulator in the prior art are solved.

[0015] Other features and advantages of the present application will be described in detail in the following detailed description of the application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. Other embodiments of the application, upon which the drawings can be based, can be obtained from those illustrated structures without paying creative labor. In the drawings: Figure 1 is a structural schematic diagram of the lightning protection insulator according to the present application; Figure 2 is a sectional schematic diagram of the lightning protection insulator according to the present application.

[0017] Explanation of reference signs DETAILED DESCRIPTION

[0018] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0019] The lightning protection insulator according to the present application will be described below with reference to the accompanying drawings.

[0020] As Figure 1 and Figure 2As shown, in the embodiment, the lightning protection insulator of the application comprises a support assembly, a ceramic outer sleeve 2, a resistance assembly, an explosion-proof assembly and a triggering assembly, the support assembly has a mounting portion for accommodating a conductor, the support assembly is mounted at the top end of the ceramic outer sleeve 2, the bottom end is connected with a steel foot 3, the ceramic outer sleeve 2 has an accommodation space 21 inside, the steel foot 3 and the ceramic outer sleeve 2 have a ventilation gap in communication with the outside, the resistance assembly is arranged in the accommodation space 21, and the side of the resistance assembly facing the steel foot 3 has a mounting space, one end of the mounting space is provided with an opening and faces the steel foot 3. The explosion-proof assembly is located between the resistance assembly and the steel foot 3 and is used for sealing the accommodation space 21. The triggering assembly comprises a first elastic member 61 and a triggering piece, the triggering piece is used for sealing the opening of the mounting space, and the first elastic member 61 is elastically compressed and connected between the bottom wall of the mounting space and the triggering piece. When the current pressure in the mounting space is greater than the preset pressure, the first elastic member 61 can break the triggering piece and drive the explosion-proof assembly to move, so that the accommodation space 21 is in communication with the ventilation gap, the pressure in the accommodation space 21 can be discharged to the outside space through the ventilation gap, thereby reducing the risk of explosion of the ceramic outer sleeve 2, and solving the problems of poor safety of the insulator, poor lightning protection and explosion-proof performance in the prior art.

[0021] In the application, the main body ceramic outer sleeve 2 of the insulator is made of ceramic. Compared with the traditional composite silicone rubber outer insulation material, the ceramic material has better salt mist resistance, ultraviolet resistance and high and low temperature aging resistance, can cope with the problem of outer insulation aging failure in harsh environments such as coastal areas and highlands, and can prevent external insulation flashover accidents. Further, the ceramic outer sleeve 2 can be made of high-hardness alumina ceramic material, the content of alumina is not less than 95%, the bulk density is ≥3.6 g / cm3, the bending strength is ≥300 MPa, and the dielectric loss tangent (25℃, 50Hz) is ≤0.0005. The main function of the ceramic outer sleeve 2 is to provide excellent outer insulation performance, mechanical strength and environmental aging resistance to resist the erosion of salt mist, ultraviolet rays and dust in the external environment.

[0022] To improve the anti-fouling performance, a plurality of corrugated umbrella skirt structures are arranged on the surface of the ceramic outer sleeve 2 along the height direction, preferably, the umbrella skirt design follows the following principles: the umbrella skirt diameter is 120-150 mm, the umbrella skirt spacing is 30-40 mm, the umbrella skirt edge curvature radius is ≥5 mm, and 3-5 large umbrella skirts and 2-3 small umbrella skirts are alternately arranged, the creepage distance is increased to not less than 400 mm, and the anti-fouling requirement under the condition of grade III pollution is met.

[0023] As Figure 2As shown, in this embodiment, the ceramic jacket 2 also has a storage space 22 communicating with the storage space 21 inside. The storage space 21 is located above the storage space 22 and is arranged coaxially. The inner diameter of the storage space 22 is larger than the inner diameter of the storage space 21, which facilitates the placement of the sealing plate 51 and prevents the sealing plate 51 from falling into the storage space 21. The storage space 22 is connected to the ventilation gap. The explosion-proof component includes a sealing plate 51 placed in the storage space 22. The two sides of the sealing plate 51 along the length direction are sealed to the inner wall of the storage space 22. When the first elastic element 61 breaks through the trigger piece, the first elastic element 61 is used to drive the sealing plate 51 to move, so as to release the pressure of the storage space 21 to the external space through the ventilation gap.

[0024] Under normal conditions, the sealing plate 51 seals against the inner wall of the storage space 22 on both sides along its length to prevent the storage space 21 from communicating with the external space. However, when the current pressure within the installation space exceeds a preset pressure, an abnormal state occurs. In this case, the first elastic element 61 breaks the trigger plate, relaxes, and applies a downward force to the sealing plate 51, pushing it downward until the storage space 21 communicates with the vent gap. The pressure within the storage space 21 can then be released to the external space through the vent gap, reducing the risk of the ceramic jacket 2 exploding. Preferably, the sealing plate 51 is made of a material such as nitrile rubber with a hardness of 60-70 Shore A and a thickness of 3-5 mm. The trigger plate is made of aluminum foil with a thickness of 0.1-0.2 mm. When the pressure inside the installation space exceeds a set value (0.5-0.8 MPa), the pressure pushes the first elastic element 61 to move, causing the trigger plate to break. The pressure within the storage space 21 is then quickly released through the vent gap, preventing the ceramic jacket 2 from exploding due to excessive pressure.

[0025] like Figure 2 As shown, in this embodiment, the explosion-proof component includes a second elastic element 52, whose two ends along its length are elastically connected between the steel foot 3 and the bottom surface of the sealing plate 51. The second elastic element 52 also possesses elastic compressive force. During the downward movement of the sealing plate 51 under impact, the second elastic element 52 is compressed under pressure and has an upward elastic restoring force, which can reduce the impact of the sealing plate 51 on the steel foot 3 and effectively support the sealing plate 51. It should be noted that both the first elastic element 61 and the second elastic element 52 are springs in the prior art. Preferably, the spring stiffness is 5-10 N / mm, and the pre-compression is 2-3 mm.

[0026] like Figure 2As shown, in the embodiment, the lightning protection insulator further comprises a sealing ring, the groove top of the storage space 22 is further provided with an annular sealing groove 23, and the sealing ring is arranged in the annular sealing groove 23. The sealing ring is used for sealing the gap between the storage space 22 and the groove top of the sealing plate 51, so as to further improve the sealing effect of the sealing plate 51 and avoid that external gas enters the storage space 21 to corrode the resistance sheet 41.

[0027] As shown in the drawings, Figure 2 As shown, in the embodiment, the steel leg 3 is further provided with a plurality of pressure release holes 7 corresponding to the explosion-proof assembly, the pressure release holes 7 are communicated with the outside and the storage space 22, and the plurality of pressure release holes 7 are arranged in a circumferential direction around the axis of the steel leg 3. Since the pressure release holes 7 always communicate the storage space 22 with the outside, the pressure release holes 7 can also play an auxiliary pressure relief role, thereby further reducing the explosion risk of the ceramic outer sleeve 2. The number of the pressure release holes 7 can be adjusted according to actual needs.

[0028] As shown in the drawings, Figure 2 As shown, in the embodiment, the side wall of the ceramic outer sleeve 2 is provided with a plug-in hole communicated with the storage space 21, and the lightning protection insulator further comprises an external arc striking member 8. The external arc striking member 8 comprises an arc striking member and a lightning receiving part 82. The first end of the arc striking member is connected with the lightning receiving part 82, and the second end is sealed and penetrates through the plug-in hole and is connected with the resistance assembly. The lightning receiving part 82 is used for receiving the lightning conducted by the support assembly. Specifically, the lightning receiving part 82 is used for receiving the lightning current conducted from the cover plate 12 and guiding the lightning current to the resistance assembly. The setting of the external arc striking member 8 can effectively play a role in conducting the lightning current, and the lightning current is conducted to the resistance assembly, so as to avoid that the lightning current burns and damages the ceramic outer sleeve 2.

[0029] Taking the conductor of a 10kV distribution network line as an example, when the distribution network line is in normal operation, the ceramic outer sleeve 2 and the resistance assembly together provide excellent external insulation performance, so as to ensure that the insulator can withstand a 10kV rated voltage. The discharge gap between the cover plate 12 and the lightning receiving part 82 is in an insulating state, and no current passes through, so as to avoid the breakdown of the resistance assembly. The resistance sheet 41 is also in a high resistance state because the voltage at both ends does not reach its operating voltage, and only a small leakage current exists, which does not affect the normal power supply of the distribution network line.

[0030] When the conductor of the 10kV distribution line is struck by lightning, the overvoltage generated on the conductor first acts on the discharge gap between the cover plate 12 and the lightning rod 82. When the overvoltage reaches the breakdown voltage of the discharge gap, the discharge gap is rapidly broken down to form a conductive channel. The lightning current is conducted to the resistance assembly through the cover plate 12 and the discharge gap, and the pressure generated is finally discharged from the vent gap. In this process, the resistance sheet 41 exhibits its nonlinear characteristic and presents a low resistance state when the lightning current passes through, limiting the overvoltage generated by the lightning current within a safe range (residual voltage ratio ≤ 1.8) to avoid damage to the line equipment by overvoltage. At the same time, the zinc oxide resistance sheet 41 can quickly extinguish the power frequency continuous current after the lightning current, preventing the arc from continuing to burn and causing damage to the insulator. The arc-shaped structure of the external arc guide 8 guides the arc away from the insulator body, avoiding the arc burning the ceramic sleeve 2 and protecting the external insulation structure.

[0031] As shown in Figure 2 In this embodiment, the lightning protection insulator further includes a locking member 9, and the arc guide includes a first mounting portion 811 arranged parallel to the axis of the ceramic sleeve 2 and a second mounting portion 812 inserted radially into the ceramic sleeve 2, the first mounting portion 811 and the second mounting portion 812 are integrally connected, and the locking member 9 is sleeved on the second mounting portion 812 and used to lock the second mounting portion 812 and the ceramic sleeve 2.

[0032] As shown in Figure 2 In this embodiment, the support assembly includes the arc guide disc 11 and the cover plate 12, the top end of the arc guide disc 11 has a storage groove for accommodating the conductor, and the bottom end of the arc guide disc 11 is used to lock the cover plate 12 to the ceramic sleeve 2, and a lightning rod gap is left between the cover plate 12 and the lightning rod 82. Specifically, the top end of the ceramic sleeve 2 has a mounting groove, the inner wall of the mounting groove has an internal thread, the bottom end of the arc guide disc 11 has an external thread matching the internal thread, and the arc guide disc 11 is threadedly fitted with the ceramic sleeve 2 to stably lock the cover plate 12 to the top end of the ceramic sleeve 2. Wherein, the external arc guide 8 and the support assembly are made of stainless steel.

[0033] As shown in Figure 2 In this embodiment, the cover plate 12 includes a flat portion 121 in contact with the arc guide disc 11 and an inclined portion 122 arranged around the flat portion 121, the inclined portion 122 is arranged downwardly inclined from the flat portion 121 towards the lightning rod 82. Preferably, the discharge gap distance between the inclined portion 122 of the cover plate 12 and the lightning rod 82 is 55-58cm, which is optimized to ensure that the voltage value of 50% positive polarity lightning impulse discharge is broken down within 100kV required by the standard, while maintaining an insulating state under normal operating voltage.

[0034] As shown in Figure 2As shown, in the present embodiment, the resistance assembly comprises a resistance sheet 41 and lead electrodes 42 connected to the two ends of the resistance sheet 41 along the length direction, respectively, and the outer walls of the resistance sheet 41 and the lead electrodes 42 are wrapped with potting glue, a plug-in hole is formed on the lead electrode 42 at the top end of the resistance sheet 41, and the plug-in hole is plugged with the arc leading piece and is threadedly adapted to ensure that the resistance assembly can be stably connected to the arc leading piece. Among them, the outer wall of the resistance sheet 41 is also provided with a core sleeve made of Duridon or epoxy tube material, and preferably, the thickness of the core sleeve is 5-8mm.

[0035] In addition, the potting glue can be an epoxy resin potting glue, and further can be a two-component (A component and B component) epoxy resin potting glue, the mixing ratio (A:B) is 10:1 (mass ratio), and the viscosity (25℃) before curing is 500-800mPa s, which is convenient for pouring. The volume resistivity (25℃) after curing is ≥1×10 15 Ω cm, the dielectric loss tangent (25℃, 50Hz) is ≤0.005, the breakdown strength is ≥25kV / mm, the thermal conductivity is ≥0.3W / (m K), the temperature resistance range is -40℃ to 120℃, which can effectively isolate moisture and impurities during the operation of the lightning protection insulator, and can effectively absorb the heat and mechanical vibration generated by the zinc oxide resistance sheet 41 during the flow process, relieve the impact energy of the resistance assembly inside the placement space 21 when the resistance assembly fails, and at the same time improve the insulation performance of the outer surface of the zinc oxide resistance sheet 41 and reduce the probability of side flashover.

[0036] Specifically, the resistance sheet 41 can be a zinc oxide resistance sheet with a diameter of 48 (±0.5) mm and a height of 30 (±0.5) mm, and the zinc oxide resistance sheet has a flow capacity (4 / 10μs impact current) ≥120kA at a 10kV voltage level, a non-linear coefficient α (voltage ratio at 1mA and 10mA current) ≥30, a leakage current ≤10μA at a direct current 1mA reference voltage, a residual voltage ratio (ratio of impact residual voltage to rated voltage) ≤1.8 after 100kA impact current, a residual voltage change rate not exceeding 5%, and no damage such as breakdown and cracking.

[0037] In the description of the present application, it should be understood that the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0038] In this application, unless otherwise clearly indicated and limited, the terms "mounting", "connection", "connecting", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0039] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0040] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A lightning protection insulator, characterized by, The lightning protection insulator comprises: a support assembly having a mounting portion for accommodating a wire; a ceramic outer sleeve (2) having the support assembly mounted at a top end and a steel foot (3) connected at a bottom end, the ceramic outer sleeve (2) having an accommodation space (21) inside, and the steel foot (3) and the ceramic outer sleeve (2) having a ventilation gap communicating with the outside; a resistance assembly arranged in the accommodation space (21), the resistance assembly having a mounting space on a side facing the steel foot (3), and the mounting space being open at one end and facing the steel foot (3); an explosion-proof assembly arranged between the resistance assembly and the steel foot (3) and used for sealing the accommodation space (21); a triggering assembly comprising a first elastic member (61) and a triggering piece, the triggering piece being used for sealing the opening of the mounting space, and the first elastic member (61) being elastically compressed and connected between a bottom wall of the mounting space and the triggering piece, when a current pressure in the mounting space is greater than a preset pressure, the first elastic member (61) breaks the triggering piece and drives the explosion-proof assembly to move, so that the accommodation space (21) communicates with the ventilation gap.

2. The lightning protection insulator according to claim 1, characterized in that The ceramic outer sleeve (2) further has a storage space (22) communicating with the accommodation space (21) inside, the accommodation space (21) is coaxially arranged above the storage space (22), the inner diameter of the storage space (22) is greater than that of the accommodation space (21), the storage space (22) communicates with the ventilation gap, and the explosion-proof assembly comprises a sealing plate (51) arranged in the storage space (22), the sealing plate (51) is sealingly matched with the inner wall of the storage space (22) on both sides in the length direction, and when the first elastic member (61) breaks the triggering piece, the first elastic member (61) is used to drive the sealing plate (51) to move.

3. The lightning protection insulator according to claim 2, characterized in that The explosion-proof assembly comprises a second elastic member (52) elastically connected between the steel foot (3) and the bottom surface of the sealing plate (51) on both ends in the length direction.

4. The lightning protection insulator according to claim 2, wherein The lightning protection insulator further comprises a sealing ring, an annular sealing groove (23) is further formed in the top of the storage space (22), the sealing ring is arranged in the annular sealing groove (23), and the sealing ring is used to seal the gap between the sealing plate (51) and the top of the storage space (22).

5. The lightning protection insulator according to claim 2, wherein The steel foot (3) further has a plurality of pressure release holes (7) corresponding to the explosion-proof assembly, the pressure release holes (7) communicate with the outside and the storage space (22), and the plurality of pressure release holes (7) are arranged in a circumferential direction around the axis of the steel foot (3).

6. The lightning protection insulator according to claim 1, wherein The side wall of the ceramic outer sleeve (2) has a plug-in hole communicating with the accommodation space (21), and the lightning protection insulator further comprises an external arc leading member (8), the external arc leading member (8) comprises an arc leading member and a lightning arresting portion (82), a first end of the arc leading member is connected to the lightning arresting portion (82), a second end of the arc leading member is sealingly penetrated through the plug-in hole and connected to the resistance assembly, and the lightning arresting portion (82) is used to receive lightning conducted by the support assembly.

7. The lightning protection insulator according to claim 6, characterized in that The lightning protection insulator further comprises a locking member (9), the arc striking member comprises a first mounting portion (811) arranged in parallel with the axis of the ceramic outer sleeve (2) and a second mounting portion (812) inserted into the ceramic outer sleeve (2) in a radial direction, the first mounting portion (811) and the second mounting portion (812) are integrally connected, the locking member (9) is sleeved on the second mounting portion (812) and used for locking the second mounting portion (812) and the ceramic outer sleeve (2).

8. The lightning protection insulator according to claim 6, characterized in that The support assembly comprises an arc striking disc (11) and a cover plate (12), the top end of the arc striking disc (11) is provided with a storage groove for accommodating the wire, and the bottom end of the arc striking disc (11) is used for locking the cover plate (12) on the ceramic outer sleeve (2), and a lightning gap is left between the cover plate (12) and the lightning arresting portion (82).

9. The lightning protection insulator according to claim 8, characterized in that The cover plate (12) comprises a flat portion (121) in contact with the arc striking disc (11) and an inclined portion (122) arranged around the flat portion (121), and the inclined portion (122) is arranged to be inclined downward from the flat portion (121) to the direction close to the lightning arresting portion (82).

10. The lightning protection insulator according to claim 6, wherein The resistance assembly comprises a resistance sheet (41) and lead electrodes (42) respectively connected to both ends of the resistance sheet (41) in the length direction, the outer peripheral walls of the resistance sheet (41) and the lead electrodes (42) are wrapped with potting glue, the lead electrode (42) located at the top end of the resistance sheet (41) is provided with a plug-in hole, the arc striking member is inserted into the plug-in hole and the plug-in hole is threadedly adapted.

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